Abstract
Dominant Harmonic Active Filter (DHAF) based on square-wave inverters is proposed to cost-effectively meet IEEE 519 harmonic current limits for 12 pulse rectifier loads. This system employs square-wave inverters switching at 5 th and 7 th harmonic frequencies, thus eliminating the need for large kVAR rated and bulky 5 th and 7 th passive filters. Simulation results validate the harmonic isolation feature of DHAF at 5th and 7th harmonic frequencies.