摘要
提出了一种基于变速恒频双馈电机的风电场电压控制策略,该策略以风电场出口升压变压器高压侧电压为控制目标。介绍了该控制策略的总体结构,阐述了风电场高压侧电压控制的原理,并考虑风电场无功功率极限,研究了无功功率控制、分配和故障情况下紧急电压控制方案。针对风速扰动和电压骤降2种情况进行了仿真。仿真结果表明,所提出的控制方案与功率因数控制和传统的电压控制策略相比可以明显地提升风电场电压水平,且无需高压侧信号、经济有效。
A voltage control strategy is introduced for wind farms using the doubly fed induction generator （DFIG）. The strategy aims at controlling the voltage at the wind farms step-up transformer high voltage side. The overall configuration of voltage control and the principal are described, taking into account of the reactive power limits of wind turbines. The reactive power control, distribution and emergency voltage control under the system fault conditions are also studied. Both wind-speed variation and voltage-sag are simulated to compare the dynamic responses of the system with power factor control and traditional voltage control. Simulation results show that the voltage control strategy can maintain the wind farm voltage level without any additional feedback signal from high voltage side of the step-up transformer. The control strategy is proved to be economical and efficient.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第4期87-91,共5页
Automation of Electric Power Systems
关键词
风电场
双馈电机
变速恒频
高压侧电压控制
无功功率控制
紧急电压控制
wind farms
doubly fed generator
variable-speed constant-frequency
high side voltage control
reactive power control
emergency voltage control
