This project deals with optimally placing a Thyristor Controlled Series Compensator (TCSC) using fuzzy logic to improve voltage profiles in transmission lines and ensure reliable power system operation. A fuzzy logic controller will be developed for the TCSC's shunt and series converters. The IEEE 14 bus system in Mi-Power software will be used as the test system. Contingency ranking and TCSC placement will be based on post-contingency values like loading percentage, voltage stability index L-index, and bus voltages, expressed in fuzzy notation and processed by fuzzy rules. The L-index calculation method and an example 4 bus system are described.

1. Guided by:-
Prof. Ramesh G B
Prof. Rudresh B M
Presented by:-
ANIL I S
SOMANAGOUDA
MALAPPA

2. CONTENTS
 Objective of the Project
 Project Description
 FACT’s Devices
 Classification of FACTs
 TCSC

3. Objective of the Project
This project deals with the optimal placement of
Thyristor Controlled Series Compensator (TCSC) using
Fuzzy logic for voltage profile improvement in
transmission line and reliable operation of power system.
The controllers of the shunt and series converters of the
TCSC are developed using Fuzzy logic to enhance voltage
stability of the power system network. The simulation will
be conducting in Mi-Power software environment. where
IEEE 14 bus system will be chosen as test bench systems.

4. Project Description
 The location of TCSC device in the power system on the basis
of static performances.
 Fuzzy set based reasoning approach will be developed for
contigency ranking .
 In the proposed project the post contingent quantities like
Percentage Loading, L-Index and bus voltages will be
expressed in fuzzy notation and will be further processed
through fuzzy reasoning rules to achieve desired contingency
list for selection of suitable locations of TCSC.
 By Newton Raphson(NR) method, the value of L-index will
be calculated for various contingency cases.The selection of
TCSC location will be testing on IEEE 14 bus system on Mi-
POWER platform

5. FACTS DEVICES
FACTS devices are defined by the IEEE working group as “Flexible alternating
current transmission system incorporating power electronic-based and other static
controllers to enhance controllability and increase power transfer capability”

6. Classification Of FACTS

7. TCSCThyristor Controlled Series Capacitor (TCSC) is a series reactance
compensator which consists of a series capacitor bank shunted by a thyristor
controlled reactor in order to provide a smoothly variable series reactance
C
T2

8. MiPower

9. Voltage Stability Index (L-index)
computation
 Consider a system where n is the total number of buses with,1,
2…g, be number of generator buses, and g+1.....n, remaining (n-
g) buses. For a given system operating condition, using load flow
results, the voltage stability L-index is computed
𝐿𝑗 = 1 − 𝑖=1
𝑔
𝐹𝑖𝑗
𝑉 𝑖
𝑉 𝑗
 Where j=g+1…..n and all the terms within the sigma on the RHS
of the above equation are complex quantities. The values of 𝐹𝑖𝑗
are obtained from the network Y-bus matrix. For a given
operating condition
𝐼𝑔
𝐼𝑙
=
𝑌𝑔𝑔 𝑌𝑔𝑙
𝑌𝑙𝑔 𝑌𝑙𝑙
𝑉𝑔
𝑉𝑙

10. CONTD.
 Where 𝐼𝑔 , 𝐼𝑙 and 𝑉𝑔, 𝑉𝑙 represent complex current and voltage
vectors at the generator nodes and load nodes
 L-index for all load buses (n-g) is given by
𝐿𝑗 = 1 − 𝑖=1
𝑔
𝐹𝑖𝑗
𝑉 𝑖
𝑉 𝑗
 |Ygg|, |Ygl|, |Yll| and |Ylg| are corresponding partitioned
portions of network bus matrix.
𝐹𝑗𝑖 = − 𝑌𝑙𝑙
−1
𝑌𝑙𝑔

11. 4 Bus System
4 Bus System diagram.

12. Contd.
 𝑌𝐵𝑢𝑠 for the given system.
 Bus voltages from load flow:

13. Contd.
 The elements of the 𝑌𝐵𝑢𝑠 are required for the calculation of L-
index are 𝒀 𝑳𝑮 and 𝒀 𝑳𝑳:
 Matrix 𝑌𝐿𝐺
 Matrix 𝑌𝐿𝐿

14.  𝐹𝐿𝐺= -[𝑌𝐿𝐿]−1
[𝑌𝐿𝐺]
Matrix 𝐹𝐿𝐺