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首页> 外文期刊>Power Electronics, IET >Neutral point clamped transformerless grid connected inverter having voltage buck–boost capability for solar photovoltaic systems
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Neutral point clamped transformerless grid connected inverter having voltage buck–boost capability for solar photovoltaic systems

机译：中性点钳位无变压器并网逆变器，具有太阳能光伏系统的降压-升压能力

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摘要

This study proposes a neutral point clamped grid-connected transformerless inverter for solar photovoltaic (PV) systems. This inverter has the capability to function in buck-boost mode. Thus the PV voltage level can be chosen to be of lesser value as compared to that of the existing buck type of inverters. This leads to increment in yield of power when PV modules are required to operate under mismatched conditions owing to possibility of more parallel connection of PV modules. Furthermore, buck-boost nature of the proposed inverter also facilitates operation under considerable variation in PV array voltage caused by wide changes in meteorological conditions. The other advantages of the inverter include: (a) elimination of concerns pertaining to the leakage current issues in transformerless grid-connected solar PV systems, (b) elimination of grid current sensor requirement, (c) elimination of shoot-through fault etc. The operating principle of the developed inverter supported by relevant analysis is presented. Control strategy devised for the inverter is provided. Results of detailed simulation studies carried out on MATLAB/Simulink platform are presented to ascertain viability of the proposed scheme. Exhaustive experimental validation has been carried out by utilizing a scaled down laboratory prototype of the proposed inverter.
机译：本研究提出了一种用于太阳能光伏（PV）系统的中性点钳位并网无变压器逆变器。该逆变器具有降压-升压模式的功能。因此，与现有的降压型逆变器相比，PV电压电平可以选择为较小的值。由于需要更多并行连接光伏模块，因此当要求光伏模块在不匹配条件下运行时，这会导致发电量增加。此外，所提出的逆变器的降压-升压特性还有助于在气象条件发生较大变化而导致PV阵列电压发生较大变化时进行操作。逆变器的其他优点包括：（a）消除了与无变压器并网太阳能光伏系统中的漏电流有关的担忧；（b）消除了对电网电流传感器的要求；（c）消除了直通故障等。介绍了相关分析支持的已开发逆变器的工作原理。提供了针对逆变器设计的控制策略。提出了在MATLAB / Simulink平台上进行的详细仿真研究的结果，以确定所提出方案的可行性。已经利用提出的逆变器的缩小规模的实验室原型进行了详尽的实验验证。

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