Research And Application Of Power System Planning Considering Large-Scale New Energy Power Integration

Developing new energy is of great strategic significance to boost China's energy reform and transform the energy structure.New energy resources in our country,which have a large number,are relatively concentrated distributed and far away from the load center.Thus large-scale exploitation and centralized grid connection should be adopted to develop the new energy.Due to the imperfect new energy technology and the incomplete power grid construction,the utilization rate of new energy constantly declines while the installed capacity has a sharp rise.The accomodation of new energy becomes a bottleneck in the development of China's new energy.To acquire the accurate data of new energy output for operation simulation of power system,this thesis studies the characteristics and reconstruction of wind power output for the system planning and operation simulation.From point of view of time effect and space effect,this paper proposes the evaluation index system based on analyzing the characteristics of the random fluctuation of wind power output and evaluating them quantitatively.Then the reconstruction of wind farm output considering multiple time scale is done to avoid the defect of simulation of wind farm output with empirical distribution.The effectiveness of this reconstruction algorithm is verified by an actual wind farm data.The new energy generation,such as wind power and photovoltaic power,is relatively random and uncertain compared with the traditional power generation.To establish reasonable simulation models of the new energy output and power system operation,the characteristics of new energy generation should be considered during the power system planning.This paper optimizes the modeling of operation simulation of power system with large-scare new energy.To achieve different operation simulation targets,this paper puts forward the characteristic indexes of new energy output and the method of selecting typical scenarios of new energy output.It is an integral part of power system planning to build the power exchange models of transmission lines connecting provincial power systems and the operation simulation models of regional interconnected power systems.Based on the above research,an optimized model for operation simulation of power system with large-scale new energy is presented with the constraints of system operation and the coordination of multiple power generations.Furthermore,the proposed model and method are applied to an actual power system with long-term and short-term operation constraints separately.To give a guidance for the large-scale new energy accomodation,the optimization planning method of improving the new energy accomodation is studied,considering the power generation with joint wind power,photovoltaic power and energy storage as well as the power transmission with wind-thermal-bundled system.Based on the comparative analysis of different load and power output characteristic s,the key factors affecting the new energy accomodation are investigated.Then the paper proposes the optimal capacity configuration process of joint wind pow er,photovoltaic power and energy storage system.The optimization planning method of wind-thermal-bundled system is presented.Meanwhile,the configuration process and the method are also verified in an actual power system planning.This paper has a practical effect on the research of new energy accomodation in regional interconnected power system and the planning of power system.