Coordination of Reactive Power in Grid-Connected Wind Farms for Voltage Stability Enhancement

• Published in: IEEE transactions on power systems Vol. 29; no. 5; pp. 2381 - 2390
• Main Authors: Kumar, V. Seshadri Sravan, Reddy, Kommi Krishna, Thukaram, D.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-09-2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Generators; Loadability margin; Power system stability; PV curves; Reactive power; Stability criteria; Steady-state; trust region approach; variable speed wind generators; voltage stability; Wind power generation
• ISSN: 0885-8950; 1558-0679
• DOI: 10.1109/TPWRS.2014.2300157

This paper studies the feasibility of utilizing the reactive power of grid-connected variable-speed wind generators to enhance the steady-state voltage stability margin of the system. Allowing wind generators to work at maximum reactive power limit may cause the system to operate near the steady-state stability limit, which is undesirable. This necessitates proper coordination of reactive power output of wind generators with other reactive power controllers in the grid. This paper presents a trust region framework for coordinating reactive output of wind generators with other reactive sources for voltage stability enhancement. Case studies on 418-bus equivalent system of Indian southern grid indicates the effectiveness of proposed methodology in enhancing the steady-state voltage stability margin.