I would like to ask a question, how many grid connected modes are there for photovoltaic power gener

There are three grid-connected modes for distributed photovoltaic power generation projects:

1) All self-use: all the electricity generated by photovoltaic equipment is self-use, and it is not connected to the grid;

2) Self-generation and self-consumption, surplus electricity on the grid: part of the electricity generated by photovoltaic equipment is used for self-use, and the remaining electricity is connected to the grid;

3) Full grid: all the electricity generated by photovoltaic equipment is connected to the grid.

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Access conditions (smart grid, transmission line construction), policies (national, local, industry policies) and other aspects are not to be discussed, briefly talk about the problems of the photovoltaic system itself:

1. Improve the conversion efficiency of components. In the same case, improving the efficiency of components can save land resources and reduce the cost of equipment such as brackets, cables, and combiner boxes. (It can reduce investment costs).

2. Improve the quality of components to the consistency of performance. At present, the grid-connected power stations are all MW-level, and the total quality defects and consistency losses of ordinary modules exceed 5%; (It can improve the efficiency of power generation).

3. Improve the trouble-free operation time of the system. This is primarily determined by the quality of the core components, followed by the system design technology, and then the environmental conditions of the site. (Reduced operation and maintenance costs).

4. Reduce the loss of components, in addition to components, the photovoltaic grid-connected system is also composed of combiner boxes, DC distribution cabinets, inverters, step-up transformers, AC and DC transmission lines, etc., which will produce a certain loss every time it is converted and transmitted.

Rational selection of components can reduce costs and improve system efficiency).

5. Monitoring and communication problems. The communication formats and protocols adopted by the power grid dispatching platform and various equipment manufacturers are different, and there is no unified standard. Just like a mobile phone charger, when buying a mobile phone, you must match the corresponding mobile phone charger, and there is no right to choose.

The power system is an equation of power balance, and it is an equation that keeps balance at any time, that is, electricity consumption is equal to power generation, if the photovoltaic does not generate electricity, because it is connected to the main grid, if there is no power generation side without any electrical equipment used, then the grid-connected line has no power, if there is electrical equipment used, then the power will be sent from the high voltage.

When there is no power supply on the low-voltage side and the high-voltage power is cut off, then the transformer is out of the power supply and there is nothing on the transformer. When there is power on the low-voltage side and the power is cut off on the high-voltage side (the high-voltage switch is disconnected), then there will be a high-voltage voltage on the high-voltage side of the transformer, but there is no current because there is no load on the high-voltage side (high-voltage side open).

There are 2 forms of photovoltaic power generation system connected to the grid:

Centralized and decentralized grid connection.

Centralized grid connection: the characteristic is that the generated energy is directly transmitted to the large power grid, which is uniformly allocated by the large power grid to supply power to users, and the power exchange between the large power grid is one-way. It is suitable for large-scale photovoltaic power stations to be connected to the grid, usually far away from the load point, and desert photovoltaic power stations are connected to the grid in this way.

Distributed grid connection: also known as distributed photovoltaic power generation grid connection, the characteristics are that the generated electric energy is directly distributed to the electricity load, and the excess or insufficient power is regulated by connecting the large power grid, and the power exchange between the large power grid may be two-way. It is suitable for small-scale photovoltaic power generation systems, which are usually used in urban photovoltaic power generation systems, especially for photovoltaic systems that are combined with buildings.

1MWh generatedCarbon emissionsApproximately equal to 1 ton of CO2. It can be divided into an independent power generation system with a battery and a grid-connected power generation system without a battery. Solar power generation is divided into solar thermal power generation and photovoltaic power generation.

At present, the commercialization of solar power refers to the photovoltaic power generation of the Sun Shidong Cave Energy. A photovoltaic power generation system that is connected to and delivers electricity to the grid.

Photovoltaic power station is the most vigorous green power development energy project encouraged by the state.

Photovoltaic power generation products are mainly used in three aspects:

One is to provide power for non-electric occasions;

the second is solar daily electricity old and withered products, such as all kinds of solar chargers, solar street lamps and solar grass lamps;

The third is grid-connected power generation, which is in developed countries.

It has been widely promoted and implemented. By 2009, China's grid-connected power generation had not yet begun to be fully promoted, but the 2008 Beijing Olympics.

Part of the electricity is provided by solar power and wind power.

According to the current policy and business rules, distributed photovoltaic power generation.

There are three grid-connected modes of the project:

1) All self-use: all the electricity generated by photovoltaic equipment is self-use, and it is not connected to the grid;

2) Self-generation and self-consumption, surplus electricity on the grid: part of the electricity generated by photovoltaic equipment is used for self-use, and the remaining electricity is connected to the grid;

3) Full grid: all the electricity generated by photovoltaic equipment is connected to the grid.

