In this paper, we propose a design and simulation of improved diode assisted voltage fed three phase quasi z-source inverter for photovoltaic application. Variable shoot through time interval is generated by adding low frequency voltage with constant voltage and the control signal for variable shoot is generated using boost PWM control. The output quality of three phase QZSI is improved by replacing the diode with active power switch in Switch Boost Inverter (SBI). Additionally, we use fuzzy logic controller for optimizing the shoot through duty ratio and modulation index from the source side rectifier, which increases the gain of three phase QZSI. The proposed topology in photovoltaic application increases the input voltage gain and voltage boost property by reducing the number of components, voltage ratings and stress across the switches in three phase QZSI. The proposed method enables improved voltage gain in single stage conversion, which is used for boost function. The simulation of proposed photovoltaic model is built on Simulink. Performance of proposed is evaluated against various metrics including power consumption, delay and power delay product and it is compared against existing VSI.

在本文中，我们提出了一种用于光伏应用的改进的二极管辅助电压馈电三相准Z源逆变器的设计和仿真。通过将恒定电压与低频电压相加，可产生可变的直通时间间隔，并使用升压PWM控制来产生可变的直通控制信号。通过用开关升压逆变器（SBI）中的有功功率开关代替二极管，可以改善三相QZSI的输出质量。此外，我们使用模糊逻辑控制器来优化源侧整流器的直通占空比和调制指数，从而增加了三相QZSI的增益。在光伏应用中建议的拓扑结构通过减少组件数量来增加输入电压增益和升压特性，三相QZSI中开关两端的额定电压和应力。所提出的方法能够在用于升压功能的单级转换中改善电压增益。所建光伏模型的仿真是基于Simulink建立的。根据各种指标（包括功耗，延迟和功率延迟乘积）评估提议的性能，并与现有的VSI进行比较。