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    Dependability Improvement of Embedded Systems through Compiler Level Approaches

    , M.Sc. Thesis Sharif University of Technology Mokhtarpour, Azadeh (Author) ; Miremadi, Ghassem (Supervisor)
    Abstract
    Reliability is an important concern in safety-critical applications. Hardware and software redundancies are used to include reliability in such systems. Software approaches benefit from high flexibility and low cost. Moreover, they do not impose any hardware modifications to the design. The most important challenges of software approaches are performance and code size overheads. Some of software reliability approaches duplicate all of the program’s instructions which impose high performance overhead to the designs. Some other approaches only apply the redaduncies to critical instructions in the programs. While these approaches impose the the performance overhead but they suffer from fault... 

    Extending protection selectivity in low voltage DC microgrids using compensation gain and artificial line inductance

    , Article Electric Power Systems Research ; Volume 188 , 2020 Shamsoddini, M ; Vahidi, B ; Razani, R ; Nafisi, H ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    Vulnerability of power electronic converters in DC microgrids in case of fault occurrence in DC cables necessitates using a fast fault detection and isolation scheme. In this paper, a modified, fast and selective protection scheme has been presented, which provides the required tripping of low voltage DC (LVDC) microgrids. This protection scheme has been developed based on the natural characteristics of the fault current, in which the first and second derivatives of the fault current have been employed to define thresholds for discriminating between faulted and non-faulted situations. To enhance fault detection capability of the protection scheme, definition of thresholds have been improved...