A New Dynamic Equivalent Model for Microgrids Including Distributed Generation Units and Static Compensators

Due to the expansion and increasing penetration level of distributed generation units which are usually inertialess or low inertia, new challenges have arisen in power system studies. Thus, in power system studies, microgrids which may have numerous distributed generation units should be modelled and simulated that is very time consuming and complex. Therefore, dynamic equivalencing of microgrids in order to reduce computation burden and complexity is inevitable. In this paper, a new method for dynamic equivalencing of microgrids that includes inverter-based generation units and DSTATCOMs is proposed. The proposed equivalent model is a physical one which includes components such as equivalent converter, controller, resistance, reactance and equivalent load. Using the measurement data at the point of common coupling and utilizing optimization procedure, the parameters of the equivalent model will be identified. The proposed method is applied to IEEE 33-bus test system to show its accuracy and effectiveness.