Validating Response of ac Micro-grid to Three Phase Short Circuit in Grid-Connected Mode Using Dynamic Analysis
This paper presents the results of attempt to validate the response dynamism of an 11kW, 575V wind turbine micro-grid connected to a 100MVA, 13.8kV utility under three phase bolted short circuit. The micro-grid was modeled using two Doubly-Fed Induction Generators (DFIGs). The test bed was developed in SimPowerSystems® at a system frequency of 50Hz with cut-in and cut-out wind speeds of 3ms-1 and 6ms-1, respectively. Short circuit fault is applied at 6.0s and withdrawn at 8.0s, and 50.0s dynamic response of the system is obtained for different fault locations, under voltage and reactive power controls of the wind turbine controller in grid-connected mode. The results of the study show bidirectional power flow due to power exchange between the utility and micro-grid, and poor post-fault sub-transient and transient instability associated with the micro-grid due to comparatively lower inertia. The study also shows that the micro-grid presents superior performance when stressed under Q control than under V control. Finally, the response of the test bed is found to be consistent with established short circuit theory, establishing its validity.
Maruf A. Aminu,
Validating Response of ac Micro-grid to Three Phase Short Circuit in Grid-Connected Mode Using Dynamic Analysis, International Journal of Electrical Components and Energy Conversion.
Vol. 2, No. 4,
2016, pp. 21-34.
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