Reduced H∞ load frequency controller in a deregulated electric power system environment

The new structure of electric power systems, which include separate generation, (GENCOs), transmission (TRANSCOs) and distribution (DISCOs) companies with an open access policy, will demand novel control and operation strategies to maintain the level reliability that consumers not only have taken for granted but expected. The paper addresses the design of a reduced H_∞ load frequency controllers for interconnected large-scale electric power systems for a possible structure in the new deregulated open-access environment. In the structure proposed the DISCOs are to be responsible for tracking the load by securing as much transmission and generation capacity as needed. A method is given to reduce the size of the controller using the singular values of the observability matrix of the full order H_∞ controller. An example is given to demonstrate the effectiveness of the proposed methodologies