A Nonlinear Supplementary Controller for Transient Response Improvement of Distributed Generations in Micro-Grids

This paper proposes a nonlinear supplementary controller for enhancing the transient response of distributed generations (DGs) in micro-grids. The proposed supplementary control system is based on an interconnection and damping assignment passivity-based controller and is designed according to the port-controlled Hamiltonian model of DGs. The controller is applied to the decentralized unified control scheme of DGs that enables seamless transitions between islanded and grid-connected modes. The proposed controller is generic and can be applied to DGs with different types of primary sources. The stability of the proposed supplementary controller is verified analytically, and the performance of the proposed controller is verified in a multi-resource micro-grid via time-domain simulations.