Evaluating The Potential And Environmental Benefits For Wind Energy Integration In Regional Power Systems

As a major solution to address the exhaustion of fossil fuels and to curb the carbon emis-sion,renewable energy is developing rapidly in China.To achieve China's ambitious energy target of feeding 15%and 20%of its primary energy consumption with renewable energy by 2020 and 2030 respectively,and to utilize the clean energy transformation to alleviate the severe air pollutions,renewable energies will keep growing fast in China.Because of lack-ing deep understandings of the integration potential and the environmental benefits of wind energy,it has experienced unbalanced developments in different regions,which has led to severe wind curtailments and inefficient utilization of wind energy in the haze governance.To address this problem,accurately evaluating the integration potential and environmental benefits of wind energy is necessary.This thesis reviews the literature about evaluating the potential and environmental ben-efits for renewable energy integration in regional power systems.To address the shortages of the reviewed works and to provide solid tools for guiding the rational development of wind energy,this thesis systematically studies the methods of evaluating the integration potential and environmental benefits of wind energy integration in regional power systems.Major works carried out in this thesis are as following:Firstly,a chronological operation simulation framework for regional power system un-der high penetration of renewable energy is proposed.The proposed framework could cal-culate power output for any wind or solar farms with metrological and geographical data,and incorporates a time-domain partitioning method and a roll-back mechanism to provide reliable simulation results within one hour of computation time.The feasibility and accuracy of the proposed simulation framework are verified by comparing simulation results of the Northwest China Grid in 2015 with official statistics.The proposed framework provides the basic analyzing method for evaluating the integration potential and environmental benefits of wind energy.Secondly,based on the chronological operation simulation framework,a method of evaluating the potential for wind energy integration in regional power systems is proposed.The proposed method is composed of three parts:a resource potential evaluation method,a scenario sweeping method for wind power accommodating in the power system and an economic integration potential calculating method.With the proposed method,the grid-integrated potential of wind energy in Northeast China Grid in 2025 is evaluated.Based on the evaluation results,advice for renewable energy supporting policies are given.Thirdly,five measures for improving the wind power integration in China are analyzed.Mathematical models for inter-provincial renewable electricity market and reserve market,improving the flexibility of coal-fired generators,improving the accuracy of wind power forecast,installing heat boilers and demand side management are built based on the proposed chronological operation simulation framework.And the cost effectiveness of the analyzed five measures is compared in the Northeast China Grid for 2025.Finally,a method of evaluating the environmental benefits of wind energy integration is proposed.The proposed method connects the power system operation simulation and WRF-Chem atmospheric chemistry simulation,and could accurately simulate the differences in the formation and transportation of PM2.5 in the atmosphere before and after wind energy integrated into the power system.The environmental benefits of wind energy integration in the Northeast China Grid in 2025 are then evaluated with the proposed method.