National Institute of Technology, Silchar

About: National Institute of Technology, Silchar is a education organization based out in Silchar, Assam, India. It is known for research contribution in the topics: Control theory & Electric power system. The organization has 1934 authors who have published 4219 publications receiving 41149 citations. The organization is also known as: NIT Silchar.

Comparison of performances of several types of classical controller in automatic generation control for an interconnected multi-area thermal system

Abstract: This paper presents automatic generation control (AGC) of interconnected two equal area and three unequal area thermal systems provided with single reheat turbine and generation rate constraints of 3% per minute. A maiden attempt is made to apply integral plus double derivative (IDD) controller in AGC. Controller gains in the two area system are optimized using classical approach whereas in the three area system controller gains and governor speed regulation parameters (Ri) are simultaneously optimized by using a more recent and powerful evolutionary computational technique called bacterial foraging (BF) technique. Investigations reveal on comparison that Integral (I), proportional-integral (PI), integral-derivative (ID), or proportional-integral-derivative (PID) all provide more or less same response whereas integral-double derivative (IDD) controller provides much better response. Sensitivity analysis reveals the robustness of optimum gains of IDD controllers and optimum values of speed regulation parameters at nominal loading condition to wide changes in system parameters such as loading condition, inertia constant (H), reheat time constant (Tr) and reheat coefficient (Kr) from their nominal values. The system performance is examined considering 1% step load perturbation in area1.

Hidden attractors in a new complex generalised Lorenz hyperchaotic system, its synchronisation using adaptive contraction theory, circuit validation and application

Abstract: Objectives of the paper are (1) to design two new real and complex no equilibrium point hyperchaotic systems, (2) to design synchronisation technique for the new systems using the contraction theory and (3) to validate the results by using circuit realisation. First a new no equilibrium point hyperchaotic system is developed using a 3-D generalised Lorenz system; then using the new system a new complex no equilibrium point hyperchaotic system is reported. Both the new systems have hidden chaotic attractors. Various dynamical behaviours are observed in the new systems like chaotic, periodic, quasi-periodic and hyperchaotic. Both the systems have inverse crisis route to chaos with the variation of parameter a and crisis route to chaos with the variation of parameters $$b,\ c$$ and d. These phenomena along with hidden attractors in a complex hyperchaotic system are not seen in the literature. Synchronisation between the identical new hyperchaotic systems is achieved using the contraction theory. Further the synchronisation between the identical new complex hyperchaotic systems is achieved using adaptive contraction theory. The proposed synchronisation strategies are validated using the MATLAB simulation and circuit implementation results. Further, an application of the proposed system is shown by transmitting and receiving an audio signal.