一种基于简化ADRC的混合储能系统改进低通滤波策略

An improved low pass filter strategy for hybrid energy storage system of based on simplified ADRC

针对传统基于PI控制器的混合储能系统(hybrid energy storage system,HESS)低通滤波功率分配法造成的直流母线电压抗扰力差的问题,提出了一种基于简化自抗扰控制器(active disturbance rejection control,ADRC)的改进低通滤波策略。首先,HESS中能量密度大的锂电池响应低频分量,同时利用其电流误差分量来控制功率密度大的超级电容器,使其响应高频分量的同时也补充锂电池未能立刻响应部分,减小锂电池充放电电流应力。然后,选择调参较为容易的简化ADRC代替PI控制器,提高控制器的鲁棒性。最后,搭建模型,在光伏系统输出波动和负荷投切环境下,对传统控制方法和改进后的策略进行仿真对比。结果表明:改进后的策略在合理响应高低频功率的同时,母线电压超调量减小52%,响应时间缩短67%,提高了直流母线电压的抗扰能力。

Aiming at the problems of poor DC bus voltage immunity caused by low pass filter power distribution method based on traditional PI controller for hybrid energy storage system(HESS),an improved low pass filter strategy based on simplified ADRC is proposed.First,in HESS,the lithium battery with high energy density responds to low-frequency components,and at the same time its current error component is used to control the super-capacitor with high power density,so that it responds to high-frequency components while supplents the part of the lithium battery that failed to respond immediately,and reducing lithium battery charge and discharge current stress.Then,the simplified ADRC is chosen to replace the PI controller to improve the robustness of the controller.Finally,a model is bulit to compare the traditional control methods and improvement strategies under the photovoltaic system output fluctuation and load switching environment.The results show that the improved strategy responds to high and low frequency power reasonably,the bus voltage overshoot is reduced by 52%,the response time is shortened by 67%,and the DC bus voltage immunity is improved.