Research On Mutlti-scale Energy Management Strategy And Systerm Software Design Of Microgrid

The utilization rate of renewable energy can be improved by organically combining the distributed power supply,energy storage and load and connecting the medium and low voltage distribution network in the form of micro grid.The energy management system monitors the operation of the microgrid and manages each unit of the microgrid according to the energy management strategy.This paper takes the grid-connected optical storage microgrid as the research object,establishes the offline and real-time simulation model of the microgrid,focuses on the multi-time-scale energy management strategy of the grid connected microgrid,designs and develops the energy management software,and verifies the main functions of the software.The control mode and operation principle of optical storage microgrid are studied,the Sinmulink model of energy storage unit and photovoltaic unit is built,and the off-line simulation experiment of microgrid is completed in MATLAB environment to verify the correctness of the model and its control strategy.The real-time simulation is carried out to test the timeliness and accuracy of the model.The multi-time scale energy management strategy of microgrid is studied.As the prediction accuracy of renewable energy power generation power increases with the decrease of time scale,in order to reduce the influence of prediction error on energy management strategy,this paper designs a rolling optimal scheduling strategy of "day-ahead+day-ahead+real-time" for micro grid.In the day-ahead optimization dispatching stage,the optimization model is established aiming at the economic operation of the micro-grid,and the pre-dispatching plan of the energy storage device is formulated in combination with the short-term power prediction results of the micro-grid.In the day-ahead rolling scheduling phase,the energy storage charge discharge power is adjusted in time by combining with the ultra-short-term power prediction results of the microgrid,so as to correct the day-ahead scheduling deviation.In the inday real-time dispatching stage,according to the real-time operation data of the micro-grid,the sudden power fluctuation in the micro-grid is limited and adjusted.The rationality of the strategy is verified by an example.Labview-based microgrid energy management system software is designed and developed to realize real-time monitoring,data query,optimal scheduling and other major functions of the microgrid.It is applied to the real-time simulation system of the microgrid,and the performance of the software is tested.Meanwhile,the effectiveness and feasibility of the multi-time-scale energy management strategy are verified.