Question
What toolboxes and control blocks are required to design a 3-Phase Shunt Active Power Filter (APF) in Simulink for THD reduction?
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Expert Answer
Neeta Dsouza
PhD Expert
Answered Aug 8, 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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