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Multi Area Load Frequency Control in Power Systems via Internal Model Control Scheme using Model-Order Reduction

J.Devendra Kumar , Mr.M.Santosh Kiran

In an interconnected power system, as a power load demand varies randomly , both area frequency and tie-line power interchange also vary. When dealing with the LFC problem of power systems, unexpected external disturbances, parameter uncertainties and the model uncertainties of the power system pose big challenges for controller design. Present approach is based on two-degree-of-freedom, internal model control (IMC) scheme, which unifies the concept of model-order reduction like Routh and Padé approximations, and modified IMC filter design, recently developed by Liu and Gao [4]. The beauty of this paper is that in place of taking the full-order system for internal-model of IMC, a lower-order, i.e., second-order reduced system model, has been considered. This scheme achieves improved closed-loop system performance to counteract load disturbances. The proposed approach is simulated in MATLAB environment for a single-area power system consisting of single generating unit with a nonreheated turbine and due to its appreciable performance in a single area power system we have employed it to two area and four area power system. The effectiveness of the proposed controller is validated by applying a wide range of load disturbance.