An Innovative Transient Free Adaptive SVC in Stepless Mode of Control
Electrical distribution systems are incurring large losses as the loads are wide spread, inadequate reactive power compensation facilities and their improper control. A comprehensive static VAR compensator consisting of capacitor bank in five binary sequential steps in conjunction with a thyristor controlled reactor of smallest step size is employed in the investigative work. The work deals with the performance evaluation through analytical studies and practical implementation on an existing system. A fast acting error adaptive controller is developed suitable both for contactor and thyristor switched capacitors. The switching operations achieved are transient free, practically no need to provide inrush current limiting reactors, TCR size minimum providing small percentages of nontriplen harmonics, facilitates stepless variation of reactive power depending on load requirement so as maintain power factor near unity always. It is elegant, closed loop microcontroller system having the features of self regulation in adaptive mode for automatic adjustment. It is successfully tested on a distribution transformer of three phase 50 Hz, Dy11, 11KV/440V, 125 KVA capacity and the functional feasibility and technical soundness are established. The controller developed is new, adaptable to both LT & HT systems and practically established to be giving reliable performance.
[1] Hammad and B. Roesle, "New roles for static Var compensators in
transmission system", Brown Boveri Rev., Vol. 73, pp 314-320, Jun.
1986.
[2] J. Kearly et. al., "Microprocessor controlled reactive power compensator
for loss reduction in Rural Distribution Feeders", IEEE Transactions on
power delivery, Vol. 6, No. 4. October 1991, pp. 1848-1855.
[3] Narain G. Hingorani and L. Gyugyi, "Understanding FACTS" IEEE
Press.
[4] K. Stahllleopf, M. Wichelm, "Tighter Controls for Busier System",
IEEE Spectrum, April 1977, P 49-52.
[5] J. Grahm, "Transient stability enhancement using Static Var
Compensation", Wart Verginia University, Thesis, 378, 3543 Engg.
G76tc2, Oct. 1995.
[6] L. Gyugyi, R. A. otto, T. H. Putman, "Principles and Application of
Static Thyristor Controlled Shunt Compensations", IEEE Transaction on
Power Apparatus and Systems", Vol. PAS 97, No. 51978, pp 1935-
1945.
[7] Celli, F. Pilo, S. B. Tennakoon, "Voltage Regulation on 25 KV A. C.
Railway Systems by Using Thyristor Switched Capacitors", 0-7803-
6499-6/00 2000 IEEE.
[8] Edwards, K. Mattern, E. Stacey, P. Nannery and J. Gubernick,
"Advanced static Var generator employing GTO thyristors", IEEE
Trans. Power Del. VOl. 3, No. 4, pp1622-1627, Oct. 1988.
[9] M. F. Iizarry, Silvestrini, PREDA mitigation of back to back capacitor
switching transients on distribution circuits, San Juan PR00936.
[10] Turan Gonen, "Electric power distribution system engineering", CRC
press, 2nd edition.
[11] M. EI. Sharkawi, T. Williams, N. Buller, "An Adaptive Power Factor
Controller for Three Phase Induction Generator", IEEE tranction on
Power App and Systems, Vol. PAS 104, No. 7, July 1985, pp1825-1831.
[12] EI. Sharkawi, N. Buller, R. Yinger, "Development and Field testing of
adaptive power factor controller, IEEE tranction on energy conservation,
Vol. EC-2, No. 4, alce 1987.
[13] Sharkawi, S. S. Vankuta, G. Andexler, Mingliang chen and Tony Huang,
"Reactive Power Compensation", us patent No. 5, 134, 356 July 28,
1992.
[14] Bradley, J. A. Turner, D. S. Krchbial, "Lighting impuler test on adaptive
power factor controller", US Department of Engg-Bonneville power
administration report No. ERJ 83-82, Sept. 23, 1983.
[15] S. Cherulaupalli, H. E. Orton, "Adaptive power factor controller"
powertect Enc. Project No. 148-88, No. 1988.
[16] M. A. EI Sharkawi Et. al., "Development and field testing of adaptive
flicker control for 15 KV systems", paper number 94 sm 453-1 PWRD,
PES summer meeting, San Fransco, July 25-28, 1994.
[17] Sharkawi, S. S. Vankuta, G. Andexler, Mingliang chen and Tony Huang,
"Reactive Power Compensation", us patent No. 5, 134, 356 July 28,
1992.
[18] Bradley, J. A. Turner, D. S. Krchbial, "Lighting impuler test on adaptive
power factor controller", US Department of Engg-Bonneville power
administration report No. ERJ 83-82, Sept. 23, 1983.
[19] S. Cherulaupalli, H. E. Orton, "Adaptive power factor controller"
powertect Enc. Project No. 148-88, No. 1988.
[20] Paul, S. Basu, R. Mondal, "A Microcomputer Controller static var
compensator for power system laboratory experinemnts", IEEE
transaction on power systems. Vol. 7, No. 1, Feb. 1992, p. 371-376.
[21] A Exporito, F. Varquez, C. Mitchell, "Microprocessor based control of a
SVC for optimal load compensation", IEEE Transactions on power
delivery, Vol. 7 No. 2, April 1992.
[22] Hiyama, W. Hubbi, T. Ortmeyer, "Fuzzy logic control scheme with
variable geiin for static var comepnsator to enhance power system
stability", IEEE transactions on power systems, Vol. 14, 1 Feb. 1999,
P186-191.
[1] Hammad and B. Roesle, "New roles for static Var compensators in
transmission system", Brown Boveri Rev., Vol. 73, pp 314-320, Jun.
