Page 55 - Hybrid-Renewable Energy Systems in Microgrids

P. 55

Integrated renewable energy 3

sources with droop control

techniques-based microgrid

operation

Wilson Jasmine Praiselin, J. Belwin Edward
VIT University, Vellore, India

1 Introduction

Due to environmental and economical benefits, RES has increased the share of power
generation from distributed energy resources (DERs) and the development of clean
energy [1]. Accordingly, the annual CO emission could be reduced by 5% by 2030
2
as recommended by the US power system generation [2]. In the last few years, power
and energy researchers and engineers had to redesign the conventional power systems
for developing possible solutions like renewable-based distributed generation (DG)
units, AC microgrids, energy storage systems (ESS), flexible AC transmission systems
(FACTS), control methods, and so on. But the aforementioned redesigning procedures
are not done now as the researchers have moved on to develop advanced control strate-
gies. The interconnection of distributed generation units in the electrical power system
is essential for sustaining the use of RES. With the growing penetration of RES-based
DERs, the distributed system faces more difficulty in maintaining the stability and
security problems of the power system [3]. The existing AC power system operation
based on the frequency level, voltage level, and protection standards could be utilized
in the AC microgrid [4].
To manage our future power demands and to be versatile and informative within the
low voltage distribution networks and also the applications of each single distributed
generator will cause as many problems [5]. Therefore, microgrids are emerging and
becoming more attractive and main constituents with integration of RES-based DG
units and ESS of the future power grids [6]. Most common controllable renewable
resources like wind, solar, micro turbines or fuel cells, and ESS like batteries, super
capacitors, and flywheels are connected at the distributed voltage level considered for
supplying the load [7]. By implementing microgrids in the electrical energy group
various necessities like customer's expectation and the stakeholders are met. The pol-
icy of microgrid operation is related to various issues such as flexibility, stability,
and power quality [8]. In the distributed generation resources (DERs) such as genera-
tion units, and loads that can have the efficiency and sustainability of the system and
negative impacts like reduction of reliability and power quality should be taken in the
policy of microgrid operation. Microgrids can involve in distribution utility demand

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