AUTHOR=Yang Guang , Zhu Yong , Zen Fanxing , Zhou Shengzhi , Chen Yuhang 

TITLE=Electromagnetic transient characteristics and overvoltage suppression strategy of renewable energy-oriented power system connected by gas-insulated transmission lines

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.991355

DOI=10.3389/fenrg.2022.991355

ISSN=2296-598X

ABSTRACT=With the increasing penetration of renewable energy sources into the main power grid, the unstable output of these new energies requires the insulation design of power transmission system to be stronger, and highly safe in operational conditions. Gas-insulated line (GIL) is an optimal solution to the power delivery for renewable energy, due to its large power transmission capacity, low energy loss and stable operation. However, the usage of GIL equipment in renewable energy-oriented power system could cause great electromagnetic interference to the electronic equipment due to the compact layout of the equipment and the transient signals generated by normal operation, which could seriously restrict the development of smart grid and become a major threat to the grid connection of new energy sources. In order to study the characteristics and evolution mechanisms of transient electromagnetic interference signals of GIL equipment during the transmission and transformation of renewable energy, this paper proposes a dynamic arcing calculation model based on optimized arcing extinguishing criterion, verifies the correctness of the improved dynamic arcing calculation model through theoretical analysis, simulation calculation combined with test measurement data. The simulation results were comprised and analyzed with test measurement data to study the transient electromagnetic interference source signals during the arcing burning period. The simulation results and test data are compared and analyzed to study the pulse steepness, wave-head size and overall waveform developing trends of the transient electromagnetic interference source signals during the arcing burning process. It is concluded that the dynamic arcing calculation model based on the optimized arc extinguishing criterion can be used to study the transient electromagnetic interference signals in GIL equipment. Meanwhile, the transient electromagnetic interference signals have the characteristics of large amplitude and high frequency, the maximum overvoltage  reach over 1.9 p.u., the UHF  reach 30MHz, and the wave-head rising time is about 12 ns. This study provides a theoretical support for subsequent research on suppressing transient electromagnetic interference source signals, improving the anti-electromagnetic interference performance of electronic devices, and is dedicated to solving the obstruction problem in the process of power delivery of new energy through GIL to distributed network