COMBINED SUBOPTIMAL EXCITATION CONTROL AND GOVERNING OF AC TURBOGENERATORS USING DYNAMIC SENSITIVITY ANALYSIS

Sensitivity equations for a nonlinear model of a power system incorporating combined excitation and steam-flow control have been used to produce suboptimal controllers incorporating linear combinations of state feedback to both the excitation and the governing system. Relevant sensitivity functions have been used to illustrate the effects of changes in both the state feedbacks and in system operating conditions. The separate main contributions of excitation control and governing in improving systems transient behavior are discussed. it is shown that acceptable suboptimal controllers can be obtained employing acceleration feedback acting alone in the steam-flow controller.