Simulink simulation of power coordination control for photovoltaic DC microgrids 

① Grid connection mode: Photovoltaic Boost adopts disturbance observation method for maximum power point tracking, while energy storage bidirectional BuckeBoost adopts DC bus voltage outer loop current inner loop, with a maximum photovoltaic power of 20kw and a bus voltage of 700V, which can be set by oneself.
② Off grid mode: both photovoltaic and energy storage are switched to droop control mode, refer to Section 3.2 of Chapter 3 for control setup
Simulation results:
Normal grid connection mode: The photovoltaic system maintains its maximum power output unchanged. After 1 second, the load is switched on and off, and the load increases. At this time, in order to stabilize the system, energy storage discharge compensation power is used.
In off grid mode, both photovoltaic and energy storage devices adopt droop control. When the load increases, both photovoltaic and energy storage devices increase power output due to droop control
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