华北-华中特高压交直流线路相互作用解析分析  

Analysis on North and Central China UHV AC / DC Interaction

作　　者：汪闻涛[1] 徐政[1] 肖晋宇[2] 王智冬[2] 

机构地区：[1]浙江大学电气工程学院,杭州市310027 [2]国网北京经济技术研究院,北京市102209

出　　处：《电力建设》2014年第12期72-76,共5页Electric Power Construction

基　　金：国家电网公司大电网重大专项资助项目课题(SGCCM PLG001-031-2002)

摘　　要：针对哈郑直流投产、华北-华中特高压交流联网的大背景,根据实际系统建立简化模型,分析了直流发生双极闭锁时交流联络线上功率随两端系统功角差变化的曲线,推导了系统第1摆的稳定裕度计算方法,分析了稳定裕度的敏感因素,得到了临界状态下直流输送功率和交流联络线功率的代数方程组。同时将哈郑直流投产初期丰大方式下华北华中网实际数据代入上述代数方程组进行数值求解,总结出适当减小交流联络线功率,提高直流输送功率可以提高输入受端电网的总功率的优化方案。通过哈郑直流投产初期丰大方式下华北华中网数据仿真验证了结果的有效性。A simplified model was built based on the Hazheng DC commissioning and the North and Central China UHVAC interconnection. The variation curves of pow er flow on the AC lines w ith system＇s pow er angle w as analyzed w hen the DC line w as double-pole blocked. The pow er angle stability margin betw een the tw o pow er grids w as calculated,the sensitivity factors of stability margin w ere analyzed,and the algebraic equations of DC transmission pow er and AC tie-line pow er under the critical condition w ere obtained. Finally,the algebraic equations w ere solved w ith using the North and Central China actual data at the beginning of Hazheng DC commissioning. It is concluded that the total pow er flow ed to the receiving end w ill increase w hen the pow er flow on the AC tie-line is decreased,and the DC transmission pow er is increased. Based on the North and Central China actual data at the beginning of Hazheng DC commissioning,the accuracy and effectiveness of the proposed method has been proved.

关 键 词：直流双极闭锁 特高压交流联网 功角失稳 稳定裕度 输送功率极限 

分 类 号：TM712[电气工程—电力系统及自动化]