NDLI: Switch fault diagnosis for boost DC–DC converters in photovoltaic MPPT systems by using high-gain observers

Content Provider	IET Digital Library
Author	Trejo, Diego R. Espinoza Taheri, Shamsodin Sánchez, José A. Pecina
Abstract	Open- and short-circuit faults (OSCFs) in boost dc–dc converters for photovoltaic (PV) maximum power point trackers (MPPTs) imply an inefficiency after fault is triggered, which affect the security and profitability of PV projects. Hence, fault detection and isolation (FDI) techniques have become an important issue for PV technology. In this study, a model-based FDI technique is proposed to boost dc–dc converters in PV MPPT systems. As is well-known, major issues of model-based FDI techniques have always been parametric uncertainty and no-modelled dynamics. This study focuses on how to mitigate these shortcomings by applying a high-gain observer (HGO) as a residual generator. A striking feature of HGO's is that exponential stability is still guaranteed for bounded disturbances (or faults). As demonstrated in this study, under an integral control action in the closed-loop control system, OSCFs are characterised for ever-growing signals, enabling the suggested FDI scheme. Also, the FDI proposal is decoupled from PV current (irradiance changes) and load variations, thereby avoiding false alarms. Moreover, the output-injection gain and thresholds are selected such that the fault diagnosis is achieved in eight switching cycles, enabling a fast and reliable diagnosis. Experimental results are illustrated to validate the FDI scheme proposed in this study.
Starting Page	2793
Ending Page	2801
Page Count	9
ISSN	17554535
Volume Number	12
e-ISSN	17554543
Issue Number	Issue 11, Sep (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/12/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.6287
Journal	IET Power Electronics
Publisher Date	2019-06-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Boost Dc–dc Converters Bounded Disturbances Closed Loop System Control of Electric Power System Control System Analysis DC-DC Power Converter Fault Detection Fault Diagnosis High-gain Observer Maximum Power Point Trackers Model-based FDI Technique Observers Photovoltaic Maximum Power Point Trackers Photovoltaic MPPT System Photovoltaic Power System Power Converter Power Generation Control Power Supplies to Apparatus PV MPPT System Short-circuit Fault Solar Power Stations Stability in Control Theory Switch Fault Diagnosis Synthesis Method
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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