A 3-PHASE SINE-WAVE INVERTER SYSTEM USING MULTIPLE PHASE-SHIFTED SINGLE-PHASE RESONANT INVERTERS

Two novel systems to synthesize three-phase sine waves with a combinat ion of two units, using multiple phase-shifted single-phase resonant i nverters are proposed. The first system has the advantages of both a h igh-frequency resonant inverter and a high-frequency ac link. The seco nd system has the advantage of a high-frequency resonant inverter. The structure and operating principles of both proposed systems are descr ibed and their features are compared with a conventional 12-step inver ter. The simulated and experimental results show that the proposed sys tems have excellent characteristics and give high-quality output wavef orms.