Small knowledge of household photovoltaic

1. What is photovoltaic power generation?

Photovoltaic power generation refers to the power generation method that uses solar photovoltaic cells to directly convert solar radiation energy into electrical energy. Photovoltaic power generation is the mainstream of solar power generation today.

2. What is a distributed photovoltaic system?

Distributed photovoltaic systems refer to photovoltaic power generation facilities that are built near user sites and are generally connected to power grids with voltage levels below 35kV.

The distributed photovoltaic system operates in two ways: self-use, surplus electricity connected to the grid and full electricity connected to the grid.

Spontaneous self-use and surplus electricity connected to the grid means that the power generated by the distributed photovoltaic power generation system is used first by power users, and the excess electricity is connected to the grid;

Full access to the grid means that all the electricity generated by the distributed photovoltaic power generation system is connected to the grid.

Distributed power generation follows the principles of adapting measures to local conditions, clean and efficient, decentralized layout, and nearby utilization, making full use of local solar energy resources to replace and reduce fossil energy consumption.

3. What is a household distributed photovoltaic system?

The household distributed photovoltaic system refers to the distributed photovoltaic system constructed by using the buildings within the scope of the natural person's homestead, such as self-owned houses and appendages.

Household distributed photovoltaic systems usually have the characteristics of small installation capacity, low voltage level grid connection, and simplified filing and grid connection procedures.

4. What is a distribution network? What is the relationship between distribution network and distributed photovoltaic system?

The distribution network is a power network that receives electric energy from the transmission network or regional power plants, and distributes it locally through power distribution facilities or to various users step by step according to voltage.

The distributed photovoltaic system is connected to the distribution network, so that power generation and consumption coexist in the distribution system. The structure of the distribution network changes from a radial structure to a multi-power source structure, and the magnitude, flow direction and distribution characteristics of the short-circuit current change.

5. Why is it said that photovoltaic power is a green and low-carbon energy?

Photovoltaic power generation has significant energy, environmental and economic benefits, and is one of the highest quality green energy sources.

Under the average sunshine conditions in my country, installing a 1 kW distributed photovoltaic system can generate 1200 kWh of electricity a year, which can reduce the use of coal (standard coal) by about 400 kg and reduce carbon dioxide emissions by about 1 ton.

According to the research results of the World Wildlife Fund (WWF): In terms of the effect of reducing carbon dioxide emissions, installing a photovoltaic power generation system of 1 square meter is equivalent to planting 100 square meters of trees. At present, the development of renewable energy such as photovoltaic power generation will be one of the effective means to fundamentally solve environmental problems such as smog and acid rain.