China Southern Grid Technology Center, “Influence to AC System and Other Facilities by Ground Return Currents of HVDC and the Study of Preventive measures,” Project Research Report, Electrical Engineering Department of Tsinghua University, Beijing, 2005.

has been cited by the following article:

• TITLE: Simulation on DC Current Distribution in AC Power Grid under HVDC Ground-Return-Mode

  AUTHORS: Guihua Mei, Yuanzhang Sun, Yancun Liu

  KEYWORDS: HVDC, DC-Bias, DC Distribution, Ground-Return Current, Simulation

  JOURNAL NAME: Journal of Electromagnetic Analysis and Applications, Vol.2 No.7, July 30, 2010

  ABSTRACT: This paper focus on the Modeling and Calculation of DC current distribution in AC power grid induced under HVDC Ground-Return-Mode. Applying complex image method and boundary element method, a new field-circuit coupling model was set up. Based on the calculation result with complex image method, this paper derived the modification factor for induced earth potential from practical measurement, which increased the accuracy of calculation. The modification method is helpful for evaluation on the effect of means used for blocking the dc-bias current in transformer neutral and also useful for the forecast of the DC current distribution when the power grid is in different line connection mode. The DC distribution character in Guangdong power grid is shown and suggestion is proposed that the mitigation of dc-bias should start from those substations whose earth-potential is highest.