Study On Three-Phase High Power Factor Corrector Base On Digital One-Cycle Control

With The development of science and technology, the electrical equipment was being widely used, the harmonic pollution in the grid becomes more and more serious, therefore improve the quality of power network and improve system power factor corrector have been focus on to research in our country and abroad. In order to improve the quality of power network, the paper pays more attention on three-phase.Based on referring to lots of the literature, the paper introduced some circuit topologies and control strategies about three-phase, and then the new power factor corrections technologies with one-cycle control are studied. In this paper, one-cycle control is applied in the control of three-phase four-wire power factor correction. First the one-cycle control equation was got by analysis about one-cycle control theory. Then applied one-cycle control to three-phase four wire system, and established an equivalent model under this topology. Based on the theory, the system was designed, including the parameters and compensation of the system. The digital one-cycle control can combine both advantages of one-cycle control and digital control. The DSP is employed as the main controller. With digital one-cycle control, the system software and hardware was designed. After that, the prototype of three-phase four-wire rectifier is designed. Finally, the theory was simulated by MATLAB/Simulink and experimented by the prototype.At last, both MATLAB simulation results and experimental results verify the validity and feasibility of control scheme. The digital control scheme under three-phase four-wire was useful. The rectifier can realize high power factor, THD is low, and the system has good stability and the dynamic tracking characteristic.