On-grid and off-grid operation mode of solar photovoltaic power generation system

With the attention of environmental protection and renewable energy, solar photovoltaic power generation system as a green and clean energy solution has attracted much attention. In the solar photovoltaic power generation system, its on-grid and off-grid operation mode is of great significance.

On-grid operation mode In the grid-connected operation mode of the solar photovoltaic power generation system, the power generation system is connected to the power system, and the electricity generated by the photovoltaic power generation system can be fed into the power grid to supply users.

The on-grid operation mode has the following characteristics:

1. Two-way power transmission: in the grid-connected operation mode, the photovoltaic power generation system can achieve two-way power transmission, that is, the system can obtain electricity from the power grid, and can also feedback excess power to the power grid. This two-way transmission characteristic makes the photovoltaic power generation system not only provide users with a stable and reliable power supply, but also transmit excess electrical energy to the grid, reducing energy waste.

2. Automatic adjustment: The photovoltaic power generation system can automatically adjust its output power according to the current and voltage level of the power network in the grid-connected operation mode to maintain the stable operation of the system. This automatic adjustment function can effectively improve the power generation efficiency of the photovoltaic system, while ensuring the safety and stability of the power network.

3. Backup power supply: the photovoltaic power generation system in grid-connected operation mode can be used as a backup power supply. When the power network fails or there is a power failure, the system can automatically switch to the standby power supply state to provide users with a stable power supply. This enables the photovoltaic power generation system in grid-connected operation mode to provide reliable power protection when the power network fails.

The off-grid operation mode corresponds to the off-grid operation mode, and the solar photovoltaic power generation system is not connected to the power grid in the off-grid operation mode, and the system can operate independently and provide power supply to users.

The characteristics of off-grid operation mode are as follows:

1. Independent power supply: The photovoltaic power generation system in off-grid operation mode does not rely on any external power network, and can independently provide power supply to users. This feature of independent power supply makes photovoltaic power generation systems have important application value in remote areas or places where there is no access to the power grid.

2. Energy storage system: In order to ensure that the photovoltaic power generation system in off-grid operation mode can supply power to users all day long, the system is usually equipped with energy storage equipment, such as battery packs. The energy storage device can store the electricity generated by the photovoltaic power generation system during the day and provide power supply to users at night or under low light conditions.

3. Energy management: the photovoltaic power generation system in off-grid operation mode usually has an intelligent energy management system, which can real-time monitor the power generation status of the system, the electricity demand of the user and the charging and discharging status of the energy storage equipment to achieve the best energy utilization and distribution.

The grid-connected and off-grid operation modes of solar photovoltaic power generation systems have their own advantages, and suitable operation modes can be selected for different application scenarios and needs. In China, with the continuous development of solar photovoltaic power generation technology and policy support, solar photovoltaic power generation system will have broad application prospects in the future.