Carrier wave overlapping based point voltage SPWM (Sinusoidal Pulse Width Modulation) control method in NPC (Neutral Point Clamped) type three-level inverter
A three-level inverter and carrier overlapping technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve complex zero-sequence component calculations, unfavorable system digital implementation, etc. problem, to achieve the effect of good real-time performance, simple method and easy realization
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[0048] The NPC-type three-level inverter midpoint voltage control method based on carrier overlap of the present invention can effectively realize midpoint voltage control. image 3 The algorithm implementation block diagram of the method of the present invention is given, u' tri1 , u′ tri2 are the carrier values after overlapping, respectively. Fcn1 is the adjustment function of the carrier amplitude, when the amplitude of the uplink becomes 1+h, the downlink remains unchanged, u′ tri1 is given by:
[0049]
[0050] When the download amplitude value becomes 1+h, the uplink carrier remains unchanged, u′ tri2 is given by:
[0051] u tri 2 ′ = 2 T × ( 1 + h ...
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