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Harmonic quantitative calculation method for three-phase two-level inverter based on CBPWM technology

A three-phase inverter, quantitative calculation technology, applied in electrical components, output power conversion devices, conversion of AC power input to DC power output, etc., can solve the problems of complex analysis, complex derivation process and results, etc. Accurate results, concise harmonic calculation expressions, and simple derivation process

Inactive Publication Date: 2018-01-05
SICHUAN UNIV
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Problems solved by technology

The double Fourier series method is mainly used in the harmonic spectrum analysis of three-phase converters, and the analysis of this method is relatively complicated
Although the double Fourier series analysis method based on Bessel function can quantitatively analyze the influence of the dead zone on the voltage harmonic spectrum, its derivation process and results are very complicated, and its focus is on the high-order harmonics related to the switching frequency. Wave

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  • Harmonic quantitative calculation method for three-phase two-level inverter based on CBPWM technology
  • Harmonic quantitative calculation method for three-phase two-level inverter based on CBPWM technology
  • Harmonic quantitative calculation method for three-phase two-level inverter based on CBPWM technology

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Embodiment

[0106] A typical two-level inverter is used to compare the simulation and theoretical calculations. The frequency of the modulation wave of the inverter is f=50Hz, and the triangular carrier frequency is f c =10kHz, DC side voltage is U dc =100V, modulation degree m=0.7, dead time T d = 12.5 μs. A time-domain simulation model of the inverter is built on the Matlab / Simulink platform. When the dead zone is not set, the Fourier analysis is performed on the simulation results of the output voltage of phase a, and the u a Harmonic spectrum and u calculated based on the theoretical calculation method in this paper a Harmonic spectrum for comparison ( Image 6 , Figure 7 ). When setting the dead zone, Fourier analysis is performed on the simulation results of phase a output voltage, and the phase voltage harmonic spectrum obtained by simulation is compared with the phase voltage harmonic spectrum calculated based on the theoretical calculation method in this paper ( Figure ...

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Abstract

The invention discloses a harmonic quantitative calculation method for a three-phase two-level inverter based on a CBPWM technology. A harmonic calculation formula of the three-phase two-level inverter is deduced based on a fourier series analysis method; influence of a dead zone time to the output phase voltage waveform of the three-phase inverter is analyzed in detailed through a CBPWM modulation process to deduce a dead zone additional harmonic calculation formula; and influence of the dead zone to the harmonic amplitude value is analyzed in a quantitative manner so as to reveal a harmonicgeneration mechanism of a dead zone effect theoretically. The CBPWM three-phase two-level inverter harmonic quantitative analysis and calculation is proposed based on the fourier series analysis by considering that along with application of the PWM technology, the inverter easily causes harmonic pollution, harmonic resonance and the like, so that the inverter output phase voltage harmonic can be calculated quantitatively; and the requirements of simple deducing process, accurate calculation result and simple harmonic calculation expression can be satisfied.

Description

technical field [0001] The invention relates to the technical field of converter control and modulation, in particular to a harmonic quantitative calculation method for a three-phase two-level inverter based on CBPWM (carrier based pulse width modulation) technology. Background technique [0002] The harmonic analysis of PWM inverter is of great significance in solving the problems of harmonic pollution and harmonic resonance. The application of PWM technology makes the voltage source inverter have the advantages of simple circuit, high efficiency and fast dynamic response. However, the harmonic problems brought by the three-phase pulse width modulation voltage source inverter will also have adverse effects on the grid-connected grid and loads, and may cause harmonic instability or harmonic resonance. [0003] There are many methods for analyzing harmonics and dead zone effects of PWM converters. Double Fourier series method and Bessel function provide good technical suppor...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M7/5387H02M7/5395
Inventor 王顺亮焦宁刘天琪
Owner SICHUAN UNIV
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