宁夏多直流外送系统SSO特性分析及次同步阻尼控制器设计  

Sub-Synchronous Oscillation Characteristics Analysis and SSDC Design of Ningxia Multiple DC Transmissions System

作　　者：江桂芬[1] 孙海顺[1] 陈霞[1] 朱鑫要 高峰[3] Jiang Guifen;Sun Haishun;Chen Xia;Zhu Xinyao;Gao Feng(State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan,430074,China;State Grid Jiangsu Electric Power Research Institute,Nanjing,211103,China;State Grid Ningxia Electric Power Research Institute,Yinchuan,750000,China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),武汉430074 [2]国网江苏省电力公司电力科学研究院,南京211103 [3]国网宁夏电力公司电力科学研究院,银川75000

出　　处：《电工技术学报》2017年第A01期30-38,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51607092)

摘　　要：针对宁夏电网近电气距离耦合的火电机群与多直流输电的简化等值送端系统,利用基于复频域端口等效导纳矩阵的复转矩系数法对其进行次同步振荡(SSO)特性分析。研究表明,降低宁夏电网直流输电外送功率,加强宁夏电网送端交流系统,增强直流换流站之间电气耦合强度等均有利于改善系统SSO阻尼特性。其次,针对存在SSO风险的灵武二期电厂机组,开展直流输电附加次同步阻尼控制器设计,并通过仿真证明了其有效性。该文研究成果可为宁夏电力外送系统的运行、规划及SSO抑制提供技术支撑和参考。For a simplified equivalent sending system with multiple thermal power units andmultiple DC transmissions in Ningxia power grid,the complex torque coefficient method is employedbased on the complex frequency domain port-equivalence conductance matrix(CPCM)to analyze thedamping characteristics of generation units.It is observed that reducing the DC power level orimproving the ac system strength of the sending end and strengthening the electrical coupling betweendc systems contribute to damping improvement of the system subsynchronous oscillation(SSO).Inaddition,a subsynchronous damping controller(SSDC)designed is intended to reduce the SSO risk ofthe turbine-generators in Ningxia power grid.Simulations are conducted to verify the effectiveness ofthe controller.The research is expected to provide the technical support and guidance for the operation,planning and SSO mitigation of Ningxia power grid.

关 键 词：高压直流输电系统 次同步振荡 复转矩系数法 次同步阻尼控制器 

分 类 号：TM712[电气工程—电力系统及自动化]