Lithium iron phosphate battery in the application of the micro grid energy storage system

Source: 2020 - 04 - 10 19:51 hits: time 1 overview of micro power grid is a collection of load and micro energy collector, normal operation mode in the network, an emergency can run independently, and so on and so forth. During this two modes, the grid system is an important unit, high-performance energy storage system can store excess energy, needs to be loaded, make full use of all kinds of energy, has played a vital role in the whole micro power grid, the lithium iron phosphate battery with its superior performance is applied to the micro grid, can significantly improve the overall performance of the micro grid system and energy efficiency. 2. Micro grid functions and characteristics of the micro grid is a new grid is different from the traditional power grid. Deepen the research of the micro smart grid in different countries in the world, although the definition of micro smart grid is not the same, but the purpose of which is more or less the same, in order to improve the security of power system, for example, to ensure the reliability of power supply, improve power quality, improve the utilization rate of all kinds of energy. Based on the requirement of the functional requirements, the micro grid can be connected to the grid power operation, but also can cut off the power grid of independent operation, thereby greatly improving the power supply reliability of the power grid and the safety of the power system. For power grid, the micro grid smart grid can not only absorb energy, but also quickly switch their countries according to the operation state of power grid, in order to choose whether to cut off the grid and grid connection or absorb energy to supplement their own needs. For power users, the micro power grid to meet their specific needs, such as increasing the reliability of power supply, shortening the distance between the power supply, so as to reduce the wastage of the transmission line. 3. Energy storage system, the necessity of energy storage technology is important means to realize the basic function of micro power grid. The main reason for the micro grid need to store electricity is as follows: ( 1) Ensure the reliability of power supply system; ( 2) Ensure the quality of power supply; ( 3) To improve the comprehensive utilization of energy efficiency; ( 4) Improve grid performance of various kinds of new energy. Therefore, high-performance energy storage system is to achieve its own function of micro power grid. 3. 1 type energy storage system has a long history of the development of energy storage technology, its form is varied. In addition to the daily life of common lead-acid batteries, lithium batteries, and pumped storage, flywheel energy storage, superconducting magnetic energy storage, superconducting capacitor energy storage, liquid vanadium battery, sodium sulfur battery, nickel metal hydride batteries, etc. The international mainstream batteries include: lead-acid batteries, lithium ion battery, nickel metal hydride batteries, etc. Superconducting capacitor energy storage flywheel energy storage, superconducting magnetic energy storage, are still in research stage, has not been applied on a large scale. Lead-acid battery has set up a file in the micro grid energy storage system for the application of a certain size, but because of its own characteristics, some disadvantages appeared gradually. 3. 2 the characteristics of the traditional lead-acid battery energy storage system lead-acid battery demanding to the ambient temperature: traditional representative is lead-acid battery energy storage system. Lead-acid battery requirements to the ambient temperature is very high, that is to say, it improves the using situation of environmental requirements. Lead-acid battery has a high requirement on the transformer room: a set of system of power distribution equipment, mainly some power equipment, and power equipment in the area and weight of the transformer room is not allow to ignore. The performance of lead-acid batteries at high discharge rate difference: when the micro grid operation mode switch connected to the grid independent operation, energy storage system will flow large current in a short period of time, need the high rate discharge performance of energy storage system, and traditional lead-acid battery energy storage system of poor poor performance. Lead-acid battery monitoring is inaccurate: lead-acid battery monitoring system are mostly based on voltage to judge, the accuracy of this method is very limited, leading to a long period of time, energy storage system is stored in the electric measurement will be a great deviation. Lead-acid battery pollution to the environment: lead-acid battery caused by lead to environmental pollution, so in the production and waste treatment, will cause serious pollution to the environment.