Optimal Power Flow with Hybrid Distributed Generators and Unified Controller
Abstract: Optimal power flow
(OPF) study is conducted on a power system to achieve one of the following
objectives: cost/loss minimization or available transfer capability (ATC)
calculation in a deregulated environment. Distributed generation (DG) is a
small source of electric power conversion from non-conventional energy sources
and Hybrid DGs which often the most cost-effective and reliable way to produce
power. The optimality of control variables and minimum value of objective
functions in OPF study would definitely change when DGs are interconnected to
the grid. The change would be respect to the location, quantity and combination
of power injection by DGs. On the other hand, FACTS controllers are effective
in utilizing the existing of transmission network which is very important
especially in a deregulated system. Unified power flow controller (UPFC), a
second generation FACTS controller, is well known for minimizing the cost of
generation/losses with a good voltage profile as well as for ATC improvement.
This paper conducts a detailed OPF study on a 9 bus system for the above
mentioned three objectives to analyze the effect of DGs with and without UPFC.
From the results, it is found that hybrid DGs along with UPFC yields better
performance in many aspects.
Keywords: available transfer
capability (ATC), optimal power flow (OPF), particle swarm optimization (PSO),
unified power flow controller (UPFC)
Author: Lakshmi Ravi,
Vaidyanathan R, Shishir Kumar D, Prathika Appaiah, S.G. Bharathi Dasan
Journal Code: jptkomputergg120065