Hope we are helpful to you.

There are three grid-connected modes for distributed photovoltaic power generation projects:

1) All self-use: all the electricity generated by photovoltaic equipment is self-use, and it is not connected to the grid;

2) Self-generation and self-consumption, surplus electricity on the grid: part of the electricity generated by photovoltaic equipment is used for self-use, and the remaining electricity is connected to the grid;

3) Full grid: all the electricity generated by photovoltaic equipment is connected to the grid.

The first distributed photovoltaic power generation is about 10,000-20,000 yuan per unit, which is a few thousand yuan cheaper and tens of thousands of yuan more expensive. The first distributed photovoltaic power generation is affected by many aspects such as brand, category, specification, market, etc., and it is necessary to understand and compare many aspects before choosing to buy. Distributed photovoltaic power generation refers to the photovoltaic power generation facilities built near the user's site, and its operation mode is characterized by self-consumption on the user side, excess electricity on the grid, and balanced regulation of the power distribution system.

Distributed photovoltaic power generation follows the principles of adapting measures to local conditions, clean and efficient, decentralized layout, and nearby utilization, and makes full use of local solar energy resources to replace and reduce fossil energy consumption. Distributed photovoltaic power generation refers to a distributed power generation system that uses photovoltaic modules to directly convert solar energy into electrical energy. It is a new type of power generation and energy comprehensive utilization, which has broad development prospects.

Advocate the principle of nearby power generation, nearby grid connection, nearby conversion, and nearby use. It can not only effectively increase the power generation of photovoltaic power stations of the same scale, but also effectively solve the problem of power loss in boosting and long-distance transportation. At present, the widely used distributed photovoltaic power generation system is a photovoltaic power generation project built on the roof of an urban building.

Such projects must be connected to the public grid and, together with the public grid, supply electricity to nearby users.

Spontaneous self-use surplus electricity to the Internet, full Internet access, all self-consumption. Three modes.

For distributed photovoltaic power generation applications, the State Grid allows photovoltaic power station owners to adopt three settlement modes: self-generation and self-consumption mode, self-generation and self-consumption surplus electricity on-grid or complete on-grid operation.

Generally, it is the grid of the connected power station, and the electricity is sold to the power station and then made a profit.

According to the policies and business rules before the trembling, there are three grid-connected modes for distributed photovoltaic power generation projects:

1) All self-use: all the electricity generated by photovoltaic equipment is self-use, and it is not connected to the grid;

2) Self-generation and self-consumption, surplus electricity on the grid: part of the electricity generated by photovoltaic equipment is used for self-use, and the remaining electricity is connected to the grid;

3) Full access to the Internet: All the electricity generated by photovoltaic equipment is connected to the grid.

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Or two, the first spontaneous self-use surplus electricity grid-connected mode, the second full grid-connected mode, how to choose between the two, it depends on the electricity price you use is the civil electricity price or the electricity price of more than 1 yuan for industrial electricity, if it is a civil electricity price, in fact, you can choose the full amount of the Internet, if it is an industrial electricity price, then obviously the first contains a kind of spontaneous self-use, the surplus electricity talks about the Internet guessing mode is more suitable.

According to the current policy and business rules, there are three grid-connected modes for distributed photovoltaic power generation projects:

1. All self-use: the electricity generated by photovoltaic equipment is all used by the spine of Xiangzhao, and is not connected to the grid;

2. Spontaneous self-use, surplus electricity on the grid: the amount of electricity generated by photovoltaic equipment is guessed, part of the electricity is used for self-use, and the remaining electricity is connected to the grid;

3) Full grid: all the electricity generated by photovoltaic equipment is connected to the grid.

Hope we are helpful to you.

According to the current policy and business rules, there are three grid-connected modes for distributed photovoltaic power generation projects:

1. All self-use: the electricity generated by photovoltaic equipment is all used by the spine of Xiangzhao, and is not connected to the grid;

2. Spontaneous self-use, surplus electricity on the grid: the amount of electricity generated by photovoltaic equipment is guessed, part of the electricity is used for self-use, and the remaining electricity is connected to the grid;

3) Full grid: all the electricity generated by photovoltaic equipment is connected to the grid.

Hope we are helpful to you.

According to the current policies and business rules, there are three grid-connected modes for distributed photovoltaic power generation projects:

1) All self-use: all the electricity generated by photovoltaic equipment is self-use, and it is not connected to the grid;

2) Self-generation and self-consumption, surplus electricity on the grid: part of the electricity generated by photovoltaic equipment is used for self-use, and the remaining electricity is connected to the grid;

3) Full grid: all the electricity generated by photovoltaic equipment is connected to the grid.

We hope you find ours helpful.