Converter with reduced harmonic waves

A converter and filter technology, applied in the field of converters, can solve the problems of weak filter attenuation and filter loss increase

Active Publication Date: 2009-08-19
SIEMENS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, the filter is only weakly attenuated because the losses in the filter rise with attenuation

Method used

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  • Converter with reduced harmonic waves
  • Converter with reduced harmonic waves
  • Converter with reduced harmonic waves

Examples

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Embodiment Construction

[0039] figure 1 Shown is a schematic diagram of a converter. The converter is connected at a grid voltage of U N on the grid. The converter has a rectifier 3 connected to a grid, the rectifier 3 is connected to the AC voltage U of the grid N are rectified and delivered to an intermediate circuit voltage U Z on the intermediate circuit. Intermediate circuit voltage U Z by a capacitor C Z to filter. The intermediate circuit is also connected to a three-phase inverter 2, which uses the intermediate circuit voltage U Z Generates motor voltage. The inverter is connected to the electric motor 5 via a filter 1 .

[0040] In addition, an analog and / or digital control unit 4 is provided, which controls the inverter 2 to generate an effective AC voltage U for the electric motor R * , U S * and U T * . except a control signal U * In addition, the control unit 4 can also measure the signal (such as speed n or effective AC current I R , I S or I T ) for processing. In ...

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Abstract

Converter and method for controlling a converter with power semiconductor switches, having a filter (1) which is connected to the power semiconductor switches and having a drive circuit (4) which is connected to the power semiconductor switches for the purpose of modulation, wherein, as a result of the modulation, a fundamental at a fundamental frequency (fGS) is generated in a passband (P) of the filter (1), modulation products are generated in a first frequency band (FB1), in a second frequency band (FB2) and in an intermediate frequency band (ZFB) which is formed between the first frequency band (FB1) and the second frequency band (FB2), the modulation products in the intermediate frequency band (ZFB) are reduced in comparison with the modulation products in the first frequency band (FB1) and the modulation products in the second frequency band (FB2), and the intermediate frequency band (ZFB) is generated, in a resonant range (R) of a resonant frequency (fres) of the filter (1), between the passband (P) and an attenuation range (D) of the filter (1). A converter having an output-side sinusoidal filter whose dimensions have been reduced is thus obtained.

Description

technical field [0001] The invention relates to a converter and a method of controlling a converter. Background technique [0002] High-speed synchronous motors still require a power frequency of 1000 Hz and above even in the case of a two-pole design. In this case, for example, two-phase or three-phase pulse-controlled inverters with pressurization function are used as power supply units, such pulse-controlled inverters operate according to the subharmonic method, for example. [0003] When performing space vector modulation or modulation with the aid of a triangular carrier signal (subharmonic method), in addition to the expected fundamental wave, the supplied voltage also contains the frequency f a =μf schalt ±ηf GS harmonics. Among them, f GS is the frequency of the fundamental wave, f schalt Is the pulse frequency, μ, η are positive integer ordinal numbers. The frequency of the part of the output voltage that is generated based on the modulation as a supplement t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12
CPCH02M1/12H02M1/126
Inventor 弗朗茨·鲍尔克里斯托夫·布鲁诺特克莱门斯·卡伦汉斯·蒂施曼彻
Owner SIEMENS AG
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