Control of Chaos, Multistability and Coexisting Behaviors in Small Scale Grid

Piyush Pratap Singh

Abstract: This talk explores the nonlinear dynamical behaviors exhibited by Small Scale Grids (SSG), focusing on the phenomena of chaos, multistability, and coexisting attractors. Power systems, inherently nonlinear and complex, can demonstrate undesirable chaotic oscillations and multistability under disturbances such as load variation, wind power fluctuation, and external noise. Through detailed mathematical modeling of an SSG with synchronous and wind turbine generators, the study analyzes the impact of key parameters and perturbations using tools like bifurcation diagrams, Lyapunov exponents, and phase portraits. The results show how parameter variations and additive white Gaussian noise can erode the system's safe basin, leading to instability. To address these challenges, an Adaptive Fractional Second Order PID Sliding Mode Control (AFSO-PIDSMC) technique is proposed. This controller effectively suppresses chaos and manages multistability, providing stable and chatter-free responses. The findings offer critical insights into ensuring stable SSG operation, enhancing reliability, and informing parameter tuning in practical microgrid systems.

Biography: Piyush Pratap Singh received a Ph.D degree in specialization in Control and Industrial Automation in the Electrical Engineering Department at NIT Silchar, Assam in 2016. Presently, he is an Assistant Professor in the Electrical Engineering Department, NIT Meghalaya, Sohra, India. He has research interests in Control Systems, Chaos synchronization, Chaos and Nonlinear Dynamics, Chaos behaviour in Power Systems, Smart grid, Biological systems, and Control of complex networks. He has published more than 90 research papers in the reputed, SCI and Scopus-indexed journals and conferences. He is a senior member of the IEEE Society and a Life Member of the Institute of Engineers (IE) and a member of the International Federation of Automatic Control (IFAC) Society.

Design and Development of Two-Dimensional Transition Metal Dichalcogenides Nanosheets Based Two-Terminal Gas Sensing Devices

Ravindra K Jha

Abstract: Two-terminal gas sensing devices have emerged as one of the important and reliable technologies in the post-Moore era. Advancement in this area has laid the foundation to several modern technologies like wearable devices, Internet of nano things, breath monitoring devices etc. However, most of the sensors are either based on metal oxides (MOX) or conductive polymers. The MOX based devices require elevated temperature for its efficient operation while conductive polymer-based sensors have their own disadvantages including poor stability, low and sluggish response, and vulnerability in response when operated in harsh environment. Therefore, a quest for new and advanced functional materials has always remained. In this talk, speaker will highlight the major disadvantages of MOX based gas sensing devices followed by discussion on transition metal dichalcogenides (TMDs) including WS2, MoS2, WSe2, and MoSe2. The sensors fabricated by various established routes such as liquid phase exfoliation (LPE), microwave route, CVD etc. will be discussed with emphasis on fabrication challenges.

Biography: Ravindra K Jha obtained his doctorate at IIT Kharagpur while working on Two-Dimensional Transition Metal Dichalcogenides Based Sensors and gained post-doctoral experience at IISc Bangalore in the same domain. Currently, he is an assistant professor in the Electronics and Electrical Engineering Department at IIT Guwahati. He served as a scientist at CSIR-Central Electronics Engineering Research Institute at Pilani, Rajasthan, India before moving to his current role. He is a senior member of IEEE and a governing council member of the Institute of Smart Structures & Systems (ISSS).