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Hydroelectric power stations and plants

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  • Electrical and electronic engineering [2]
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  • 1983 [2]

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Automatic generation control of an interconnected hydrothermal system in continuous and discrete modes considering generation rate constraints
Author(s): J. Nanda, M.L. Kothari, P.S. Satsang
Source: IEE Proceedings D (Control Theory and Applications), Volume 130, Issue 1, 1983 , p. 17 - 27
Type: Article
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The paper deals with some aspects of automatic generation control of the two-area hydrothermal system provided with classical controllers. A comprehensive procedure for continuous-and discrete-mode optimisation of integral controllers using an integral squared error criterion is suggested. Investigations reveal that the optimal integral gains achieved through continuous-mode analysis are totally unacceptable in the discrete mode for the sampling periods used in practice. Moreover, for all practical purposes, the optimum integral gains in the discrete mode can be achieved by neglecting the generation rate constraints from the mathematical model, in contrast to the case in the continuous mode. Analysis also highlights significant differences in the dynamic performance of the hydrothermal system due to step-load perturbation in either of the areas. An attempt is also made to recommend an optimum sampling period.

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Engineering studies for Itaipu converter station design
Author(s): C.A.O. Peixoto, S.O. Frontin, J.A. Jardini
Source: IEE Proceedings C (Generation, Transmission and Distribution), Volume 130, Issue 1, 1983 , p. 41 - 50
Type: Article
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The paper presents a discussion on some of the engineering studies performed to determine the design parameters of the Itaipu convertor stations. The following studies are discussed: steady-state conditions, reactive-power compensation, insulation co-ordination and arrester protective scheme, current stresses, system stability, main characteristics of the master control, AC and DC filter and DC line resonance. For each of these study areas, the paper gives a summary of the study methodology used, indicates the main study results, and includes some of the system problems encountered and the solution adopted.

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