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What's in the Simulator 15 Patch?
Select one of the following links
to view descriptions of the changes incorporated via the PowerWorld Simulator
Patch files
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View Change Descriptions by Date:
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View All New Features/Improvements by Topic:
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View All Bug Fixes by Topic:
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Top
New Features
- File Formats: When using the Present
Topological Differences from Base Case tool,
added the ability to save the removed elements
in the EPC file format using status values of
-4.
- Oneline Diagrams: When using a
contour with a dynamic interpretation, if all
the values being contoured had the same value
the contour image could appear random. This was
remedied by enforcing a minimum tolerance on the
separation between minimum, nominal, and maximum
values of the color map.
- Transient Stability: Modified storage
to RAM to automatically include any information
needed for a subplot's horizontal axis data.
- User Interface Dialogs: Added ability
to assign Case Comments to a case which
designate a person's name and a time along with
the comment. These are only stored in the PWB
file format.
Bug Fixes
- Fault Analysis: Fixed error with the
handling of out-of-service switched shunt when
using the IEC-909 fault calculation
- Oneline Diagrams: On the contour
dialog, the choice of interpretation was not
being saved properly to a PWD file. Thus when
the diagram was reopened the choice was not
retained. This has been fixed.
- Power Flow Solution: Fixed error in
handling of phase shifters in the DC
approximation solution.
- QV Curve Tool: Removed irrelevant
message dialog when saving QV results to an AUX
file. This occurred for QV curves involving a
contingency which could not be solved.
- Time Step Simulation: Fixed problem
when pasting injection group data from Excel
into time step simulation input.
- Transient Stability: Modified storage
of Transient Contingencies to an AUX file to
properly use number identifiers when
appropriate.
- Transient Stability: Fixed error in
initializing the SMIB calculation to properly
handle a generator that was de-energized.
- Transient Stability: When storing
data to Hard-Drive while using the Integrated
Topology Processing, information is now stored
using the full-topology bus number identifiers
so that they can be properly read back in.
- Transient Stability: Fixed error in
handling of Generic Limit Monitors looking at
over frequency for synchronous generators.
The action to take was not being properly
interpreted.
- User Interface Dialogs: Fixed
multi-section line dialog bug. The Find From Bus
button did not work when inserting a new MS
Line.
Return to
Date List
New Features
Bug Fixes
- Help: Added help files and block diagrams to
the PowerWorld documents download page
here.
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Date List
New Features
- PV Curve Tool: With the PV tool added
the options to interpolate inadequate voltages
and to always report the minimum voltage when
monitoring low limit violations even if no
limits are violated.
Bug Fixes
- Time Step Simulation: Fixed bug with
deleting columns from injection group inputs.
- Time Step Simulation: Fixed problem
with scaling load with injection group inputs.
- Time Step Simulation: Fixed ability
to defined load fields as part of result
tracking.
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Date List
New Features
- Case Information Displays: Added
ability to use other object type filters with
the GenVarLim object.
- File Formats: When loading the
hdbexport file, modified to automatically add
two labels to each transmission line. One label
starts with the "from" substation name and the
other label starts with the "to" substation
name.
- Transient Stability: Added support
for storing interface MW, Mvar, and MVA flows as
part of the transient stability results.
- Transient Stability: Added ability to
show the number of elements in a Transient
Contingency.
- Transient Stability: Modified the
Transient Contingency Element Dialog to show the
filter information for choosing the object by
default.
Bug Fixes
- Contingency Analysis: Fixed bug that
would prevent creating the following object
types from an Auxiliary File or by copy/paste
from a spreadsheet: ContingencyElement,
CTGElementBlockElement,
GlobalContingencyActionsElement,
PostPowerFlowActionsElement.
- Oneline Diagrams: Fixed flashing hint
windows caused by interaction between navigation
arrows and oneline hints.
- Transient Stability: Fixed bug with
writing TSR files. The bug was introduced in
July 2 patch.
- Transient Stability: Some problems
with access violations when running stability
were encountered related to the plot designer.
These should be fixed now.
- Transient Stability: When
auto-correcting the Xl value for a GENSAL,
GENROU, or other synchronous machine model, the
informational message had a typo indicating it
was changing Xqp. This typo has been fixed.
- Transient Stability: The
auto-correction routine was not allowing the
Linc value of a GAST_GE model to be near zero.
This restriction has been removed.
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Date List
New Features
- Auxiliary File: Added new script
command "AutoInsertTieLineTransactions" which
takes now parameters. This deletes all existing
MW transactions and set the unspecified MW
interchange for each area to zero. It then
automatically creates a MW transaction between
each pair of connected areas with a MW
transaction exactly equal to the sum of the
tie-line flows.
- File Formats: Modified the writing of
PTI RAW files so that switched shunt records
always write out at least one block. If none
exists, a single block with 1 step and size
equal to the present MVar output is written.
