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166 results on '"Matsuki, Junya"'

1. Power system harmonic analysis using state-estimation method for Japanese field data

Author

Kanao, Norikazu, Yamashita, Mitsunori, Yanagida, Hikoni, Mizukami, Munehisa, Hayashi, Yasuhiro, and Matsuki, Junya

Subjects
Global Positioning System -- Usage, Harmonics (Electric waves) -- Research, Electric power transmission -- Research, Global Positioning System, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The harmonic state-estimation (HSE) method appears to be effective but its applicability has yet been fully verified using actual data in power systems. Particularly in Japan, there has been no verification of the applicability of the method in actual power systems. In this paper, for Japanese field data synchronized with a Global Positioning System (GPS) clock, a practical method for power system harmonic analysis is proposed, which is based on HSE. In the proposed method, in order to improve the precision of HSE, uncertain parameters R, X, and Y of the transmission lines are determined from measured fundamental data, and bad measured harmonic data excluded systematically. It is also possible to estimate the error of each measurement instrument by using HSE. It is confirmed that by using only partial and selected measurement data synchronized with a GPS clock, the entire harmonic distribution of the actual power system has been obtained effectively. In this paper, field-test results of the HSE on an actual Japanese power system are shown. Furthermore, an example of harmonic analysis based on HSE in the actual power system is presented, which is prediction of harmonic voltage distribution after a change of the actual power system configuration. Index Terms--Global positioning system, least-squares methods, measurement error, power system harmonics, state estimation.

Published
2005

2. Loss minimum configuration of distribution system considering N-1 security of dispersed generators

Author

Hayashi, Yasuhiro and Matsuki, Junya

Subjects
Electric power distribution -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Dispersed generators (DGs), such as fuel cells and solar ceils, etc., are going to be installed in the demand side of power systems. The dispersed facilities can reduce distribution system loss by the appropriate allocation. However, when a DG that has a large capacity is disconnected from a distribution network by fault, violation of operational constraints, such as line current capacity and voltage drop, may occur. From a viewpoint of system reliability, robust system configuration for suddenly disconnecting DG from the distribution network must be determined, since system operators cannot control DG connection to the distribution network online. In this paper, the authors propose an algorithm to determine loss minimum configuration of a distribution system with DGs while maintaining system reliability. Namely, in the proposed algorithm, N-1 contingencies for DGs are considered as an operational constraint, when the loss minimum configuration is determined under the constraints for line current capacity and voltage drop. In order to determine the loss minimum configuration effectively, an algorithm based on tabu search with strategic oscillation is proposed. Numerical simulations are carried out for a distribution system model with 118 sectionalizing switches in order to examine the validity of the proposed algorithm in comparison with the conventional approach. Index Terms--Combinatorial optimization problem, dispersed generators, distribution system, loss minimum configuration, N-1 security, optimization method, strategic oscillation, tabu search.

Published
2004

3. Determination of optimal system configuration in Japanese secondary power systems

Author

Hayashi, Yasuhiro and Matsuki, Junya

Subjects
Electric fault location -- Methods, Electric power systems -- Management, Electric power systems -- Japan, Electric power systems -- United States, Company business management, Business, Electronics, Electronics and electrical industries
Abstract

In Japan, when a secondary radial power system (66 kV, 77 kV) has a number of connected feeders whose circuit breakers (CBs) can be opened or closed, the combinatorial number of possible system structures created by switching CBs becomes very large. In order to determine the optimal configuration of secondary radial power system in normal state and fault state, a new computation algorithm is proposed. The proposed algorithm is based on enumeration and Reduced Ordered Binary Decision Diagram (ROBDD). In order to verify the availability of the proposed approach, the authors obtain optimal configurations for normal and fault states on IEE of Japan secondary power system model (IEEJ model) by using the proposed method. IEEJ model has the distinctive characteristics of practical Japanese power systems, the total number of configuration candidates is the 76th power of 2 (=75 000 000 000 000 billion approximately). The optimality of the system configuration obtained by the proposed method is mathematically guaranteed. Index Terms--Combinatorial optimization problem, enumeration method, IEEJ secondary power system model, Japanese power systems, optimal configuration, optimality, reduced ordered binary decision diagram.

Published
2003

29. Development of Distribution Network Equipment to Support the Solution of Problem of Connecting Distributed Generators (ANSWER) and Verification Experiment of Active Coordinated Operation of Distributed Generator and Distribution Network

Author

Sakai, Shigekazu, primary, Hayashi, Yasuhiro, additional, Kawasaki, Shoji, additional, Matsuki, Junya, additional, Baba, Junpei, additional, Yokoyama, Akihiko, additional, Hojo, Masahide, additional, Wakao, Shinji, additional, Mori, Kenjiro, additional, and Fuwa, Yoshiaki, additional

Published
2010
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