Abstract
This paper presents an extension theory-based assessment method to perform fault diagnosis for inverters in motor driving systems. First, a three-level neutral-point clamped (NPC) inverter is created using the PSIM software package to simulate faults for any power transistor in the NPC-type inverter. Fast Fourier transformation is used to transform the line current signals in the time domain into a spectrum in the frequency domain for analysis of the corresponding spectrum of features of the inverter for faults with different power transistors. Then, the relationships between fault types and specific spectra are established as characteristics for the extension assessment method, which is then used to create a smart fault diagnosis system for inverters. Fault-tolerant control (FTC) is used here when the rated output of a faulty inverter is decreased in order to maintain balanced output in three phases by changing the framework of the transistor connection. This is performed to reinforce the reliability of the inverter. Finally, by the simulation and experimental results, the feasibility of the proposed smart fault diagnosis system is confirmed. The proposed fault diagnosis method is advantageous due to its minimal use of data and lack of a learning process, which thereby reduces the fault diagnosis time and makes the method easily used in practice. The proposed fault-tolerant control strategy allows both online and smooth switching in the wiring structure of the inverter.
Highlights
Compared to two-level inverters, multi-level inverters [1,2,3,4,5] exert less voltage stress on switches, feature smaller change rates in their output voltages, and can be applied in high power scenarios.As multi-level inverters incorporate multiple power transistors that are connected in both series and parallel, making the output line-to-ground voltage waves embedded with many step-like waveforms, their waveforms become step-like voltage waveforms which are better approximated in the form of sine waves, being suitable for reducing harmonic components.Multi-level inverters are generally divided as diode-clamped, neutral-point clamped (NPC, I-type), cascaded H-bridge (CHB), and flying capacitor inverters
These data can be used with extension theory to create an inverter fault diagnosis system for detecting faults in power semiconductor switches in the main circuits of three-level NPC inverters
This paper has presented a fault diagnosis system for inverters based on extension theory
Summary
Compared to two-level inverters, multi-level inverters [1,2,3,4,5] exert less voltage stress on switches, feature smaller change rates in their output voltages (dv/dt), and can be applied in high power scenarios. The study proposed a fault-tolerant control method to reduce the effect of the open-switch fault via compensation with a distorted reference voltage This method could be used with a three-level NPC converter, it can only be used in AC-to-DC converters, but not in inverters. This study proposes an intelligent fault-tolerant control system based on extension theory for locating faults in a three-level NPC-type inverter. Simulation experimental are used to prove the feasibility of theFinally, method.in Section 6, faulttolerant control in the event of power switch failure in the three-level NPC-type inverter is analyzed, 2. Considering research on inverter fault diagnosis, this paper targets a three-level NPC inverter as
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