- File Formats: Modified the writing of
GE EPC file so that Multi-Terminal DC converters
will write out the "aloss" parameter in a manner
consistent with how the EPCL file mtTAP.p
expects to ensure the EPCL operates appropriate
for WECC data files.
- User Interface Dialogs: On the
Present Topological Differences from Base Case
dialog, the various case information displays of
removed elements have been modified to provide a
mechanism to right-click on a selection and
choose to Save Selected to EPC file.
Bug Fixes
- File Formats: When saving any file,
Simulator was prompting the user about adding a
comment to the file. This will now only be done
when saving to the most recent PWB file format.
- Power Flow Solution: Fixed error
caused when a MTDC Converter ended up with a
current flow of exactly 0.0 amps. This resulted
in a number being equal to 0/0 which resulted in
a "NAN" result causing the power flow to fail.
- User Interface Dialogs: Fixed error
in feature to remove additional GE EPC data from
the case.
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Date List
New Features
- Oneline Diagrams: Added a Simulator
Oneline option that alter how Simulator responds
when click on a circuit breaker symbol for a
generator display object. Normally the
generator's status is set to closed and the MW
value is reset to its previous value. The new
option allows the value to be set to its minimum
MW output instead.
- Transient Stability: Modified the
Generator and Load dialogs to be sizeable when
on the Transient Stability Tab.
- Transient Stability: Modified the
Plot Designer portion of the dialog to have
scroll bars
- Transient Stability: Added the
ability to add to a Plot a Title Block including
an image logo, text, and a date.
- Transient Stability: Added ability to
copy to clipboard or print a plot including the
Title Block and multiple subplots.
- Transient Stability: Added ability to
close all open plots from the local menu of a
plot and from a button on the Transient
Stability dialog.
- Transient Stability: Modified GENCC
generators to require an Xcomp value which is
negative.
- Transient Stability: Modified the
loading of GE DYD files to also accept a file
extension of "DYC". When loading a DYC file no
prompt will appear asking about deleting
existing stability models. The assumption is
that it will append to existing models.
Bug Fixes
- File Formats: When appending a case
using a RAW or an EPC file, set the area and
zone numbers for loads. Previously these were
not updated when appending.
- File Formats: Fixed error that would
occur if choosing to save out an EPC file and
then hitting cancel.
- QV Curves: Added more error handling
when saving the tracking results file in the QV
curve. This should help prevent process failures
when the file network location is unavailable.
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Date List
New Features
- Sensitivity Calculations: Greatly
increased the speed of calculating multiple
element TLR sensitivities.
Bug Fixes
- Auxiliary File Format: Fixed access
violation caused when calling MergeLineTerminals()
with no branches actually meeting the filter.
This will now simply do nothing instead.
- File Formats: Fixed potential error
when reading an PTI *.seq file for sequence
data. It was possible for the transformer zero
sequence impedance to not properly read from
this file.
- PV Curve Tool: Fixed problem with
plotting base case values on the horizontal
axis. Need to determine plot points based on a
common nominal shift and can't assume that there
will be the same number of points in a scenario
and the base case results.
- Oneline Diagrams: Fixed error with
anchoring of transmission line objects after
saving some oneline diagrams.
- Transient Stability: Fixed error when
plotting either 7 or 10 subplots on a single
plot. The subplots were not laid out properly.
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Date List
New Features
- Auxiliary Script: When using the
MergeLineTerminals() script command, we now send
a message to the log if no lines are actually
selected for merging.
- QV Curves: When exporting QV results
to a CSV file, all results are now sorted by the
voltage setpoint.
- Transient Stability: When loading in
synchronous machine saturation values specified
at 1.0 and 1.2 per unit, if S(1.2) < S(1.0) then
Simulator will flip the values to autocorrect.
Bug Fixes
- File Formats: When writing out the
internal generator R and X values to a RAW file,
an old limitation existed preventing values
larger than 999. This limitation has been
removed.
- File Formats: When loading text
files, modified to treat TAB characters
identically to SPACE characters.
- File Formats: When appending to a
case (from an EPC, RAW, or PWB file) if the From
and To designations of a branch are backwards in
the appending file, then the designations will
now be flipped as part of the appending
processes.
- Oneline Diagrams: Changed the icon
size for the end of transmission lines to be
smaller when exporting to a KML file.
- Power Flow Solution: When calculating
the flow on a branch after solving a DC power
flow, the contribution of MW Line Shunts was not
properly handled. The actually DC power flow
solution was correct, but the line flow would
not be correct. This has been fixed.
- Sensitivities: Fixed bug in the LODF
calculations introduced in the July 23 patch.
- Time Step Simulation: Fixed bug with
writing out injection group CSV files that would
add the date and time to the file twice. This
would also have affected the switched shunt CSV
files.
