基于分数阶PID控制的质子交换膜燃料电池前级功率变换器

Pre-Stage Power Converter of Proton Exchange Membrane Fuel Cell Based on Fractional Order PID Controller

针对质子交换膜燃料电池(PEMFC)输出为大电流、宽电压而难以实际应用的问题,首先提出一种以四开关Buck-Boost变换器为主拓扑的PEMFC预稳压模块,采用双沿开关管触发策略减小电感电流脉动,并基于高频开关网络等效原理建立准确的动态模型;然后设计一种分数阶PID控制器实现模块的稳压补偿,并采用一种随机惯性权重PSO算法整定控制器的参数。仿真与实验结果表明,与整数阶控制器相比,分数阶PID控制器具有更好的补偿效果,在系统参数或结构变化时表现出较强的鲁棒性,所提出的模块具有高效可靠的预稳压功能。

Aiming at the problem that proton exchange membrane fuel cell (PEMFC) is difficult for application with high current and wide voltage output, a pre-regulator module of PEMFC is proposed with four-switch Buck-Boost converter as the main topology in this paper. To reduce the inductor current ripple, a kind of dual-triggered switch strategy is analyzed in detail. And an accurate dynamic model of the main topology is proposed based on the equivalence principle of high frequency switching network. Then a fractional order PID controller is designed for voltage compensation of module, and a stochastic inertia weight PSO algorithm is employed to adjust the parameters of controller. The results of Simulation and experiment show that the compensation effect of fractional order PID controller has better performance than the integer order controller, which has stronger robustness when the system parameters or structure vary. And the designed module can realize the efficient and reliable pre-regulator function.