In recent years, with the rapid development of battery energy storage technology at home and abroad, container battery energy storage systems have the advantages of large capacity, high reliability, strong flexibility, and strong environmental adaptability, and have broad application prospects in power grid systems. The lithium battery energy storage system is more mature than other energy storage batteries, has a complete upstream and downstream industrial chain, and has a large space for cost savings. At the same time, my country's power system is in a state of insufficient power supply, low transmission capacity utilization, insufficient credit reserves, and low transmission efficiency during peak power consumption periods. Users have also put forward higher requirements for load-side power quality. These problems have accelerated the rapid development of energy storage technology. Today I will introduce the application scenarios of energy storage containers in a small way!
Energy storage technology is one of the key technologies for developing and building smart grids, which can improve the low-energy quality of the grid and increase the utilization rate of renewable energy. With the rapid development of new generation lithium battery materials and improvements in battery technology, lithium batteries are widely used in energy storage. The container battery energy storage system has the advantages of mature technology, large capacity, movable, high reliability, no pollution, noise reduction, strong adaptability, strong scalability, and easy installation. Therefore, the container energy storage system is used as the energy storage of the power system. Power supply is the future development direction of energy storage.
Distributed power sources, such as diesel generators, photovoltaic power generation, wind power generation, battery energy storage systems, etc., are relatively dispersedly connected to the low-voltage AC bus, and then connected to the voltage level grid above 10 kV through a step-up transformer. When the main power source of the microgrid is an energy storage system or a diesel generator, the microgrid has two operating modes that are used as a reference for system voltage or frequency adjustment.
The energy storage container battery system maintains the stability of the voltage and frequency of the microgrid system through a specific frequency and specific pressure (V/F) control strategy. When running in this mode, the diesel generator is in a stationary state, and the wind power generation system generally adopts the maximum output power tracking control strategy. Even if the wind output power is greater than the load consumption power and the state of charge (SOC) of the energy storage battery system is high, Should be operated under limited power conditions. Fengcai storage operating mode: diesel generator (through excitation and speed regulation) or wind turbine, microgrid system voltage and frequency reference settings, energy storage battery system uses a certain power control (PQ) strategy to receive background control system commands, receive Charge/discharge life of energy storage battery systems.
The energy storage container system includes lithium battery packs, battery management systems, energy conversion systems, control systems and other equipment. The core of the technology is the battery pack, battery cluster structural design, battery system heat dissipation design, battery system protection technology, battery management system, etc. The container energy storage system consists of a battery system and an energy conversion system. The battery system includes advanced lithium iron phosphate battery modules, battery management systems, DC short circuit protection and circuit isolation fuse switches. All equipment is centrally installed on the container.