Abstract
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.
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