Load frequency control of interconnected power systems via minimum variance regulators

This paper describes the design of minimum variance regulators to control the load frequency and tie-line power of an interconnected power system. Unlike previous approaches where deterministic models are used, a stochastic model of the power system is considered here. A self-tuning regulator and a detuned minimum variance regulator have been developed where the latter allows some of the closed-loop poles to be assigned to specific locations. A simulation study of a two-area power system is included. It is shown that the detuned minimum variance regulator with an extended least-squares estimation technique gives better results than the other regulator.