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http://dx.doi.org/10.6113/TKPE.2017.22.4.369

A Control Scheme for Quality Improvement of Input-Output Current of Small DC-Link Capacitor Based Three-Level NPC Inverters  

In, Hyo-Chul (Dept. of Electrical and Computer Eng., Ajou University)
Kim, Seok-Min (Dept. of Electrical and Computer Eng., Ajou University)
Park, Seong-Soo (Dept. of Space Survey Information Tech., Ajou University)
Lee, Kyo-Beum (Dept. of Electrical and Computer Eng., Ajou University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.22, no.4, 2017 , pp. 369-372 More about this Journal
Abstract
This paper presents a control scheme for three-level NPC inverters using small DC-link capacitors. To reduce the inverter system volume, the film capacitor with small capacitance is a promising candidate for the DC-link. When small capacitors are applied in a three level inverter, however, the AC ripple component increases in the DC-link NPV (neutral point voltage). In addition, the three-phase input grid currents are distorted when the DC-link capacitors are fed by diode rectifier. In this paper, the additional circuit is applied to compensate for small capacitor systems defect, and the offset voltage injection method is presented for the stabilization in NPV. These two proposed processes evidently ensure the quality improvement of the input grid currents and output load currents. The feasibility of the proposed method is verified by experimental results.
Keywords
Electrolytic capacitor-less; Neutral-point clamped inverter; Neutral-point voltage control;
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1 V. Yaramasu and B. Wu, "Predictive control of a three-level boost converter and an NPC inverter for high-power PMSG-based medium voltage wind energy conversion systems," IEEE Transactions on Power Electronics, Vol. 29, No. 10, pp. 5308-5322, Oct. 2015.   DOI
2 A. Emadi, A. Khaligh, and C. H. Rivetta, "Constant power loads and negative impedance instability in automotive systems: definition, modeling, stability, and control of power electronics converter and motor drives," IEEE Transactions on Vehicular Technology, Vol. 55, No. 4, pp. 1112-1125, Jul. 2006.   DOI
3 J. S. Lee and K. B. Lee, "Time-offset injection method for neutral-point ac ripple voltage reduction in a three-level inverter," IEEE Transactions on Power Electronics, Vol. 31, No. 3, pp. 1931-1941, Mar. 2016.   DOI
4 J. S. Lee, S. Yoo, and K. B. Lee, "Novel discontinuous PWM method of a three-level inverter for neutral-point voltage ripple reduction," IEEE Transactions on Industrial Electronics, Vol. 63, No. 6, pp. 3344-3354, Jun. 2016.   DOI
5 H. Shin, Y. Son, and J. I. Ha, "Grid current shaping method with dc-link shunt compensator for three-phase diode rectifier-fed motor drive system," IEEE Transactions on Power Electronics, Vol. 32, No. 2, pp. 1279-1288, Mar. 2016.   DOI
6 R. Maheshwari, S. Munk-Nilelsen, and S. Busquets-Monge, "Design of neutral-point voltage controller of a three-level NPC inverter with small dc-link capacitor," IEEE Transactions on Industrial Electronics, Vol. 60, No. 5, pp. 1861-1871, May 2013.   DOI