Two-level optimal stabilization in multi-machine power systems

The control signals needed for the optimal stabilization of an interconnected multi-machine system are obtained using a two-level control strategy. At the lower level, local control signals are derived assuming no interaction between different machines. Then a global control signal is generated at a higher level to minimize the effect of interactions. Computer simulation of a real power system shows that the stability of the system may be enhanced substantially by adopting the two-level scheme. Response of the system with an integrated control scheme is included for comparative analysis.