Abstract
This paper discusses open-circuit fault (OCF) diagnosis and fault-tolerant control strategy (FTCS) of a nonisolated DC-DC converter. The photovoltaic power conversion structure (PPCS) consists of a photovoltaic generator and an interleaved Boost converter (IBC). The maximum power point tracking (MPPT) control of the IBC ensures operation at maximum power. The design of the nonlinear Backstepping control is detailed based on the equivalent average model of IBC, and the stability is studied using Lyapunov’s theorem. The proposed OCF fault detection is based on sampling the voltage across the inductor at a much higher frequency than the switching frequency. In an OCF situation occurrence and a high control signal state, the detection of three negative samples is a condition for signaling the presence of an OCF fault; the photovoltaic system continues its normal operation. The simulation results show the validity of the proposed FTCS. The proposed diagnosis and control strategy improves the performance of the IBC in terms of cost, reliability, and service continuity.
Highlights
For several years, photovoltaic energy has become one of the most requested renewable energy sources since it is more suitable even in the low levels of irradiation, it is modular, and it has less need for maintenance
The principle of the open-circuit fault (OCF) fault detection method is achieved by measuring the voltage across the faulty switch which becomes greater than the input voltage
The adaptation circuit consists of a (IBC) is controlled to reduce the ripple of the power transmitted to the load
Summary
Photovoltaic energy has become one of the most requested renewable energy sources since it is more suitable even in the low levels of irradiation, it is modular, and it has less need for maintenance. The proposed method is validated using a Boost converter, and the simulation and practical results show the validity of the proposed method The advantages of this method are the fault detection and isolation of a power switch, a sensor, and a capacitor in addition to its robustness with respect to system uncertainties and noise. In [10], fast fault detection method (FDM) is discussed in a photovoltaic system based on a Boost converter. The proposed method detects the fault for less than one period and it has advantages of simplicity of implementation and the possibility of application in other DC-DC conversion structures (Buck, Boost, and Buck-Boost).
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