Modularity in Design of Dynamical Network Systems: Retrofit Control Approach

• 成果类型: Article
• 署名作者: Ishizaki, Takayuki; Sasahara, Hampei; Inoue, Masaki; Kawaguchi, Takahiro; Imura, Jun-ichi
• 署名单位: Institute of Science Tokyo; Tokyo Institute of Technology; Royal Institute of Technology; Keio University; Gunma University
• 刊物名称: IEEE TRANSACTIONS ON AUTOMATIC CONTROL
• ISSN/ISSBN: 0018-9286
• DOI: 10.1109/TAC.2020.3035631
• 发表日期: 2021
• 页码: 5205-5220
• 关键词: Power system stability; Generators; Design methodology; Power system dynamics; Frequency control; stability analysis; STANDARDS; Modularity in design; power system stabilizer (PSS); retrofit control; Youla parameterization

摘要

In this article, we develop a modular design method of decentralized controllers for linear dynamical network systems, where multiple subcontroller designers aim at individually regulating their local control performance with accessibility only to their respective subsystem models. First, we derive a constrained version of the Youla parameterization that characterizes all retrofit controllers for a single subcontroller, defined as an add-on-type subcontroller that manages a subsystem. The resultant feedback system is kept robustly stable for any variation in the neighboring subsystems, other than the subsystem of interest, provided that the original system is stable prior to implementing the retrofit control. Subsequently, we find out a unique internal structure of the retrofit controllers, assuming that the interaction input signal from the neighboring subsystems is measurable. Furthermore, we show that the simultaneous implementation of multiple retrofit controllers, designed by individual subcontroller designers, can improve the upper bound of the overall control performance. Finally, the practical significance of the method is demonstrated via an illustrative example of frequency regulation using the IEEE 68-bus power system model.