MULTILEVEL POWER CONVERSION DEVICE AND CONTROL METHOD THEREOF

PROBLEM TO BE SOLVED: To reduce rating capacity of a multilevel power conversion device comprising three single-phase inverters by equalizing output power of the single-phase inverters.SOLUTION: A multilevel power conversion device 100 comprises: a three-phase power conversion section 3 which includ...

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Hauptverfasser:	TAKAHASHI MASAAKI, YOSHIHARA TAKEHIRO, KAWAMURA MASAHIDE, SHINDO YUJI
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 CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To reduce rating capacity of a multilevel power conversion device comprising three single-phase inverters by equalizing output power of the single-phase inverters.SOLUTION: A multilevel power conversion device 100 comprises: a three-phase power conversion section 3 which includes three single-phase inverters 3a-3c and in which one output terminal of each of the single-phase inverters is connected to a load 4 and other output terminals of the three single-phase inverters 3a-3c are interconnected to form a neutral point N; and a control section 7 for controlling an output voltage of each of the single-phase inverter so as to change a potential of the neutral point N in such a manner that output power of the single-phase inverters 3a-3c is decreased in comparison with the case where the potential of the neutral point N is not changed. 【課題】三台の単相インバータを有するマルチレベル電圧変換装置において単相インバータの出力電力の均等化を図り、装置の定格容量を低減することを目的とする。【解決手段】マルチレベル電力変換装置１００は、３つの単相インバータ３ａ〜３ｃを含み、各単相インバータの一方の出力端子が負荷４に接続され、且つ３つの単相インバータ３ａ〜３ｃの他方の出力端子が中性点Ｎを形成すべく互いに接続される、三相の電力変換部３と、各単相インバータ３ａ〜３ｃの出力電力が前記中性点Ｎの電位を変化させない場合に比べて減少するように当該中性点Ｎの電位が変化するよう各単相インバータの出力電圧を制御する制御部７と、を備える。【選択図】図１