柔性直流与常规直流协调的紧急功率支援策略研究  

Emergency Power Support Control Strategy of VSC-HVDC and LCC-HVDC Coordination

作　　者：陈睿 孙仲卿 杨银国 刘福锁 李威 郜建良 吴晨曦 CHEN Rui;SUN Zhongqing;YANG Yinguo;LIU Fusuo;LI Wei;GAO Jianliang;WU Chenxi(Electric Power Dispatch and Control Center of Guangdong Power Grid Co., Ltd., Guangzhou 510600, China;Nari Technology Co., Ltd.,Nanjing 211106, China)

机构地区：[1]广东电网有限责任公司电力调度控制中心,广东广州510600 [2]国电南瑞科科技股份有限公司,江苏南京211106

出　　处：《电力工程技术》2017年第6期14-19,26,共7页Electric Power Engineering Technology

摘　　要：柔性直流(VSC-HVDC)具有响应速度快、有功无功解耦、可向交流系统提供无功支撑等运行特性。将柔性直流纳入电网紧急控制系统,可在提升交直流电网暂态稳定性基础上降低常规切机切负荷控制的代价。基于扩展等面积法则(EEAC),研究直流紧急功率支援提高故障后系统暂态安全稳定性的机理;通过对不同类型直流功率调制的对比研究,指出柔性直流与常规直流(LCC-HVDC)的紧急功率支援在改善故障后系统功角恢复方面存在差异,紧急控制应考虑不同类型直流的控制优先级;提出为保障故障后电网暂态稳定所需直流紧急支援功率计算方法,并结合不同故障情况下直流功率支援的优先级制定相应的紧急协调控制策略。The VSC-HVDC has the characteristics of fast responding,active and reactive power decoupling and AC bus voltage stabilizing.Emergency control system with VSC-HVDC control can enhance the level of transient stability of power grid while reduce the conventional control costs of generator tripping and load shedding.The mechanism of improving transient stability by emergency HVDC power support based on Extended Equal Area Criterion(EEAC)is proposed.Based on the comparison of different kinds of HVDC power modulation,the difference control effect on power angle recovery between VSC-HVDC andLCC-HVDCis shown.The priority of different kinds of HVDC in the emergency control should be taken into consideration.A method to calculate the amount of HVDC power support and the emergency coordination control strategy considering both the priority and the amount of HVDC power support in different fault conditions are proposed.

关 键 词：暂态稳定控制 柔性直流 常规直流 紧急功率支援 

分 类 号：TM712[电气工程—电力系统及自动化]