风电场双回送出线路时域故障测距新方法  

Novel Method of Time-domain Fault Location for Wind Farm Double-circuit Transmission Lines

作　　者：束洪春[1,2] 邓亚琪 曹璞璘[2] 朱梦梦 马御棠 安娜[2] SHU Hongchun;DENG Yaqi;CAO Pulin;ZHU Mengmeng;MA Yutang;AN Na(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan Province,China;Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan Province,China;Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650217,Yunnan Province,China)

机构地区：[1]昆明理工大学机电工程学院,云南省昆明市650500 [2]昆明理工大学电力工程学院,云南省昆明市650500 [3]云南电网有限责任公司电力科学研究院,云南省昆明市650217

出　　处：《电网技术》2023年第4期1450-1459,共10页Power System Technology

基　　金：国家自然科学基金项目(52037003,52167012);云南省重大科技专项计划项目(202002AF080001);云南省基础研究项目(202001AT070096)。

摘　　要：由于故障时新能源电源输出的短路电流呈现出频率偏移、谐波含量占比高、幅值受限、正负序阻抗不相等等特征,从而导致基于工频相量的故障定位方法存在失效的风险。为此,提出适用于风电场双回送出线路故障测距方法。采用时域有限差分法离散以偏微分方程形式表示的传输线方程,再利用改进变分迭代法求解传输线方程,得到线长的函数,并将线路两端的相电压、相电流作为边界条件;最后,构造故障测距函数以实现故障定位。通过PSCAD/EMTDC和硬件在环测试实验平台进行分析,验证了所提算法能准确地定位故障位置。As the short-circuit current output from the new energy power supply at the time of a fault presents the characteristics of frequency shifting,high percentage of the harmonic content,restricted amplitudes,unequal positive and negative sequence impedances,etc.,resulting in the risks of the fault location failures based on the power frequency.Therefore,a fault location method for double-circuit transmission lines of a wind farm is proposed.The transmission line equation is discretized which is expressed in the form of partial differential equations by using the finite-difference time-domain.Then,the transmission line equation is solved by using the modified variational iterative method to obtain the function of line length,using the phase voltage and the phase current at the both ends of the line as the boundary conditions.Last,the fault location is achieved by constructing the fault location function.Through the analysis on the PSCAD/EMTDC and the hardware-in-the-loop test experimental platform,the proposed algorithm is verified to be able to accurately notarize the fault locations.

关 键 词：故障测距 同塔双回线 改进变分迭代法 风电场 

分 类 号：TM721[电气工程—电力系统及自动化]