Microgrid Connector Controller Prototype

The integration of Microgrids (MGs) into Active Distribution Networks (ADNs) to enhance grid resiliency requires a flexible, economical, and reliable MG-ADN interface. In this context, the Microgrid Connector Controller (MGCC) discussed in this paper has been demonstrated through simulations to offer a more cost-effective alternative than a Back-to-Back (B2B) interface while delivering similar performance. Therefore, the design and testing of an experimental MGCC prototype is presented here, proposing a four-stage start-up strategy to eliminate the need for an external dc source initially proposed for charging the controller’s DC Link capacitor, making the MGCC more practical and cost-effective. Based on the MGCC power flow characteristics, a charging resistor is required to provide a current path during the start-up process and divide the converter input voltage to match the low ratings of the MGCC components. The presented results from testing the MGCC prototype under several relevant conditions demonstrate the technical and practical feasibility of the MGCC topology and controls, as well as the effectiveness of the proposed start-up strategy.