TITLE:
Research on the Optimized Network Configuration of DC Blocking Device
AUTHORS:
Chengjun Xia, Yinggeng Xie, Yun Zhou
KEYWORDS:
Unipolar Ground Mode, DC Magnetic Biasing, Particle Swarm Optimization, NSGA, DC Blocking Device
JOURNAL NAME:
Journal of Power and Energy Engineering,
Vol.2 No.9,
September
17,
2014
ABSTRACT: HVDC transmission system has
considerable impact on the surrounding power transformers when the system is running
in the unipolar ground mode, which will cause the DC magnetic biasing phenomenon
on transformers. This problem would be more serious, after commission and operation
of UHVDC transmission system in China. According to the Guangdong power grid
under the influence of DC magnetic bias seriously, but little research about
the using of blocking device, this paper proposed an optimization scheme about
the usage of blocking device combination. Firstly, the subject studied the
method of suppressing transformer neutral point DC depending on analysis the
mechanism of magnetic biasing, and then found out the changes of power grid
after using the capacitance blocking device which is popular used by Guangdong
power grid. The particle swarm optimization (PSO) has been used to find a
better way to suppress the DC in power grid, and combined with NSGA to solve
the mixed integer programming problem. The final data validation of this method
is valuable in engineering application.