Improvement of power system stability by crosscoupling generator control systems

It is proposed that power system stability can be improved by controlling the dynamic response of generators so that they act sympathetically during a transient disturbance. This is shown to be valid theoretically for a simple system consisting of two identical machines fitted with power system stabilisers, the control signals from one machine being used to stabilise the other and vice versa. The extent of the improvements in system response to be expected from such an arrangement in practice is investigated using a dynamic model consisting of two dissimilar machines linked by transmission lines. It is found that the effectiveness of the machine stabilisers is doubled by crosscoupling control signals