Detection and identification of multiple IGBT open‐circuit faults in PWM inverters for AC machine drives

Abstract

This study proposes a new scheme for online detection and identification of single and multiple insulated-gate bipolar transistor (IGBT) open-circuit faults in three-phase pulse-width modulation (PWM) inverters of AC machine drives, which is based on Park's vector of machine phase currents. First, the switch open-circuit faults are detected by monitoring dwell times of the vector of the actual phase currents expressed in the stationary reference frame in each sector, where the normalisation of the current to its reference value is utilised, by which the immunity to the false alarms in transient conditions is improved significantly. Then, the IGBT open-circuit faults are identified, where leg open-circuit conditions are in the first place determined based on the average values of the normalised line-to-line currents. Next, the single open-circuit IGBT is located from the polarity of the corresponding phase current. By the proposed diagnosis method, the fault detection time is at the longest about 52.3 and 54% of a fundamental period in the simulation and experimental tests, respectively, and the 27 possible cases of IGBT open-circuit faults combined for all IGBTs in the inverter can be identified. In addition, this algorithm can be implemented without any additional hardware and computational burden.

Adaptive Minimum-Entropy Hybrid Compensation for Compound Faults of Non-Gaussian Stochastic Systems

“…This indicates that the estimation error (28) is stable when compound faults exist in the systems (4) and (5).…”

“…. The model does not change after the state transition, so the systems (4) to (5) and 18are equivalent.…”

“…Multiple or compound faults are different types of faults occurring simultaneo4usly, or the same fault occurring simultaneously at different internal locations [5], [6]. It is difficult…”

A hybrid diagnosis method for inverter open-circuit faults in PMSM drives

“…Therefore, protective circuits are required for quick response, or short-circuit can be converted to open-circuit by thermo-fuse [2]. Conversely, open-circuit will not cause an immediate shutdown, but the current imbalance and torque ripple caused by faults will lead to secondary damage [3].…”

Diagnosis method for open‐circuit faults of six‐phase permanent magnet synchronous motor drive system

“…Six‐phase permanent magnet synchronous motor (PMSM) is widely used in aircraft, automobile and other new energy products in recent years due to its better fault tolerance capability and lower torque pulsations [1–5]. Compared with the traditional power system, the electric drive system has many advantages, such as simple structure, fast power response and quietness [6–8]. The purpose of the drive system's fault diagnosis is to more accurately and more efficiently reflect the fault‐tolerant performance of multiphase PMSM [9].…”