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A unidirectional hybrid three-phase three-level rectifier

A three-level rectifier, hybrid technology, applied in electrical components, AC power input into DC power output, irreversible AC power input into DC power output and other directions, can solve the three-level rectifier AC current harmonics, Efficiency, power density, reliability problems, uncontrollable output voltage, large low-frequency harmonic components, etc., to achieve the effect of easy digitalization, stable output voltage, and reduced harmonic components

Active Publication Date: 2020-06-30
河南纽瑞电气科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The low-frequency harmonic component of diode uncontrolled rectification is large, the DC voltage pulsation is obvious, and the output voltage is uncontrollable, which is only determined by the grid voltage
However, how to further improve the AC current harmonics, efficiency, power density, reliability and other performances of the PWM three-level rectifier has become a major problem.

Method used

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  • A unidirectional hybrid three-phase three-level rectifier
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  • A unidirectional hybrid three-phase three-level rectifier

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Embodiment Construction

[0031] A unidirectional hybrid three-phase three-level rectifier proposed by the present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0032] like figure 1 As shown, the unidirectional hybrid three-phase three-level rectifier of the present invention is made up of 5 modules, wherein module 1 is made up of filter inductor; Module 2 and module 3 are three-phase diode rectifier bridge and three-phase IGBT rectifier bridge respectively; Module 4 is an IGBT boost circuit; module 5 is a filter capacitor.

[0033] The input terminals of module 1 are respectively connected to the incoming lines of each phase of the power grid, and the output terminals are respectively connected to the midpoints of the bridge arms of each phase of module 2 and module 3.

[0034] When the positive half of the sine wave is input, the two tubes are turned on to get a positive output; when the negative half of the sine wave i...

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Abstract

A unidirectional hybrid three-phase three-level rectifier is composed of a three-phase rectifier bridge, a filter, a boost circuit, a voltage sensor, a current sensor, a DSP controller, and a signal conditioning circuit for closed-loop control. The rectifier consists of five modules. A module 1 is composed of a filter inductor. A module 2 and a module 3 are respectively a three-phase diode rectifier bridge and a three-phase IGBT rectifier bridge. A module 4 is an IGBT boost circuit. A module 5 is a filter capacitor. The rectifier is mainly characterized in that a diode bridge rectifier circuitand a PWM rectifier circuit are combined, control and voltage output are stable, the rectifier has excellent power tracking ability and strong robustness, and harmonic components are reduced.

Description

technical field [0001] The invention belongs to the field of voltage type rectification, in particular to a unidirectional hybrid three-phase three-level rectifier. Background technique [0002] A rectifier circuit is a circuit that converts AC power into DC power. Most electronic devices are driven by DC, so a rectifier is used to obtain a controllable or uncontrolled DC voltage. The conventional rectification link widely uses a diode uncontrolled rectification circuit or a thyristor phase-controlled rectification circuit. [0003] The low-frequency harmonic component of diode uncontrolled rectification is large, the DC voltage pulsation is obvious, and the output voltage is uncontrollable, which is only determined by the grid voltage. Thyristor phase-controlled rectifiers have a low power factor, easily cause electromagnetic interference, and cause serious distortion of input current. [0004] In recent years, PWM three-level rectifiers have been widely used in applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/06H02M7/219H02M1/12
CPCH02M1/12H02M7/06H02M7/219
Inventor 马辉彭以平钟明明王良凯
Owner 河南纽瑞电气科技有限公司
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