武田秀太郎

武田秀太郎

計量サステナビリティ学者・武田秀太郎 の個人ウェブサイトです。(元・国連職員 → 現・京都大学特定准教授)See the English Website here.

(Paper) Dynamic Simulation-Based Case Study of Fusion on Small-Scale Electrical Grids

ABSTRACT

This study analyzed adverse effects of fusion plants on the stability of small-scale grids through simulation-based case studies. Major frequency fluctuations were observed in the event of a plant start-up and a sudden interruption of fusion electric output power, as represented by plasma disruption, suggesting difficulties in fusion plant installation to majority of countries in the future. To mitigate the adverse effects, a fusion plant combined with an energy storage was proposed and evaluated. The results indicated that large energy storage like pumped-hydro storage could successfully reduce the frequency deviations to the acceptable range. An innovative offshore pumped-hydro storage, marine inverse dam, is also discussed in this paper.

JOURNAL

Fusion Science and Technology, Volume 68, Issue 2, 2015: 341-345

KEYWORDS

(Paper) Limitation of fusion power plant installation on future power grids under the effect of renewable and nuclear power sources

ABSTRACT

Future power grids would be unstable because of the larger share of renewable and nuclear power sources. This instability might bring some additional difficulties to fusion plant installation. Therefore, the authors carried out a quantitative feasibility study from the aspect of grid stability through simulation. Results showed that the more renewable and nuclear sources are linked to a grid, the greater disturbance the grid experiences upon a sudden output interruption of a fusion power plant, e.g. plasma disruption. The frequency deviations surpassed 0.2 Hz on some grids, suggesting potential limitations of fusion plant installation on future grids. To clearly show the suggested limitations of fusion plant installations, a novel diagram was presented.

JOURNAL

Fusion Engineering and Design, Volumes 109–111, Part B, 1 November 2016, Pages 1754-1758

KEYWORDS

(Paper) Requirements for DEMO from the Aspect of Mitigation of Adverse Effects on the Electrical Grid

ABSTRACT

The adverse effects of DEMO on the future electrical grid due to sudden output interruptions, such as disruptions, were analyzed quantitatively. The results indicated that when considerable percentage of renewables are installed, the power system would experience serious frequency deviations as large as 0.4 Hz, which is greater than the current tolerance, 0.2 Hz. DEMO installation would need an assessment as part of the power system, together with mitigation devices, to be connected to the grid.

JOURNAL

Plasma and Fusion Research, 2015 Volume 10 Pages 1205070

KEYWORDS