常规直流阀区故障与测量隐患定位方法  

Location Method of Fault and Hidden Measurement Defect for LCC-HVDC Valve Area

作　　者：陈德扬 罗炜[4] 郭琦 李书勇[1,2,3] CHEN Deyang;LUO Wei;GUO Qi;LI Shuyong(State Key Laboratory of HVDC(Electric Power Research Institute of China Southern Power Grid Company Limited),Guangzhou 510663,China;Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System,Guangzhou 510663,China;CSG Key Laboratory for Power System Simulation,Guangzhou 510663,China;China Southern Power Grid Company Limited,Guangzhou 510663,China)

机构地区：[1]直流输电技术国家重点实验室(南方电网科学研究院有限责任公司),广东省广州市510663 [2]广东省新能源电力系统智能运行与控制企业重点实验室,广东省广州市510663 [3]中国南方电网公司电网仿真重点实验室,广东省广州市510663 [4]中国南方电网有限责任公司,广东省广州市510663

出　　处：《电力系统自动化》2021年第12期167-173,共7页Automation of Electric Power Systems

基　　金：中国南方电网有限责任公司科技项目(ZBKJXM20180145)。

摘　　要：针对常规电网换相换流器型高压直流阀区故障及直流系统测量隐患,文中提出了相应的定位方法。首先,根据晶闸管单向导通特性构造线性整流函数,再根据基尔霍夫电流定律构造对应阀区不同区域的差动电流,并进一步利用换流阀导通时序和现有保护减少误判,缩小划定的阀区故障范围。为查找直流系统测量隐患,构造量测方程并利用状态估计算法对测量值进行估计,并给出工程优化方法。实际故障案例和硬件在环试验结果表明,所提算法能够较为准确地定位阀区故障以及直流系统测量隐患。Aiming at valve faults of conventional line-commutated converter based high-voltage direct current(LCC-HVDC)and hidden measurement defects of DC systems,this paper proposes the corresponding location methods.First,the linear rectification function is constructed according to the unidirectional conduction characteristic of the thyristor,and then the differential current corresponding to the different regions of valve area is constructed according to Kirchhoff current law.Furthermore,the conduction sequence of the converter valves and the existing protection are used to reduce misjudgment and narrow the fault range of the valve area.In order to find out the hidden measurement defect of DC systems,the measurement equation is constructed and the state estimation algorithm is used to estimate the measured values,and then the engineering optimization method is given.The actual fault cases and hardware-in-loop test results show that the proposed algorithm can accurately locate the fault in valve group and the hidden measurement defect of DC systems.

关 键 词：阀区故障 测量隐患 故障定位 状态估计 高压直流 

分 类 号：TM721.1[电气工程—电力系统及自动化]