Comprehensive Power System Stability Improvement with ROCOF Controlled SMES

Abstract

In order to mitigate most power quality issues in renewable power penetrated systems, load frequency control in automatic generation control based power systems and transient stability concerns in any power system, the deviation in frequency at the point of common coupling is chosen as the driving input for SMES active power control (Δf-control). We report a rate of change of frequency (ROCOF) controlled SMES as a resilient damping device to counter exogenous uncertainties in a wind based multi machine system. Primarily, the ROCOF is contingent on the active power mismatch. SMES reference active power command is issued using a genetic algorithm tuned scheme, participating through ROCOF measurement. The non linear action of SMES is realized by controlling the converter firing angles by a smooth four-zone operation, thus determining the voltage applied across the superconducting inductor. While preserving the dynamics of the DC link and supervising the state of charge (SoC) of the inductor, the effectiveness of the aforementioned control strategy is authenticated by performing non-linear simulations in MATLAB/Simulink. In addition, the dominant modes are also tracked and it is found that the percentage increase in aggregate damping ratio is around 133% using the proposed ROCOF-SMES control.

Keywords:

• power system stability
• power system optimization
• power system transients
• wind energy
• voltage stability
• damping control
• power system dynamics and control

Additional information

Notes on contributors

Hailiya Ahsan

Hailiya Ahsan was born in Srinagar, Jammu and Kashmir, India on the 22ndof June 1992. She received her B. Tech in Electrical Engineering from National Institute of Technology (NIT), Srinagar in 2015. She is currently a senior research fellow in the department of Electrical Engineering at NIT Srinagar. Her research interests include power system modeling, predictive control, renewable energy, energy storage devices and power system dynamics, stability and control.

Mairajud Din Mufti

Mairajud Din Mufti received his Ph. D in Power System Control from the Indian Institute of Technology, New Delhi, India in 1998. He is currently a Professor with the department of Electrical Engineering, National Institute of Technology (NIT), Hazratbal, Jammu and Kashmir. He has held important positions like Dean Research and Development, Dean Academic Affairs and Head-Department of Electrical Engineering. In 2006, he was a visiting research fellow at the Osaka university, Japan. His research interests include power system stability, dynamics and control, intelligent and advanced control, renewable energy and application of energy storage devices.