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, carrier overlapping technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. problem, to achieve the effect of good real-time performance, simple method and easy implementation

Active Publication Date: 2014-09-24
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

A large number of parameters are not conducive to the realization of real-time control systems, and the calculation of zero-sequence components is complicated, which is not conducive to the digital realization of the system

Method used

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  • Carrier wave overlapping based point voltage SPWM (Sinusoidal Pulse Width Modulation) control method in NPC (Neutral Point Clamped) type three-level inverter
  • Carrier wave overlapping based point voltage SPWM (Sinusoidal Pulse Width Modulation) control method in NPC (Neutral Point Clamped) type three-level inverter
  • Carrier wave overlapping based point voltage SPWM (Sinusoidal Pulse Width Modulation) control method in NPC (Neutral Point Clamped) type three-level inverter

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Embodiment

[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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Abstract

The invention discloses a carrier wave overlapping based midpoint voltage SPWM (Sinusoidal Pulse Width Modulation) control method in an NPC (Neutral Point Clamped) type three-level inverter. The control method comprises the steps of comparing the midpoint voltage and a set value measured in real time in the inverter, adjusting the overlapping value of the upper carrier waves and lower carrier waves according to the comparing result, comparing the upper carrier waves and the lower carrier waves obtained by adjustment and outputting PWM (Pulse Width Modulation) signals to control the work state of a switch tube of the inverter so as to realize the balance of the midpoint voltage of the inverter. According to the carrier wave based midpoint voltage SPWM control method, the modulated waves are kept constant, the overlapping value h of the upper carrier waves and the lower carrier waves is changed by increasing the amplitude value of the upper carrier waves or the amplitude value of the lower carrier waves, so that the balance of the midpoint voltage is realized, and the method has the characteristics of simple calculation, good timeliness and easy realization.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an NPC type three-level inverter midpoint voltage SPWM control method based on carrier overlapping. Background technique [0002] Compared with the traditional two-level inverter, the diode-clamped (NPC) three-level inverter can effectively reduce the harmonics of the output waveform at the same switching frequency because the output voltage is closer to the sine wave. Under certain conditions, the requirements for the withstand voltage level of switching devices are low, and the equivalent switching frequency is high, so it is widely used in medium and high voltage high power conversion fields such as medium and high voltage frequency conversion speed regulation, active power filter and power system reactive power compensation. . But the midpoint voltage balance problem is its inherent outstanding problem. Inconsistent DC bus capacitance parameters, unbal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/487
Inventor 程善美龚博宁博文刘江
Owner HUAZHONG UNIV OF SCI & TECH
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