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svpwm modulation method for t-type npc converter

A modulation method and converter technology, which are applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., to avoid sudden changes in modulation voltage and reduce harmonic content.

Inactive Publication Date: 2019-09-03
北京科诺伟业科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to address the shortcomings of the existing NPC three-level converter midpoint potential control method, and propose a SVPWM modulation method with midpoint potential control for T-type NPC converters

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] The hardware structure of the T-type NPC converter applying the present invention is as follows: image 3 shown, including: DC voltage source U dc , Upper busbar DC voltage divider capacitor C p , Lower busbar DC voltage divider capacitor C n , T-type power unit, filter LC and grid voltage source U g . The T-shaped power unit consists of 12 fully-controlled switching devices S 11 -S 34 composition. The DC voltage source U dc The positive pole of the upper bus is connected to the DC voltage dividing capacitor C p , DC voltage source U dc The negative pole of the lower bus is connected to the DC voltage dividing capacitor C n , through the upper bus DC voltage divider capacitor C p and lower busbar DC voltage divider capacitor C n The DC voltage is equally divided into two parts, with the midpoint N as the zero potential, and t...

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Abstract

According to a space vector pulse width modulation (SVPWM) method for a T-type NPC converter, a switch state within an arbitrary period is directly analyzed from a starting point of a three-phase modulation voltage, an allocation ratio and a compensation direction are determined according to amplitude and direction of difference between a positive bus voltage and a negative bus voltage and a current direction of maximum phase of an absolute value of the modulation voltage, and thus, a small vector is visually allocated again. The allocation proportion of the small vector is relevant to midpoint potential difference amplitude, a proportion regulator is used for regulation, the abrupt change of the modulation voltage caused by Bang-Bang control of a midpoint potential is prevented, and the harmonic content is reduced.

Description

technical field [0001] The invention relates to a modulation method of a T-shaped NPC converter. Background technique [0002] As a key component of the energy storage system, the energy storage converter plays the role of connecting the battery and the grid. Its main function is to realize the charging and discharging of the battery, the bidirectional flow of energy and the switching of on-grid and off-grid operation modes. [0003] Compared with the two-level circuit, the three-level circuit has the following advantages: the output voltage waveform is multi-level, the harmonic is small, and the required filter inductance is small, which is beneficial to reduce the system cost and loss; the switching loss is small and the efficiency is high; The voltage change rate is small during the switching action, and the EMI caused by the switch is small. [0004] Compared with other three-level circuits, the T-type NPC converter has the characteristics of low loss and high efficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/758
Inventor 王琳许洪华
Owner 北京科诺伟业科技股份有限公司
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