差分进化改进微电网负荷频率混合H2/H∞鲁棒控制  

Differential evolution algorithm improving for micro-grid load frequency mixed H2/H∞ robust control

作　　者：李洪跃[1] 王锡淮[1] 肖健梅[1] LI Hong-yue;WANG Xi-huai;XIAO Jian-mei(Logistics Engineering College,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]上海海事大学物流工程学院

出　　处：《电机与控制学报》2019年第11期118-126,共9页Electric Machines and Control

基　　金：国家自然科学基金(61573240)

摘　　要：针对外部扰动及系统参数摄动引起微电网负荷频率波动问题,设计了混合H2/H∞鲁棒控制器对系统负荷频率进行控制。建立了包含电池的柴油发电机组二次频率控制模型,引入低通滤波器,使电池对系统高频扰动信号具有较好的抑制能力。以误差平方的积分最小作为系统的目标函数,在综合H_2范数表征的系统性能和H∞范数表征的鲁棒性能下,设计具有多目标约束条件的混合H2/H∞鲁棒控制器。采用差分进化算法对控制器加权函数参数进行寻优,使控制器在满足约束条件下达到最优。仿真实验结果表明所提出方法在满足系统鲁棒性能的基础上,同时具备较好的控制输出,保证微电网频率在外部功率扰动和系统参数摄动情况下具有较好的动态性能。In order to suppress the frequency fluctuation caused by the power unbalance or parameters perturbation in the micro-grid system,which is composed of multi-sources,a mixed H 2/H∞robust controller with multi-objective constraint was researched.Firstly,the state space function was established of the secondary frequency control model,including the diesel generator and battery.In order to suppress the external disturbance,a low pass filter was designed to separate the high frequency signal to battery.Secondly,the minimized integral squared error is defined as the objective function,and a mixed H 2/H∞robust controller with multi-objective constraint was designed synthesize the H 2-norm,which is characterized by the system performance,and the H∞-norm was designed,which characterized the robust performance.Furthermore,in order to obtain the optimal controller,the differential evolution algorithm was used to optimize the weighting function coefficient.Finally,the simulation results show that the proposed method has better control output while satisfying the robust performance of the system.The reasonableness and correctness of the proposed method are verified.

关 键 词：负荷频率控制 多目标优化 混合H_2/H_∞鲁棒控制 鲁棒性能 差分进化 

分 类 号：TM761[电气工程—电力系统及自动化]