The non-isolated inverter has been widely used in photovoltaic generation applications due to its low cost, reduced size, low weight, and high efficiency. However, when there is no galvanic isolation between the photovoltaic (PV) plant and the grid, leakage current may be generated due to the parasitic capacitor to the ground of the photovoltaic (PV) plant, which brings electromagnetic interference (EMI) and security problems. The main idea of this article is to construct a step-up voltage source inverter with two low-voltage input sources. The proposed inverter integrates a step-up dc–dc converter and a modified step-up dc–dc converter that has the advantages of a simple structure and strong voltage boosting capability. Moreover, the negative polarity of a solar cell and the neutral point of a power grid are linked together, which can greatly reduce the leakage current and improve the reliability and efficiency of the PV system. The operating principle, modulation strategy, and static behavior of the proposed inverter are described in detail. To verify the effectiveness of the proposed structure, a 250w laboratory test setup is established, and test results have been shown.

非隔离式逆变器由于其成本低、体积小、重量轻、效率高等优点，在光伏发电应用中得到了广泛的应用。然而，当光伏（PV）电站与电网之间没有电流隔离时，由于光伏（PV）电站对地的寄生电容可能会产生漏电流，从而带来电磁干扰（EMI）和安全问题。 . 本文的主要思想是构建一个具有两个低压输入源的升压电压源逆变器。所提出的逆变器集成了一个升压DC-DC转换器和一个改进的升压DC-DC转换器，具有结构简单和升压能力强的优点。此外，太阳能电池的负极性和电网的中性点连接在一起，可以大大降低漏电流，提高光伏系统的可靠性和效率。详细描述了所提出逆变器的工作原理、调制策略和静态行为。为了验证所提出结构的有效性，建立了一个 250w 的实验室测试装置，并显示了测试结果。