Matrix Phase-Shifted Full-Bridge Converter

Purpose

Phase-shifted full-bridge converter with 3-phase matrix converter frontend and optional series capacitor

Library

Electrical / Nanostep

Description

This component implements an isolated phase-shifted full-bridge converter with a 3-phase matrix converter frontend. A series DC blocking capacitor is optional.

The converter is simulated with time steps in the single-digit nanosecond range. The required Nanostep solver is available exclusively on the RT Box. Both sides of the converter have current source behavior and must each be connected directly to a capacitor or a voltage source. The implementation has a weight of 3, which means it occupies an entire Nanostep solver. For offline simulation, all power semiconductors in the converter are modeled with ideal switches. The individual switches are controlled with instantaneous logical gate signals. A switch is turned on when the corresponding gate signal is true.

Note

Inductive currents must not be interrupted abruptly. Therefore, at all times, the combination of switch signals on the matrix front-end must provide a path for the inductive current of the primary winding. This can be achieved by ensuring that at least one high-side switch and one low-side switch are simultaneously ON in the direction of the current flow.

The voltage sources connected to the converter terminals must not be short-circuited. Therefore, combinations of switching signals that cause phase-to-phase short circuits at the AC front-end are not permitted. Additionally, the secondary-side DC voltage must never become negative.

Parameters

Output rectifier

This setting lets you choose between center-tapped Half bridge and Full bridge output rectifier topology.

Leakage inductance

A non-zero scalar specifying the primary side leakage inductance of the transformer, in henries \((\mathrm{H})\).

Leakage winding resistance

A scalar specifying the resistance of the primary winding, in ohms \((\Omega)\).

Include series capacitor

Allows you to include (yes) or remove (no) the series capacitor.

Series capacitance

A non-zero scalar specifying the capacitance of the series capacitor, in farads \((\mathrm{F})\).

Include magnetizing inductance

Allows you to include (yes) or remove (no) the magnetizing inductance.

Magnetizing inductance

A non-zero scalar specifying the magnetizing inductance of the transformer, referred to the primary side, in henries \((\mathrm{H})\).

Turns ratio

A scalar specifying the ratio of primary-side turns to secondary-side turns.

Filter inductance

A non-zero scalar specifying the output filter inductance of the rectifier, in henries \((\mathrm{H})\).

Filter resistance

A scalar specifying the low voltage side filter resistance, in ohms \((\Omega)\).

Assertions

When set to on, the block flags an error for combinations of gate signals that cause shoot-through or interruption of inductive currents. When set to off, these errors are not checked during real-time simulation.

Probe Signals

Inductor current

The current flowing into the primary side of the transformer.

Magnetizing current

The current through the magnetizing inductor, referred to the primary side.

Capacitor voltage

The voltage across the series capacitor.

Nanostep Probe Signals

See Fig. 272 for the Nanostep probe signal positions.

Inductor current

The current flowing into the primary side of the transformer.

Magnetizing current

The current through the magnetizing inductor, referred to the primary side.

Primary currents

A vector containing the three-phase currents flowing into the converter.

Filter current

The current through the secondary side filter inductor.

Capacitor voltage

The voltage across the series capacitor.

Gate signals

A vector for each phase containing the gate signals of the primary side semiconductor switches.

Fig. 272 Nanostep Probes for the 3x1 Matrix Phase-Shifted Full-Bridge Converter