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Segmented synchronous SHEPWM switching control method, medium and electronic equipment

A control method and PWM signal technology, applied in the field of converters, can solve problems such as the inability to completely eliminate narrow pulses, and achieve the effect of achieving minimum pulse width control, meeting minimum pulse width requirements, and eliminating specified order harmonics.

Active Publication Date: 2021-01-26
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Segmented synchronous modulation SHEPWM may also have narrow pulses when switching between different carrier ratios. If switching at a fixed angle, the narrow pulses can be eliminated by the above methods, but if switching at any angle, the above methods cannot be completely eliminated. narrow pulse

Method used

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  • Segmented synchronous SHEPWM switching control method, medium and electronic equipment
  • Segmented synchronous SHEPWM switching control method, medium and electronic equipment
  • Segmented synchronous SHEPWM switching control method, medium and electronic equipment

Examples

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Embodiment 1

[0043] Such as image 3 As shown, the segmented synchronous SHEPWM switching control method provided by the present embodiment includes the following steps:

[0044] Step 1, determine the proportional relationship between the minimum pulse width and the PWM cycle time.

[0045] Minimum pulse width T min Determined according to the minimum turn-on, turn-off time and dead time of high-power switching devices. The minimum turn-on and turn-off time of high-power switching devices and the corresponding dead time vary with different manufacturers, different types of high-power switching devices and actual working switching frequency and other factors. The minimum pulse width should be based on the actual working conditions of high-power switching devices Make sure. The turn-on process and turn-off process of high-power switching devices such as IGCT take a long time. For example, the minimum pulse width of the 4500V / 4000A IGCT after considering the dead time can reach 150 microse...

Embodiment 2

[0062] This embodiment provides a converter modulation method, in which the segmented synchronous SHEPWM switching control method as described in Embodiment 1 is used to switch between SHEPWM modes with different carrier ratios.

Embodiment 3

[0064] This embodiment provides a diode-clamped three-level converter, which implements switching of SHEPWM modes with different carrier ratios based on the segmented synchronous SHEPWM switching control method described in the embodiment.

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Abstract

The invention relates to a segmented synchronous SHEPWM switching control method, a medium and electronic equipment, and the method is used for controlling the switching of SHEPWM modes with differentcarrier ratios, and comprises the following steps: obtaining the ratio n of the minimum pulse width to the PWM period time; when a switching condition is met, judging whether the following two conditions are simultaneously met or not in each PWM period: A, each path of PWM signals in the first n periods is kept unchanged before switching; and B, the level output by the SHEPWM after switching is the same as the level output by the SHEPWM before switching, or all paths of PWM signals in n periods after switching are kept unchanged; if yes, completing SHEPWM switching of different carrier ratios, and if not, keeping the current carrier ratio running. Compared with the prior art, the method can effectively solve the problem of narrow pulse when SHEPWM switching of different carrier ratios isachieved at any time through segmented synchronous modulation SHEPWM.

Description

technical field [0001] The invention belongs to the application technology of power electronics, relates to the field of converters, in particular to a segmented synchronous SHEPWM switching control method, medium and electronic equipment. Background technique [0002] Diode-clamped (NPC, Neutral Point Clamped) three-level converters have the characteristics of high withstand voltage, small output voltage dv / dt, simple structure, and bidirectional flow of energy, and are widely used in railway locomotive traction and high-speed Maglev transportation field. However, in the locomotive traction field, it is generally required that the output voltage of the NPC three-level converter has a wide range of amplitude, a wide frequency range, and low harmonic content. For example, the output frequency range of the traction converter of the existing high-speed maglev train is 0-300 Hz. The switching frequency of high-power power electronic devices is relatively low, such as IGCT is se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M7/5395H02M1/12
CPCH02M1/12H02M7/487H02M7/5395
Inventor 秦峰林滢鲁涤强王霄桦金宇吴冬华姜付杰
Owner TONGJI UNIV
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