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PWM narrow pulse elimination method and single-phase and three-phase PWM narrow pulse elimination device

A narrow pulse and pulse technology, applied in the field of single-phase and three-phase PWM narrow pulse elimination devices, can solve the problems affecting control accuracy and smooth performance, and achieve the effect of ensuring the linear adjustment range, reducing loss and prolonging service life.

Pending Publication Date: 2022-01-21
SHANGHAI ELECTRIC WIND POWER GRP CO LTD +1
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Problems solved by technology

However, while deleting narrow pulses, it will affect the control accuracy and smoothing performance

Method used

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  • PWM narrow pulse elimination method and single-phase and three-phase PWM narrow pulse elimination device
  • PWM narrow pulse elimination method and single-phase and three-phase PWM narrow pulse elimination device
  • PWM narrow pulse elimination method and single-phase and three-phase PWM narrow pulse elimination device

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Embodiment Construction

[0024] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.

[0025] The terminology used in this application is for the purpose of describing particular embodiments only, and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term...

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Abstract

The invention provides a PWM narrow pulse elimination method and a single-phase and three-phase PWM narrow pulse elimination device. The method comprises the following steps: S11, obtaining carrier data; S12, processing the carrier data based on a triangular wave periodic signal and the dead time of an upper power tube and a lower power tube to obtain PWM data of the upper power tube and the lower power tube; S13, according to the PWM data of the upper power tube and the lower power tube, determining whether narrow pulses with the pulse width smaller than the minimum pulse width exist in the PWM data of the upper power tube and / or the lower power tube or not; and S14, if YES, deleting the narrow pulse or compensating the pulse width of the narrow pulse according to the position of the narrow pulse in the current working clock period of the triangular wave periodic signal. The influence caused by eliminating the narrow pulse is compensated, the influence of eliminating the narrow pulse on the control performance is reduced, the control error caused by eliminating the narrow pulse is reduced, and output ripples is reduced.

Description

technical field [0001] The present application relates to the technical field of wind power, in particular to a PWM narrow pulse elimination method and a single-phase and three-phase PWM narrow pulse elimination device. Background technique [0002] In the converter of the wind turbine, the PWM drive of the power device is directly related to the energy conversion and transmission. For example, the narrow pulse in the PWM signal cannot make the converter power tube IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor ) is completely turned on or off, resulting in excessive peak voltage when the IGBT is turned off, and at the same time, the switching loss will also increase, which directly affects the service life and loss of the power device. [0003] By deleting the narrow pulse whose pulse width is less than the set value, the impact of incomplete turn-on and turn-off on the power device can be well reduced. However, while deleting narrow pulses, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M1/088
CPCH02M1/08H02M1/088
Inventor 付厚刘嘉明吴立建方杭杭田超李爽张鲁华
Owner SHANGHAI ELECTRIC WIND POWER GRP CO LTD
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