Application of TCSC in a grid and importance of using CPF to optimally place the TCSC on the transmission line to achieve the best result for transient stability.

1. Presented by
OKAFOR, CHINELO LINDA
M.Sc. MAIN RESEARCH WORK
SUPERVISOR
DR . S. ADETONA
OPTIMAL LOCATION OF TCSC USING CPF METHOD
TO IMPROVE TRANSIENT STABILITY OF A POWER
SYSTEM

2. INTRODUCTION
• FACTS are devices used to control the parameters such as
• voltage magnitudes, their angles, line impedances, active and reactive power flows of
a transmission line.
• FACTS controllers are grouped into
• shunt, series or both shunt and series compensation.
• They are namely:
• SVC, STATCOM, TCSC, SSSC, IPFC, UPFC, SMEs.
• Why Use TCSC To Improve Transient Stability?

3. Table 1

4. • TCSC is a module that consists of a fixed series capacitor in parallel
with a Thyristor controlled reactor (TCR) in series with a bidirectional
Thyristor valve that is fired with angle α ranging between 90° and
180° with respect to the capacitor voltage.
Fig.1: TCSC Model

5. PROBLEM STATEMENT
• A lot of literature has recorded success on the optimal location of
TCSC with different methods to improve the voltage profile of a
steady state network.
• However, studies on transient stability have concentrated on the
development of the TCSC control settings to improve transient
stability of the power system not considering the optimal location of
the TCSC but manually placing the TCSC at a guessed location.
• This possess a problem because placing TCSC on a guessed location
undermines its capability to significantly improve the Transient
stability of a power system.

6. AIM AND OBJECTIVES
• The aim of this study is to
• optimally locate TCSC in a grid so as to improve transient stability of the grid.
• These objectives are listed as follows:
• To study the transient stability of an uncompensated power system that is
subjected to a fault.
• To identify optimum location of injecting TCSC into a power grid using
Continuous Power Flow (CPF) method.
• To inject the TCSC in an optimum location obtained in step 2 into the power
grid; then observe how the transient stability develops in the grid, and
compare the results obtained in step 1.

7. Literature Review
Panda, S., N. P. Padhy, and R. N. Patel. "Modelling,
Simulation And Optimal Tuning Of TCSC
Controller." International Journal of Simulation
Modelling (IJSIMM) 6, no. 1 (2007).
Fine-tuned TCSC control parameters using Genetic
Algorithm
Rautray, S. K., S. Choudhury, S. Mishra, and P. K. Rout.
"A particle swarm optimization based approach for
power system transient stability enhancement with
TCSC." Procedia Technology 6 (2012): 31-38.
Used PSO to tune TCSC control parameters
Cvetkovic, Mios, "Power-Electronics-Enabled Transient
Stabilization of Power Systems" (2013).
Added PMU to enable the FACTS devices to react fast
to disturbances
S.B.Kamble, R.R Shah, ‘Transient Stability Study in
IEEE9 Bus System and Compensating Using TCSC’,
Journal of Network Communications and Emerging
Technologies (JNCET) Volume 6, Issue 8, August (2016)
Used closed loop control to modify the control
strategy of the TCSC where current and voltage are fed
back into the control system to calculate the TCSC
impedance.

8. METHODOLOGY
Studying the transient stability of an uncompensated grid that is
subjected to a fault
• IEEE 9 bus system taken as a case study
• The grid is modelled in PSAT environment in MATLAB. This is modelled in
Fig 2
• Fault is injected in bus 7
• When fault is injected, the result is obtained

9. Fig.2: IEEE 9 bus injected with fault

10. Identification of optimum location of injecting TCSC in grid
using CPF
• CPF is ran on the IEEE 9 bus injected with fault
• Result is investigated to determine the line with the highest losses
which is identified as the weakest line.
• The weakest line is identified as the optimal location to place the
TCSC. The result is shown in Fig.2

11. Fig.3: CPF Simulation result
-0.5
0
0.5
1
1.5
2
2.5
Bus 8-9 Bus 8-7 Bus 6-9 Bus 5-7 Bus 4-5 Bus 4-6 Bus 7-2 Bus 9-3 Bus 4-1
PowerLoss(p.u)
Line
P Loss [p.u.]
Q Loss [p.u.]

12. Injection of TCSC in an optimum location
• TCSC is optimally placed at the weakest line located from the CPF
simulation result.
• The line is seen to be in between bus 5 and bus 7. This is shown in Fig
4. Fig 5 compares the compensated and uncompensated grid.

13. Fig. 4: TCSC placed at optimum location

14. Comparison of compensated and uncompensated grid with
TCSC
Fig 5.1: Rotor angle of Generator 1&2 (TCSC
Uncompensated)
Fig 5.2: Rotor angle of Generator 1&2 (TCSC
compensated)

15. Comparison of compensated and uncompensated grid with
TCSC
Fig 5.3: Rotor speed of Generator 1&2 (TCSC
Uncompensated)
Fig 5.4: Rotor speed of Generator 1&2 (TCSC compensated)

16. Comparison of compensated and uncompensated grid with
TCSC
Fig 5.5: Bus Voltage (TCSC Uncompensated) Fig 5.6: Bus Voltage (TCSC compensated)

17. Comparison of compensated and uncompensated grid with
TCSC
Fig 5.7: Bus angle (TCSC Uncompensated) Fig 5.8: Bus angle (TCSC compensated)

18. Summary of Findings
It is evident from this research that:
• CPF can be used to find the optimal location of the TCSC for
improving transient stability of a given grid.
• TCSC optimally placed in the weakest line of a Transmission line
improves transient stability.

19. Concluding Remarks
• TCSC is a part of FACTS and it is very useful in improving transient
stability of the system amongst many of its benefits.
• The work has shown that as much as it is important to improve the
control settings of the TCSC device in order to improve transient
stability of the system, it is necessary to apply the TCSC in its optimal
location.
• The result got from the simulation shows that optimal location of the
TCSC improves the transient stability of the power system.

20. Thank You