中性点直接接地系统单相串联铁磁谐振时域解析分析  

Time Domain Analytical Analysis of Single-phase Series Ferromagnetic Resonance in Neutral Point Solid Grounding Power System

作　　者：王宾[1] 张超 丁心志 WANG Bin;ZHANG Chao;DING Xinzhi(State Key Lab of Control and Simulation of Power Systems and Generation Equipments(Department of Electrical Engineering,Tsinghua University),Haidian District,Beijing 100084,China;School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,Shandong Province,China;Yunnan Electric Power Test and Research Institute(Group)Co.,Ltd.,Kunming 650217,Yunnan Province,China)

机构地区：[1]电力系统及发电设备安全控制和仿真国家重点试验室(清华大学电机系),北京市海淀区100084 [2]山东理工大学电气与电子工程学院,山东省淄博市255000 [3]云南电力试验研究院(集团)有限公司,云南省昆明市650217

出　　处：《中国电机工程学报》2022年第6期2124-2132,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(52077116);电力系统及大型发电设备安全控制和仿真国家重点实验室自主课题(SKLD21M09)。

摘　　要：中性点直接接地系统下进行倒闸操作时易引发铁磁谐振,现有研究尚无铁磁谐振完备的时域响应分析。针对该问题,建立中性点接地系统下串联铁磁谐振模型电路,提出考虑磁通–电流特性曲线变化率逐渐降低的非线性电感分段线性化等效方法,给出欠阻尼和过阻尼两种运行状态下的励磁电感磁通的全响应解析解,发现响应均是由系统激励激发的稳态分量和由动态元件初始储能决定的暂态分量叠加组成,仿真验证了全响应解析表达式的正确性,为后续铁磁谐振的检测及抑制研究奠定了基础。Ferromagnetic resonance is easily to be induced by switching operations in neutral directly grounded power system. There is no complete time domain response of ferromagnetic resonance in previous research. To solve this problem, a series ferromagnetic resonance model circuit under neutral grounding system was established, a piecewise linearization equivalent method of nonlinear inductance considering the gradual decrease of the change rate of flux current characteristic curve was proposed, and the full response analytical solutions of excitation inductance flux under underdamped and overdamped operating conditions were given. It is found that the response was composed of the superposition of the steady-state component excited by the system excitation and the transient component determined by the initial energy storage of the dynamic element. The simulation verified the correctness of the analytical expression of the full response, which laid a foundation for the subsequent research on the detection and suppression of ferromagnetic resonance.

关 键 词：铁磁谐振 非线性 分段线性等效 解析解 故障检测 

分 类 号：TM937[电气工程—电力电子与电力传动]