Closed loop control of DAB converter

Implementing closed-loop control for a Dual Active Bridge (DAB) converter in Simulink involves regulating the output voltage or current.

Step-by-Step in Simulink (Simscape Electrical / Specialized Power Systems)

1. Power Circuit Setup

• Two Universal Bridges (primary and secondary)
• High-Frequency Transformer (with or without leakage inductance modeled)
• Input: DC source
• Output: LC filter + resistive or battery load

2. Output Voltage Measurement

• Use a Voltage Measurement block
• Feed into a Simulink PID Controller (e.g., PI)

3. Reference Input

• Provide a constant (or variable) V_ref input

4. Phase Shift Generation

• PI output → Phase Shift (ϕ) in radians
• Use logic to delay or shift the secondary bridge PWM signals
• Primary: unshifted
• Secondary: delayed by ϕ
• Can use Compare To Time + Pulse Generator + Delay blocks or custom logic to create phase-shifted signals

5. Gate Signal Assignment

• Gate signals go to both Universal Bridges
• Ensure correct polarity and dead time if needed