Multi-input multi-output self-tuning control of a turbine generator

Power system stability is one of the most important considerations in turbine generator control. Traditionally, efforts to improve transient performance of a turbine generator have been concentrated only on excitation control. Although a significant enhancement in the system damping can be obtained through excitation control, there are limits to which improvements in the stability limit can be achieved by this means. The use of a power system stabiliser to derive a supplementary stabilising signal which acts through the AVR is also subject to such limits. Since the governor gives a second input, multivariable control can therefore be considered for stability improvement. This is achieved by considering two co-ordinated control loops to optimise the improvement in the stability of the system.