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Appl. Sci. 2017, 7(7), 688; doi:10.3390/app7070688

Frequency Regulation of Power Systems with Self-Triggered Control under the Consideration of Communication Costs

1
College of Automation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2
College of Electronic and Information Engineering, Southwest University, Chongqing 400715, China
3
School of Computing, Informatics, and Decision Systems Engineering, Arizona State University, Tempe, AZ 85287, USA
4
State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, China
*
Author to whom correspondence should be addressed.
Academic Editor: Johannes Kiefer
Received: 9 April 2017 / Revised: 29 June 2017 / Accepted: 30 June 2017 / Published: 4 July 2017
View Full-Text   |   Download PDF [1570 KB, uploaded 4 July 2017]   |  

Abstract

In control systems of power grids, conveying observations to controllers and obtaining control outputs depend greatly on communication and computation resources. Particularly for large-scale systems, the costs of computation and communication (cyber costs) should not be neglected. This paper proposes a self-triggered frequency control system for a power grid to reduce communication costs. An equation for obtaining the triggering time is derived, and an approximation method is proposed to reduce the computation cost of triggering time. In addition, the communication cost of frequency triggering is measured quantitatively and proportionally. The defined cost function considers both physical cost (electricity transmission cost) and communication cost (control signal transmission cost). The upper bound of cost is estimated. According to the estimated upper bound of cost, parameters of the controller are investigated by using the proposed optimization algorithm to guarantee the high performance of the system. Finally, the proposed self-triggered power system is simulated to verify its efficiency and effectiveness. View Full-Text
Keywords: frequency regulation; self-triggered control; input to state stable; communication cost frequency regulation; self-triggered control; input to state stable; communication cost
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Zhu, Z.; Sun, J.; Qi, G.; Chai, Y.; Chen, Y. Frequency Regulation of Power Systems with Self-Triggered Control under the Consideration of Communication Costs. Appl. Sci. 2017, 7, 688.

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