- Time Step Simulation: Added scroll
box around options on the Time Step Simulation
dialog.
- Transient Stability: Fixed a bug
where trying to show a plot at the execution of
transient stability. The plots were shown but
never properly refreshed.
- Transient Stability: Modified so that
the generator internal R and X values are always
updated to match the generator subtransient or
transient impedances as appropriate. This is
done when the stability is either solved or when
the stability data is loaded or stored. These
fields must match and the stability data
exported to other software must reflect the fact
that Simulator always uses the data specified
with machine models.
- Transient Stability: Fixed a bug in
how the saturation of GENROU and GENSAE models
was handled.
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Date List
New Features
- Auxiliary Files: Added a new script command "InjectionGroupsAutoInsert;". This passes no parameters. The options for this command can be set by populating the object "IG_AutoInsert_Options" appropriately. The settings available with this object represent what is seen on the Auto Insert Injection Groups Dialog.
- Available Transfer Capability: Optimized the code for the calculate of ATC values to pre-calculate the Line Outage/Insertion sensitivities prior to running the ATC. This increased the speed of the single linear step ATC method by about a factor of 2. Increases the total speed of the iterated methods by about a factor of 3.
- Case Information Displays: Add ability to define "Custom String Expressions" which represent the concatenation of strings from the columns of an object. Included in the was a new function available in the expression string with format "Str(x1, minlength, decimals)" where x1 represents a numeric variable, minlength represents the minimum number of characters for the result, and decimals represents the number of characters to the right of the decimal point.
- File Formats: When reading from an EPC file, added the reading of the area and zone designation of a GE branch and transformer. This will not be stored in the PWB file format for now but will be added to Version 16's format.
- Oneline Diagrams: When changing to a Saved View which specifies that a contour be shown, we now automatically refresh the contour image.
- User Interface: On the Auto-Insert Injection Groups Dialog, add an option to name an injection group by a specific name. This will only be used if only ONE injection group ends up being created based on the other options. The intent is to use this in conjunction with the new scrip command "InjectionGroupsAutoInsert;".
- Transient Stability: When writing out DYD files, we now always write out the model names in lower case characters.
- Transient Stability: When write out two bus equivalent models from the SMIB portion of the dialog, generators are now automatically set to AVR = NO.
- Transient Stability: Modified to automatically refresh any open plots when performing the interval check while running transient stability. Previously it would only refresh plots if the option was set to "Transfer Results to Power Flow after Interval Check"
- Transient Stability: Modified the user interface throughout Simulator to not allow editing of the power system data when you've transferred the transient stability state over to the power flow. Case Information displays will appear yellowed and editing on most power system model dialogs will not be allowed.
- Transient Stability: Added ability to open only one end of a transmission branch.
- Transient Stability: Fixed bug when using the default (done by specifying a negative gv1 value) non-linear steam gate function for the IEEEG1 governor.
Bug Fixes
- Contingency Analysis: Fixed a potential error that could occur if PostCheck contingency actions were used in combination with the "Solve Power Flow" contingency action.
- Contingency Analysis: When specifying a Post-Contingency AUX file which does not exist on your computer, Simulator is supposed to show a dialog telling you this and then abort the contingency simulation. This was not working properly and error was appearing saying "Cannot focus a disable or invisible window.". This error has been fixed.
- File Formats: When writing out the DC converters for a multi-terminal line to an EPC file, Simulator write out modes of 0, 4, or 5 if the multi-terminal DC line had only 2 converters (similar to what is done for the Two-Terminal DC lines). This was reported as causing problem when reading into GE, so we now will write only 1, 2, or 3 instead.
- Oneline Diagram: When switching to a Saved View which specified that no contour should be shown, the contour was not properly removed. This has been fixed.
- Transient Stability: Modified to better handle the saturation of the GENTPF and GENTPJ generator models
- User Interface: Removed old options to "automatically open overheated lines during simulation".
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Date List
New Features
- QV Curves: Added the ability to plot multiple QV curves on the same plot.
Bug Fixes
- Distributed Computation: Continued stability improvements for the distributed computation add-ons.
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Date List
New Features
- PV Curve Tool: The more flexible plotting environment available in Transient Stability has been integrated into the PV Curve tool. This is available under "New Plots" on the PV Curve dialog. Note that this is available in addition to the previous plotting tool.
- Transient Stability: For the IEEEG1 governor model, the following two relationship must be true. K1+K3+K5+K7=1 and K2+K4+K6+K8=1. If they are not true, Simulator will now normalize the values to enforce these equalities.
- Transient Stability: When choosing to show a transient stability plot on the execution of the stability run, the simulation will now automatically update the plots with appropriate data after each interval check. Previously the user would also have to specify this update if they want the plots to actually show data.
