基于改进射影控制的柔性直流输电广域阻尼控制  

VSC-HVDC wide-area damping controller design based on improved projective control

作　　者：郭磊[1] 张英敏[1] 李兴源[1] 

机构地区：[1]四川大学电气信息学院,成都610065

出　　处：《电测与仪表》2015年第22期1-7,共7页Electrical Measurement & Instrumentation

基　　金：国家重点基础研究发展计划(973计划)(2013CB228204);国家电网公司大电网重大专项资助项目课题(SGCC-MPLG001-027-2012)

摘　　要：针对包含柔性直流输电的交直流互联系统之间存在低频振荡,且一般的直流附加阻尼控制器阶数较高,影响了控制的实用性和有效性,文中提出将基于射影定理的降阶控制器设计方法应用于VSC-HVDC输电系统的阻尼控制器设计当中。首先通过TLS-ESPRIT算法辨识出系统的振荡特性和传递函数;再根据极点配置方法和Ackermann公式得到系统的状态反馈增益矩阵;最后通过改进射影控制定理,保留参考全状态闭环系统的主导特征值,输出低阶射影控制器。在PSCAD/EMTDC中的一个包含柔性直流输电的四机两区域模型中,对不同励磁增益参数下无附加控制器和有时滞射影控制器下的系统进行仿真分析。结果表明,所设计的射影控制器具有较好的阻尼特性和鲁棒性。In allusion to the low frequency oscillation existed in the AC/DC power system with VSC-HVDC system, and the general HVDC additional damping controllers have higher order of matrix which affects the practicality and a- vailability, a kind of reduced-order controller design method based on projective control theorem is proposed to be used in the design of damping controller in VSC-HVDC transmission system. Firstly, the oscillation character and transfer function are identified by the TLS-ESPRIT algorithm. Then, the state-feedback matrix is gotten based on pole- placement method and Ackermann formula. Finally, taking advantage of the projective control theorem and retaining dominant eigenvalue to get the low-order projective controller. Simulations and analyses are done in the system in the control of different excitation parameters when it has no additional controller and projective controller with time delay. The results validate that the designed projective controller has good damping character and robustness.

关 键 词：VSC-HVDC TLS-ESPRIT 极点配置 射影控制 阻尼控制器 

分 类 号：TM933[电气工程—电力电子与电力传动]