考虑电压不平衡下的同步发电机定子匝间短路故障诊断

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DOI：10.15938/j.emc.2025.08.002

中图分类号：TM341 文献标志码：A 文章编号：1007-449X（2025）08-0010-09

Fault diagnosis on stator inter-turn short circuit in synchronous generator considering voltage unbalance

LI Junqing1， YU Changliang1， HE Yuling²， HUANG Tao³， TENG Siyu1，YIN Naichuan1， LIU Qirun1

（1.School of Electric and Electronic Engineering，North China Electric Power University，Baoding O71003，China; 2.School of Energy Power and Mechanical Enginering，North China Electric Power University，Baoding O710o3，China; 3.Chengde Power Supply Company of State Grid Jibei Electric Power Co.，Ltd.，Chengde O670， China）

Abstract：To address the misjudgment issue in fault diagnosis of inter-turn short-circuit faults in synchronous generator stator windings caused by grid voltage unbalance，a fault diagnosis method based on the DC component of instantaneous circulating current power was proposed. Firstly，the air gap magnetic field of the synchronous generator was analyzed，the circulating current characteristics of the parallel branches were derived，and the characteristic frequency of the instantaneous circulating current power under fault conditions was obtained. Secondly， taking the QFSN -3OO -2 -2OB turbine generator as an example，a finite element simulation model of the synchronous generator was established to analyze the variation of the synchronous generator's instantaneous circulating current power under diffrent transition resistances，fault turn numbers，and grid voltage unbalance.Finally，the conclusions were experimentally validated. The results indicate that when a stator winding inter-turn short circuit fault occurs in a synchronous generator，a high instantaneous circulating currnt power willbe generated， which primarily consists of a DC component and even harmonics. The DC component of the instantaneous circulating current power shows high sensitivity for diagnosing minor inter-turn short circuit faults in the stator winding and exhibits good robustness against grid voltage unbalance.

Keywords： voltage unbalance; synchronous generator; instantaneous circulating current power； DC component；stator inter-turn short circuit；fault diagnosis

0引言

随着新型电力系统的快速发展，光伏发电、风力发电等新能源在电力系统中占比日益提高。（剩余12213字）