降电容电压型准Z源三电平逆变器的建模与控制

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中图分类号：TM464 文献标志码：A 文章编号：2095-8188（2026）02-0050-08

DOI：10.16628/j.cnki.2095-8188.2026.02.007

Abstract：To investigate the intrinsic characteristics and DC busvoltage control strategy of the capacitor voltage reduced quasi Z-source three-level inverter，thebasic principleof the inverter is first analyzed.Then，the state space averaging method and small signal disturbance method areused to model the DC sideof the Z-source network，andthe transfer function fromthe through dutycycle tothe capacitor voltage of thequasi Z-source network is derived，providingatheoretical basis for theoptimal selectionofDC sideparametersandthedesignofcontrol systems.Finally，a voltagecurrentdual loopcontrol system for the inverter is designed，which indirectlycontrols the DC bus voltage and maintains a constant outputvoltage of the inverter，with good steady-state and dynamic performance.The correctnessof the small signal model and the rationality of the control systemare verified.

Key words： quasi Z-source three-level inverter; quasi Z-source network; neutral point clamped; small signal model;voltage and current dual-loop control

0引言

Z源逆变器作为一种阻抗网络逆变器，通过在直流侧引入由电感、电容和二极管组成的Z源网络，不仅使得逆变器的桥臂直通成为一种工作状态，还可实现逆变器输出电压的提升，提高逆变器系统的直通容错能力和能量转换效率[1-5]。（剩余6899字）