﻿ APF中完美谐波消除法的仿真与分析

# APF中完美谐波消除法的仿真与分析Simulation and Analysis of the Perfect Harmonic Cancellation Method for APF

Abstract: Harmonic detection is one of the most important control strategies in active power filter (APF). When the grid voltage is under distorted or unbalanced circumstance, the harmonic detection of APF causes error using the conventional harmonic detection methods, and the compensation effect is unsatisfactory. The compensating current equation of the perfect harmonic cancellation (PHC) is derived based on Instantaneous Reactive Power Theory in the paper. The PHC method uses positive sequence components of the grid voltage without the effect of distortion and unbalance while detecting harmonic. It makes for error reduction. Finally, the PHC method is simulated in the paper when the grid voltage is under normal circumstance or distorted and unbalanced circumstance. The simulation results verify that the APF using the PHC method has more satisfied compensation effect when the grid voltage is under distorted and unbalanced circumstance, and it proves that the PHC method is correct and superior.

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