Experimental results on the implementation of an optimal control for synchronous machines

This paper records the experimental results on the implementation of optimal controllers for synchronous machines based on nonlinear and linear system models. First, a method is developed for synthesizing a closed - loop optimal control for the case of a non-linear machine model. The validity of this optimal control is then established by implementing it on a micro - machine connected to a short transmission line and driven by an armature-controlled d.c. motor. Comparison of test results with those of digital simulation demonstrate the practical usefulness of optimal controllers in improving synchronous machine transient response. Experimental results are presented to show that while optimal controllers based on a linear model perform quite well for small disturbances, those based on a nonlinear model yield a better response for large disturbances. Several other factors related to optimal control design, such as the improvement of transient response, effect of various parameters on optimal performance, coice of order for system model etc. are also discussed.