LoadResponseCharacteristic

Class Description

Models the characteristic response of the load demand due to changes in system conditions such as voltage and frequency. It is not related to demand response.
If LoadResponseCharacteristic.exponentModel is True, the exponential voltage or frequency dependent models are specified and used as to calculate active and reactive power components of the load model.
The equations to calculate active and reactive power components of the load model are internal to the power flow calculation, hence they use different quantities depending on the use case of the data exchange.
The equations for exponential voltage dependent load model injected power are:
pInjection= Pnominal* (Voltage/cim:BaseVoltage.nominalVoltage) ** cim:LoadResponseCharacteristic.pVoltageExponent
qInjection= Qnominal* (Voltage/cim:BaseVoltage.nominalVoltage) ** cim:LoadResponseCharacteristic.qVoltageExponent
Where:

    • means “multiply” and ** is “raised to power of”;
  2. Pnominal and Qnominal represent the active power and reactive power at nominal voltage as any load described by the voltage exponential model shall be given at nominal voltage. This means that EnergyConsumer.p and EnergyConsumer.q are at nominal voltage.
  3. After power flow is solved:
    -pInjection and qInjection correspond to SvPowerflow.p and SvPowerflow.q respectively.
  • Voltage corresponds to SvVoltage.v at the TopologicalNode where the load is connected.

Attributes

Name Type Description
exponentModel Boolean Indicates the exponential voltage dependency model is to be used. If false, the coefficient model is to be used.
The exponential voltage dependency model consist of the attributes:
- pVoltageExponent
- qVoltageExponent
- pFrequencyExponent
- qFrequencyExponent.
The coefficient model consist of the attributes:
- pConstantImpedance
- pConstantCurrent
- pConstantPower
- qConstantImpedance
- qConstantCurrent
- qConstantPower.
The sum of pConstantImpedance, pConstantCurrent and pConstantPower shall equal 1.
The sum of qConstantImpedance, qConstantCurrent and qConstantPower shall equal 1.
pConstantCurrent Float Portion of active power load modelled as constant current.
pConstantImpedance Float Portion of active power load modelled as constant impedance.
pConstantPower Float Portion of active power load modelled as constant power.
pFrequencyExponent Float Exponent of per unit frequency effecting active power.
pVoltageExponent Float Exponent of per unit voltage effecting real power.
qConstantCurrent Float Portion of reactive power load modelled as constant current.
qConstantImpedance Float Portion of reactive power load modelled as constant impedance.
qConstantPower Float Portion of reactive power load modelled as constant power.
qFrequencyExponent Float Exponent of per unit frequency effecting reactive power.
qVoltageExponent Float Exponent of per unit voltage effecting reactive power.

Relationships

Inherits from

Descendant classes

  • No descendant classes

Leaf/Root class

IsLeaf IsRoot
False False

Associations

Source Class Cardinality Source Target Class Cardinality Target Source Name Source Assoc. Description Target Name Target Assoc. Description
EnergyConsumer 0..* LoadResponseCharacteristic 0..1 EnergyConsumer The set of loads that have the response characteristics. LoadResponse The load response characteristic of this load. If missing, this load is assumed to be constant power.