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Open AccessArticle

Design and Control of Small DC-Link Capacitor-Based Three-Level Inverter with Neutral-Point Voltage Balancing

1
Green Energy Research and Development Center, EGTRONICS Company, Innoplex B/D 502, 304 Sinwon-ro, Yeongtong-gu, Suwon 16675, Korea
2
Department of Electrical and Computer Engineering, Ajou University, 206, World cup-ro, Yeongtong-gu, Suwon 16499, Korea
*
Author to whom correspondence should be addressed.
Energies 2018, 11(6), 1435; https://doi.org/10.3390/en11061435
Received: 19 April 2018 / Revised: 23 May 2018 / Accepted: 30 May 2018 / Published: 4 June 2018
(This article belongs to the Special Issue Power Electronics 2018)
This paper presents a method to improve the quality of input-output currents in a three-level neutral-point clamped (NPC) inverter with small direct current-link (DC-link) capacitor systems. The inverter systems with the small DC-link capacitors have several advantages in terms of cost, volume, life-time, and reliability when compared to inverters that use large DC-link capacitors. However, there are problems with respect to the deterioration of the input current quality and a severe ripple of neutral-point voltage (NPV), which can cause an aggravated output current. To mitigate these issues, an additional circuit is applied for the input current shaping and a compensation algorithm is applied to reduce the ripple voltage of NPV. The effectiveness of the proposed design and control method is verified with various simulation and experimental results. View Full-Text
Keywords: electrolytic capacitor less inverter; neutral-point clamped inverter; grid current quality; carrier-based pulse-width modulation (CB-PWM) electrolytic capacitor less inverter; neutral-point clamped inverter; grid current quality; carrier-based pulse-width modulation (CB-PWM)
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MDPI and ACS Style

In, H.-C.; Kim, S.-M.; Lee, K.-B. Design and Control of Small DC-Link Capacitor-Based Three-Level Inverter with Neutral-Point Voltage Balancing. Energies 2018, 11, 1435.

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