EMTP在特高压交流输电研究中的应用

为了使EMTP能为正在开展的特高压输变电技术服务,在简单介绍EMTP元件模型的基础上,围绕特高压交流输电研究各主要课题论述了EMTP的使用方法,因特高压线路的高电压、大电容、小电阻带来了其它电压等级所未有的技术问题,诸如零点偏移、谐振过电压、潜供电流熄灭和短时间工频过电压升高等,故需对特高压系统的这些特有现象进行详细模拟。为了降低特高压输变电设备的造价,特高压的绝缘设计不能是单纯的既有电压等级的延伸,而是需对特高压系统的过电压进行详细计算,EMTP是解决上述2个问题的最好工具。

Application of EMTP in the Research of UHV AC Power Transmission

EMTP(Electro-magnetic Transient Program) is the program to analyze the electro-magnetic transient phenomenon being used most extensively in the world.This paper introduces the EMTP modeling method first,and refers to the contributions of the author of this paper too,such as the development of phase-domain synchronous machine model and the improvement of control system and others.And then this paper introduces how to use EMTP in each research subject of UHV AC power transmission.The UHV AC power transmission is an economical and effective power transmission form,but it comes with various technological problems caused by high voltage,big charging capacity and small resistance of the ultra-high voltage transmission line,such as zero offset phenomena,resonance overvoltage,secondary arc extinction,rise of power frequency temporary overvoltage and others.Therefore,it is necessary to simulate the special phenomenon appeared in the ultra-high voltage system in detail.And in order to lower the cost of power transmission equipment of ultra-high voltage system,the insulation design of an ultra-high voltage system can not be done as just a mere extension with the current voltage level.It is also necessary to calculate the overvoltage of the ultra-high voltage system correctly.EMTP is the optimal tool for solving two above-mentioned problems.The contents mentioned in this paper will be helpful for the research of the ultra-high voltage transmission and the use of EMTP.