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Gharehpetian, G. B.
- Studying Voltage Stability in Power System Considering Load Dynamics
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Authors
Affiliations
1 Department of Electrical Engineering, Islamic Azad University, Takestan Branch, Takestan, IR
2 Electrical Engineering Department, Amirkabir University of Technology, Tehran, IR
1 Department of Electrical Engineering, Islamic Azad University, Takestan Branch, Takestan, IR
2 Electrical Engineering Department, Amirkabir University of Technology, Tehran, IR
Source
Indian Journal of Science and Technology, Vol 6, No 11 (2013), Pagination: 5487–5494Abstract
This paper investigates on-load tap changer OLTC effect on voltage stability. Chaos theory used in this analysis is via the calculation of the maximum power transmission. Resulted chaotic behavior is exhibited by singular induced bifurcation which clearly shows the voltage stability of the power system with OLTC from a singular induced bifurcation point of view. The paper is organized as follows: 1) increasing in the maximum reactive power via increasing the ratio of OLTC and the possibility of voltage collapse decrease under the same load command. 2) Noting that the voltage instability is directly affected by the load characteristics, shown via the effect of OLTC on the voltage instability under different static load models. 3) Studying voltage stability in state space and the effects of the generator excitation current limit, the OLTC and load dynamics on voltage collapse. In addition, a small-disturbance voltage stability region of a power system is constructed. The voltage stability of the system is determined by the dynamic characteristics of both the OLTC and the load.Keywords
On Load Tap Changer, Voltage Stability, State Space, Bifurcation DiagramFull Text
References
- Taylor C W (1994). Power System Voltage Stability, Appendices:Voltage stability and the power flow problem, McGraw-Hill Ryerson, Limited, Technology & Engineering, 200–232.
- Vaithianathan V R, Heinz S C et al. (1995). Dynamics of large constrainted nonlinear systems-a taxonomy theory, Proceedings of the IEEE, vol 83(11), 1530–1561.
- Ohtsuki H, Yokoyama A et al. (1990). Reverse action of on-load tap changer in association with voltage collapse, IEEE Transactions on Power Systems, vol 6(1), 300–306.
- Liu C, and Vu K T (1989). Analysis of tap-Changer dynamics and construction of voltage stability regions, IEEE Transactions on circuits and systems, vol 36(4), 575–590.
- Zhu T X, Tso S K et al. (2000). An investigation into the OLTC effects on voltage collapse, IEEE Transactions Power Systems, vol 15(2), 515–521.
- Kang P, and Birtwhistle D (2001). Condition monitoring of power transformer on-load tap-changers, Part 2: Detection of ageing from vibration signatures, IEE Proceedings - Generation Transmission and Distribu-tion, vol 148(4), 307–311.
- Hong Y-Y and Yang Y-L (1998). Evaluation of control sequence for improving voltage stability in power systems, Electric Power Systems Research, vol 47(3), 205–213.
- Rivas E, Burgos J C et al. (2009). Condition assessment of power OLTC by vibration analysis using wavelet transform, IEEE Transactions on Power Delivery, vol 24(2), 687–694.
- Rivas E, Burgos J C et al. (2010). Vibration analysis using envelope wavelet for detecting faults in the OLTC tap selector, IEEE Transactions on Power Delivery, vol 25(3), 1629–1636.
- Liu C C, and Vu K T (1989). Analysis of tap-changer dynamics and construction of voltage stability regions, IEEE Transactions on Circuits and Systems, vol 36(4), 575–590.
- Vu K T, and Liu C C (1992). Shrinking stability regions and voltage collapse in power systems, IEEE Transactions on Circuits and Systems, vol 39(4), 271–289.
- Vu K T, and Liu C C (1990). Dynamic mechanisms of voltage collapse, Systems and Control Letters, vol 15, 329–338.
- Vancutsem T (1988). Dynamic and static aspects of voltage collapse, Proc. Engineering Foundation Conf. on Bulk Power System Voltage Phenomena: Voltage Security and Stability, Potosi (USA), 6.55–6.79.
- Ohtsuki H, Yokoyama A et al. (1991). Reverse action or on-load tap changer in association with voltage collapse, IEEE Transactions on Power Systems, vol 6(1), 300–306.
- Hill D J (1993). Nonlinear dynamic load models with recovery for voltage stability studies, IEEE Transactions on Power System, vol 8(1), 166–176.
- Xu W, and Mansour Y (1994). Voltage stability analysis using generic dynamic load models, IEEE Transactions on Power System, vol 9(1), 479–493.
