基于双闭环控制的三相PWM整流充电技术研究

随着环境污染和资源短缺问题日趋严重，电动汽车的研究备受人们的关注。而研究电动汽车中蓄电池充电装置及充电技术对于推动电动汽车产业发展具有一定的意义。传统的充电装置通常采用三相不可控整流器和DC-DC变换器组成，此类充电装置使得网侧谐波电流大且变换效率低。本文采用双闭环控制的三相PWM（脉宽调制）整流器作为充电装置，其中电流内环可提高网侧功率因素，电压外环可稳定输出的直流电压。为缩短蓄电池充电时间，电压外环参考电压设置为蓄电池浮充电压，使得充电电流的变化符合其充电接收曲线。最后在MATLAB／SIMULINK中搭建仿真模型，验证该控制策略的可行性。

Study on the Charging Technology of Three-phase PWM Rectifier Based on Double Closed Loop Control

With serious environment pollution and resource shortage, research on electric vehicles has attracted much attention, and it is of great significance to do research on the battery charging device and the charging technology which will be helpful for promoting the development of electric vehicles. The traditional charging device usually consists of three-phase non-controllable rectifier and DC-DC converter, and this device can cause big harmonic current and low converting efficiency. In this essay, three-phase PWM rectifier through double closed loop control is used as the charging device, of which the inner current loop can raise the grid side power and the outer voltage loop can stabilize the direct voltage. In order to cut the battery charging time, the reference voltage of the outer loop is set to floating voltage of the battery, by which the change of charging current can match the charging curve. Finally, the simulation model is constructed in MATLAB/SIMULINK to approve the feasibility of this strategy.