Control method of convertor, apparatus and system

A control method and technology of a control device, applied to output power conversion devices, AC power input conversion to DC power output, electrical components, etc., can solve the risk of increasing the saturation of coupling inductors, the overcurrent risk of switching devices, and the large difference in output voltage Large and other problems, to achieve the effect of reducing noise, reducing peak value, reducing excitation current

Active Publication Date: 2015-12-30
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology

[0004] However, when DPWM modulation is applied to a magnetically coupled multilevel converter, since the phase difference of the triangular carrier waves of the three three-level units in the converter is relatively large, each phase differs by 120 degrees, then, when superimposed on Sx When the injection amount of α changes too much, the output voltag

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  • Control method of convertor, apparatus and system
  • Control method of convertor, apparatus and system
  • Control method of convertor, apparatus and system

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Embodiment Construction

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0039]The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and not necessarily Describe a particular order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of practice in sequences other than those illu...

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Abstract

An embodiment of the invention discloses a control method of a convertor, an apparatus and a system. The method comprises the following steps of acquiring a modulating wave; according to the modulating wave, calculating a first injection amount; carrying out size control on the first injection amount and outputting a second injection amount, wherein an absolute value of a difference value of the second injection amount and a third injection amount is less than or equal to a preset threshold; the third injection amount is the injection amount calculated at the last time; superposing the second injection amount into the modulating wave so as to obtain the controlled modulating wave; using the controlled modulating wave to carry out discontinuous pulse width modulation on the convertor. In the embodiment of the invention, the size of the injection amount is controlled so that a speed of the injection amount which is superposed to an original modulating wave is slowing down; an exciting current can be effectively reduced so that a peak value of the exciting current can be effectively reduced too; and noises are decreased.

Description

technical field [0001] The invention relates to the communication field, in particular to a control method and device for a converter. Background technique [0002] Multi-level power conversion is an important technology in the field of high-power power conversion, among which three-level conversion is the most widely used in current industrial practice. see Figure 1a , Figure 1a It is a circuit schematic diagram of a three-level magnetic coupling converter. In a three-level converter, in order to realize the power conversion between DC and AC, the power electronic switching device of the circuit can be controlled, such as an insulated gate bipolar transistor (IGBT, InsulatedGateBipolarTransistor) is turned on or off to realize sine wave pulse width modulation (SPWM, SinusoidalPulseWidthModulation), or discontinuous pulse width modulation (DPWM, DiscontinuousPulseWidthModulation). [0003] can also refer to Figure 1b , Figure 1b is a schematic diagram of SPWM modulati...

Claims

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Application Information

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IPC IPC(8): H02M7/537
Inventor 辛凯史晏君许富强
Owner HUAWEI DIGITAL POWER TECH CO LTD
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