地磁感应电流05666667

Geomagnetically Wave and
I. INTRODUCTION
suffer from strong solar storms in the year of 2012. At that time, the influence caused by the storm like a domino will affect on all aspects of the modem society [1]. The solar flares and coronal holes or the other cosmic phenomena, produced by the sunspot activity, flying to the Earth will bring about the geomagnetic storm, which will generate the earth source potential (ESP) on the surface of the Earth. The ESP, 1 1OVIkm on the earth surface and lasting a few minutes to a few hours, will generate geomagnetically induced currents or called GIC within the high-voltage, long­ distance transmission networks that include grounding neutral transformers. The GIC will cause some great influence on the
I
N January, 2009, the
u.s. National Academy of Sciences
issued a special report: scientists predict that the Earth will
happened in 2012 will cause a great influence on the power network in China needs a lot of research work to do. Sichuan is located in the low and middle latitude regions, where there is much more mountains. Due to their abundant water resource, Sichuan power grid is becoming one of the largest power sources that provide powers to the other power grids with the development strategy of "Power-transmiting from West to East". Along with the construction in recent years, the power grid rated 500kV has developed so fast in Sichuan. Because of the features of EHVAC system such as low resistance, long distance of the transmission lines and adopting three single-phase autotransformers with bulk power and so on, the effects caused on the Sichuan power grid by the solar storms would relatively more serious. Therefore, this article, combined with the structures of EHVAC transmission power grid in Sichuan and the data of ground electric field induced by the typical solar storm, has made a preliminary estimate for the GIC level in the power grid. It is expected to provide a reference to the further study on the effects brought about by the solar storms on Sichuan power grid.
EHVAC; Induced Theory; Stability
Index Terms-- Complex-Image Method; DC Magnetic Bias;
Earth Source Power Potential (ESP); Current (GIC); Geomagnetic Solar Storm; Plane Sichuan Grid; Storm; Security
2010 International Conference on Power Sliminary Study of the Influence Caused by Solar Storm on Sichuan Power Grid
Mingde Cui, Chunming Liu, Lianguang Liu, and Xinyuan Zhang
�
This work was supported in part by National Nature Science Foundation of China (50677020). Mingde Cui is with Sichuan Chengdu Electric Power Bureau, Chengdu, 610000, China (e-mail: saiyimingde@). Chunming Liu is with the School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China cm_liu@). Lianguang Liu is with the School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China Ilguang@). Xinyuan Zhang is with Sichuan Chengdu Electric Power Bureau, Chengdu, 610000, China (e-mail: zhangxinyuanI 211@ ). (e-mail: (e·mail:
power systems such as the serious half-wave saturation of
the geomag netically induced current (GIC) has been discovered
in Jiangsu and Guang dong power grids as well as in other provincial power grids with the development of the long-distance power transmission system in China in recent years, which have resulted in some latent influence on these power grids. Based on the structures of EHVAC in Sichuan, the preliminary estimate for the GIC level in Sichuan power grid had been made by use of the data of ground electric field induced by the typical solar storm with MA TLAB simulation software. The results show that the GIC influence on Sichuan power grid under the strong magnetic storm is not optimistic; it should pay a sufficient attention to this problem.
Abstract-- The high current induced by solar storm, namely
power
transformer,
overheating
and
vibration
of
the
dynamotor and misoperation of the protective relay as well as the consumption increasing of the reactive power and the overload of the static reactive power compensation capacitors [2]-[4]. The early studies suggest that the influence caused by the geomagnetic storm can be generated only in Nordic, Canada, North America or other high-latitude countries or regions. For example, the blackout on March 13, 1989 in Quebec, Canada and the blackout on October 30, 2003 in city of Malmo, Swedish were these two typical incidents caused by GIC [2], [5]. However, in recent years, with the development of long­ distance transmission system from west to east, it was found that the GIC, due to many factors, were also taken placed in the middle and low latitude regions such as Guangdong and Jiangsu provinces in China, where there are more and more serious GIC attacks that have been discovered [6], [7]. China is a country with vast territory, which covers over the high, middle and low latitude regions. And with the increasing scale of the power grids and their complicated structures and diversified operation modes, the security and stability for the high-voltage, prominent. bulk power grids the become great increasingly solar storms Therefore, whether