Single phase transformerless semi-Z-source inverter with reduced total harmonic distortion (THD) and DC current injection
Single phase transformerless semi-Z-source inverter with reduced total harmonic distortion (THD) and DC current injection
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DOI：
10.1109/ecce-asia.2013.6579281
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
T. Ahmed;S. Mekhilef;M. Nakaoka
中科院分区：
文献类型：
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作者：
T. Ahmed;S. Mekhilef;M. Nakaoka
本文提出了一种单相无变压器半Z源逆变器拓扑结构，以将分布式光伏发电机并入电网，降低总谐波失真（THD）和直流电流注入。这些建议的逆变器拓扑结构是能够实现的正弦输出电压仅使用两个有源开关，而传统的逆变器需要四个。为了克服半Z源逆变器的非线性电压增益问题，提出了一种改进的非线性SPWM技术，以提供所需的占空比，从而在输出端产生正弦电压。这种逆变器拓扑结构显示出较少的直流电流注入电网。此外，直流输入和交流输出电压共享公共接地，因此共模漏电流得到缓解。最后，一个原型额定50 W的构建和验证的理论结果与实验装置的结果。实验结果证明了该拓扑结构的有效性。
A single phase transformerless semi-Z-source inverter topology is presented in this paper in order to incorporate distributed photovoltaic generators to the grid with reduced total harmonic distortion (THD) and DC current injection. These proposed inverter topologies are capable of achieving the sinusoidal output voltage by using only two active switches whereas the traditional inverters require four. A modified form of nonlinear SPWM technique is employed here to overcome the nonlinear voltage gain problem of semi-Z-source inverter for providing desired duty cycle which generates the sinusoidal voltage at the output. This inverter topology shows less DC current injection to the grid. Furthermore, common ground is being shared by both DC input and AC output voltage; hence common mode leakage current gets mitigated. Finally, a prototype rated 50W is constructed and a verification of theoretical outcome with the results of the experimental setup are presented. The results of the experiments satisfy the effectiveness of the aforementioned topology.