Self-current-sharing method based on integrated parallel power supply monitoring system

Abstract

The invention discloses a self-current-sharing method based on an integrated parallel power supply monitoring system. According to the self-current-sharing method based on the integrated parallel power supply monitoring system, current-sharing control of the power supply modules is efficiently achieved, and signal errors are reduced. The method comprises the following steps: after a parallel module is started, CAN bus communication connection is carried out between parallel power supply modules, a CPU (Central Processing Unit) calculates a main module and obtains the number of modules connected in parallel on a current bus, and the number is N; the output current I of all the parallel modules is collected through the CPU; each power supply module compares an ideal current value with the output current I of the parallel modules, and calculates and adjusts an output PWM wave through a PID algorithm in a CPU processor, thereby controlling fine tuning of an output voltage, increasing or reducing an output current, and achieving the purpose of current sharing. The method has the characteristics of efficiently realizing current-sharing control of the power supply module, reducing signal errors and the like.

Description

technical field [0001] The invention relates to an integrated power supply system, in particular to a self-equalizing method based on an integrated parallel power supply monitoring system. Background technique [0002] The integrated power supply system, as the main power supply equipment for the station, its own working performance, power supply quality, loss and other factors are all used as inspection indicators for the maturity of the system. In the current substation, a series power supply is usually used to increase the terminal voltage of the battery pack to 220V to connect to the DC bus, and act as a backup power supply to connect to the normal working power supply system when the AC power failure occurs. The invention relates to a parallel power supply, the essence of which is an integrated power supply system in which a 12V battery pack is mounted on a parallel module, and 16 modules are connected in parallel to the system to realize power supply. [0003] The par...

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Problems solved by technology

[0006] Some of the current sharing methods described above require the cooperation of cooperating machines: such as the master-slave and maximum current sharing control methods, and some require external equipment for current sharing control, such as an external current sharing controller. The material cost Compared with the R&D cost, it is relatively high, and non-system custom current sharing control may lead to the current sharing accuracy not meeting the requirements, and may even lead to abnormal current sharing process. If AC power loss occurs at this time, it is difficult to ensure the integrated power supply power supply reliability

Moreover, the above-mentioned methods all use the current-sharing signal drawn from the inside of the module through the operational amplifier. There is a large error in the signal sent out, which is difficult to avoid in the process

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