基于SVPWM技术的双向蓄电池充放电系统设计

Design of a bidirectional battery charging and discharging system based on SPWM technology

针对传统蓄电池充放电系统采用直流开关电源加电阻箱以及晶闸管相控等的缺点,设计了一种可双向工作、且高效率、高功率因数的系统。该系统主要由三相VSR和DC/DC变换器两部分。当需要对蓄电池充电时,DC/DC变换器就工作于降压方式,将VSR输出电压降为合适的电压对蓄电池充电;当蓄电池需要放电时,DC/DC变换器就工作于升压方式,将蓄电池能量通过VSR逆变,再经变压器升压和滤波后回馈电网。最后通过设计的样机进行测试。结果表明,能根据需要实现充放电状态或者人工进行转变,特别在实现能量双向流动的同时,网侧电流波形得到正弦波控制和网侧功率因数接近1。

In view of the disadvantages of traditional battery charge and discharge system, which puts to use the switch power and DC resistance box and thyristor phase control, a system is designed that could work bi-directionally, with higher efficiency and higher power factor. The system mainly composes of two parts, three-phase VSR and DC/DC in- verter. When the battery needs to charge, the DC/DC converter will work on the buck mode, and the output voltage will be reduced to the appropriate voltage for battery charging; When the battery needs to discharge, the DC/DC in- verter will work on a boost way, and the battery energy could be contra-variant on VSR, then, there must be feedback the power grid by step-up transformer and filtering. Finally, we make a test through a designed prototype. The results show that it can achieve the status by charging and discharging or manually change according to the needs, especially in the implementation of two-way flow of energy at the same time, then, the current waveform of network side will be controlled by sinusoidal wave, and the power factor may be close to 1.