基于信号时滞补偿的HVDC和同步发电机的广域协调控制  

The Wide Area Coordinating Control of HVDC and Synchronous Generators With Signal Transmission Delay Compensation

作　　者：覃波[1] 李兴源[1] 胡楠[1] 马静[1] 

机构地区：[1]四川大学电气信息学院,四川成都610065

出　　处：《现代电力》2014年第3期22-28,共7页Modern Electric Power

基　　金：国家高技术研究发展计划(863计划)(2011AA05A119);国家电网公司和浙江电力公司重大专项资助(SGCC-MPLG001(003-027)-2012)

摘　　要：针对发电机励磁和HVDC附加控制相互作用而可能引起系统阻尼性能变差的问题,通过对包含n台发电机以及1条直流线路的系统模型进行推导,得到了发电机励磁系统和HVDC附加控制的广域协调控制规律。该控制器利用广域信号补偿HVDC和发电机参数之间的耦合作用,但远端测量系统和广域控制信号所引入的延迟会影响控制器的性能。本文重点分析了时间延迟对系统振荡阻尼的影响,并引入统一Smith预估器方法以保持在较大时间延迟时电力系统的性能。交直流四机系统的仿真阐明了延迟对模态阻尼的影响以及延迟补偿的意义。仿真还表明统一Smith预估器的引入使得发电机转速和交流线路的传输功率在较大时间延迟下仍能够有较好的阻尼,并具有一定的鲁棒性。The interactions of the generator excitation and HVDC additional control may affect the system damping performance. The model which contains n generators and 1 DC line is derived and the wide area coordination control law of generator excitation system and HVDC additional control is also obtained. The widearea coordinating control ler （WACC） applies remote signals to compensate the inter actions between HVDC and generator variables. However, the time delays introduced by remote measurement and re mote control signals will affect the performance of the WACC. In this paper, the impact of time delay on system oscillation damping is analyzed, and the unified smith pre diction approach is used to preserve power system performance with large time delays. The simulation on AC/DC four machine tworegional power system is used to illustrate the influence of time delay on mode damping and the signifi cance of delay compensation. The simulation results show that the introduce of unified smith predictor has better damping effect when generator speeds and the transmission power of AC transmission line have bigger time delay, and has certain robustness.

关 键 词：协调 广域信号 统一Smith预估器 时间延迟 广域控制 

分 类 号：TM744[电气工程—电力系统及自动化]