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首页> 外文期刊>Power Electronics, IET >Highly efficient and reliable inverter concept-based transformerless photovoltaic inverters with tri-direction clamping cell for leakage current elimination
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Highly efficient and reliable inverter concept-based transformerless photovoltaic inverters with tri-direction clamping cell for leakage current elimination

机译：高效可靠的基于逆变器概念的无变压器光伏逆变器，带有双向钳位单元，可消除漏电流

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摘要

Single-phase transformerless inverters are widely employed in grid-connected photovoltaic systems, because they are light, inexpensive and most importantly, have high conversion efficiencies. The highly efficient and reliable inverter concept (HERIC) is a well-known topology for transformerless inverters. Theses inverters, however, suffer from high-frequency leakage current generated by parasitic parameters. The mechanism behind the leakage current is described in this study. The concept of tri-direction clamping cell (TDCC) applied to HERIC-based transformerless inverters is proposed to eliminate the leakage current. This is achieved by clamping the freewheeling voltage to the midpoint voltage of the DC bus capacitors. A derived HERIC-based inverter has been selected to be connected with a TDCC that is constructed from three active switches in Y-type connection. This circuit is analysed in detail as an example in order to investigate the circuit performance. The experimental results show that the derived inverter has the advantages of leakage current elimination, high conversion efficiency and low grid current total harmonic distortion.
机译：单相无变压器逆变器因其轻巧，便宜且最重要的是具有高转换效率而广泛用于并网光伏系统。高效可靠的逆变器概念（HERIC）是无变压器逆变器的众所周知的拓扑。然而，这些逆变器遭受由寄生参数产生的高频泄漏电流。这项研究描述了泄漏电流背后的机理。提出了将三向钳位单元（TDCC）应用于基于HERIC的无变压器逆变器的概念，以消除泄漏电流。这可以通过将续流电压钳位到直流总线电容器的中点电压来实现。已选择派生的基于HERIC的逆变器与TDCC连接，该TDCC由Y型连接中的三个有源开关构成。为了研究电路性能，以该电路为例进行了详细分析。实验结果表明，该逆变器具有消除漏电流，转换效率高，电网电流总谐波失真低的优点。

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