Distributed Generation Based WADC for Inter-Area Oscillations Considering Unknown Inputs

Abstract

Inter-area oscillations (IAOs) are one of the main problems for contemporary power systems because of their low-damping characteristics. Additionally, the damping behaviors of IAOs might be further deteriorated by the addition of low inertial distributed generation (DG) to the power system. Therefore, a novel wide-area damping controller (WADC) for DG-integrated power systems is developed utilizing a modal linear quadratic regulator (LQR) technique that only targets essential IAOs without degrading other local modes. The states participated in linear combination from modal LQR are generally unavailable and need to be estimated. Full order observers are frequently used in literature, although they may not function if some inputs are unavailable. Hence, an unknown input observer (UIO) is suggested in this paper to estimate the states despite certain inputs being unknown. The proposed methodology is then tested on a DG-integrated 4-machine, 11-bus system and 10-machine, 39-bus system to validate the overall proposed design process. Results show that the proposed WADC successfully dampens the crucial IAO modes by 10% and 15% while not degrading other modes of the system.

Keywords:

• inter-area oscillation
• wide area power system stabilizer
• wide area damping controller
• distributed generation
• unknown input observer

Acknowledgement

This work was supported by Central Power Research Institute (CPRI), Ministry of Power, Govt. of India under Grant CPRI/RD/TC/Trans/2022.

Disclosure Statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Central Power Research Institute (CPRI), Ministry of Power, Govt. of India under Grant CPRI/RD/TC/Trans/2022.

Notes on contributors

Abhineet Prakash

Abhineet Prakash received the B.E. degree in Electrical and Electronics Engineering from the Rajiv Gandhi Proudyogiki Vishwavidyalaya Bhopal, India, in 2015 and the M.Tech. degree in Power Systems from the National Institute of Technology Patna, India in 2018. He is currently pursuing his Ph.D. degree with the Department of Electrical Engineering, Indian Institute of Technology Patna, India. He was a Visiting Researcher with the Department of Electrical Engineering and Computer Science, Khalifa University, Abu Dhabi, UAE. He was the recipient of the Certificate of Excellence Award from National Institute of Technology Patna in 2018. He has also been awarded with prestigious POSOCO Power System Awards 2023 by Grid Controller of India Ltd, Govt. of India. His research interests include power system operation, control and stability.

Kumar Abhinav

Kumar Abhinav received the B.Tech. degree in Electrical and Electronics Engineering from Manipal Institute of Technology, Karnataka, India, in 2016 and the M.Tech. degree in Power Systems from the National Institute of Technology Patna, India in 2022. He is currently pursuing his Ph.D. degree with the Department of Electrical Engineering, Indian Institute of Technology Patna, India. His research interests include power system operation, control and stability.

Piyush Rai

Piyush Rai received the B.Tech. degree in Electrical and Electronics Engineering from the Jodhpur Institute of Engineering & Technology, India, in 2014 and the M.Tech. degree in Power Systems from the National Institute of Technology Patna, India in 2018. He is currently working as Research Associate with Department of Electrical Engineering, Indian Institute of Technology Patna, India. His research interests include power system operation, control and stability.

Sanjoy Kumar Parida

Sanjoy Kumar Parida received the Ph.D. degree in Power System from the Department of Electrical Engineering, IIT Kanpur, India, in 2009. He is currently an Associate Professor with the Department of Electrical Engineering, IIT Patna, India. He has handled several major projects as PI and Co-PI sponsored by DST and MietY, Govt. of India. He is reviewer and technical advisor in many international journals and conferences. He was awarded the Senior Research Fellowship (SRF) by the Power Management Institute, NTPC Ltd., Noida, in 2007, during his Ph.D. program. He has received the Young Scientist Award by DST, Govt. of India, in 2010, and Bhaskar Advanced Solar Energy (BASE-2015) Research Fellowship Award by Indo US Science and Technology Forum (IUSSTF), DST, Govt. of India, in 2015. He has also received the Young Faculty Research Fellowship Award by Digital India Ltd., MeitY, Govt. of India in 2019. His research interest includes powers system dynamics, power system protection and demand side management.