耦合风电场参数化模型的天气预报模式对风资源的评估和验证

Wind resource assessment of weather research and forecasting model coupled with wind farm parameterization model

为了验证耦合风电场参数化模型的天气预报模式(WRF-WFP)对大规模风电场风资源特性评估的准确性,以我国河北省张北县百万千瓦风能基地为研究对象,分别采用耦合与未耦合风电场参数化模型的天气预报模式开展相关的模拟试验,利用在平坦及复杂地形场区的测风塔的观测数据对风速及其概率密度函数分布以及风向进行验证分析.研究结果表明:耦合与未耦合风电场参数化模型的天气预报数值模式对风资源特性的评估均有较高的可靠性,且对平坦地形区域的模拟精确性优于山地地形区域;由于前者考虑了风电场的尾流效应,对风速预测的精确性比后者高约4.5%.该数值模式可为风能丰富地区的风电场微观选址、大规模风电场的运行特性及其对大气边界层影响的评估提供可靠的技术支撑.

To validate the accuracy of evaluating the wind resource characteristics on large-scale wind farms by the weather research and forecasting model coupled wind farm parameterization model(WRF-WFP),the numerical experiments were performed using coupled and uncoupled WFP models respectively,with a gigawatt-scale wind power base in Zhangbei County of Hebei Province as research objective.The wind speed and its probability density function distribution,and wind direction were validated by the observed data from two wind masts on flat and complex terrain regions.Results showed that the WRF models of coupled and uncoupled WFP model both had high accuracy for assessment of wind resources and the simulation accuracy for the flat region was better than that for the mountain region.However,the accuracy of the coupled model was 4.5%higher than that of the uncoupled model due to the consideration of wind farm wake effects.The proposed numerical model can provide reliable technical support for micro-siting of the wind farm with rich wind resources,and assessing the operational characteristics of large-scale wind farms and their atmospheric impacts.