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A mid-point clamped three-phase three-level converter and its modulation method

A modulation method and clamping type technology, which can be applied in the direction of converting AC power input to DC power output, electrical components, and output power conversion devices, which can solve problems such as affecting the three-phase common mode voltage waveform.

Active Publication Date: 2019-09-20
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a midpoint-clamped three-phase three-level converter and its modulation method to solve the problem in the prior art that seriously affects the three-phase common-mode voltage waveform

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  • A mid-point clamped three-phase three-level converter and its modulation method
  • A mid-point clamped three-phase three-level converter and its modulation method
  • A mid-point clamped three-phase three-level converter and its modulation method

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Embodiment Construction

[0058] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

[0059] The invention provides a modulation method of a midpoint clamp type three-phase three-level converter to solve the problem of severely affecting the three-phase common mode voltage waveform in the prior art.

[0060] The modulation method of the midpoint clamp type three-phase three-level converter is applied to the controller in the midpoint clamp type three-phase three-level converter. The midpoint clamp type three-phase three-level converte...

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Abstract

The present invention provides a method for modulating a neutral-point-clamped type three-phase three-level converter. It is determine whether a power factor is greater than a preset threshold, a fixed component is injected into a three-phase voltage modulation wave when the power factor is greater than the preset threshold, and three-phase voltage modulation is performed by using dual modulation wave carrier when the power factor is smaller than the preset threshold. That is, by injecting the fixed component and the double modulation wave carrier into the three-phase modulation wave within different system power factor ranges, under the premise that the system direct-current bus capacitance is reduced to a certain extent, the neutral-point potential fluctuation and the common-mode voltage waveform are still within the controllable and acceptable range.

Description

Technical field [0001] The present invention relates to the technical field of power electronics, in particular to a midpoint clamp type three-phase three-level converter and a modulation method thereof. Background technique [0002] The diode midpoint clamped three-level converter topology and the ANPC (Active Neutral Point Clamped, active midpoint clamped) three-level converter topology are two widely used three-level topologies. Such as figure 1 As shown, for the diode midpoint clamp three-level converter topology, AS5, AS6, BS5, BS6, CS5, and CS6 are diodes, and the rest are switching tubes; for the ANPC type three-level converter topology, all The switches are all switch tubes. Both of them have the problem of potential fluctuation at the midpoint of the DC bus. The midpoint potential fluctuation of the DC bus will affect the output voltage and current THD, device voltage stress, common mode voltage, system loss and other aspects. Therefore, corresponding solutions are nee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/487
Inventor 庄加才王新宇崔雨晴徐君顾亦磊
Owner SUNGROW POWER SUPPLY CO LTD