| With the problem of the energy crisis and the environmental pollution becoming more and more serious,it is urged to find a clean new energy to solve the current problem.And the advantages of solar power has been recognized by people.The development of science and technology,the application of DC load is increasing,having influenced on power supply mode and promoting the development of DC micro-grid.The structure of DC micro-grid includes power generation module,energy storage module and load module.In order to achieve the coordinated control of energy and the security and stability of power supply,it needs to adopt proper strategy.The object of this paper gives detailed analysis of master-slave DC micro-grid system including solar array,battery and controllable load.Firstly,the characteristics of model of solar cells,energy storage module and converter are analyzed.We make a detailed study of maximum power point tracking methods of solar energy and the control method of energy storage module,which lays a foundation for the further study of DC micro-grid.Secondly,the parallel problem of multiple converter is analyzed.Finally,for the whole of DC micro-grid system,we have proposed a new hierarchical control strategy and set a corresponding simulation model of DC micro-grid in the Matlab/Simulink environment.And the control strategy is validated through simulation. |
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