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A voltage oscillation suppression method, controller and system considering unbalance

A technology for controllers and balance coefficients, applied in the direction of reducing/preventing power oscillations, harmonic reduction devices, and AC networks to reduce harmonics/ripples, etc. DC voltage oscillation and other problems, to achieve the effect of reducing the design capacity, realizing oscillation suppression, and reducing the amplitude

Active Publication Date: 2021-07-30
SHANDONG UNIV
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  • Application Information

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Problems solved by technology

However, when the Vienna rectifier needs to select a DC bus capacitance less than 500uF, whether it is traditional sinusoidal pulse width modulation (SPWM), space vector pulse width modulation (SVPWM) modulation or carrier modulation technology of zero-sequence component injection will cause DC voltage Oscillation and current distortion problems
Especially when the DC voltage is unbalanced, the oscillation and distortion are intensified, and there is a deviation from the expected value, which seriously affects the quality of the subsequent DC power supply

Method used

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  • A voltage oscillation suppression method, controller and system considering unbalance
  • A voltage oscillation suppression method, controller and system considering unbalance
  • A voltage oscillation suppression method, controller and system considering unbalance

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Embodiment Construction

[0041] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0042] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0043] The present invention proposes three carrier modulation structures for component injection:

[0044] 1. ...

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Abstract

The invention discloses a carrier wave modulation method, a controller and a system considering voltage unbalance. Wherein, the carrier modulation method includes: injecting the DC component into the three-phase modulation signal of the Vienna rectifier to obtain the three-phase modulation signal after DC compensation; judging the sector according to the polarity of the three-phase input current of the Vienna rectifier, and according to The consistency between the three-phase modulation signal after DC compensation and the polarity of the three-phase input current determines whether the current sector belongs to the normal range; in the abnormal range, the compensation component is injected into the three-phase modulation signal after DC compensation for use in Eliminate the current distortion on the AC side; in the normal range, inject optimized zero-sequence components into the three-phase modulation signal after DC compensation to suppress the voltage oscillation on the DC side.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a voltage oscillation suppression method, controller and system taking into account imbalance. Background technique [0002] Active power factor correction technology is an effective way to solve the problem of nonlinear components injecting a large number of harmonics into the grid. Three-phase three-level Vienna rectification can realize input unit power factor correction, not only has the advantages of small harmonics, low switching loss and small electromagnetic interference, but also has a simple circuit structure, a small number of switches, and no problem of bridge arm through-through, which is suitable for energy one-way High voltage and high power conversion occasions. In order to further increase power density, reduce volume and cost, and reduce DC bus capacitance has become a new trend in domestic and foreign academic hotspots and industrial applications. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/01
CPCH02J3/01H02J3/24Y02E40/40
Inventor 张承慧丁文龙段彬邱涵王涛杨东江
Owner SHANDONG UNIV
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