Difference Case

• Added the GE Long ID field for loads
• In the Present Topological Differences from base case tool, the removed objects did not support the case information display filtering by owner, but only display filtering by Area/Zone. This has been modified to also support Owner filtering.
• Added the Area/Zone/Owner filter menu/case info toolbar option to the Removed object tables in the Topological Differences from Base Case dialog. The functionality to filter these tables by area/zone filters had just recently been added so there had previously been no reason to care about them from these tables.
• Modified the Base Case Topological Comparisons dialog so that user may use Data Maintainer filters to specify which objects to write out to a file.
• Added ability for the list of Removed Substations in the Present Topological Differences from Base Case tool to properly use the Area/Zone/Owner filters.
• Added Case Info Customizations for all case information displays used with the Difference Case tool dialog.
• Added a button to remove field customizations for all of the difference grids on the topological differences dialog.
• When showing some values in difference flows we show the Present Value followed by a | character followed by the Base Value such as ” 103.45| 206.45″. Depending on how wide the column is on the display however the text may have the portion of the string with the | character truncated. If the user can not see the | character it makes is confusing as to whether the value has changed or not. To avoid this confusion, we will now show the background color of cells shown in difference flows that contain a | character with a slightly different background color to indicate the value has changed.
• Modified the Present Topological Differences from Base Case tool so that when choose to Save the differences of the Complete Model to an AUX file, the user may now define an AUX Export Format Description object indicating which objects and field lists to use for the export. This appears on the confirmation dialog for exporting the AUX file with the differences. The format will determine the objects that are saved for NEW, BOTH, and REMOVED types of objects. The format will determine the fields for NEW and BOTH types of objects, but any required fields will also be included with NEW objects.
• Added support for branch fields RegBus and RegBusNumUsed
• Added support for generator fields CTGPreventAGC, CTGPartFact, CTGMaxResp, CTGMaxRespPerc, and Online
• Added a new object called DiffChangeTolerance which allows you to specify the tolerance used during the Change mode to determine if a floating point number has changed enough to be considered different. The default for all fields is a change of more than 0.0001% (6 significant digits), although defaults for Bus Voltage and Angle as well as Bus/Substation Latitude/Longitude are included that require slightly more precision.
• Added many new fields related to Transient Stability input to the Difference Case tool. This includes the following fields for respective objects
  • Gen: TSMachine, TSExciter, TSGovernor, TSStabilizer, and TSOther
  • Load: TSDistEquivMVABase, TSDistGenMVABase, TSDistEquiv, TSDistGen, TSDistEquivMVABaseUsed, TSDistGenMVABaseUsed, TSDistEquivUsed, TSAlgebraic, TSDynamic, and TSRelay
  • Shunt: TSModelName
  • Branch: TSRelayName
  • Bus: TSDistEquivMVABase, TSDistGenMVABase, TSDistEquiv, and TSDistGen
  • Area: TSDistEquivMVABase, TSDistGenMVABase, TSDistEquiv, and TSDistGen
  • Zone: TSDistEquivMVABase, TSDistGenMVABase, TSDistEquiv, and TSDistGen
  • Owner: TSDistEquivMVABase, TSDistGenMVABase, TSDistEquiv, and TSDistGen
• Modified the Present Topological Differences From Base Case dialog so that there is a new check box called For summary table statistics, show counts using Area/Zone/Owner/DataMaintainer filtering. This box is not checked when the dialog is first opened, but if you check this box, then the summary statistical counts will be based on objects that meet the Area/Zone/Owner/DataMaintainer filtering in the case.
• Added features to the Present Topological Differences tool to write out EPC files for Both and New objects lists. Previously you could only do this for the Removed objects.
• Added ability to use the Difference Case tool to save ONLY the changes in transient stability models to either an AUX, DYD, DYR, or SWI file.
• Diff Modified field added with all transient stability models to indicate if a model parameter, Device Status, Criteria, or the reference to another object have changed between the Present and Base case. This field will be blank if a model exists in the Present case that was not in the Base case.
• When in the Difference Case Mode of either Change or Difference, all case information displays showing transient stability models will only show stability models that have been modified (Diff Modified = YES or blank)

Fault Analysis

• Added faulted bus nominal voltage to the multiple fault results table
• Added a log message for FaultAna when the user selects a pre-fault profile of Solved Power Flow, but the power flow solution fails before applying the fault. An abort message is added to the log, and the attempted fault calculation is cleared.

