presentation on Facts Technology Development: An Update

7/27/2019 presentation on Facts Technology Development: An Update

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By Harsha.KUniversity Visvesvaraya College of Engineering

Seminar Guide Mrs. B. C. Sujatha



Real and Reactive power on a transmission line in an integratednetwork is governed by the line impedances, voltage magnitudes,angle difference at the line ends etc. The power transfer limits on a

transmission line are in general determined by Thermal level

Uncontrolled power flow level

Stability level

The proper implementation of FACTS controller provides rightcorrection of various parameters on the transmission line. Hence, fullutilization of transmission system is possible and also relieving thebottle necks.

University Visvesvaraya College of Engineering



The Electric Power Research Institute has sponsored a FACTSresearch program that includes software and hardware developments.

In software many analytical models were developed which includedsimulation programs. As a result in United States the power transfercapability of three transmission system have been increased.

The hardware development program demonstrated control of various line parameters.




The analytical and mathematical models for FACTS controllers were developed. The results of these studies have shown thatimplementation of FACTS controllers would result in increase inpower transfer capacity of the transmission line.

Some of the computed results of power transfer capability of

transmission system; increased transfer of power from 300 MW to400 MW (boosting almost 33%) in the United States.




This program has evolved in full-scale hardware demonstration of FACTS controller which provide dynamic control of varioustransmission line parameters.

The status of ongoing development include 208 MVAR TCSC atSlatt substation, 100 MVAR STATCOM at Sullivan substation, UPFC

of 160 MVA at Inez substation and also CSC of 200 MVA at Marcy substation.




FACTS controllers has pushed several R&D breakthroughs in thearea of power electronics.

The development of solid state switches to meet the high MVA rating in power transmission system, due to its high switchingspeed.

STATCOM and UPFC and CSC FACTS controller is a voltage-sourced inverter (VSI) which inverts a dc voltage into a set of three-phase voltages.




Implementation of a STATCOM at Sullivan substation improved the

transmission line parameters also reduced use of the tap changer from250 times to 2 to 5 times per month.

Implementation of UPFC at Inez substation allowed flexible control

of real and reactive power flow on new 138 kv transmission line.

CSC at Marcy substation improved voltage control also reducing thetransmission losses.




At this site the total range of reactive power output of STATCOM

can be utilized. Since it is connected to the bulk load.

STATCOM consisted of 48-pulse, two-level, VSI that combineseight, six-pulse three-phase inverter bridge, each with rating of 12.5

MVA.

The STATCOM regulates the 161 kv bus voltage during daily loadincreases to minimize activation of tap changing mechanism.







The power demand on this line is approximately 2000 MW and isserved by long, heavily loaded 138 kv transmission.

Two identical, three-level 48-pulse, 160 MVA voltage sourceinverters coupled to two sets of dc capacitor banks.

Optimal utilization of the existing transmission system and

independent control of real and reactive power is possible.










This Substation has two major interfaces which are limited to6150 MW and 2880 MW respectively.

This innovative concept provides the operational functionality toeliminate the current limits on the transmission line.

Benefits after implementation are maximum utilization of transmission system, improved voltage control, reduced systemlosses etc.







FACTS technology has been successfully demonstrated andcontinues to be implemented at transmission locations all over the

world.

As the FACTS controllers are evolving, there will be need for an

overall controller logic to optimize transmission system operations.




A, Edris, “Flexible ac transmissionsystem (FACTS): A technology maximizing utilization of powertransmission”, Cigre Regional Meeting, 27-

30 September 1997.

Ram Adapa “FACTS System Studies”, IEEE Power Engineering Review,December 2000.





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presentation on Facts Technology Development: An Update