Analysis and control of integrated DC bus voltage conditioner for cascade power converter system

A bidirectional integrated bus voltage conditioner (IBVC) is proposed for isolated phase shifted full bridge (PSFB) DC-DC converter to improve the DC bus voltage stability in cascaded power converter system. In this method, the load converter is controlled tightly with high control bandwidth. Unlike those separate converter based DC bus voltage stabilization methods with auxiliary switches, multiplexing utilization of the existing full bridge switches on the primary side is adopted for the proposed method. In this strategy, phase shift control and duty cycle regulation have been applied for both legs of PSFB. Control-oriented analysis and IBVC parameter design method are also presented. The proposed method is examined through simulation tests and the results are presented.