Ikuo Kurihara

Research and development of grid integration of distributed generation in Japan

According to recent target of the Japanese government, more than 50 GW photovoltaic (PV) power generation will be penetrated in the utility system until 2030. Current measures adopted to DG to keep power quality and safety of the grid may not be adapted any more in the large penetration. In advance of the declaration of the target, CRIEPI proposed the Autonomous Demand Area Power System (ADAPS) as a new concept of future demand area distribution system to cope with the large penetration of DG. Basic system composition and operation measures of the ADAPS were developed until 2007. In the paper, Japanese expected technical problems on grid interconnection of large number of DG are indicated. The state of research and development of the ADAPS is introduced. A new research framework “TIPS” to establish stable operation of whole power system to cope with larger and wider penetration is also introduced.

Application of dynamic rating to evaluation of ATC with thermal constraints considering weather conditions

Recently, with the advance of communication technologies and sensors, the so-called dynamic rating is now to be realized. The dynamic rating is a method to determine accurate ratings by utilizing real-time information such as conductor temperatures, ambient temperatures and wind speed. The dynamic rating is considered to be available for the efficient use of network under the deregulated environment. In this paper, the validity of the dynamic rating from the viewpoint of ATC is discussed, and also by considering the relationship between ATC with thermal constraints and weather conditions, ATC is estimated when the dynamic rating is applied to a power system

Development of a support tool to level transmission equipment replacements over long term

The progress of aging of transmission equipment is becoming a crucial issue in Japan, and appropriate replacement planning methods need to be developed in order to replace a large number of equipments installed up to 1990s in the future, while maintaining supply reliability and avoiding ‘reinvestment wall’. In this paper, a planning support tool is developed to build a replacement plan, which assure that the supply reliability of the whole network and replacement cost in each planning period (e.g. 5 years) can be kept below specified level over a long planning horizon (e.g. 30 years or more). The application of enumeration method to supply reliability assessment enables the tool to make efficiently parametric studies with respect to uncertain parameters of component reliability model.

Economical assessment of transmission congestion relieving technique for bilateral electricity transaction

This paper quantitatively evaluated the performance and characteristics of three kinds of congestion relieving technique (TLR, ranking method and CC method) from the viewpoint of social welfare and congestion charge. The results confirmed that the CC method attains comparatively high social welfare as well as economic fairness in both the simple three-bus system and the IEEJ EAST 10-machine system. Administrative relieving methods might achieve congestion relief with higher social welfare than CC, however, the economic impacts imposed on market participant are unequal. That is, it is difficult to secure economic fairness by administrative methods. Furthermore, numerical studies revealed a negative correlation between total congestion costs and social welfare