Capacity Credit Calculation Of Distributed Power Generation And Its Application

In recent years,with the continuous development of new energy technology,the rise of wind power generation,photovoltaic power generation and other emerging industries has brought new vitality to the traditional power system.Due to the limitation of natural conditions,the output of new energy generation is volatile and unstable.The integration of new energy makes the reliability and economy of power system suffer a certain impact and challenge.Therefore,it is of great practical significance to study the output and grid-connected characteristics of new energy and its impact on the power system for the promotion and application of new energy technology.Firstly,this paper introduces the definition of credible capacity of uncertain energy sources in distributed generation,and gives the calculation method and flow chart of credible capacity from the point of load side.According to the system reliability index based on load side,such as the EENS,referring to the exponential relationship between credible capacity and reliability index,the mathematical methods such as dichotomy or chord truncation are used to search for a certain value.At last,the reliability of distributed generation capacity is determined according to the installed capacity of distributed generation.Then the credible capacity of AC/DC hybrid microgrid with distributed power sources such as wind power generation,photovoltaic power generation,energy storage and so on is studied with AC/DC hybrid microgrid.The concept of trusted capacity of AC/DC hybrid microgrid is defined,and its reliability is calculated by sequence operation method,including the sequence calculation of wind-solar storage,load serialization and reliability index,so as to evaluate the credible capacity of AC/DC hybrid microgrid.The results of reliability and reliability capacity are analyzed by an example,and the effects of the ratio of wind and solar energy and the change of DC load on the results of credible capacity calculation are explored.After that,taking distributed roof photovoltaic as the research object,the credible capacity of roof photovoltaic power generation is evaluated.Considering the influence of the increase of the scale of electric vehicles on the power consumption of urban users,according to the travel rules and charging and discharging strategies of electric vehicles,the relevant reliability index of electric vehicles is established,and the reliability system of urban users' power consumption is constructed.On this basis,the credit capacity of roof photovoltaic power generation was assessed.Finally,based on the calculation of roof photovoltaic credible capacity,static cooperative game theory is introduced to analyze the cooperative game relationship among roof photovoltaic,electric vehicle and residential users in intelligent community.The strategy space and overall game model of each player are established.The objective function is the EENS,and the minimum winning coalition algorithm is used to solve the problem.The roof photovoltaic capacity is optimized,and the effects of the input of electric vehicles and load peak and valley regulation on the optimization results are analyzed.