Abstract
In this paper, an effective strategy is presented to realize IGBT open-circuit fault diagnosis for closed-loop cascaded photovoltaic (PV) grid-connected inverters. The approach is based on the analysis of the inverter output voltage time waveforms in healthy and faulty conditions. It is mainly composed of two parts. The first part is to select the similar faults based on Euclidean distance and set the specific labels. The second part is the classification based on Principal Component Analysis and Support Vector Machine. The classification is done in two steps. In the first, similar faults are grouped to do the preliminary diagnosis of all fault types. In the second step the similar faults are discriminated. Compared with existing fault diagnosis strategies for several fundamental periods and under different external environments, the proposed strategy has better robustness and higher fault diagnosis accuracy. The effectiveness of the proposed fault diagnosis strategy is assessed through simulation results.
Highlights
Among the renewable energies promoted worldwide due to the environmental issues, photovoltaic (PV) energy systems are one of the most promising due to its lower environmental impact and abundance [1]
One key aspect in power electronic system is reliability [3], for those applications that consider availability as a critical parameter, it is important that the application continues to operate even under faulty conditions
Fault diagnosis methods can decomposed in four steps: modelling, pre-processing, feature extraction inverter fault diagnosis, arebelimited in scope
Summary
Among the renewable energies promoted worldwide due to the environmental issues, photovoltaic (PV) energy systems are one of the most promising due to its lower environmental impact and abundance [1]. Thanks to the development of power converters and their control, PV plants can be connected without degrading the energy conversion efficiency thanks to the low switching frequency of cascaded multilevel inverters [2]. For PV grid-connected system, the performance of the inverter is one of the key factors that determine whether the system can continue to operate. Open-circuit and short-circuit faults are the most common faults affecting inverters. Since most modern gate-drivers are equipped with short-circuit protection unit, open-circuit fault attracts more attention [4]. The output voltage is distorted and the produced power is degraded. If it Electronics 2020, 9, 429; doi:10.3390/electronics9030429 www.mdpi.com/journal/electronics.
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