Abstract
Many high voltage applications require three-phase inverters. The major challenge in inverter designing is the mitigation of harmonic distortion (HD) to achieve better inverting performance. Usually, sinusoidal pulse width modulation (SPWM) is widely used to trigger the inverting switches for controlling the total HD performance in the inverter. To provide the option of multiple operating ranges the multilevel inverters are designed for higher voltage operations. This paper contributes in two passes, first, an improved SPWM modulation is generated for designing the three levels inverter. Then in the second pass, the performance of the THD is evaluated under the different load conditions using V-I measurement. THD is present in the system due to the use of switches. Therefore, this paper has evaluated the performance of the proposed improved SPWM based multilevel inverter for analysis. In order to improve the performance, the modulation index of the SPWM block is varied. The performance of the component report is also presented in the short..the output waveform of the line current and the voltage are compared; The FFT analysis is done to evaluate the comparison of THD performance. It is concluded that improving the SPWM performance and the lording conditions may improve the THD performance also.
Highlights
With the invention of the fast switching characteristic of the different electrical inverting switches, the harmonic performance of inverters has become a great challenge during the last decades
Anubha Gupta et al [2] have designed the 2 phase inverter based on the sinusoidal pulse width modulation (SPWM) approach and presented a good comparison of the line and phase waveforms
Anuja Namboodiri et al [4] have designed an inverter using SPWM analysis and reported the FFT analysis of the total harmonic distortion (THD) achieved to 96%
Summary
With the invention of the fast switching characteristic of the different electrical inverting switches, the harmonic performance of inverters has become a great challenge during the last decades. It is highly desired to minimize the total harmonic distortion (THD) performance of the high voltage Inverters. Many high voltage industrial applications are required to use multilevel inverters (MLI). The broadly inverting operation is classified as single-phase and threephase. Our prime concern will be to compare the performance of each of these inverters based on the THD and FFT analysis. It is highly desired to minimize the THD in inverter designs
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