LCC-HVDC系统整流–逆变交互振荡模式稳定变化特征及机理研究  

Study on Characteristics and Mechanism of the Stability Moving Trend of Rectifier-inverter Interactive Oscillation Mode for LCC-HVDC System

作　　者：杨硕 郭春义 张加卿 刘晓颖 YANG Shuo;GUO Chunyi;ZHANG Jiaqing;LIU Xiaoying(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《中国电机工程学报》2023年第16期6181-6191,共11页Proceedings of the CSEE

基　　金：国家自然科学基金项目(52277093)。

摘　　要：LCC-HVDC系统联接弱交流系统时,整流站和逆变站之间存在强交互作用。研究发现,对于弱交流系统场景,LCC-HVDC的整流侧和逆变侧交流系统在不同短路比(short-circuit ratio,SCR)组合下,系统稳定性由整流–逆变交互振荡模式主导,且随定电流控制参数的改变呈现“单调–非单调”更迭现象。该文通过阻尼比特性曲线和参数灵敏度研究该“单调–非单调”更迭现象的产生机理,指出该现象是由两端交流系统强度相互制约下的整流–逆变强交互作用导致,体现出系统稳定性趋势的“木桶效应”,即LCC-HVDC系统的稳定性趋势由所联接交流系统强度弱的一侧换流站主导。基于PSCAD/EMTDC的详细电磁暂态仿真,验证整流–逆变交互振荡模式稳定变化趋势的“单调–非单调”更迭现象。该研究可为掌握实际工程交互作用振荡模式及选取合理控制参数提供理论支撑。When the LCC-HVDC system is connected to the weak AC system,there exists strong interactions between the rectifier and inverter station.This paper finds out that in weak AC systems,under different combinations of rectifier-and inverter-side AC system strength(featured by short-circuit ratio(SCR))of the LCC-HVDC system,with varying constant DC current controller parameters,which are dominated by the rectifier-inverter interactive oscillation mode,the whole system stability behaves as the‘monotonicity-nonmonotonicity’alternation variation characteristic.Then,by means of damping ratio characteristic curve and parameter sensitivity analysis,the mechanism of‘monotonicity-nonmonotonicity’alternation phenomenon is investigated.The results show that this phenomenon is caused by the rectifier-inverter strong interactions under the mutual restriction of the AC system strength at both sides,which reflects the‘barrel effect’of the system stability,that is,the stability moving trend of the whole LCC-HVDC system is dominated by the converter station whose AC system strength is weaker.Finally,the PSCAD/EMTDC simulation results verify the above‘monotonicity-nonmonotonicity’alternation phenomenon of the stability moving trend of the rectifier-inverter interactive oscillation mode.This study can provide theoretical support for having a command of interactive oscillation mode in the practical engineering and selecting reasonable control parameters.

关 键 词：LCC-HVDC 交流系统强度 定电流控制器 整流–逆变交互振荡模式 “单调–非单调”更迭现象 

分 类 号：TM73[电气工程—电力系统及自动化]