Dynamic and Transient Analysis of a Wavelet-Based Protection Scheme for Smart Grids

Transformation of traditional electrical power networks into a Smartgrid has provided numerous ways to integrate clean and sustainable energy resources in the electrical grid. It is difficult to manage and control Distributed Energy Resources (DERs) with their increasing penetration at the distribution level. One of the technical challenges associated with the implementation of smartgrids is an effective protection strategy for grid-connected and island mode. Wavelet based protection schemes have emerged as a solution to this problem. In this paper, we have analyzed the effectiveness of a wavelet based protection strategy under dynamic and transient conditions within a microgrid. A symmetric fault is introduced to simulate transient behavior and switching of load is used to simulate the dynamic response. A microgrid model, consisting of renewable energy based DERs is simulated using MATLAB/Simulink SimPowerSystems. The analysis verified that a wavelet based strategy is able to distinguish between faults and disturbances in the system which can lead to the implementation of an effective protection scheme for microgrids.