With the wider utilization of clean energy, the performance of inverters plays a critical role in the power generation process. Inverter performance is primarily assessed by examining the electrical characteristics of its internal components and the total harmonic distortion (THD) present in its output waveform. Due to the limitation that conventional inverters cannot produce output voltages higher than the bus voltage, quasi-Z-source inverters have attracted significant research attention as an effective means to overcome this constraint. Current research on the performance of quasi-Z-source inverters primarily focuses on optimizing shoot-through time allocation by appropriately combining switching states, aiming to reduce inductor current ripple and enhance output waveform quality. Existing modulation strategies for quasi-Z-source inverters still exhibit relatively high inductor current ripple and suboptimal output power quality. The proposed strategy effectively suppresses inductor current ripple in quasi-Z-source circuits and enhances the quality of the power output. The switching timing is adjusted to generate 8 pairs of switching transitions in the upper and lower bridge arms during each cycle. The appropriate selection of the shoot-through state distribution, with a shoot-through state introduced at each switching pair, effectively suppresses the inductor current ripple in the circuit. A trade-off is made between the number of switches and the THD. Although the number of switching events increases, the output power quality is improved through the uniform distribution of the effective vectors. The existing 4-ZSVPWM and 6-shoot-through strategies are compared, and the effectiveness of the proposed modulation strategy is validated through simulation results.

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An Improved Vector Modulation Strategy for Inductor Current Ripple Suppression in Quasi-Z-Source Inverters

  • Ouyang Cheng,
  • Xiaodong Yao,
  • Hongxian Wang,
  • Ao Zheng

摘要

With the wider utilization of clean energy, the performance of inverters plays a critical role in the power generation process. Inverter performance is primarily assessed by examining the electrical characteristics of its internal components and the total harmonic distortion (THD) present in its output waveform. Due to the limitation that conventional inverters cannot produce output voltages higher than the bus voltage, quasi-Z-source inverters have attracted significant research attention as an effective means to overcome this constraint. Current research on the performance of quasi-Z-source inverters primarily focuses on optimizing shoot-through time allocation by appropriately combining switching states, aiming to reduce inductor current ripple and enhance output waveform quality. Existing modulation strategies for quasi-Z-source inverters still exhibit relatively high inductor current ripple and suboptimal output power quality. The proposed strategy effectively suppresses inductor current ripple in quasi-Z-source circuits and enhances the quality of the power output. The switching timing is adjusted to generate 8 pairs of switching transitions in the upper and lower bridge arms during each cycle. The appropriate selection of the shoot-through state distribution, with a shoot-through state introduced at each switching pair, effectively suppresses the inductor current ripple in the circuit. A trade-off is made between the number of switches and the THD. Although the number of switching events increases, the output power quality is improved through the uniform distribution of the effective vectors. The existing 4-ZSVPWM and 6-shoot-through strategies are compared, and the effectiveness of the proposed modulation strategy is validated through simulation results.