基于内部故障仿真的可变速抽水蓄能发电电动机定子侧主保护优化配置研究  

Optimal configuration of main protection for a variable speed pumped storage power generator based on internal fault simulation

作　　者：尹项根[1] 乔健[1] 王义凯 谭力铭 卢庆辉 李伟 YIN Xianggen;QIAO Jian;WANG Yikai;TAN Liming;LU Qinghui;LI Wei(State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science andTechnology,Wuhan 430074,China;Pumped-Storage Technological&Economic Research Institute,State Grid Xinyuan Company Ltd.,Beijing 100053,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),湖北武汉430074 [2]国网新源控股有限公司抽水蓄能技术经济研究院,北京100053

出　　处：《电力系统保护与控制》2022年第13期1-10,共10页Power System Protection and Control

基　　金：国家自然科学基金项目资助(51877089)。

摘　　要：大型可变速抽水蓄能机组具有交流励磁和变速恒频发电的特点,研究其内部故障仿真建模方法对明确其主保护最优配置方案有实用意义。首先,基于分支电压方程和磁链方程建立可变速抽水蓄能发电电动机的通用数学计算模型,能够实现对并网满载工况下定子绕组内部短路故障和开焊断线故障的暂态仿真。仿真结果中两类故障的故障特征与理论分析一致,验证了该数学计算模型的正确性。然后,根据定子绕组的绕线规律分析可能发生的短路故障和断线故障情况,利用所建立的数学模型对所有故障情况进行仿真计算。最后,经定量化分析比较,发现主保护配置方案为:“零序横差电流保护+裂相横差电流保护+完全纵差电流保护”时保护覆盖范围最大。The large-scale variable-speed pumped storage unit has the characteristics of alternating current excitation and variable-speed constant-frequency power generation.It is of practical significance to study the internal fault simulation to clarify the optimal configuration scheme of its main protection.First,a general mathematical calculation model of a variable-speed pumped storage power generation motor is established based on the branch voltage equation and flux linkage equation.This can realize the transient simulation of the internal short-circuit fault and the open-welding line fault of the stator winding under grid-connected full load condition.The fault characteristics of the two types of faults in the simulation results are consistent with the theoretical analysis,and this verifies the correctness of the mathematical calculation model.Then,all possible short-circuit faults and disconnection faults are analyzed according to the winding law of the stator winding,and the established mathematical model is used to simulate and calculate all faults.Finally,it is found that the protection coverage is the best when the main protection configuration scheme is‘zero sequence transverse and split phase transverse and complete longitudinal differential current protection’through quantitative analysis and comparison.

关 键 词：可变速抽水蓄能机组 内部短路故障 开焊断线故障 主保护优化 

分 类 号：TV743[水利工程—水利水电工程]