Open AccessA decoupled circuital model methodology for calculating DC currents in AC grids induced by HVDC grounding current
Author(s) -
Lingyu Zhu,
Chenzhao Fu,
Hao Líu,
Dan Zhao,
Lei Su,
Habibur Rehman,
Shengchang Ji
Publication year - 2019
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0209548
Subject(s) - ground , resistive touchscreen , grid , equivalent circuit , current (fluid) , control theory (sociology) , alternating current , physics , electrical engineering , computer science , topology (electrical circuits) , voltage , engineering , mathematics , geometry , control (management) , artificial intelligence
Large currents are injected into the earth from grounding poles of HVDC systems under monopole ground return mode. The currents change the earth surface potential and result in DC currents in AC systems. This paper proposes a computationally efficient decoupled circuital calculation method for assessing the unwanted DC currents in AC grids. Firstly, the earth resistive network is acquired by simulating the DC grounding current distribution using Finite Element Method (FEM). Secondly, the earth resistive network and AC grid are combined to develop a decoupled circuital model of the overall system. The acquired model is used to calculate the DC currents in AC grids by solving a set of linear equations. The proposed method is computationally more efficient as compared to field-circuit coupled methods. In addition, its accuracy is proved by showing a close agreement between our results and field-circuit coupled model as well as the actual measurements. Finally, in Shanghai area power grid the DC currents are calculated using the proposed technique. Based on these calculations, remedial measures for reducing the DC currents in AC grid are suggested. Our research results indicate that DC currents in AC systems can be reduced by operating the two HVDC projects with opposite polarities.