DG‑side earth fault tolerance enhancement based on topology improvement and common and differential mode control strategy

Yong Zhang; Miao Yu; Yanghong Xia; Wei Wei

DG‑side earth fault tolerance enhancement based on topology improvement and common and differential mode control strategy

Vol. 20, No. 4, pp. 1055-1065, Jul. 2020

10.1007/s43236-020-00096-6

Abstract

Parallel distributed generation (DG) can extract power from a renewable energy source and supply it to the grid, but the exposure of DG components, such as photovoltaic panels, to the natural environment results in DG-side earth faults and common earth circulating current (CECC) problems. This study proposes an improved topology and a common and differential (C&D) mode control strategy to enhance the earth fault tolerance in parallel DG systems. First, the effects of line resistances and input voltages on CECC are analyzed through a mathematical model, and the disadvantages of the conventional buck converter are identified. Second, an additional switch in a negative pole is designed for the application of the C&D control strategy. Specifically, common-mode algorithm control is used to inhibit CECC, and differential-mode control is applied to ensure current sharing accuracy. Third, an inertial element is added to the reference voltage to restore the bus voltage produced by the differential-mode control strategy. Lastly, an experiment is conducted to verify that the proposed control outperforms conventional control in various conditions.

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Cite this article

[IEEE Style]

Y. Zhang, M. Yu, Y. Xia, W. Wei, "DG‑side earth fault tolerance enhancement based on topology improvement and common and differential mode control strategy," Journal of Power Electronics, vol. 20, no. 4, pp. 1055-1065, 2020. DOI: 10.1007/s43236-020-00096-6.

[ACM Style]

Yong Zhang, Miao Yu, Yanghong Xia, and Wei Wei. 2020. DG‑side earth fault tolerance enhancement based on topology improvement and common and differential mode control strategy. Journal of Power Electronics, 20, 4, (2020), 1055-1065. DOI: 10.1007/s43236-020-00096-6.