Abstract
This paper proposes a fault identification system for short and open-circuit switch faults (SOCSF) for a dc/dc converter acting as a Maximum Power Point Tracker (MPPT) in Photovoltaic (PV) systems. A closed-loop operation is assumed for the boost dc/dc converter. A linearizing control plus a Proportional-Derivative (PD) controller is suggested for PV voltage regulation at the maximum power point (MPP). In this study, the SOCSF are modeled by using an additive fault representation and the fault identification (FI) system is synthesized departing from a Luenberger observer. Hence, an FI signal is obtained, which is insensitive to irradiance and load current changes, but affected by the SOCSF. For FI purposes, only the sensors used in the control system are needed. Finally, an experimental evaluation is presented by using a solar array simulator dc power supply and a boost dc/dc converter of 175 W in order to validate the ideas this study exposes.
Highlights
IntroductionIn spite of spectacular progress of the Photovoltaic (PV) solar energy in the last years, some problems remain to be solved in order to maximize the efficiency and security (on-site diagnostic functions) of PV systems
In spite of spectacular progress of the Photovoltaic (PV) solar energy in the last years, some problems remain to be solved in order to maximize the efficiency and security of PV systems
This paper proposed a model-based fault identification (FI) system for short and open-circuit switch faults (SOCSF) in a boost dc/dc converter acting as a PV
Summary
In spite of spectacular progress of the Photovoltaic (PV) solar energy in the last years, some problems remain to be solved in order to maximize the efficiency and security (on-site diagnostic functions) of PV systems. System for short- and open-circuit switch faults (SOCSF) in MPPT systems would be useful to increase the efficiency and reliability of PV systems With this goal in mind, some fault detection and isolation (FDI) proposals have been reported so far in the literature. In [10], an FDI technique is proposed for dc/dc converters by using the magnetic component voltage and the switch gate-driver signals. Energies 2018, 11, 616 considering any duty cycle and switching frequency operation In this case, the switch gate driver signals are used in the FDI stage in conjunction with the sign of the inductor current slope. Open-circuit switch FDI and fault-tolerant strategy in a three-level boost converter were proposed in [13] for a PV power system supplying batteries. System with fault tolerance capability, [11]
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