Bug Fixes
- Available Transfer Capability: Corrected loading in transfer limiters from an aux file when they are processed for only a single run and not for multiple scenarios.
- Power Flow Solution: Fixed improper handling of magnetizing conductance in some locations when using the DC power flow approximation.
- Transient Stability: Fixed an incorrect choice in the choices appear in the Toggle Drop-Down for generator objects's Governor Response Limits.
- Transient Stability: Fixed typo for the column heading which mixed up the K1 and K2 parameters for the IEE2ST stabilizer.
- Transient Stability: Fixed the running of multiple transient contingencies to obey the SKIP field of a transient contingency. Previously we were always running all the transient contingencies. It will now skip them as specified.
- Transient Stability: For some generators there were hard limits on the value of H, D, Tdo, Tdop, and the Saturation values. These limits previously were auto-corrected but have been changed to leave the values and only create a warning.
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Date List
New Features
- Oneline Diagrams: Added ability to export a oneline diagram as a GIF image.
- Oneline Diagrams: Added ability to export a oneline diagram as an animated GIF image (animated the arrows and generator rotors).
- Transient Stability: Added toolbars to the generator's SMIB dialog which shows details on the generator eigenvalues.
- Transient Stability: Modified the labels on the axis to change format by default as appropriate. Thus if the absolute value of minimum and maximum values are both less than 0.01 it will automatically switch to scientific notation. This will also happen if both min/max are either greater than 10,000 or less than -10,000.
- Transient Stability: Added ability to store results for the apparent power at the from and to ends of a branch.
- Transient Stability: When choosing to store results to the Hard Drive, previously if no directory was specified to which results should be saved then results would not be saved to hard drive at all. Now if the directory is blank, Simulator will default to save data in the same directory as the case was loaded from. Note that if an invalid directory is specified it will still not save results.
- Transient Stability: Modified the generator fields for Maximum Frequency and Minimum Frequency to show actual frequency instead of the deviation from nominal.
Bug Fixes
- Contingency Analysis: Fixed potential access violation when using Advanced Limit Monitoring to look for voltage deviation violation in percentage instead of per unit.
- Distributed Computing: Under some circumstances, distributed computation could freeze at the end of a distributed run (either contingency or ATC). This has been fixed.
- PV Curve: In the "New Plots" features if you have defined a value to contained in a plot it is automatically stored as part of the result while running the PV tool. However, when choosing to plot a bus dV/dQ value, the value was not being tracked properly with this new feature. This has been fixed.
- Sensitivities: Fixed error in performing AC TLR sensitivities which was caused by a bug introduced in the speed enhancement from July 23, 2010
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Date List
New Features
- File Formats: Added a log warning
message when appending an EPC file which causes
a transformer branch to be converted to a normal
branch.
- Transient Stability: Added ability
when reading an EXWTGE wind electrical model
from a GE DYD file to detect if the EXWTGE
record represents an older version of that
records format. The EXWTGE record is then read
using the older parameter order.
- Transient Stability: Added full
support for the LDFR load characteristic model.
- Transient Stability: Added read/write
support for the CSTATT model.
Bug Fixes
- Available Transfer Capability: Fixed
an error that could occur when running an
iterated ATC simulation that involved
conditional contingency elements.
- Power Flow Solution: Fixed a bug
which could cause solution convergence
difficulty when allowed discrete switched shunts
to switch in the inner power flow loop.
- Oneline Diagrams: Fixed access
violation that could occur when auto-inserting
buses objects using the substation record's
latitude/longitude information. An error could
occur if not all buses were assigned to a
substation.
- QV Curve Tool: Modified
qvExtraMonitoring file so that the results can
be easily identified by the contingency and bus
which created the results.
- Transient Stability: Fixed problem
with the default numeric format used for showing
axis label values.
- Transient Stability: Fixed bug with
using the Initialize Reference Angle At Zero
option. The bus frequency measurements were not
being initialized correctly in these situations
which could cause errors in the initial
frequencies and also cause problems due to
stabilizer feedbacks.
- Transient Stability: Fixed error in
initialization of REX exciter model when Xc <>
0.
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Date List
New Features/Minor Improvements
:
Top
Auxiliary Files (SCRIPT and
DATA Sections)
- (July 9, 2010) Added new script command "AutoInsertTieLineTransactions"
which takes now parameters. This deletes all
existing MW transactions and set the unspecified MW
interchange for each area to zero. It then
automatically creates a MW transaction between each
pair of connected areas with a MW transaction
exactly equal to the sum of the tie-line flows.
- (August 4, 2010) When using the
MergeLineTerminals() script command, we now send a
message to the log if no lines are actually selected
for merging.
- (August 11, 2010) Added a new script command "InjectionGroupsAutoInsert;".
