Electric Vehicle Charging Dynamic Decision Model Based Photovoltaic Micro-grid Communication Service

As two new national strategic industry,New Energy Vehicles and Distributed generation are developed widely and vigorously under strongly supported by government. The micro-gird under smart grid emerged, and its model of ‘Plug and Play’ will bring preponderance in following aspects, reducing the electric cost for power grid, improving quality of power supply and realizing intelligentization. V2 G technology, as a new energy interaction technology, can give full play to its economy, flexibility and accessibility under the application environment of micro-grid, can be used in combination with distributed generation which has randomicity and intermittence under micro-grid, such as photovoltaic generation and wind generation to maximize the preponderance. United IEC 61850 Communication Standards will provide technical support for parametric communication among varied distributed units under micro-grid. This article is grouped around following aspects:(1)Emphaticallyanalyzing the real-time communication requirements between electric vehicles as distributed generation and intermittent generation, starting with electric vehicle charging and discharging policy and wind output coordinated optimization, established goal functions and constraint conditions of mathematical model; starting with the analysis of following three models,V2 G system requirement models under micro-grid, V2 G battery charger modeland V2 G system requirement models considering photovoltaic output, to obtain charging behavior requirement power of electric vehicle unit, to get the communication requirements between electric vehicle unit and photovoltaic generation unit.(2)Introducing the IEC 61850 Standards to micro-grid as power system communication standards, establishing layered communication structure in micro-grid; according to the naming rules and abstract methods of logic nodes in IEC 61850, proceeding the study on the logic nodes, data, data attributes, and data classification corresponding to the function that electric vehicle relying on V2 G charging station can implement communication under micro-grid, particularly researching the logic nodes which are not defined in the standards; by abstracting logically the V2 G charge station, establishing the data communication model of V2 G charge station and its relevant devices under micro-grid according to IEC 61850-7-420.(3)Studying reporting mechanism, designing the communication service model, report control block RCB and report trigger mechanism based reporting mechanism; taking the power batteries life span estimation for example to study on parameter synchronous communication, designing the parameter synchronous communication scheme based replacement of data object value; Designing the trigged report was and implementing report message through programming. Designing and validating the report service process and operation interface by simulated experiment.(4)Analyzing the randomicity of PV generation, then obtaining beta distributed model of PV output. The nondeterminacy based on PV output combining markov decision process established an electric vehicle charging dynamic decision model. Establishing PV power generation unit active power output real-time parameter Synchronous reporting mechanism between electric vehicle and PV generation unit, and establishing the hardware platform to analyze the communication service by simulated experiment.