Impedance source inverters (ZSIs) have many advantages like the ability to work as a buck or boost inverter and work with different renewable energy sources and can be applied as a voltage source or current source inverter. The switching circuits of ZSI normally are complicated and hard to be implemented. In this paper, a modified sinusoidal pulse width modulation method for ZSI block is presented based on an optimized mathematical model in order to switch the power components of this inverter. The proposed switching structure can be extended to more than one phase, by using the combination of the step-up converter, ZSI networks with the same switching topology for per phase and a full bridge inverter block in order to present a pure sinusoidal wave in the structure’s output especially for resistive and inductive loads which are the real and industrial types of the loads. The Boost converter has been applied in our proposed structure in order to enhance the level of the generated voltages by RESs. Due to the ability to increase the voltage across the wide range, good resistance to electro-magnetic interference, acceptable total harmonic distortion value of the waves and immunity through shoot, this converter can be used extensively in PV systems, cell fuel, wind power and UPS systems. One of the most important specifications of the proposed switching method is working with low and intermediate values of duty cycles for power MOSFETs that can decrease the dynamic losses of the inverter. A wide range of mathematical analysis and simulations have been done to explain the proposed method, and experimental results confirm the theoretical analysis by a 100 W laboratory prototype.

中文翻译：

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一种改进控制器结构的多相阻抗源逆变器

阻抗源逆变器 (ZSI) 具有许多优点，例如能够作为降压或升压逆变器工作以及与不同的可再生能源一起工作，并且可以用作电压源或电流源逆变器。ZSI的开关电路通常比较复杂，难以实现。在本文中，基于优化的数学模型，提出了一种改进的 ZSI 块的正弦脉宽调制方法，以切换该逆变器的功率组件。通过使用升压转换器的组合，所提出的开关结构可以扩展到多于一相，ZSI 网络每相具有相同的开关拓扑和全桥逆变器块，以便在结构的输出中呈现纯正弦波，特别是对于电阻和电感负载，这些负载是实际和工业类型的负载。升压转换器已应用于我们提出的结构中，以提高 RES 产生的电压水平。由于能够在宽范围内增加电压，良好的抗电磁干扰能力，可接受的波的总谐波畸变值和穿透能力，该转换器可广泛用于光伏系统、电池燃料、风能和UPS 系统。所提出的开关方法最重要的规格之一是使用功率 MOSFET 的低占空比和中间值，可以降低逆变器的动态损耗。已经进行了广泛的数学分析和模拟来解释所提出的方法，实验结果证实了 100 W 实验室原型的理论分析。