用于光控阀改造的壳式电抗器的设计及验证

Design and verification of shell reactor for retrofit of light triggered thyristor valve

常规直流换流阀中每个阀模块都包含有至少一台饱和电抗器,其作用是保护晶闸管不被过大的电流电压变化率损坏。目前工程中应用的饱和电抗器主要有芯式和壳式两种结构,分别应用于光控型和电控型换流阀中,但芯式电抗器由于设计问题在工程中曾出现铁心下沉、接口漏水等故障,而壳式电抗器则表现为稳定可靠,因此研制完全可替代的壳式电抗器用于光控阀改造十分关键。首先对新壳式电抗器的结构安装、电气及水路连接进行了设计,使其完全兼容光控阀,随后基于芯式和壳式两种饱和电抗器的等效电气模型进行仿真对比,并分析模型及参数对于输出特性的影响规律,从而得出新壳式电抗器的主参数设计原则,最后对新壳式电抗器进行了铁心测温及可替代性验证,试验结果表明,新壳式电抗器发热合理,对晶闸管保护作用较芯式电抗器更优,满足光控阀改造需求。

In LCC valve, each module contains at least one saturable reactor(SR), which protects the thyristors from being damaged by excessive di/dt and d V/dt. There are two types of SR called core-type and shell-type,which are used in LTT and ETT valves respectively. However, due to design defects, iron core sinking and water leakage had occurred in few core-type SRs, while shell-type SRs are more reliable. Therefore, it is very important to develop new shell-type SR for replacement of core-type SRs in LTT valve. Firstly, the structural installation,electrical and water connections of the new shell-type SR are designed to make it fully compatible with LTT valve.Secondly, The influence law of the model and parameters on the output characteristics is analyzed, and the design principle of the main parameters of new shell-type SR is obtained. Finally, iron core temperature measurement and substitutable verification of the new shell-type SR are carried out. The test results show that the new shell-type SR has reasonable heating and better protection for thyristor, which can meet the needs of LTT valve retrofit.