提出一种适用于大型风电场的自适应频率响应控制方法,使风电场能参与电力系统频率调节。低频事件发生后,每台风电机组的下垂控制系数均根据其本地实时风速和功率裕度呈反比例自适应调节。高频事件发生后,每台风电机组的高频响应控制增益随其本地实时风速自适应调节。由此,风电场频率响应支撑功率可自适应的在多台风速各异的风电机组之间实现合理分配。该方法充分考虑频率响应过程中多台风电机组之间的风速差异,不仅可提高风电场整体的频率响应能力,而且可确保频率响应过程中每台风电机组的稳定运行。在Matlab环境下进行相关仿真实验,结果验证了所提控制策略的有效性。
Abstract
This paper presents an adaptive frequency response control scheme for the large scale wind farm. This scheme enables wind farm to participate the grid frequency regulation. The main advantage of this scheme is that, during the frequency response, by adaptively adjusting the droop coefficient and control gain according to local wind speeds, this scheme takes into account the wind speed difference among wind generators. Specifically, the droop coefficient of each wind generator is dynamically adjusted inversely proportionally to the local power margin, while the over-frequency control gain is obtained by solving a linear programming problem, which is also formed based on the local wind speed. This way, during the frequency support, the power contribution is allocated among multiple wind generators in an adaptive and reasonable fashion. As a result, not only the wind farm frequency support performance is improved, but also the wind generator stability is ensured. Simulation results on the data collected from a real wind farm validate the effectiveness of the proposed control scheme.
关键词
频率响应 /
风电场 /
风电机组 /
风速 /
电力系统
Key words
frequency response /
wind farm /
wind turbines /
wind speed /
power system
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基金
国家电网陕西省电力公司科技项目（SGSNKY00DYJS1900288）
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