This passes no parameters. The options for this
command can be set by populating the object "IG_AutoInsert_Options"
appropriately. The settings available with this
object represent what is seen on the Auto Insert
Injection Groups Dialog.
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Topic List
Available Transfer Capability (ATC)
Tool
- (August 11, 2010) Optimized the code for the
calculate of ATC values to pre-calculate the Line
Outage/Insertion sensitivities prior to running the
ATC. This increased the speed of the single linear
step ATC method by about a factor of 2. Increases
the total speed of the iterated methods by about a
factor of 3.
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Topic List
Bus View and Substation View
Onelines
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Topic List
Case Information
Displays
- (July 7, 2010) Added ability to use other object
type filters with the GenVarLim object.
- (August 11, 2010) Add ability to define "Custom
String Expressions" which represent the
concatenation of strings from the columns of an
object. Included in the was a new function available
in the expression string with format "Str(x1,
minlength, decimals)" where x1 represents a numeric
variable, minlength represents the minimum number of
characters for the result, and decimals represents
the number of characters to the right of the decimal
point.
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Topic List
Contingency
Analysis Tool
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Topic List
Fault Analysis
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Topic List
File Formats
- (June 25, 2010) When using the Present
Topological Differences from Base Case tool, added
the ability to save the removed elements in the EPC
file format using status values of -4.
- (July 7, 2010) When loading the hdbexport file,
modified to automatically add two labels to each
transmission line. One label starts with the "from"
substation name and the other label starts with the
"to" substation name.
- (July 9, 2010) Modified the writing of PTI RAW
files so that switched shunt records always write
out at least one block. If none exists, a single
block with 1 step and size equal to the present MVar
output is written.
- (July 7, 2010) Modified the writing of GE EPC
file so that Multi-Terminal DC converters will write
out the "aloss" parameter in a manner consistent
with how the EPCL file mtTAP.p expects to ensure the
EPCL operates appropriate for WECC data files.
- (August 11, 2010) When reading from an EPC file,
added the reading of the area and zone designation
of a GE branch and transformer. This will not be
stored in the PWB file format for now but will be
added to Version 16's format.
- (September 3, 2010) Added a log warning message
when appending an EPC file which causes a
transformer branch to be converted to a normal
branch.
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Topic List
General
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Topic List
Help
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Topic List
Integrated Topology Processing (ITP)
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Topic List
Model Explorer
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Topic List
Oneline
Diagrams
- (June 25, 2010) When using a contour with a
dynamic interpretation, if all the values being
contoured had the same value the contour image could
appear random. This was remedied by enforcing a
minimum tolerance on the separation between minimum,
nominal, and maximum values of the color map.
- (July 16, 2010) Added a Simulator Oneline option
that alter how Simulator responds when click on a
circuit breaker symbol for a generator display
object. Normally the generator's status is set to
closed and the MW value is reset to its previous
value. The new option allows the value to be set to
its minimum MW output instead.
- (August 11, 2010) When changing to a Saved View
which specifies that a contour be shown, we now
automatically refresh the contour image.
- (August 30, 2010) Added ability to export a oneline diagram as a GIF image.
- (August 30, 2010) Added ability to export a oneline diagram as an animated GIF image (animated the arrows and generator rotors).
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Topic List
OPF Reserves Tool
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Topic List
Optimal Power Flow (OPF)
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Topic List
Power Flow Solution
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Topic List
PV and QV Curve (PVQV)
Tool
- (July 2, 2010) With the PV tool added the
options to interpolate inadequate voltages and to
always report the minimum voltage when monitoring
low limit violations even if no limits are violated.
- (August 4, 2010) When exporting QV results to a
CSV file, all results are now sorted by the voltage
setpoint.
- (August 12, 2010) Added the ability to plot multiple
QV curves on the same plot.
- (August 24, 2010) The more flexible plotting environment available in Transient Stability has been integrated into the PV Curve tool. This is available under "New Plots" on the PV Curve dialog. Note that this is available in addition to the previous plotting tool.
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Topic List
Security Constrained OPF (SCOPF)
Tool
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Topic List
Sensitivity Calculations
- (July 23, 2010) Greatly increased the speed of
calculating multiple element TLR sensitivities.
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Topic List
Simulator Automation Server (SimAuto)
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Topic List
Time Step Simulation
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Transient Stability
- (June 25, 2010) Modified storage to RAM to
automatically include any information needed for a
subplot's horizontal axis data.
- (July 16, 2010) Modified the Generator and Load
dialogs to be sizeable when on the Transient
Stability Tab.
- (July 16, 2010) Modified the Plot Designer
portion of the dialog to have scroll bars
- (July 16, 2010) Added the ability to add to a
Plot a Title Block including an image logo, text,
and a date.
- (July 16, 2010) Added ability to copy to
clipboard or print a plot including the Title Block
and multiple subplots.
