Question
What toolboxes and control blocks are required to design a 3-Phase Shunt Active Power Filter (APF) in Simulink for THD reduction?
Expert Answer
Neeta Dsouza
PhD Expert
Answered Aug 26, 2026
Simulating an Active Power Filter (APF) in Simulink requires Simscape Electrical and Control System Toolbox.
Core Blocks Needed:
- Non-Linear Load: 3-Phase Universal Bridge Rectifier feeding an RL load.
- Harmonic Extraction: Synchronous Reference Frame (p-q or d-q theory) block to isolate harmonic current components.
- Hysteresis Current Controller / SPWM: Generates gate pulses for the 3-phase VSC inverter.
- Powergui: Set to Continuous or Discrete mode (50 μs sample time) with FFT Analysis tool enabled to measure THD before and after filtering.
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