Limit Monitoring

• Added storage in the Window Registry for the user interface options on the Limit Monitoring Dialog. Previously the following was maintained during a session of PowerWorld Simulator, but after you closed Simulator and reopened it, it was not retained. The options include
  1. The check box status of “Only show the primary bus for each superbus”
  2. The choice under the “Elements to Show”
  3. Which tab you are on the dialog

Oneline Diagrams

• Adding the ability to be able to open Areva path overview onelines.
• Delta Per Mouse Click value can now be specified for generator Cost Multiplier field
• Added a new field to a Branch object called the BranchCloseAngleThreshold. Specifying a non-zero value for this field will impact how oneline diagrams behave for this branch. When clicking on the circuit breaker objects on a oneline diagram that represent the status of a particular branch, if the branch is presently OPEN and the angle difference across the branch is greater than the threshold specified, then the oneline diagram will not permit you to close in this branch. This was added to help users perform operating training simulations.
• Added color map for showing integer values.
• Oneline Link object can specify a left-click option and up to two right-click options
• Oneline menu accessed by right clicking in the background of a oneline has option to Open oneline script command dialog that will allow script commands to be performed on the oneline
• Adding the ability to pan to display objects via the Areva “find” command when loading in a oneline via a oneline link.
• Adding the ability to open Areva substation onelines from the right click menu on string grid displays. Also can search for onelines in the Oneline Viewer.
• Adding the ability to open Areva substation onelines from MTDC bus, converter and line lists; three-winding transformers; interface elements; substations; superbuses; subnets and scheduled actions lists.
• Modified the oneline hints for branch objects to identify the BranchDeviceType in the Object Identifier string shown when popping up oneline hints.
• Added a new GIS option to move bus and substation oneline display objects so that they match the latitude/longitude stored with the underlying bus and substation data object information.
• New marker objects are now added to a ‘Marker’ layer by default.
• Added option on the right-click menu for bus display objects to Open Connected AC Branches if a bus has Status = Connected. If the bus has Status = Disconnected the option will be Close Connected AC Branches. When closing branches only branches where the other terminal bus is connected will be closed. If there are any dc lines connected to the bus, their status will remain the same regardless of which option is being used.
• Added hotkey ‘R’ to Oneline diagrams to toggle the orientation of selected buses, gens, loads, and shunts.
• A new dialog will prompt the user when pasting objects to a oneline diagram (if they have chosen to copy objects and records). The prompt will ask the user if they would like to create new objects or link to existing objects, which is the previous behavior. Creating new objects will create new objects, including buses, which was not done before. Previously the bus oneline object would still link to the existing bus in the model (“link to existing”). With the new option, a new bus will be created and the oneline object will be linked to the new bus.
• Added options to create new topology sections – both the oneline and case will be modified

Optimal Power Flow

• Added check boxes to the OPF tab of the Area dialog for specify whether to Enforce Branch Limits, Enforce Bus Angles, Enforce Interface Limits, Allow DC Line Control, or Include Marginal Losses.
• Updated column headers for OPFSolutionSummary object type.

Power Flow Solution

• Voltage Droop Control allows specification of renewable plant Q-V characteristic at the point of interconnection
• Voltage Setpoint Tolerance allows generator voltage control closer to reality
• Sped up routine related to calculating island information. This speed up will be especially noticeable in full topology cases when validating the case, solving the power flow, and deconsolidation because during these processes information about the state of the islands is stored for the power flow solution.
• When on island based AGC control and an island does not have any controllable generators, the message in the log will now indicate which island by showing the number of the island slack bus.
• When using the option to Check Generator Mvar Limits Immediately, generators are allowed to hit limits only for the first two voltage control loop iterations. After that they will only be allowed to back off limits. Limits will only be enforced if the Mvar output goes outside of a Mvar limit PLUS a deadband of 10% of the total Mvar Range.

