Fractional order two degree of freedom control for AGC of an interconnected multi-source power system

Abstract

This paper focused on design and application of Two-Degree-of-Freedom - Fractional Order PID (2-DOF-FOPID) Controller to solve the automatic generation control (AGC) problem of hydrothermal system as well as multi-area system comprising of different sources such as hydro, thermal and gas units. Appropriate generation rate constraints (GRC) is considered for each unit. The performance of proposed 2-DOF-FOPID controller is compared with different classical controllers for both the systems. Selection of optimum parameters of all the controllers are done using a Cuckoo search Algorithm (CSA). Critical examinations clearly reveal that proposed 2-DOF-FOPID controller provides much better performances compared to conventional controllers. The superiority of proposed controller is found in views of reduced peak overshoots and oscillations and improved settling time. Furthermore, robustness of the proposed 2-DOF-FOPID controller parameters is examined through sensitivity analysis.