Hyperbolic Tangent Exponential Sliding Mode Based Droop Control Operating Parallel Distributed Generation Units in Microgrid

This paper presents a combination between exponential sliding mode and droop control to enhance the active and reactive power sharing between two parallel inverters in micro-grid mode. The suggested control scheme consists of an inner control loop based on exponential sliding mode and outer control loop based on droop control. Furthermore, the developed method works toward overcoming the stability and robustness issues in the conventional PI- Droop controller. The system under study consists of two parallel 5-level diode clamped inverters to be operated in micro-grid mode connected to a common load. Simulation results are carried out using Matlab/ Simulink, where the suggested controller is compared to other methods to verify its robustness and effectiveness.