PV and QV Curve

• Added a new field to a load for ScaleMvar. This field defaults to YES. Set to NO to prevent changing the Mvar of this load when shifting power using an injection group (such as in ATC, PVQV, and System Scaling tools)
• Choosing to archive system states to file will now work when using the Reverse Transfer option with the PV tool and a scenario requires a reverse transfer in order to solve. The states that are stored behave a little differently than when doing the normal forward transfer. Keep in mind that only the contingencies that failed during the 0 transfer will be studied using a reverse transfer.
  (1) When choosing to “save only the base case for each critical contingency” the base case state will be saved at any reverse transfer level at which a contingency solved. This is different than how the states are saved during the forward transfer because then the base case state will only be saved at the critical transfer level, i.e. the highest transfer level at which a contingency will solve.
  (2) When choosing to “save all states” both the base case state and the contingency state will be saved at any reverse transfer level at which a contingency solved. This is the same as how the states are saved during the forward transfer.
• Added Maximum Transfer as a critical reason with PV results. This can only appear with the base case scenario. This will appear if the Stop when transfer exceeds transfer level is met. This option would always cause the PV analysis to stop, but there was no indication with the PV results object that this has occurred. A message appears on the dialog, but this couldn’t be determined by just looking at the results.
• Added concise variable names for PVPlotSeries, PVSubPlot, PVPlotVertAxisGroup, and PVPlot objects
• Added ability to specify the Font Size on the plot definition as follows: Vertical Axis Group Labels, SubPlot Horizontal Axis Labels, and SubPlot Legend Labels
• Added ability with the PWPVResultListContainer object to see many of the custom fields for the Contingency object to which these results refer. This includes the Custom Integers, Floats, and Strings, and the Custom Memo.
• On the PV Curve dialog the Present Nominal Shift box shows the transfer that is in the current system state and the caption for the Restore Last Solved State option shows the transfer amount in that state
• Branch and Interface Violations can now be treated as critical scenarios. Violations can also be logged and viewed at each studied transfer level if choosing not to stop the simulation when a violation occurs.

Scheduled Actions

• When closing disconnects that are in series with breakers when using the Use Normal Status option, also close disconnects that are in series with Load Break Disconnects. This makes sense because we are treating breakers and load break disconnects the same when we are identifying breakers to open or close devices.
• Added another check when the Use Normal Status option is in use to return disconnects that are in series with the branch that is being returned to service. If a branch is an Open Breaker action, any disconnects that are in series with it and are normally closed will be closed.
• Added Scheduled Actions tab to dialogs for Gens, Loads, Lines, Switched Shunts, and Interfaces containing a case information display listing the Scheduled Actions that target the selected object. The tab is hidden if there are no Scheduled Actions defined in the case.
• Added options to the Scheduled Action grid local menu allowing the user to isolate or energize the target device with breakers.
  Disabled mouse-wheel scrolling over the Scheduled Actions active time window.
• We now allow Scheduled Actions with a Mapping Status of Unmapped to be loaded from a CROW file regardless of uniqueness. Note that these non-unique actions will only be accessible in the GUI after loading from a CROW file; they cannot be read in from an AUX file or PWB.

Security Constrained OPF (SCOPF)

• Added a column on the LPVariables grid to show the contingency name that corresponds to the variable. Previously it was possible to have variables with the same ID, making it impossible to uniquely identify a variable.
• Added the contingency name to the ‘Bus Marginal Controls’ header to allow correlation between the controls and ‘LP Basic Variables’
• Added fields (i) Violated Primary-Element Label, and (ii) Violated Secondary-Element Label for SCOPF.
  These show the label of the line or interface that is violated.

Sensitivity Calculations

• Added option with Advanced LODF Calculation to Include Contingencies Creating Islands. This option is true by default because that is what we had been doing before adding this option. If a contingency creates a new island, we report the LODF as a very big number to indicate that this value cannot be calculated. This option can be used to exclude these types of contingencies from the results.

