Parallel outer ring flow equalizing control method for DC/DC convertor

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.

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...

AI Technical Summary

Problems solved by technology

[0004] Regarding the design method of the current sharing loop controller, Emerson has applied for an invention patent (application number CN02135001.9) for the circulation suppression of single-phase inverters, and the Institute of Electrical Engineering of the Chinese Academy of Sciences has applied for an invention patent (application number CN200510130610.4) The main thing to eliminate is that the DC circulating current does not involve the design problem of the current sharing controller described in this patent

Images