| The developing trend of the storage battery system becomes miniature, intelligent, efficient and energy-saving. Direct rectifying or rectifying using thyristors is adopted by most traditional charging-discharging device of storage battery. Though it is used completely technique and low price, it also has many disadvantages. For example, there are low input power factor, low working frequency, and so on.These disadvantages can not satisfy the needs of practical use. With the development of power electronic devices and power control technique, The rectifier based on PWM technique which has the advantages of bidirectional power flow, low AC harmonic and unit power factor is appeared. So a high-efficiency energy-saving PWM rectifier used in storage battery charging and discharging system is presented in this paper.Three-phase PWM rectifier is the main researching object in this paper, and its mathematical model is studied. Then this paper also introduces the fundamental structure of the system which is mainly composed of three-phase PWM rectifier and other components.This paper also introduces the main control circuit which is base on the DSP-TMSS320F2812. The parameters and functions of the devices are analyzed.The control strategy is voltage oriented control, which the double closed loops are selectd to realized.The voltage space vector PWM modulation is aslo introduced.Finally the program is based on the control strategy.The MATLAB simulation model and the experimental results of the system are given in this paper. Those results indicate that good trace performance of input current is realized, the input power factor is close to 1, the output voltage of the converter is stable and high quality battery charge-recharge current which has small ripple is achieved. The system designed satisfies the expect demands.
|
PDF Full Text Request