针对直流电网故障的限流与限能技术研究  

Research on Current Limiting and Energy Limiting Technology for DC Power Grid Fault

作　　者：潘垣[1] 陈立学[1] 袁召[1] 徐敏 刘黎明[1] 李归霞 PAN Yuan;CHEN Lixue;YUAN Zhao;XU Min;LIU Liming;LI Guixia(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(School of Electrical and Electronic Engineering,Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),湖北省武汉市430074

出　　处：《中国电机工程学报》2020年第6期2006-2015,共10页Proceedings of the CSEE

基　　金：国家自然科学基金项目(U1766211);国家电网公司科技项目(52010119000H)。

摘　　要：随着柔性直流输电迅速发展,大电网互联程度增加,电压等级不断的提高,在输电系统发生故障时故障电流不断提高,导致断路器的开断压力增大,而且过大的故障电流增大了线路储能元件的初始储能,使得直流断路器在开断故障电流后避雷器吸能持续上升,增大了避雷器的制造难度。针对上述问题,该文首先对避雷器吸能进行理论分析,得出主回路的平波电感大小以及线路电流大小是影响避雷器吸能的主要因素,提出降低等效电感优化吸能拓扑、平波电抗器串电阻优化吸能拓扑和限流型优化吸能拓扑,并基于PSCAD仿真软件验证拓扑结构在限制短路电流和限制避雷器吸能的有效性。With the rapid development of flexible DC transmission,the interconnection degree of large power grid increases,and the voltage level continues to improve.When the transmission system fails,the fault current continues to increase,resulting in the increase of the breaking pressure of the circuit breaker,and the excessive fault current increases the initial energy storage of the line energy storage elements,which makes the energy absorption of the arrester continue to rise and increase after the breaking fault current of the DC circuit breaker,it is difficult to manufacture the arrester.In view of the above problems,firstly,the theoretical analysis of the energy absorption of the arrester was carried out in this paper,and it was concluded that the main factors affecting the energy absorption of the arrester are the size of the flat wave inductance and the line current in the main circuit.The optimal energy absorption topology of reducing the equivalent inductance,the optimal energy absorption topology of the series resistance of the flat wave reactor and the optimal energy absorption topology of the current limiting type were put forward,and the topological junction was verified based on the PSCAD simulation software which is constructed to limit the effectiveness of short-circuit current and arrester energy absorption.

关 键 词：高压直流断路器 能量流动 避雷器吸能 高压直流限流器拓扑 

分 类 号：TM89[电气工程—高电压与绝缘技术]