This study seeks to find a cost effective energy storage solution to reduce grid frequency variation due to high penetration of wind in an islanded grid. Energy storage systems are able to meet the fast ramp rates required to stabilize fast fluctuations from wind; however, its high cost remains a drawback for utility or customers seeking to utilize it. This paper documents a simple way of sizin...

The battle for electricity customers in an increasingly competitive and deregulated market environment is one of the challenges facing the electric power utilities of today. Customers expect a reliable and efficient supply of power from their utilities. One of the advantages that a distributed generator (DG) can provide to the electric utility and to customers is the possibility of improving th...

This paper suggests an approach of synchronized and incorporated management of solar power PV generators with the maximum power point tracking (MPPT) management and battery power storage space management to offer 1)voltage and frequency (V-F) support to an islanded microgrid 2) real and reactive power (P-Q) support during grid connection. The present novel control strategy show the the effectiv...

In this paper, the concept of secondary control is applied for voltage unbalance compensation in an islanded microgrid. The aim of the proposed control approach is to enhance the voltage quality at the point of common coupling (PCC). Unbalance compensation is achieved by proper control of distributed generators (DGs). The DGs control structure mainly consists of active and reactive power contro...

In this paper, a strategy based on Genetic algorithm for optimal allocation of reactive power resources in distribution system with microgrid is presented. In the proposed approach uncertainty in power generation of renewable based DG is considered. The main objective is to allocate fixed and switched capacitors as reactive power resources for voltage control within the desired limits on a dist...

A new procedure for the design of the droop control for voltage source converters (VSC) in islanded microgrid is presented. The droop control is commonly used to achieve the power balance in power system. It consists in a simple proportional control and the selection of its gains are commonly based only on power balance criteria. However, some values of the gains may cause poor damped responses...

A microgrid is a cluster of interconnected distributed generators, loads and intermediate storage units that cooperate with each other to be collectively treated by the grid as a controllable load or generator. Power quality events and pre-set conditions will make the microgrid disconnect from the main grid and operate as a separate island. This paper enumerates and discusses the issues concern...

Abstract For any $r\in [0,1]$ we give an example of a rigid operator whose spectrum is the annulus $\{\lambda\in \mathbb{C} : r \le |\lambda| 1 \} $ . In particular, when $r=0$ this and non-invertible, {\kern1pt}] 0,1 [ invertible but its inverse not rigid. This answers two questions Costakis, Manoussos Parissis [Recurrent linear operators. Complex Anal. Oper. Theory 8 (2014), 1601–1643].

This paper contains a control scheme for power sharing in islanded microgrids with invertersourced distributed energy resources that combines robust control and droop control. As the load within the microgrid changes, the inverter-sourced generators share the change in the load; this paper shows that the uncontrolled load sharing among the generators will be arbitrary and methods such as droop ...