混合储能的鲁棒控制方法

针对传统混合储能变换器设计都基于精确模型,没有考虑其中的不确定量(如超级电容端电压和负载),提出了一种鲁棒H∞控制器。根据建立的状态空间模型和选取的不确定量,利用凸优化理论设计超级电容(super capacitor,SC)和锂电池(lithium battery,LB)的多胞体模型。当不确定量变化引起稳态工作点移动,导致母线电压波动时,通过一阶低通滤波器完成功率分配。超级电容处理高频波动,锂电池处理低频波动,通过与H∞控制器相结合来极小化对母线电压造成的冲击影响,同时采用区域极点配置的方法改善动态响应。利用线性矩阵不等式(linear matrix inequality,LM I)求出超级电容和锂电池对应的H∞控制状态反馈控制参数。最后,通过M ATLAB实验证明了所提方法的有效性。

Robust Control Method of Hybrid Energy Storage

In the view of the traditional hybrid energy storage convertor design basing on accurate model without considering the uncertainties (such as super capacitor terminal voltage and load), this paper proposes a robust H-infinity controller.Based on the established state space model and the selected uncertainties, we use convex optimization theory to design a multi cell model of super capacitor (SC) and lithium battery (LB).The power allocation is achieved by the first order low-pass filter (LPF) when the change of the uncertainty leads to the moving of the steady working point, which leads to the fluctuation of the bus voltage.SC deals with the high frequency fluctuation and LB deals with low frequency fluctuations.We minimize the impact of uncertainties` changes on the bus voltage by combining with the designed H-infinity controller, and adopt regional pole assignment method to improve the dynamic response.Then, we use the linear matrix inequality (LMI) to obtain the H-infinity control state feedback control parameters of SC and LB.Finally, the effectiveness of the proposed method has been proved by MATLAB experiment.