Reduced-Order Observer Control for Two-Area LFC System after Deregulation

In this paper, a reduced-order state observer with a practical point of view for load frequency control (LFC) problem in a deregulated power system is proposed. In the practical environment, there is limited access to all state variables of system and measuring all of them is usually impossible. So when the available sensors are less than the number of states or when it may be undesirable, expensive or impossible to measure directly all of the states, a reduced-order state observer can be applied as proposed in this paper. The proposed strategy is tested on a two-area power system and compared with the optimal full-state feedback method by using computer simulation. The results show that the proposed method improves the dynamic response of system and provides a control system that satisfies the LFC requirements.