Three-Phase Series RLC Load
Implement three-phase series RLC load with selectable connection
Libraries:
Simscape /
Electrical /
Specialized Power Systems /
Passives
Description
The Three-Phase Series RLC Load block implements a three-phase balanced load as a series combination of RLC 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.
Ports
Conserving
A — Phase A
specialized electrical
Specialized electrical conserving port associated with phase A.
B — Phase B
specialized electrical
Specialized electrical conserving port associated with phase B.
C — Phase C
specialized electrical
Specialized electrical conserving port associated with phase C.
N — Neutral
specialized electrical
Specialized electrical conserving port associated with the neutral.
Dependencies
To enable this port, set Configuration to
Y (neutral)
.
Parameters
To edit block parameters interactively, use the Property Inspector. From the Simulink® Toolstrip, on the Simulation tab, in the Prepare gallery, select Property Inspector.
Parameters
Configuration — Connection of three phases
Y(grounded)
(default) | Y(floating)
| Y(neutral)
| Delta
The connection of the three phases. Select one of the following four connections:
| Neutral is grounded. |
| Neutral is not accessible. |
| Neutral is made accessible through a fourth connector. |
| Three phases connected in delta |
The block icon is updated according to the load connection.
Nominal phase-to-phase voltage Vn — Nominal phase-to-phase voltage of Ioad
1000
(default)
Nominal phase-to-phase voltage of the load, in volts RMS (Vrms).
Dependencies
To enable this parameter, clear the Specify PQ powers for each phase parameter.
Nominal phase-to-neutral voltages [Va Vb Vc] (Vrms) — Nominal phase-to-neutral voltages of load
[1e3 1e3 1e3]
(default)
Nominal phase-to-neutral voltages of the load, in volts RMS (Vrms).
Dependencies
To enable this parameter, select the Specify PQ powers for each phase parameter.
Nominal frequency fn (Hz) — Nominal frequency
60
(default)
The nominal frequency, in hertz (Hz). Default is
60
.
Specify PQ powers for each phase — Option to specify PQ powers for each phase
off
(default) | on
Option to specify active powers, inductive reactive powers, and capacitive reactive powers for each phase of the load.
Active power P (W) — Three-phase active power of load
10e3
(default)
Three-phase active power of the load, in watts.
Dependencies
To enable this parameter, clear the Specify PQ powers for each phase parameter.
Inductive reactive power QL (positive var) — Three-phase inductive reactive power QL
100
(default) | nonnegative scalar
Three-phase inductive reactive power QL, in vars.
Dependencies
To enable this parameter, clear the Specify PQ powers for each phase parameter.
Capacitive reactive power QC (negative var) — Three-phase capacitive reactive power QC
100
(default) | nonnegative scalar
Three-phase capacitive reactive power QC, in vars.
Dependencies
To enable this parameter, clear the Specify PQ powers for each phase parameter.
Active powers [Pa Pb Pc] (W): — Three-phase active power of load
[10e3 9e3 11e3]
(default) | vector of three nonnegative elements
Three-phase active power of the load, in watts. You can specify different powers for each phase, including 0.
Dependencies
To enable this parameter, select the Specify PQ powers for each phase parameter.
Inductive reactive powers [QLa QLb QLc] (positive var): — Three-phase inductive reactive power QL
[100 90 110]
(default) | vector of three nonnegative elements
Three-phase inductive reactive power QL, in vars. You can specify different powers for each phase, including 0.
Dependencies
To enable this parameter, select the Specify PQ powers for each phase parameter.
Capacitive reactive powers [QCa QCb QCc] (negative var): — Three-phase capacitive reactive power QC
[100 90 110]
(default) | vector of three nonnegative elements
Three-phase capacitive reactive power QC, in vars. You can specify different powers for each phase, including 0.
Dependencies
To enable this parameter, select the Specify PQ powers for each phase parameter.
Measurements — Type of measurements
None
(default) | Branch voltages
| Branch currents
| Branch voltages and currents
Select Branch voltages
to measure the three
voltages across each phase of the Three-Phase Series RLC Load block
terminals. For a Y connection, these voltages are the phase-to-ground or
phase-to-neutral voltages. For a delta connection, these voltages are
the phase-to-phase voltages.
Select Branch currents
to measure the three
total currents (sum of R, L, C currents) flowing through each phase of
the Three-Phase Series RLC Load block. For a delta connection, these
currents are the currents flowing in each branch of the delta.
Select Branch voltages and currents
to
measure the three voltages and the three currents of the Three-Phase
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 measurements are identified by a label followed by the block name.
Measurement | Label | |
---|---|---|
Branch voltages | Y(grounded) |
|
Y(floating) |
| |
Y(neutral) |
| |
Delta |
| |
Branch currents | Y(grounded) |
|
Y(floating) |
| |
Y(neutral) |
| |
Delta |
|
Load Flow
Load type — Option to specify load type
constant Z
(default) | constant PQ
| constant I
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 are therefore varying 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 the
Apply button of 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 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 are therefore varying proportionally to the bus
voltage computed by the Load Flow tool. When you apply the load flow
solution to the model (by clicking the Apply
button of the Load Flow tool), the p.u. 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
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