A Method to Compensate the Distorted Space Vectors in the Unbalanced Neutral Point Voltage of 3-level NPC PWM Inverters

Seung-Wook Hyun; Seok-Jin Hong; Jung-Hyo Lee; Chun-Bok Lee; Chung-Yuen Won

A Method to Compensate the Distorted Space Vectors in the Unbalanced Neutral Point Voltage of 3-level NPC PWM Inverters

Vol. 16, No. 2, pp. 455-463, Mar. 2016

10.6113/JPE.2016.16.2.455

Neutral point voltage

NPC inverter

Space vector

Unbalance

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Abstract

This paper proposes a compensation method to improve the distorted space vectors when a 3-level Neutral Point Clamped (NPC) inverter has an unbalanced neutral point voltage. Since both the neutral point voltage of the DC link and the space vector of a 3-level NPC inverter are closely related depending on the output load connecting state, a distorted space vector can occur when the neutral point voltage of a 3-level NPC inverter is unbalanced. The proposed method can improve the distorted space vectors by adjusting the injection time of the small and medium vectors and by modulating the amplitude of the carrier waveforms. In this paper, the proposed method is verified by both simulation and experimental results based on a 3-level NPC inverter.

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Cite this article

[IEEE Style]

S. Hyun, S. Hong, J. Lee, C. Lee, C. Won, "A Method to Compensate the Distorted Space Vectors in the Unbalanced Neutral Point Voltage of 3-level NPC PWM Inverters," Journal of Power Electronics, vol. 16, no. 2, pp. 455-463, 2016. DOI: 10.6113/JPE.2016.16.2.455.

[ACM Style]

Seung-Wook Hyun, Seok-Jin Hong, Jung-Hyo Lee, Chun-Bok Lee, and Chung-Yuen Won. 2016. A Method to Compensate the Distorted Space Vectors in the Unbalanced Neutral Point Voltage of 3-level NPC PWM Inverters. Journal of Power Electronics, 16, 2, (2016), 455-463. DOI: 10.6113/JPE.2016.16.2.455.