Research On Photovoltaic Consumption Of Cyber Physical System Based On Power Electronic Transformer

With the depletion of fossil energy and the increasingly serious environmental problems,the new energy power generation technology represented by distributed photovoltaics has developed rapidly,reducing the high pollution and high energy consumption of thermal power generation in power generation.On the other hand,the intermittent and decentralized geographical distribution characteristics of photovoltaic power generation are not conducive to centralized optimization and coordinated control of the network.This leads to the phenomenon of abandonment of light,which makes China's photovoltaic power generation utilization rate low and poor economic benefits.Power electronic transformers have energy collection and distribution functions and can provide various forms of standardized interfaces.The establishment of an AC / DC hybrid system based on power electronic transformers can provide physical support for photovoltaic access and large-scale interconnection.The application of the communication system and the dispatch control system can enhance the controllability of the power grid.On the basis of the power electronic transformer forming the grid of the power grid,combined with the communication system and the dispatch control system,an information physical system based on the power electronic transformer is established to accommodate photovoltaic Provide more flexible dispatch control methods to achieve a higher level of photovoltaic consumption.This dissertation first introduces the topology and working mode of the power electronic transformer.The power electronic transformer includes four ports: power grid port,interconnection port,AC load port and DC load port.This paper introduces the construction methods of physical system,communication system and dispatching system based on power electronic transformer.Based on this cyber-physical system,two methods are proposed,namely,optimized scheduling and real-time optimized scheduling of photovoltaic consumption.Then,the mathematical model of optimal scheduling was established,including four-port power electronic transformers,energy storage devices,energy constraints of gas turbines,and power balance conditions within and between station areas.It is solved by taking the maximum consumption and the most economic operation of photovoltaic as the objective function.The calculation result proves the effectiveness of the photovoltaic physical information system based on power electronic transformer.However,the dayto-day scheduling optimization relies on the accuracy of photovoltaic forecasting and load forecasting.In order to ensure the safe operation of the system,on the basis of formulating the production plan by the day-to-day optimization scheduling,real-time scheduling optimization is also added to ensure the reliable consumption of photovoltaics and the safe operation of the system.In order to verify the feasibility of real-time optimization,an information physics system co-simulation platform combining ADN-SIM,OPNET and LABVIEW was built for the three-layer system of information physics system.And on this basis,the simulation model of physical layer,communication layer and scheduling layer is built.In connectivity,the accuracy verifies the platform function of the joint simulation platform.Three simulation scenarios of photovoltaic penetration rate were set up,and the effectiveness of real-time optimal scheduling of photovoltaic consumption in an information physics system based on power electronic transformers was verified through simulation experiments.It proves the role played by the system in photovoltaic consumption.