Hardware-Based Cascaded Topology and Modulation Strategy With Leakage Current Reduction for Transformerless PV Systems
Hardware-Based Cascaded Topology and Modulation Strategy With Leakage Current Reduction for Transformerless PV Systems
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DOI：
10.1109/tie.2016.2607163
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发表时间：
2016-09
影响因子：
7.7
通讯作者：
Xiaoqiang Guo;Xiaoyu Jia
中科院分区：
文献类型：
--
作者：
Xiaoqiang Guo;Xiaoyu Jia
研究了单相无变压器级联H桥光伏逆变器的漏电流抑制问题。建立了典型单相级联H桥光伏发电系统的高频共模回路模型。在此基础上，讨论了影响漏电流的主要因素。解释了典型单相级联H桥逆变器不能有效降低漏电流的原因。为了解决这一问题，提出了一种基于H5逆变器的级联型拓扑结构，并沿着了一种新的调制策略，保证了杂散电容电压不含高频分量。通过这种方式，可以有效地减少泄漏电流。最后，搭建了一台采用TMS320F28335DSP + XC3S400FPGA数字控制的样机。对级联H桥和提出的拓扑进行了性能测试。实验结果验证了该方法的有效性。
Leakage current reduction of the single-phase transformerless cascaded H-bridge PV inverter is investigated in this paper. The high-frequency common-mode loop model of a typical single-phase cascaded H-bridge PV system is established. Based on the model, the main factors that affect the leakage current are discussed. The reason why the typical single-phase cascaded H-bridge inverter fails to reduce the leakage current is explained. In order to solve the problem, a cascaded topology based on the H5 inverter is presented, along with a new modulation strategy, which can ensure that the stray capacitor voltage is free of high-frequency components. In this way, the leakage current can be effectively reduced. Finally, a prototype with TMS320F28335DSP + XC3S400FPGA digital control is built. The performance tests of cascaded H-bridge and the proposed topologies are carried out. The experimental results verify the effectiveness of the proposed solution.