Open Circuit (Three-Phase)

Three-phase terminator that draws no current

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Description

The Open Circuit (Three-Phase) block models a three-phase connection that draws no current on any of the three phases.

Ports

Conserving

~ — Three-phase port

electrical

Expandable composite (a,b, c) three-phase port

Model Examples

Earthing Effects with Unbalanced Load

The effects of three different types of earthing connections on network voltages and currents.

Three-Phase Three-Level PWM Generator

Use the PWM Generator (Three-phase, Three-level) to control a Three-Level Converter. The upper and lower supply voltages are input to a Neutral point controller, which balances the DC-link capacitor voltages. Reference AC waveforms are used as inputs to the PWM Generator. There is one time scope for the controller waveforms.

Three-Phase Bridge Cycloconverter

A three-phase bridge cycloconverter. The cycloconverter consists of 36 thyristors and has the capacity to lower the frequency of the input voltage. The Control subsystem implements the cycloconverter RMS voltage control. It also provides pulse generation for the firing of the thyristors. The Visualization subsystem contains scopes that allow you to see the simulation results. The simulation time, t, is 1 second. The load increases when Load1 switches on at t = 0.75 seconds.

Three-Phase Voltage-Sourced Converter (FLB)

Model a three-phase voltage-sourced converter that uses Fixed Low-side Bias (FLB) modulation. This modulation scheme minimises the switching in the converter as at any given time one phase is not being pulse modulated. The trade-off is the need for narrower pulses for a given level of acceptable harmonics. The model can be used to support selection of suitable values for L, C and the pulse modulation scheme parameters.

Compatibility Considerations

Capping unconnected ports is no longer required

Behavior changed in R2019b

This block is no longer required. Starting in R2019b, the restriction that disallowed unconnected conserving ports in Simscape™ models has been lifted. Now, if you leave a conserving port unconnected, the physical network sets all the Through variables at this port to 0. However, you can still use terminator blocks to improve diagram readability.

There are no plans to remove the terminator blocks. All the existing models using these blocks work the same as in previous releases.

Extended Capabilities

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