Improved NP-SVM suitable for multi-sampling used in high power NPC rectifiers without even order harmonics

Tan, Longcheng; Yin, Zhenggang; Lv, Xiaomei; Tan, Kai Meng; Zhang, Shutian; Liu, Congwei; Ge, Qiongxuan; Li, Yaohua

doi:10.1109/iciea.2010.5515361

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…A typical neutral‐point diode clamped rectifier as widely used in industries may produce even harmonic current too due to mechanism of its switching pulses are in asymmetrical pattern (improperly tuned condition) [4, 5].…”

Section: Even Harmonic Sourcesmentioning

confidence: 99%

“…Meanwhile, European Norm 50160 defines that the second harmonic voltage must be maintained <2% [1]. However, the second harmonic of higher than 3% may occur due to possible faults in some of electrical and electronic devices and operations, as further to be elaborated later [2, 4–6]. Therefore, as not widely explored, the second harmonic should be given significant consideration for further investigation in any research work.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of severity of voltage flicker caused by second harmonic

Goh

Radzi

Hizam

et al. 2017

IET Science, Measurement & Technology

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Second harmonic produces asymmetrical waveform which leads to fluctuation of root-meanssquare (rms) value with certain frequency. Meanwhile, function of weighting filter in flickermeter is designed for sixth-order low-pass filtering function with frequency to be limited to 35 Hz, signal with frequency ranging from 35 to 100 Hz, at certain gain, still can pass through. Since the second harmonic produces fluctuation of rms value with 50 Hz, there is high possibility that it can be passed by this filter and thus resulting in flicker detection. Therefore, this study points out a worthwhile research gap to justify that the presence of the second harmonic can directly increase severity of voltage flicker. In addition, further simulation work using semi-converter has been carried out, as one of main even harmonic sources, in order to justify the concept. To practically validate the concept, Fluke power analyser 435 series II and programmable alternative current source are utilised in the experimental setup. In the main finding, it is confirmed that severity of the voltage flicker increases directly with the presence of the second harmonic and it also formed a clear relationship between short-term perceptibility (Pst) and percentage of the second harmonic component.

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Section: Even Harmonic Sourcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of severity of voltage flicker caused by second harmonic

Goh

Radzi

Hizam

et al. 2017

IET Science, Measurement & Technology

View full text Add to dashboard Cite

show abstract

A THD Optimization Control for High frequency Full-SiC PWM Rectifier based on Multi-resolution Algorithm

Yan

Zhao

et al. 2020

2020 IEEE Applied Power Electronics Conference and Exposition (APEC)

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The improved voltage balancing control for high power three-level NPC rectifiers under standby and light load conditions

Tan

Liu

et al. 2011

2011 International Conference on Electrical Machines and Systems

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The voltage balancing control (VBC) ability of the three-level neutral point clamped (NPC) rectifier under standby and light load conditions is weakened because the phase current direction changes very quickly and the self-balancing ability of conventional space vector modulation (SVM) is not ensured. In order to improve the VBC ability, current prediction method together with the multi-sampling technique is proposed to obtain the current polarity information of next PWM carrier period so as to regulate the time assignment of small vectors correctly. Meanwhile, in order to improve the self-balancing ability of SVM for relieving the burden of VBC, the synchronized NP-SVM is adopted and one synchronization method is proposed in this paper. All these analyses and the effectiveness of the proposed method are firstly verified by simulation results, and are validated further in a 75kVA laboratory prototype.

show abstract

Improved NP-SVM suitable for multi-sampling used in high power NPC rectifiers without even order harmonics

Cited by 4 publications

References 12 publications

Investigation of severity of voltage flicker caused by second harmonic

Investigation of severity of voltage flicker caused by second harmonic

A THD Optimization Control for High frequency Full-SiC PWM Rectifier based on Multi-resolution Algorithm

The improved voltage balancing control for high power three-level NPC rectifiers under standby and light load conditions

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