According to the needs of different application scenarios, photovoltaic power generation systems can be divided into five types: photovoltaic grid-connected systems, photovoltaic grid-connected energy storage systems, photovoltaic off-grid energy storage systems, off-grid energy storage systems and photovoltaic storage microgrid systems.

NO.1---Photovoltaic grid-connected system

Main components: solar modules, grid-connected inverter, load and grid.Working logic: The DC power generated by the solar panel is converted into AC power by the inverter and sent to the grid.

Application scenarios: large ground power stations, medium-sized industrial and commercial power stations, small household power stations, etc.

Advantages: There is no need to use batteries, which saves costs; from an investment perspective, excess electricity can be sold to power companies to obtain profits.

NO.2--Photovoltaic grid-connected energy storage system

Main components: solar modules, batteries, grid-connected energy storage inverters, loads and grid.

Working logic: When the solar power is greater than the load power, part of the solar energy is converted into alternating current through the inverter to supply power to the load, and the remaining inverter will store the electric energy in the battery; when the solar power cannot meet the load needs, the inverter The electric energy stored in the battery is converted to supply the load to ensure the continuity and stability of the entire system.

Application scenarios: It is used in applications where photovoltaic self-consumption cannot be connected to the Internet, the price of self-consumption electricity is higher than the price of grid-connected electricity, and the peak electricity price is more expensive than the flat electricity price.

Advantages: When the light is strong during the day and the power consumption is not high, excess power generation can be stored to increase the proportion of self-use.

NO.3--Photovoltaic off-grid energy storage system

Main components: solar modules, off-grid inverter, battery, load and power grid.

Working logic: It operates independently without relying on the power grid. When there is light, it converts DC power into household AC power, supplies power to the load, and charges the battery pack at the same time; when there is no light, the battery supplies power to the AC load through the inverter.

Application scenarios: It is widely used in remote mountainous areas, areas without power, islands, communication base stations, street lights and other application places. It is mainly used in areas without power grid or areas with frequent power outages.

Advantages: It is not restricted by geography, does not rely on the power grid, and has a wide range of uses. Photovoltaic off-grid energy storage systems can be installed and used wherever there is sunshine.

NO.4--Photovoltaic and off-grid energy storage system

Main components: solar components, off-grid inverter, battery, off-grid load, grid-connected load and power grid.

Working logic: The photovoltaic array converts solar energy into electrical energy when there is light, supplies power to the load through the all-in-one machine, and charges the battery pack at the same time. When there is no light, the battery supplies power to the solar control inverter all-in-one machine, and then to the AC load power supply. When the power grid fails, it switches to the off-grid state and supplies power to important loads through the backup mode. When the power grid recovers, it switches back to grid-connected work.

Application scenarios: It is mainly suitable for applications where the power grid is unstable and has important loads, or where the self-consumption of photovoltaic power cannot be left on the Internet, the price of self-consumption electricity is much more expensive than the grid electricity price, and the peak electricity price is much more expensive than the flat electricity price.

Advantages: Batteries can be used to store the electricity converted by photovoltaic arrays to increase the proportion of self-use. The batteries can also be charged during off-peak periods and used during peak electricity consumption periods to reduce electricity bills. The most important thing is that when the power grid is outage, it can be converted to electricity. For off-grid operation, use as backup power source.

NO.5--Photovoltaic microgrid energy storage system

Main components: solar modules, batteries, integrated photovoltaic and storage machines, off-grid loads, grid-connected loads and grid.

Working logic: It can be operated in parallel with the external power grid or in isolation. The photovoltaic array converts solar energy into electrical energy when there is light, supplies power to the load through the inverter, and charges the battery bank through the PCS energy storage converter; when there is no light, the battery passes through the PCS energy storage converter. Supply power to the load.

Application scenario: It is suitable for establishing small and medium-sized distributed power sources in islands and remote mountainous areas where many people live.

Advantages: Including all applications of off-grid systems and grid-connected systems, with multiple working modes, maximizing the use of photovoltaic energy and reducing the user's dependence on the power grid. It can fully and effectively unleash the potential of distributed clean energy, reduce unfavorable factors such as unstable power generation and low reliability of independent power supply, and ensure the safe operation of the power grid. The microgrid system can promote the upgrading of traditional industries. From an economic and environmental perspective, it can play a role Huge effect.