Research On Modeling And Optimized Dispatching Of Highway Microgrid Cyber Physical System

As a convenient and efficient transportation infrastructure,highways play important roles in the process of industrialization and urbanization.Reasonable use of the existing space in the highway area to build distributed power generation and energy storage devices,and the construction of highway micro-grid systems are an effective energy supply method for future highways.However,whether it is the load side or the energy side,there is a large amount of information interaction in its rational allocation and optimal scheduling.Therefore,it is extremely important to consider the modeling and scheduling optimization research from the perspective of Cyber Physical System(CPS).The establishment of the microgrid cyber-physical system model in the highway scenario is first studied from the perspective of modeling in this paper.According to the definition and hierarchical relationship of CPS,the CPS architecture of highway microgrid is built.The system characteristics are analyzed from the two aspects of cyber-physical integration and highway energy consumption,and a layered modeling method is designed to integrate highway microgrid CPS,divided into physical layer,communication network layer and optimized control layer to model respectively: state machine is used to describe the state switching process caused by external control or self-evolution of physical units,and each unit has continuous power output characteristics in each state;According to the function of the communication network,the interface model and the correlation matrix model of the communication network are designed;the optimization and control functions of the optimization control layer are described by the multi-group modeling method.The three-layer models are combined to form a system-level CPS.The simulation results show that when the system maintains power balance,the operating status and control process of each unit can be displayed intuitively,which effectively improves the observability of the system.On this basis,the optimal scheduling problem of highway microgrid CPS after it is connected with the large power grid is studied.Aiming at the lowest single-day operating cost of the microgrid,under the conditions of power balance and distributed power output constraints,a rolling optimization scheduling model based on Model Predictive Control(MPC)is established,and the output of each unit is reasonably scheduled.With the power purchase based on the time-of-use electricity price,the system economy is optimized.Taking the microgrid in the service area of Guangxi Highway as an example,two scenarios of the normal operation state and the emergency maintenance state of the micro-grid in the service area were selected for simulation verification.The results show that the designed optimal dispatching model can reduce the operating cost of the system and reduce the load peak-valley difference in both scenarios,which verifies the effectiveness and rationality of the optimized dispatching model in solving the economic problems of highway microgrids.The research results of this paper have theoretically enriched the theoretical method system of highway microgrid CPS modeling and optimal dispatching,provided a basis for realizing the optimal control of expressway microgrid,and have certain theoretical research and practical guiding significance.