What is energy storage?

 

Energy storage mainly refers to the storage of electrical energy. Energy storage is a term in petroleum reservoirs and represents the ability of reservoirs to store oil and gas. Energy storage itself is not an emerging technology, but it has just emerged from an industrial perspective and is in its infancy.

 

So far, China has not reached the level that the United States and Japan regard storage energy as an independent industry and introduce special support policies. Especially in the absence of a mechanism for energy storage, the commercialization model of the energy storage industry has not yet formed. .

 

 

What is photovoltaic?

 

Photovoltaic: short for solar power system, a new type of power generation system that uses the photovoltaic effect of solar cell semiconductor materials to directly convert solar radiation energy into electrical energy, with independent operation and There are two ways to run on the grid.

 

At the same time, solar photovoltaic power generation system classification, one is centralized, such as large-scale northwest terrestrial photovoltaic power generation system; one is distributed (with >6MW as the boundary), such as industrial and commercial enterprise roof photovoltaic power generation system, residential roof photovoltaic power generation system.

 

 

What is distributed photovoltaic?

 

Distributed photovoltaic power generation refers to a photovoltaic power generation facility that is built near the user's site and operates in a self-contained mode on the user's side, with excess power on the Internet, and balanced in the distribution system. Distributed photovoltaic power generation follows the principles of local conditions, clean and efficient, distributed layout, and close utilization, making full use of local solar energy resources to replace and reduce fossil energy consumption.

 

Distributed photovoltaic power generation refers to a distributed generation system that uses photovoltaic modules to directly convert solar energy into electrical energy. It is a new type of comprehensive utilization of power generation and energy with broad development prospects. It advocates the near power generation, the nearest grid connection, the near conversion, and the principle of near use, which can not only effectively increase the power generation of photovoltaic power plants of the same scale, but also It effectively solves the problem of power loss in boosting and long-distance transportation.

 

The most widely used distributed photovoltaic power generation system is the photovoltaic power generation project built on the roof of urban buildings. Such projects must be connected to the public grid to provide power to nearby users along with the public grid.

 

 

What is a photovoltaic system?

 

Photovoltaic power generation systems can be divided into grid-connected photovoltaic power generation systems and stand-alone photovoltaic power generation systems depending on whether they are connected to the grid. Grid-connected photovoltaic power generation system mainly refers to photovoltaic systems that are connected to the grid and are subject to grid dispatching, such as various centralized or distributed photovoltaic power plants. The independent photovoltaic power generation system mainly refers to various photovoltaic power generation systems that are independent of the power grid operation, such as solar street lamps and rural household photovoltaic power sources, which are collectively referred to as photovoltaic systems.

 

What is photovoltaic + energy storage?

 

The combination of photovoltaics and batteries as energy storage devices is photovoltaic + energy storage.

 

 

What are the benefits of photovoltaic + energy storage?

 

Grid-connected PV energy storage system: The electricity generated by PV can be used during the day and night. The distributed general metering is used during the day and the grid power is still used at night. In addition to the energy storage, the energy storage system can be discharged at night. The grid-connected photovoltaic power generation system is directly connected to the distribution network, and the electric energy is directly input into the power grid. Currently, there is no energy storage system, and the phenomenon of photovoltaic “disposal of light and power limitation” is serious, and the fluctuation of power output of the photovoltaic power generation system is large. After the restrictions on the utilization and promotion of renewable energy are becoming more and more serious, the allocation of energy storage in grid-connected photovoltaic systems has become one of the current directions for large-scale energy storage systems.

 

The output of electric power is smoother: photovoltaic power generation is a process in which solar energy is converted into electric energy, and its output power is drastically changed by environmental factors such as solar radiation intensity and temperature. In addition, since the photovoltaic power output is a direct current, it needs to be converted into an alternating current by an inverter. After the power is connected to the grid, harmonics are generated during the inverter process. The instability of photovoltaic power and the presence of harmonics make the access of photovoltaic power impact on the grid. Therefore, an important purpose of energy storage in grid-connected photovoltaic power generation systems is to smooth photovoltaic power output and improve photovoltaic power quality.

 

Stand-alone photovoltaic energy storage system: A stand-alone photovoltaic system is a photovoltaic system that operates independently of a grid-connected photovoltaic system. At present, the widely used independent systems such as solar street lamps, solar mobile power sources, etc., their photovoltaic power generation output and load power consumption are not in the same period of time, as long as there are no restrictions on the installation location of the sun.

 

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