Vanadium flow energy storage battery is a large-scale electricity storage device widely used in wind energy and solar power generation systems. The article introduces the working principle of vanadium flow batteries, and designs an energy storage management and control system based on its operating characteristics and key issues such as energy efficiency, economy, and reliability in the practical process, including a central control module, power Conversion control module, flow and transportation control module, battery charge and discharge management module, safety protection monitoring module, etc., and summarized the technical characteristics and application prospects of the system. This system can achieve stable, efficient and safe management and control of vanadium redox flow batteries.

The pursuit of new energy and low-carbon economy has led countries around the world to vigorously develop green energy such as wind energy and solar energy. However, the power generation process of wind energy, solar energy and other renewable energy sources is unstable and discontinuous, resulting in a decline in the power quality of the power grid, resulting in waste of electrical energy and Equipment failure. Therefore, before wind energy and solar energy are input into the grid, it is extremely important to add a new environmentally friendly vanadium redox flow battery (VRB) energy storage system for smooth energy conversion.

1. Working principle of vanadium battery

The vanadium flow energy storage battery system is a system that converts and stores wind energy, solar energy and other energy with chemical energy. The main unit of the energy storage system is the vanadium battery. Compared with traditional batteries such as lead-acid batteries and nickel-cadmium batteries, the battery has its own unique internal and external structures and operating modes. In terms of performance, it is more suitable for large-scale energy storage power stations such as wind energy and solar energy and smart grid peak shaving. and other applications. Its main components are: stack system, electrolyte and electrolyte storage and transportation system, and energy conversion and control system, as shown in Figure 1.

The battery stack is assembled from a different number of single cells arranged in sequence according to the required electrical power. The positive and negative electrolyte solutions are stored in two storage barrels respectively, and chemical pumps are used to drive the electrolyte to flow through the positive and negative electrodes of the battery stack. An electrochemical reaction occurs in the battery stack to realize the conversion of electrical energy and chemical energy. The output power of the battery stack is determined by the total area of the battery electrodes; the battery capacity is determined by the total capacity of the electrolyte solution.

2. Energy storage system structure and functions of each module

The vanadium flow battery energy storage system involves multiple components such as new energy power generation, battery stack and electrolyte transportation management, power electronic conversion system, power load or power system, etc. It is the mutual coupling of electrochemistry, chemical industry, electrical and network information. It is a complex dynamic system, and its operating characteristics are related to various factors such as the combination method and capacity of the flow energy storage battery system, as well as the power converter, power load, and control method. How to improve the energy efficiency, economy and reliability of the entire system while ensuring the safe and stable operation of the system is a key issue that must be solved in the practical process of large-scale flow battery energy storage systems. Therefore, it is necessary to combine high-efficiency power conversion technology, battery charge and discharge control and management, advanced sensing and communication technology and modern optimal control theory to establish a high-performance vanadium battery energy storage management and control system, which will greatly improve the development of all-vanadium redox flow energy storage systems. High performance and normal operation play a very important role.

The energy storage management and control system consists of a central control module, a power conversion control module, an electrolyte flow and transportation control module, a battery charge and discharge management module, and a system safety protection monitoring and management module.

Related suggestion：

18350-1050mAh 3C

14500-1250mAh 3C

16340-800mAh 3C

Research on the performance of soft-packaged lithium-ion batteries?

New water treatment technology doubles lithium battery production