Skip to content

LoadMotor

Aggregate induction motor load. This model is used to represent a fraction of an ordinary load as "induction motor load". It allows a load that is treated as an ordinary constant power in power flow analysis to be represented by an induction motor in dynamic simulation. This model is intended for representation of aggregations of many motors dispersed through a load represented at a high voltage bus but where there is no information on the characteristics of individual motors.

Either a "one-cage" or "two-cage" model of the induction machine can be modelled. Magnetic saturation is not modelled.

This model treats a fraction of the constant power part of a load as a motor. During initialisation, the initial power drawn by the motor is set equal to Pfrac times the constant P part of the static load. The remainder of the load is left as a static load.

_The reactive power demand of the motor is calculated during initialisation as a function of voltage at the load bus. This reactive power demand can be less than or greater than the constant Q component of the load. If the motor's reactive demand is greater than the constant Q component of the load, the model inserts a shunt capacitor at the terminal of the motor to bring its reactive demand down to equal the constant Q reactive load. _

If an induction motor load model and a static load model are both present for a load, the motor Pfrac is assumed to be subtracted from the power flow constant P load before the static load model is applied. The remainder of the load, if any, is then represented by the static load model.

URI: cim:LoadMotor
Type: Class

 classDiagram
    class LoadMotor
    click LoadMotor href "../LoadMotor"
      IdentifiedObject <|-- LoadMotor
        click IdentifiedObject href "../IdentifiedObject"

      LoadMotor : LoadMotor.d

      LoadMotor : IdentifiedObject.description

      LoadMotor : LoadMotor.h

          LoadMotor --> Seconds : LoadMotor.h
          click Seconds href "../Seconds"

      LoadMotor : LoadMotor.lfac

      LoadMotor : LoadMotor.LoadAggregate

          LoadMotor --> LoadAggregate : LoadMotor.LoadAggregate
          click LoadAggregate href "../LoadAggregate"

      LoadMotor : LoadMotor.lp

          LoadMotor --> PU : LoadMotor.lp
          click PU href "../PU"

      LoadMotor : LoadMotor.lpp

          LoadMotor --> PU : LoadMotor.lpp
          click PU href "../PU"

      LoadMotor : LoadMotor.ls

          LoadMotor --> PU : LoadMotor.ls
          click PU href "../PU"

      LoadMotor : IdentifiedObject.mRID

      LoadMotor : IdentifiedObject.name

      LoadMotor : LoadMotor.pfrac

      LoadMotor : LoadMotor.ra

          LoadMotor --> PU : LoadMotor.ra
          click PU href "../PU"

      LoadMotor : LoadMotor.tbkr

          LoadMotor --> Seconds : LoadMotor.tbkr
          click Seconds href "../Seconds"

      LoadMotor : LoadMotor.tpo

          LoadMotor --> Seconds : LoadMotor.tpo
          click Seconds href "../Seconds"

      LoadMotor : LoadMotor.tppo

          LoadMotor --> Seconds : LoadMotor.tppo
          click Seconds href "../Seconds"

      LoadMotor : LoadMotor.tv

          LoadMotor --> Seconds : LoadMotor.tv
          click Seconds href "../Seconds"

      LoadMotor : LoadMotor.vt

          LoadMotor --> PU : LoadMotor.vt
          click PU href "../PU"

Inheritance

Attributes

Name URI Cardinality and Range Description Inheritance
LoadAggregate cim:LoadMotor.LoadAggregate 1
LoadAggregate		 Aggregate load to which this aggregate motor (dynamic) load belongs direct
pfrac cim:LoadMotor.pfrac 1
float		 Fraction of constant-power load to be represented by this motor model (Pfr... direct
lfac cim:LoadMotor.lfac 1
float		 Loading factor (Lfac) direct
ls cim:LoadMotor.ls 1
PU		 Synchronous reactance (Ls) direct
lp cim:LoadMotor.lp 1
PU		 Transient reactance (Lp) direct
lpp cim:LoadMotor.lpp 1
PU		 Subtransient reactance (Lpp) direct
ra cim:LoadMotor.ra 1
PU		 Stator resistance (Ra) direct
tpo cim:LoadMotor.tpo 1
Seconds		 Transient rotor time constant (Tpo) (>= 0) direct
tppo cim:LoadMotor.tppo 1
Seconds		 Subtransient rotor time constant (Tppo) (>= 0) direct
h cim:LoadMotor.h 1
Seconds		 Inertia constant (H) (>= 0) direct
d cim:LoadMotor.d 1
float		 Damping factor (D) direct
vt cim:LoadMotor.vt 1
PU		 Voltage threshold for tripping (Vt) direct
tv cim:LoadMotor.tv 1
Seconds		 Voltage trip pickup time (Tv) (>= 0) direct
tbkr cim:LoadMotor.tbkr 1
Seconds		 Circuit breaker operating time (Tbkr) (>= 0) direct
description cim:IdentifiedObject.description 0..1
string		 The description is a free human readable text describing or naming the object IdentifiedObject
mRID cim:IdentifiedObject.mRID 1
string		 Master resource identifier issued by a model authority IdentifiedObject
name cim:IdentifiedObject.name 0..1
string		 The name is any free human readable and possibly non unique text naming the o... IdentifiedObject

Usages

used by used in type used
LoadAggregate LoadMotor range LoadMotor

Identifier and Mapping Information

Schema Source

  • from schema: http://iec.ch/TC57/ns/CIM/Dynamics-EU#Package_DynamicsProfile

Mappings

Mapping Type Mapped Value
self cim:LoadMotor
native this:LoadMotor