Load Frequency Control of Multi-Area Restructured Power System

This paper presents the design of a linear quadratic regulator for load frequency control problem in a restructured competitive electricity market with a pragmatic viewpoint. In the practical environment, access to all of the state variables of system is limited and measuring all of them is also impossible. To solve this problem, in this paper the optimal output feedback regulator is proposed. In the output feedback method, only the measurable state variables within each control area are required to use for feedback. The performance of the proposed method is studied on a two-area power system considering different contracted scenarios. The results of the proposed controller are compared with the full-state feedback and state observer methods. The results are shown that when the power demands change, the output feedback method have a good ability to track of contracted and/or non-contracted demands.