There are three common grid access methods for distributed photovoltaic power plants, what are the differences between them, and how to choose to maximize the benefits of enterprises.

For the application of distributed photovoltaic power stations, the power grid company allows the owners of photovoltaic power stations to adopt three grid-connected settlement methods: spontaneous self-use, surplus electricity and complete grid connection.

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Spontaneous use

Spontaneous self-use means that the electricity generated by the distributed photovoltaic power station is used by the power generation company itself.

This mode is suitable for manufacturing enterprises that need long-term and long-lasting electricity consumption. The demand on the electricity side is large, and it can completely or most of the electricity generated by the photovoltaic power station. When the power load of the enterprise is less than the power generation capacity of the power station, the surplus power cannot be sent to the grid, which is also its main feature. In order to avoid power reverse transmission, it is necessary to configure an anti-backflow device to give an alarm, and the inverter adjusts the capacity according to the received signal. Of course, when power generation is in short supply, electricity users can also turn to the grid for help. With the advancement of energy storage technology, some companies use energy storage equipment to perform peak and frequency modulation of power to better maximize the utilization of photovoltaic power plants.

To sum up, the advantage of this grid-connected mode is that it is relatively independent, and it has very obvious economic benefits for enterprises with large electricity demand. For areas where power transmission is limited or photovoltaic power generation is not supported for grid connection, this grid-connected mode can also be selected.

Spontaneous self-use, surplus electricity to the grid

Spontaneous self-use and surplus electricity to the grid, as the name suggests, means that the company only uses a part of the electricity generated by the distributed photovoltaic power station, and the remaining electricity is sold to the grid company.

This model is suitable for companies that have a small demand for electricity in production. For this type of enterprise, spontaneous self-use and surplus electricity are the most ideal grid-connected mode. After all, after the enterprise enjoys clean and low-cost green electricity, the remaining part is then sold to the grid company to obtain the corresponding benefits, killing two birds with one stone. But the prerequisite is to reach an agreement with the grid company in advance to set the electricity price based on the company’s power consumption, and the grid company installs a two-way meter to count the power generation of the power station and the power consumption of the company, so as to avoid the situation of information inequity proudce conflict.

Fully grid connection

Full grid connection means that the electricity generated by the distributed photovoltaic power station is directly connected to the grid company, and the electricity used by the enterprise is obtained from the grid.

This grid-connected model is the most mainstream and simplest in the past decade. After all, the subsidies in various places were relatively large before. For enterprises, while enjoying the original electricity price, the additional electricity price benefits of the power station are also very considerable. Nowadays, with the popularization of photovoltaic power plants, subsidies in various regions have been cancelled, and photovoltaic power has also ushered in the era of parity. This model will gradually be weakened under the background of the times, invisibly expanding the space for the transfer of power plants.

Through sharing, I believe everyone has an understanding of the above three grid-connected modes. In the application process, companies need to analyze specific issues in detail, and choose the most suitable method according to the installed scale of photovoltaic power plants, power generation, the company's own electricity consumption, power cycle, local policies, local electricity prices and other related factors.

Posted by Cindy Wong | Findy Solar 

Findy Solar has been a custom solar solution provider and high efficiency solar panel manufacturer in China since 2006. Types of solar panels: crystalline silicon solar panel, back contact solar panel, amorphous silicon solar panel.

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