Implement linear series RLC load
Simscape / Electrical / Specialized Power Systems / Fundamental Blocks / Elements
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.
The nominal voltage of the load, in volts RMS. Default is
1000
.
The nominal frequency, in hertz. Default is 60
.
The active power of the load, in watts. Default is 10e3
.
The inductive reactive power QL, in vars. Specify a positive value, or 0. Default is
100
.
The capacitive reactive power QC, in vars. Specify a positive value, or 0. Default is
100
.
If selected, the initial capacitor voltage is defined by the Capacitor initial voltage parameter. If cleared, the software calculates the initial capacitor voltage in order to start the simulation in steady-state. Default is cleared.
The Set the initial capacitor voltage parameter have no effect on the block if the capacitive reactive power is equal to zero.
The initial capacitor voltage used at the start of the simulation. The Capacitor initial voltage parameter have no effect on the block if
the capacitive reactive power is equal to zero and if the Set the
initial capacitor voltage parameter is cleared. Default is
0
.
If selected, the initial inductor current is defined by the Inductor initial current parameter. If cleared, the software calculates the initial inductor current in order to start the simulation steady-state. Default is cleared.
The Set the initial inductor current parameter have no effect on the block if the inductive reactive power is equal to zero.
The initial inductor current used at the start of the simulation. This parameter has no
effect on the block if the inductive reactive power is equal to zero and if the Set the initial inductor current parameter is cleared. Default is
0
.
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.
Default is None
.
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 |
|
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.
Specify the load type. The default value is constant
Z
.
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.
The power_seriesload
example uses a Series RLC Load block to implement a simple load.