As an electric and electron component , the application field of thyristor is very wide . to these days , in the fields of direct current transfer , reactive power compensator , etc , thyristor still play an important role 晶闸管作为一种电力电子器件，在强电领域有着极为广泛的应用，迄今为止，在直流输电、无功补偿等方面仍占据举足轻重的地位。
This paper introduces the types of hvdc faults and the causes of hvdc pole blocking and analyzes the effects of hvdc pole blocking on power system stability , taking some hvdc projects for example and highlighting gaopo - zhaoqing hvdc project 介绍了直流故障的类型和直流闭锁的原因，重点以高肇直流输电系统为例分析了直流闭锁对电力系统稳定的影响。
This thesis first introduced profibus technology , second studied profibus - dp witch is one of profibus protocols , and applied it into hign voltage direct current transmit ( hvdc ) control and protect system ' s field control 本文论述了较为流行的profibus现场总线技术，针对profibus中的一种profibus - dp协议进行了详细研究，并将其应用到高压直流输电控制保护系统的现场级控制中。
A six - order dynamic model is established for a single - machine infinite bus system with parallel ac / dc transmission lines , in which the dynamic regulating process of the generator and hvdc are considered comprehensively , and the excitation controller is neglected 基于单机无穷大交直流并联系统,忽略励磁控制器,综合考虑发电机和直流输电系统的动态调节过程,建立六阶动态模型。
This dissertation proposes a new approach to nonlinear active and reactive power modulation control design for multi - infeed hvdc systems , which realizes the emergency power support to ac system in the presence of large disturbances occurred in ac system 将己有的基于线性方法的有功及无功调制策略由单馈入直流输电系统推广至多馈入直流输电系统，并提出一种非线性的有功及无功调制方法。
The ultrahigh - voltage direct current ( uhvdc ) link comprises two substations and a power transmission system using breakthrough technology to transmit electricity at ultrahigh voltage ( 800 kilovolts ) , which will minimize the amount of power lost in transmission 该超高压直流输电( uhvdc )线包括两个变电站以及一个采用了突破性超高压（ 800千伏）电力传输技术的电力传输系统，这将减少传输过程中的电力损失。
The main works are organized as follows : a nine - order dynamic model is established for a single - machine infinite bus system with parallel ac / dc transmission lines , in which the dynamic regulating process of the generator , excitation controller and hvdc are considered comprehensively 论文的主要内容包括:基于单机无穷大交直流并联系统,综合考虑发电机、励磁控制器和直流输电系统的动态调节过程,建立九阶动态模型。
