A Harmonic Voltage Injection Based DC-Link Imbalance Compensation Technique for Single-Phase Three-Level Neutral-Point-Clamped (NPC) Inverters

Kyoung-Pil Kang, Younghoon Cho, Myung-Hyo Ryu and Ju-Won Baek
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Kyoung-Pil Kang: Department of Electrical Engineering, Konkuk University, Seoul 05029, Korea
Younghoon Cho: Department of Electrical Engineering, Konkuk University, Seoul 05029, Korea
Myung-Hyo Ryu: Industry Application Research Laboratory, Korea Electrotechnology Research Institute, Changwon 123456, Korea
Ju-Won Baek: Industry Application Research Laboratory, Korea Electrotechnology Research Institute, Changwon 123456, Korea

Energies, 2018, vol. 11, issue 7, 1-15

Abstract: In three-level neutral-point-clamped (NPC) inverters, the voltage imbalance problem between the upper and lower dc-link capacitors is one of the major concerns. This paper proposed a dc-link capacitor voltage balancing method where a common offset voltage was injected. The offset voltage consists of harmonic components and a voltage difference between the upper and the lower capacitors. Here, both the second-order harmonics and the half-wave of the second-order component were injected to compensate for the unbalanced voltage between the capacitors. In order to show the effectiveness of the proposed voltage injection, the theoretical analyses, simulations, and experimental results are provided. Since the proposed method does not require any hardware modifications, it can be easily adapted. Both the simulations and the experiments validated that the voltage difference of the dc-link could be effectively reduced with the proposed method.

Keywords: neutral-point-clamped (NPC) inverter; dc-link capacitor voltage balance; offset voltage injection; harmonic component (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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