A Control Circuit of Interleaved Parallel Vienna Rectifier Without Differential Mode Inductance

Abstract

A non-differential mode inductance staggered parallel Vienna rectifier and its control circuit, the rectifier includes a grid-side filter circuit and an staggered parallel Vienna rectifier circuit; the grid side filter circuit and the staggered parallel Vienna rectifier circuit, the staggered parallel Vienna rectifier circuit, and the staggered parallel Vienna rectifier circuit It includes a three-phase coupled inductor, first to twelfth power switch tubes, and first to twelfth power diodes, and discloses a control circuit of the rectifier. The invention uses the grid-side filter circuit to suppress harmonics near the switching frequency; uses the leakage inductance of the coupled inductance to replace the differential mode inductance to reduce the volume and weight of the converter; uses the staggered parallel mode to increase the converter capacity and reduce the current stress of the switch tube , reduce the input current ripple and output voltage ripple, thereby reducing the capacitance of the busbar capacitance and the volume weight of the magnetic components; with low total harmonic distortion, small volume and weight, small input current ripple, small output voltage ripple, etc. Features.

Description

technical field [0001] The invention belongs to the technical field of power electronic converter control, and in particular relates to a control circuit of a Vienna rectifier with no differential mode inductance interlaced in parallel. Background technique [0002] The rectifier circuit is a nonlinear topology, which will bring a lot of harmonics, causing a series of problems such as harmonic pollution and reactive power loss. At this stage, it is mainly improved from two aspects: one is to start from the power system itself, adding reactive power compensation devices and filters and other equipment on the grid side; the other is to improve the power factor correction performance of power electronic devices. Among them, the Vienna rectifier circuit, as a kind of power factor correction converter, is of great significance to improve harmonic pollution and reactive power loss due to its advantages of avoiding bridge arm direct connection and three-level clamping structure. ...

AI Technical Summary

Problems solved by technology

[0003] In the traditional Vienna rectifier, the presence of inductance and the delay effect of the current inductor will cause a small phase shift, resulting in zero-crossing distortion, resulting in an excessively high total harmonic distortion rate of the converter

In response to the above problems, the document "Xu H, YaoW, Shao S, et al. Improved SVPWM schemes for vienna rectifiers without current distortion [C]. european conference on cognitive ergonomics, 2017: 3410-3414." proposed to use the space vector pulse width modulation method , according to different current directions to determine the limit range of the vector, so as to select the appropriate vector, reduce the zero-crossing distortion, but because of the emphasis on control efficiency, the total harmonic distortion rate of the whole machine is still high

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