Contingency Case References - State Information

See Also

 

Simulator stores the following information with the Contingency Analysis Reference State. This list should include all of the information that can be directly accessed by the user. Care should be taken with modifying any data that is not stored in the reference state as it will not be restored at the end of each contingency.

Bus State

• In or out of service
• Voltage Magnitude and angle
• Boolean expression stating whether any load exists at the bus (this is used because some of the contingency actions such as MOVE GEN will create a fictitious load if there is no generation at the destination bus)
• MW Marginal Cost
• GIC DC Voltage
• Conductance (G)
• Susceptance (B)

Line State

• In or out of service
• Bypassed?
• Transformer Control - Control Mode (YES/NO for transformers, Not Enabled/Enabled for Power Flow/Enabled for OPF Only for phase shifters), Regulation Minimum/Maximum, Line Drop Compensation Reactance (X), Use Line Drop Compensation, GIC Induced Var Losses, Magnetizing G and B
• Tap ratio
• Phase shift
• Series Reactance X (only for series capacitors because a contingency element can change this)
• GIC DC Current
• GIC Induced DC Voltage
• DFACTs Operational Mode
• Line Limits

Line Shunt State

• In or out of service
• Conductance (G)
• Susceptance (B)

Generator State

• In or out of service
• MW Output
• Mvar Output
• Max/Min MW Output
• Participation Factor
• Max/Min Mvar Output
• Voltage Setpoint
• Regulated Bus Number
• AGC Status (YES/NO)
• AVR Status (YES/NO)
• Capability Curve
• Use Capability Curve
• Line Drop Compensation Impedance
• Line Drop Compensation Status (YES/NO/POSTCTG)
• Economic Dispatch Loss Sensitivity

Load State

• In or out of service
• Constant power MW and Mvar components of load
• Constant current MW and Mvar components assuming one per unit voltage
• Constant impedance MW and Mvar components assuming one per unit voltage
• Distributed generation Status, MW Input, and Mvar Input
• MW Scale
• Mvar Scale
• AGC Status
• Min/Max Load MW

Switched Shunt State

• In or out of service
• Auto Control
• Nom value MW, Mvar
• Control mode (FIXED/DISCRETE/CONTINUOUS/SVC)
• Description of Mvar blocks
• Low/high range for control regulation
• Target value for control regulation
• Discrete Control Options - Use Continuous Element, Single Largest Step, Minimum and Maximum Susceptance
• Use High Target Value and High Target Value

Area State

• Unspecified MW Transactions
• MW Scale
• Mvar Scale
• AGC Status
• Area Slack - either bus or injection group
• Loss Percent
• Auto Shunts
• Auto XF

Super Area State

• MW Scale
• Mvar Scale
• AGC Status
• Use Area Participation Factors
• Loss Percent

DC Line State

• In or out of service
• Control Mode
• Setpoint
• Setpoint voltage
• Resistance
• Compounding Resistance
• Rectifier and Inverter Tap Value
• Firing Angles (alpha and gamma)

Multi-Terminal DC Line State

• In or out of service
• Control Mode
• Bus of ac converter station controlling dc voltage
• For each converter - converter setpoint, firing angle, tap, and in or out of service

VSC DC Line State

• In or out of service
• AC and DC modes at each terminal
• AC and DC setpoints at each terminal

Substation State

• GIC DC Ground Voltage
• GIC DC Neutral Voltage
• GIC Grounding Resistance (Ohms)

MW Transaction

• MW Value
• Enabled Status

Limit Group State

• Rating sets for normal operation (Line, Interface…A, B, etc…)
• Bus rating sets for contingency operation

Power Flow Solution Options

The following options can be set as part of the contingency-specific power flow solution options:

• MVA Convergence Tolerance
• Maximum Number of Iterations
• Initialize from Flat Start
• Disable Power Flow Optimal Multiplier
• Dynamically add/remove slack buses as topology is changed (Allow Multiple Islands)
• Disable Checking Gen MVAR Limits
• Check Gen MVAR Limits Immediately
• Check Gen MVAR Back Off Limits Immediately
• Disable Switched Shunt Control
• Disable SVC Control
• Disable Treating Continuous SSs as PV Buses
• Disable LTC Transformer Control
• Min. Sensitivity for LTC Control
• Disable Balancing of Parallel LTC Taps
• Disable Phase Shifter Control
• Model Phase Shifters as Discrete Controls
• Enforce Generator MW Limits
• Prevent Controller Oscillations
• Maximum Number of Voltage Control Loop Iterations
• Min. pu voltage for constant power load
• Min. pu voltage for constant current load

The following are included as part of the reference state but are not included as contingency-specific power flow solution options:

• Disable Angle Rotation Processing
• Disable Angle Smoothing
• Sharing of generator vars across groups of buses during remote regulation
• Disable Transformer Tap Control if Tap Sens. is the Wrong Sign
• Transformer Stepping Methodology
• Use Topology Processing
• Close Breakers to Energize Switched Shunts
• Disable D-FACTS Control