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The Power, pos-seq variable frequency component computes the positive-sequence power P (in watts) and reactive power Q (in vars) associated with a periodic set of three-phase voltages and currents. 

P and Q are calculated by evaluating the positive-sequence of the input voltages and currents with a running window over one cycle of the fundamental frequency given by input f. The reference frame required for the computation is given by input wt.

The output is held constant to the specified Initial active power and Initial reactive power values for one cycle of the specified fundamental frequency.

Symbol

Mask Parameters

NameDescriptionUnitVariable = {Possible Values}
DescriptionUse this field to add all kinds of information about the component
Description = {'string'}
Initial frequencyInitial frequency for the first simulation cycle. This value cannot be modified during the simulationHzFinit = { [0, 1e12] }
Minimum frequencyMinimum expected frequency of the input signal. This value cannot be modified during the simulationHzFmin = { [0, 1e12] }
Initial active power
Initial active power value of the magnitude of the output signal for the first simulation cycle. This value cannot be modified during the simulationWPinit = { [-1e64 1e64] }
Initial reactive power
Initial reactive power value of the magnitude of the output signal for the first simulation cycle. This value cannot be modified during the simulationVarQinit = { [-1e64 1e64] }

Input/Output Signals

Name

DescriptionType

Vabc

Vectorized signal containing phase-to-ground voltages (Va, Vb and Vc)Input

Iabc

Vectorized signal containing phase-to-ground currents (Ia, Ib and Ic)Input

f

Frequency signal used to calculate the positive-sequence of the Vabc and Iabc signalsInput

wt

Angle of the reference signal used for the calculation of the positive-sequence of the Vabc and Iabc signalsInput

P

Signal containing the active power of the positive-sequence resulting from the variable frequency voltage and current signalsOutput

Q

Signal containing the reactive power of the positive-sequence resulting from the variable frequency voltage and current signalsOutput

Sensor Descriptions

Name

DescriptionUnit

Vabc[a]

Signal containing the voltage of phase AV

Vabc[b]

Signal containing the voltage of phase BV

Vabc[c]

Signal containing the voltage of phase CV

Iabc[a]

Signal containing the current of phase AA

Iabc[b]

Signal containing the current of phase BA

Iabc[c]

Signal containing the current of phase C

A

f

Frequency signal used to calculate the positive-sequence of the Vabc and Iabc signals

Hz

wt

Angle of the reference signal used for the calculation of the positive-sequence of the Vabc and Iabc signals

rad/s

P

Signal containing the active power of the positive-sequence resulting from the voltage and current signals

W

Q

Signal containing the reactive power of the positive-sequence resulting from the voltage and current signals

Var

Internal Circuit of the Component

Example Model

This example demonstrates the usage of power calculation with variable frequency block. A 3-phase 240V, 60Hz source connected to a 3kW and 0.6kVar load is demonstrated with a time varying frequency. It can be seen that the power consumed changes with frequency.

Note that the following demo requires that users edit the ScopeView template, and replace the existing .oprec data source with the data generated during the simulation.


Simulation results



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