Time Step Simulation

• Updated time step summary to show load/gen/shunt results as opposed to input.
• Modified TimeDomainOPF so it sets the GIC time value to be the offset time from the start of the time domain simulation.

Transient Stability

• Transient Stability Options
  • New filtering options have been added with the Store to Hard Drive Options that make it possible to be very specific about the information stored
• Transient Stability Solution
  • The swing equation for synchronous machines is 0.5/H*[(Pmech – Dw)/(1+w) – Telec]. In the result reporting for Simulator, the the accelerating power was being reported as Pmech – (1+w)*Telec and thus did not include the impact of the damping term D. For the vast majority of model the D term should be zero, however if D is not zero, then we will now report the accelerating power as Pmech – Dw – (1+w)*Telec instead.
  • Added the ability to specify the TSDistGenMVABase with a Load, LoadModelGroup, Bus, Owner, Zone or Area. The MVABase then assumed for the Load Distributed Generation model will be the TSDistGenMVABase associated with the object from which the Load is inheriting it’s model. Thus if the Owner object has a Load Distributed Gen model, the Owner object’s TSDistGenMVABase will be used. The exception to this is that any Load object that has a TSDistGenMVABase specified will automatically use that MVABase regardless of where the model is inherited from.
  • When counting the number of consecutive algebraic network solutions using the option “Abort after number of failed solution”, Simulator will no longer increment the counter for failed solutions while a fault has been applied in the system.
• Transient Limit Monitor
  • Time to Begin Checking options added with individual transient limit monitors. By default the global options that had previously existed will be used.
  • Time to Stop Checking options added with individual transient limit monitors. By default there will be no stop in checking. There is no global option for this.
  • Limit Logic that allows the logical combination using AND, OR, and NOT of Transient Limit Monitors
• Transient Remedial Actions
  • Remedial Actions defined for steady state contingency analysis can be used with transient stability
• Transient Models
  • Breaker delays can be specified with branches, generators, loads, and switched shunts. Various rules apply for branch relays to use these breaker delays as part of the relay model. Breaker delays are also used with transient remedial action scheme implementation when opening or closing devices.
  • Machine Models
    • Modified new DER_A model to add parameter Trf and Vpr
    • Added storage of result of the Vmin and Vmax values to the DER_A model
    • Modified DER_A model by adding two new parameters Iqh1 and Iql1 as limits on the extra reactive current injection path.
    • Modified WT3G, WT4G, REG_A, PVD1 type model that have “reactive current management” that prevent high voltages on voltage source converter machine models. Previously if the initial terminal voltage was above the high voltage limit, we would ignore this limit completely. This has been modified so that instead the high voltage limit is set equal to the initial terminal voltage. Indication that this is occuring will appear in the Validation Warnings.
    • Modifications in DER_A model and DGDER_A model to modify the feedback of Pord to the power and reactive power control blocks. This must be the feedback for this model because the fractional tripping means that the terminal power is not an appropriate feedback.
    • Also modified how the rrpwr rate limit on the Ip power block works. It will not rate limit based on the absolute value. Thus if Ip >=0 then it will be a rate limit in the positive direction and if Ip <=0 then it will be a rate limit in the negative direction. This way it will always permit the device to quickly move toward zero power, but then limit how quickly it moves away from zero. This is needed in case the DER_A is used to represent a storage device.
    • Added a way to modify the REGC_A and REGC_B MW Set Point (Exciter Pref input) from the contingency element when there is only an Exciter REEC_A among similar variations of the REEC model in the generator.
    • Modified the REGC_B model to include a Imax current limit and DQFlag. This impacts the network interface equation for higher currents for the REGC_B model and for the DER_A model (and thus DGDER_A as well).
  • Exciter
    • Added DC1C, DC2C, DC4C
    • Added AC1C, AC2C, AC3C, AC4C, AC5C, AC6C, AC7C, AC8C, AC9C, AC10C, AC11C
    • Added ST1C, ST2C, ST3C, ST4C, ST5C, ST6C, ST7C, ST8C, ST9C, ST10C
    • Added CELIN
    • Modified the AC7C exciter model to add a switch SW3.  SW3 = 0 then feedback of Efd through the KR block is used (as in the IEEE 421.5 spec) SW3 <> 0 then feedback of Ve through the KR block is used
    • Modified the AC7C exciter model to add a switch spdmult. spdmult = 0 means that the output is not multiplied by speed (as in the IEEE 421.5 spec) Spdmult <> 0 mean that the output is multiplied by speed
  • Governor
    • Added support for the newer Bradley Governor for Chugach (HGBLEM)
    • Added model h6e that represents a Hydro Turbine with an American Governor Company Controller.
