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METHOD OF POTENTIAL NEUTRAL POINT CONTROL FOR A SINGLE-PHASE NPC INVERTER
METHOD OF POTENTIAL NEUTRAL POINT CONTROL FOR A SINGLE-PHASE NPC INVERTER
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机译：单相NPC逆变器的电位中点控制方法
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摘要
A plurality of carrier patterns, which are a carrier pattern A and a carrier pattern B, are formed by dividing triangular wave carrier signals every 1/2 cycle at a timing when the triangular wave carrier signals cross each other. A carrier pattern by which a neutral point potential is balanced is selected from the carrier pattern A and the carrier pattern B on the basis of an upper arm DC voltage detection value Ea, a lower arm DC voltage detection value Eb and an output current detection value Iout. By performing a PWM operation that compares the selected carrier pattern with an output voltage command Vref, an ON/OFF signal for the each switch is generated. With these operations, in a single-phase NPC inverter, a neutral point potential of a DC voltage is controlled without changing a switching timing.
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