| Eliminating harmonic pollution and improving power factor are a very important research task in the field of power electronics. Silicon-controlled rectifiers (SCR) are widely used in Battery Charger/Discharger System at the present time. As we all know, SCR system has low power factor in grid side and causes severe harmonic pollution. A new solution of Battery Charger/Discharger System base on Voltage-source PWM Rectifier (VSR) is presented in this paper. It will implement bidirectional power flow, sinusoidal current control and unit power factor control in grid side as well. On the basis of deriving the VSR's mathematical model, the MATLAB simulation model is achieved, control strategies of VSR are summarized and their features are pointed out. The feedforward and decoupling control, based on active and reactive current, as a kind of direct current control strategy, is selected by comparing with other ways in this paper. The voltage space vector (SVPWM) is selected as the PWM method, its theory and computing steps are described in detail in this paper. The whole simulation module of control system is built up under the powerful MATLAB/SIMULINK platform, it can precisely reflect the system properties. A full solution of hardware and software design of VSR control system base on DSP56F803 is presented in detail in this paper. Experiment of full-load of the system also testified that the use of three-phase VSR in Battery Charger/Discharger System is available.
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