    • Added transient stability validation checks to UCCPSS, UCBGT, and UHRSG
    • Added GGOV1DU governor model which is identical to GGOV1 but has up and down deadband limits on the input frequency signal.
    • Added TURCZT
    • Added BBGOV1
  • Stabilizer
    • Added PSS2C, PSS3C, PSS4C, PSS4B, PSS5C, PSS6C, PSS7C
  • Overexcitation Limiter
    • Added OEL1B, OEL2C, OEL3C, OEL5C
  • Under Excitation Limiter
    • UEL2C, UEL
  • Stator Current Limiter
    • SCL1C, SCL2C
  • Plant Controller
    • Made more descriptive validation error messages for REPC_A and REPC_B when the model does not have a measurement branch specified. Unless this model is only controlling voltage, then a branch must be specified at which the Qbranch, Pbranch, and/or Ibranch is measured. If the branch is not specified when it is needed an error message will appear indicating why the measurement is needed.
    • Added a new plant controller named REPC_B100 which is the same as REPC_B but instead of allowing 50 generators to be referenced, you can have 100 generators.
      REPC_A and REPC_B models would spit out validation errors when they were configured to measure a branch P, Q, or I and no branch was specified on which to perform this measurement. PowerWorld’s hope was that by making this an error which prevented the running of transient stability, this would force the input data to be updated over time, however after a few years it has become clear that this error just confuses folks and the input data has not been updated. We have modified it so that this is now a warning and indicates to the user that all input of IBranch, QBranch, and PBranch will be assumed to be zero until the data is updated.
    • Added some error messages to the log when loading the REPC_B models which reference either bus numbers that do not exist or generator/shunt objects by ID which do not exist in the case.
    • Added a warning message in Validation of transient stability if a REPC_B model exists but has no Control Devices specified
    • Added transient stability validation checks on REPC_A and REPC_B about having PMax >= Pmin and Qmax >= Qmin.
    • Modified the default parameters for the REPC_B model. Previously Pmin=0; Pmax=2.0; femax=1.0; femin=-1.0.
      This made sense for the REPC_A model on which this is based where the output represented the Pref of a single generator. However, for REPC_B, the value Pext represents the DEVIATION of power from the initial starting point and thus using Pmin=0 was inappropriate as a default. Devalut values have been changed to Pmin=-99; Pmax=99.0; femax=99.0; femin=-99.0.
  • Load Characteristics
    • Fields added to prevent using the models for loads that do not meet specified criteria: Filter Pmin, Filter Qmin, and Filter Vmin
  • Load Distribution Equivalent
    • XFMinkV field added to indicate the minimum nominal kV at which a distribution equivalent will include the transformer. If set to 0 the global option will be used.
  • Load Distributed Generation
    • Added support for a new Load Distributed Generation model DGDER_A. This is the same model as the machine model DER_A, however it is instead applied to the Distributed Generation portion of the load record.
  • Load Relay
    • Added the ability to read and implement the LSDT3A model which uses a separate PickupValue as compared to the Setpoint value.
  • Line Relay
    • Modified the interpretation of Direct parameter of the LOCTI, TIOCR1, and TIOCRS over-current models. Previously it only had options 0 and 1 below. Option 2 has been added.
      0 – means no directional element
      1 – means directional element AND Direction will be based upon current leaving the FROM end of the branch
      2 – means directional element AND Direction will be based upon current leaving the TO end of the branch
  • Generator Relay
    • Modified the LHFRT model so that when obtaining the frequency measurement at the bus, if the voltage is below the “Minimum PU voltage for relay frequency measurement”, then the frequency is treated as at nominal
    • Added a new generator relay model called GP3 which was developed in the NERC SAMS committee.
  • DC Line Model
    • Added support to CHVDC2 to use the parameters which attempt to emulate commutation failure.
  • Switched Shunt
    • Added ABBSVC1
    • Added MSS2
    • Added MSS1
    • Added the check for the Xc value on svsmo1,2 and 3 to give a warning during validation if the value on the transient model is different from the power flow.
• Transient Plots
  • Added the requested ability to add the case name into the plot name when in auto save. If the option is checked then the name will have the following format: ContingencyName_PlotName_CaseName.jpg. Otherwise it will be naming the plot as before.
  • Modified the Plot Designer portion of the Transient Stability and PV Curve tool dialogs so that list of plots, subplots, and vertical axis groups will show more meaningful captions for Subplots and Vertical Axis Groups. Previously they were identified only by number. Now, Subplots and Vertical Axis Groups will show captions based on the following priority.
    1. TitleCaption if specified
    2. FooterCaption if specified (applies only to Subplot)
    3. If it contains only one plot series, it will show the same header as that plot series
