Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 36, Issue 1, Pages 1092-1103Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2020.3001494
Keywords
Overmodulation; pulsewidth modulation; third-harmonic injection; total harmonic distortion; voltage gain
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Funding
- Jordan University of Science and Technology [20180499]
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This article proposes two adaptive optimal third harmonic injection-PWM schemes to minimize voltage total harmonic distortion and maximize DC bus utilization. Through simulation evaluations and experimental comparisons, the superior performances of the proposed schemes over other PWM schemes have been validated.
Voltage source inverters (VSIs) are widely utilized in motor drives and renewable energy integration. Pulsewidth modulation (PWM)-VSIs are employed to generate a controlled alternating current (ac) waveform from a finite direct current (dc) link voltage. When the amplitude of the reference signal exceeds its linearity limit, which is V-dc/2 for sinusoidal PWM(SPWM), a PWM-VSI operates in the overmodulation region which causes a significant reduction in the quality of the output ac voltage and the dc bus utilization (DBU). In this article, first, two adaptive optimal third harmonic injection (AOTHI)-PWM schemes are proposed to minimize voltage total harmonic distortion (THD) (AOTHI-THD v) and maximize DBU (AOTHI-DBU). To validate the effectiveness of the proposed schemes, the resulting THD and DBU values are compared with existing continuous/discontinuous PWM scheme results. Then, to meet the practical implementation in microcontrollers, one generalizedAOTHI-PWMis formulated to adaptively generate an optimal injection level using two proposed mathematical models. Aside from the simulation evaluations, the performances of the proposed schemes are also validated through experimental comparisons, which showa superiority over the other PWM schemes.
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