Abstract
This paper proposes a new Unified Switch Fault Diagnosis (UFD) approach for two-stage non-isolated DC-DC converters used in energy harvesting applications. The proposed UFD is compared with a switch fault diagnosis consisting of two separate fault detection algorithms, working in parallel for each converter. The proposed UFD is simpler than the two parallel fault diagnosis methods in realization. Moreover, it can detect both types of switch failures, open circuit and short circuit switch faults. It can also be used for any two-stage non-isolated DC-DC converters based on two single switch converters, no matter the converter circuits in each stage. Some selected simulation and Hardware-in-the-Loop (HIL) experimentation results confirm the validity and efficiency of the proposed UFD. Also, the proposed UFD is applied successfully for fault-tolerant operation of a buck/buck–boost two-stage converter with synchronous control and a redundant switch.
Highlights
Because of the global problems of energy shortage and the impact of energy resources on our environment, energy harvesting techniques have become one of the most interesting research areas [1,2]
This paper focuses on the diagnosis of switch failures in DC-DC converters used in energy harvesting systems, that is mandatory for further fault-tolerant purposes
As it can be seen in the simulation results, the open-circuit faultsrequires (OCF) is detected, identified, and localized by parallel Fault Detection (FD) (OCF2 is set to “1”), while the Unified Switch Fault Diagnosis (UFD) has just announced a switch fault without fault localization and fault type identification
Summary
Because of the global problems of energy shortage and the impact of energy resources (coal, oil, and natural gas) on our environment, energy harvesting techniques have become one of the most interesting research areas [1,2]. In this paper, a unified approach for switch fault diagnosis is proposed using two-stage non-isolated DC-DC converters with fault-tolerant capabilities, supplied by a renewable DC source, such as TEG and/or PV. In. Section 5, the principle of an experiment based on Hardware-in-the-Loop (HIL) is first explained and applied to the case of a two-stage buck/buck–boost converter with fault-tolerant capability, based on synchronous control and a redundant switch. Both simulations and HIL results confirm the validity and effectiveness of the proposed UFD. Thanks to the FPGA implementation and algorithm performances, the fault can be detected in less than one switching period
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