Optical storage information

‍ What is energy storage? ‍

Energy storage mainly refers to the storage of electrical energy. Energy storage is a term in petroleum reservoir, which represents the ability of reservoir to store oil and gas. Energy storage itself is not a new technology, but it is in its infancy in terms of the industry.

So far, China has not reached the extent that the United States and Japan regard energy storage as an independent industry and issue special support policies. In particular, in the absence of a payment mechanism for energy storage, the commercialization model of the energy storage industry has not yet taken shape.

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What is photovoltaic?

Photovoltaic (Photovoltaic) : short for Solar power system. It is a new power generation system that directly converts the Solar radiation energy into electric energy by using the Photovoltaic effect of the semiconductor material of the Solar cell. It has two modes of independent operation and grid-connected operation.

At the same time, solar photovoltaic power generation system classification, one is centralized, such as the large northwest ground photovoltaic power generation system; One is distributed (with >6MW as the boundary), such as the rooftop PHOTOVOLTAIC power generation system of industrial and commercial enterprises and residential buildings.

What is distributed pv?

Distributed PHOTOVOLTAIC power generation refers to the photovoltaic power generation facilities built near the user site, which are characterized by self-use on the user side, Internet access of excess power, and balance adjustment in the distribution system. Distributed photovoltaic power generation follows the principles of adapting measures to local conditions, clean and efficient, decentralized distribution and nearby utilization, making full use of local solar energy resources and replacing and reducing fossil energy consumption.

Distributed photovoltaic power generation refers to a distributed power generation system that uses photovoltaic modules to directly convert solar energy into electricity. It is a new, has the broad prospects for development of the power and the way of comprehensive utilization of energy, it advocates the nearby power, came to the interconnection and nearby transformation, using the principle of near, not only can effectively improve the capacity of the same scale photovoltaic power station, it also effectively solves the power loss in the booster and long-distance transportation problem.

At present, the most widely used distributed photovoltaic system is built on the rooftops of urban buildings. Such projects must be connected to the public grid to supply electricity to nearby customers.

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What is a photovoltaic system?

Photovoltaic power generation system can be divided into grid-connected photovoltaic power generation system and independent photovoltaic power generation system according to whether connected to the grid. Grid-connected PHOTOVOLTAIC power generation system mainly refers to the photovoltaic system that is connected to the power grid for operation and dispatching, such as various centralized or distributed photovoltaic power stations. Independent photovoltaic power generation system mainly refers to a variety of photovoltaic power generation systems that operate independently from the power grid, such as solar street lights, rural household photovoltaic power supply, etc., collectively referred to as photovoltaic system.

What is PV + Energy storage?

The combination of photovoltaic and battery as an energy storage device is photovoltaic + energy storage.

What are the benefits of PV + energy storage?

Grid-connected PHOTOVOLTAIC energy storage system: the electricity generated by photovoltaic can be used in the daytime and at night. Distributed metering is used in the daytime and still uses the power grid at night. With the addition of energy storage, the energy storage system can discharge at night. Grid-connected PHOTOVOLTAIC power generation system is directly connected to the distribution network, and the electric energy is directly input to the grid. At present, no energy storage system is configured. With the serious phenomenon of “light abandonment and power limit” of photovoltaic power generation system and the large fluctuation of power output of photovoltaic power generation system, the utilization and promotion of renewable energy are increasingly restricted. Energy storage in grid-connected photovoltaic system has become one of the directions of large-scale energy storage system.

Power output is more smooth, photovoltaic power generation is a process of solar energy into electricity, the output power by solar radiation intensity, the influence of environmental factors such as temperature and violent change, moreover because of the photovoltaic power output for dc current, need after inverter convert alternating current (ac) connected to the electricity grid in the process of inverter harmonic is produced. Due to the instability of pv power and the existence of harmonics, pv power access will impact the power grid. Therefore, an important purpose of energy storage in grid-connected PHOTOVOLTAIC power generation system is to smooth photovoltaic power output and improve the quality of photovoltaic power.

Independent PHOTOVOLTAIC energy storage system: Compared with grid-connected photovoltaic system, independent photovoltaic system refers to the independent operation of the photovoltaic system without access to the power grid. At present, independent systems such as solar street lamps and solar mobile power supply are widely used. Their photovoltaic power output and load power consumption are not in the same time period, as long as there is sunshine installation location is not restricted.