Connections Between Induction Generator Effect and Open-loop Modal Proximity to Cause Sub-synchronous Oscillations in Series-compensated Power System  

作　　者：Wenjuan Du Yang Wang H.F.Wang Tao Zhao Tim Littler 

机构地区：[1]College of Electrical Engineering,Sichuan University,Chengdu,China [2]School of Electrical Engineering,the Queen’s University of Belfast,Belfast,UK [3]IEEE

出　　处：《CSEE Journal of Power and Energy Systems》2024年第3期963-973,共11页中国电机工程学会电力与能源系统学报（英文）

基　　金：supported in part by the National Natural Science Foundation of China under Grant 52077144;by the Fundamental Research Funds for the Central Universities(YJ201654).

摘　　要：The induction generator effect(IGE)and the openloop modal proximity(OLMP)are two different reasons why subsynchronous oscillations(SSOs)in a series-compensated power system(SCPS)may occur.The IGE attributes the growing SSOs to negative resistance,while the OLMP explains the SSO mechanism from the standpoint of modal conditions.In this paper,we investigate the connections between the IGE and the OLMP through equivalent RLC circuit and open-loop modal analysis.Our investigation is conducted for two types of seriescompensated power systems where either a synchronous generator or a DFIG is connected at the sending end.The investigation reveals the conditions,in which the IGE and the OLMP may jointly cause the growing SSOs,i.e.,both the IGE and the OLMP can explain why the growing SSOs occur.Furthermore,the investigation indicates that the IGE and the OLMP may be totally irrelevant and lead to growing SSOs separately.This implies that it is possible that in a SCPS,the growing SSOs are only due to the IGE,and the OLMP is non-existent,and vice versa.Hence,when the growing SSOs occurs in a SCPS,examination based on both the IGE and the OLMP should be carefully conducted in order to find if the oscillatory instability is due to the IGE,or the OLMP,or both of them.

关 键 词：Induction generator effect open-loop modal proximity series compensation sub-synchronous oscillations 

分 类 号：TM712[电气工程—电力系统及自动化]