Open-Switch Fault Diagnosis Algorithm and Tolerant Control Method of the Three-Phase Three-Level NPC Active Rectifier
- Resource Type
- article
- Authors
- Jun-Hyung Jung; Hyun-Keun Ku; Yung-Deug Son; Jang-Mok Kim
- Source
- Energies, Vol 12, Iss 13, p 2495 (2019)
- Subject
- three-level neutral-point clamped (NPC) active rectifier
open-switch fault
fault diagnosis and tolerant control method
space vector modulation (SVM)
Technology
- Language
- English
- ISSN
- 1996-1073
This paper proposes a fault diagnosis and tolerant control methods for an open-switch fault caused in a three-phase three-level neutral-point-clamped (NPC) pulse-width modulation (PWM) active rectifier. The open-switch fault in the three-level NPC active rectifier causes a distortion in the input phase current and a ripple in the DC-link capacitor voltage. Therefore, proper fault diagnosis and tolerant control methods are required to prevent additional failures and performance degradation in the rectifier system. This paper conducted a detailed analysis of the effect of the single open-switch fault on the NPC PWM active rectifier and proposed a fault diagnosis method utilizing the DC link voltage and the phase angle of the input grid voltage. Furthermore, this paper proposes a fault-tolerant control method to reduce the effect of the open-switch fault by compensating a distorted reference voltage. The effectiveness of the proposed fault diagnosis and tolerant control methods are verified through experimental results.