- (July 16, 2010) Added ability to close all open
plots from the local menu of a plot and from a
button on the Transient Stability dialog.
- (July 16, 2010) Modified GENCC generators to
require an Xcomp value which is negative.
- (July 16, 2010) Modified the loading of GE DYD
files to also accept a file extension of "DYC". When
loading a DYC file no prompt will appear asking
about deleting existing stability models. The
assumption is that it will append to existing
models.
- (August 4, 2010) When loading in synchronous
machine saturation values specified at 1.0 and 1.2
per unit, if S(1.2) < S(1.0) then Simulator will
flip the values to autocorrect.
- (August 11, 2010) When writing out DYD files, we
now always write out the model names in lower case
characters.
- (August 11, 2010) When write out two bus
equivalent models from the SMIB portion of the
dialog, generators are now automatically set to AVR
= NO.
- (August 11, 2010) Modified to automatically
refresh any open plots when performing the interval
check while running transient stability. Previously
it would only refresh plots if the option was set to
"Transfer Results to Power Flow after Interval
Check"
- (August 11, 2010) Modified the user interface
throughout Simulator to not allow editing of the
power system data when you've transferred the
transient stability state over to the power flow.
Case Information displays will appear yellowed and
editing on most power system model dialogs will not
be allowed.
- (August 11, 2010) Added ability to open only one
end of a transmission branch.
- (August 11, 2010) Fixed bug when using the
default (done by specifying a negative gv1 value)
non-linear steam gate function for the IEEEG1
governor.
- (August 24, 2010) For the IEEEG1 governor model, the following two relationship must be true. K1+K3+K5+K7=1 and K2+K4+K6+K8=1. If they are not true, Simulator will now normalize the values to enforce these equalities.
- (August 24, 2010) When choosing to show a transient stability plot on the execution of the stability run, the simulation will now automatically update the plots with appropriate data after each interval check. Previously the user would also have to specify this update if they want the plots to actually show data.
- (August 30, 2010) Added toolbars to the generator's SMIB dialog which shows details on the generator eigenvalues.
- (August 30, 2010) Modified the labels on the axis to change format by default as appropriate. Thus if the absolute value of minimum and maximum values are both less than 0.01 it will automatically switch to scientific notation. This will also happen if both min/max are either greater than 10,000 or less than -10,000.
- (August 30, 2010) Added ability to store results for the apparent power at the from and to ends of a branch.
- (August 30, 2010) When choosing to store results to the Hard Drive, previously if no directory was specified to which results should be saved then results would not be saved to hard drive at all. Now if the directory is blank, Simulator will default to save data in the same directory as the case was loaded from. Note that if an invalid directory is specified it will still not save results.
- (August 30, 2010) Modified the generator fields for Maximum Frequency and Minimum Frequency to show actual frequency instead of the deviation from nominal.
- (September 3, 2010) Added ability when reading
an EXWTGE wind electrical model from a GE DYD file
to detect if the EXWTGE record represents an older
version of that records format. The EXWTGE record is
then read using the older parameter order.
- (September 3, 2010) Added full support for the
LDFR load characteristic model.
- (September 3, 2010) Added read/write support for
the CSTATT model.
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User Interface Dialogs
- (June 25, 2010) Added ability to assign Case
Comments to a case which designate a person's name
and a time along with the comment. These are only
stored in the PWB file format.
- (July 7, 2010) Added support for storing
interface MW, Mvar, and MVA flows as part of the
transient stability results.
- (July 7, 2010) Added ability to show the number
of elements in a Transient Contingency.
- (July 7, 2010) Modified the Transient
Contingency Element Dialog to show the filter
information for choosing the object by default.
- (July 9, 2010) On the Present Topological
Differences from Base Case dialog, the various case
information displays of removed elements have been
modified to provide a mechanism to right-click on a
selection and choose to Save Selected to EPC file.
- (August 11, 2010) On the Auto-Insert Injection
Groups Dialog, add an option to name an injection
group by a specific name. This will only be used if
only ONE injection group ends up being created based
on the other options. The intent is to use this in
conjunction with the new scrip command "InjectionGroupsAutoInsert;".
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Bug Fixes:
Top
Auxiliary Files (SCRIPT and
DATA Sections)
- (July 23, 2010) Fixed access violation caused when
calling MergeLineTerminals() with no branches
actually meeting the filter. This will now simply do
nothing instead.
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Available Transfer Capability (ATC)
Tool
- (August 24, 2010) Corrected loading in transfer limiters from an aux file when they are processed for only a single run and not for multiple scenarios.
- (September 3, 2010) Fixed an error that could
occur when running an iterated ATC simulation that
involved conditional contingency elements.
