面向直流配电网的双有源全桥的PID控制

Dual Active Full Bridge PID Control for DC Distribution Network

随着直流配电网的快速发展,作为其关键设备的双有源全桥也成为研究的热点。本文针对双有源全桥的输出电压误差较大,对负载阶跃变化的动态响应较慢等问题提出了采用PID调节的闭环控制的方法,为方便说明,以单移相调制的CLLC谐振型双有源全桥为例进行仿真,分别用开环和闭环控制来观察其输出电压,负载电流等波形,证明了上述方法可以对直流变压器的输出电压进行精确控制或是在某一范围内对输出电压进行控制,同时使系统动态运行较稳定,且进入稳态时间较短。为今后入研究直流配电网的变换器拓扑及控制方法打好了基础。

With the rapid development of DC distribution network, the double active full bridge, as its key equipment, has become a research hotspot. Based on the problem of the large output voltage error of dual active bridge and the slow dynamic response to load step change, the method of the PID closed-loop control is proposed. For the convenience of description, taking CLLC-type dual active bridge in a single phase shift modulation type as an example, the simulation respectively uses open loop and closed loop control to observe its output voltage and load current waveform, which proves that the method can precisely control the output voltage of the DC transformer or control the output voltage within a certain range, at the same time make the system dynamic operation stable, and shorter time to be in a steady state. It lays a foundation for further research on distribution network topology and control methods.