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Abstract

The neutral point clamped (NPC) three-level inverter is widely used in highvoltage and high-power applications. However, neutral point voltage oscillation (NPVO) and common-mode voltage (CMV) problems exist in the NPC three-level inverter. In this paper, an improved virtual space vector modulation (VSVM) is proposed based on the reconstruction of a virtual small vector and a virtual medium vector. Compared with the traditional VSVM, an improved VSVM can effectively reduce the CMV. On this basis, a vector conversion method is proposed to further reduce the NPVO in the whole range. Simulation results verify the effectiveness and superiority of the improved VSVM.
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Bibliography

[1] Zhang X.,Wu X., Geng C., Ping X., Chen S., Zhang H., An Improved Simplified PWM for Three-Level Neutral Point Clamped Inverter Based on Two-Level Common-Mode Voltage Reduction PWM, IEEE Trans. Power Electronics, vol. 35, no. 10, pp. 11143–11154 (2020).
[2] Kaniewski J.Z., Power flow controller based on bipolar direct PWM AC/AC converter operation with active load, Archives of Electrical Engineering, vol. 68, no. 2, pp. 341–356 (2019).
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[4] Pham K., Nguyen N., A Reduced Common-Mode-Voltage Pulsewidth Modulation Method With Output Harmonic Distortion Minimization for Three-Level Neutral-Point-Clamped Inverters, IEEE Trans. Power Electronics, vol. 35, no. 7, pp. 6944–6962 (2020).
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[7] Nguyen T.K.T., Nguyen N.-V., Prasad N.R., Eliminated common mode voltage pulse width modulation to reduce output current ripple for multilevel inverters, IEEE Trans. Power Electronics, vol. 31, no. 8, pp. 5952–5966 (2016).
[8] Lee J.S., Lee K.B., Time-Offset Injection Method for Neutral-Point AC Ripple Voltage Reduction in a Three-Level Inverter, IEEE Trans. Power Electronics, vol. 31, no. 3, pp. 1931–1941 (2016).
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[10] Chen J., He Y., Hasan S.U., Liu J., A comprehensive study on equivalent modulation waveforms of the SVM sequence for three-level inverters, IEEE Trans. Power Electronics, vol. 30, no. 12, pp. 7149–7158 (2015).
[11] Choi U.M., Lee J.S., Lee K.B., New modulation strategy to balance the neutral-point voltage for threelevel neutral-clamped inverter systems, IEEE Trans. Energy Conversion, vol. 29, no. 1, pp. 91–100 (2014). 218 Junlong Fang et al. Arch. Elect. Eng.
[12] Choi U.M., Lee K.B., Blaabjerg F., Method to minimize the low frequency neutral-point voltage oscillations with time-offset injection for neutral-point-clamped inverters, IEEE Trans. Ind. Appl., vol. 51, no. 2, pp. 1678–1691 (2015).
[13] Busquets-Monge S., Bordonau J., Boroyevich D., Somavilla S., The nearest three virtual space vector PWM – A modulation for the comprehensive neutral-point balancing in the three-level NPC inverter, IEEE Power Electron. Lett., vol. 2, no. 1, pp. 11–15 (2004).
[14] Xiang C.Q., Shu C., Han D., Improved Virtual Space Vector Modulation for Three-Level Neutral- Point-Clamped Converter with Feedback of Neutral-Point Voltage, IEEE Trans. Power Electronics, vol. 33, no. 6, pp. 5452–5464 (2018).
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[16] Yonglong Zhang, Yuejun An, Guangyu Wang, Xiangling Kong, Multi motor neural PID relative coupling speed synchronous control, Archives of Electrical Engineering, vol. 69, no. 1, pp. 57–68 (2020).
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[19] Pham K., Nguyen N., A Reduced Common-Mode-Voltage Pulsewidth Modulation Method with Output Harmonic Distortion Minimization for Three-Level Neutral-Point-Clamped Inverters, IEEE Trans. Ind. Electronics, vol. 35, no. 7, pp. 6944–6962 (2020).
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[21] Jiang W., Wang P., Ma M., A Novel Virtual Space Vector Modulation with Reduced Common-Mode Voltage and Eliminated Neutral Point Voltage Oscillation for Neutral Point Clamped Three-Level Inverter, IEEE Trans. Ind. Electronics, vol. 67, no. 2, pp. 884–894 (2020).
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Authors and Affiliations

Junlong Fang
1
ORCID: ORCID
Guangya Wang
1
Ran Li
1
Siyuan Liu
1
Shuyu Wang
1

  1. School of Electricity and Information, Northeast Agricultural University, China
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Abstract

The paper is a review of analog and digital electronics dedicated to monitor nanosecond pulses. Choosing the optimal peak detector construction depends on many factors for example precision, complexity, or costs. The work shows some virtues and limitations of selected peak detection methods, for example standard peak detector with rectifier, sample and hold circuit with triggering units and ADC fast acquisition. However, the main attention is paid to problems of results from effective triggering signal for sample and hold operation. The obtained results allow for designing a peak detector construction as an alternative for costly and very complex fast acquisition systems based on ADC and FPGA technologies.

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Authors and Affiliations

Krzysztof Achtenberg
ORCID: ORCID
Janusz Mikołajczyk
ORCID: ORCID
Dariusz Szabra
Artur Prokopiuk
Zbigniew Bielecki
ORCID: ORCID
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Abstract

Considering the problem to diagnose incipient faults in nonlinear analog circuits, a novel approach based on fractional correlation is proposed and the application of the subband Volterra series is used in this paper. Firstly, the subband Volterra series is calculated from the input and output sequences of the circuit under test (CUT). Then the fractional correlation functions between the fault-free case and the incipient faulty cases of the CUT are derived. Using the feature vectors extracted from the fractional correlation functions, the hidden Markov model (HMM) is trained. Finally, the well-trained HMM is used to accomplish the incipient fault diagnosis. The simulations illustrate the proposed method and show its effectiveness in the incipient fault recognition capability.

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Authors and Affiliations

Yong Deng
Yibing Shi
Wei Zhang

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