A Virtual Impedance Based Analysis of Dynamic Stability in a Micro-Grid System

Various aspects of instability in a micro-grid system were analysed in this paper. To maintain the optimum power flow in the system various control and compensation techniques were implemented in the micro-grid system. These techniques may induce small changes in the power system parameters. All the compensation and control techniques implied in the system should not result in large changes in system behaviour. In distributed generation mostly wind turbines would supply the major part of the grid. Induction generators in wind turbines will induce large reactive power in micro-grid which would definitely need to be compensated. To improve the power quality in the system, filters were designed which might cause dynamic transients in the system. A detailed analysis of dynamic instability in the micro-grid system was analysed and a diagnostic algorithmic approach for improving the stability in the grid was proposed in the paper.