尾流效应和时滞对风电场输出特性的影响

Impacts of Wake Effect and Time Delay on Output Characteristics of Wind Farm

由于大型风电场风电机组数量众多,占地面积较大,风电机组间尾流效应和风速时滞将对风电场并网点输出特性有较大的影响。以定速机组风电场为例,在电磁暂态仿真软件PSCAD/EMTDC平台上,搭建了25台750kW风电机组组成的风电场模型。分析和比较了不同风速模型的风电场输出特性。结果表明,时滞会平滑风电场输出功率,使得并网点功率变化率变小,从而提高其电能质量;尾流效应会造成风电场的风能损失。在风电场接入电网检测中,需要考虑尾流效应和时滞的影响。

Due to the large number of wind turbines and covering too large area in a large wind farm, wake effects among the running wind turbines and wind speed time delays will have a greater impact of wind farms models. Taking fixed speed wind farm with stall-controlled wind turbines as an example, wind farm model with twenty-five wind turbines is built on electromagnetic transient simulation software PSCAD/EMTDC platform. Through the example analysis of wind farm output characteristic on different wind speed models, the results show that time delay will smooth wind farm power output and make the power change rate smaller, and thus enhance power quality at point of common coupling. Wake effects can cause the wind energy loss. The grid-connection detection of wind farms need to consider wake effects and time delays.