Single-Phase Common-Ground-Type Transformerless PV Grid-Connected Inverters

Notice of Violation of IEEE Publication Principles “Single-Phase Common-Ground-Type Transformerless PV Grid-Connected Inverters” By Zhiling Liao, Chenchen Cao , Diancheng Qiu, and Changbo Xu In IEEE Access, Vol 7, 2019 After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE’s Publication Principles. The content of this paper contains significant similarities with the paper cited below that were presented with insufficient attribution. “Common-Ground-Type Transformerless Inverters for Single-Phase Solar Photovoltaic Systems” by Yam P. Siwakoti and Frede Blaabjerg in IEEE Transactions on Industrial Electronics, Vol. 65, No. 3, March 2018 This paper presents a family of novel common-ground-type transformerless photovoltaic (PV) grid-connected inverters, which requires only five power switches, one capacitor, and one filter. A simple dual-closed led-loop control is used to improve control stabilization and accuracy. The main advantages of proposed inverters are: 1) the leakage current is completely eliminated (unlike traditional topologies, which can only suppress leakage current); 2) the devices used are a few and the cost is low; 3) low loss and high efficiency; 4) the ability of realizing reactive power; and 5) there is no need for high DC input voltage compared with half-bridge-type topologies. The operating principle, modulation mode, and control strategy are introduced in detail. The performance of the proposed topology is compared with that of several traditional topologies. The leakage current suppression ability and efficiency of the proposed topology are superior to those of the traditional topologies. The model predictive control (MPC) is applied in the proposed topology, which is easy to realize and can accelerate the dynamic response. Finally, the simulation and experimental results of a 1-kVA prototype are given, which proves the validity of the proposed topology in PV grid-connected system.