基于混合H_2/H_∞控制理论的交直流并联系统机网阻尼协调控制  

A coordinated damping control of generator and gird in AC/DC parallel power system based on mixed H_2/H_∞ control method

作　　者：张爽 曾雪洋 摆存曦 田蓓 李保宏[2] 刘天琪[2] 

机构地区：[1]国网宁夏电力有限公司电力科学研究院,银川750001 [2]四川大学电气信息学院,成都610065

出　　处：《电测与仪表》2018年第5期57-62,118,共7页Electrical Measurement & Instrumentation

基　　金：国家电网公司科技项目(SGNXDK00BGJS1600021)

摘　　要：针对交直流并联运行系统阻尼不足、存在区域间低频振荡的问题,文中提出一种基于混合H_2/H_∞控制理论的交直流并联系统的机网阻尼协调控制策略。首先采用最小二乘-旋转不变算法辨识出系统振荡模式和开环降阶模型,结合混合H_2/H_∞控制理论,在高压直流输电和发电机中设计了附加鲁棒阻尼控制器,该控制器采用线性矩阵不等式的求解方法和输出反馈构造,求解容易,控制器构造简单,具有较强的鲁棒性。最后在PSCAD/EMTDC中搭建四机两区域测试系统,并与传统附加阻尼控制器对比,仿真结果验证了机网阻尼协调控制的有效性、鲁棒性。In light of the low damping and low frequency oscillation problems in AC/DC parallel power system,a coordinated damping control strategy of generator and gird based on mixed H_2/H_∞control theory is proposed in this paper. Firstly,system oscillation model and open-loop reduced order model are identified by the total least squares-estimation of signal parameters via rotational invariance techniques( TLS-ESPRIT) algorithm. Combining H_2/H_∞control theory and adopting the solution method of linear matrix inequalities and the output feedback structure,the supplementary robust damping controllers of high voltage direct current( HVDC) and generator is designed,whose advantages are easy to be solved,with simple construct of controller,and strong robustness. In the end,a four-machine in two-domain test system is built in PSCAD/EMTDC,and compared with the traditional supplementary damping controller,the simulation results verify the effectiveness and robustness of the coordinated damping control of generator and gird.

关 键 词：交直流并联系统 低频振荡 鲁棒控制 附加阻尼控制 机网协调控制 

分 类 号：TM933[电气工程—电力电子与电力传动]