基于鲁棒残差观测器的分布式电网动态补偿控制  

Dynamic Compensation Control of Distributed Power Network Based on Robust Residual Observer

作　　者：胡长斌[1] 陆珩 罗珊娜 史运涛[1] 马瑞 温春雪[1] 周京华[1] 朴政国[1] HU Changbin;LU Heng;LUO Shanna;SHI Yuntao;MA Rui;WEN Chunxue;ZHOU Jinghua;PIAO Zhengguo(College of Electrical and Control Engineering,North China University of Technology,Shijingshan District,Beijing 100144,China;State Grid Hebei Electric Power Research Institute,Shijiazhuang 050011,Hebei Province,China)

机构地区：[1]北方工业大学电气与控制工程学院,北京市石景山区100144 [2]国网河北省电力有限公司电力科学研究院,河北省石家庄市050011

出　　处：《电网技术》2020年第5期1834-1844,共11页Power System Technology

基　　金：国家重点研发计划项目-社区风险监测与防范关键技术研究(2018YFC0809700);北京市高水平创新团队建设计划(IDHT20180502);北方工业大学科技创新工程计划(18XN141)。

摘　　要：为了增强分布式电网对电压波动、谐波和三相不平衡的抗干扰能力,针对电压型逆变器设计了一种基于鲁棒残差观测器的分布式电网动态补偿控制策略。首先以dq轴坐标系为基准,建立电流基波和非基波分离的逆变器状态空间模型,依据所设计的动态补偿控制结构将电能质量问题分解定义为逆变器dq坐标系下状态空间模型的扰动输入。其次根据鲁棒尤拉参数化稳定控制器理论推导出基于鲁棒残差观测器的动态补偿控制结构,并对其正确性加以证明。然后参考鲁棒模型匹配原理使用线性矩阵不等式(linearmatrix inequality,LMI)对电压动态补偿控制器进行求解,同时完成电流环控制器的二次动态补偿,并通过小信号稳定性分析证明系统的稳定性。最后将鲁棒残差观测器动态补偿结构加入到逆变器双闭环控制中,改善分布式电网电压的电能质量问题,并在AppSIM半实物仿真系统平台上验证其有效性,其结果证明该策略可以在不改变原控制系统结构和参数基础上,提升抗干扰能力和鲁棒控制效果。In order to enhance the stability of microgrid when voltage fluctuation, voltage harmonic and three-phase unbalance occurred, a dynamic compensation control strategy based on the robust residual generator is designed for the voltage source inverter. Firstly, based on the dq axis coordinate, the state space model of the inverter with current fundamental and non-fundamental separation is established. According to the designed dynamic compensation control structure, the power quality problem is defined as the disturbance input of the state space model. Secondly, based on the Youla parameterization stability control theory, a fault-tolerant control framework based on the robust residual generator is deduced and its correctness is proved. Thirdly, based on the model matching principle, the linear matrix inequality(LMI) is used to solve the voltage dynamic compensation controller, and the secondary dynamic compensation of the current loop controller is completed. At the same time, the stability of the system is proved via small signal stability analysis. Finally, the residual observer dynamic compensation structure is added to the double closed-loop control of the inverter to improve the power quality of the distributed grid voltage. Its effectiveness is verified on the hardware-in-the-loop simulation system. The results show that the strategy can improve the anti-interference ability and robust control effect without changing the original structure and parameters.

关 键 词：分布式电网 电能质量 模型匹配 尤拉参数化 鲁棒残差观测器 

分 类 号：TM721[电气工程—电力系统及自动化]