How to make Bidirectional ac to dc converter

Simulating Bidirectional AC-DC Converter in MATLAB/Simulink

A bidirectional AC-DC converter allows power flow both ways: AC → DC (rectifier/charging) and DC → AC (inverter/grid feed-in), with unity power factor.

Step-by-Step Simulation Guide (Simscape Electrical required)

1. Create New Model: Open Simulink, add Powergui (discrete preferred).
2. Build Power Circuit (Three-phase example):
   • Use Universal Bridge (6 arms, IGBT/Diodes) or Converter (Three-Phase) block.
   • AC side: Three-Phase Source + series inductors (5-10 mH).
   • DC side: Capacitor + load/resistor (e.g., 800V bus).
3. Add Measurements: Voltage/current blocks → Scopes.
4. Implement Control (dq-frame):
   • PLL for grid synchronization.
   • abc → dq transformation.
   • Outer PI loop: DC voltage control → Id* reference.
   • Inner PI loops: Id (active power), Iq=0 (unity PF).
   • Add decoupling/feedforward.
   • dq → abc → PWM (Space Vector or Sinusoidal).
5. Direction Control: Positive Id*/power → rectifier; negative → inverter.
6. Tune & Test:
   • Start with averaged model for fast tuning.
   • Switch to detailed model for harmonics.
   
   
   • Step power reference to test both modes.