POWER CONVERSION DEVICE AND COOLING METHOD THEREOF

To solve the problem that although forced air cooling is performed by a cooling fan so that an inverter composing a power conversion device prevents failure due to heat evolution, an exchange period of parts of the cooling fan is short and reliability is low, a maintenance period thereof is short, a...

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Hauptverfasser: GOTO KAZUSHI, TSUJIMOTO KENJI
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To solve the problem that although forced air cooling is performed by a cooling fan so that an inverter composing a power conversion device prevents failure due to heat evolution, an exchange period of parts of the cooling fan is short and reliability is low, a maintenance period thereof is short, and in the power conversion device installed on a pole, burden and cost required for a maintenance are heavy.SOLUTION: By rotating cooling fans 6a-6j at a rotation speed suppressed from the maximum rotation speed, an expected life of the cooling fans 6a-6j is prolonged. When a part of the cooling fans 6a-6j is broken, air flow required for cooling inverters 3a-3d is secured by increasing the rotation speed of normal cooling fans 6a-6j. As a result, even if a part of the cooling fans 6a-6j is broken, an immediate stop of a voltage adjustment operation by a power conversion device is not required.SELECTED DRAWING: Figure 1 【課題】電力変換装置を構成するインバータが発熱により故障しないよう冷却ファンで強制空冷するが、冷却ファンは部品の交換周期が短く信頼性も低いので、そのメンテナンス周期が短くなり、柱上に設置する電力変換装置においては、メンテナンスに要する負担や費用が重い。【解決手段】冷却ファン6a〜6jを最大回転数から抑制した回転数で回転させることで、冷却ファン6a〜6jの期待寿命を延ばす。冷却ファン6a〜6jの一部が故障した場合は、正常な冷却ファン6a〜6jの回転数を増加させることにより、インバータ3a〜3dの冷却に必要な風量を確保する。この結果、冷却ファン6a〜6jの一部故障によっても、電力変換装置による電圧調整動作を即時停止させる必要がない。【選択図】 図1