Nadeem Shahbaz - IEEE Xplore Author Profile

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This study proposed an effective machine learning (ML)-based fault diagnosis method for demagnetization faults, including “healthy, 30% unipolar demagnetization, 50% multimagnet demagnetization, 100% adjacent pole demagnetization, and 40% uniform demagnetization,” in a 25-kW permanent magnet synchronous generator (PMSG) that considers algorithm accuracy and signal processing technique efficiency, ...Show More
In wind power power systems, the reliable functioning of Permanent Magnet Synchronous Generators (PMSG) depends on condition monitoring and fault diagnosis. Using 3D simulation models, we present a diagnostic approach for identifying multiple demagnetization problems in PMSG. Specifically, we use the four states of demagnetization: healthy condition, 50% unipolar magnet breakage, 75% demagnetizati...Show More
This paper utilizes Convolutional Neural Networks (CNN) with Residual Networks (ResNet) to identify and classify demagnetization faults in images. Firstly, we collected current feature datasets corresponding to two types of permanent magnet wind turbines, namely 25 kW and 2 MW, representing the source and target domains. Using the source domain dataset, we trained a ResNet50 model specifically for...Show More
This manuscript introduces a novel diagnostic technique for identifying inter-turn short circuits in doubly-fed induction generators (DFIGs) by integrating multi-channel external magnetic field (MFL) and vibration signals. The approach begins with cepstral pre-whitening to mitigate noise and improve the identification of fault-related characteristics. Following this, a correlation analysis is cond...Show More
During the operation of the permanent magnet wind generator, electrical faults such as winding short circuit, winding open circuit, and winding asymmetry may occur, which directly affects the regular operation of the wind turbine and adversely affects wind power generation. This paper proposes an electrical fault diagnosis method for permanent magnet generators based on feature extraction and Supp...Show More
During the operation of a permanent magnet wind turbine, magnet demagnetization failure may occur, which directly affects the regular operation of the wind turbine and adversely affects wind power generation. This paper proposes a demagnetization fault diagnosis method for permanent magnet generators based on feature extraction and stacking integrated learning. A permanent magnet generator with a ...Show More
This study focuses on the detection of faults in wind turbine operations to ensure reliability, safety, and cost efficiency. It introduces a machine learning-based diagnostic approach for identifying various faults, including eccentricity faults, stator short circuits, and both damaged and aging magnets in a 25 kW Permanent Magnet Synchronous Generator (PMSG). A 2D simulation model utilizing the F...Show More
Early fault detection is critical for ensuring reliable operation in wind power generation systems employing doubly fed induction generators (DFIGs). Although the widespread use of motor current signature analysis (MCSA) for noninvasive fault detection, early-stage faults in DFIGs often present with weak characteristic fault information, posing challenges for detection amidst noise and interferenc...Show More
This manuscript presents the Magnetic Flux Leakage (MFL) theory for incipient inter-turn short circuit (ITSC) faults in the Doubly Fed Induction Generators (DFIGs), which involves the simulation and modeling of the failure mechanism, the quantitative and qualitative description analysis, the health indicator construction, and early weak fault detection and state evaluation based on MFL theory. Fir...Show More
Fault diagnosis and condition monitoring play a significant role in wind turbines as they guarantee safety and reliability and avoid perilous conditions; therefore, fault diagnosis prior to its existence saves both time and costs. This paper proposes a machine learning-based fault diagnosis technique using vibration and leakage flux for multiple demagnetization faults, including “healthy, 30% unip...Show More
Early fault detection of Doubly-fed Induction Generators (DFIG) is a key problem for reliable operation of wind power generation. Motor current signature analysis (MCSA) is the most reliable and widely used technique, gaining favor because it is non-invasive. In the initial stage of wind generator fault, the fault characteristic information is weak and easy to be covered by noise and interference ...Show More
During the operation of permanent magnet wind turbines, magnetic steel demagnetization faults may occur, directly affecting the normal operation of wind turbines and having adverse effects on wind power generation. This article proposes a demagnetization fault diagnosis method for permanent magnet generators based on feature extraction and convolutional neural network. A permanent magnet generator...Show More
The health status of the Doubly Fed Induction Generator (DFIG) is related to the actual operating conditions, the external environment, the accumulation of sudden factors, and the coupling effect. The degradation feature extraction is mainly based on a single signal or multiple statistics of a single signal. The principal component components were extracted from the end magnetic flux leakage (MFL)...Show More
Fault diagnosis before its existence and the complete shutdown is essentially critical for the whole industry. Fault diagnosis based on condition monitoring methods and artificial intelligence techniques are very potent. This paper assesses the machine-learning-based processes using air gap flux and stator current for eccentricity, magnet broken, and stator inter-turn short circuit faults in Perma...Show More