Distributed photovoltaic power stations usually refer to power generation systems that use distributed resources, have small installed capacity and are arranged near users. They are generally connected to power grids with voltage levels lower than 35 kV or lower. Distributed photovoltaic power station refers to a distributed photovoltaic power station system that uses photovoltaic modules to directly convert solar energy into electrical energy.
The most widely used distributed photovoltaic power station system is a photovoltaic power generation project built on the roof of urban buildings. Such projects must be connected to the public grid to supply power to nearby users together with the public grid. Without the support of public power grid, the distributed system cannot guarantee the reliability and quality of power consumption of users.
Features of distributed photovoltaic power stations:
1. The output power is relatively small. The traditional centralized power station is often hundreds of thousands of kilowatts, or even millions of kilowatts. The large-scale application has improved its economy. The modular design of photovoltaic power generation determines whether its scale can be large or small, and the capacity of photovoltaic system can be adjusted according to the requirements of the site. Generally speaking, the capacity of a distributed photovoltaic power station project is within several thousand kilowatts. Different from centralized power stations, the size of photovoltaic power stations has little impact on power generation efficiency, so it has little impact on its economy. The return on investment of small photovoltaic systems is not lower than that of large ones.
2. Small pollution and outstanding environmental benefits. During the power generation process of the distributed photovoltaic power station project, there is no noise and no pollution to the air and water. However, attention should be paid to the coordinated development of distributed photovoltaic and the surrounding urban environment. When using clean energy, people’s concerns about the beauty of the urban environment should be considered.
3. To some extent, it can alleviate the local power shortage. Distributed photovoltaic power stations have the highest output in the daytime, which is exactly the time when people have the greatest demand for electricity. However, the energy density of distributed photovoltaic power stations is relatively low. The power of the distributed photovoltaic power station system is only about 100 watts per square meter. In addition, the roof area of buildings suitable for installing photovoltaic modules is limited. Therefore, distributed photovoltaic power stations cannot fundamentally solve the problem of power shortage.