    4. If all plot series it contains have the same field then it will show the field
    5. If all plot series it contains have the same object then it will show the object identifier
    6. If all else fails it will revert back to the number
  • Added ability to specify the Font Size on the plot definition as follows: Vertical Axis Group Labels, SubPlot Horizontal Axis Labels, SubPlot Legend Labels
  • If choosing to Auto-Save an Image File of the Plot and the data is not selected to be stored to either the RAM or hard drive, after the plot file is generated the data will be deleted.
• Transient Results
  • Added the ability to filter transient result events table from Object type.
  • Added VFE of ESAC8b_PTI into the State Other Fields.
  • Added substation field for average ROCOF.
  • Added new Branch field for storing results called Minimum Profile Vpu. This field calculates the minimum voltage along the length of the series R and X of a branch. Typically this value is at one of the terminal buses, but it can sometimes end up between the two buses. It is possible for that voltage to approach zero even when both terminals are not zero. This is an indication of the system going out of step. One can monitor this branch field for an indication of the system going out of step.
  • Added VFE of ESAC8B_GE into the State Other Fields.
  • Added result storage of Area ACE value
• Transient Stability File Format Support
  • Added ability to load a OTGD file that represent transient stability contingencies.
  • When reading a REEC_B record from a DYD file we expect to see 30 input parameters after the colon. This record does not support the mva=12.34 syntax as other records sometimes do, however sometimes we see DYD records which start with the mva=12.34 syntax followed by 29 parameters. In this situation it is reasonable to assume that this first parameter should have instead just been 12.34. We have added special processing of the REEC_B record to support this with a warning message written to the log to indicate this has been assumed. Previously we would have just ignored this record completely and reported an error.
  • When reading a DYD file, modified parsing of the LSDT2 model to allow as few as 5 input parameters to be specified with all subsequent parameters assumed as 0.
  • When reading a DYD file, modified parsing of the EWTGFC model so that the last 7 parameters are optional and if omitted will assume the following values: Xc=0, Kqd-0, Tlpqd=0, Xdq=0, Vermn=-0.1, Vermx=0.1, Vfrz=0.7.
  • Added ability to read/write the CHVDC2 model to and from the DYD file.
  • Modified reading the TIOCRS record from DYD file so that any paramter after A can be omitted and a value of zero will be assumed for the parameter
  • Modified reading of LOCTI record from DYD file so that any parameter after Tm1 can be omitted and a value of zero will be assumed for the parameter
  • When reading and writing a DYD file added ability to translate the distrel/zonedef/blindef models into a DistRelay model.
  • Added new right-click option under Save As on a case information displays for Generator, Shunt, LineShunt, and Branch objects, as well as any transient stability dynamic model object for one of these 4 objects. The new option says “DYD Format (only models of selected records)” and will store a DYD file snippet for the objects and models selected. Also include support for some Load objects and models as appropriate.
  • Added support when reading the REPC_B model from a DYD file so that we interpret 2 character ID strings in the parameter list as the IDs of generators or SVCs appropriatly and also write them out as 2 character IDs. Previously these values were required to be numbers which were rounded to the neared integer. Also added special support when reading these values so that number strings such as 2.0 and 34.0 will be interpreted as the ID string 2 and 34.
  • Modified Simulator to read and write CMPLDWG records from and to a DYD file. These are read into Simulator and the final 15 parameters for the DGPV model are striped off and handled separately. The first 4 of these parameters are used to populate the DistMW and DistMvar parameters of the load record in Simulator, but only if the existing load record has zeros for both those values. Then the final 11 parameters are used to create (or modify) a Load Distributed Generation model (DGPV) at the particular load record. When writing out a DYD file, if a CMPLDW model is being written to the DYD, Simulator will check to see if there is an active DGPV Load Distributed Generation model being used by the load. If there is, then the model will be written as a CMPLDWG instead and the appropriate final 15 parameters will be written.
  • While loading in a DYR file, GGOV1DU governor user-model is converted to GGOV1, and the last two parameters are ignored.
  • When loading in WECC SWT files, the case will be started off with 1.0 second of no disturbance. ALL time values you input will have 60 cycles added to them.
  • When reading a DYR file, the USRMDL REPCTAU1 is now mapped to REPCTA1
  • Added ability to save transient results shown in the Results from RAM case information displays directly to the Comtrade formats.
  • Added the ability to read and write for GE PSLF for up to 4 generators for the TS model CCOMP4.
