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2002•Proceedings of the CSEERequires access

A NOVEL SOFT SPWM WAVEFORM SYNTHETIC METHOD AND HARMONIC ANALYSIS

Hua He

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Abstract

In accordance with the characteristics that resonant DC link inverter should adopt discrete pulse modulation, we propose a novel method of soft SPWM waveform synthesis. The principle, synthetic method and implementation circuits for generating soft SPWM waveform are given. Taking bipolar SPWM waveform generating algorithm as an example, waveform error, phase shift and harmonics of the new soft SPWM waveform are analyzed. Simulation results show that fundamental component of the new soft SPWM waveform is higher than that of soft SPWM in present papers and low order harmonic components are lower. The phase shift of the new soft SPWM waveform is half of that of soft SPWM in present papers. The proposed new soft SPWM method has theoretical and application values for improving output waveforms of resonant DC link inverters.

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What this paper is about

In accordance with the characteristics that resonant DC link inverter should adopt discrete pulse modulation, we propose a novel method of soft SPWM waveform synthesis. The principle, synthetic method and implementation circuits for generating soft SPWM waveform are given. Taking bipolar SPWM waveform generating algorithm as an example, waveform error, phase shift and harmonics of the new soft SPWM waveform are analyzed. Simulation results show that fundamental component of the new soft SPWM waveform is higher than that of soft SPWM in present papers and low order harmonic components are lower. The phase shift of the new soft SPWM waveform is half of that of soft SPWM in present papers. The proposed new soft SPWM method has theoretical and application values for improving output waveforms of resonant DC link inverters.

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Available abstract

In accordance with the characteristics that resonant DC link inverter should adopt discrete pulse modulation, we propose a novel method of soft SPWM waveform synthesis. The principle, synthetic method and implementation circuits for generating soft SPWM waveform are given. Taking bipolar SPWM waveform generating algorithm as an example, waveform error, phase shift and harmonics of the new soft SPWM waveform are analyzed. Simulation results show that fundamental component of the new soft SPWM waveform is higher than that of soft SPWM in present papers and low order harmonic components are lower. The phase shift of the new soft SPWM waveform is half of that of soft SPWM in present papers. The proposed new soft SPWM method has theoretical and application values for improving output waveforms of resonant DC link inverters.

Key concepts: Waveform, Harmonics, Pulse-width modulation, Harmonic, Electronic engineering, Inverter, Control theory (sociology), Phase (matter)

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