報告書番号

R11009

タイトル（和文）

高圧需要家から流出する高調波電流の電圧ひずみ抑制効果（その２）‐重負荷期と軽負荷期の相違‐

タイトル（英文）

The suppressing effect of voltage distortions in electirc power systems by harmonic current emitted by customers with high voltage power supply -Part 2: Difference between heavy-load season and light-load season -

概要 （図表や脚注は「報告書全文」に掲載しております）

第一報では，高圧需要家で測定された重負荷期の高調波データを分析し，(1)系統の高調波電圧は単相機器の高調波電流に起因していること，(2)三相機器の高調波電流は逆に系統の高調波電圧を抑制していること，(3)進相コンデンサへの直列リアクトルの設置が必要かつ十分な対策であることを報告した。第二報は軽負荷期のデータを分析し，第一報の結論の妥当性を確認した。
また，季節による違いは単相負荷にはほとんどなかった。三相負荷の高調波電流は軽負荷期には特に昼間時間帯に絶対値は小さくなるが，位相は重負荷期とほぼ同じく300～330度を中心に分布していた。
高調波電圧は軽負荷期の週末が最も大きく，重負荷期の平日が最も小さい。また昼間に比べて夜間は両者に大きな違いが見られない。これらの特徴は三相負荷の高調波電流に抑制効果があることを裏付けるものである。

概要 （英文）

In the report Part 1, the authors clarified the following matters by analyzing the harmonic voltage and current data measured at the supply points of customers with a 6.6-kV power supply during a heavy-load season.
(1) The harmonic voltages in the electric power-supply systems are produced mainly by single-phase equipment.
(2) The harmonic currents created by three-phase equipment and single-phase equipment cancel each other out and the harmonic currents from three-phase equipment reduce harmonic voltages.
(3) Connecting reactors in series with capacitors is necessary and sufficient for suppressing harmonic voltages.
In this report Part 2, the authors analyzed data which were measured during a light-load season and compared them with the data measured during a heavy-load season in the report Part 1.The three matters above are also correct in a light-load season. The difference of load between a light-load season and a heavy-load season is only three phase load in the daytime. The harmonic voltages during a light-load season are larger than during a heavy-load season only in the daytime. This also shows that the harmonic currents from three-phase equipment reduce harmonic voltages.

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