摘要：At present, the issue of low power factor and harmonic pollution in traditional charge-discharge system is serious, with the development of PWM rectifier technology, A novel main circuit topology of charge-discharge system with a three-phase voltage source PWM rectifier (VSR) and Bi-directional DC-DC converter are applied in this paper. It can be used as battery charging power supply, but also as a discharge load of battery. Regenerative energy is feedback to power grid and the purpose of energy-saving and environmental protection are attained. A charge-discharge simulation model based on constant-current-constant-voltage (CC-CV) charge/ constant-current discharge is established. Simulation results show compared with the traditional charge-discharge system, the novel charge-discharge system can achieve sinusoidal input currents and has lower harmonic pollution, and at the same time complete discharge process of energy to feedback to power gird.
关键词：battery charging and discharging;PWM rectifier;Bi-directional DC-DC converter;power factor
