POWER CONVERSION DEVICE, POWER CONVERSION SYSTEM, AND POWER CONVERSION METHOD

• Main Authors: YAMAZAKI AKIRA, HIGUCHI MASAHITO, INOMATA KENTARO, HARA HIDENORI
• Format: Patent
• Language: English; Japanese
• Published: 07.05.2020
• Subjects: 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

To provide a power conversion device effective in suppressing a circulating current between a plurality of power conversion devices connected in parallel with each other.SOLUTION: Power conversion devices 2, 2A are connected in parallel with other power conversion devices 2, 2A, and includes: a carrier wave generation unit 130 for generating a carrier wave; a pulse generation unit 142 for generating a pulse signal synchronized with the carrier wave; an inverter circuit 12 for generating electric power according to a width of a pulse signal; a circulating current monitoring unit 110 for acquiring a monitoring value corresponding to a circulating current between the other power conversion devices 2, 2A; and a carrier period changing unit 120 for changing the period of the carrier wave to reduce the circulating current based on the monitoring value acquired by the circulating current monitoring unit 110 while the inverter circuit 12 is generating drive power.SELECTED DRAWING: Figure 2 【課題】互いに並列に接続された複数の電力変換装置間における循環電流の抑制に有効な電力変換装置を提供する。【解決手段】電力変換装置２，２Ａは、他の電力変換装置２，２Ａと並列に接続される電力変換装置２，２Ａであって、キャリア波を生成するキャリア波生成部１３０と、キャリア波に同期したパルス信号を生成するパルス生成部１４２と、パルス信号の幅に応じた電力を生成するインバータ回路１２と、他の電力変換装置２，２Ａとの間における循環電流に対応する監視値を取得する循環電流監視部１１０と、インバータ回路１２が駆動電力を生成している間に、循環電流監視部１１０が取得した監視値に基づいて、循環電流を縮小するようにキャリア波の周期を変更するキャリア周期変更部１２０とを備える。【選択図】図２