Publication

Abstract : Renewable energy conversion has a lot of importance in meeting future energy demand as the availability of fossil fuels is limited. As renewable energy sources will be scattered at diverse sites, their coordination is a very substantial research topic. The inverters fed by these sources, connected in parallel, are usually controlled by the droop control method, which is simple and requires no communication among individual units. However, this method has poor transient performance. Moreover, it may not be suitable for resistive distribution lines due to the coupling between active and reactive power. These drawbacks are mitigated by amending the traditional droop control method. The effect of bringing in virtual impedance and dynamic droop gains is explored here. Further, a sliding mode controller is introduced in parallel with the droop controller for better performance. The eigenvalue analysis and the simulated system response validate the efficacy of the proposed control algorithm.