Patent ID: 9379548
Filing Date: 2016-06-28
CPC Classification: H02J,H02M,Y02E

Claim Text:
1. A reactive power compensator comprising: multilevel inverter circuits respectively constituting each of three phases; a filter circuit for reducing harmonics connected between a system interconnection terminal and an output terminal of each of said multilevel inverter circuits; and a control section that outputs a prescribed three-phase AC voltage by controlling each of said multilevel inverter circuits, wherein said multilevel inverter circuits are constituted by connecting in series two or more single-pulse inverters of single-phase full-bridge construction that convert DC voltage respectively to positive/negative single-pulse voltages once per cycle of a fundamental wave of a voltage instruction value, and terminals of said multilevel inverter circuits on an opposite side to a terminal of a power system are connected, in all phases, as a neutral point; wherein said control section determines a single-pulse phase with which single pulses are output by said single-pulse inverters based on a comparison of a threshold value and a voltage instruction value of said single-pulse inverters and said threshold value is variable, a voltage of a DC capacitor in said single-pulse inverter is controlled by said variable threshold value.