长链式交直流混合电网振荡特性及优化措施研究  

Research on Instability Characteristics and Optimization Measures of Long-chain AC/DC-Hybrid Grid

作　　者：梁红胜 汤凡 邹福强 吴冲 王媛 罗宣平 LIANG Hongsheng;TANG Fan;ZOU Fuqiang;WU Chong;WANG Yuan;LUO Xuanping(UHV Construction Branch of State Grid Corporation of China,Beijing 100032,China;Southwest Branch of State Grid Corporation of China,Chengdu 610021,China;Southwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Chengdu 610056,China)

机构地区：[1]国家电网有限公司特高压建设分公司,北京100032 [2]国家电网有限公司西南分部,四川成都610021 [3]中国电力工程顾问集团西南电力设计院有限公司,四川成都610056

出　　处：《电力勘测设计》2023年第9期1-5,18,共6页Electric Power Survey & Design

摘　　要：山区环境因素复杂、气候恶劣使得电网极端故障发生的几率远高于其他地区,长链式交直流混合电网承受极端故障的能力面临极大考验。极端故障容易诱发长链式电网发生失步振荡,而交直流混合电网在故障过程中及故障清除后的交直流耦合稳定特性则会进一步导致失步振荡的特性变化,常规的第三道防线措施难以适应,无法准确隔离故障保持电网稳定。分析一个典型的长链式交直流混合电网发生极端故障后主要断面的振荡特性,识别极端故障导致长链式交直流混合电网整体与主网解列后的电气量特征,提出基于失稳特征的第三道防线优化措施建议。经过仿真验证,该优化措施能有效根据功角、频率等特征,实时选择最优的控制措施,最大程度地保证电网安全稳定运行。Owing to the complex environment and harsh climate,extreme failure of the grid seems to be a high probability.The stability of grid is facing great challenge.The extreme failure might cause the grid out of step,especially the long-chain AC/DC-hybrid grid.Traditional method is hard to adapting the situation.In this article,the oscillation characteristics of long-chain AC/DC-hybrid grid is analyzed.The electrical quantity characteristics caused by extreme failures is identified.And an optimization method based on the instability characteristics is proposed.Simulation results have proved that the method is efficient to ensure the stability of the grid in full measure.

关 键 词：长链式交直流混合电网 振荡特性 极端故障 第三道防线 

分 类 号：TM712[电气工程—电力系统及自动化]