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Bus View and Substation View
Onelines
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Case Information
Displays
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Contingency
Analysis
- (July 7, 2010) Fixed bug that would prevent
creating the following object types from an
Auxiliary File or by copy/paste from a spreadsheet:
ContingencyElement, CTGElementBlockElement,
GlobalContingencyActionsElement,
PostPowerFlowActionsElement.
- (August 11, 2010) Fixed a potential error that
could occur if PostCheck contingency actions were
used in combination with the "Solve Power Flow"
contingency action.
- (August 11, 2010) When specifying a
Post-Contingency AUX file which does not exist on
your computer, Simulator is supposed to show a
dialog telling you this and then abort the
contingency simulation. This was not working
properly and error was appearing saying "Cannot
focus a disable or invisible window.". This error
has been fixed.
- (August 30, 2010) Fixed potential access violation when using Advanced Limit Monitoring to look for voltage deviation violation in percentage instead of per unit.
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Distributed Computation
- (August 12, 2010) Continued stability improvements for
the distributed computation add-ons.
- (August 30, 2010) Under some circumstances, distributed computation could freeze at the end of a distributed run (either contingency or ATC). This has been fixed.
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Fault Analysis
- (June 25, 2010) Fixed error with the handling of
out-of-service switched shunt when using the IEC-909
fault calculation.
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File Formats
- (July 9, 2010) When saving any file, Simulator was
prompting the user about adding a comment to the
file. This will now only be done when saving to the
most recent PWB file format.
- (July 16, 2010) When appending a case using a
RAW or an EPC file, set the area and zone numbers
for loads. Previously these were not updated when
appending.
- (July 16, 2010) Fixed error that would occur if
choosing to save out an EPC file and then hitting
cancel.
- (July 23, 2010) Fixed potential error when
reading an PTI *.seq file for sequence data. It was
possible for the transformer zero sequence impedance
to not properly read from this file.
- (August 4, 2010) When writing out the internal
generator R and X values to a RAW file, an old
limitation existed preventing values larger than
999. This limitation has been removed.
- (August 4, 2010) When loading text files,
modified to treat TAB characters identically to
SPACE characters.
- (August 4, 2010) When appending to a case (from
an EPC, RAW, or PWB file) if the From and To
designations of a branch are backwards in the
appending file, then the designations will now be
flipped as part of the appending processes.
- (August 11, 2010) When writing out the DC
converters for a multi-terminal line to an EPC file,
Simulator write out modes of 0, 4, or 5 if the
multi-terminal DC line had only 2 converters
(similar to what is done for the Two-Terminal DC
lines). This was reported as causing problem when
reading into GE, so we now will write only 1, 2, or
3 instead.
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General
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Help
- (June 28, 2010) Added help files and block diagrams to
the PowerWorld documents download page
here.
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Memory
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Integrated Topology Processing (ITP)
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Model Explorer
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Oneline Diagrams
- (June 25, 2010) On the contour dialog, the choice
of interpretation was not being saved properly to a
PWD file. Thus when the diagram was reopened the
choice was not retained. This has been fixed.
- (July 7, 2010) Fixed flashing hint windows
caused by interaction between navigation arrows and
oneline hints.
- (July 23, 2010) Fixed error with anchoring of
transmission line objects after saving some oneline
diagrams.
- (August 4, 2010) Changed the icon size for the
end of transmission lines to be smaller when
exporting to a KML file.
- (August 11, 2010) When switching to a Saved View
which specified that no contour should be shown, the
contour was not properly removed. This has been
fixed.
- (September 3, 2010) Fixed access violation that
could occur when auto-inserting buses objects using
the substation record's latitude/longitude
information. An error could occur if not all buses
were assigned to a substation.
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OPF Reserves Tool
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Optimal Power Flow (OPF)
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Power Flow Solution
- (June 25, 2010) Fixed error in handling of phase
shifters in the DC approximation solution.
- (July 9, 2010) Fixed error caused when a MTDC
Converter ended up with a current flow of exactly
0.0 amps. This resulted in a number being equal to
0/0 which resulted in a "NAN" result causing the
power flow to fail.
- (August 4, 2010) When calculating the flow on a
branch after solving a DC power flow, the
contribution of MW Line Shunts was not properly
handled. The actually DC power flow solution was
correct, but the line flow would not be correct.
This has been fixed.
- (August 24, 2010) Fixed improper handling of magnetizing conductance in some locations when using the DC power flow approximation.
- (September 3, 2010) Fixed a bug which could
cause solution convergence difficulty when allowed
discrete switched shunts to switch in the inner
power flow loop.
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PV and QV Curve (PVQV) Tool
- (June 25, 2010) Removed irrelevant message dialog
when saving QV results to an AUX file. This occurred
for QV curves involving a contingency which could
not be solved.
- (July 16, 2010) Added more error handling when
saving the tracking results file in the QV curve.
This should help prevent process failures when the
file network location is unavailable.
