Matrix Bidirectional Phase-Shifted Full-Bridge Converter
Purpose
Bidirectional phase-shifted full-bridge converter with 3-phase matrix converter frontend and optional series capacitor
Library
Electrical / Nanostep
Description
This component implements a bidirectional phase-shifted full-bridge converter with a 3-phase matrix converter frontend and free-wheeling on the low voltage side. 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 or shoot-through of the secondary-side DC link are not permitted. Additionally, the secondary-side DC voltage must never become negative.
Parameters
- 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 scalar specifying the capacitance of the series capacitor, in farads \((\mathrm{F})\).
- 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 low voltage side filter inductance, 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 tooff, 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. 270 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.
- Freewheeling current
The current flowing through the snubber switch, from the converter to the low voltage side.
- Capacitor voltage
The voltage across the series capacitor.
- Primary gate signals
A vector for each phase containing the gate signals of the primary side semiconductor switches.
- Secondary gate signals
A vector containing the gate signals of the secondary side semiconductor switches.
- Snubber gate signal
The gate signal of the snubber semiconductor switch.
Fig. 270 Nanostep Probe Signals for the 3x1 Matrix Bidirectional Phase-Shifted Full-Bridge Converter