Operation Process and Response Characteristics of the Wind Turbines Under Complex Terrain Using a Multi-scale Coupling Model

Abstract

A multi-scale coupled model of wind farms simulation combined with mesoscale and micro-scale models is newly developed in the present work. The mesoscale simulation is based on mesoscale wind farm parameterized (WFP) coupling model WFP-WRF, while the micro-scale calculation using large eddy simulation coupling wind turbine control method. Based on the WRF-CFD coupled model, the multi-scale simulations of the flow field and operation characteristics of an onshore wind farm under complex terrain are carried out. The accuracy of wind power output results based on the mesoscale WFP-WRF model and the multi-scale WRF-CFD model is tested on the basis of the wind farm operation data, the results show that compared to the mesoscale WFP-WRF model, the WRF-CFD multi-scale model has obvious advantages in capturing the flow details and improving the simulation precision of the wind farm. Then, the influence of wake interference on the operating characteristics of downstream wind turbines is discussed. Final, this paper considers the three conditions of the wind turbine on the upwind of the slope, the top of the slope and the downwind of the slope, respectively, and explores the influence of the terrain on the flow field around the wind turbine and the operating characteristics of the wind turbine. The multi-scale coupled simulation platform developed in the present work can be used to assist the macro-siting and micro-siting of wind farms and has important engineering application value.