基于单端暂态电压的含限流电抗器直流配电网保护方法  

Protection Method Based on Single-terminal Transient Voltage for DC Distribution Network with Current Limiting Reactor

作　　者：陈少宇 黄文焘[1] 邰能灵[1] 卫卫 陈晔 CHEN Shaoyu;HUANG Wentao;TAI Nengling;WEI Wei;CHEN Ye(Key Laboratory of Control of Power Transmission and Conversion,Ministry of Education(Shanghai Jiao Tong University),Shanghai 200240,China;No.708 Research Institute of China State Shipbuilding Corporation Limited,Shanghai 200011,China)

机构地区：[1]电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市200240 [2]中国船舶工业集团有限公司第七〇八研究所,上海市200011

出　　处：《电力系统自动化》2021年第8期185-193,共9页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2019YFE0102900);国家自然科学基金青年基金资助项目(51807117);上海市教委科研创新重大项目(2019-01-07-00-02-E00044)。

摘　　要：直流配电网故障特性复杂,故障的可靠识别和快速切除是保护面临的主要难点之一。针对含限流电抗器的多端柔性直流配电网,文中利用限流电抗器的故障暂态电压特性,提出一种单端暂态电压的直流线路保护方法。根据限流电抗器故障暂态初始电压的差异识别区内外故障,利用正、负极限流电抗器故障电压构成的电压比值系数区分故障类型,并据此提出故障识别判据和故障选极判据。在Simulink中建立多端柔性直流配电网仿真模型,结果表明所提保护方法可在0.5 ms内快速判别故障位置和故障类型,仅利用单端数据即可实现全线速动,具有良好的区内外故障识别区分能力,且无须考虑通信和双端数据同步问题,具有良好的抗过渡电阻和抗噪声干扰能力。The fault characteristics of DC distribution networks are of great complexity.Reliable identification and fast isolation of faults are the main difficulties faced by protection.Aiming at the multi-terminal flexible DC distribution network with current limiting reactors,based on the fault transient voltage characteristics of current limiting reactors,a single terminal transient voltage protection method for DC lines is proposed.According to the difference of transient initial voltage of current limiting reactors,the internal and external faults can be identified.The fault types can be distinguished by the voltage ratio coefficient composed of fault voltage of positive and negative limiting current reactors.According to these characteristics,the fault identification criterion and fault pole selection criterion are proposed.The simulation model of the multi-terminal flexible DC distribution network is established in Simulink platform.The results show that the proposed protection method can quickly identify the fault location and fault type within 0.5 ms and can realize the full-line fast operation only by using single-terminal data.Also,the protection method has a good distinction ability between internal and external faults,does not need to consider communication and double-ended data synchronization,and has good anti-transition resistance and anti-noise interference capabilities.

关 键 词：多端柔性直流配电网 单端暂态电压保护 限流电抗器 故障暂态初始电压 故障判别 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM471TM773