基于自适应滑模控制的燃料电池电站输出波形控制策略

Control Strategy in Output Waveform Adjustment of Power Conditioning System for Fuel Cell Power Plant Based on Adaptive Siding Mode Control

为得到与燃料电池电站相适应的输出波形,研究了基于自适应滑模控制的燃料电池电站输出波形控制策略。滑模变结构控制具有响应快、抗干扰等优点,但也有控制输出抖振的问题。为有效克服离散滑模变结构控制的抖振问题,采用自适应趋近律来改善滑模变结构控制,实现对燃料电池电站功率调节系统逆变器输出波形的控制。同时,为抑制系统外部干扰和测量噪声,在控制系统中加入了滤波环节。仿真实验结果表明,采用自适应趋近律改善的滑模变结构控制器有良好的抗干扰能力,能较好地抑制抖振。

To obtain the output waveform adapting to fuel cell power plant, an adaptive sliding mode control based output waveform control strategy for fuel cell power plant is researched. Sliding mode variable structure control possesses such advantages as high response speed, anti-interference etc.. however there is the trouble of chattering in output waveform to be controlled in this control approach. In order to effectively overcome the chattering occurred in discrete sliding mode variable structure control, adaptive reaching law is applied in the improvement of sliding mode variable structure control to implement the control of inverter output waveform of power conditioning system for fuel cell power plant. Meanwhile. to suppress external interference and measurement noise, a filter is added into control system. Simulation results show that the sliding mode variable structure controller that is improved by adaptive reaching law possesses good anti-interference ability and can suppress chattering better.