| Photovoltaic is a mature power generation with rapid development and wide application.Nowadays,photovoltaic is gradually developing into small-scale distributed system.However,due to environmental factors,the output of photovoltaic is unstable,so that it is difficult to connect directly to the grid or for users.The energy storage battery has many advantages,such as fast response speed,accurate compensation,etc.,which can effectively compensate for the drawbacks of photovoltaic power generation technology.In this paper,the distributed photovoltaic energy storage systems is discussed,and the main work is as follows:Firstly,the mechanism and classification of power demand response are briefly described.The means of user side load participating in power demand response is analyzed,and the mathematical model of load participation in power demand response is proposed.Secondly,the different ways and advantages and disadvantages of energy storage battery integration into photovoltaic system are analyzed in detail,and the overall design scheme of the system is proposed for civilian distributed photovoltaic energy storage system.Thirdly,according to the structural design of the system,the configuration methods of power storage and energy storage are discussed respectively,and the effectiveness of the method is analyzed by simulation.Fourth,according to the layered architecture design of the energy management system,an energy management method based on hierarchical scheduling is proposed,and the effectiveness of energy management method is analyzed through simulation.In this paper,the energy storage configuration problem and energy management problem of distributed PV energy storage system are discussed in depth.Firstly,based on the difference compensation method,a differential dynamic compensation method based on the state of charge of the energy storage battery is proposed to smooth the output of photovoltaic,which not only ensures the stability of the photovoltaic output,but also reduces the risk of the charge state of the energy storage battery.Secondly,the autonomousity is introduced as a measure of the stability of the off-grid operation of the grid-connected photovoltaic energy storage system,and the ergodic algorithm is used to obtain the autonomy of the system operation under different energy storage configurations.The simulation shows that the ability of the user side load to participate in the system energy coordinated control is fully considered during the operation of the system,which greatly reduces the system's configuration requirements for the energy storage battery.Finally,the non-cooperative game theory and dynamic regulation are used to model and solve the regional energy scheduling and user energy management respectively,which not only improves the economic benefits of grid-connected operation,but also meets the user's electricity demand and avoids the emergency purchase and sale of electricity. |
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