FC TYPE 3-LEVEL POWER CONVERSION DEVICE

• Main Authors: OI KAZUNOBU, KOBORI KENJI
• Format: Patent
• Language: English; Japanese
• Published: 24.09.2020
• 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 charge both a flying capacitor and a filter capacitor in an FC-type 3-level power conversion device without outputting current to the outside of the device.SOLUTION: Based on a comparison between a flying capacitor voltage Vfc and 1/2 of a filter capacitor voltage Va on a high-pressure side, a comparison between the filter capacitor voltage Va on the high-pressure side and the flying capacitor voltage Vfc + a filter capacitor voltage Vb on a low-pressure side, a comparison between the flying capacitor voltage Vfc and the filter capacitor voltage Vb on the low-pressure side, and a comparison between the filter capacitor voltage Vb on the low voltage side or the filter capacitor voltage Va on the high voltage side and the filter capacitor voltage command value, first to fourth semiconductor switching elements T1 to T4 are turned on or off to pass current through a path containing a filter reactor L, and a flying capacitor FC and a filter capacitor C2 on the low-voltage side or a filter capacitor C1 on the high-voltage side is charged to a predetermined value.SELECTED DRAWING: Figure 1 【課題】ＦＣ型３レベル電力変換装置において、装置外部に電流を出力することなくフライングキャパシタとフィルタコンデンサの両方を充電する。【解決手段】フライングキャパシタ電圧Ｖｆｃと高圧側のフィルタコンデンサ電圧Ｖａの１／２との比較、および、高圧側のフィルタコンデンサ電圧Ｖａとフライングキャパシタ電圧Ｖｆｃ＋低圧側のフィルタコンデンサ電圧Ｖｂとの比較、フライングキャパシタ電圧Ｖｆｃと低圧側のフィルタコンデンサ電圧Ｖｂとの比較、および、低圧側のフィルタコンデンサ電圧Ｖｂまたは高圧側のフィルタコンデンサ電圧Ｖａとフィルタコンデンサ電圧指令値との比較、に基づいて、第１〜第４半導体スイッチング素子Ｔ１〜Ｔ４をＯＮまたはＯＦＦしてフィルタリアクトルＬを含む経路に電流を流し、フライングキャパシタＦＣおよび低圧側のフィルタコンデンサＣ２または高圧側のフィルタコンデンサＣ１を所定の値に充電する。【選択図】図１