Robust H∞ Control design and dynamic performance analysis of an Isolated Diesel-Generation unit

Abstract

In this paper, the voltage and frequency control of an isolated synchronous generator, driven by diesel engine, is developed using the H approach. This has been advantage of maintaining constant terminal voltage and frequency irrespective of load variations. Two closed loops are available for the H control. The first loop is dedicated for regulating the terminal voltage of the synchronous generator to a set point by controlling the field voltage of the synchronous generator. The second loop is designed to control the rotor shaft speed via adjusting the mechanical input power to the generator from diesel engine. The H control design problem is described and formulated in standard form with emphasis on the selection of the weighting function that reflects robustness and performance goals. The proposed system has the advantages of robustness against model uncertainties and external disturbances, fast response and the ability to reject noise. The robustness of the diesel generation scheme has been certified through step changes in load impedance. Simulation results show the evaluated of the proposed H control scheme against system variation.