A Modified Double-Integral-Sliding-Mode-Controller for a Microgrid System With Uncertainty

  • Swati Sucharita Pradhan Dept. of Electrical Engg., VSSUT Burla, Sambalpur, India
  • Raseswari Pradhan Dept. of Electrical Engg., VSSUT Burla, Sambalpur, India
Keywords: Three-phase microgrid, photovoltaic system, DISMC, H∞ controller, parametric uncertainties


Recently infiltration of large scale of microgrid systems into the power grid is recorded. Among these systems, photovoltaic (PV) based microgrid systems are more in demand due to its renewable, pollution free properties and abundantly available fuel. Grid integration of this microgrid system again enhanced its energy efficiency. But, dynamics of this PV based microgrid system is highly nonlinear and uncertain in nature. It suffers from parametric uncertainties. This kind of system can’t be controlled properly by conventional linear controllers. Sliding mode controller (SMC) is capable of controlling this kind of system with ease. However, SMC suffers from its inherent chattering introduction in the system output waveform. To reduce the chattering from the output waveform, there is requirement of some modification in the existing SMC structure dynamics. This paper presents an extended state observer based double integral sliding mode controller (DISMC) for this studied system. By using DISMC, the chattering magnitude is diminished greatly. Parameter uncertainties of the system lead to some unknown control states. These unknown states are identified by the state observer. Therefore, the proposed controller is more efficient in reference tracking, disturbance rejection and robust stability. To test the efficacies of the proposed controller, results of the studied system with this controller are compared with that of H∞ controller.


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Author Biographies

Swati Sucharita Pradhan, Dept. of Electrical Engg., VSSUT Burla, Sambalpur, India

Swati Sucharita Pradhan is pursuing her Ph.D. degree in department of EE, VSSUT, Burla under the supervision of Dr. Raseswari Pradhan and Prof. B. Subudhi. She has her educational degrees like B.Tech. from BPUT and M.Tech. from VSSUT, Burla. Her research interests are design and control of renewable energy systems.

Raseswari Pradhan, Dept. of Electrical Engg., VSSUT Burla, Sambalpur, India

Raseswari Pradhan was born in Bargarh, Odisha, India. She got her Ph.D. degree in control system engineering from National Institute of Technology, Rourkela, India in 2014. She got her B.E. and M.E. degrees in electrical engineering from I.G.I.T., Sarang, Utkal University, Odisha and Jadavpur University, Kolkata, respectively. Currently she is serving as an Assistant Professor in the Department of Electrical Engineering, Veer Surendra Sai University of Technology, Burla, India. She has more than ten papers published in various reputed journals like IEEE Transactions on Sustainable Energy, IEEE Transactions on Control Systems Technology, IET, Elsivier etc. In addition to that, she has more than thirty research publications in different conference proceedings. Till the date, she has guided seven M.Tech. and twenty-five B.Tech. research scholars. Now, four Ph.D. scholars, two M.Tech. scholars and seven B.Tech. scholars are working under her guidance. Her research interests include control, renewable energy and microgrid stability and industrial Electronics.


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