Application of svc for voltage control in wind farm power system 2

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Application of svc for voltage control in wind farm power system 2

  1. 1. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 95 APPLICATION OF SVC FOR VOLTAGE CONTROL IN WIND FARM POWER SYSTEM Dr. M. P. Sharma Devandra Saini AEN, RVPNL, Jaipur Asst. Prof., EE Deptt., SIT, Jaipur Swati Harsh Sarfaraz Nawaz Asst. Prof., EE Deptt.,AICE, Jaipur Associate Prof. Deptt., SKIT, Jaipur ABSTRACT Most of wind power plants are installed far away from load centers, hence require long EHV transmission lines for evacuation system for pooling the power and transmitting to far off load centers. Wind Power Generation is infirm and variable subject to vagaries of nature. Due to large variations in wind power generation, power flows on transmission lines are also vary and accordingly there is a wide variation in power transmission system voltage from minimum 0.8 pu to maximum 1.20 pu. Due to low & high power system voltages, transmission lines are tripped resulting constrained in wind power evacuation. In this paper Static Var Compensator is proposed at wind power plants penetrated power system. In this paper simulation studies have been carried out to validate the effectiveness of the SVC for voltage control with the variation in wind power generation. Case studies are carried out on 18-bus Rajasthan power system to demonstrate the performance of the SVC during high and low wind power generation conditions. Wind power plants penetrated part of Rajasthan power system has been modeled using Mi-Power power system analysis software designed by the M/s PRDC Bangalore. Results of tests conducted on the model system in various possible field conditions are presented and discussed. I. INTRODUCTION In Rajasthan, most of wind power plants are concentrated in western part i.e. Jaisalmer which is far away from load centers. As on 31-3-2013, total 2140 MW capacity wind power plants are installed in Jaisalmer area. For evacuation of wind power generation from Jaisalmer to load centers, 2 nos. 400 kV lines, 3 nos. 220 kV lines & 2 nos. 132 kV lines INTERNATIONAL JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY (IJEET) ISSN 0976 – 6545(Print) ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), pp. 95-114 © IAEME: www.iaeme.com/ijeet.asp Journal Impact Factor (2013): 5.5028 (Calculated by GISI) www.jifactor.com IJEET © I A E M E
  2. 2. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 96 have been constructed. There is a huge variations in wind generation i.e. variation is from zero to maximum generation. Variation in wind power generation on typical days is shown in following figures:- Fig-1: HOURLY AVERAGE WIND GENERATION for 15 March, 2013 Fig-2: HOURLY AVERAGE WIND GENERATION for 23 March, 2013
  3. 3. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 97 Fig-3: HOURLY AVERAGE WIND GENERATION for 10 April,2013 Fig-4: HOURLY AVERAGE WIND GENERATION for 15 April, 2013
  4. 4. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 98 Due to variation in wind power generation, power transmission voltage is fluctuated. Voltage fluctuations are mainly due to Long EHV transmission lines Lack of load in western Rajasthan Erratic variation in generation pattern Wind Generators do not provide the required VAR support Over-voltage causes over-fluxing in transformers resulting in tripping of transformers. Due to over voltages, transmission lines also tripped. With the help of FACTS devices, it is possible to regulate power system voltage with the variation of wind power generation. II. SVC AND POWER SYSTEM V-I CHARACTERISTICS SVC V-I Characteristic SVC composed of a controllable reactor and a fixed capacitor. The composite characteristic of SVC is derived by adding the individual characteristics of the components. SVC are defined by the slope reactance when the controlled voltage is within the control range. Fig 5: SVC V-I characteristics The V-I characteristics are described by the following three equations: Within control range (-Icmax ≤ Isvc ≤ ILmax ) V = Vref + XsL Isvc When V<Vmin , the SVC will reach its capacitive limit B= -Bcmax When Isvc>ILmax , the SVC will reach its inductive limit B= BLmax
  5. 5. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 99 Power System V-I Characteristic The system V-I characteristic is determined by considering the Thevenin equivalent circuit as viewed from the bus whose voltage is to be regulated by the SVC. The Thevenin impedance in Fig-6 is predominantly an inductive reactance. The corresponding bus voltage versus reactive current characteristic is shown in fig-7. Bus voltage increases linearly with capacitive current injection at bus and decreases linearly with inductive current injection at bus. Fig-8 shows the effect of source voltage on the V-I characteristic of the power system bus. and Fig-9 shows the system equivalent reactance on the V-I characteristic of the power system bus Fig-6 : Thevenin equivalent circuit of HVAC network Fig-7: Power system bus Voltage-Reactive current characteristic
  6. 6. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 100 Fig-8: Effect of varying source voltage on V-I characteristic of power system bus Fig-9: Effect of varying system reactance on V-I characteristic of power system bus Composite SVC-Power System V-I Characteristic The system characteristic may be expressed as V = Eth – Xth Is Where V = Power system bus voltage Is = Bus load current Eth = Source voltage Xth = System Thevenin reactance For inductive load current Is is positive and for capacitive load current Is is negative.
