Modulation method for a three-phase multilevel converter
AssigneeDelta Electronics (Shanghai) Co., Ltd.
InventorKai Chen
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Abstract
The present invention discloses a modulation method for a three-phase multilevel converter. The modulation method comprises the following steps: generating first three-phase sinusoidal modulated wave signals by a control loop in the three-phase multilevel converter; generating second three-phase modulated wave signals by processing the first three-phase sinusoidal modulated wave signals, wherein in proximity to peak values of a line voltage of the second three-phase modulated wave signals, absolute values of any two phases are unequal; generating PWM pulse signals based on the second three-phase modulated wave signals; and generating driving signals for respective power units in the three-phase multilevel converter based on the PWM pulse signals.
Claims14
A modulation method for a three-phase multilevel converter, comprising the following steps:
- step 1:
- generating first three-phase sinusoidal modulated wave signals by a control loop in the three-phase multilevel converter;
- step 2:
- generating second three-phase modulated wave signals by processing the first three-phase sinusoidal modulated wave signals,
- wherein in proximity to peak values of a line voltage of the second three-phase modulated wave signals, absolute values of any two phases are unequal;
- step 3:
- generating PWM pulse signals based on the second three-phase modulated wave signals;
- and
- step 4:
- generating driving signals for respective power units in the three-phase multilevel converter based on the PWM pulse signals.
A three-phase multilevel converter, comprising:
- a control loop for generating first three-phase sinusoidal modulated wave signals;
- a plurality of power units;
- a modulator which is electrically coupled with the control loop and the power units,
- wherein the modulator processes first three-phase sinusoidal modulated wave signals to generate second three-phase modulated wave signals, generates PWM pulse signals based on the second three-phase modulated wave signals, and transmits the PWM pulse signals to the plurality of power units, and the power plurality of units generate driving signals based on the PWM pulse signals,
- wherein in proximity to peak values of a line voltage of the second three-phase modulated wave signals, absolute values of any two phases are unequal.
Dependencies are inferred from the claim text.