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Adaptive threshold based new active islanding protection scheme for multiple PV based microgrid application

Adaptive threshold based new active islanding protection scheme for multiple PV based microgrid application

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A new adaptive active islanding protection scheme is presented for a multiple photovoltaic (PV) based microgrid environment, where islanding detection parameters are estimated in adaptive manner according to operational PV penetration level. Dynamic threshold calculation is obtained by a piecewise cubic Hermite polynomial interpolation to detect islanding for a PV based voltage source converter (VSC), where inconsistent solar irradiation profile is subjected to the system connected to local utility through point of common coupling (PCC). The VSC pulse-width modulation inputs are obtained from primary second-order phase locked loop based control path, where instability to detect islanding is achieved by active injection of error dynamics (parallel islanding protection path). The disturbance injection is decided from islanding detection parameter (i.e. harmonic amplification factor, %HAF) of PCC voltage and the VSC instability is achieved by desired unstable closed-loop poles of parallel detection path. UL 1741 standard is considered for the proposed multi-PV microgrid, for worst-case scenario study.

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