Transformerless Z-Source Four-Leg PV Inverter With Leakage Current Reduction

Transformerless Z-Source Four-Leg PV Inverter With Leakage Current Reduction
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具有减少漏电流功能的无变压器 Z 源四桥臂光伏逆变器

DOI:
10.1109/tpel.2018.2861896
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发表时间:
2019-05
影响因子:
6.7
通讯作者:
Blaabjerg Frede
Blaabjerg Frede
中科院分区:
工程技术1区
文献类型:
--
作者:
Guo Xiaoqiang;Yang Yong;He Ran;Wang Baocheng;Blaabjerg Frede

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由于无变压器光伏系统缺乏电气隔离,泄漏电流是最重要的问题之一。针对Z源四桥臂无变压器光伏逆变器,提出了一种新的减小漏电流的调制策略。首先,给出了共模环路模型。然后讨论了共模电压特性以及影响漏电流的因素。提出了一种新的调制策略来实现升压功能和恒定的共模电压。因此,可以有效地抑制泄漏电流。最后,在TMS320F28335 DSP和XC3S400 FPGA控制的硬件平台上,对所提出的控制策略进行了数字实现和测试。实验结果验证了该方法的有效性。
Due to the lack of electrical isolation, the leakage current is one of the most important issues for transformerless photovoltaic (PV) systems. In this paper, a new modulation strategy is proposed to reduce the leakage current for a Z-source four-leg transformerless PV inverter. First, the common-mode loop model is presented. And then the common mode voltage behavior and the effect of factors on the leakage current are discussed. A new modulation strategy is proposed to achieve the step-up function and constant common mode voltage. Therefore, the leakage current can be suppressed effectively. Finally, the proposed strategy is digitally implemented and tested on the TMS320F28335 DSP and XC3S400 FPGA controlled hardware platform. The experimental results verify the effectiveness of the proposed solution.
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