| 摘要 |
<p>A controller (16) for a multi-level converter (10) regulates the DC midpoint voltage of the multi-level converter by accounting for the effect non-redundant switch states have on the DC midpoint current. The controller includes a DC bus regulator (18) that monitors the DC output voltage and generates in response a commanded voltage vector. A duty cycle calculator (22) is operably connected to receive the commanded voltage vector generated by the DC bus regulator and to generate in response to the commanded voltage vector duty cycles associated with non-redundant switch states. A DC midpoint regulator (20) is operably connected to receive the non-redundant duty cycles calculated by the duty cycle calculator and to generate in response a first midpoint current command that accounts for the effect the non-redundant switch states have on the midpoint current. Based, at least in part, on the calculated effect the non-redundant switch states will have on the midpoint current, the DC midpoint regulator regulates the DC midpoint voltage of the multi-level rectifier to a desired value.</p> |
