In this section, we first solve placement of TCSC in order to improve voltage static
stability and reduce power loss in normal conditions of network and then we deal with
3.1. LOCATION OF TCSC DO TO STATIC VOLTAGE STABILITY IMPROVEMENT
AND POWER LOSE REDUCTION IN NORMAL CONDITION OF NETWORK
In this section genetic algorithm and PSAT toolbox have been used to run simulation.
Flowchart of this program has been presented in figure (2). Input of this program (primary
population) is place and capacity of TCSC which are set in chromosomes and output of
program is also optimum place and capacity of installation of this program. Characteristics of
genetic algorithm have been presented in table (1). Since the problem is about minimizing, λ
index is used in simulations.
Table.1: Characteristics of the used genetic algorithm
Number of Population
24
number of generation times
60
Mutation possibility
0.04
Cutting possibility
1
Chromosomes input
Location and capacity of TCSC
The objective function
The value of λ index and power losses
Range of equipment capacity changes
0.2~0.8 line reactance
Start
Create an initial population
Calculate the fitness function (index λ and
losses) for each member of the population
Select superior of the parent
Production of Children By applying
cutting and mutation operators
Is it enough a
generation
process?
Selection superior member as a optimum answer
End
Yes
No
Fig. 2: flow chart of demand response location program to improve the static voltage stability
using genetic algorithms
Table. 2: Characteristics of the output points of maximization function λ and minimization the
power losses
Optimum location of TCSC
Optimum
capacity
of
TCSC
Power losses
The value of λ index
The line 12 between buses
6 and 10
80%
0.0428
3.0408
Fig. 3: Genetic algorithm output with objective functions λ and power losses in normal
condition of network
3.2. LOCATION OF TCSC DO TO STATIC VOLTAGE STABILITY IMPROVEMENT
AND POWER LOSE REDUCTION IN EMERGENCY
CONDITION OF NETWORK
Results of running the program, using genetic algorithm in emergency conditions of
network have also been presented in figure (4) and table (3). By emergency conditions of the
network, exit of line between busses 5 and 7 due to error occurrence in network is meant. The
objective of this simulation is programming for the condition of network where usually some
lines have error.
Table. 3: Characteristics of genetic algorithm output points with objective functions λ and
power loss in emergency condition of network
Optimum location of TCSC
Optimum
capacity
of
TCSC
Power losses
The value of λ index
The line 12 between buses
6 and 10
80%
0.0441
2.9867
Fig. 4: Genetic algorithm output with objective functions λ and power loss in emergency
condition of network
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