A three-level npc inverter carrier frequency orderly change anti-phase stacked pulse width modulation method
A technology of pulse width modulation and carrier frequency, applied in the conversion of AC power input to DC power output, electrical components, high-efficiency power electronics conversion, etc., can solve the problem of complicated inverter modulation methods, increased inverter switching losses, and increased hardware Cost and other issues, to achieve the effect of easy implementation, balance control and low operating cost
Active Publication Date: 2022-06-07
CHINA UNIV OF MINING & TECH
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But this method not only increases the hardware cost, but also makes the inverter modulation method more complicated
Or increase the switching frequency of the inverter to reduce the harmonics and reduce the amplitude of the harmonics, but this obviously increases the switching loss of the inverter
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[0031] In order to facilitate the clear understanding of the technical solutions of the present invention by professionals, a method for orderly changing the carrier frequency of a three-level NPC inverter proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. . However, the content disclosed in this embodiment is the principle of the present invention, and is not limited to this example. It should be noted that the drawings adopt imprecise scales, which are only used to facilitate and clearly illustrate the technical solutions of the embodiments of the present invention.
[0032] The main circuit topology of the three-level NPC inverter used in this embodiment is as follows figure 1 shown. The mid-point clamped three-phase three-level inverter has A, B, and C three-phase bridge arms, and each phase bridge arm is composed of 4 IGBT power switch tubes, 4 freewheeling diodes and two cl...
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The invention discloses a three-level NPC inverter carrier frequency orderly changing reverse-phase laminated pulse width modulation method, which belongs to the inverter PWM modulation method. In this method, two triangular carriers with different frequency f 1 , f 2 orderly change to replace the fixed frequency in the conventional carrier inverse stacked pulse width modulation method (f 1 +f 2 ) / 2 of the triangular carrier, and the average carrier frequency of the ordered carrier is approximately equal to (f 1 +f 2 ) / 2. At the same time, the present invention adopts the improved zero-sequence voltage V 0 The injection method balances the midpoint potential of the capacitor on the DC side of the inverter. The present invention realizes the midpoint potential balance control of the DC side capacitor of the inverter, spreads the harmonic voltage spectrum, and reduces the harmonic peak value in the output voltage and current waveform without increasing the hardware cost and reducing the performance of the carrier inversion stacked pulse width modulation, thereby Reduce the negative impact of harmonics.
Description
technical field [0001] The invention relates to an inverter PWM modulation method, in particular to a reverse-phase stacked pulse width modulation method based on the orderly change of the carrier frequency of a three-level NPC inverter, and belongs to the field of power electronics and power transmission. Background technique [0002] The conventional carrier inversion stacked pulse width modulation method realizes the control of the amplitude and frequency of the fundamental voltage. However, using FFT to analyze the waveform of its line voltage, it can be seen that the waveform contains discrete harmonics with large peak values, and these harmonics are mainly concentrated at the switching frequency and its multiplier. These high-amplitude harmonics will increase the switching loss of the inverter, will enhance the electromagnetic interference in the inverter system, affect the safe and normal operation of other equipment, and will also cause mechanical vibration and large...
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IPC IPC(8): H02M7/483H02M1/088
CPCH02M7/483H02M1/088Y02B70/10
Inventor 张晓高捷傅琪雯张辉
Owner CHINA UNIV OF MINING & TECH