Series RLC Load
Implement linear series RLC load
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 

Branch current 

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 phasetophase voltage Vn, active power P, and reactive
power (QLQC) 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 phasetophase voltage Vn parameter on the
Parameters tab is automatically adjusted to the phasetophase
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
See Also
Multimeter  Parallel RLC Branch  Parallel RLC Load  Series RLC Branch
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