MODEL-PREDICTIVE VIRTUAL VOLTAGE VECTOR CONTROL-BASED METHOD FOR SUPPRESSING CIRCULATION OF INVERTER

摘要

The present invention relates to a model-predictive virtual voltage vector control-based method for suppressing the zero-sequence circulation of a three-level NPC inverter: by means of analyzing the space vectors of a three-level inverter, selecting from thereamong seven voltage vectors the zero-sequence circulation contribution of which is zero as basic vectors, and by means of synthesizing same into 12 virtual voltage vectors, the zero-sequence circulation of a parallel system is effectively suppressed while also significantly reducing the distortion rate of output current thereof. The quality of grid-connected current is improved, and the method is very suitable for a three-level inverter system that operates parallelly.