POWER CONVERSION EQUIPMENT AND METHOD FOR DIAGNOSING POWER CONVERSION EQUIPMENT

PROBLEM TO BE SOLVED: To address a problem in that a deterioration state of a capacitance cannot be sensed with the operation of a power converter being continued since the power converter is operated/stopped periodically for sensing a reduction in the capacitance of a DC smoothing capacitor used in...

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Bibliographische Detailangaben
Hauptverfasser:	KOMINAMI TSUTOMU, AKITA YOSHITOSHI, SAWAHATA TATSUHIRO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS SYSTEMS FOR STORING ELECTRIC ENERGY TESTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To address a problem in that a deterioration state of a capacitance cannot be sensed with the operation of a power converter being continued since the power converter is operated/stopped periodically for sensing a reduction in the capacitance of a DC smoothing capacitor used in the power converter and the capacitance is calculated from the charging/discharging time of the DC smoothing capacitor.SOLUTION: Provided is power conversion equipment that converts electric power from AC to DC or DC to AC. The power conversion equipment includes a plurality of power converters. The power converters individually have a DC smoothing capacitor. The power converters are connected to a common DC voltage unit, and have a sensor of observing or a function of estimating electric current flowing in the DC voltage unit to which each of the power converters is connected. By analyzing the electric current in the DC voltage unit, it is possible to sense a deterioration state of the DC smoothing capacitor mounted on each of the power converters with the power converters remaining in the operational state.SELECTED DRAWING: Figure 1 【課題】電力変換器に使用される直流平滑用コンデンサの静電容量低下を検知するためには定期的に電力変換器の運転/停止をし，直流平滑用コンデンサの充電/放電時間から静電容量を算出していたため，電力変換器の運転を継続した状態で静電容量の劣化状態を検知することができないという課題があった。【解決手段】交流から直流へ，または直流から交流へ電力を変換する電力変換装置において，該電力変換装置は複数の電力変換器で構成され，該電力変換器は個別に直流平滑用コンデンサを持ち，かつ，該電力変換器は共通の直流電圧部に接続されており，各電力変換器が接続されている直流電圧部に流れている電流を観測するセンサまたは推定する機能を有し，該直流電圧部の電流を解析することで各電力変換器に搭載された直流平滑用コンデンサの劣化状態を電力変換器を運転状態のままで検知することが可能となる。【選択図】図1