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A new modulation technique to reduce leakage current without compromising modulation index in PV systems

机译:一种新的调制技术,以减少漏电流而不影响光伏系统调制指数

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The transformerless grid-connected PV system suffers from leakage current and neutral voltage imbalance if three-level inverters are utilized. This paper first investigates the common-mode voltage (CM voltage) reduction/elimination methods in three-phase PV inverters, especially three-level inverters. Several mainstream common-mode voltage reduction/elimination methods, including AZSPWM, 2MV1Z, 3MV, 3MV120, are compared in terms of CM voltage reduction/elimination performance, switching losses, modulation index, linear region and neutral point voltage balancing ability. Then a new topology and modulation scheme are proposed, which reduce the frequency of the CM voltage to the order of line frequency and could reach a 100% modulation index. This method is discussed in detail and is verified by simulation.
机译:如果使用三级逆变器,无变压器网连接的PV系统遭受漏电流和中性电压不平衡。本文首先研究了三相PV逆变器中的共模电压(CM电压)减小/消除方法,尤其是三级逆变器。在CM电压降低/消除性能,开关损耗,调制指数,线性区域和中性点电压平衡能力方面比较了几种主流的共模电压减速/消除方法,包括Azspwm,2mV1z,3mV,3mV120,依次进行比较。然后提出了一种新的拓扑和调制方案,从而将CM电压的频率降低到线频率的顺序,并且可以达到100%调制指数。详细讨论该方法并通过模拟验证。

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