On load frequency control in a deregulated environment

The paper addresses the design of robust load frequency controllers for electric power systems in a deregulated environment. The system is modeled as a collection of independent distribution companies supplied by generation companies either directly or trough transmission companies. The distribution companies are responsible for tracking the load and hence they are in charge of the load frequency control problem. The problem is cast into a robust H_∞ control design problem. Connections between distribution companies and the rest of the system are taken as disturbances. An example is given to illustrate the proposed approach