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EMI and ground leakage current reduction in single-phase grid-connected power converter

机译：单相并网功率转换器中的EMI和接地泄漏电流降低

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摘要

Ground leakage current in a power converter is a major concern, which has stringent limitations due to safety concerns. Presence of high-frequency pulses, with high dv/dt due to switching actions in common-mode (CM) voltage, result in injection of current waveforms with large di/dt spikes into the ground and causes high electromagnetic interference (EMI) noise level. In this study, a new method is proposed to make the CM voltage, of a single-phase grid-connected inverter, sinusoidal and free of high-frequency pulses. The proposed method consists of two parallel connected H-bridge power converters, which uses unipolar pulse width modulation (PWM) with carrier interleaving angle of 180°. The proposed method reduces the ground leakage current by more than an order of magnitude. A novel modification to the LCL filter is proposed which further reduces the leakage current by 48%. It is shown that these modifications make the overall system insensitive to circuit non-idealities. Experimental results based on ground leakage current measurements on a 7.5 kW parallel single-phase PWM rectifier are presented. These results validate the effectiveness of the proposed method.
机译：电源转换器中的接地泄漏电流是一个主要问题，由于安全方面的考虑，它具有严格的限制。由于共模（CM）电压中的开关动作而导致高dv / dt的高频脉冲的存在，导致具有大di / dt尖峰的电流波形注入地面并引起高电磁干扰（EMI）噪声级。在这项研究中，提出了一种新的方法来使单相并网逆变器的CM电压为正弦波，并且没有高频脉冲。所提出的方法由两个并联的H桥功率转换器组成，它们使用载波交角为180°的单极性脉宽调制（PWM）。所提出的方法将接地泄漏电流减小了一个数量级以上。提出了一种对LCL滤波器的新颖修改，该修改进一步将泄漏电流降低了48％。结果表明，这些修改使整个系统对电路的非理想性不敏感。给出了基于7.5 kW并联单相PWM整流器的接地泄漏电流测量结果的实验​​结果。这些结果验证了该方法的有效性。

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