Study On Micro - Location Technology Of Complex Terrain Wind Farms Based On

Energy is the important foundation of economic and social development, the new energy is an important direction of future energy. Wind energy as an important part of the new energy.By the end of 2015, China has installed capacity of wind power generation up to 145GW, accounted for 33.6% of global installed capacity. According to the preliminary results of the "13th Five-year Plan " installed capacity of Chinese wind power generation will be up to 250GW by 2020, as a new energy,wind power generation will still develop at high speed in the future.With the rapid growth of wind powergeneration, wind farms with steady wind speed, good construction and transportation conditions have almost been developed completely. some complex terrain reagions(such as mountain ridges, valleys, pass, cliffs, forest cover area, etc.) attact more and more investment because of the better wind acceleration effect. The complex terrain of wind power development is more and more big, the related researchis gradually deppening.Complex terrain can make atmospheric boundary layer turbulent flow, eddy current, and even circumfluence, cause wind speed change at large difference,and turbulence intensity increase, inflow angle exceeds the design value.Then affect the efficiency of wind turbines, destroy the safe running of the wind turbines, reduce the service life of the wind turbines. Therefore, the micro siting in the complex terrain is particularly important.This thesis mainly research on electricity and security of wind turbine which is the focus of micro siting,base on Computational Fluid Dynamics (CFD) software modles Current commercial CFD software of wind farms adopts RANS model, a time average calculation modle.This method has a poor simulated accuracy to turbulent flow, especially in complex terrain, micro topography condition.The software calculation results will be overvalued or undervalued. Such as butte, pass the terrain, the wind speed result is often undervalued, branch in the ridge, windward slope, obstacles and overestimate the wind shadow, the result is often overvalued. At the condition of current technology, and feasible scheme is based on the results of calculation, by summing up experience, careful analysis under the condition of the tiny terrain on wind energy resources, reducing the risk of wind turbines arrangement. In addition, uncertainty assessment is very necessary to wind farms with relatively low generation time (such as average less than 2120h per year).This thesis adopts CFD model to simulate the wind farm model, compares the CFD calculation results, with the actual operation data summarizes the wind generation rule of tiny terrain under complicated topography,which can undertake the CFD calculation results of wind speed under different terrain overvalued or undervalued.Initially forms a set of evaluation method for CFD calculation results error of wind farms.This groundbreaking achievements applied can avoid risk, improve the quality of micro sites in micro siting design.