Parallel and Series Load and RLC Branches.

There are several series and parallel combinations of RLC components to create electrical loads, or to be used as series and/or parallel branches. The dynamic models are convenient when you want to specify the active and reactive power of the load, without specifying the RLC parameters yourself.

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All blocks are supplied as single and three phase models.


Parallel and Series Branch

Parallel branch The Parallel RLC branch block implements a linear load as a parallel combination of RLC elements. The values of R, C and L have to be specified.

Series branch The Series RLC Branch block implements a linear branch as a series combination of R L C elements. The values of R, C and L have to be specified.

Branch parameters

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Branch Parameters
ParameterDefaultFunction
R1[Ohm]Branch resistance.
L1m[Henry]Branch inductance.
C1u[Farad]Banch capacitance.


Parallel and Series Load

Parallel load The Parallel RLC Load block implements a linear load as a parallel combination of RLC elements. At the specified frequency, the load will exhibit a constant impedance and its power will be proportional to the square of the applied voltage.

Series load The Series RLC Load block implements a linear load as a series combination of R L C elements. At the specified frequency, the load will exhibit constant impedance and its power will be proportional to the square of the applied voltage.

Load parameters

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Load Parameters
ParameterDefaultFunction
F50[Hz]The nominal frequency, in Hertz (Hz).
P1000[Watt]The active power of the load, in watts.
QL100[Var]The inductive reactive power QL, in vars. Specify a positive value, or zero.
QC100[Var]The capacitove reactive power QC, in vars. Specify a positive value, or zero.
Vn230[Vrms]The nominal voltage of the load, in volts rms (Vrms).


Dynamic Parallel and Series Load

The difference with the previous parallel and series load is that the active and reactive power can be controlled. The values for the active and reactive power have to be connected to the appropriate inputs of the blocks.

Parallel load The Parallel RLC Load block implements a linear load as a parallel combination of RLC elements. At the specified frequency, the load will exhibit a constant impedance and its power will be proportional to the square of the applied voltage.

Series load The Series RLC Load block implements a linear load as a series combination of R L C elements. At the specified frequency, the load will exhibit constant impedance and its power will be proportional to the square of the applied voltage.

Load parameters

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Load Parameters
ParameterDefaultFunction
F50[Hz]The nominal frequency, in Hertz (Hz).
Vn230[Vrms]The nominal voltage of the load, in volts rms (Vrms).

Load Inputs
InputFunction
PThe active power of the load, in watts.
QLThe inductive reactive power QL, in vars. Specify a positive value, or zero.
QCThe capacitove reactive power QC, in vars. Specify a positive value, or zero.

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