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A novel reduced leakage current modulation technique for Z-source inverter used in photovoltaic systems

机译:用于光伏系统的Z源逆变器的新型降低泄漏电流调制技术

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摘要

In this study a novel modulation technique is proposed to reduce common mode leakage current in a three-phase Z-Source inverter used in a photovoltaic (PV) system. The proposed method reduces common mode current as well as common mode voltage (CMV); moreover, it reduces inverter output current total harmonic distortion at high switching frequencies. At first, previously presented techniques are summarised. Then, proposed technique is presented theoretically. Finally, conventional space vector modulation and the proposed modulation technique are simulated for a 10 kW PV power generation system. The validity of the proposed modulation technique is verified through MATLAB/Simulink. Simulations are performed for different load power factors and switching frequencies with considering real application parameters to provide a certain comparison between conventional and proposed modulation techniques. The results are analysed considering both CMV, leakage current and inverter output current quality, and the results verify effectiveness of the proposed technique.
机译:在这项研究中,提出了一种新颖的调制技术,以减少光伏(PV)系统中使用的三相Z源逆变器中的共模泄漏电流。所提出的方法减少了共模电流以及共模电压(CMV)。此外,它还降低了逆变器输出电流在高开关频率下的总谐波失真。首先,总结了先前提出的技术。然后,从理论上提出了提出的技术。最后,针对10 kW光伏发电系统对常规空间矢量调制和建议的调制技术进行了仿真。通过MATLAB / Simulink验证了所提出的调制技术的有效性。在考虑实际应用参数的情况下,针对不同的负载功率因数和开关频率进行了仿真,以提供传统调制技术和提议的调制技术之间的某种比较。分析了CMV,泄漏电流和逆变器输出电流质量的结果,结果验证了所提出技术的有效性。

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    《Power Electronics, IET》 |2014年第3期|496-502|共7页
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