A novel controlmethod is proposed for the three-phase four-wire four-leg active power filter (APF) to realize the accurate and realtime\ncompensation of harmonic of power system, which combines space vector pulse width modulation (SVPWM) with triangle\nmodulation strategy. Firstly, the basic principle of the APF is briefly described. Then the harmonic and reactive currents are derived\nby the instantaneous reactive power theory. Finally simulation and experiment are built to verify the validity and effectiveness of the\nproposed method.The simulation results show that the response time for compensation is about 0.025 sec and the total harmonic\ndistortion (THD) of the source current of phase A is reduced from 33.38% before compensation to 3.05% with APF.
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