40 citations · 122 across the 17 of their papers we have counts for
19 papers
Relations Between Generalized JST Algorithm and Kalman Filtering Algorithm for Time Scale Generation
Yuyue Yan, Takahiro Kawaguchi, Yuichiro Yano +2
In this paper, we present a generalized Japan Standard Time algorithm (JST-algo) for higher-order atomic clock ensembles and mathematically clarify the relations of the (generalize…
Structured Kalman Filter for Time Scale Generation in Atomic Clock Ensembles
Yuyue Yan, Takahiro Kawaguchi, Yuichiro Yano +2
In this article, we present a structured Kalman filter associated with the transformation matrix for observable Kalman canonical decomposition from conventional Kalman filter (CKF)…
Equilibrium-Independent Passivity of Power Systems: A Link Between Classical and Two-Axis Synchronous Generator Models
Takayuki Ishizaki, Taku Nishino, Aranya Chakrabortty
We study the equilibrium-independent (EI) passivity of a nonlinear power system composed of two-axis generator models. The model of our interest consists of a feedback inter-connec…
Higher-Order Allan Variance for Atomic Clocks of Arbitrary Order: Mathematical Foundation
Takayuki Ishizaki, Taichi Ichimura, Takahiro Kawaguchi +2
In this paper, we perform a time-domain analysis of the higher-order Allan variance for atomic clock models of arbitrary order. Adopting a standard atomic clock model where the tim…
Distributed Design of Glocal Controllers via Hierarchical Model Decomposition
Hampei Sasahara, Takayuki Ishizaki, Jun-ichi Imura +2
This paper proposes a distributed design method of controllers having a glocal (global/local) information structure for large-scale network systems. Distributed design, independent…
Disconnection-aware Attack Detection and Isolation with Separation-based Detector Reconfiguration
Hampei Sasahara, Takayuki Ishizaki, Jun-ichi Imura +1
This study addresses incident handling during an adverse event for dynamical networked control systems. Incident handling can be divided into five steps: detection, analysis, conta…
Parameterization of All Output-Rectifying Retrofit Controllers
Hampei Sasahara, Takayuki Ishizaki, Jun-ichi Imura
This study investigates a parameterization of all output-rectifying retrofit controllers for distributed design of a structured controller. It has been discovered that all retrofit…
Disconnection-aware Attack Detection in Networked Control Systems
Hampei Sasahara, Takayuki Ishizaki, Jun-ichi Imura +1
This study deals with security issues in dynamical networked control systems. The goal is to establish a unified framework of the attack detection stage, which includes the four pr…
Parameterization of Retrofit Controllers
Hampei Sasahara, Takayuki Ishizaki, Jun-ichi Imura
This study investigates a parameterization of all retrofit controllers. Retrofit control can accomplish modular design of control systems, i.e., independent design of subcontroller…
Modularity-in-Design of Dynamical Network Systems: Retrofit Control Approach
Takayuki Ishizaki, Hampei Sasahara, Masaki Inoue +2
In this paper, we develop a modular design method of decentralized controllers for linear dynamical network systems, where multiple subcontroller designers aim at individually regu…
Retrofit Control with Approximate Environment Modeling
Takayuki Ishizaki, Takahiro Kawaguchi, Hampei Sasahara +1
In this paper, we develop a retrofit control method with approximate environment modeling. Retrofit control is a modular control approach for a general stable network system whose…
Dynamic Modeling, Stability, and Control of Power Systems with Distributed Energy Resources
Tomonori Sadamoto, Aranya Chakrabortty, Takayuki Ishizaki +1
This article presents a suite of new control designs for next-generation electric smart grids. The future grid will consist of thousands of non-conventional renewable generation so…
Day-Ahead Energy Market as Adjustable Robust Optimization: Spatio-Temporal Pricing of Dispatchable Generators, Storage Batteries, and Uncertain Renewable Resources
Takayuki Ishizaki, Masakazu Koike, Nobuyuki Yamaguchi +2
We present modeling and analysis of day-ahead spatio-temporal energy markets in which each competitive aggregator aims at making the highest profit by managing a complex mixture of…
Synchronization and Aggregation of Nonlinear Power Systems with Consideration of Bus Network Structures
Petar Mlinarić, Takayuki Ishizaki, Aranya Chakrabortty +3
We study nonlinear power systems consisting of generators, generator buses, and non-generator buses. First, looking at a generator and its bus' variables jointly, we introduce a sy…
Transient Response Improvement for Interconnected Linear Systems: Low-Dimensional Controller Retrofit Approach
Takayuki Ishizaki, Masakazu Koike, Jun-ichi Imura
In this paper, we propose a method of designing low-dimensional retrofit controllers for interconnected linear systems. In the proposed method, by retrofitting an additional low-di…
A Retrofitting-based Supplementary Controller Design for Enhancing Damping Performance of Wind Power Systems
Tomonori Sadamoto, Aranya Chakrabortty, Takayuki Ishizaki +1
In this paper we address the growing concerns of wind power integration from the perspective of power system dynamics and stability. We propose a new retrofit control technique whe…
Retrofit Control: Localization of Controller Design and Implementation
Takayuki Ishizaki, Tomonori Sadamoto, Jun-ichi Imura +2
In this paper, we propose a retrofit control method for stable network systems. The proposed approach is a control method that, rather than an entire system model, requires a model…
Passivity-Based Distributed Optimization with Communication Delays Using PI Consensus Algorithm
Takeshi Hatanaka, Nikhil Chopra, Takayuki Ishizaki +1
In this paper, we address a class of distributed optimization problems in the presence of inter-agent communication delays based on passivity. We first focus on unconstrained distr…
Weak Resilience of Networked Control Systems
Tomonori Sadamoto, Henrik Sandberg, Bart Besselink +3
In this paper, we propose a method to establish a networked control system that maintains its stability in the presence of certain undesirable incidents on local controllers. We ca…