Adaptive PI Control of STATCOM for Voltage Regulation

• Published in: IEEE transactions on power delivery Vol. 29; no. 3; pp. 1002 - 1011
• Main Authors: Xu, Yao, Li, Fangxing
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.06.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive control; Applied sciences; Automatic voltage control; Disturbances. Regulation. Protection; Electrical engineering. Electrical power engineering; Electrical machines; Electrical power engineering; Electricity distribution; Exact sciences and technology; Mathematical model; Operation. Load control. Reliability; Pi control; plug and play; Power networks and lines; proportional-integral (PI) control; Reactive power; reactive power compensation; Regulation and control; Regulators; STATCOM; Testing. Reliability. Quality control; Voltage measurement; voltage stability; Performance evaluation; Autonomous system; Integral proportional control; Flexible AC transmission systems; Control system; Voltage regulation; Power system stability; reactive power compensation; Adaptive control; Operating conditions; plug and play; Reactive power; Reactive current compensation; Static reactive compensator; Transportation network; Data transmission network; Voltage stability; Self control; System simulation; Control method; STATCOM; proportional-integral (PI) control; Control code
• ISSN: 0885-8977; 1937-4208
• DOI: 10.1109/TPWRD.2013.2291576

STATCOM can provide fast and efficient reactive power support to maintain power system voltage stability. In the literature, various STATCOM control methods have been discussed including many applications of proportional-integral (PI) controllers. However, these previous works obtain the PI gains via a trial-and-error approach or extensive studies with a tradeoff of performance and applicability. Hence, control parameters for the optimal performance at a given operating point may not be effective at a different operating point. This paper proposes a new control model based on adaptive PI control, which can self-adjust the control gains during a disturbance such that the performance always matches a desired response, regardless of the change of operating condition. Since the adjustment is autonomous, this gives the plug-and-play capability for STATCOM operation. In the simulation test, the adaptive PI control shows consistent excellence under various operating conditions, such as different initial control gains, different load levels, change of transmission network, consecutive disturbances, and a severe disturbance. In contrast, the conventional STATCOM control with tuned, fixed PI gains usually perform fine in the original system, but may not perform as efficient as the proposed control method when there is a change of system conditions.