Series RLC Load

Implement linear series RLC load

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Libraries:
Simscape / Electrical / Specialized Power Systems / Passives

Description

The Series RLC Load block implements a linear load as a series combination of R L C elements. At the specified frequency, the load exhibits a constant impedance. The active and reactive powers absorbed by the load are proportional to the square of the applied voltage. Only elements associated with nonzero powers are displayed in the block icon.

Examples

The power_seriesload example uses a Series RLC Load block to implement a simple load.

Ports

Conserving

+ — Positive terminal

specialized electrical

Specialized electrical conserving port associated with the positive terminal.

- — Negative terminal

specialized electrical

Specialized electrical conserving port associated with the negative terminal.

Parameters

Parameters

Nominal voltage Vn (Vrms) — Nominal voltage of load

1000 (default) | nonnegative scalar

Nominal voltage of the load, in volts RMS.

Nominal frequency fn (Hz) — Nominal frequency

60 (default) | nonnegative scalar

Nominal frequency, in hertz.

Active power P (W) — Active power of load

10e3 (default) | scalar

Active power of the load, in watts.

Inductive reactive power QL (positive var) — Inductive reactive power

100 (default) | nonnegative scalar

Inductive reactive power QL, in vars. Specify a positive value, or 0.

Capacitive reactive power Qc (negative var) — Capacitive reactive power

100 (default) | nonnegative scalar

Capacitive reactive power Qc, in vars. Specify a positive value, or 0.

Set the initial capacitor voltage — Option to set the initial capacitor voltage

off (default) | on

Select this option to specify the initial capacitor voltage. If you clear this parameter, the software calculates the initial capacitor voltage in order to start the simulation in steady state.

Capacitor initial voltage (V) — Capacitor initial voltage

0 (default) | scalar

Initial capacitor voltage, in V, to use at the start of the simulation.

Dependencies

To enable this parameter, select the Set the initial capacitor voltage parameter.

Set the initial inductor current — Option to set the initial inductor current

off (default) | on

Select this option to specify the initial inductor current. If you clear this parameter, the software calculates the initial inductor current in order to start the simulation in steady state.

Inductor initial current (A) — Initial inductor current

0 (default) | scalar

Initial inductor current, in A, to use at the start of the simulation.

Dependencies

To enable this parameter, select the Set the initial inductor current parameter.

Measurements — Measurements

None (default) | Branch voltage | Branch current | Branch voltage and current

Measurements to use during simulation.

Select Branch voltage to measure the voltage across the Series RLC Load block terminals.

Select Branch current to measure the current flowing through the Series RLC Load block.

Select Branch voltage and current to measure the voltage and the current of the Series RLC Load block.

Place a Multimeter block in your model to display the selected measurements during the simulation. In the Available Measurements list box of the Multimeter block, the measurement is identified by a label followed by the block name:

Measurement	Label
Branch voltage	Ub:
Branch current	Ib:

Load Flow

The Load Flow tool of the powergui block uses the parameters on this tab. These load flow parameters affect only model initialization. They do not affect simulation.

Load type — Option to specify the load type

constant Z (default) | constant PQ | constant I

Option to specify the load type.

If you select constant Z, the load impedance is determined from the nominal phase-to-phase voltage Vn, active power P, and reactive power (QL-QC) specified on the Parameters tab of the block dialog box. During the load flow solution, the impedance is kept constant. The effective P and Q therefore vary proportionally to the square of the bus voltage computed by the Load Flow tool.

If you select constant PQ, the active power P and reactive power Q are kept constant and equal to the values specified on the Parameters tab of the block dialog box. When you apply the load flow solution to the model (by clicking Apply in the Load Flow tool), the Nominal phase-to-phase voltage Vn parameter on the Parameters tab is automatically adjusted to the phase-to-phase bus voltage computed by the Load Flow tool.

If you select constant I, the load current is kept constant at its nominal value determined from the base voltage specified in the dialog box of the associated Load Flow Bus block and from active power P and reactive power QL and QC specified on the Parameters tab of the block dialog box. The effective P and Q therefore vary proportionally to the bus voltage computed by the Load Flow tool. When you apply the load flow solution to the model (by clicking Apply in the Load Flow tool), the pu value of the nominal voltage Vn on the Parameters tab is automatically adjusted to the square root of the load voltage (in pu) computed by the Load Flow tool.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced before R2006a