Low energy density is weakness of solar photovoltaic power plant

Photovoltaic energy density low, not photovoltaic components, but the sun to the earth energy density is very low, because the light is calculated according to the area, and photovoltaic energy density also can be calculated per unit area. A bolt of

photovoltaic low energy density is not photovoltaic components, but the energy density is very low when sunlight hits the ground. Because receives the light is calculated according to the area, so the energy density of the photovoltaic power generation is also calculated according to the per unit area. On a sunny noon, every square metre sunshine illuminate the total energy of about 1 kw. If the photovoltaic conversion efficiency calculation is 20%, then the pv modules to 200 watts per square metre. Photovoltaic energy density is low, the energy density distribution of the most power users and is the same. Therefore, it should be said that in addition to those who need the large volume of traditional fossil energy power plant, for the majority of residents, villages and towns, and the power supply of agricultural production and field facilities, photovoltaic power generation is more suitable for meet the needs of power users of energy density. To be sure, along with the application of new energy sources such as photovoltaics, DC power grid is likely to rise again, and have the upper hand in family and office. However, this is definitely not backward, but progress and has risen in a spiral. First of all, the power source is entirely green energy, no noise and pollution. Secondly, DC and ac transformation is through the power electronic equipment, do not need generator and rectifier. Different new energy and local load constitute a micro grid, an ac/dc hybrid power grid will gradually appear. In addition, modern photovoltaic (pv) is different from the central station. Edison's center is still a radioactive structure, little power to more power, and the current of the photovoltaic power generation is more power to each roof more electricity. Therefore, the power transmission distance is very short. In the future, for those who use less electricity field, facilities and buildings, new energy can supply power in the form of a micro grid. You can call it 'distributed generation', but this is not a strict term. 'Grid' is a more scientific terms. All kinds of new energy sources to provide local electricity power load, power supply and load of micro grid. The network load increases and the increase of the power supply can be perfectly synchronized, there is no capacity limits. Because the new house must have a new roof. Then, a large number of micro power grid will be connected through the intelligent technology, and those users can still use a large load capacity of the existing power grid system for transmission and distribution. Micro network and the backbone network integration, network covering the whole area, the national and global energy to the Internet. In after the birth of a large number of micro grid, everyone will realize, photovoltaic power generation of low energy density is not necessarily a bad thing, but may be god have done for us a good and wonderful arrangement.