Load distribution control method and device for parallel DC switching power supplies
A DC switch and load distribution technology, applied in the direction of load balancing, output power conversion device, control/regulation system, etc. in the DC network, it can solve the problem of not having a reasonable load current distribution and other problems, so as to improve the operation efficiency and simplify the Hardware circuit structure, the effect of improving reliability
Active Publication Date: 2017-02-01
HARBIN ENG UNIV
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Problems solved by technology
However, for the parallel operation of multiple DC switching power supplies with different capacities, there is no better control method to realize the reasonable distribution of load current among the various power supplies.
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[0034] The present invention realizes based on following principle:
[0035]The DC switching power supply chops the input DC voltage by controlling the on and off states of the power electronic devices in the main circuit of the power supply, and then adjusts the output voltage. Therefore, in its output DC voltage and current waveforms, it is inevitable It contains an AC component whose frequency is the switching frequency (that is, the switching frequency of power electronic devices, also known as the chopping frequency). Capacitors, inductors and other devices can be used to filter the output voltage and current, but it is impossible to fundamentally eliminate the AC component whose frequency is the switching frequency.
[0036] Since the output lines of the main circuit of the power supply of all DC switching power supplies running in parallel are connected in parallel, the output voltage and output current of the main circuit of the power supply of each DC switching power ...
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The invention relates to a load distribution control method and device for a parallel direct current switch power supply. The method includes the steps that each power supply body in the parallel direct current switch power supply is controlled independently, wherein both the switch frequency of each power electronic device in each power supply body and the duty ratio of a drive signal are adjustable; the output voltage and an output current signal of each power supply body are collected; the next switch frequency value of each power supply body is calculated according to the corresponding output current signal and the rated current value of the power supply body, and the corresponding switch frequencies are adjusted; meanwhile, the duty ratios of the drive signals are adjusted, and the output voltages and the output current signals are analyzed so that the switch frequencies of other parallel power supply bodies can be obtained; the current load coefficient of each power supply body is calculated according to the current switch frequency of the power supply body and the switch frequencies of the other parallel power supply bodies, the output voltage set value of each power supply body is adjusted, and therefore the duty ratios of the drive signals of the power electronic devices in the power supply body can be adjusted.
Description
technical field [0001] The invention relates to a load distribution control method and device of a parallel DC switching power supply. Background technique [0002] In the actual use of DC switching power supply (the power supply referred to below refers to DC switching power supply), in order to meet the demand of output power, a scheme of parallel operation of multiple power supplies is often adopted. For multiple power supplies with the same capacity running in parallel, certain current sharing control measures must be taken to achieve a reasonable distribution of load current, thereby improving the safety of each power supply. However, for the parallel operation of multiple DC switching power supplies with different capacities, there is no better control method to realize the reasonable distribution of load current among various power supplies. Contents of the invention [0003] The purpose of the present invention is to provide a load distribution control method and ...
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IPC IPC(8): H02M3/00H02J1/10H02J1/14
Inventor 张强于立君刘政宇张敬南程鹏霍虹王锐王思阅
Owner HARBIN ENG UNIV