A new theory of instantaneous reactive power compensation on three-phase power systems is proposed. The validity of the proposed theory is demonstrated by the simulation and experimental results.
The proposed theory is based on a new concept, that is, a three dimensional cross vector which is newly proposed and defined in this paper. The three dimensional cross vector is the cross product of a voltage space vector and a instantaneous current space vector on three-dimensional rectangular coordinates. And an instantaneous reactive current space vector is easily detected by using the three-dimensional cross vector.
Therefore, the proposed theory does not use any coordinate transformations, such as a rotating coordinate transformation or a three-phase to two-phase coordinate transformation. Hence, the instantaneous reactive power compensation system based on the proposed theory in this paper is essentially simpler than any conventional reactive power compensation system based on such coordinate transformations.

抄録全体を表示

Instantaneous compensation theory of reactive power is conventionally based on coordinate transformation method. That is, three phase voltages and currents on three dimensional coordinate are transformed into αβcoordinate or rotating coordinate quantities. Therefore, it is unavoidable for the control system to be complicated and also it is difficult to understand physical meanings of voltages and currents on the original three dimensional coordinate.
The authors have been proposed the instantaneous reactive power compensation theory using a three dimensional cross vector. The proposed theory does not use any coordinate transformations, such as a rotating coordinate transformation or a three-phase to two-phase coordinate transformation. Hence, the instantaneous reactive power compensation system based on the proposed theory is essentially simpler than any conventional reactive power compensation system based on such coordinate transformations.
In this paper, we apply the Cross vector theory to three-phase four-wire system. Since there is a neutral line in three-phase four-wire system, simplification of a reactive power compensation system is very difficult. Here, the authors develop a new method, that is, neutral line current separating and combining method. Applying the neutral line current separating and combining method to the Cross vector theory, control system of the instantaneous reactive power compensator for the three-phase four-wire system can be simplified.

抄録全体を表示

初等中等教育における生命領域の教育を，コンピテンス基盤型に再構成することを目的として研究を行ってきた。生命科学領域では，近年分子生物学をはじめとする新たな知見の増加や工学などの他領域との融合が進行し，取り巻く様相が変化している。学習指導要領においても生命領域で扱うコンテンツは変化し，高等学校生物では，新たな判断基準を求められるバイオテクノロジーなどの内容が含まれるようになっている。本研究においてはこのような変化を踏まえながら，医学教育における基本形を参考に，幼稚園，小学校，中学校，高等学校での生命科学教育において育成すべき資質・能力を抽出した。さらに理科の他領域で同様に抽出された資質・能力と統合・整理を行い，初等中等理科教育において児童生徒に育む4つのドメイン・オブ・コンピテンスに集約した。さらにここで整理されたドメイン・オブ・コンピテンスに基づき，生命科学教育が担うべきコンピテンス育成のための高等学校生物基礎における学習活動を考案するとともに，その実践を行った。

抄録全体を表示