Sample Time Staggered One-Cycle Control Based on Three-Phase H-bridge Cascade VSI

The One-Cycle Control(OCC) technique not only provides fast dynamic response, but also can admirably suppress the perturbation yielded by dc source and eliminate the undesired harmonic contents. The cascade H-bridge VSI has very low dv/dt and distortion in the voltage output waveform. Sample time staggered one-cycle control (STS-OCC) based on three-phase H-bridge cascade VSI is proposed. It yields all of the advantages of the OCC and cascade VSI. The results of the simulation and analysis show that the STS-OCC technology has high equivalent work frequency, little switching loss and quick dynamic response speed, which means it is fit for the cascaded multilevel inverter.