Cyber Physical System Integration Modeling And Control For Active Distribution Network Based On Hybrid System

Information and intelligence are two main features of modern power system.With the continuous expansion of scale and complexity increase,the interaction mechanism of controlled devices and information system in power grid is needed to be understood.Therefore,a concept of Cyber Physical System(CPS)is introduced which has very important significance to realize close integration of power physical system and information system.Currently,power grid has built basic form of CPS.However,from the view of modeling and control,its information system and physical system are lack of integrated description and study.So the two systems are relatively independent.Based on the current research result of CPS,the concept,technical features and target of Cyber Physical System for power grid(Power CPS)is proposed according to power grid's characteristics and demands.Forming the Power CPS integration modeling structure and the Hybrid System is used to model attributes and relationship of primary system and information system.Then,a Model Predictive Control strategy is presented based on the integration model to integrate “continuous characteristic and discrete characteristic” and “physical process and information process” of Power CPS.Also,a Power CPS modeling and simulation platform is designed and built preliminarily including the function modules,information exchange and synchronization mechanism to realize dynamic simulation of control model and control method,and correctness and consistency verification.The Hybrid System model and MPC of Active Distribution Network(ADN)feeder power coordination control and flexible load are studied.The feeder power's distribution modes switching and loads' state transition are included in their continuous dynamic process.Then,the Hybrid System models are used to control the feeder power and flexible loads respectively,and optimize ADN objects such as energy consumption,operation cost,power deviation and so on.The Hierarchical Distributed Control System(HDCS)Hybrid System model and ADN control strategy considering information delay is proposed.According to the properties of HDCS,the HDCS's structure and operation rules is described by logical model.Combining this logical model with Hybrid System model of primary system,an ADN cyber physical integration model is built.With this model,the MPC strategy is presented to optimize both information and energy flow.In this paper,the ADN is as a research background to form the theoretical study and application example of Cyber Physical integration in power grid.The paper has referential significance for further research of power cyber physical system.