基于最优比例积分的电力弹簧控制器设计

电力弹簧((Electric Spring,ES)能有效缓解分布式发电系统中出现的间歇性和不稳定性问题,但是在现有控制方式下易引入谐波,且响应时间较长,严重影响了电力弹簧的调节效果。针对PI和PR控制器应用于ES这个非线性复杂系统上稳定性和鲁棒性较差的特点,应用改进的单纯型加速算法(simplex method,SPX),以时间乘以误差平方积分准则作为寻优目标函数,对PI控制器的参数进行实时调整、寻优,使ES的动态响应效果达到最佳。仿真结果表明最优PI控制器能快速、无超调的跟踪ES系统的电压设定值,具有较强的适应性和稳定性。

Design of an Electric Spring Controller Based on Optimal PI

Electric spring (ES) can effectively relieve intermittency and instability occurring in distributed power generation systems.However,harmonics can easily be induced in the current control method with a long response time,thus seriously affecting adjustment effect of electric springs.In this paper,an improved simple type accelerating algorithm is used to overcome relatively low stability and robustness of PI and PR controllers applied in nonlinear complex system ES.In this method,integral time square error is taken as optimal goal function to adjust and optimize PI controller parameters on a real-time basis,so that ES dynamic response effect may be optimized.Simulation results show that the optimal PI controller can quickly track set voltage value of the ES system with no overshooting,and has quite good adaptability and stability.