POWER CONVERSION DEVICE

• Main Author: IWABORI MICHIO
• Format: Patent
• Language: English; Japanese
• Published: 08.06.2015
• 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

PROBLEM TO BE SOLVED: To solve the problem that for a multiple inverter, a plurality of single-phase two-level inverter cells are connected in series for each phase, but when this circuit is replaced with single-phase three-level inverter cells, the number of semiconductor elements increases and the device cost becomes expensive, although the number of control devices can be reduced.SOLUTION: To the output of a three-phase three-level inverter cell, for which two sets of a secondary windowing of an insulating transformer are inputted, is connected in series the output of a single-phase three-level inverter cell for which two sets of another secondary winding are inputted, the smoothing capacitor voltage values of the three-phase three-level inverter cell and single-phase three-level inverter cell are equalized, and the phase voltage amplitude of the three-phase three-level inverter cell is reduced to 1/2 of the phase voltage amplitude of the single-phase three-level inverter cell. Also, two forward converters of the three-phase three-level inverter cell are made to a first group, and each of three forward converters of the single-phase three-level inverter cell are made to be a second and a third group, then the converters are operated in phase within the group, and operated out of voltage phase between the groups. 【課題】多重インバータでは、各相毎に単相２レベルインバータセルを複数台直列接続するが、この回路を単相３レベルインバータセルに置換えると、制御装置の数は減らせるが、半導体素子数が増加し、装置が高価になる。【解決手段】絶縁変圧器の二次巻線を２組入力する三相３レベルインバータセルの出力に、別の二次巻線を２組入力する単相３レベルインバータセルの出力を直列接続し、三相３レベルインバータセルと単相３レベルインバータセルの平滑コンデンサ電圧値を等しくし、単相３レベルインバータセルの電圧振幅を全て等しくし、三相３レベルインバータセルの相電圧振幅を単相３レベルインバータセルの電圧振幅の１／２とする。また、三相３レベルインバータセルの順変換器２台を第１群とし、単相３レベルインバータセルの順変換器３台毎を第２群、第３群とし、群内は同相、群間は電圧位相を異ならせる運転とする。【選択図】図１