Design of robust excitation controllers for synchronous generators using the spectral and control-canonical-form methods with output feedback

✍ Scribed by D.P. Papadopoulos; D.V. Bandekas; J.R. Smith

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 909 KB
• Volume: 330
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(93)90011-i

✦ Synopsis

The linearized model&g of a synchronous generator with exciter, along with a powerful model order-reduction method and two eficient pole-placing algebraic control methods (i.e. the spectral and control-canonical-form (CCF) using state and/or output feedback) have been presented in systematic and concise form. They are used to design a robust excitation controller of an 87.5 kVA synchronous generator with a conventional excitation system supplying power to the electric utility system through a transformer and a transmission line. The excitation controller design is based on the obtained reduced 4th-order system model of the developed single-input multiple-output (SIMO) 8 th-order, linearized (about a nominal operating point), time-invariant state-space open-loop system model. It was tested at several operating points in the over-and under-excitation operating regions of the generator. All the designed systems with the above excitation controller (closed-loop system models) were tested and displayed sign$cantly improved dynamic stability characteristics and overall system perjormance with reference to those of the open-loop system models. The proposed procedure for designing implementable robust excitation controllers is relatively simple to apply, as amply ver$ed by the example given and relevant system simulations.

Nomenclature

S load angle ifd field current zd, i, stator currents in d-and q-axis circuits, respectively i, generator terminal current vfd field voltage vd, v, stator voltages in d-and q-axis circuits, respectively