A dc/dc converter parallel outer loop current sharing control method

A flow control and converter technology, applied in the field of DC/DC converter parallel outer loop current sharing control, can solve the problem that the DC circulating current does not involve the design of the current sharing controller, and achieve the effect of good robust performance

CN104506037BActive Publication Date: 2017-11-21HARBIN ENG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-11-21

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Abstract

The invention belongs to the technical field of the power electronic technology and in particular relates to a parallel outer ring flow equalizing control method for DC / DC convertor for the DC converter parallel outer ring flow equalizing controller. The method includes: converting the parallel system into small signal transfer function model type; obtaining the inner ring voltage controller according to the small signal open-loop transfer function from the duty ratio to the output voltage; obtaining the voltage closed loop output impedance of the single module; obtaining the transfer functional equation of the flow equalizing controller; using the loop in the Hoo robust control for forming the theory, and setting the frequency domain weighting function different in function for forming the flow equalizing loop gain with ideal expectation characteristic. The design of the flow equalizing controller is converted to the robust loop forming problem for setting the frequency domain weighting function for processing, the ideal flow equalizing loop characteristic can be conveniently obtained, especially, better robust performance can be obtained at the condition that the parallel DC converter model difference and model parameter perturbation information are lacked.
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Description

technical field

[0001] The invention belongs to the technical field of power electronics, and in particular relates to a DC / DC converter parallel outer loop current equalization control method of a DC converter parallel outer loop current equalization controller. Background technique

[0002] With the increasingly higher requirements for the reliability, power capacity and performance of the DC power system, the traditional centralized power supply method can no longer meet these practical applications. Multiple power supply modules are connected in parallel to share the load power evenly, which can reduce the current stress of the main power devices in each module and facilitate the selection of power devices. At the same time, multi-module parallel connection can increase the capacity of the system and improve the reliability of the system. In addition, multiple modules connected in parallel can flexibly form power supply systems of various power levels, replace serializa...

Examples

Embodiment Construction

[0037] The present invention will be described in more detail below with reference to the accompanying drawings.

[0038] combined with figure 1 The two-module Buck converter and its parallel system shown are taken as an example for illustration. In a single Buck conversion, the collector of the power device VT1 (VT2) is connected to the positive terminal of the DC power supply, and the emitter of VT1 (VT2) is connected to the cathode of the diode D1 (D2) and one end of the inductor L1 (L2). The anode of the diode D1 (D2) is connected to the negative end of the DC power supply, the other end of the inductor L1 (L2) is respectively connected to the positive end of the filter capacitor C1 (C2), and connected to the positive end of the load Z, the filter capacitor C1 (C2) Both the negative terminal and the negative terminal of Z are connected together with the negative terminal of the DC power supply. Among them L1 (L2) and C1 (C2) constitute a typical LC filter.

[0039] In o...