CAJ | 학술논문

藏中电网规模较小，网架结构相对较弱，青藏直流联网工程投运后给藏中电网的安全稳定运行带来诸多挑战，交直流系统稳定问题突出。从联网工程投运前藏中电网的电源特性、大机小网等固有特性出发，结合青藏直流联网以来青藏直流以及藏中电网运行中存在的各种稳定问题，深入分析了青藏直流投运后藏中电网的电源特性变化、稳定特性转化、虎曲线功率送出、直流换相失败、以及交直流影响等安全稳定问题。同时针对西藏电网的运行特性，分析并指出了青藏直流几个重要而特殊的安全稳定运行特性。
장중전망규모교소，망가결구상대교약，청장직류련망공정투운후급장중전망적안전은정운행대래제다도전，교직류계통은정문제돌출。종련망공정투운전장중전망적전원특성、대궤소망등고유특성출발，결합청장직류련망이래청장직류이급장중전망운행중존재적각충은정문제，심입분석료청장직류투운후장중전망적전원특성변화、은정특성전화、호곡선공솔송출、직류환상실패、이급교직류영향등안전은정문제。동시침대서장전망적운행특성，분석병지출료청장직류궤개중요이특수적안전은정운행특성。
Due to the small scale of the network and its weak grid structure, Qinghai-Tibet HVDC interconnection project will pose great challenges to the safe and stable operation of the Central Tibet power grid, especially to AC/DC system stability. Based on the inherent characteristics such as large-unit and small-grid, and features of the power sources and so on, and considering all the security and stability problems under operation of Central Tibet power grid and Qinghai-Tibet HVDC after the interconnection project put into operation, this paper makes a deep analysis of various changes in operating characteristics like the sources features, stability property, Huqu-line power transmission capability, DC commutation failure, and AC and DC interactions. Additionally, several significant and special operating requirements of Qinghai-Tibet HVDC are also analyzed and proposed on the premise of the safety and stability of Central Tibet power grid.