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Aluminum electrolytic capacitors (AECs) are the most common capacitors used in power electronics. They are frequently used for filtering and storage functions because of their small size, large capacitance and low price. However, AECs also represent the major cause for power electronics equipment breakdown, mainly due to their wear out through the vaporization of the electrolyte, as a result of both...
Fault detection and fault accommodation as well as fault tolerance are important issues in closed-loop controlled three-phase converters. For such systems, power semiconductors and sensors are the most affected components by the occurrence of failures. Therefore, fault diagnosis and remedial operating strategies involving such components are highly required. In this work we propose a new reliable...
Although induction motors are robust devices, faults may appear and so reliable and stable operation is required. More aspects need to be addressed nowadays in terms of condition monitoring. It is necessary to extract as much information as possible related to the overall motor condition and health. Also, different levels of diagnosis are required, as well necessity of detecting the fault level severity...
The reliable diagnostic of non-adjacent rotor bar breakages in induction motors based on the analysis of currents is still an unsolved industrial problem. The traditional MCSA has not proven to be robust enough for assessing the rotor condition under this situation; this is due to the fact that the joint effect of breakages located at certain relative positions can be subtractive rather than additive,...
This paper presents a comparison of two of the most sensitive methods to detect low-level turn-to-turn faults in the windings of three-phase transformers. The performance of the negative sequence component and of the space vector protection algorithms is tested under several internal and/or external fault conditions. The simulation results indicate that the fault detection sensitivity of both methods...
Induction motors airgap-eccentricity fault detection has attracted the interest of many researchers in last decades. The Discrete Fourier Transform (DFT) has been widely used for that purpose. However, DFT can only give meaningful information for stationary signals. In this paper, an efficient time-domain technique based on a modified Prony's method for the airgap-eccentricity fault detection in induction...
A new fault diagnostic method is presented in this paper for bidirectional half-bridge DC-DC converters. This algorithm uses only the converter control variables without requiring extra-sensors and its implementation requires only a minimum computational effort. Simulation results in a wind power system including supercapacitors and batteries have been used to validate the fault diagnostic method...
The aim of this paper is to study the influence of the drive train topology on the temperature of the different components in permanent magnet synchronous motor (PMSM) drives applied to electric/hybrid vehicles. The temperature is a critical parameter because it is directly related to the lifetime and reliability of a device. This is particular important for PMSMs since it also influences the magnetic...
Non-isolated DC-DC converters are the most simple and common power converter topologies and their reliability is of primary importance in many safety critical applications. Therefore, a new fault diagnostic method is presented in this paper for unidirectional non-isolated DC-DC converters using only the converters control variables without requiring extrasensors and with only a minimum computational...
This paper proposes a small-scale standalone wind power system for rural and remote areas electrification. The presented system is composed of a wind turbine, a permanent magnet synchronous generator (PMSG), a diode bridge rectifier, two buck converters (one for optimizing the wind power system generation and the other to satisfy load electrical requirements), a battery bank, and a variable load....
The correct modeling and control of synchronous reluctance motors (SynRMs) requires a very good parameter identification. Accordingly, a simple experimental off-line approach for the calculation of the viscous friction coefficient, constant friction load, iron loss resistance and direct/quadrature inductances is presented in this paper. The iron loss resistance and the direct/quadrature inductances...
Energy storage systems are mandatory in renewable energy based power supplies. They work as both an energy buffer and a backup. Regarding the renewable energy sources intermittent behavior and the load profile, high energy and power density are important requirements. To achieve both, this paper presents a modular design of a hybrid storage system including supercapacitors and batteries, benefiting...
This paper deals with a new on-line diagnostic scheme based on the use of the stator instantaneous complex apparent impedance signature analysis for stator winding inter-turn short-circuit faults diagnosis and their discrimination from the supply-voltage unbalance effects in operating three-phase squirrel cage induction motors. Both simulation and experimental results are presented to demonstrate...
This paper presents a fault-tolerant converter intended for AC regenerative drives requiring improved reliability and availability. The standard six-switch three-phase converter is rearranged in order to obtain a four-switch tree-phase converter (FSTPC) during post-fault operation. Thus, its performance relies heavily on the fault diagnostic technique to trigger the remedial procedures, and on the...
This paper presents a new diagnostic method based on the induction motor three-phase power analysis that is able to detect gear broken teeth. A gearbox mathematical model was developed to simulate the healthy and the broken tooth conditions. The simulation and experimental tests proved that the wavelet and spectrum analysis of the induction motor (IM) three-phase power are valuable techniques to diagnose...
This paper addresses recent advances in fault diagnosis by Park's Vector Approach, with special emphasis being given to the most recent developments concerning power converter fault diagnosis in variable speed ac drives. With the aim to demonstrate the suitability of such approach for power converters self-diagnostic, a detailed comparison of four algorithms intended for real-time diagnosis is also...
Fault-tolerant permanent magnet synchronous generator (PMSG) drives for wind turbine applications play a major role in improving reliability and availability levels, since power converters are very prone to fail. In this paper, a fault-tolerant converter with the ability to handle power switch open-circuit faults is addressed. The main concern of proposed converter topology is the minimization of...
Accurate fault identification allows the adoption of procedures that minimize the fault impact on the machines operation. Switched reluctance motors (SRMs) have been recognized for their fault-tolerant capabilities and they present a very robust configuration, particularly due to the absence of windings or magnets in the rotor. All these attributes make the SRM a competitive solution for aircraft...
The reliability of bidirectional dc-dc converters is a critical issue in many applications where the power flows from or to energy storage systems regularly, such as automotive applications and standalone power systems. This paper addresses dual active bridge converters faulty operation and proposes a fault detection method.
Fault diagnosis is a mandatory feature in fault tolerant systems, since it provides the information necessary for the fault isolation and system reconfiguration. Recently, permanent magnet synchronous generator (PMSG) drives have achieved prominence in wind energy conversion systems (WECS), due to their reliability and availability. Therefore, in this paper a new approach is proposed for current sensor...
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