How is photovoltaic power generation integrated into the grid?

Simply put, the DC power of the photovoltaic cell is connected to the DC/AC inverter system after being stabilized by DC/DC, converted into three-phase power with the same frequency and the same amplitude as the power grid, and integrated into the power grid. Considering the cost of the DC voltage regulator circuit, the Boost boost chopper circuit is generally used, the inverter uses an IGBT three-phase full-bridge inverter circuit, and the PWM modulation technology is used for system control.
Since the power electronic technology mainly controls the switching tube to realize the system operation, certain fluctuations will inevitably occur, which is unavoidable, but this impact can be minimized, such as:
1) Optimize hardware circuit design
2) Reasonable device selection (especially the filtering effect of filter capacitors and smoothing reactors)
3) Accuracy calibration of sampling in the control program, adjustment of PI parameters
4) In general, the higher the frequency of PWM modulation, the harmonics can be reduced to a certain extent.
The above is mainly for some contents of the inverter system, and there are other related anti-disturbance methods on the grid side.