Research on High-Frequency Isolated NPC Three-Level Inverter for Frequency Conversion and Speed Regulation

Mining frequency converters are the primary means for achieving variable frequency speed regulation of electromechanical equipment in coal mines, offering energy-saving benefits for coal mining enterprises. The common power supply method involves converting high voltage to low voltage using power fr...

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Bibliographic Details
Published inApplied sciences Vol. 14; no. 21; p. 9673
Main Authors Wang, Yiying, Gao, Longyu, Ma, Lifen, Liu, Yang, Wu, Yanhui, Dai, Jikun
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 23.10.2024
Subjects
Coal mining
Diodes
Efficiency
Energy
Mines
Quality management
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Summary:Mining frequency converters are the primary means for achieving variable frequency speed regulation of electromechanical equipment in coal mines, offering energy-saving benefits for coal mining enterprises. The common power supply method involves converting high voltage to low voltage using power frequency transformers before supplying equipment. However, this integration of power frequency transformers with supply devices occupies significant space, making it unsuitable for confined underground environments. Additionally, they suffer from poor output waveform quality and high harmonic content. To tackle these challenges, this paper presents a three-stage topology for high-frequency isolated frequency conversion and speed regulation, utilizing three-phase uncontrolled rectification, a single active isolated DC/DC converter, and an NPC three-level inverter. The control strategies for each stage are discussed in detail. Simulations and experimental results confirm the validity and feasibility of the proposed design, demonstrating enhanced stability and dynamic performance of the three-stage high-frequency isolated frequency converter.
ISSN:2076-3417
2076-3417
DOI:10.3390/app14219673