  • When reading a DYR file and finding several USRMDL govenor models that are identical to an existing governor model except for the addition of a deadband, modified to simply read this governor as the existing governor model ignoring the deadband. In Version 21, we will read and translate to new governors, but for now simply convert to a governor without a deadband. This includes the following
    GASTWDDU –> GASTWD
    HYGOVDU –> HYGOV
    IEESGODU –> IEESGO
    IEEEG1SDU –> IEEEG1
    WPIDHYDU –> WPIDHY
  • When reading a DYR file and finding a USAC6AU as a USRMDL exciter, modified to translate to the existing ESAC6A. This model is idential to the ESAC6A, except for the implementation of the non-windup limit on the Lead-Lag block of the (1+sTc)/(1+sTb). Simulator Version 21 will include a new AC6A model that implements the lead-lag block non-windup limit using the method described in the IEEE 421.5 standard, but for now in Version 20 we will just translate this model to the existings ESAC6A.
  • When reading a DYR file and finding a HYGOV4 as a USRMDL, modified to translate this to the existing HYGOV4 model.
  • When reading a DYR file and finding several USRMDL govenor models that are identical to an existing governor model except for the addition of a deadband and Trate, modified to simply read this governor as the existing governor model ignoring the deadband. In Version 21, we will read and translate to new governors that include the deadband and Trate. This includes the following:
    GGOV1DU   –> GGOV1D
    GASTWDDU  –> GASTWDD
    HYGOVDU   –> HYGOVD
    IEESGODU  –> IEESGOD
    IEEEG1SDU –> IEEEG1D
    IEEEG1CDU –> IEEEG1D
    WPIDHYDU  –> WPIDHYD
    DEGOV1DU  –> DEGOV1D
    GAST2ADU  –> GAST2AD
    GASTDU    –> GASTD
    HYGOV2DU  –> HYGOV2D
    IEEEG3DU  –> IEEEG3D
    PIDGOVDU  –> PIDGOVD
    TGOV1DU   –> TGOV1D
    TGOV3DU   –> TGOV3D
    WESGOVDU  –> WESGOVD
• Transient Stability Contingency Definitions
  • Added support when auto-inserting transient stability fault definitions to use the new SelfClear feature of a fault.
  • Added a flag SELFCLEAR at the end of a TSContingencyElement Action String for a fault. Normally when a fault point is isolated by opening branches in the system, the fault will NOT automatically clear itself and thus if lines are closed back in the fault will remain in place. When specifying SELFCLEAR, then when a fault point becomes isolated it will automatically clear itself at the same moment.
• Transient Stability User Dialogs and Auxiliary File Support
  • Modified the Transient Stability tab on Load dialog to always show the “Terminal and State Values” tab so that the user knows it’s available. Previously this tab would be hidden on the load dialog if the transient stability simulation had not been initialized. Now it will always appear, but if the simulation is not initialized then it will show all empty values.
  • Added the ability to rename the Device ID from a relay GUI dialog. It will only rename the Device ID if the new Device ID does not exists. If the Device ID already exists then the following message will appear: A Device ID already exists at from/to end (Line Name). Please Modify that particular (Relay Name)relay.
  • Added ability to delete all jpgs in the TS contour toolbar subdirectory. This is just a button on the dialog used to specify saving the TS contour images.
  • Added ability to right-click on the transient stability event case information display and show the dialog associated with the power system object refered to by this action.
  • Added additional concise variable names for transient stability models.
  • Added concise variable names for following objecttypes TSPlotSeries, TSSubPlot, TSPlotVertAxisGroup, TSPlot, TSLimitMonitor, and Transient_Options.
  • Added fields on a Bus, Area, Zone and Owner object to show the presently assigned Load Distributed Generation model name.
  • Added a new Gen object field called TSGovMWCap which returns the MW Base of the active dynamic governor model if available. If either no governer is active or the active governor does not have a MW Base parameter, then this field will appear as blank.
  • Modified how the list of available transient stability model types is displayed when choosing to only “Show Models Supported By” a particular software tool. Starting in Version 20 we would also show models that can be translated to that software tool. This patch changes it so it only shows models natively supported in that tool.
  • Added a new option to Clear Time Values from RAM for ALL the contingencies. Now there is a drop down menu in the Clear Time Values from RAM button with two options:
    -Clear Time Values from RAM for Active Contingency
    -Clear Time Values from RAM for ALL Contingencies
  • When in Difference Case Mode of either “Change” or “Diff”, then all string grids showing transient stability models will only show stability models which have a modified parameter (Modified = YES or blank).
  • On the Result from RAM section of the Transient Stability Dialog, modified the “Clear Min/Max Values, Summary, Evenst, and/or Solution Details from RAM” button so that the dialog which appears gives you the option to either clear results for the Active Contingency, or for ALL Contingencies.

