Photovoltaic power generation is the process of converting solar energy into electrical energy. The output power of this process is greatly affected by environmental factors such as solar radiation intensity and temperature. Moreover, since the output of photovoltaic power is direct current, it needs to be converted into alternating current through an inverter before being connected to the power grid. During the conversion process, harmonics are generated. The instability of photovoltaic power output and the presence of harmonics will cause an impact on the power grid when photovoltaic power is connected. Therefore, one of the important purposes of configuring energy storage in grid-connected photovoltaic power generation systems is to smooth the output of photovoltaic power and improve the quality of photovoltaic power.

The advantages of the photovoltaic power generation and energy storage system mainly include the following points:

Clean energy: Photovoltaic power generation does not produce greenhouse gas emissions and is beneficial to environmental protection. 

Renewable Energy: Solar energy is unlimited and will never run out.

Cost reduction: With technological advancements, the cost of photovoltaic power generation has been decreasing year by year, and its economic efficiency has improved. 

Distributed generation: Can be installed on rooftops or open spaces, reducing transmission losses by .

Power regulation: Balancing supply and demand, enhancing grid stability .

Peak-valley shaving: Store energy when the electricity price is low and release it when the price is high, thereby reducing electricity costs by .

Emergency backup: Provides emergency power support in case of grid failure .

Enhancing self-sufficiency: For remote areas, energy storage systems can increase the self-sufficiency of electricity by .

Optimize energy output and utilization: Smooth out the output of photovoltaic power generation and increase the self-sufficiency rate of energy. 

Economic benefits are remarkable: reducing electricity costs and coping with the sharp increase in electricity usage. 

Enhance grid stability and reliability: Balance supply and demand, and provide backup power sources .

Promote the optimization of the energy structure and sustainable development: Support the grid connection of renewable energy, and promote the development of green energy .