Study and Analysis of Thyristor Controlled Series Capacitor for Improvement of Transmission System Capacity
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Date
2017-01-20
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AAU
Abstract
An increase of power demand in recent years have developed a number of challenges for power
system engineers, for increasing the power transfer capability of the already installed
transmission system without the expansion of the existing or building new transmission
networks. Flexible AC transmission system devices such as thyristor controlled series
compensator can help increase power transfer capacity in heavily loaded networks because of its
capability to control power flow flexibly. This is where TCSC device is very useful because of
its low initial cost as compared to setting up a completely new transmission networks. The TCSC
technology makes use of the already installed generating and transmission systems with
minimum line losses and maximum use of the existing system.
The thesis analyses the importance of TCSC which is Series Compensation for the improvement
of transmission line utilization at Dedesa substation of 500kV transmission system stretched
from GERD to Holeta substation and designed TCSC for the system as good alternative for
power oscillation damping and SSR mitigation. The system is implemented using software.
Steady and dynamic stabilities power, voltage and current of the system are improved using
DigSILENT.
Generally, using TCSC the power capacity is increased from 5759 MW to 5916.35 MW, voltage
regulation is decreased from 3.95% to 3.02% and it is 10% of the building of new transmission
line which is cost effective method. With the firing control of the thyristors, its apparent
reactance is changed smoothly and rapidly for stability system from 83.60-157.72Ohms.
Description
Keywords
Series Capacitor, FSC, TCSC, MOV, Stability, Dedesa Substation, power transfer capacity