超级电容储能系统鲁棒分数阶PID控制设计

针对超级电容储能系统(supercapacitor energy storage system, SCES)设计了一款鲁棒分数阶PID (robust fractional-order PID control, RFOPID)控制。首先,利用高增益扰动观测器(high-gain perturbation observer, HGPO)对SCES的非线性、未建模动态和参数不确定性所聚合的扰动进行实时快速估计。接着,该扰动由分数阶PID (fractional-order PID, FOPID)控制器进行完全补偿。所提控制器不依赖于精确的SCES模型,仅需测量dq轴电流,易于硬件实现。最后,通过3种算例对RFOPID控制的控制性能进行评估。仿真结果表明:与其他控制器相比,RFOPID控制在各种工况下均具有最佳的控制性能和最强的鲁棒性。

Design of Robust Fractional-Order PID Control of Supercapacitor Energy Storage Systems

This study designs a robust fractional-order PID control(RFOPID) strategy of supercapacitor energy storage systems(SCES). At first, the nonlinearities, unmodelled dynamics and parameter uncertainties of SCES are estimated effectively by a high-gain perturbation observer(HGPO). Furthermore, a fractional-order PID(FOPID) controller is utilized to completely compensated the perturbation estimation. No accurate SCES model is required while only the dq-axis currents need to be measured, which is easy to implement in hardware. Finally, three case studies are used to evaluate the performance of RFOPID control. Simulation results show that RFOPID has the best control performance and the strongest robustness under various operation conditions compared with other controller.