- Analyzing the Effect of Wind Farm to Improve Transmission Line Stability in Contingencies
Abstract Views :263 |
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Authors
Affiliations
1 Amirkabir University of Technology, Tehran, IR
1 Amirkabir University of Technology, Tehran, IR
Source
Indian Journal of Science and Technology, Vol 8, No 11 (2015), Pagination:Abstract
Todays, contingency analysis is being used to predict the effect of line outages in power system operation. This analysis is mostly offline to predict the line outage effects on the blackout of power system. To investigate the grid’s sensitivity to each line outage, power flow equations are analyzed. The ranking process of line outage and their effects on the other lines overloading is done by calculating an index (PIMVA) which represents the sum of deviations of each line power from the maximum rating of the line. Furthermore the effect of wind farm connection to the grid is investigated to improve the sensitivity of the grid in line outage contingencies. The effectiveness of the method is tested on IEEE-14 Bus standard benchmark. The simulations are done, using ETAP software.Keywords
Contingency, PV Bus, PQ Bus, Slack Bus, Wind FarmFull Text
- Effect of the Series Resonance LC Tank on the Mitigation of Fault Current in Radial Distribution Networks
Abstract Views :182 |
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Authors
Affiliations
1 Electrical Engineering Department, Islamic Azad University, Takestan Branch, Takestan, Iran
2 Electrical Engineering Department, Aeronautical University of Science and Technology, Tehran, Iran
3 Electrical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
1 Electrical Engineering Department, Islamic Azad University, Takestan Branch, Takestan, Iran
2 Electrical Engineering Department, Aeronautical University of Science and Technology, Tehran, Iran
3 Electrical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Source
Indian Journal of Science and Technology, Vol 9, No 7 (2016), Pagination:Abstract
This paper proposes a novel Fault Current Limiter (FCL) for the application on power systems to control voltage sags at the Point of Common Coupling (PCC) during faults. This new FCL is a resonance transformer, whose primary side is connected to a series capacitor and transmission line. Also, the secondary side of the transformer is switched by a semiconductor device to change the impedance of the primary side of the transformer. The main control component is a fast-closing switch connected in parallel with the secondary side of the transformer, which is driven by the power electronic switch. It can respond within 1 msec. When a fault occurs, the switch closes and bypasses the transformer secondary side and fault current is limited by the reactor. So, by increasing the existing resonant frequency, the fault current is limited. The simulated and experimental results show that it is feasible to develop the FCL with low cost and high reliability. The experimental results show the capability of the proposed FCL, tooKeywords
Fault Current Limiter (FCL), Point of Common Coupling (PCC), Power Quality, Resonance TransformerFull Text
- Enhancement of Power System Oscillation Damping using Fuzzy Inference System based Coordinated Design of SSSC Controllers
Abstract Views :223 |
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Authors
Reza Sharifi
1,
Reza Khamooshi
1,
Hamid Radmanesh
2,
G. B. Gharehpetian
1,
Seyyed Hamid Fathi
1,
Javad S. H. Moghani
1
Affiliations
1 Electrical Engineering Department, Amirkabir University of Technology, Tehran, IR
2 Electrical Engineering Department, Aeronautical University of Science and Technology, Tehran, IR
1 Electrical Engineering Department, Amirkabir University of Technology, Tehran, IR
2 Electrical Engineering Department, Aeronautical University of Science and Technology, Tehran, IR
Source
Indian Journal of Science and Technology, Vol 9, No 17 (2016), Pagination:Abstract
Nowadays, Flexible AC Transmission System (FACTS) devices are widely used in different power systems. As the application of these technologies increases, possible interferences in operational tasks of controllers and inappropriate oscillations in different situations like fault and post-fault conditions make the coordination of their controllers inevitable. In this paper, a Fuzzy Inference System (FIS) based coordinated design of Static Synchronous Series Compensator (SSSC) controllers is presented and discussed. The main advantages of the proposed scheme are good damping and overshoot reduction of oscillations and thereby improving power oscillations damping. The Trajectory Sensitivities (TS) analysis, which is a time domain method to evaluate the stability of a system in the presence of disturbances, is also used to assess the validity of this coordinated controller design method. The comparison of simulation results with the conventional Proportional-Integral-Derivative (PID) controller based system validates the effectiveness of this design.Keywords
Coordinated Design, Fuzzy Inference System, Flexible AC Transmission System, Power System Oscillations, Static Synchronous Series Compensator.Full Text