Design and Analysis of Synchronverter based Virtual Inertia Control for Hybrid Power Plants /

Abstract

The shifting to a low carbon community is the actual driving force replacing the conventional power systems to escalate the volume of non synchronous generators i.e. renewable energy resources for the purpose of meeting the local load demand. Since the DG resources are intermittent in nature and load profile continuously varies with time, this causes dynamic frequency stability issues since these resources do not provide sufficient inertia to cater the frequency stability problems because of the presence of power electronics based converters used for their grid integration. To overcome this issue, the idea of virtual inertia introduction in such systems is implemented. A synchronverter is a 3-φvoltage source inverter accompanying a DC energy source that imitates the behavior of a synchronous generator thus offers a mechanism for the control of these RES in grid connected mode. The synchronverter behaves like a self-synchronization unit and tries to synchronize itself with the grid, thus providing the voltage and frequency support to the grid. This thesis presents a PV-Wind hybrid system simulated in MATLAB/Simulink using synchronverter to cater the frequency and voltage stability problems. The model is operated in grid connected mode and the effect of load variation and the provision of reactive load to the system parameters are being monitored. The features of synchronous generator including the frequency droop and voltage droop are properly observed by the system presented.