Coordinated active and reactive power management of microgrids in ride-through modes base on improved droop controls

Abstract

This paper presents a coordinated active and reactive power management of Microgrid with hierarchical control scheme. Microgrid is divided into clusters as the load requirement of power quality and reliability, i.e., multi-cluster architecture. Each cluster is managed individually by a cluster controller in coordination with local controllers of DG units. A hierarchical control scheme is employed with three levels including droop controls, load frequency controls and reserves. An improved droop control is introduced considering the comparability of resistance and inductance of the low-voltage network, the inter-relation of voltage and active power, as well as frequency and reactive power are taken into accounts. The proposed control scheme is applied to a case study in which a two-cluster Microgrid with three DG units is experiencing the ride-through mode after disconnecting from the main grid. The result of simulation shows the effectiveness of the proposed method.