Study On Storage Battery's Recharge And Discharge System

Before storage batteries are put into the market, they will be recharged and discharged for many times in the shop in order to get the best performance. Direct rectifying or rectifying using thyristor was adopted by most traditional charge devices. Though it has skilled technique and low price, it also has many disadvantages such as low input power factor and only one-way transformation of energy. At present, the storage battery's recharge and discharge system is controlled by industry coputer, and it is a centralized management method .Once industry coputer doesn't work, all storage batteries controlled by it are damaged, and make the manufacturer suffer losses.Therefore, this thesis presents a scheme for storage battery's recharge and discharge control system based on SPWM bi-directional inverter technique, and designs a control system whose main circuit power device is IGBT, core control chip is TMS320LF2407A, auxiliary control chip is C8051F226, linking mode is CPLD and HMI(human machine interface) is keyboard and LCD. On the basis of systems analysis of work theory and mathematical model, this thesis makes a study of three-phase rectify and invert circuit's theory on its two-way energy conversion and digital control technology, and a control strategy is put forward,and then simulates in Matlab7.0.This thesis brings forward a hardware design scheme for the system's factual requirement based on theory, and analyzes main circuit and control circuit's function. And simulates in hardware platform Multisim8. In the end, it is put into acutual system and acquires the better parameter. Software complement is divide into 3 parts and explains their function respectively, and offer program's flow diagram.At the end of this thesis, the experiment waves of the system are provided.These results indicate that the proposed control scheme can realize good trace performance of input current, is closer to unit power factor, and stabilize the output DC bus voltage.