  7. 7. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 101 The SVC characteristic may be expressed as V = V0 + XSL Is Where V = Power system bus voltage Is = SVC current Vo = SVC reference voltage where net SVC current is zero XSL = SVC slope reactance For inductive SVC current Is is positive and for capacitive SVC current Is is negative. For voltage outside the control range, the ratio V/Is is determined by the ratings of the inductor and capacitor. The solution of SVC and power system characteristic equations graphically illustrated in figure 10. Three system characteristics are considered in the figure, corresponding to three values of the source voltage. The middle characteristic represents the nominal system conditions and is assummed to intersect the SVC characteristic at Point A where V = V0 and I = Is . If the system voltage increases by Eth , due to decrease of system load level, bus voltage V will increase to V1 without an SVC. With the SVC, the operating point moves to B, by absorbing inductive current I3. Therefore, SVC hold the voltage V3 instead of V1 without the SVC. Similarly if the system voltage decreases by Eth , due to increase of system load level, bus voltage V will decrease to V2 without an SVC. With the SVC, the operating point moves to C, by injecting capacitive current I4. Therefore, SVC hold the voltage V4 instead of V2 without the SVC. Fig10: Graphical solution of SVC operating point for given system conditions
  8. 8. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 102 III. RESPONSE OF SVC DURING LOW VOLTAGE AND HIGH WIND POWER GENERATION CONDITION SVC of (+)150/(-)150 MVAR capacity is connected at 400 kV GSS Jaisalmer through 400/33 kV transformer (Bus-19). Due to high wind power generation SVC reference voltage is set to 1.10 PU. The slope of SVC is 0.09. The purpose of connecting SVC at Bus number 19 is to regulate the voltage at bus number 2 i.e. Jaisalmer 400 kV bus with the increase in wind power generation. To demonstrate the effect of SVC on voltage and system losses, load flow studies have been carried out without and with (+)150/(-)150 MVAR SVC at Bus-19 for various wind power generation schedule. Following four cases have been considered in the load flow studies:- S. No. Particulars Connected capacity of wind power plants (MW) Net Wind Power Despatch (MW) Case-1 (45 % of IC) Case-2 (55 % of IC) Case-3 (65 % of IC) Case-4 (75 % of IC) 1 400 kV GSS Jaisalmer 1340 603 737 871 1005 2 220 kV GSS Amarsagar 760 342 408 494 570 3 132 kV GSS Jaisalmer 40 18 22 26 30 Total 2140 963 1177 1391 1605 OUTPUT OF LOAD FLOW STUDIES Case-1 : 45 % wind power generation of installed wind farms capacity Power plots of load flow study without SVC at Bus-19 is placed at fig-11A and Power plots of LFS with (+)150/(-)150 MVAR SVC at Bus-19 while other conditions remains unchanged is placed at fig-11B. Case-2: 55 % wind power generation of installed wind farms capacity Power plots of load flow study without SVC at Bus-19 is placed at fig-12A and Power plots of LFS with (+)150/(-)150 MVAR SVC at Bus-19 while other conditions remains unchanged is placed at fig-12B. Case-3: 65 % wind power generation of installed wind farms capacity Power plots of load flow study without SVC at Bus-19 is placed at fig-13A and Power plots of LFS with (+)150/(-)150 MVAR SVC at Bus-19 while other conditions remains unchanged is placed at fig-13B.
