摘要
随着交直流混联电网规模不断扩大,稳定特性愈趋复杂,功角失稳和电压失稳常常相互交织不易区分,快速准确判别主导形态是实施针对性控制措施的重要前提。首先,基于3种典型系统,分析支路无功在不同失稳形态下的时空分布特性,提取特性间的差异化特征;其次,结合支路首、末端的无功乘积及电压幅值乘积,构建具有固定临界值和明确物理意义的主导性判别指标,用以指示主导失稳形态的同时,还可判别垂足电压落点位置;最后,利用电压幅值乘积指数辨识关键支路,在此基础上,提出主导失稳形态判别及紧急控制策略。标准算例和实际交直流混联电网的仿真结果验证了所提方法及策略的有效性。
With the continuous expansion of the AC/DC hybrid power grid scale,the stability characteristics become more complex,and rotor angle instability and voltage instability are often interweaved and difficult to identify.A fast and accurate methodology that identifies the dominant mode of coupling instability is the priority of targeted emergency control strategy.In this paper,temporal and spatial variation characteristics of branch reactive power is analyzed based on three typical systems,and differentiating features between temporal and spatial variation characteristics are extracted.Then,combined with the reactive power product and the voltage product at both ends of the branch,the identification indicator with fixed critical value and clear physical significance is proposed to indicate the dominant mode of coupling instability as well as to determine the position of vertical voltage drop point.Finally,voltage product is utilized to identify the critical branch,and a discrimination method of the dominant mode and the emergency control strategy are proposed.The proposed method and strategy are validated based on the standard system and the AC/DC hybrid power grid.
作者
李宗翰
孙华东
郑超
徐式蕴
赵兵
LI Zonghan;SUN Huadong;ZHENG Chao;XU Shiyun;ZHAO Bing(National Key Laboratory of Grid Security(China Electric Power Research Institute),Haidian District,Beijing 100192,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2023年第13期4883-4898,共16页
Proceedings of the CSEE
基金
国家重点研发计划项目(2021YFB2400800)。
关键词
功角失稳
电压失稳
主导形态
紧急控制
rotor angle instability
voltage instability
dominant mode
emergency control
