Naruhito Kodama

Power Variation Control of a Wind Turbine Generator Using Probabilistic Optimal Control, Including Feed-Forward Control from Wind Speed

The 500kW wind generator was developed as one of the projects of NEDO (New Energy and Industrial Technology Development Organisation in Japan), and several tests on its performance have been made. Based on the measurement data, we modelled the NEDO 500kW wind generator(1),(2), and have investigated a method to reduce power variations under fluctuating wind conditions. This paper presents a control strategy based on a probabilistic optimal control scheme, and makes comparisons between power variations with the conventional PID controller and with the proposed controller. The result showed that the proposed controller could reduce the covariance of power variations to approximately one third.

Power variation control of a wind generator by using feed forward control

The pitch control of wind generators is usually made by a feed back control concept. However, under the conditions where a wind speed changes very frequently due to geographic reasons of the site and the target system has large rotor inertia, the feed back signal which is applied to the control system to compensate disturbance such as wind speed variations is delayed, and consequently the control strategy to keep the generated power at a constant value does not work well. If the wind speed shows too much variation, this will cause a violent variation of power and result in step out operation of the generator from the power system due to magnetic saturation. This paper proposes a control strategy to reduce the power variations by introducing feed forward control combining with the conventional feed back control.

Web-Based Data Acquisition System of Wind Conditions and its Application to Power Output Variation Analysis for Wind Turbine Generation

This paper presents a Web-based data acquisition system of wind conditions via the Internet, and its application to power output variation analysis for wind turbine generation. Wind energy is promising renewable energy, and is globally increasing. However, with the increase of wind power integration to power grid, the wind power generation is having a great influence on power system operation due to such issues as frequency and voltage variations. It is important to reserve generation capacity to suppress these variations and to schedule its operation. For this purpose, the authors have developed a Web-based data acquisition system of wind conditions via the Internet. The Web-based data acquisition system is automatically able to gather wind climate data measured at lighthouses operated by The Maritime Safety Agency of JAPAN. Based on the observed data, a short term prediction, for example a few hours ahead, of wind speed was constructed using neural network. Using this system, the authors could predict the wind power variations at each site, at simultaneous times and conclude that this work would be possible to forecast reservation power to suppress the wind power variations

Power variations of a wind turbine generator connecting to power system

Wind turbine generators are driven by stochastically fluctuating wind speeds, and hence the generated power variation causes voltage and frequency changes in the case of a small power system on an isolated island. To cope with such variations, a control strategy for controlling wind turbines is required. This paper presents a new control scheme based on disturbance accommodation control. The results show that the proposed controller can drastically reduce the power variation.

An automated musical scoring system directly from sounds for Tsugaru and Nambu Shamisen

Local traditional arts people and the citys traditional music preservation society have strongly wanted a technology to accurately score traditional music, especially Tsugaru Shamisen. This music will be preserved as scores, which avoids relying solely on the oral transmission of this music to the young performers. At this time, we have experimentally produced an “Electric Shamisen” equipped with a pick-up microphone attached to each string and automatic scoring equipment, which automatically records scores from the sound source. This research has established the basic technology to analyze and process the sound source, score processing; and score recording. We intend to further develop automatic scoring of other traditional musical instruments and vocal music.

Research of the automatic scoring system by taking sounds down in musical notations for traditional folk instruments(Tsugaru shamisen)

Hachinohe Institute of Technology in Japan is uniquely situated within the amalgam of Tsugaru and Nambus traditional arts. Local traditional arts people and the citys traditional music preservation society have strongly wanted a technology to accurately score traditional music, especially Tsugaru Shamisen and Nambu Shamisen. This music will be preserved as scores, which avoids relying solely on the oral transmission of this music to the young performers. At this time, we have experimentally produced an “Electric Shamisen” equipped with a pick-up microphone attached to each string and automatic scoring equipment, which automatically records scores from the sound source. This research has established the basic technology to analyze and process the sound source, score processing; and score recording. We intend to further develop automatic scoring of other traditional musical instruments and vocal music.

Multi-agent-based control technology with ITP method for remote control supervisory systems

Introducing multi-agent (MA) technology into a remote control supervisory (RCS) system can improve the serviceability and enhance maintenance-free operation with the inter-terminal parameter (ITP) method. In addition, the systems distributed intelligent field terminals (IFTs) use a common algorithm that is unaffected by any changes to the system specifications. As a result of these innovations, the proposed system has much better serviceability because it is much easier to make modifications compared to that of conventional systems. This system has been implemented for practical purposes at over 60 sites.