HE Ai-huan1, ZHANG Rui-ping1, DONG Hai-ying1,2
（1. School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; 2. School of Energy and Power Engineering, Lanzhou Jiaotong University, Wuwei 733000, China）
Abstract： This paper studies on the change mechanisms of the voltage stability caused by the grid connection of front-end speed-controlled wind turbines (FSCWT) integrating into power system. First of all, the differential algebraic equations describing the dynamic characteristics of wind turbines are illustrated. Then, under the guidance of IEEE3 node system model, the influence of the angular velocity of wind turbines, the reactive power and the active power at load bus on the voltage stability of grid-connection has been analyzed by using bifurcation theory. Finally, the method of linear-state feedback control has been applied to the original system in accordance with the bifurcation phenomenon of grid-connected voltage caused by the increase in the active power at load bus. Research shows that voltage at the grid-connected point would be changed with the fluctuation of turbines angular velocity. And increasing its reactive power can enhance voltage at the grid-connected point; problem of bifurcation at the grid-connected point can be delayed when increasing the gain ks of feedback controller within a certain range.
Key words： bifurcation theory; power system; front-end speed controlled wind turbines (FSCWT); voltage stability
CLD number： TM711 Document code： A
Article ID：1674-8042（2018）01-0016-09 doi： 10.3969/j.issn.1674-8042.2018.01.003
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基于分岔理论的含前端调速式风电机组风电场并网电压稳定性分析
何爱欢1， 张蕊萍1， 董海鹰1,2
(1. 兰州交通大学 自动化与电气工程学院，甘肃 兰州 730070； 2. 兰州交通大学 新能源与动力工程学院， 甘肃 武威 733000）
摘 要: 针对前端调速式风电机组并网引起接入电力系统电压稳定性的变化机理展开研究。 首先在IEEE3节点系统模型下用分岔理论定性地分析了风电机组的角速度、 负荷节点的无功功率及有功功率对机组并网电压稳定性的影响； 其次， 针对负荷节点有功功率增加导致并网点电压分岔的现象， 在原系统引入线性状态反馈控制法。 仿真表明： 并网点的电压会随机组的角速度波动发生变化， 增大机组的无功功率可以提高并网点的电压； 在一定范围内增大反馈控制器增益可以延迟并网点的电压分岔现象。
关键词: 分岔理论； 电力系统； 前端调速式风电机组； 电压稳定性
引用格式： HE Ai-huan, ZHANG Rui-ping, DONG Hai-ying. Analysis of grid-connected voltage stability of FSCWT based on bifurcation theory. Journal of Measurement Science and Instrumentation, 2018, 9(1)： 16-24. ［doi： 10.3969／j.issn.1674-8042.2018.01.003］
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