Switch Open-Fault Detection for a Three-Phase Hybrid Active Neutral-Point-Clamped Rectifier

Abstract

This paper proposes a fault-detection method for open-switch failures in hybrid active neutral-point-clamped (HANPC) rectifiers. The basic HANPC topology comprises two SiC-based metal-oxide-semiconductor field-effect transistors (MOSFETs) and four Si insulated-gate bipolar transistors (IGBTs). A three-phase rectifier system using the HANPC topology can produce higher efficiency and lower current harmonics. An open-switch fault in a HANPC rectifier can be a MOSFET or IGBT fault. In this work, faulty cases of six different switches are analyzed based on the current distortion in the stationary reference frame. Open faults in MOSFET switches cause immediate and remarkable current distortions, whereas, open faults in IGBT switches are difficult to detect using conventional methods. To detect an IGBT fault, the proposed detection method utilizes some of the reactive power in a certain period to make an important difference, using the direct-quadrant (dq)-axis current information derived from the three-phase current. Thus, the proposed detection method is based on three-phase current measurements and does not use additional hardware. By analyzing the individual characteristics of each switch failure, the failed switch can be located exactly. The effectiveness and feasibility of the proposed fault-detection method are verified through PSIM simulations and experimental results.

A Simple Virtual-Vector-Based PWM Formulation for Multilevel Three-Phase Neutral-Point-Clamped DC–AC Converters including the Overmodulation Region

“…These topologies can be broadly classified in the cascaded H-bridge, flying capacitors, and neutral-point-clamped (NPC) families. Among them, the NPC family is of special interest because it offers the greatest potential to maximize power density [8][9][10][11][12][13][14][15], since the converter legs, functionally equivalent to a single-pole multiplethrow switch, are configured only with a combination of semiconductor devices, without any capacitors, inductors, or transformers, which are otherwise needed in other converter families. Then, a single set of series-connected capacitors forms the common DC-link for all legs.…”

An Overview on Fault Management for Electric Vehicle Onboard Chargers

“…Particular electronic configurations or topologies of PECs can be used in the OBCs for EVs, HEVs, and PHEVs. Those configurations include many electric and electronic components, but power semiconductors are considered the weakest and most fragile parts [2]. Power metal-oxide field-effect transistors (MOSFETs) are standard power semiconductors in various applications, including OBCs.…”