High quality modulation technology without narrow pulse for three level ultra-low frequency transmitter

doi:10.3785/j.issn.1008-973X.2025.02.020

Journal of ZheJiang University (Engineering Science)

2025, Vol. 59

Issue (2): 423-432 DOI: 10.3785/j.issn.1008-973X.2025.02.020

High quality modulation technology without narrow pulse for three level ultra-low frequency transmitter

Guopeng ZHANG1,2(

),Yuan MA1,2,*(

),Haijun TAO1,Xingguo TAN1,Zhuo CHEN3

1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China
2. Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, Jiaozuo 454003, China
3. Research Department of Renewable Generation System, Institute of Electrical Engineering of the Chinese Academy of Sciences, Beijing 100190, China

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Abstract

The influence of modulation ratio, carrier frequency, and dead time on narrow pulses was analyzed aiming at the narrow pulse problem of single-phase midpoint clamp type (NPC) three-level ultra-low frequency digital transmitter. The distribution law of narrow pulses in NPC three-level transmitter was obtained. A high-frequency inverse modulation method without narrow pulses was proposed, which eliminated the narrow pulses near the modulation peaks, valleys, and zero crossings. The digital implementation of the method and the waveform distortion issues caused by modulation peaks, valleys, and near zero crossings were explored. A three beat carrier prediction method was proposed to solve the harmonic problem caused by narrow pulse elimination strategy, and the output waveform quality without narrow pulse modulation was ensured. The proposed method was validated for eliminating narrow pulses during high-frequency modulation on the constructed experimental platform. The waveform quality near the current zero crossing was improved by three beat carrier prediction, and traditional narrow pulse elimination modulation methods were added for comparative experiments. The proposed strategy can significantly improve the waveform quality of the inverted modulation output at different modulation ratios and carrier frequencies.

Key words： three level single-phase inverter ultra-low frequency narrow pulse waveform quality high-frequency inverse

Received: 15 December 2023 Published: 11 February 2025

CLC:

TM 919

Fund: 国家自然科学基金资助项目（52267018）；河南省高校基本科研业务费专项资金资助项目（NSFRF210423）.

Corresponding Authors: Yuan MA E-mail: hpoyz@163.com;862168095@qq.com

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Cite this article:

Guopeng ZHANG,Yuan MA,Haijun TAO,Xingguo TAN,Zhuo CHEN. High quality modulation technology without narrow pulse for three level ultra-low frequency transmitter. Journal of ZheJiang University (Engineering Science), 2025, 59(2): 423-432.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2025.02.020 OR https://www.zjujournals.com/eng/Y2025/V59/I2/423

三电平特低频发射机无窄脉冲高质量调制技术

针对单相中点钳位型（NPC）三电平特低频数字发射机的窄脉冲问题，分析调制比、载波频率和死区时间对窄脉冲的影响，得到NPC三电平发射机窄脉冲的分布规律. 提出无窄脉冲的高频逆变调制方法，消除了调制波峰、谷值及过零点附近的窄脉冲. 探讨该方法的数字化实现以及该方法导致的调制波峰谷值和过零点附近的波形畸变问题，提出三拍载波的预测方法，解决了窄脉冲消除策略导致的谐波问题，保障了无窄脉冲调制的输出波形质量. 在搭建的实验平台上，验证了所提方法在高频调制过程中对窄脉冲的消除. 三拍载波预测改善了调制在电流过零点附近的波形质量，加入了传统窄脉冲消除的调制方法，进行对比实验. 所提策略在不同的调制比和载波频率下均可以大幅提升逆变调制输出的波形质量.

关键词： 三电平, 单相逆变器, 特低频, 窄脉冲, 波形质量, 高频逆变

Fig.1 Topology diagram of single-phase NPC three-level inverter

Fig.2 Carrier in-phase stacked modulation

Fig.3 Original control signal generation diagram of S_a3

Tab.1 Condition for narrow pulse generation in carrier in-phase stacked modulation

Fig.4 Control signals with dead time incorporated

Tab.2 Narrow pulse occurrence condition in carrier in-phase stacked modulation with dead time insertion

Fig.5 Narrow pulse-free modulation strategy

Fig.6 Digital implementation diagram of narrow pulse-free modulation

Fig.7 Schematic diagram of in-phase carrier digital modulation

Fig.8 Zero-crossing narrow pulse zone carrier strategy

Tab.3 Crossing determination of narrow pulse zone

Tab.4 Crossing determination of top and bottom narrow pulse zone

Fig.9 Experimental platform of single-phase NPC three-level inverter　　　　　

Tab.5 Parameter of inverter

Fig.10 Comparison diagram of driving signal in narrow pulse region of S_a1, S_a2 and S_a3

Fig.11 Comparison of output waveform of M = 0.9 inverter

Fig.12 Comparison of output waveform of M = 0.3 inverter

Fig.13 THD comparison curve between i_o and modulation index

Fig.14 THD comparison curve of i_o and carrier frequency

Fig.15 THD comparison curve of i_o at various modulation wave frequency


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