Protection for grid connected wind systems with the implementation of solid state circuit breakers
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This thesis focuses on the implementation of ultra-fast opening of solid state circuit breaker (SSCB) in a distribution grid system for a wind farm. The proposal for the implementation of an SSCB is to overcome the adverse effects of extremely high fault levels. The fast operation (fraction of half cycle) makes the distribution system less susceptible to peaks during the faults. The important criteria for specifying an SSCBs is the rated current and duration the system can withstand current without producing adverse effects. This is the basis for the classification of an SSCB for any system. The fast current interruption of an SSCB produces a transient recovery voltage (TRV). The expression of rate of rise of recovery voltage (RRRV) and TRV produced across the circuit breaker is formulated for a generic system, which is essential for designing the electrical interface protection circuitry for an SSCB. A "DistributionSSCB" GUI tool is developed for a distribution system having a grid connected wind system based on the modeling parameters defined for designing an SSCB protection scheme. This tool assists in the study of various types of SSCBs and the transient response of the electrical equipment to an SSCB operation. Finally, with the implementation of the tool, an analysis is performed on the application of an SSCB in the grid connected wind systems, behavior of the electric components, and the system response to an SSCB when an internal or transient fault. Also, the use of an SSCB eliminates the need to upgrade the circuit breakers at the feeder of the bus when connected to the distributed generation.