RTDS Implementation of the Optimal Design of Grid-connected Microgrids Using Particle Swarm Optimization

The dynamic nature of the distribution network challenges the stability and control of the microgrid. In this paper, a simplified simulation model of an inverter-based microgrid in the grid-connected mode is implemented in real- time on a Real-Time Digital Simulator (RTDS®). The simulation is performed fast because RTDS works in continuous sustained real-time. All components such as the inverter bridge, LC filter, coupling inductor and grid are modeled using their physical representation in standard library blocks. The inverter bridge is modeled by the assumption of ideal sources. Optimal design of the LC filter, PI controllers, and damping resistance obtained using particle swarm optimization (PSO) in the optimal nonlinear model of the grid-connected microgrid is used in the simulation model. Nonlinear time domain simulation has been carried out to assess the effectiveness of the proposed controllers under disturbance. The results show satisfactory performance with efficient damping characteristics of the microgrid considered in this study. Additionally, the effectiveness of proposed approach for optimizing different parameters and its robustness have been confirmed through the nonlinear time domain simulations. The performance of this controller has been verified in simulation using a RTDS.