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Harmonic analysis of digital SPWM inverter

He Chun

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Abstract

An approximate area equivalent algorithm based on area equivalent principle is proposed for SPWM(Sine Pulse Width Modulation)inverter,which considers the factors of data storage,smallest switching time and so.Taking the unipolar area equivalent algorithm as an example,the simulative calculation is carried out through VB programming based on Fourier series theory and the harmonic of SPWM inverter output voltage is analyzed.Compared with area equivalent algorithm and natural sampling algorithm for digital SPWM inverter,the experiment results show that the harmonic ampli-tude of output voltage is nearly the same ,but the switching times are reduced.

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What this paper is about

An approximate area equivalent algorithm based on area equivalent principle is proposed for SPWM(Sine Pulse Width Modulation)inverter,which considers the factors of data storage,smallest switching time and so.Taking the unipolar area equivalent algorithm as an example,the simulative calculation is carried out through VB programming based on Fourier series theory and the harmonic of SPWM inverter output voltage is analyzed.Compared with area equivalent algorithm and natural sampling algorithm for digital SPWM inverter,the experiment results show that the harmonic ampli-tude of output voltage is nearly the same ,but the switching times are reduced.

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Available abstract

An approximate area equivalent algorithm based on area equivalent principle is proposed for SPWM(Sine Pulse Width Modulation)inverter,which considers the factors of data storage,smallest switching time and so.Taking the unipolar area equivalent algorithm as an example,the simulative calculation is carried out through VB programming based on Fourier series theory and the harmonic of SPWM inverter output voltage is analyzed.Compared with area equivalent algorithm and natural sampling algorithm for digital SPWM inverter,the experiment results show that the harmonic ampli-tude of output voltage is nearly the same ,but the switching times are reduced.

Key concepts: Pulse-width modulation, Inverter, Harmonic, Fourier series, Harmonic analysis, Voltage, Sampling (signal processing), Mathematics

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