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中文摘要：
借助PSCAD/EMTDC程序研究了特高压直流输电系统双12脉动阀组共同控制方式下的单阀组投入和退出策略,分析了阀组触发角、触发脉冲、旁路开关、旁通对和在线调整控制器相关参数之间的顺序控制、时序配合.仿真结果表明：在双12脉动阀组共同控制方式下,单阀组投入宜采用小触发角解锁方式,解除触发角限制后串入限速模块和限幅模块可以改善投入过程中的直流运行参数动态响应特性;单阀组退出时,触发角按一定速率调整到90°,并投旁通对可加速退出过程.实例仿真表明所提控制策略能够满足特高压直流单阀组投退的要求.
英文摘要：
The blocking and deblocking strategy of single converter group under the joint control mode of dual 12-pulse converter groups is studied with PSCAD/EMTDC for UHVDC power transmission system.The sequential control and timing coordination of firing angle,ignition pulse,bypass switch,bypass pair and online controller parameter adjustment are analyzed.Simulative results show that,the deblocking of single converter group should adopt small firing angle under the joint control mode of dual 12-pulse converter groups and the rate limiter and value limiter should be added in series after the firing angle limiter is disabled to improve the dynamic performance of DC operating parameters during the deblocking;while during its blocking,the firing angle should be adjusted to 90° at a certain rate and the bypass pair should be put into operation to speed up the blocking process.Case studies show that the proposed strategy meets the requirements of UHVDC single converter group blocking and deblocking operations.
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