Abstract
Numerous advantages offered by Photovoltaic (PV) generation systems coupled with the increasing power demands for clean energy put PV systems in the front of many research works. For stand-alone applications powered with PV systems, the reliability of the power conversion stage is essential to ensure the continuous supply of energy. Therefore, in the case of any failure occurring in the power conversion stage, it is mandatory to provide remedial actions to guarantee the service continuity of the produced electrical power. This paper analyses the service continuity of a two-stage buck/buck-boost converter with energy storage, driven with synchronous control. The initial two-stage converter is made fault-tolerant and robust to failures of its two switches by adding only one additional switch associated with two diodes. In this study, only open-circuit switch faults are considered. The proposed fault-tolerant circuit and the initial one have the same electrical behavior when synchronous control is used. The applied synchronous control in both healthy conditions and post-fault operation ensures the same functionalities without degrading the system’s performances. The proposed two-stage synchronously-controlled circuit is validated through simulation in the cases of open circuit faults on the two switches of the initial converter. The obtained results show the feasibility of the proposed functional redundancy and the continuity of operation at full power after switch fault diagnosis.
Highlights
The continued increase in fossil fuel costs and the increasing energy demands of autonomous systems have led to the development of sustainable energy systems [1]
An Open Circuit Fault (OCF) is generated by simulation on the switch S1 at time t = 0.25 s
The simulation results of the electrical power P delivered to the load, the switching frequency f, the output voltage VO across the load and the duty cycle D are presented in Figure 14 around the OCF
Summary
The continued increase in fossil fuel costs and the increasing energy demands of autonomous systems have led to the development of sustainable energy systems [1]. A degraded mode after fault compensation can be performed without redundancy, where the converter topology remains unchanged, and only its associated control is modified An example of this case is presented in [10], where a DC-DC converter for hybrid electric vehicles is studied. In the proposed approach, service continuity at full power is achieved by using both a fault-tolerant converter topology circuit without classical switches redundancy and the same control before and after fault diagnosis. Only a single redundant switch is used to guarantee the fault-tolerant operation of this two-stage conversion circuit and its overall service continuity. Some selected simulation results confirming the effectiveness of the proposed fault-tolerant topology are provided
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