Simple Dual Active Bridge
Purpose
Dual active bridge converter without magnetizing inductance
Library
Electrical / Nanostep
Description
This component implements an isolated dual active bridge (DAB) converter with an optional resonant capacitor. For a DAB with magnetizing inductance, refer to the CLLLC Converter.
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 1, which means it occupies 1/3 of a 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
The Nanostep implementation cannot simulate a shoot-through or clamping of the DC sides. Therefore, the gate signals for the upper and lower switch in the same leg must never both become true at the same time. Also, the applied DC voltages must never become negative.
Parameters
- Semiconductor symbol
This setting lets you choose between
IGBTandMOSFETfor the symbol of the active semiconductor switches. It does not change the electrical behavior of the converter in simulation.- Include resonant capacitor
Allows you to include (
yes) or remove (no) the resonant capacitor.- Inductance
A non-zero scalar specifying the transformer leakage inductance, referred to the primary side, in henries \((\mathrm{H})\).
- Winding resistance
A scalar specifying the winding resistance, referred to the primary side, in ohms \((\Omega)\).
- Turns ratio
A scalar specifying the ratio of primary-side turns to secondary-side turns.
- Resonant capacitance
If the Include resonant capacitor option is set to
yes, this parameter requires a non-zero scalar for the resonant capacitance, in farads \((\mathrm{F})\).- Assertions
When set to
on, the block will flag an error if both gate signals in any of the four half-bridges become true.
Probe Signals
- Inductor current
The current flowing into the primary side of the transformer.
- Capacitor voltage
The voltage across the resonant capacitor.
Nanostep Probe Signals
See Fig. 274 for the probe signal positions.
Fig. 274 Probes for the Simple Dual Active Bridge
- Inductor current
The current flowing into the primary side of the transformer.
- Capacitor voltage
The voltage across the resonant capacitor.
- Primary current
The current flowing from the primary DC link into the converter.
- Secondary current
The current flowing from the secondary DC link into the converter.
- Primary gate signals
A vector 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.