大规模风电与直流综合作用对送端系统暂态稳定影响机理  

Influence Mechanism of Comprehensive Action of Large-Scale Wind Power and HVDC Transmission System on Sending System Transient Stability

作　　者：江琴 刘天琪[1] 曾雪洋 艾青 印月[1] 刘明忠 JIANG Qin;LIU Tianqi;ZENG Xueyangl;AI Qing;YIN Yue;LIU Mingzhong(College of Electrical Engineering and Information Technology, Sichuan University, Chengdu 610065, Sichuan Province, China： 2. State Grid Sichuan Electric Power Research Institute, Chengdu 610072, Sichuan Province, China)

机构地区：[1]四川大学电气信息学院,四川省成都市610065 [2]国网四川省电力公司电力科学研究院,四川省成都市610072

出　　处：《电网技术》2018年第7期2038-2046,共9页Power System Technology

基　　金：四川省科技厅重点研发项目(2017GZ0054)~~

摘　　要：风火打捆交直流外送系统提高了我国新能源的利用率,风电与直流系统共同影响着系统的暂态稳定。针对含大规模风电接入经交直流非并联送出的三区域系统,分析了双馈风机与直流系统的运行特性及对送端系统的影响,将两者的综合作用等效为系统的等值机械功率增量,推导了相应的转子运动方程,得到三区域系统暂态功角稳定分析模型。根据该模型基于扩展等面积定则揭示了大规模风电与直流系统综合作用对送端系统暂态稳定的影响机理,研究了不同故障类型下系统的暂态稳定性。最后通过仿真验证了所提理论的正确性,为大规模新能源跨区域传输的开发利用及其稳定控制提供了理论基础。With emergence of bundled wind-thermal-power transmitted with AC/DC system, utilization of renewable energy in China is improved, and comprehensive action of wind power and HVDC system affects transient stability of the system. For a three-area system with large-scale wind power integrated and transmitted with AC and asynchronously interconnected HVDC system, operating characteristics of doubly-fed induction generator（DFIG） and HVDC system and their influence on sending system are analyzed. Corresponding equation of rotor motion is derived, and the model for transient angle stability analysis of the three-area system is obtained with equivalence of the influence to increment of mechanical power. According to the model, influence mechanism of comprehensive action of wind power and HVDC system on sending system transient stability based on extended equal area criterion（EEAC） is revealed. Transient stability of the system under different faults is studied. Finally, simulation results confirm validity of the mechanism analysis. It provides theoretical foundation for utilization of trans-regional transmitted large-scale renewable energy and its stability control strategy.

关 键 词：大规模风电接入 交直流混联系统 扩展等面积法 等值机械功率 暂态稳定 

分 类 号：TM721[电气工程—电力系统及自动化]