Abstract
Renewable Energy sources present an efficient and economically viable energy supply approach for stand-alone applications. Electricity produced with Photovoltaic (PV) panels is among the most important energy contributions in energy harvesting systems. Moreover, the produced electrical power should not be interrupted, especially in critical applications. In this paper, the service continuity of a Buck/Buck-Boost converter, used as an interface between the PV source and the load, is discussed. A new fault tolerant converter topology is proposed, which allows to guarantee service continuity in open circuit switch fault cases, when a synchronous control is applied. A single additional switch, associated with two diodes, allows to keep the same power exchanges capabilities after open switch fault diagnosis, without modifying the synchronous control applied in healthy conditions. The resulting fault tolerant system is validated by simulation and the obtained results confirm the effectiveness of service continuity under open circuit switch fault.
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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