Stability analysis method of DC-DC converter parallel system

An analysis method, DC-DC technology, applied in control/regulation systems, parallel operation of DC power supplies, conversion of DC power input to DC power output, etc. The system stability analysis is complex and other problems, to achieve the effect of simple derivation, avoiding complex derivation, and good scalability

Active Publication Date: 2017-11-03
BEIJING JIAOTONG UNIV
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Problems solved by technology

In this method, although the small-signal model of the parallel system is simplified, a large number of transfer functions still need to be derived, and the expression of the open-loop transfer function is very cumbersome, which makes the stability analysis of the parallel system still very complicated
That is, the lengthy transfer function makes it difficult for the existing stability analysis methods to meet the application requirements, and it is difficult to extend to the stability analysis of multi-DC-DC converter parallel systems

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  • Stability analysis method of DC-DC converter parallel system
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[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0036] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element refe...

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Abstract

The invention discloses a stability analysis method of a DC-DC converter parallel system. The DC-DC converter parallel system comprises a plurality of DC-DC converts which are connected in parallel. The stability analysis method comprises the following steps of performing average modeling on the DC-DC converter parallel system to obtain a large signal equivalent model of the DC-DC converter parallel system; and judging the stability of the DC-DC converter parallel system by the large signal equivalent model of the DC-DC converter parallel system according to a Floquet theory. By the stability analysis method and the DC-DC converter parallel system, complicated derivation of a open-ring transfer function which is required by a traditional Nyquist stability criterion-based stability analysis method is prevented; and meanwhile, the modeling performed on the multi-DC-DC converter parallel system to obtain the large signal equivalent model and the stability criterion deviation based on the Floquet theory are simpler and more convenient, and better expandability is achieved.

Description

technical field [0001] The invention relates to the technical field of a DC-DC converter parallel system with current sharing control, in particular to a stability analysis method for a DC-DC converter parallel system. Background technique [0002] DC-DC converter parallel system is widely used in DC distributed power supply system. In order to ensure that the load current of each converter in the parallel system can be evenly distributed, the current sharing control technology is generally used. However, the use of current-sharing control introduces additional complexity into the parallel system. At the same time, the interaction between converters and the complex feedback loop make the stability analysis of the parallel system more complicated during parallel operation. [0003] In the related art, the stability analysis method of the DC-DC converter parallel system mainly focuses on frequency domain analysis. [0004] Among them, one method is to use Nyquist stability c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02M3/158
CPCH02J1/102H02J1/106H02M3/1584
Inventor 李虹任芳张波吕金虎郑琼林郝瑞祥林飞杨中平孙湖
Owner BEIJING JIAOTONG UNIV
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