Backup energy storage parallel operation system and control method thereof
An energy storage system and control method technology, applied in the field of energy storage, can solve problems such as difficult implementation and complicated control methods, and achieve the effect of simple control, simple connection mode, and easy realization
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Embodiment A
[0063] Embodiment A, uneven current control mode:
[0064] Such as Figure 6 As shown, the output ends of the DC / DC modules of the backup energy storage system 1 and 2 are first connected together, and the load is connected to the AC interface output of the backup energy storage system 1. Then by limiting the output power of each DC / DC module, the purpose of increasing the overall output power of the parallel system is achieved.
[0065] Such as Figure 7a As shown, the over-current step-down method is used to determine whether the output mode of the DC / DC module is the limited voltage mode or the limited current mode by detecting the output current of the DC / DC modules of the two backup energy storage systems. The specific steps are as follows:
[0066] A1. The two backup energy storage systems respectively set the DC / DC module to the mode of constant voltage and limited current, and the rated current value of the DC / DC module;
[0067] A2. The DC / DC modules of the two bac...
Embodiment B
[0073] Embodiment B, non-communication current sharing control method:
[0074] The connection mode of this embodiment is the same as that of embodiment A. Such as Figure 6 As shown, the DC / DC output terminals of backup energy storage systems 1 and 2 are connected together, and the load is connected to the output terminal of the AC interface module of backup energy storage system 1. The output power of each DC / DC module is limited to achieve The purpose of output power increase.
[0075] Such as Figure 8a As shown, the output voltage perturbation method is used to make the output currents of the two backup energy storage systems close, and the specific steps are as follows:
[0076] B1. Two backup energy storage systems respectively set the reference voltage value U of the DC / DC module ref , and the output voltage disturbance ΔU=k*I, where k is the disturbance coefficient and I is the output current;
[0077] B2. The two backup energy storage systems respectively detect...
Embodiment C
[0082] Embodiment C, communication current sharing control method:
[0083] Such as Figure 9 As shown, the difference between the parallel system of this embodiment and Embodiment A is that the two MCU modules are connected through a communication line. The communication method is generally RS232 or RS485.
[0084] Such as Figure 10a As shown, the communication current sharing control method and the slave communication current sharing method are used to make the output currents of the two backup energy storage systems close. This control method uses a backup energy storage system operating voltage loop and a backup storage system. The system can run the current loop. It is equivalent to one backup energy storage system operating normally as the host, and the other receiving the current information sent by the host, and using the parallel current value as the input value of the control loop. Specific steps are as follows:
[0085] C1. Set one of the backup energy storage...
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