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Multi-sampling method for single-phase cascaded H-bridge multi-level converter

A multi-level converter and multi-sampling technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of unrealized sampling interval minimization and achieve small Optimize the sampling interval, improve dynamic performance, and reduce the effect of control delay

Active Publication Date: 2019-05-28
SICHUAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Although this algorithm can improve the control performance of the system to a certain extent, it does not minimize the sampling interval.

Method used

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  • Multi-sampling method for single-phase cascaded H-bridge multi-level converter
  • Multi-sampling method for single-phase cascaded H-bridge multi-level converter
  • Multi-sampling method for single-phase cascaded H-bridge multi-level converter

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Embodiment Construction

[0018] The technical solutions and technical effects of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] figure 1 It shows the carrier phase-shift pulse width modulation and sampling strategy. For the cascaded H-bridge multilevel converter modulation and sampling system, it mainly includes the generation of triangular carrier waves for each sub-module, state variable sampling, modulation wave calculation and update, And the four processes of driving pulse generation:

[0020] (1) Generating the triangular carrier wave of each H-bridge sub-module: the triangular carrier wave is generated by the microcontroller, its cycle is the switching cycle of the switching tube, and the amplitude is ±1.

[0021] (2) State variable sampling: the voltage and current are sampled at the apex and bottom points of the triangular carrier of each H-bridge sub-module and the intersection of each triangul...

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Abstract

The invention discloses a multi-sampling method for a single-phase cascaded H-bridge multi-level converter. On the basis of a carrier phase shift pulse width modulation strategy, voltage and current sampling is carried out at the top points and the bottom points of all triangular carriers and the intersection points of all the triangular carriers through the algorithm, and the minimization of thesampling period can be achieved on the premise that volt-second balance in the pulse width modulation process is guaranteed. The algorithm effectively improves the sampling rate of the system, reducesthe control delay of the system, and improves the dynamic characteristics of the cascaded H-bridge multi-level converter. The method is high in flexibility and can be combined with various linear control strategies to improve the performance of the converter controller.

Description

technical field [0001] The invention relates to the technical field of a single-phase pulse rectifier control system, in particular to a multi-sampling method for a single-phase cascaded H-bridge multi-level converter. Background technique [0002] Single-phase pulse rectifiers have the advantages of bidirectional energy flow, grid side voltage and current maintain unity power factor, and DC side voltage is constant, so they are widely used in high-power railway traction drive systems, UPS power supplies, etc. At present, the control algorithm of single-phase rectifier mainly includes indirect current control, hysteresis current control, transient current control and dq axis current decoupling control. [0003] Usually, the control system of a single-phase pulse rectifier uses a digital controller as the core, and the controlled variable usually requires discrete sampling. The traditional methods include symmetrical regular sampling and asymmetric regular sampling. This trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219
Inventor 马俊鹏王顺亮刘天琪
Owner SICHUAN UNIV
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