AUTHORS: Mohamed Zellagui, Heba Ahmed Hassan

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ABSTRACT: A newly developed AC link converter based series compensation is a recent series Flexible Alternating Current Transmission System (FACTS) controller. The Pulse Width Modulated based Series Compensator (PWMSC) exploits the concept of the variable series reactance compensation which can modulate the impedance of a distribution line through applying a variation to the duty cycle (D) of a train of pulses with fixed frequency. This paper proposes a new approach for the calculation of short-circuit parameters in the presence of PWMSC. Using PWMSC results in an improvement of the system performance as it provides virtual compensation of distribution line impedance by injecting controllable apparent reactance in series with the distribution line. This work studies the impact of fault resistance (RF) on the fault current calculations in case of a ground fault and a fixed fault location. The case study is for a medium voltage (MV) Algerian distribution line which is compensated by PWMSC in the 30 kV Algerian distribution power network. The analysis is based on symmetrical components method which involves the calculations of symmetrical components of currents and voltages, without and with PWMSC in both cases of maximum and minimum duty cycle value for capacitive and inductive modes. The paper presents theoretical analysis for the case study followed by simulation results which both reflect the improvement of system performance when PWMSC is deployed

KEYWORDS: Pulse Width Modulated Series Compensator, Duty Cycle, Power System, Distribution Line, Short-Circuit Calculations, Ground Fault, Symmetrical Components Method

REFERENCES:

[1] X. P. Zhang, C. Rehtanz, and B. Pal, Flexible AC Transmission Systems: Modelling and Control, published by Springer, UK, 2012.

[2] Y. Hase, Handbook of Power Systems Engineering with Power Electronics Applications, 2 nd Edition, published by John Wiley & Sons, USA, 2013.

[3] L. A. C. Lopes, and G. Joos, “Pulse Width Modulated Capacitor for Series Compensation”, IEEE Transactions on Power Electronics, Vol. 16, No. 2, pp. 167-174, 2001.

[4] G. Venkataramanan, B. K. Johnson, “Pulse Width Modulated Series Compensator”, IEE Proceedings - Generation, Transmission and Distribution, Vol. 149, No. 1, pp. 71-75, 2002.

[5] G. Venkataramanan, “Three-Phase Vector Switching Converters for Power Flow Control”, IEE Proceedings - Electric Power Applications, Vol. 151, No. 3, pp. 321-333, 2004.

[6] F. Mancilla-David, S. Bhattacharya, and G. Venkataramanan, “A Comparative Evaluation of Series Power-Flow Controllers using DC and AC Link Converters”, IEEE Transactions on Power Delivery, Vol. 23, No. 2, pp.985-996, 2008.

[7] J. M. Ramirez, J. M. Gonzalez, and M. L. Crow, “Steady State Formulation of FACTS Devices based on AC/AC Converters”, IEE Proceedings - Electric Power Applications, Vol. 1, No. 4, pp. 619-631, 2007.

[8] P. M. Anderson, and R. G. Farmer, Series Compensation of Power Systems, published by PBLSH Inc. Publisher, USA, 1996.

[9] K. H. Chu, and C. Pollock, “PWM-Controlled Series Compensation with Low Harmonic Distortion”, IEE Proceedings - Generation, Transmission and Distribution, Vol. 144, No. 6, pp. 555-563, 1997.

[10] A. Safari, H. A. Shayanfar, and A. Kazemi, “Optimal Location of PWM based Series Compensator in a Power System”, International Journal of Electrical Power and Energy Systems, Vol. 51, pp. 127-133, 2013.

[11] A. Safari, H. A. Shayanfar, and A. Kazemi, “Robust PWMSC Damping Controller Tuning on the Augmented Lagrangian PSO Algorithm”, IEEE Transactions on Power Systems, Vol. 28, No. 4, pp. 4665-4673, 2013.

[12] A. Safari, H. A. Shayanfar, and A. Kazemi, “A Novel Current Injection Model of PWMSC for Control and Analysis of Power System Stability”, Serbian Journal of Electrical Engineering, Vol. 10, No. 2, pp. 349-364, 2013.

[13] A. Safari, H. A. Shayanfar, A. Kazemi, and H. Shayeghi, “Dynamic Modeling of PWM-Based AC Link Series Compensator”, Arabian Journal for Science and Engineering, Vol. 39, No. 3, pp. 1971-1981, 2014.

[14] A. Safari, H. A. Shayanfar, H. Shayeghi, and A. Kazemi, “PWMSC Controller Design for Damping Electromechanical Oscillations”, Automatika, Vol. 55, No. 2, pp. 207-215, 2014.

[15] N. D. Tleis, Power Systems Modelling and Fault Analysis - Theory and Practice, Published by Elsevier Limited, United Kingdom, 2008.

[16] Group Sonelgaz, Statistics of Faults on Algerian MV Distribution Power Systems, Algerian Company of Distribution, SDE Constantine, Algeria, January 2015.

[17] J. C. Rosas-Caro, F. Mancilla-David, J. M. Ramirez-Arredondo, and A. M. Bakir, “TwoSwitch Three-Phase AC Link Dynamic Voltage Restorer”, IET Power Electronics, Vol. 5, No. 9, pp. 1754-1763, 2012.

[18] J. Kimball, P. Krein, and K. Cahill, “Modeling of Capacitor Impedance in Switching Converters”, IEEE Power Electronics Letters, Vol. 3, No. 4, pp. 136-140, 2005.

[19] J. Schlabbach, Short-Circuit Currents, second edition, published by Institution of Engineering and Technology (IET), London, United Kingdom, June 2008.

[20] M. Zellagui, R. Benabid, A. Chaghi, and M. Boudour, “Impact of GCSC on IDMT Directional Overcurrent Relay in the Presence of Phase to Earth Fault”, Serbian Journal of Electrical Engineering, Vol. 10, No. 3, pp. 381-398, 2013.

[21] J. Lewis Blackburn, and A. F. Sleva, Symmetrical Components for Power Systems Engineering, 2nd edition, published by CRC press, London - United Kingdom, June 2011.

[22] M. Zellagui, H. Hassan, and A. Chaghi, “ShortCircuit Calculations for a Transmission Line in the Algerian Power Network Compensated by Thyristor Controlled Voltage Regulator”, Journal of Electrical and Electronics Engineering, Vol. 7, No. 2, pp. 43-48, 2014.

[23] M. Zellagui, and A. Chaghi, “Impact of TCSC on Measured Impedance by MHO Distance Relay on 400 kV Algerian Transmission Line in Presence of Phase to Earth Fault”, Journal of Electrical Systems (JES), Vol. 8, No. 3, pp. 273-291, 2012.

[24] M. Zellagui, and A. Chaghi, “Impact of Apparent Reactance Injected by TCSR on Distance Relay in Presence Phase to Earth Fault”, Advances in Electrical and Electronic Engineering (AEEE), Vol. 11, No. 3, pp. 156-168, 2013.

[25] M. Zellagui, H.A. Hassan, and A. Chaghi, “Effect of TCVR Controlled Voltage on ShortCircuit Calculations in Case of Ground Fault in the Algerian Network”, International Journal of Control and Automation (IJCA), Vol. 8, No. 1, pp. 125-138, 2015.

[26] Sonelgaz Group, “Topology of Constantine MV Distribution Power Systems”, Algerian Company of Distribution Electricity, SDE, Constantine, Algeria, 2015.