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An FPGA‐based switching photovoltaic‐connected inverter topology for leakage current suppression in grid‐connected utilizations
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2020-07-07 , DOI: 10.1002/cta.2844 Davood Ghaderi 1
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2020-07-07 , DOI: 10.1002/cta.2844 Davood Ghaderi 1
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This study presents a symmetrical photovoltaic (PV)‐connected inverter topology for eliminating the common‐state leakage current in grid‐connected inverters. A new inverter topology is introduced that minimizes the leakage current, increases efficiency, and is economically viable because it consists of six power switches and two power diodes that, compared with similar ones, consist of the same element numbers. In this inverter, power losses are lower than popular topologies such as H5, H6, and HERIC, and the voltage stresses of the switches are reduced. These features are due to the unique composition of the inverter branches and the location of the switches and diodes and the formation of a suitable freewheeling path for the current. The freewheeling path separates the alternating current (AC) side from the direct current side in the converter and cuts off the PV array leakage current to the AC grid. This will improve network reliability indices and maintain conservation standards. Finally, the content of this method is validated by comparing the proposed inverter with the existing conventional topologies. A prototype has been implemented for the performance analysis of the proposed inverter and results presented.
中文翻译：
基于FPGA的开关式光伏连接逆变器拓扑，用于抑制并网发电中的泄漏电流
这项研究提出了一种对称的光伏（PV）连接逆变器拓扑结构，用于消除并网逆变器中的共态泄漏电流。引入了一种新的逆变器拓扑结构，该拓扑结构使泄漏电流最小，提高了效率并在经济上可行，因为它由六个电源开关和两个功率二极管组成，与相似的二极管相比，它们的元件编号相同。在这种逆变器中，功率损耗低于常见的拓扑（例如H5，H6和HERIC），并且降低了开关的电压应力。这些特征归因于逆变器分支的独特组成以及开关和二极管的位置，以及形成了适合电流的续流路径。续流路径将转换器中的交流（AC）侧与直流侧分开，并切断了流向AC电网的PV阵列泄漏电流。这将改善网络可靠性指标并保持保护标准。最后，通过将拟议的逆变器与现有的常规拓扑进行比较来验证该方法的内容。已实施了一个原型，用于对所建议的逆变器进行性能分析并给出了结果。
更新日期：2020-07-07
中文翻译：
基于FPGA的开关式光伏连接逆变器拓扑，用于抑制并网发电中的泄漏电流
这项研究提出了一种对称的光伏（PV）连接逆变器拓扑结构，用于消除并网逆变器中的共态泄漏电流。引入了一种新的逆变器拓扑结构，该拓扑结构使泄漏电流最小，提高了效率并在经济上可行，因为它由六个电源开关和两个功率二极管组成，与相似的二极管相比，它们的元件编号相同。在这种逆变器中，功率损耗低于常见的拓扑（例如H5，H6和HERIC），并且降低了开关的电压应力。这些特征归因于逆变器分支的独特组成以及开关和二极管的位置，以及形成了适合电流的续流路径。续流路径将转换器中的交流（AC）侧与直流侧分开，并切断了流向AC电网的PV阵列泄漏电流。这将改善网络可靠性指标并保持保护标准。最后，通过将拟议的逆变器与现有的常规拓扑进行比较来验证该方法的内容。已实施了一个原型，用于对所建议的逆变器进行性能分析并给出了结果。
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