藏中联网工程系统调试风险防控策略  

Risk Prevention and Control Strategy for System Test of Central Tibet AC Interconnection Project

作　　者：史华勃 张华 孙文成 陈刚 汤凡 周波 魏巍 丁理杰 常晓青 SHI Huabo;ZHANG Hua;SUN Wencheng;CHEN Gang;TANG Fan;ZHOU Bo;WEI Wei;DING Lijie;CHANG Xiaoqing(State Grid Sichuan Electric Power Research Institute,Chengdu 610041,Sichuan Province,China;Southwest Branch of State Grid,Chengdu 610041,Sichuan Province,China)

机构地区：[1]国网四川省电力公司电力科学研究院,四川省成都市610041 [2]国家电网公司西南分部,四川省成都市610041

出　　处：《电网技术》2020年第6期2214-2221,共8页Power System Technology

基　　金：国家电网有限公司科技项目(521999180002)。

摘　　要：藏中联网工程输电距离长,末端西藏电网容量小、负荷轻、稳定裕度低且频率稳定与有功功率、无功功率高度耦合;高压直流输电系统、光伏发电系统等电力电子设备众多,大型主变空载合闸将引发系列安全问题,此外静止无功补偿器(static var compensator,SVC)控制参数整定不当易产生电磁振荡。该文提出了通过优化充电启动顺序的无功电压控制方法;加装合闸电阻、选相合闸装置并配合运行方式调整的励磁涌流和过电压综合防控策略;兼顾电磁振荡抑制和无功调节性能的SVC控制参数优化方法。制定了考虑光伏发电、直流输电系统运行风险及电网频率稳定风险的调控运行策略。仿真分析和系统调试结果验证了所提措施的有效性。The central Tibet AC interconnection project(CTAIP)connects the Tibet power grid and Sichuan power grid through a long distance transmission line more than 1500 km.The Tibet power grid,which is located at the end of networking channel,has small capacity,light load and low stability margin.Meanwhile,the frequency stability is highly coupled with both active power and reactive power.Furthermore,there are a large number of power electronic equipment in the high voltage direct current transmission(HVDC)and photovoltaic system(PV).Therefore,energizing no-load transformers will cause a series of safety problems.In addition,it is easy to excite the electromagnetic oscillation when the control parameters of static var compensator(SVC)are not properly tuned.In order to reduce the overvoltage risk in the test process,a reactive voltage control is proposed through optimizing charging sequence is proposed.An integrated control strategy for inrush current and over-voltage suppression is put forward,which involves adding closing resistance,phase selection closing device,and adjusting power grid operation mode.And an optimization method of SVC control parameters considering both electromagnetic oscillation suppression and reactive power regulation performance is presented to solve the electromagnetic oscillation caused by SVC.Finally,the regulation and operation strategy considering the operation risk of PV and HVDC transmission system and the frequency stability risk of power grid is formulated.The simulation analysis and system test results verify the effectiveness of the proposed measures.

关 键 词：藏中联网工程 系统调试 励磁涌流 电磁振荡 风险防控策略 

分 类 号：TM721[电气工程—电力系统及自动化]