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Unified power-flow control concept for flexible AC transmission systems

Unified power-flow control concept for flexible AC transmission systems

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© The Institution of Electrical Engineers
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The abstract of the paper is to outline the technical and economical factors which characterise the uniform, all solid-state power-flow controller approach for real-time controlled, flex ible AC transmission systems.The unified power-flow controller in its general form can provide simultaneous, real-time control of all basic power system parameters (transmission voltage, impedance, and phase angle), or any combinations thereof, determining the transmitted power. The parameters selected for control can be changed without hardware alterations, e.g. the function of the controller can be changed from that of a phase-shifter to that of a series line compensator, or vice versa, with or without additional terminal voltage regulation and shunt VAr compensation, to adapt to particular short term contingencies or future system modifications.

Inspec keywords: load flow; power system control; power control

Other keywords: series line compensator; economic factors; transmission voltage; phase angle; flexible AC transmission systems; shunt VAr compensation; impedance; power system parameters; unified power-flow controller; solid-state power-flow controller; terminal voltage regulation; phase-shifter; real-time control

Subjects: Control of electric power systems; a.c. transmission; Power system management, operation and economics; Power and energy control

References

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      • L. Gyugyi . Reactive power generation and control by Thyristor circuits. IEEE Trans. Ind. Appl. , 5
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      • Ewart, D.N.: `Flexible AC transmission systems (FACTS) scoping study', EL-6943, EPRI Report, 1990.
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      • Christl, N.: `Advanced series compensation with variable impedance', EPRI Workshop on FACTS, November 1990, Cincinnati, Ohio, USA.
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      • N.G. Hingorani . High power electronics and flexible AC trans mission system. IEEE Power Eng. Rev.
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      • : `Static VAr compensators', Working Group 38-01, CIGRE, 1986, Task Force No. 2 on SVC.
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      • Maliszewski, R.M.: `Power flow in highly integrated transmission network', Paper No. 37-0303, CIGRE, 1990.
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      • Gyugyi, L.: `Advanced static VAr compensator using gate turn-off thyristors for utility applications', Paper No. 23-203, CIGRE, 1990.
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      • Wood, P.: `Study of improved load tap-changing for transformers and phase-angle regulators', EL-6079, EPRI Report, 1988, Project 2763-1.
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