With the distributed photovoltaic into millions of households, people's demand for photovoltaic is also varied, and the grid-connected system of spontaneous self-consumption of photovoltaic power generation is not a single form, according to the needs of different occasions, the solar photovoltaic power generation system can be divided For grid-connected power generation system, off-grid power generation system, and off-grid energy storage system, energy storage system and optical storage micro-grid system three.
1, grid-connected power generation system
The PV grid-connected system consists of components, brackets, grid-connected inverters and grid-connected cabinets. The DC power generated by the solar panels is converted into AC power by the inverter and sent to the grid. At present, there are mainly three types of large-scale ground stations, medium-sized commercial power stations and small domestic power stations.
As the grid photovoltaic power generation system does not require the use of batteries, saving costs. The new national grid release policy has made it clear that household photovoltaic power plants can access the network for free and that extra power can be sold to power companies. From the long-term investment perspective, according to the calculation of the life span of a 25-year domestic PV power plant, the cost can be recovered in about 6-10 years and the remaining 10 years is earned.
However, the grid has its drawback, that is, when the public grid power, photovoltaic power generation can not run. But if one of the grid-connected inverter into energy inverter, the power station can be normal operation.
2, off-grid power generation system
Off-grid photovoltaic power generation system, independent of the grid and run independently, is widely used in remote mountainous areas, non-electric areas, islands, communications base stations and street lighting and other applications. System generally consists of solar modules composed of photovoltaic square, solar controller, inverter, battery, load and other components. Solar photovoltaic square in the case of solar energy will be converted to electrical energy through the solar inverter control one machine to the load power supply, while charging the battery pack; in the absence of light, from the battery through the inverter to the AC load power supply.
This system takes 30-50% of the cost of the power generation system due to the battery must be equipped. And the life of lead-acid batteries are generally 3-5 years later, they have to be replaced, which is an increase of the cost of use. Economically, it is difficult to get a wide range of promotion and use, it is not suitable for the convenience of electricity use.
Off-grid system has strong practicability for families in non-grid areas or areas with frequent outages. Especially in order to solve the lighting problem of power failure, DC energy-saving lamps can be used, which is very practical. Therefore, off-grid power generation system is specifically for non-grid areas or places often used in power outages.
3, and off-grid energy storage system
And from the grid-type photovoltaic power generation system is widely used in frequent power outages, or photovoltaic self-use can not be the Internet, self-consumption price is much more expensive than the price of the Internet, peak price is much more expensive than the wave of electricity and other applications. The system consists of a photovoltaic array of solar modules, solar energy and off-grid one machine, battery pack, load and other components. Solar photovoltaic square in the case of solar energy will be converted to electrical energy through the solar control inverter machine to the load power supply, while charging the battery pack; in the absence of light, by the battery to the solar control inverter power supply, give AC load power supply.
Exploring the Development Space of Photovoltaic Power Plants during the Thirteenth Five-year Plan
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