Grid-connected photovoltaic systems
Release time: 2024-09-19
Grid-connected photovoltaic power generation systems can convert the direct current output from solar arrays into alternating current (AC) of the same amplitude, frequency and phase as the grid voltage, and enable connection to the grid and delivery of power to the grid. The flexibility of this type of power generation system lies in the fact that when sunlight is strong, the photovoltaic power generation system feeds excess power into the grid while supplying power to the AC loads; and when sunlight is insufficient, i.e., the solar arrays are not able to provide sufficient power to the loads, power can be drawn from the grid to supply the loads.
A solar photovoltaic power generation system connected to the public power grid is called a grid-connected photovoltaic power generation system, which includes solar arrays, DC/DC converters, DC/AC inverters, AC loads, transformers and other components. The grid-connected photovoltaic power generation system can convert the DC power output from the solar cell array into AC power of the same amplitude, frequency, and phase as the grid voltage, and realise the connection with the grid and delivery of power to the grid. The flexibility of this type of power generation system lies in the fact that when sunlight is strong, the PV power generation system supplies power to the AC loads while feeding the excess power into the grid; and when sunlight is insufficient, i.e., the solar arrays do not provide enough power to the loads, the power can be drawn from the grid to supply the loads with power. In the past, due to the high cost of solar cells, photovoltaic power generation is mostly used in some special independent operation of the system, such as aerospace, border islands or remote areas of the demonstration project. With the emergence of new photovoltaic materials, product prices continue to decline, the conversion efficiency has been continuously improved, advanced power electronics, microprocessors, as well as the introduction of advanced control strategies, have made the study of photovoltaic grid-connected technology and a large number of promotional increasingly possible, the use of photovoltaic also gradually to the city of grid-connected photovoltaic power plants, photovoltaic buildings in the community integrated and low-power household photovoltaic grid-connected systems in the direction of the development of the system.
Key words:
Grid-connected photovoltaic
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