摘要
以±800 kV 7 200 MW锦屏–苏南特高压直流输电工程为背景,对直流转换开关系统中不同转换开关的工况进行分析和仿真计算。阐释了金属回线转换开关和大地回线转换开关在特高压直流输电系统运行方式转换中发挥的作用;分析了中性母线开关和中性母线接地开关在特高压直流输电系统应对故障时发挥的作用。以金属回线转换开关为例,着重分析了直流转换开关电流转换的过程,以及恢复电压水平对转换过程的影响。采用PSCAD/EMTDC仿真计算软件,对各直流转换开关承受的电气参数进行了仿真计算研究,给出了分断电流、恢复电压水平、能量吸收值等相关参数作为特高压直流转换开关系统的设计依据。
Taking the Jinping-Sunan UHVDC project as the application background, the four kinds of transfer switches are analyzed and simulated. The functions of metallic return transfer breaker （MRTB） and ground rettma transfer switoh （GRTS） during the commutation between the metallic return mode and the ground return mode as well as the functions of neutral bus switches （NBS） and neutral bus ground switches （NBGS） during particular faults are illustrated. Taking the MRTB for example, the commutation process and the influence of the counter-voltage level on this process are analyzed. The parameters for the four kinds of transfer switch in UHVDC system are studied and calculated with Simulation in PSCAD/EMTDC. The parameters of the transfer switches such as currents to be commutated, recovery-voltage levels and the energies to be absorbed are given; and these parameters could he the criteria for designing.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第36期1-7,236,共7页
Proceedings of the CSEE
