Energy Trading Of Microgrid Integrated Distribution Systems Considering Quality Of Service

Microgrid is an important component of smart grid.It can operate either in gridconnected mode or isolated mode.It has features of low cost,low voltage,low pollution and so on.Integrating microgrid into the distribution grid can better distribute the energy resource to supply the users.Accordingly,it can decrease the power loss caused by the transmission,improve the quality of services for power supply,save the investment as well as protect the environment.The development of microgrids in China has been hindered due to the lack of necessary mechanism facilitating microgrids to participate into the energy trading at the distribution grid level.In order to encourage more and more microgirds to participate into the energy trading,this paper proposed a new idea.The paper studied the energy trading of microgrids and distribution grids focusing on improving service of customers.The paper conducted in-depth research and discussion in following questions such as the reliability model of power supply,reliability time-sharing assessment on user-side,service-oriented price model,customer bidding strategy and so on.First,the paper studied the assessment of microgrid user service by using the reliability as the index when micogrids are integrated into the distribution grid.Considering the intermittence and uncertainty of the outp ut of distributed resources,the paper proposed a new model for distributed resources accessment.Based on the network strcture of the system and the output model of distributed resources,the paper used the method of electrical dissecting of paths between sources and flows to analyze the connection between sources and flows.After exploring the source of load power,the paper used minimal path method to study and analyze the reliability change of different loads in one day.Case studies are provided.Compare this method with the traditional method and the results show that adding analysis to sources and flows into the calculation of reliability in microgrid is more accurate and practical,which can well represent the sevice quality of customers.Second,based on the cost analysis of microgrids,the paper proposed the concept of service cost.And based on the sevice cost,the paper established service price models oriented by user's power supply service.The model is established with microgrid insterests maximization as objective and actual operation conditions as constraints.The system cost also took into account the transaction costs that it ismore accurate.Chaos Particle Swarm Optimization is designed to solve price model including time model and service model.Through analysis,we can get that the service price model is reasonable and reliable.Last but not the least,the paper studied the service-oriented microgrid trading mechanism by using the method of static games of incomplete information.Based on incentive compatibility mechanism,the Bayesian game model of user trading strategy considering power supply service is established.The income function of the user and power supply company is designed.The method of solving the Bayesian Nash equilibrium point is deduced to obtain the optimal reporting strategy of users.The analysis of examples show that proposed model can better meet the interests of users and power supply companies.It can effectively avoid the malicious reporting of users aimed at maximizing interests,benefiting to the wealth and efficient power market.