  9. 9. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 103 Case-4: 75 % wind power generation of installed wind farms capacity Power plots of load flow study without SVC at 400 kV GSS Jaisalmer is placed at fig-14A and Power plots of LFS with (+)150/(-)150 MVAR SVC at Bus-19 while other conditions remains unchanged is placed at fig-14B. EFFECT OF SVC ON POWER SYSTEM VOLTAGE Power system voltage without and with SVC are tabulated in Table-1. With the increase of wind power generation, transmission voltages are decreased due to increase of power flow on transmission lines. With SVC fall in transmission voltages are much lesser than without SVC. Table-1: Bus voltages (kV) without and with SVC in high wind power generation condition S. No. Particulars Case-1 (45 % of IC) Case-2 (55 % of IC) Case-3 (65 % of IC) Case-4 (75 % of IC) Wind Power Generation (MW) 963 1177 1391 1605 A 400 kV bus voltage 1 400 kV GSS Jaisalmer Without SVC 401.48 396.19 388.46 377.40 With SVC 406.91 402.76 396.93 388..86 2 400 kV GSS Barmer Without SVC 402 398 392 384 With SVC 405 402 397 390 3 400 kV GSS Rajwest LTPS Without SVC 402 398 392 384 With SVC 405 401 397 390 B 220 kV bus voltage 1 400 kV GSS Jaisalmer Without SVC 221 217 213 206 With SVC 223 221 217 212 2 400 kV GSS Barmer Without SVC 219 216 212 205 With SVC 222 219 215 210 3 220 kV GSS Amarsagar Without SVC 219 216 211 204 With SVC 221 219 215 210 4 220 kV GSS Phalodi Without SVC 202 198 194 187 With SVC 203 200 196 191 5 220 kV GSS Tinwari Without SVC 205 203 202 199 With SVC 205 204 203 201 C 132 kV bus voltage 1 220 kV GSS Amarsagar Without SVC 131 129 126 122 With SVC 133 131 129 126 2 220 kV GSS Phalodi Without SVC 115 113 109 105 With SVC 116 114 111 107 3 220 kV GSS Tinwari Without SVC 119 118 117 116 With SVC 119 118 117 116 4 132 kV GSS Jaisalmer Without SVC 130 128 125 121 With SVC 131 130 128 126 D SVC Bus voltage Without SVC 33.97 33.52 32.87 31.93 With SVC 34.73 34.43 34.01 33.43 E MVAR loading on SVC (Capacitive) Without SVC - - - - With SVC 57 66 79 98
  10. 10. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 104 EFFECT OF SVC ON POWER TRANSMISSION LOSSES Power system voltage without and with SVC for various wind power generation schedules are tabulated in Table-2. Table-2: Power System Losses without and with SVC in high wind power generation condition S. No. Particulars Case-1 (45 % of IC) Case-2 (55 % of IC) Case-3 (65 % of IC) Case-4 (75 % of IC) 1 Wind Power Generation (MW) 963 1177 1391 1605 2 Without SVC Losses (MW) 31.10 43.71 60.14 82.62 3 With SVC Losses (MW) 30.63 42.88 58.30 78.06 Above tabulated data indicates that with SVC transmission losses are reduced due to increase of system voltage and decrease of reactive power flow on transmission lines. Fig.11A: Without SVC at Bus-19 (45 % i.e. 963 MW wind power generation)
  11. 11. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 105 Fig.11B: With (+) 150/(-)150 MVAR SVC at Bus-19 (45 % i.e. 963 MW wind power generation) Fig.12A: Without SVC at Bus-19 (55 % i.e. 1177 MW wind power generation)
  12. 12. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 106 Fig.12B: With (+) 150/(-)150 MVAR SVC at 400 kV GSS Jaisalmer (55 % i.e. 1177 MW wind power generation) Fig.13A: Without SVC at Bus-19 (65 % i.e. 1391 MW wind power generation)
  13. 13. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 107 Fig.13B: With (+) 150/(-)150 MVAR SVC at Bus-19 (65 % i.e. 1391 MW wind power generation) Fig.14A: With SVC at Bus-19 (75 % i.e. 1605 MW wind power generation)
  14. 14. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 108 Fig.14B: With (+) 150/(-)150 MVAR SVC at Bus-19 (75 % i.e. 1605 MW wind power generation) Fig.15: Bus-2 Voltage without and with SVC with variation in wind power generation
