Design of dual mode fuzzy logic load frequency controller for interconnected power systems using superconducting magnetic energy storage unit

A design of dual mode fuzzy logic load frequency controller for interconnected two area thermal power systems with superconducting magnetic energy storage (SMES) unit is proposed in this paper. Nowadays due to increase in size, increased demand and complexity in interconnected power system, load frequency controller has become more significant. SMES technology has the potential to bring real power storage characteristics to the utility transmission and distribution systems. In general proportional and integral (PI) controllers are used for load frequency control, which is generally tuned on the basis of classical approaches. Proportional and Integral controller are slow and lack of efficiency in handling system nonlinearities. Hence it is much more needed to have controllers which are capable of self tuning in nature according to situations. Dual mode concept is incorporated in the proposed controller because it can improve the system performance. The system with the proposed controller was simulated and the frequency deviation resulting from a step load disturbance is presented. The comparison of proportional plus integral controller, fuzzy logic dual mode controller with SMES unit shows that, with the application of dual mode fuzzy logic controller, the system performance is improved significantly. In this paper, simulation results are carried out for a two area thermal reheat power system. The proposed controller is also found to be less sensitive to changes in the parameters of the system.