Self-tuning load frequency control: multilevel adaptive approach

A multilevel adaptive load frequency control (LFC) based on the self-tuning regulator (STR) is investigated. The technique identifies each subarea separately as an autoregressive moving average submodel and parameters are identified by using the recursive least-squares method. The parameters of the predicted submodel are used to ensure the subarea control error calculation. The application of the proposed algorithm is suggested as a suitable alternative to the integral control used normally for the LFC. This work differs from previous work in that the proposed technique permits optimality at all levels while providing a decomposed solution. The effectiveness of the control algorithm has been verified through numerical studies on the 20-machine, 118 bus IEEE test system.