Abstract
This paper proposes a robust fault detection and isolation (FDI) technique for the power electronic converter (PEC) of doubly-fed induction generator (DFIG) wind turbines (WTs), and in particular for open-circuit faults herein. It combines fault indicators based on the processing of the Clarke transformation of the converter currents and a statistical change detection algorithm, namely a cumulative sum (CUSUM) algorithm that detects significant changes in the variance of the reactive power. This allows for a reduction of the false alarm rate compared to an approach relying exclusively on the current analysis. The proposed FDI technique is validated by means of both simulation and experimental results.
Highlights
Given the increased penetration of the wind power into the electrical grid, wind turbines (WTs) reliability and its influence on maintenance & repair costs are today one of the major concerns both for WT manufacturers and wind-farm operators
Simulation Results The proposed fault detection and isolation algorithm is validated through simulation for three different cases as follows: (i) Open-switch and open-phase fault in the rotor-side converter (RSC) (Rated condition). (ii) Open-switch and open-phase fault in the grid-side converter (GSC) (Rated condition). (iii) Speed and load variation
The doubly-fed induction generator (DFIG) WT is working at rated condition (1400 rpm/-10 kNm) and the sampling frequency of the signals has been set to 1 kHz
Summary
Given the increased penetration of the wind power into the electrical grid, WT reliability and its influence on maintenance & repair costs are today one of the major concerns both for WT manufacturers and wind-farm operators. Compared to steam/hydro/gas turbines, WTs are usually operated in harsher environments, and have relatively higher failure rates [1]. DFIG has been the most used generator for variable-speed wind energy conversion systems (WECS) [3]. In addition to being an attractive cost solution regarding the PEC, sized at approximately 30% of the generator rated power, the DFIG topology (Figure 1) allows for great control flexibility during its operation. With the construction of WTs of continuously increasing rated power in harsher environments (e.g. offshore wind farms), the reliability of WT components has become a critical challenge. PECs are responsible for 25% of the total number of failures and 14% of the total downtime in WTs [1]
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