特高压直流输电换流阀运行试验合成回路研究  

Research of Synthetic Test Circuit for Operational Test of UHVDC Thyristor Valves

作　　者：周会高[1] 许钒[2] 黄超[2] 胡治龙[2] 贾一凡[2] 郑军[2] 李彦明[1] 方太勋[3] 董云龙[3] 卢宇[3] 汪大全[3] 

机构地区：[1]西安交通大学,西安710049 [2]西安高压电器研究所,西安710077 [3]南瑞继保电气公司,南京528000

出　　处：《高电压技术》2006年第12期158-163,共6页High Voltage Engineering

摘　　要：为了确保特高压直流输电用换流阀运行的可靠性,建立合成试验回路对换流阀组件进行运行试验非常重要。根据IEC60700-1标准,运行试验仅需对≥5个晶闸管级实施即具有足够的代表性。在用PSCAD仿真研究中国第1个能满足±500kV/3000A直流输电换流阀运行试验的50kV/3600A合成回路的基础上,根据其设计参数,搭建了按比例缩小的物理模型,在该物理模型上成功地通过了所有试验方式的调试,充分验证了设计的正确性;该合成试验回路能实现IEC标准规定的所有型式试验项目,即:最大连续运行方式试验、最大临时运行方式试验(α=90°)、最小交流电压试验、暂时欠电压试验、断续直流电流试验、恢复期间的瞬态正向电压试验、阀故障电流试验。基于此,仅需通过对电流源部分的扩容改造,就能实现±800kV直流输电换流阀的运行试验项目。In recent years, HVDC technology has been developing very fast with the increasing demand of electric power in China, so the first UHVDC electric transmission line of 800 kV will be built up. In China, the electric industry has opened a new era and HVDC transmission lines will be built up more and more, so it is very important to establish the STC to develop the technology of thyristor valves. In the past twenty years, the technology of the thyristor valves have developed very fast, so the power of the thyristor valves used for HVDC have become more and more higher. It is not economical to design and build a back-to-back converter station to test the thyristor valves （named as direct test）. It is considered that the synthetic test circuit is the best way to take the place of the direct test circuit. It reduces the cost of the construction and it is easier to improve the capability of the circuit. It is very important to set up a test circuit to examine the operational behavior of thyristor valves in order to ensure the safety and reliability of HVDC system. According to IEC standard, it＇s enough to test thyristor valve with not less than 5 thyristor levels. Through investigation of the existing two circuits in the world, a new model of 50 kV/3600A STC is designed. All the test duties which are required in IEC 60700-1 are successfully achieved both by the PSCAD simulation and on a physical model. The test duties include： Periodic Firing and Extinction Test （maximum continuous operating duty test： maximum continuous firing voltage test, maximum continuous recovery voltage test, heat-run test; maximum temporary operating duty test α=90°; minimum AC voltage test： minimum delay angle test, minimum extinction angle test; temporary under-voltage test; intermittent direct current test.）, Test With Transient Forward Voltage During Recovery Period; Valve Fault Current Test （one-loop fault current test with re-applied forward voltage test, multi-loop fault current test without re-applied forward voltage

关 键 词：特高压 直流输电 换流阀 运行试验 合成试验回路(STC) 

分 类 号：TM723[电气工程—电力系统及自动化] TM46