Shandong Qingzhou Ludong machinery 2.1mw photovoltaic power station project. Color steel tile roof photovoltaic power station, has been connected to the grid successfully!
Conveying mode
Solar photovoltaic power generation is divided into independent photovoltaic power generation, grid connected photovoltaic power generation and distributed photovoltaic power generation
Independent photovoltaic power generation
Independent photovoltaic power generation system is also called off grid photovoltaic power generation system. It is mainly composed of solar cell module, controller and battery. To supply power for AC load, AC inverter is also required.
Grid connected photovoltaic power generation
Grid connected photovoltaic power generation system is that the direct current generated by solar modules is directly connected to the public grid after being converted into the alternating current in line with the requirements of the municipal power grid by the grid connected inverter. Grid connected photovoltaic power generation system has centralized large-scale grid connected photovoltaic power stations, which are generally state-level power stations. The main feature is that the generated energy is directly transmitted to the grid, and the grid is uniformly allocated to supply power to users. However, this kind of power station is characterized by large investment, long construction period, large floor area and relatively difficult development. The decentralized small-scale grid connected photovoltaic system, especially the integrated photovoltaic building power generation system, is the mainstream of grid connected photovoltaic power generation due to its advantages of small investment, fast construction, small floor area and strong policy support.
Distributed photovoltaic power generation
Distributed photovoltaic power generation system, also known as distributed generation or distributed energy supply, refers to the configuration of small photovoltaic power supply system at or near the user site to meet the needs of specific users, support the economic operation of existing distribution network, or meet the requirements of both.
The basic equipment of distributed photovoltaic power generation system includes photovoltaic cell module, photovoltaic array support, DC combiner box, DC distribution cabinet, grid connected inverter, AC distribution cabinet and other equipment. In addition, there are power supply system monitoring device and environmental monitoring device. Its operation mode is that under the condition of solar radiation, the solar cell module array of photovoltaic power generation system will transfer the solar energy to the DC distribution cabinet through the DC combiner box, and the inverter of grid connected inverter will supply the building's own load. The surplus or insufficient power will be adjusted by connecting the grid.
The solar photovoltaic power generation system is composed of solar cell group, solar controller and battery (Group). If the output power is AC 220V or 110V, the inverter shall also be configured. The functions of each part are as follows:
(1) Solar panel: solar panel is the core part of solar power generation system and the most valuable part of solar power generation system. Its function is to convert the radiation capacity of the sun into electrical energy, or send it to the battery for storage, or to promote the work of the load.
(2) Solar controller: the function of solar controller is to control the working state of the whole system, and to protect the battery from overcharge and over discharge. In places with large temperature difference, the qualified controller should also have the function of temperature compensation. Other additional functions such as light control switch and time control switch shall be optional for the controller;
(3) Battery: generally lead-acid battery, small and micro system, can also use nickel hydrogen battery, nickel cadmium battery or lithium battery. Its function is to store the electric energy emitted by solar panels when there is light, and then release it when necessary.
(4) Inverter: the direct output of solar energy is generally 12VDC, 24VDC, 48VDC. In order to supply power to 220VAC electrical appliances, it is necessary to convert the DC power generated by solar power generation system into AC power, so DC-AC inverter is needed.