- (July 23, 2010) Fixed problem with plotting base
case values on the horizontal axis. Need to
determine plot points based on a common nominal
shift and can't assume that there will be the same
number of points in a scenario and the base case
results.
- (August 30, 2010) In the "New Plots" features if you have defined a value to contained in a plot it is automatically stored as part of the result while running the PV tool. However, when choosing to plot a bus dV/dQ value, the value was not being tracked properly with this new feature. This has been fixed.
- (September 3, 2010) Modified qvExtraMonitoring
file so that the results can be easily identified by
the contingency and bus which created the results.
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Security Constrained OPF (SCOPF)
Tool
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Sensitivity Calculations
- (August 4, 2010) Fixed bug in the LODF
calculations introduced in the July 23 patch.
- (August 30, 2010) Fixed error in performing AC TLR sensitivities which was caused by a bug introduced in the speed enhancement from July 23, 2010
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Simulator Automation Server (SimAuto)
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Time Step Simulation
- (June 25, 2010) Fixed problem when pasting
injection group data from Excel into time step
simulation input.
- (July 2, 2010) Fixed bug with deleting columns
from injection group inputs.
- (July 2, 2010) Fixed problem with scaling load
with injection group inputs.
- (July 2, 2010) Fixed ability to defined load
fields as part of result tracking.
- (August 4, 2010) Fixed bug with writing out
injection group CSV files that would add the date
and time to the file twice. This would also have
affected the switched shunt CSV files.
- (August 4, 2010) Added scroll box around options
on the Time Step Simulation dialog.
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Transient Stability
- (June 25, 2010) Modified storage of Transient
Contingencies to an AUX file to properly use number
identifiers when appropriate.
- (June 25, 2010) Fixed error in initializing the
SMIB calculation to properly handle a generator that
was de-energized.
- (June 25, 2010) When storing data to Hard-Drive
while using the Integrated Topology Processing,
information is now stored using the full-topology
bus number identifiers so that they can be properly
read back in.
- (June 25, 2010) Fixed error in handling of
Generic Limit Monitors looking at over frequency for
synchronous generators. The action to take was
not being properly interpreted.
- (July 7, 2010) Fixed bug with writing TSR files.
The bug was introduced in July 2 patch.
- (July 7, 2010) Some problems with access
violations when running stability were encountered
related to the plot designer. These should be fixed
now.
- (July 7, 2010) When auto-correcting the Xl value
for a GENSAL, GENROU, or other synchronous machine
model, the informational message had a typo
indicating it was changing Xqp. This typo has been
fixed.
- (July 7, 2010) The auto-correction routine was
not allowing the Linc value of a GAST_GE model to be
near zero. This restriction has been removed.
- (July 23, 2010) Fixed error when plotting either
7 or 10 subplots on a single plot. The subplots were
not laid out properly.
- (August 4, 2010) Fixed a bug where trying to
show a plot at the execution of transient stability.
The plots were shown but never properly refreshed.
- (August 4, 2010) Modified so that the generator
internal R and X values are always updated to match
the generator subtransient or transient impedances
as appropriate. This is done when the stability is
either solved or when the stability data is loaded
or stored. These fields must match and the stability
data exported to other software must reflect the
fact that Simulator always uses the data specified
with machine models.
- (August 4, 2010) Fixed a bug in how the
saturation of GENROU and GENSAE models was handled.
- (August 11, 2010) Modified to better handle the
saturation of the GENTPF and GENTPJ generator models
- (August 24, 2010) Fixed an incorrect choice in the choices appear in the Toggle Drop-Down for generator objects's Governor Response Limits.
- (August 24, 2010) Fixed typo for the column heading which mixed up the K1 and K2 parameters for the IEE2ST stabilizer.
- (August 24, 2010) Fixed the running of multiple transient contingencies to obey the SKIP field of a transient contingency. Previously we were always running all the transient contingencies. It will now skip them as specified.
- (August 24, 2010) For some generators there were hard limits on the value of H, D, Tdo, Tdop, and the Saturation values. These limits previously were auto-corrected but have been changed to leave the values and only create a warning.
- (September 3, 2010) Fixed problem with the
default numeric format used for showing axis label
values.
- (September 3, 2010) Fixed bug with using the
Initialize Reference Angle At Zero option. The bus
frequency measurements were not being initialized
correctly in these situations which could cause
errors in the initial frequencies and also cause
problems due to stabilizer feedbacks.
- (September 3, 2010) Fixed error in
initialization of REX exciter model when Xc <> 0.
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User Interface Dialogs
- (June 25, 2010) Fixed multi-section line dialog
bug. The Find From Bus button did not work when
inserting a new MS Line.
- (July 9, 2010) Fixed error in feature to remove
additional GE EPC data from the case.
- (August 11, 2010) Removed old options to
"automatically open overheated lines during
simulation".
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