Distributed bounded integral control for multimachine power systems

In this paper, the problem of frequency control in multimachine power networks is investigated in a distributed manner. Taking as an example a cyber-physical architecture of the IEEE 68 bus, 16 machine power system, a new distributed bounded integral control (DiBIC) scheme is proposed to achieve frequency restoration to the rated value and power sharing among the 16 generators with only neighbour-to-neighbour communication, while maintaining the mechanical torque of each generator within predefined limits. The boundedness of the mechanical torque inputs is analytically proven independently of the distributed control tasks and without the need for saturation mechanisms that might lead the power system to instability. To verify the proposed DiBIC performance, the IEEE 68 bus network is simulated under a change of the load demand and tested under both the proposed and the conventional distributed integral control with saturation.