Electronic management method and system of battery

Abstract

The invention discloses an electronic management method and system of a battery. The method comprises the following steps of acquiring a voltage stage of a single battery; determining to execute at least one of the following operation: stimulation operation, optimization operation and balancing operation on the single battery according to the acquired voltage state of the single battery; and outputting a pulse width modulation (PWM) signal to the single battery according to the determined operation. By the method, PCS control and BMS control are combined, so that PCS power partial control and battery system control and application can be effectively combined and coordinated, moreover, the cost can be reduced, the expansibility can be improved, a battery electronic module is easy to connect in series/parallel, and hot plug is facilitated.

Description

technical field [0001] The present invention relates to the field of energy, in particular to a battery electronic management method and system. Background technique [0002] At present, how to store electric energy in the grid has always been an important problem to be solved in the energy field. In order to solve this problem to a certain extent, DC / AC single-stage or DC / DC+DC / AC two-stage bidirectional power converters are used in the prior art to realize bidirectional power flow between the battery and the grid. [0003] Since the current energy storage system uses multiple batteries connected in series to form a high-voltage DC battery pack, once any battery unit in the battery pack is damaged, the entire energy storage system will not work properly, which is not suitable for safe power supply. occasions, such as coal mines, oil fields and other industrial occasions. [0004] The Chinese patent document "A Modularized Medium-voltage Energy Storage System" (publication...

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Problems solved by technology

[0003] Since the current energy storage system uses multiple batteries connected in series to form a high-voltage DC battery pack, once any battery unit in the battery pack is damaged, the entire energy storage system will not work properly, which is not suitable for safe power supply. occasions, such as coal mines, oil fields and other industrial occasions

[0004] The Chinese patent document "A Modularized Medium-voltage Energy Storage System" (publication number CN102355065) provides a way to realize energy storage. The primary side adopts a star connection, and realizes charging, discharging, and equalization by controlling the three phase voltages. However, the energy storage system needs to properly control the amplitude and phase of the three-phase voltage when performing phase-to-phase balance and fault redundancy control. Due to the mutual coupling of the control of the three-phase voltage, the control is difficult, which is not conducive to its stability. run

[0005] The Chinese patent document "A Large-Capacity Medium-Voltage Battery Energy Storage System" (publication number CN103199630A) provides another way to realize energy storage. The battery module still uses a high-voltage module, and it has to withstand twice the power that the system itself cannot overcome. Frequency power pulsation will have a certain impact on battery life and normal use, and the connection mode of direct connection on the AC side will make the fault design of the system more complicated, and will also generate common mode interference, which is not conducive to the normal operation of the management and control system

The state of charge SOC is related to the battery model. Aging or process may make the parameters of the battery model different. In order to dynamically update the SOC, a complete battery discharge process needs to be performed, which is inconvenient to monitor battery performance.

[0008] Finally, in order to enable the energy storage system to be applied to different power generation, transmission, and distribution occasions, to play the role of peak shaving and valley filling, improving new energy grid connection capabilities, island operation, grid frequency regulation, and backup power, it is necessary to provide energy storage systems with control, and the existing energy storage system is composed of battery management system (BMS) and power conversion system (PCS) divided into two modules, and upload information to the main controller respectively, poor integration, high cost, so it is necessary Propose a low-cost, high-efficiency energy storage system control technology solution

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