新型单相T型五电平非隔离光伏逆变器  

A Novel Single Phase T-type Five Level Transformerless Photovoltaic Inverter

作　　者：黄春平[1] HUANG Chunping(School of Information Engineering,Zhongshan Polytechnic,Zhongshan 528404,Guangdong,China)

机构地区：[1]中山职业技术学院信息工程学院,广东中山528404

出　　处：《电气传动》2021年第14期8-12,共5页Electric Drive

基　　金：广东省质量工程项目(GDJG2019490);中山市科技项目(2014A2FC386);2014年度广东教育教学成果奖培养项目(GD20141727);中山职院科研重点项目(KYA2104)。

摘　　要：提出了一种基于传统单相H桥拓扑和T型NPC拓扑相结合的五电平非隔离单相光伏并网逆变器拓扑结构,该拓扑包括两种结构,即通常的单相全桥和T型中点钳位结构。该拓扑通过一个由双向开关管组成的T型中点钳位结构来获得五电平,称之为T型五电平拓扑。具体分析了该新型拓扑的工作模态与共模漏电流抑制能力,该新型拓扑具有较高的效率,具有较低的泄漏电流,相比于传统的三电平拓扑具有很小的并网电流谐波和较低的开关管电压应力,可以减少并网逆变器的滤波成本和开关管器件成本。最后通过仿真和实验验证了理论的正确性。所提出的T型五电平拓扑符合非隔离光伏并网逆变器的相关标准,适用于光伏逆变器市场。A five-level transformerless single-phase PV grid-connected inverter topology based on the combination of traditional single-phase H bridge topology and T-type neutral point clamped(NPC)topology was proposed.The topology includes two structures:the usual single-phase full-bridge and the T type NPC structure.A T type NPC structure consisting of a two-way switch tube was used to obtain five levels in this new topology,which called T type five-level topology.The working mode and common mode leakage current suppression ability of the new topology were analyzed in detail.The new topology has high efficiency and low leakage current.Compared with the traditional three-level topology,it has very small grid-connected current harmonics and low switch voltage stress,which can reduce the filtering cost and switch device cost of grid-connected inverter.Finally,the correctness of the theory was verified by simulation and experiment.The proposed T type five-level topology meets the relevant standards of transformerless PV grid-connected inverters and is suitable for the PV inverter market.

关 键 词：光伏并网 漏电流 多电平逆变器 非隔离 

分 类 号：T464[一般工业技术]