考虑多直流协调恢复的换相失败预测控制启动值优化方法  

Optimization Method for Startup Threshold of Commutation Failure Prediction Control Considering Coordinated Recovery of Multi-infeed HVDC Systems

作　　者：王玉 侯玉强 刘福锁 曹路 李威 薛峰 黄志龙 WANG Yu;HOU Yuqiang;LIU Fusuo;CAO Lu;LI Wei;XUE Feng;HUANG Zhilong(NARI Group Corporation（State Grid Electric Power Research Institute）,Nanjing 211106,China;East China Branch of State Grid Corporation,Shanghai 200120,China)

机构地区：[1]南瑞集团(国网电力科学研究院)有限公司,江苏省南京市211106 [2]国家电网公司华东分部,上海市200120

出　　处：《电力系统自动化》2018年第22期85-90,158,共7页Automation of Electric Power Systems

基　　金：国家电网公司科技项目"利用调相机和直流控保系统抑制直流换相失败对系统影响的应用技术研究"~~

摘　　要：换相失败预测控制环节在降低换相失败概率和连续换相失败风险的同时,往往需要交流系统提供更强的无功支撑,进而对直流自身及其他直流的换相失败特性和恢复特性产生影响。首先分析了直流恢复能力及其恢复过程中多馈入直流的无功支撑耦合影响,综合考虑直流近区动态无功补偿设备的支撑能力,提出一种考虑多馈入直流交互作用的直流换相失败预测环节启动门槛值优化方法,以实现多回直流的协调恢复,降低直流发生连续换相失败风险和直流换相失败对电网的功率冲击。基于实际多馈入直流电网的仿真算例验证了所提方法的有效性。Commutation failure prediction control （CFPREV） is equipped to reduce the probability of commutation failure and the risk of continuous commutation failure. When it acts, however more reactive power is required from AC system, which will affect the commutation failure characteristics and the recovery process of the AC and DC interconnected system. The reactive support coupling influence of multi-infeed DC in the restorability and restore process of the HVDC system is analyzed, and then an optimization method of CFPREV startup threshold is proposed considering the influence of the support ability of dynamic reactive power compensation devices, to achieve coordinated recovery of the whole system and reduce the risk of eontinuous commutation failure and its power impact on AC system. The effectiveness of the proposed method is verified based on the actual multi-infeed DC power grid simulation.

关 键 词：多馈入直流系统 连续换相失败 协调恢复 换相失败预测控制 

分 类 号：TM721.1[电气工程—电力系统及自动化]