User Interface Dialogs

• Added two new buttons under the Restore> dropdown on the Tools ribbon tab called Store User State and Restore User State. These provide button access to same functionality as available in the script commands StoreState; and RestoreState(USER);
• Separating Save and Save To Aux button on the bus, branch, load, gen, shunt, and lineshunt dialogs. Clicking the Save to AUX will now store the fields specified as part of the built-in Network Model Auxiliary File Export Format Description.
• Changed the hints that appear for the MVA Convergence Tolerance and the AGC tolerance to reference the fields that are in the unit of MVA (instead of the old fields which were in units of per unit)
• When using the Save to Aux button on bus, switched shunt, generator, branch, line shunt, and load dialogs save using fields that are the same as default Network Model fields with the Aux Export Description. When saving switched shunts use appropriate fields if the shunt is allowed to be on control, i.e. control mode <> Bus Shunt. When saving transformers save using appropriate transformer control fields.
• Added a button to the Geography tab of the Substation dialog which copies the Lat/Long information to the system clipboard.
  Also added this feature to the menu when right-clicking on a substation object on a oneline diagram.
• Modified the Model Expression dialog so that the edit boxes that show the information about the variables show more concise text descriptions. They will now show information about what object each variable involves by showing either the primary, secondary, or label identifier depending on the user preference in the Simulator Options under Case Information. In addition they will show a hover hint that gives information on labels, primary, and secondary keys, along with the complete field description for the variable.
• Modified the Generator Information dialog so that if the check-box Use Capability Curve is checked then the Min Mvar and Max Mvar edit boxes can not be edited. This is the same treatment as those fields on the case information displays which do not allow editing of those fields if they are calculated from the capability curves.
• Added the bus label as an informational field on the Renumber Buses dialog.
• Added scrollbars to the Memo that can be entered on object dialogs.