Neutral-point voltage control method of NPC (neutral-point converter) type three-level inverter based on interval selection
A three-level inverter, voltage control method technology, applied in electrical components, output power conversion devices, AC power input conversion to DC power output and other directions, can solve the problem of digital implementation of unfavorable systems, complex calculation of zero-sequence components, etc. question
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[0049] The midpoint voltage control method of the NPC type three-level inverter based on interval selection of the present invention can effectively realize the midpoint voltage control. image 3 A block diagram of the algorithm realization of the present invention is given, and the proportional-integral PI controller is used to obtain the voltage offset Δu, the lower limit of the limiting value is m-1, and the upper limit is 1-m. The adjustment angle can be obtained by multiplying the absolute value of the adjustment amount by 2π clipping. The range of the adjustment angle is 0≤Δθ≤π / 2, and the adjustment angle, the adjustment amount and the modulation wave before adjustment can be substituted into the adjustment function Fcn. The adjusted three-phase modulation wave is obtained, and the adjustment function Fcn is given by equations (6)~(8):
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[0053] This method needs to sample the midpoint voltage U np , and the U np with U dc / 2 for com...
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