Research on the operation control strategy for the DC micro-grid based on the DCT equivalent model

With the development of power electronic technology, the DC Micro-grid has been paid more and more attention with its powerful energy saving advantages. In this paper, taking the DC Micro-grid composed of photovoltaic generation, energy storage device, DC transformer and load as the research object. Considering three operation modes of grid-connected operation, isolated island operation and smooth switch, the operating modes of the system is designed, the control strategies of the Micro-grid is studied. The DC transformer equivalent model is given to solve the problems about the long simulation step, numbers of computing nodes, lower simulation efficiency. Finally, the simulation platform is built to verify the effectiveness of the system, the feasible of the DC transformer equivalent model.