Matrix CLLLC Converter
Purpose
CLLLC converter with 1/2/3/4-phase matrix converter frontend
Library
Electrical / Nanostep
Description
This help page applies to a set of components implementing isolated, resonant CLLLC converters with a 1-, 2-, 3-, or 4-phase matrix front-end. The topology can be configured as a dual active bridge (DAB) by omitting the resonant capacitors, or as an LLC converter by omitting the secondary-side inductor and capacitor.
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 capacitors or voltage sources. 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
- Primary leakage inductance
A non-zero scalar specifying the transformer leakage inductance of the primary side, in henries \((\mathrm{H})\).
- Primary winding resistance
A scalar specifying the winding resistance of the primary side, in ohms \((\Omega)\).
- Include primary capacitor
Allows you to include (
yes) or remove (no) a resonant capacitor at the primary side.- Primary resonant capacitance
If the Include primary capacitor option is set to
yes, this parameter requires a non-zero scalar for the resonant capacitance on the primary side, in farads \((\mathrm{F})\).- Magnetizing inductance
A non-zero scalar specifying the magnetizing inductance of the transformer, referred to the primary side, in henries \((\mathrm{H})\).
- Include secondary inductance
Allows you to include (
yes) or remove (no) a leakage inductance on the secondary side.- Secondary leakage inductance
If the Include secondary inductance option is set to
yes, this parameter requires a non-zero scalar specifying the transformer leakage inductance of the secondary side, in henries \((\mathrm{H})\).- Secondary winding resistance
A scalar specifying the winding resistance of the secondary side, in ohms \((\Omega)\).
- Include secondary capacitor
Allows you to include (
yes) or remove (no) a resonant capacitor at the secondary side.- Secondary resonant capacitance
If the Include secondary capacitor option is set to
yes, this parameter requires a non-zero scalar for the resonant capacitance on the secondary side, in farads \((\mathrm{F})\).- Turns ratio
A scalar specifying the ratio of primary-side turns to secondary-side turns.
- 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 currents
The currents flowing into the primary and secondary sides of the transformer.
- Magnetizing current
The current through the magnetizing inductor, referred to the primary side.
- Capacitor voltages
The voltages across the resonant capacitors.
Nanostep Probe Signals
See Fig. 271 for the Nanostep probe signal positions.
- Inductor currents
A vector containing the currents flowing into the primary and secondary sides 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.
- Secondary current
The current flowing from the secondary DC link into the converter.
- Capacitor voltages
A vector containing the voltages across the resonant capacitors.
- 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.
Fig. 271 Nanostep Probe Signals for the 3x1 Matrix CLLLC Converter