| With the intensification of the energy crisis,the society needs a new technology to improve the energy situation and realize sustainable development.As a single controllable power supply system,micro grid can reduce the loss of feeder,improve the reliability of local power supply and improve the energy efficiency.As an important part of microgrid,energy management system can ensure the safe operation of the system and improve the system the efficiency of distriduted power.The object of this paper is to study the energy management strategy of photovoltaic microgrid.First of all,the photovoltaic cell equivalent mathematical model of the photovoltaic power generation system is analyzed in detail,the generation principle of photovoltaic cells is illustrated in detail.four kinds of usual energy storage methods are introduced,and the four kinds of storage methods and their advantages and disadvantages are compared,the final choice in hybrid storage lead-acid battery and super capacitor for based on the system.Secondly,the charging and discharging characteristics of lead-acid battery and super capacitor in the hybrid energy storage system are analyzed.The mathematical model and simulation model are built and analyzed.The parallel hybrid energy storage system of lead-acid battery and super capacitor is set up,and the model of the system is described in detail.The simulation model of the hybrid energy storage system is built and simulated.According to the model of hybrid energy storage structure,the bidirectional converter and bi-directional converter are designed,and the control strategies of the two controllers are introduced in detail.In addition,aiming at the DC/AC converter,the PQ control strategy for grid connected operation and the V/f droop control strategy suitable for the islanding operation are designed The Matlab/Simulink simulation is carried out for the whole system,and the running state of the system is analyzed when the light intensity changes.Finally,TMS320F28335 DSP chip produced by TI company as the core to determine the overall scheme of control system,hardware platform,using Code Composer Studio 6 to complete the software design of the system,and using Lab VIEW to program human-computer interface.Above contitutes the composed of photovoltaic power generation energy monitoring system.The use of Access tools to build the database to complete the data storage,convenient view.Finally,the test model is established to verify the correctness and feasibility of the theoretical research. |
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