Space Vector Based Hysteresis Control Strategy ...

A space vector based hysteresis control strategy with fixed switching frequency for Unified Power Quality Conditioner (UPQC) is proposed. This method researches the hysteresis control strategy with fixed switching frequency. On this basis, it combines the hysteresis control strategy with fixed switching frequency and space vector control by the conversion of the filter hysteresis tracking control. In the final control strategy, it judges the region of command voltage vector by using the sign of phase-to-phase current error vector . Compared with the traditional current tracking algorithm, detection of three-phase grid voltage is not needed and the algorithm is optimized. The control strategy can solve the problem that switch frequency is unstable and overcome the problem of interphase interference in three-phase three-wire system. Through the MATLAB/Simulink simulation, proved that this kind of control strategy for Unified Power Quality Conditioner proposed in this paper is feasible and effective.