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首页> 外文会议>2015 Intl Aegean Conference on Electrical Machines amp; Power Electronics, 2015 Intl Conference on Optimization of Electrical amp; Electronic Equipment amp; 2015 Intl Symposium on Advanced Electromechanical Motion Systems >Ground leakage current reduction in single-phase grid-connected power converter
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Ground leakage current reduction in single-phase grid-connected power converter

机译：单相并网功率变换器中的漏地电流减小

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摘要

One of the major concerns during the design of grid-connected converters is meeting the electromagnetic interference (EMI) standards. Ground leakage current is another aspect which has a stringent limit due to safety concerns. Presence of high frequency pulses, with high dv/dt due to switching actions, in common-mode (CM) voltage excite parasitic capacitances of the power converters. This results in injection of peaky current to ground and causes high EMI noise level. In this paper a new method is proposed to make the CM voltage, of a single-phase grid-connected converter, sinusoidal and free of high frequency pulses. The proposed method consists of two parallel connected H-bridge power converters, which uses unipolar PWM with carrier interleaving angle of 180°. The proposed method reduces the ground leakage current by more than an order of magnitude. A modification to the LCL filter is adopted which further reduces the leakage current by 48%. It is shown that these modifications make the overall system insensitive to circuit nonidealities. Experimental results based on ground leakage current and EMI measurements on a 7.5kW parallel single-phase PWM-rectifier are presented. These results validate the effectiveness of the proposed method.
机译：在设计并网转换器时，主要关注的问题之一是要满足电磁干扰（EMI）标准。接地泄漏电流是另一方面，由于安全方面的考虑，其限制很严格。在共模（CM）电压下，由于开关动作而产生高dv / dt的高频脉冲会激发功率转换器的寄生电容。这导致峰值电流注入到地面，并导致高EMI噪声水平。本文提出了一种新的方法来使单相并网转换器的CM电压为正弦波且无高频脉冲。所提出的方法由两个并联的H桥功率转换器组成，它们使用单​​极性PWM，载波交错角为180°。所提出的方法将接地泄漏电流减小了一个数量级以上。对LCL滤波器进行了修改，使泄漏电流进一步降低了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。给出了基于接地泄漏电流和7.5kW并联单相PWM整流器的EMI测量的实验结果。这些结果验证了该方法的有效性。

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