Seiji Tange

Autonomous Decentralized Voltage Profile Control of Distribution Network considering Time-Delay

In a future distribution network, it is difficult to maintain voltage because a large number of distributed generators are introduced to the system. The authors have proposed an autonomous decentralized voltage control method using power factor control of distributed generators and multi-agent technology. However, the control method does not include the function which saves the reactive power output of distributed generators. In this paper, we propose a new control method which can save the excessive reactive power output. The method is formulated as a differential-difference type equations considering the time-delay with communications between the agents. The proposed method is tested in 4-node and 24-node model. The relationship between control performance and time-delay is discussed.

A study on autonomous decentralized voltage controller in distribution network considering control priority

It is of prime importance to introduce a large amount of distributed generators in order to solve the energy and environmental issue. In distribution network with a large amount of distributed generators, it becomes difficult to maintain the system voltage within an allowable range. Thus, we have developed a new voltage control method using reactive power control of system connection inverter. Especially, the method is based on the autonomous decentralized approach because it will be difficult to treat a large number of distributed generators by a centralized manner. And the method is composed by three control modes and they are switched by voltage change. However, such a switching control method often becomes unstable especially in the case the dead time is included in the control block. Hence, in this paper, we have developed a new method which is based on not the switching control but the continuous control. The autonomous decentralized controller for voltage profile maintenance is proposed and its dynamics are discussed in this paper.

Autonomous Decentralized Voltage Profile Control Method in Future Distribution Network using Distributed Generators

Takao Tsuji1, Tsutomu Oyama1, Takuhei Hashiguchi2, Tadahiro Goda2, Kenji Horiuchi3, Seiji Tange3, Takao Shinji4 and Shinsuke Tsujita4 1Faculty of Engineering, Yokohama National University 2Graduate School of Information Science and Electrical Engineering, Kyushu University 3Transmission & Distribution Systems Center, Mitsubishi Electric Corp. 4Smart Energy Technology Center, Tokyo Gas Co.,Ltd. Japan