Application of Decentralised Sliding Mode Control to Multimachine Power Systems

This chapter provides a decentralised strategy for the excitation control problem of multimachine power systems formed from an interconnected set of lower order systems through a network transmission. Both mismatched uncertainties in the interconnections and parametric uncertainties in the direct axis transient short circuit time constants, which affect the subsystem input distribution matrix, are considered. The proposed approach can deal with interconnection terms and parametric disturbances with large magnitude. The results obtained hold in a large region of operation if the control gain is high enough. This allows the operating point of the multimachine power system to vary to satisfy different load demands. Simulations on a three-machine power system are presented.