1. Problem description:
Before designing photovoltaic grid-connected, it is first necessary to design a simulation model of photovoltaic cells.
The equivalent circuit of photovoltaic power supply is as follows:
Then obviously there are:
Through simple verification, the circuit diagram provided in the paper has certain problems. For this reason, the structure needs to be simplified and redesigned. However, the final design idea is still the basic circuit diagram of the photovoltaic power supply in the paper.
Here, the basic structure of its photovoltaic grid connection is as follows:
The main design ideas are as follows:
The 
design is mainly based on the formula .
Enlarging the above principle block diagram, you can see the following effects:
Through the above figure, you can see that it was obtained from the formula in the paper at the beginning.
2. Part of the program:
3. Simulation conclusion:
A-0002-007