Comprehensive analysis and design for one cycle controlled DC side APF

One-cycle control(OCC) theory is widely used in the control of APF because of its simple structure and free of complex digital computing process.The DC side active power filter(APF) is shunted at the DC side of rectifier bridge, which has great technical advantages in harmonic suppressing for rectifier load.The circuit topology and basic principle of DC side APF by OCC are first analyzed,then the estimated formulas and design to determine the main circuit parameters,such as the APF inductor,the DC side capacitor of APF,are given in this paper.The large signal model for DC side APF is derived based on energy balance,then the design for PI controller about APF's control system is accomplished,and the control system is corrected to be typical type Ⅱ which can eliminate the steady error and improve the anti-disturbing ability.The paper gives the theoretical basis to comprehensively design the DC side APF.The theoretical analysis and design are verified by prototype experiments.