近振荡中心规模化风电对电网阻尼特性的影响  

Analysis of Influence of Large-Scale Wind Farm Adjacent to Oscillation Center on Damping Characteristics

作　　者：郑超[1] 葛星[2] 霍超 李惠玲[1] 侯俊贤[1] 

机构地区：[1]电网安全与节能国家重点实验室(中国电力科学研究院),北京市海淀区100192 [2]华北电力大学电气与电子工程学院,河北省保定市071003 [3]国网西北分部调控中心,陕西省西安市710000

出　　处：《电网技术》2017年第5期1561-1568,共8页Power System Technology

基　　金：国家电网公司科技项目(XT71-15-005)~~

摘　　要：大扰动冲击后,电网中振荡中心的电压变化幅度大、幅值跌落低,受此影响,其近区风电场功率会出现显著波动,从而加剧风电场与电网交互作用。基于通用电气双馈风机机电暂态仿真模型,分析了并网电压U_s低频跌落与回升过程中,风电场并网系统暂态功率特性,以及不同控制方式对其影响;基于等面积原理,分析了等值电纳B_w的3种典型受扰U_s-B_w轨迹对振荡的影响,并据此揭示了风电场并网系统对电网振荡阻尼的作用机制。通过蒙东外送电网大扰动时域仿真,验证了沽源风电并网系统提升电网振荡阻尼的作用,以及优化风机控制方式增强阻尼能力的效果。After large disturbance, voltage at oscillation center has the lowest amplitude and maximum variation range. Affected by this, significant fluctuations of power of wind farm adjacent to oscillation center will appear, increasing interaction between the wind farm and power grid. In this paper, based on electromechanical transient simulation model of doubly fed induction generator（DFIG） provided by GE Company, transient power characteristics of grid-integrated wind farm and influence of different control modes are analyzed in process of low frequency drop and grid voltage Us recovery. According to equal area principle, effect mechanism of three typical Us-Bwtrajectories on oscillation damping is revealed, where Bw is equivalent susceptance of wind farm. At last, simulation result obtained from Mengdong delivery system with Guyuan wind farm connected verifies that counterclockwise Us-Bw trajectory can enhance oscillation damping characteristics, and that DFIG voltage feedback regulation can further increase damping capacity.

关 键 词：双馈风机 风电场 振荡中心 功率特性 变化轨迹 低频振荡 阻尼特性 

分 类 号：TM712[电气工程—电力系统及自动化]