Optimization of Excitation Adjustment for Automatic Control of Alternators.

Document Type : Research Studies

Author

Electrical Power & Machine Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Abstract

To solve the problems associated with damping the electromechanical oscillation in electric power systems as well as to support the static stability there are many methods: one of them is the optimimum excitation for automatic control of alternator's (EACA). Improvement of EACA requires up-dating methods to operate the electric power stations at high efficiency. This paper presents a technique to achieve this improvement aim. In this technique; the electromechanical formulation of EACA is determined and it consequently depends on the following points: (i) electromechanical oscillation parameters; (i) sensitivity coefficients for changing the real parts of the system equations roots corresponding to the variation of stability coefficients; (iii) construction of an independent area for static stabilities which determines the EACA parameters. 
The suggested technique is applied to a system containing six power units feeding a ring power system. The ring system is composed of 220 kV transmission lines with different tapping loads. The obtained results show that, (i) EACA gives high equal damping oscillation of electromechanical system at various conditions; (ii) minimum computation time even in case of multi power units. The suggested technique gives the equality between the control area of stabilities and the stability degree of EACA.

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