Research On Operation Control Of Microgrid With High Permeability And Renewable Energy

Distributed generation is one of the important ways for the development of renewable energy.Microgrid is an important integration form of distributed renewable energy generation.It can realize the high penetration of Distributed Renewable Energy access with advanced and flexible operation mode.With the development of Energy Internet and Active Distribution Network(ADN),distributed generation and microgrid will be utilized on a large scale in the future.Microgrid with a large scale of renewable energy will embed distribution network with a high penetration,which will change the distribution network power flow and the properties of network.The characteristics of intermittent renewable energy will lead to dramatic changes in grid tie line power,to renewable energy consumption and power system power regulation difficult,at the same time to the safe operation and scheduling optimization of distribution network and the superior power network challenges.In this paper,based on the future ADN environntent,the grid-connected tie-line power flow control strategy of Wind/PV/battery microgrid is studied.The main work is as follows:Firstly,after comparing the typical topology structure of the photovoltaic battery generation system,the topology structure of the micro grid in this paper is designed.The structure can is based on reducing the primary equipment quantity,give full play to the energy unit power regulation and control node,improve the system flexibility and scheduling,to meet the system reliability under the condition of increasing scenery storage microgrid on the internal power supply scheduling dimension.Secondly,in ADN environment,the scenery storage of microgrid power fluctuation and scheduling problem is formulated to tie line power smoothing target and calculation method of scheduling period based information interaction,namely the tie line power control strategy of constant time.In order to realize the distributed microgrid renewable energy power coordinated control,to ensure grid tie line power is constant,designed two layer hierarchical control structure.The central controller considering their own conditions of operation and dispatching of active distribution network needs to realize the coordination control system operation mode selection and controller switching.The local controller realize realtime balance between supply and demand of microgrid,at the same time,maintain the stable operation of the system.Finally,considering the random variation of the wind speed and light intensity in the operation of the wind/PV/battery microgrid,the typical wind speed and light conditions are selected,so that the system can run continuously in all possible operating modes.The above conditions are built in the Matlab/Simulink environment simulation scenery storage microgrid power control strategy based on the example,the use of Stateflow toolbox for operation state transition strategy,realize the system of all the running state of real-time continuous seamless handoff,the simulation results verify the correctness and effectiveness of the proposed control strategy.