PowerSystems.ElectricLoad Formulations

Electric load formulations define the optimization models that describe load units (demand) mathematical model in different operational settings, such as economic dispatch and unit commitment.

Note

The use of reactive power variables and constraints will depend on the network model used, i.e., whether it uses (or does not use) reactive power. If the network model is purely active power-based, reactive power variables and related constraints are not created.

Table of contents

  1. StaticPowerLoad
  2. PowerLoadInterruption
  3. PowerLoadDispatch
  4. Valid configurations

StaticPowerLoad

Variables:

No variables are created

Time Series Parameters:

Uses the max_active_power timeseries parameter to determine the demand value at each time-step

ParameterDefault Time Series Name
ActivePowerTimeSeriesParametermax_active_power
ReactivePowerTimeSeriesParametermax_active_power

Expressions:

Subtracts the parameters listed above from the respective active and reactive power balance expressions created by the selected Network Formulations.

Constraints:

No constraints are created

PowerLoadInterruption

Variables:

Static Parameters:

  • $P^\text{ld,max}$ = PowerSystems.get_max_active_power(device)
  • $Q^\text{ld,max}$ = PowerSystems.get_max_reactive_power(device)

Time Series Parameters:

ParameterDefault Time Series Name
ActivePowerTimeSeriesParametermax_active_power
ReactivePowerTimeSeriesParametermax_active_power

Objective:

Creates an objective function term based on the FunctionData Options where the quantity term is defined as $p^\text{ld}$.

Expressions:

  • Subtract$p^\text{ld}$ and $q^\text{ld}$ terms and to the respective active and reactive power balance expressions created by the selected Network Formulations

Constraints:

\[\begin{aligned} & p_t^\text{ld} \le u_t^\text{ld} \cdot \text{ActivePowerTimeSeriesParameter}_t, \quad \forall t \in \{1,\dots, T\} \\ & q_t^\text{re} = \text{pf} \cdot p_t^\text{re}, \quad \forall t \in \{1,\dots, T\} \end{aligned}\]

on which $\text{pf} = \sin(\arctan(Q^\text{ld,max}/P^\text{ld,max}))$.

PowerLoadDispatch

Variables:

  • ActivePowerVariable:

    • Bounds: [0.0, ]
    • Default initial value: PowerSystems.get_active_power(device)
    • Symbol: $p^\text{ld}$
  • ReactivePowerVariable:

    • Bounds: [0.0, ]
    • Default initial value: PowerSystems.get_reactive_power(device)
    • Symbol: $q^\text{ld}$

Static Parameters:

  • $P^\text{ld,max}$ = PowerSystems.get_max_active_power(device)
  • $Q^\text{ld,max}$ = PowerSystems.get_max_reactive_power(device)

Time Series Parameters:

ParameterDefault Time Series Name
ActivePowerTimeSeriesParametermax_active_power
ReactivePowerTimeSeriesParametermax_active_power

Objective:

Creates an objective function term based on the FunctionData Options where the quantity term is defined as $p^\text{ld}$.

Expressions:

  • Subtract$p^\text{ld}$ and $q^\text{ld}$ terms and to the respective active and reactive power balance expressions created by the selected Network Formulations

Constraints:

\[\begin{aligned} & p_t^\text{ld} \le \text{ActivePowerTimeSeriesParameter}_t, \quad \forall t \in \{1,\dots, T\}\\ & q_t^\text{ld} = \text{pf} \cdot p_t^\text{ld}, \quad \forall t \in \{1,\dots, T\}\\ \end{aligned}\]

on which $\text{pf} = \sin(\arctan(Q^\text{ld,max}/P^\text{ld,max}))$.

Valid configurations

Valid DeviceModels for subtypes of ElectricLoad include the following:

Valid DeviceModelDevice TypeFormulation
DeviceModel(InterruptiblePowerLoad, PowerLoadDispatch)InterruptiblePowerLoadPowerLoadDispatch
DeviceModel(ExponentialLoad, PowerLoadDispatch)ExponentialLoadPowerLoadDispatch
DeviceModel(PowerLoad, PowerLoadDispatch)PowerLoadPowerLoadDispatch
DeviceModel(StandardLoad, PowerLoadDispatch)StandardLoadPowerLoadDispatch
DeviceModel(InterruptiblePowerLoad, PowerLoadInterruption)InterruptiblePowerLoadPowerLoadInterruption
DeviceModel(ExponentialLoad, PowerLoadInterruption)ExponentialLoadPowerLoadInterruption
DeviceModel(PowerLoad, PowerLoadInterruption)PowerLoadPowerLoadInterruption
DeviceModel(StandardLoad, PowerLoadInterruption)StandardLoadPowerLoadInterruption
DeviceModel(FixedAdmittance, StaticPowerLoad)FixedAdmittanceStaticPowerLoad
DeviceModel(InterruptiblePowerLoad, StaticPowerLoad)InterruptiblePowerLoadStaticPowerLoad
DeviceModel(ExponentialLoad, StaticPowerLoad)ExponentialLoadStaticPowerLoad
DeviceModel(PowerLoad, StaticPowerLoad)PowerLoadStaticPowerLoad
DeviceModel(StandardLoad, StaticPowerLoad)StandardLoadStaticPowerLoad
DeviceModel(SwitchedAdmittance, StaticPowerLoad)SwitchedAdmittanceStaticPowerLoad