2022 Fiscal Year Final Research Report

Event triggered control theory establishment for collaborative multi-layered protection system

Research Project

PDF

Project/Area Number	19H02158
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 21040:Control and system engineering-related
Research Institution	The University of Electro-Communications
Principal Investigator	Sawada Kenji 電気通信大学, i－パワードエネルギー・システム研究センター, 准教授 (80550946)
Co-Investigator(Kenkyū-buntansha)	小林孝一北海道大学, 情報科学研究院, 教授 (50452115) 市原裕之明治大学, 理工学部, 専任教授 (70312072)
Project Period (FY)	2019-04-01 – 2023-03-31
Keywords	制御システムセキュリティ
Outline of Final Research Achievements	This research addresses the control system security issues "How can we optimise the state transition of controllers depending on the operating state of the control system (control, maintenance, faults, etc.)?" and "How can we securely realise data synchronous control between heterogeneous control devices?" The focus is on the following two questions: In the former case, an event-triggered control method for optimising the operating state of controllers was constructed based on the search for the optimal path on a directed graph. In the latter, data synchronisation control was clarified based on consensus control and distributed estimation. In summary, we have developed the basis of an event-triggered control theory for a cooperative multi-layered defence technique in which various control devices cooperate and collaborate to improve the resilience of control systems against cyber-attacks during normal, fallback and recovery.
Free Research Field	制御工学
Academic Significance and Societal Importance of the Research Achievements	まず，産業制御システムにおいてサイバーセキュリティ問題は研究開始時点の2019年以降年々増大しており，世界的にも国内的にも被害総額が莫大になっている．この意味で，制御システムのセキュリティ理論に着目した本研究の社会的意義は高い．つぎに，制御分野における事象駆動型制御を用いた国内外のセキュリティ研究の多くは攻撃に対して安定性が崩れないように（受動的に）状態を推移させることが主となる．これに対して，本研究は制御システムの運転状態の推移制御を有向グラフ上の経路探索問題として表現することで，攻撃時の最適な運転状態の選択を能動的に実現するものである．この点に学術的意義がある．