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Multi-level NPC converter control method and device

A converter, multi-level technology, applied in the field of electronics, can solve problems such as uneven charging and discharging of capacitors, damage to power devices, and influence on the quality of output voltage waveforms, and achieve the effects of fast adjustment speed and simple calculation process.

Active Publication Date: 2022-08-05
BEIJING SOARING ELECTRIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the use of multi-level NPC converters, due to uneven charging and discharging of capacitors, there is a problem of unbalanced midpoint potential
If it is not controlled, the waveform quality of the output voltage will be greatly affected, and in severe cases, it may cause damage to the power device

Method used

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Embodiment Construction

[0042] To help better understand the solutions provided by the embodiments of the present application, before introducing the methods provided by the embodiments of the present application, an application scenario of the solutions provided by the embodiments of the present application is introduced.

[0043] In medium and high voltage applications, compared with traditional two-level converters, multi-level converters have better output voltage and current quality at the same switching frequency, and the voltage and output voltage of each switch tube are significantly reduced. small, so it is widely used. The three-level neutral-point-clamped (NPC) converter in multi-level converters is a commonly used topology of multi-level converters, and has been used in wind power generation, photovoltaic power generation, Locomotive traction and other fields have been applied.

[0044] When the multi-level NPC converter adopts sinusoidal pulse-width modulation (.SPWM) strategy and tradi...

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Abstract

The invention discloses a multi-level NPC converter control method and device, and the method comprises the steps: injecting a target output voltage into third harmonics, and obtaining a first modulation wave of the target output voltage; determining a harmonic injection direction according to the target output voltage and the measured output current; obtaining a midpoint harmonic factor according to the harmonic injection direction and the unbalance balance factor; the value of the unbalance balance factor is determined by the target output voltage and the direct-current bus voltage, the direct-current upper half bus voltage and the direct-current lower half bus voltage of the NPC converter; the harmonic injection direction indicates the direction of a midpoint harmonic factor; injecting a midpoint harmonic factor into the first modulated wave to obtain a second modulated wave; and comparing the second modulated wave with the carrier wave to obtain a switching sequence of a switching tube in the NPC converter. The method provided by the invention only needs to calculate the harmonic injection direction and calculate the midpoint harmonic factor according to the unbalance balance factor, so that the whole calculation process is simple, and the adjustment speed is high.

Description

technical field [0001] The present application relates to the field of electronics, and in particular, to a method and device for controlling a multilevel NPC converter. Background technique [0002] Compared with the traditional two-level converter, the multi-level converter has better output voltage and current quality at the same switching frequency, and the voltage and output voltage of each switch tube are significantly reduced, so the Wide range of applications. The three-level neutral-point-clamped (NPC) converter in multi-level converters is a commonly used topology of multi-level converters, and has been used in wind power generation, photovoltaic power generation, Locomotive traction and other fields have been applied. [0003] In the process of using the multi-level NPC converter, due to the uneven charging and discharging of the capacitor, there is a problem of unbalanced mid-point potential. If it is not controlled, the waveform quality of the output voltage ...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M1/14H02M1/00
CPCH02M7/483H02M1/14H02M1/0003Y02E10/56
Inventor 王仕城徐正国范科
Owner BEIJING SOARING ELECTRIC TECH
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