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BMS energy storage system

With the rapid development of batteries, battery energy storage system (BatteryEnergyStorageSystem, BESS) is more and more widely applied in the field of multiple power, for example in the power system peak cutting and discharge way by charging, peak valley price price reduce the user"s electricity expenses; Smooth output in the new energy generation system of photovoltaic and wind power generation, and reduce the interference of randomness and volatility of new energy generation to the power system; Provide backup power in the unstable area to ensure normal power consumption. Figure 1 is a schematic diagram of the electrical connection structure applied on the grid side of a typical battery energy storage system. The whole system is mainly composed of battery system (battery cell, battery management system BESS), energy conversion system (PCS) and key equipment of the monitoring system.

Key technology of energy storage system: battery management system

Battery management system (BMS) as the core component of battery energy storage system, responsible for energy storage battery voltage, temperature, current, power, such as information acquisition, real-time condition monitoring and fault analysis, at the same time through the CAN bus communication and PCS online communication, monitoring and scheduling system, optimize the battery charge and discharge management control. Each battery pack of the system is equipped with a battery management system, which can effectively and efficiently use the energy storage battery of each cluster and achieve the purpose of overall reasonable allocation.

The core technology of BMS

In general, BMS system usually includes detection module, operation module and control module.

The main function of the test module is to measure the battery voltage, battery voltage, battery current and system temperature. The main function of the module is to calculate and judge the acquisition voltage, current and temperature according to certain rules. The main function of the control module is to make corresponding control actions according to the judgment information given by the operation module. The most important part is the operation module, whose main work is the battery state estimation algorithm and fault alarm and diagnosis. State estimation includes SOC (State Of Charge), SOH (State Of Health), and SOP (State Of Power). Battery State estimation is usually used to estimate SOC, SOP and SOH. SOC is simply how much power is left in the battery; SOC is the most important parameter in BMS. Since everything else is based on SOC, its accuracy and robustness (also known as error-correcting ability) are extremely important. If there is no precise SOC, no amount of protection can make the BMS work properly, because the battery will always be protected and the battery life cannot be extended. Based on the estimation values of voltage, current, temperature and state collected, the fault alarm and diagnosis were conducted based on the rule parameters such as battery self-characteristics and application condition.