A self-disturbing current sharing control method

Abstract

The invention discloses a self-disturbance type current sharing control method. The entire parallel power supply system forms a closed loop, including a current given control module and n power supply modules, and the given current is I ref , the total output current is I out , I ref with I out equal in magnitude, the output current of a single power supply is I 1 , I 2 ...I n , I 1 , I 2 ...I n Equal in size, equal to I out / n; the current output I of each power module at the beginning 11 , I 21 ...I n1 are equal to zero, at this time the total current I out1 equal to zero, I ref and I out1 The difference is greater than the threshold k 2 , the power given module outputs a quantitative △I, the magnitude of which is k. In order to solve the problem of uneven current distribution when DC power supplies are connected in parallel, the invention can make full use of the effective capacity of each power supply, improve the safety and reliability of operation, and reasonably distribute the load current borne by each power supply.

Description

technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, relates to an independent disturbance digital high-precision current sharing algorithm for N+X parallel operation of DC power supplies. Background technique [0002] With the development of science and technology, the demand for high-power, high-power-density, and high-reliability power supply systems continues to increase. If a single power supply is used for power supply, due to the relatively large power to be processed, it will bring difficulties in the selection of power devices, the improvement of switching frequency and power density. In addition, once the power fails, it will lead to the collapse of the entire system. Therefore, using multiple power modules to operate in parallel to output high power is an important direction for the development of power supply technology. In a parallel system, each converter only handles a small power. Since eac...

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Problems solved by technology

[0004] In order to solve the problem of uneven current distribution when DC power supplies are connected in parallel, the present invention provides an independent disturbance digital high-precision current sharing algorithm for N+X parallel operation of DC power supplies, which can make full use of the effective capacity of each power supply and improve the safety of operation at the same time performance and reliability, reasonably distribute the load current borne by each power supply

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