Wye-Connected Variable Load (Lagging)
A three-phase variable load connected according to the Star scheme.
blockType: AcausalElectricPowerSystems.Passive.RLC_Assemblies.WyeConnectedVariableLoadLagging
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Description
The Wye-Connected Variable Load (lagging) block simulates a variable active-inductive three-phase load connected according to the Star scheme. Each phase of the load contains a resistor R and the inductor L. The unit calculates the resistance and inductance required for the selection of active and reactive power, set values at the Inputs P and Q at rated voltage and rated frequency. Thus, the unit can represent an active-inductive load.
To ensure that the resistance and inductance are always greater than zero, specify the minimum active and reactive power that the load consumes. These values must be greater than zero.
Equations
The series resistance and inductance of each phase are determined as follows:
,
Where:
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— sequential resistance of each phase.
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— sequential inductance of each phase.
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— RMS rated line voltage.
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— rated electrical frequency of alternating current.
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— The required three-phase real power.
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— Required three-phase reactive power.
Inductance is defined as the ratio of magnetic flux to steady-state current:
.
Therefore, the dependence of current on voltage for an inductor has the form:
.
Ports
Parameters
Main
Rated voltage — rated line voltage
24e3 V (by default)
The RMS value of the nominal line voltage for the resistance equation.
Rated electrical frequency — rated electrical frequency
50 Hz (by default)
The nominal or conditional frequency of the AC network to which the transformer is connected. The value must be greater than 0.
Minimum real power — minimum active power
1e3 W (by default)
The minimum active power that a three-phase load dissipates when the rated voltage is applied. The value must be greater than 0.
Minimum reactive power — minimum reactive power
1e3 IN*A (by default)
The minimum reactive power consumed by a three-phase load when the rated voltage is applied. The value must be greater than 0.