Abstract
The three-level neutral point clamped (NPC) voltage source inverter (VSI) has recently gained wide application in high-voltage variable frequency drives, as well as in power supply systems as a direct-to-alternating current converter. When operating this inverter, it is necessary to meet numerous technical requirements, including four primary criteria: output voltage (current) waveform quality, switching losses, neutral point (NP) voltage balance, and common-mode (CM) voltage. To enhance the aforementioned criteria, this paper introduces a space-vector PWM (SVPWM) algorithm with a hybrid switching sequence (SS), based on known combinations of five- and seven-stage SS. Three versions of hybrid switching sequences: H1-SS, H2-SS, and H3-SS, were proposed and their comparative analysis was carried out using computer modeling in MatLab+Simulink. Based on the experimental dependencies analysis of the total harmonic distortion (THD) of the inverter output current, the number of power key switching pairs, the maximum error of the NP voltage, and the level of the CM voltage from the inverter modulation coefficient and the regulation coefficient of the hybrid SS, the optimal hybrid SS, which turned out to be H1-SS, was determined. It ensures the best NP voltage balance and excludes even-order harmonics from the inverter output voltage spectrum. Thus, the proposed SVPWM algorithm with H1-SS proves to be an efficient tool for controlling the three-level VSI, positively affecting its energy conservation, size-weight indicators, and operational reliability.
Keywords
three-level neutral point clamped voltage source inverter, neutral point voltage, common-mode voltage, switching losses, space-vector PWM, hybrid switching sequence
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