Tomomichi Seki

Load following operation of NAS battery by setting statistic margins to avoid risks

Among various types of battery energy storage systems (BESSs), NAS battery is the most promising products. NAS battery is a commercial product implemented widely in the world. The first purpose of BESS was improvement of load factors. The second purpose is improvement of power quality, especially against voltage-sag. The recent interest is oriented to utilize BESS to mitigate the intermittency of renewable energy.

Decentralized autonomous object-oriented EMS/SCADA system

Energy management systems/supervisory control and data acquisition (EMS/SCADA) systems are usually geographically distributed and have operational organizations. They are changing in accordance with the various and varying environments, and they should be flexible enough to adapt to those changes quickly. The paper proposes a new architecture called SCOPE (System Configuration of Power Control System) to realize flexible and reliable EMS/SCADA systems. SCOPE makes application programs independent of the operational organization and system configuration of the EMS/SCADA system, i.e., application programs are not influenced by changes in them. These properties make EMS/SCADA systems flexible and reliable, and also the development of EMS/SCADA systems becomes efficient and economical. Through developing and evaluating a SCOPE prototype system, it has been confirmed that the flexibility and maintainability of EMS/SCADA systems based on the SCOPE architecture has been improved.

Supervisory Control of Power Systems: Reliability Improvement

Abstract Prediction of future Supervisory Control and Data Acquisition (SCADA) system configuration is difficult because it is closely related with varyings of strategies of systems control/operation and computer architecture. This paper proposes a new approach to realize a reliable and flexible SCADA system under which application programs can hardly be affected by the varyings. SCOPE is a new infrastructure supporting to build the SCADA system. It consists of “Execution dependence part” and “Operation dependence part” in order to realize a reliable and flexible SCADA system under distributed environments. This paper introduces a new design concept, a reliable technique and the evaluation result on SCOPE prototype system.

A Study on Transmission Replacement Plan Considering Multiple Supply Networks

Abstract – In recent years, Japanese electric power supply network equipments are almost at the end of their lifetime. It is an urgent necessity to manage their replacements[1]-[2]. In this paper, replacement planning approach for electric power supply network is studied based on the actual network model. The EENS (Expected Energy Not Supplied) is used as an index for reliability of supply network. The aging effect of equipments is also treated. It is assumed that the retransmission failure probability of single circuit fault is increased due to the aging of the equipments. In our previous papers, single supply network connected to one substation is examined[3]-[4]. On the contrary, multiple supply networks connected to different substations are examined in this paper. If the EENS of individual supply network is used for evaluation, the replacement plan may become too severe. However, evaluating the total EENS in multiple supply networks, the replacement plan becomes flexible. Keywords

Best-Mix Generation Planning with Battery Energy Storage System Including Carbon-Neutral Requirement

Battery energy storage system (BESS) is attracting attention all over the world. BESS yields two types of benefits, i.e., economical benefit and environmental benefit. Economical benefit is yielded by reducing the cost of power plants that is composed by the operation cost and the construction cost. Recent serious concern against environment will be more important in the near future and it might be treated as penalty and/or constraints. The installation merit of BESS stands out when load factor of demand is low. If base generators composed of inexpensive and clean sources, and if peak generators composed of expensive and dirty sources, the benefit against operation cost becomes more remarkable. Besides, BESS can contribute to developing countries by reducing construction cost of generation plants. In this paper, the numerical analysis of this benefit is presented. The optimal amount of BESS is searched by evaluating CO2-reductions and cost benefits.