Application of lithium iron phosphate battery pack power supply system in a substation. The DC power supply is the heart of the substation, and the battery is the last barrier to the power supply. The manufacturers of energy storage electric lithium batteries feel that they have analyzed the application of lithium iron phosphate battery packs in the substation system from the aspects of performance, purchase cost, use, and maintenance cost, safety, and exhaust gas treatment. Feasibility believes that the application of lithium iron phosphate batteries in substations is an inevitable development trend.
As an important part of the substation, the stability, safety, and reliability of the substation DC system are particularly important. With the rapid development of my country's power technology and the increase in power demand year by year, the traditional substation DC system can no longer meet the development of the power grid. It is urgent to adopt economic and scientific strategies to transform it.
Lead-acid batteries hinder the modernization of substations due to their inability to withstand high temperatures, overcharge, over-discharge, and heavy maintenance. In this regard, it is necessary to continuously explore and apply new products, new materials, and new technologies. Compared with other batteries, lithium iron phosphate batteries have a long life, safe use, green environmental protection, high current charge and discharge, high-temperature resistance, and self-discharge. With the characteristics of low rate, no memory effect, small size and lightweight, it is of great significance to study the application of lithium iron phosphate battery packs in substation DC power supply systems.
The large-capacity lithium iron phosphate battery pack is composed of batteries, a battery management system (BMS), and protection circuits. Lithium iron phosphate battery packs are usually installed in special battery rooms in substations. The application environment is good, and there will be no overheating, vibration, squeezing, or short-circuiting of batteries. Therefore, the key to its application safety is that overcharging and overcharging cannot occur. put. The substation lithium iron phosphate battery pack is composed of multiple single cells in series. The inconsistency between the cells will cause the charging voltage of each cell to have a gap during the charging process. If no equalization measures are taken, the cells will be charged. The difference gradually increases, eventually leading to failures such as individual overcharge and high temperature, resulting in a reduction in the service life of the entire battery pack, and even an explosion when it is scrapped.
The outstanding advantage of the lithium iron phosphate battery pack is its excellent overcharge resistance performance. Due to its low working voltage, it is determined that its overcharge resistance performance is good. The outstanding characteristics of lithium iron phosphate batteries, such as long life, relatively high safety, and extensive material sources, have attracted the attention of the industry. In the future, lithium iron phosphate batteries are expected to become the main selection equipment for DC power supplies in power systems.
The bottleneck of the lithium iron phosphate battery pack in the DC system of the substation: 1. The operation experience of the lithium iron phosphate battery pack in the DC system of the substation is insufficient. 2. The price or cost performance of the lithium iron phosphate battery pack for the DC system of the substation is currently not clear, and there is not much advantage. 3. At present, all valve-regulated lead-acid batteries in the DC system lithium iron phosphate battery packs of substations are generally used for more than 5 years, nominally 8-12 years, and have formed an overall operation and maintenance experience. Replaced with lithium iron phosphate battery packs in a short time It is unlikely.
Summary: Because of its superiority, lithium iron phosphate battery packs have been used in more and more domestic power systems. In recent years, the application of lithium iron phosphate batteries to substation DC systems has gradually deepened. Its excellent characteristics and considerable economic benefits It has a wide range of application prospects in power systems.
