Application of PR control in restraining DC magnetic bias for output transformer of inverter
ZHANG Haiyu，WANG Zhengshi，CHEN Huiming
(College of Electrical Engineering，Zhejiang University，Hangzhou 310027，China)
Abstract: The inverter itself, output transformer and AC loads would be influenced greatly by DC magnetic bias for output transformer of inverter which threatens the reliable operation of inverter seriously. Thus, aiming at DC magnetic bias for output transformer of inverter, a simple and applied approach involving PR control achieved by digital signal processor(DSP) was proposed，and according to theoretical researches, the effectiveness was verified by a 50 Hz／3 kW single phase inverter.The experimetal results show that, the effectual restraint of DC magnetic bias for output transformer of inverter can be accomplished successfully. The good performances of dynamic and steady characteristics of the control system are ralized. Its effectiveness is demonstrated through both of them.
Key words: inverter；transformer；PR control；DC magnetic bias；digital signal processor （DSP）