  15. 15. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 109 Fig.16: Loading (MVAR) on SVC with variation in wind power generation IV. EFFECT OF SVC DURING HIGH VOLTAGE AND LOW WIND POWER GENERATION CONDITION SVC of (+)150/(-)150 MVAR capacity is connected at 400 kV GSS Jaisalmer through 400/33 kV transformer (Bus-19). Due to low wind power generation SVC reference voltage is set to 0.90 PU. The slope of SVC is 0.09. The purpose of connecting SVC at Bus number 19 is to regulate the voltage at bus number 2 i.e. Jaisalmer 400 kV bus with the decrease in wind power generation. To demonstrate the effect of SVC on voltage load flow studies have been carried out without and with (+)150/(-)150 MVAR SVC at 400 kV GSS Jaisalmer for various wind power generation schedule. Following two cases have been considered in the load flow studies:- S. No. Particulars Connected capacity of wind power plants (MW) Net Wind Power Despatch (MW) Case-1 (35 % of IC) Case-2 (25 % of IC) 1 400 kV GSS Jaisalmer 1340 469 335 2 220 kV GSS Amarsagar 760 266 190 3 132 kV GSS Jaisalmer 40 14 10 Total 2140 749 535
  16. 16. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 110 OUTPUT OF LOAD FLOW STUDIES Case-1 : 35 % wind power generation of installed wind farms capacity Power plots of load flow study without SVC at Bus-19 is placed at fig-17A and Power plots of LFS with (+)150/(-)150 MVAR SVC at Bus-19 while other conditions remains unchanged is placed at fig-17B. Case-2: 25 % wind power generation of installed wind farms capacity Power plots of load flow study without SVC at Bus-19 is placed at fig-18A and Power plots of LFS with (+)150/(-)150 MVAR SVC at Bus-19 while other conditions remains unchanged is placed at fig-18B. EFFECT OF SVC ON POWER SYSTEM VOLTAGE Power system voltage without and with SVC are tabulated in Table-3. With the decrease of wind power generation, transmission voltages are increased due to decrease of power flow on transmission lines. With SVC rise in transmission voltages are less than without SVC. Table-3 : Bus voltages (kV) without and with SVC in low wind power generation condition S. No. Particulars Case-1 (35 % of IC) Case-2 (25 % of IC) Wind Power Generation (MW) 749 535 A 400 kV bus voltage 1 400 kV GSS Jaisalmer Without SVC 427.04 428.39 With SVC 412.80 414.14 2 400 kV GSS Barmer Without SVC 427 428 With SVC 419 420 3 400 kV GSS Rajwest LTPS Without SVC 426 428 With SVC 419 421 B 220 kV bus voltage 1 400 kV GSS Jaisalmer Without SVC 235 236 With SVC 228 228 2 400 kV GSS Barmer Without SVC 234 235 With SVC 228 229 3 220 kV GSS Amarsagar Without SVC 233 233 With SVC 226 227 4 220 kV GSS Phalodi Without SVC 218 219 With SVC 214 215 5 220 kV GSS Tinwari Without SVC 218 219 With SVC 217 218 C 132 kV bus voltage 1 220 kV GSS Amarsagar Without SVC 140 140 With SVC 136 136 2 220 kV GSS Phalodi Without SVC 125 126 With SVC 123 124 3 220 kV GSS Tinwari Without SVC 127 127 With SVC 126 127 4 132 kV GSS Jaisalmer Without SVC 139 139 With SVC 135 136 D SVC Bus voltage Without SVC 36.13 36.25 With SVC 34.11 34.21 E MVAR loading on SVC (Inductive) Without SVC - - With SVC 158 161
  17. 17. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 111 Fig.17A: Without SVC at Bus-19 (35 % i.e. 749 MW wind power generation) Fig.17B: With (+) 150/(-)150 MVAR SVC at Bus-19 (35 % i.e. 749 MW wind power generation)
  18. 18. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 112 Fig.18A: Without SVC at Bus-19 (25 % i.e. 535 MW wind power generation) Fig.18B: With (+) 150/(-)150 MVAR SVC at Bus-19 (25 % i.e. 535 MW wind power generation)
  19. 19. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 113 V. CONCLUSION Most of wind power plants are installed far away from load centers. Long EHV transmission lines are being constructed for evacuation of wind power generation up to load centers without planning reactive power management and voltage control. Reactive power management using shunt reactors and shunt capacitors is not successful in wind power plants penetrated power system due to large & sudden variation in wind power generation. SVC is able to regulate the power transmission voltage with the variation in wind power generation. With the help of Static Var Compensator high as well as low transmission voltages can be controlled. During high power system voltage, SVC absorb reactive power and function as shunt reactor and there is less rise in system voltage with SVC as compared to without SVC. During low power system voltage, SVC generates reactive power & function as shunt capacitor. Therefore, there is less drop in system voltage with SVC as compared without SVC. VI. REFERENCE [1]. N.G. Hingorani and L. Gyugy, Understanding FACTS, Concepts and Technology of Flexible