1986.
[2] J. Kearly et. al., "Microprocessor controlled reactive power compensator
for loss reduction in Rural Distribution Feeders", IEEE Transactions on
power delivery, Vol. 6, No. 4. October 1991, pp. 1848-1855.
[3] Narain G. Hingorani and L. Gyugyi, "Understanding FACTS" IEEE
Press.
[4] K. Stahllleopf, M. Wichelm, "Tighter Controls for Busier System",
IEEE Spectrum, April 1977, P 49-52.
[5] J. Grahm, "Transient stability enhancement using Static Var
Compensation", Wart Verginia University, Thesis, 378, 3543 Engg.
G76tc2, Oct. 1995.
[6] L. Gyugyi, R. A. otto, T. H. Putman, "Principles and Application of
Static Thyristor Controlled Shunt Compensations", IEEE Transaction on
Power Apparatus and Systems", Vol. PAS 97, No. 51978, pp 1935-
1945.
[7] Celli, F. Pilo, S. B. Tennakoon, "Voltage Regulation on 25 KV A. C.
Railway Systems by Using Thyristor Switched Capacitors", 0-7803-
6499-6/00 2000 IEEE.
[8] Edwards, K. Mattern, E. Stacey, P. Nannery and J. Gubernick,
"Advanced static Var generator employing GTO thyristors", IEEE
Trans. Power Del. VOl. 3, No. 4, pp1622-1627, Oct. 1988.
[9] M. F. Iizarry, Silvestrini, PREDA mitigation of back to back capacitor
switching transients on distribution circuits, San Juan PR00936.
[10] Turan Gonen, "Electric power distribution system engineering", CRC
press, 2nd edition.
[11] M. EI. Sharkawi, T. Williams, N. Buller, "An Adaptive Power Factor
Controller for Three Phase Induction Generator", IEEE tranction on
Power App and Systems, Vol. PAS 104, No. 7, July 1985, pp1825-1831.
[12] EI. Sharkawi, N. Buller, R. Yinger, "Development and Field testing of
adaptive power factor controller, IEEE tranction on energy conservation,
Vol. EC-2, No. 4, alce 1987.
[13] Sharkawi, S. S. Vankuta, G. Andexler, Mingliang chen and Tony Huang,
"Reactive Power Compensation", us patent No. 5, 134, 356 July 28,
1992.
[14] Bradley, J. A. Turner, D. S. Krchbial, "Lighting impuler test on adaptive
power factor controller", US Department of Engg-Bonneville power
administration report No. ERJ 83-82, Sept. 23, 1983.
[15] S. Cherulaupalli, H. E. Orton, "Adaptive power factor controller"
powertect Enc. Project No. 148-88, No. 1988.
[16] M. A. EI Sharkawi Et. al., "Development and field testing of adaptive
flicker control for 15 KV systems", paper number 94 sm 453-1 PWRD,
PES summer meeting, San Fransco, July 25-28, 1994.
[17] Sharkawi, S. S. Vankuta, G. Andexler, Mingliang chen and Tony Huang,
"Reactive Power Compensation", us patent No. 5, 134, 356 July 28,
1992.
[18] Bradley, J. A. Turner, D. S. Krchbial, "Lighting impuler test on adaptive
power factor controller", US Department of Engg-Bonneville power
administration report No. ERJ 83-82, Sept. 23, 1983.
[19] S. Cherulaupalli, H. E. Orton, "Adaptive power factor controller"
powertect Enc. Project No. 148-88, No. 1988.
[20] Paul, S. Basu, R. Mondal, "A Microcomputer Controller static var
compensator for power system laboratory experinemnts", IEEE
transaction on power systems. Vol. 7, No. 1, Feb. 1992, p. 371-376.
[21] A Exporito, F. Varquez, C. Mitchell, "Microprocessor based control of a
SVC for optimal load compensation", IEEE Transactions on power
delivery, Vol. 7 No. 2, April 1992.
[22] Hiyama, W. Hubbi, T. Ortmeyer, "Fuzzy logic control scheme with
variable geiin for static var comepnsator to enhance power system
stability", IEEE transactions on power systems, Vol. 14, 1 Feb. 1999,
P186-191.
@article{"International Journal of Information, Control and Computer Sciences:55963", author = "U. Gudaru and D. R. Patil", title = "An Innovative Transient Free Adaptive SVC in Stepless Mode of Control", abstract = "Electrical distribution systems are incurring large losses as the loads are wide spread, inadequate reactive power compensation facilities and their improper control. A comprehensive static VAR compensator consisting of capacitor bank in five binary sequential steps in conjunction with a thyristor controlled reactor of smallest step size is employed in the investigative work. The work deals with the performance evaluation through analytical studies and practical implementation on an existing system. A fast acting error adaptive controller is developed suitable both for contactor and thyristor switched capacitors. The switching operations achieved are transient free, practically no need to provide inrush current limiting reactors, TCR size minimum providing small percentages of nontriplen harmonics, facilitates stepless variation of reactive power depending on load requirement so as maintain power factor near unity always. It is elegant, closed loop microcontroller system having the features of self regulation in adaptive mode for automatic adjustment. It is successfully tested on a distribution transformer of three phase 50 Hz, Dy11, 11KV/440V, 125 KVA capacity and the functional feasibility and technical soundness are established. The controller developed is new, adaptable to both LT & HT systems and practically established to be giving reliable performance.
", keywords = "Binary Sequential switched capacitor bank, TCR,
Nontriplen harmonics, step less Q control, transient free", volume = "5", number = "5", pages = "461-8", }
