摘要
作为高压直流输电系统的核心设备之一,换流阀的安全与否直接关系到整个系统的可靠性。由于某种原因需直流输电系统过负荷运行时,应保证各设备的安全可靠运行,由换流阀的安全极限所决定的过负荷限值即为换流阀的过负荷能力。文中先讨论了影响换流阀过负荷能力的主要因素,再根据晶闸管结温和阀冷却系统冷却容量两个方面对阀的过负荷能力计算方法进行了研究,并对南方电网所辖的高肇直流输电工程中阀的过负荷能力进行了计算。
As one of the most important devices in the HVDC transmission system, the converter valve directly determines the reliability of the whole system. When the HVDC system has to operate in overload condition, the maximum current of the converter valve is defined as its overload capability to ensure the secure and reliable operation of the HVDC system. In this paper, the main factors affecting the overload capability of the converter valve are summarized, and a method for calculating overload capability of converter valve is proposed according to the thyristor junction temperature and the cooling capability of the valve cooling system. Moreover, the overload capability of the converter valve in the Anshun-Zhaoqing HVDC transmission project of the China Southern Power Grid is calculated with the roposed method.
出处
《高压电器》
CAS
CSCD
北大核心
2015年第12期33-37,共5页
High Voltage Apparatus
基金
国家自然科学基金重点项目(51037003)
国家电网公司科技重大专项(SGCC-MPLG027-2012)~~
关键词
高压直流输电
换流阀
过负荷能力
晶闸管结温
HVDC transmission
converter valve
overload capability
thyristor junction temperature
