| With the development of new energy industry in China,the development of energy storage technology and industry is attracting more and more attention.At present,the research of energy storage technology in China is mainly used in distributed photovoltaic power generation,wind power generation system,energy storage converter as an important part of energy storage system.It plays an interface between photovoltaic battery board,wind generator and power grid,and realizes the two-way exchange of energy.The microgrid can not only run from the net,but also operate in parallel.It provides reliable and stable power for local load.The control technology of energy storage bi-directional converter is one of the key technologies of microgrid.The main work of this paper includes the following points:(1)The development trend of energy storage bidirectional converter is introduced,and several control strategies of microgrid and energy storage bi directional converter are introduced;(2)The voltage type three-phase bridge inverter is selected as the topology of the energy storage bi-directional converter,and its mathematical model is established.At the same time,the design of the controller and the principle of SPWM are analyzed;(3)Comparative analysis of three methods of microgrid PQ control,VF control and droop control,and three PLL technologies are carried out and verified by simulation;(4)A hardware experimental platform based on TMS32028335 was built to verify the bidirectional converter's off grid operation and grid connected operation,and achieved the desired results. |
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