AC Transmission System. New York: Inst. Elect. Electron. Eng., Inc., 2000. [2]. J. J. Paserba, D. J. Leonard, N.W. Miller, S. T. Naumann, M. G. Lauby, and F. P. Sener, “Coordination of a distribution level continuously controlled compensation device with existing substation equipment for long term var management,” IEEE Trans. Power Del., vol. 9, no. 2, pp.1034–1040, Apr. 1994. [3]. K. M. Son, K. S. Moon, S. K. Lee, and J. K. Park, “Coordination of an SVC with a ULTC reserving compensation margin for emergency control,” IEEE Trans. Power Del., vol. 15, no. 4, pp. 1193–1198, Oct. 2000. [4]. Task Force no. 2 on Static Var Compensators, Static Var Compensators (1986). [5]. IEEE Special Stability Controls Working Group, “Static var compensator models for power flow and dynamic performance simulation,” IEEE Trans. Power Syst., vol. 9, no. 1, pp. 229–240, Feb. 1994. [6]. R.A. Schlueter, ,A voltage stability security assessment method,” IEEE Trans. on Power Systems, vol. 13, no. 4, November 1998, pp. 1423- 1438. [7]. D. Jovcic, Pahalawaththa, N., Zavahir, M. & Hassan, H.A. (2003) “SVC Dynamic analytical Model”_ IEEE Trans. On Power Delivery, Vol. 18, No. 4, (October), pp. 1455 - 1461. [8]. FACTS Controllers in Power Transmission and Distribution By- K.R. Padiyar. [9] Ameer H. Abd and D.S.Chavan, “Impact of Wind Farm of Double-Fed Induction Generator (Dfig) on Voltage Quality”, International Journal of Electrical Engineering & Technology (IJEET), Volume 3, Issue 1, 2012, pp. 235 - 246, ISSN Print : 0976-6545, ISSN Online: 0976-6553. [10] Dr. M. P. Sharma and Sarfaraz Nawaz, “Understanding Operation of Shunt Capacitors and Oltc for Transmission Loss Reduction”, International Journal of Electrical Engineering & Technology (IJEET), Volume 4, Issue 2, 2013, pp. 344 - 357, ISSN Print : 0976-6545, ISSN Online: 0976-6553. [11] T. Nageswara Prasad, V. Chandra Jagan Mohan and Dr. V.C. Veera Reddy, “Shunt Compensator for Integration of Wind Farm to Polluted Distribution System”, International Journal of Electrical Engineering & Technology (IJEET), Volume 3, Issue 3, 2012, pp. 89 - 101, ISSN Print : 0976-6545, ISSN Online: 0976-6553.
  20. 20. International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 114 BIOGRAPHIES Dr. M. P. Sharma received the B.E. degree in Electrical Engineering in 1996 Govt. Engineering College, Kota, Rajasthan and M. E. degree in Power Systems in 2001 and Ph.D. degree in 2009 from Malaviya Regional Engineering College, Jaipur (Now name as MNIT). He is presently working as Assistant Engineer, Rajasthan Rajya Vidhyut Prasaran Nigam Ltd., Jaipur. He is involved in the system studies of Rajasthan power system for development of power transmission system in Rajasthan and planning of the power evacuation system for new power plants. His research interest includes Reactive Power Optimization, Power System Stability, reduction of T&D losses and protection of power system.(email: mahavir_sh@rediffmail.com) Devendra Saini received the B.Tech. degree in electrical engineering from Rajasthan Technical University, Kota, in 2011. He is currently pursuing the M.Tech.degree in Power System from the Jodhpur National University ,Jodhpur. He is currently an Assistant Professor at the Electrical Engi. Dept. Shankara Institute Of Technology , Jaipur ,Rajasthan. His research interests are in the areas of FACTS power system problems, controls and transient stability (email :devendrasaini786@gmail.com) Swati Harsh has received her B.E. degree from University of Rajasthan. She is currently working as Assistant professor in department of Electrical Engineering at Anand International College of Engineering. She is currently pursuing M.Tech. (Power System) from Swami Keshvanand Institute of Technology, Management and Gramothan (SKIT) (email: swatiharsh1st@gmail.com) Sarfaraz Nawaz has received his B.E. degree from University of Rajasthan and M.Tech. degree from MNIT, Jaipur. His research interests include power systems and power electronics. He is currently an Associate Professor of the Electrical Engg. Dept., Swami Keshvanand Institute of Technology, Management and Gramothan (SKIT) , Jaipur, Rajasthan. (email: eesarfaraz1983@rediffmail.com)

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