Floating Neutral (Three-Phase)

Internal floating neutral point for wye-connected network

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Description

The Floating Neutral (Three-Phase) block connects the individual phases of a three-phase system to form a floating neutral point.

Note

If you want to create a neutral point that you can connect to other blocks, use the Neutral Port (Three-Phase) block. If you want to create a neutral point that is connected to ground, use the Grounded Neutral (Three-Phase) block.

Ports

Conserving

~ — Three-phase port

electrical

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

Parameters

Parasitic ground conductance — Parasitic ground conductance

1e-12 1/Ohm (default)

Parasitic conductance to ground. A nonzero value is required for the simulation of some circuit topologies.

Model Examples

Earthing Effects with Unbalanced Load

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

Asynchronous Machine Direct Torque Control

Control an asynchronous machine (ASM) using the direct-torque control method. A PI-based speed controller supplies the torque reference. The direct-torque controller generates the inverter pulses.

Asynchronous Machine Scalar Control

Control the rotor speed in an asynchronous machine (ASM) drive using the scalar V/f control method. The converter transforms a reference speed to a reference electrical frequency. The controller generates reference voltages from the reference frequency by maintaining a constant voltage-to-frequency ratio through scalar V/f control.

Electric Engine Dyno

Model an electric vehicle dynamometer test. The test environment contains an asynchronous machine (ASM) and an interior permanent magnet synchronous machine (IPMSM) connected back-to-back through a mechanical shaft. Both machines are fed by high-voltage batteries through controlled three-phase converters. The 164 kW ASM produces the load torque. The 35 kW IPMSM is the electric machine under test. The Control Machine Under Test (IPMSM) subsystem controls the torque of the IPMSM. The controller includes a multi-rate PI-based control structure. The rate of the open-loop torque control is slower than the rate of the closed-loop current control. The task scheduling for the controller is implemented as a Stateflow® state machine. The Control Load Machine (ASM) subsystem uses a single rate to control the speed of the ASM. The Visualization subsystem contains scopes that allow you to see the simulation results.

Extended Capabilities

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