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.
Highlights
As an emergency mode, it’s inevitable that HVDC transmission system operated in Ground-Return Mode (GRM) occasionally
This paper focus on the Modeling and Calculation of DC current distribution in AC power grid induced under HVDC Ground-Return-Mode
When HVDC system is under ground return mode, the transformer, whose location is close to the location of electrode of HVDC system, is easier suffering from DC bias
Summary
It’s inevitable that HVDC transmission system operated in Ground-Return Mode (GRM) occasionally. Most researches are focus on the calculation and analysis of earth potential distribution induced by ground return current of HVDC before 2003. Based on specified model, [5] and [10] calculated DC currents through earthed neutral transformers by using field circuit coupling method and the resistance network algorithm. In the research report [7] by China Southern grid technology center and Tsinghua University, the fieldcircuit model was brought forward It was divided into two parts: the grounding network and the transmission line network Applying this model, DC current distribution in AC power grid under HVDC transmission’s ground return mode was analyzed. Some rules about the difference of different structure transformer and mitigation transformer’s DC bias were proposed
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Electromagnetic Analysis and Applications
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
