Battery energy storage system containers
Taking the 1MW/1MWh energy storage system container as an example, the system generally consists of an energy storage battery system, a monitoring system, a battery management unit, a special fire protection system, a special air conditioner system, an energy storage converter and an isolation transformer, and is finally integrated in a 40-foot container.
The battery system is mainly composed of cells in series and parallel: first, a dozen groups of cells are connected in series and parallel to form a battery box, then the battery boxes are connected in series to form a battery string and increase the system voltage, and finally the battery strings are connected in parallel to increase the system capacity, and Integrated installation in the battery cabinet.
The monitoring system mainly monitors the functions of external communication, network data monitoring and data acquisition, analysis and processing, ensuring accurate data monitoring, high voltage and current sampling accuracy, data synchronization rate and fast execution speed of remote control commands; the battery management unit has high-precision monomers. The voltage detection and current detection functions ensure the voltage balance of the battery modules and avoid circulating currents between the battery modules, which affects the operating efficiency of the system.
In order to ensure the safety of the system, the container is equipped with a special fire protection and air conditioning system. The fire protection system senses the fire through smoke sensors, temperature sensors, humidity sensors, emergency lights and other safety equipment, and automatically extinguishes the fire; the special air conditioning system according to the external environment temperature, The cooling and heating system of the air conditioner is controlled by the thermal management strategy to ensure that the temperature in the container is in a suitable range and prolong the service life of the battery.
The energy storage converter is an energy conversion unit that converts battery DC power into three-phase AC power, which can operate in grid-connected and off-grid modes. In grid-connected mode, the converter interacts with the power grid according to the power command dispatched by the upper layer; in off-grid mode, the energy storage converter can provide voltage and frequency support for the plant load, and provide black-start power for some renewable energy sources. The outlet of the energy storage converter is connected to the isolation transformer, so that the electricity of the primary side and the secondary side is completely insulated, and the safety of the container system is guaranteed to the greatest extent.
Mobile energy storage systems have been widely used in power system transmission, distribution and other fields due to their outstanding flexibility and convenience. Compared with the traditional fixed energy storage power station, the modular design of the container energy storage system adopts the internationally standardized container size, which allows ocean and road transportation, and can be hoisted by overhead cranes, with strong mobility and no geographical restrictions. In addition, the container energy storage system can be produced in a factory, and can be assembled and debugged directly in the workshop, which greatly saves the construction and operation and maintenance costs of the project, and monitors accident isolation. It is believed that with the continuous breakthrough of battery technology, the energy density of mobile energy storage systems will be further improved, and the cost will be greatly reduced. The actual value of mobile energy storage systems will continue to be reflected, and the scope of application will continue to expand. It will become an important carrier to promote the revolution of energy production and consumption, and it is a technology and industry with great development prospects in the energy Internet.
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