RLC (Three-Phase)

Three-phase impedance

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  • RLC (Three-Phase) block

Description

The RLC (Three-Phase) block models a three-phase impedance with two three-phase connections. Each of the three identical impedance components can include any combination of a resistor (R), capacitor (C), and inductor (L), connected in series or in parallel.

Define the values for the R, L, and C components by specifying the appropriate block parameters. Do not set the parameter values to zero or infinity to remove terms; instead, select the correct option for the Component structure parameter.

For certain combinations of R, L, and C, for some circuit topologies, specify parasitic resistance or conductance values that help the simulation to converge numerically. These parasitic terms ensure that an inductor has a small parallel resistive path and that a capacitor has a small series resistance.

Block parameterization

The following two tables list the block parameters for each Component structure, based on the selected Parameterization option:

  • Specify by rated power

  • Specify component values directly

Component StructureMain ParametersParasitics ParametersInitial Conditions Parameters

R

Resistance

None

None

L

Inductance

Parasitic parallel conductance

Initial inductor current [ Ia Ib Ic ]

C

Capacitance

Parasitic series resistance

Initial capacitor voltage [ Va Vb Vc ]

Series RL

Resistance

Inductance

Parasitic parallel conductance

Initial inductor current [ Ia Ib Ic ]

Series RC

Resistance

Capacitance

None

Initial capacitor voltage [ Va Vb Vc ]

Series LC

Inductance

Capacitance

Parasitic parallel conductance

Initial inductor current [ Ia Ib Ic ]

Initial capacitor voltage [ Va Vb Vc ]

Series RLC

Resistance

Inductance

Capacitance

Parasitic parallel conductance

Initial inductor current [ Ia Ib Ic ]

Initial capacitor voltage [ Va Vb Vc ]

Parallel RL

Resistance

Inductance

None

Initial inductor current [ Ia Ib Ic ]

Parallel RC

Resistance

Capacitance

Parasitic series resistance

Initial capacitor voltage [ Va Vb Vc ]

Parallel LC

Inductance

Capacitance

Parasitic series resistance

Initial inductor current [ Ia Ib Ic ]

Initial capacitor voltage [ Va Vb Vc ]

Parallel RLC

Resistance

Inductance

Capacitance

Parasitic series resistance

Initial inductor current [ Ia Ib Ic ]

Initial capacitor voltage [ Va Vb Vc ]

Variables

Use the Variables tab to specify the priority and initial target values for the block variables before simulation. For more information, see Set Priority and Initial Target for Block Variables.

The Variables tab is not visible if you set Component structure to R.

Ports

Conserving

expand all

Expandable three-phase port.

Expandable three-phase port.

Parameters

expand all

Main

Select the desired combination of a resistor (R), capacitor (C), and inductor (L), connected in series or in parallel.

Resistance of each of the line impedances.

Dependencies

This parameter is visible only when you select a component structure that includes a resistor.

Inductance of each of the line impedances. This parameter is visible only when you select a component structure that includes an inductor.

Dependencies

This parameter is visible only when you select a component structure that includes an inductor.

Capacitance in each of the line impedances.

Dependencies

This parameter is visible only when you select a component structure that includes a capacitor.

Parasitics

Represents small parasitic effects. The parameter value corresponds to the series resistance value added to all instances of capacitors in the load.

Represents small parasitic effects. The parameter value corresponds to the parallel conductance value added across all instances of inductors in the load.

Model Examples

Power-Loss Analysis of a Three-Phase Rectifier

Power-Loss Analysis of a Three-Phase Rectifier

Perform a power-loss analysis using the ee_getPowerLossSummary function and the power_dissipated variable. The Rectifier contains six Diode blocks. Diodes D1, D2, D4, and D5 each dissipate, on average, 52.19 W over the course of the 0.5 second simulation. Diodes D3 and D6 each dissipate an average of 52.22 W for the same time period because they experience a 340 W transient power-dissipation spike due to DC-load capacitor charging before t = 1e-3 s. For each diode, the average power dissipated when the rectifier is operating in steady-state, t = 0.4 to 0.5 s, is 52.19 W.

Three-Phase Asynchronous Machine Starting

Three-Phase Asynchronous Machine Starting

Model a wye-delta starting circuit for an induction machine. When the supply is connected to the machine via switch S1, switch S2 is initially off resulting in the machine being connected in a wye configuration. Once the machine is close to synchronous speed, switch S2 is operated thereby reconnecting the machine in a delta configuration. The higher impedance seen by the supply when the motor is in wye configuration reduces the starting current, and causes less disruption to other connected loads.

Extended Capabilities

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

See Also

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Topics

Introduced in R2013b

Simscape Electrical Documentation

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