Distributed Weight Adaptive Control for Frequency Regulation of Islanded Microgrid

• Published in: Energies (Basel) Vol. 15; no. 11; p. 4136
• Main Authors: Yu, Guoxing, Song, Huihui, Liu, Meng, Song, Zongxun, Qu, Yanbin
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.06.2022
• Subjects: adaptive control; Communication; Control methods; Convergence; Design; distributed control; Distributed generation; Frequency deviation; frequency regulation; Frequency stability; Frequency synchronization; islanded microgrid; multi-agent system; Optimization; Robust control; Stability analysis; Synchronization
• ISSN: 1996-1073; 1996-1073
• DOI: 10.3390/en15114136

The consensus control method based on a multi-agent system has been widely applied in the distributed control and optimization of microgrids. However, the following drawbacks are still common in current research: (1) ignoring the influence of consensus control commands on the synchronization stability of the physical grid under primary control; (2) only focusing on improving one property ofcontrol performance, lacking comprehensive considerations of multiple properties. With the aim of solving these problems, in this paper we propose a weight-adaptive robust control strategy for implementing distributed frequency regulation of islanded microgrids. Firstly, the frequency synchronization stability of the physical layer is analyzed by means of a coupled oscillator theory and the design objectives of the controllable parameters for the information layer are formed. Subsequently, the relationship between the weight coefficients and the two important control performances of convergence speed and delay robustness is strictly analyzed. Based on this, an adaptive coefficient that can be autonomously adjusted according to the frequency deviation is designed to achieve a trade-off between convergence speed and delay robustness. Finally, three simulation studies are presented to verify the effectiveness of the proposed control strategy.