Grid harmonics compensation by using high-power PWM converters based on combination approach

For high-power PWM converters, selective harmonic elimination (SHE) modulation scheme is commonly adopted to reduce the low-order harmonics caused by low switching frequency. However, the SHE scheme itself lacks the capability to actively compensate the grid background harmonics. To enable the activ...

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Bibliographic Details
Main Authors: Ye Zhang, Yun Wei Li
Format: Conference Proceeding
Language:English
Subjects:
current-source rectifier
Harmonic analysis
harmonic compensation
high-power converter
Power harmonic filters
Pulse width modulation
Pulse width modulation converters
selective harmonic elimination
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Summary:For high-power PWM converters, selective harmonic elimination (SHE) modulation scheme is commonly adopted to reduce the low-order harmonics caused by low switching frequency. However, the SHE scheme itself lacks the capability to actively compensate the grid background harmonics. To enable the active compensation ability of the SHE-modulated PWM converters, a selective harmonic compensation (SHC) scheme and an SHE phase jittering method have been proposed in previous works, and their effectiveness to actively attenuate one grid line current harmonic were verified on a high-power PWM current-source rectifier (CSR) system application. Nevertheless, both of the two methods have difficulty in compensating two harmonics simultaneously, which limits their applications with a low resonant frequency of converter system's filter circuit. This paper extends the previous studies to enable the high-power PWM converters to actively compensate two grid background harmonics. The proposed method can not only further reduce the grid line current distortion, but also makes the application of the active compensation no longer limited by the filter circuit. Experimental results of its application on a high-power PWM CSR system are provided to verify the effectiveness.
ISSN:2329-3721
2329-3748
DOI:10.1109/ECCE.2015.7310560