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Wind energy conversion system control robustness based on current analysis of IGBT open-circuit fault

100%

Tayeb A. , Mahmoud M. M. , Azeddine B. , Edine C. B. D.

Przegląd Elektrotechniczny

2020

tom R. 96, nr 10

14--24

This paper deals with the study of the performance of a wind energy conversion system (WECS) based on a doubly fed induction generator (DFIG) under the IGBT open-circuit fault of the rotor side converter (RSC) during the application of robust control techniques, such as backstepping control (BSC) and sliding mode control (SMC). The presence of IGBT open-circuit faults in DFIG-WECS can disrupt service continuity resulting in financial loss. To overcome such a problem, robust control techniques are usually used as a solution. These control techniques are well known for their ability to treat non-linear structures as power electronics converters and to maintain the performance and stability of the DFIG-WECS connected to the network by the back-to-back converter in healthy and faulty operations. The aim of using robust non-linear control techniques is to obtain better performance and to extend the DFIG-WECS functionality in degraded mode in the event of a failure, and consequently to increase its reliability, unlike the proportional integral (PI) controller which shows less robustness when DFIG non-linearities are considered. The results obtained from these control techniques illustrate well the merits and the effectiveness of each of them in the case of healthy and faulty operations, in particular for the BSC technique, which shows a better performance compared to the SMC technique, which faces the main problem associated with discontinuous control.

Przedstawiono analizę właściwości systemu energii wiatrowej bazującego na igeneratorze DFIG w obwodzie IGBT z zastosowaniem odpornego sterowania typu backstepping BSC I sterowania ślizgowego SMC. Zastosowano nieliniową technikę sterowania. Badania symulacyjne wykazały odporność systemu zarówno w warunkach zdrowych jak i przy pojawieniu się błędów.

Study by modeling and simulation of open-switch fault diagnosis for five-level converters

100%

Becker F. , Jamshidpour E. , Poure P. , Saadate S.

Transactions on Environment and Electrical Engineering

2017

tom Vol. 2, No. 1

27--34

In this paper, an open-switch fault diagnosis method for five-level H-Bridge Neutral Point Piloted (HB-NPP) or T-type converters is proposed. While fault tolerant operation is based on three steps (fault detection, fault localization and system reconfiguration), a fast fault diagnosis, including both fault detection and localization, is mandatory to make a suitable response to an open-circuit fault in one of the switches of the converter. Furthermore, fault diagnosis is necessary in embedded and safety critical applications, to prevent further damage and perform continuity of service. In this paper, we present an open-switch fault diagnosis method, based on the switches control orders and the observation of the converter output voltage level. In five-level converters such as HB-NPP and T-type topologies, some switches are mostly 'on' at the same time. Therefore, the fault localization is quite complicated. The fault diagnosis method we proposed is capable to detect and localize an open-switch fault in all cases. Computer simulations are carried out by using Matlab Simulink and SimPowerSystem toolbox to validate the proposed approach.

Praca napędu z silnikiem PM BLDC w warunkach awarii tranzystora komutatora elektronicznego

84%

Skóra M.

Przegląd Elektrotechniczny

2016

tom R. 92, nr 6

47--52

Celem niniejszej pracy jest przedstawienie pełnego procesu diagnostycznego sterownika silnika PM BLDC – od wykrycia uszkodzenia, jego identyfikacji i izolacji aż do działania napędu po dokonaniu kompensacji uszkodzenia. Wyniki zilustrowano przykładowymi przebiegami uzyskanymi podczas eksperymentu na stanowisku badawczym.

The paper presents a complete diagnostic process of PM BLDC motor driver – from detection of the transistor fault, the fault identification, isolation and finally compensation of damage. The results are illustrated with examples of waveforms obtained during an experiment on laboratory stand.