摘要
为了进一步认识直流(DC)输电工程低压加压试验的特点,针对锦屏—苏州南±800kV特高压直流(UH-VDC)输电工程第一阶段分系统调试期间,锦屏换流站极Ⅰ低端换流阀低压加压试验过程中直流电压出现异常跌落的情况进行了详细理论分析和仿真研究。依据现场实测电压波形的特点、幅值及异常跌落周期和跌幅规律,对影响低压加压试验的试验电源、接线回路、直流系统控制系统及阀控制系统分别进行了排查研究,并且运用EMT-DC仿真软件对上述环节进行了故障模拟仿真。研究表明,低压加压试验中12脉动直流电压的前8个脉动波形正常,电压值基本保持在200V左右,第9个脉动的电压异常跌落至0V,第10、11、12个脉动的电压又回升并保持在100V左右,直至该周期结束,之后此过程每周期重复出现。由此特点推测试验过程中阀触发控制环节出现故障,导致某个阀未导通或异常触发,从而使直流电压异常跌落。在EMTDC仿真的阀不触发故障波形与现场波形完全符合,印证了推测的正确性。依据仿真结果,最终在现场发现阀触发环节中光纤回路故障,导致阀触发脉冲中断而出现异常,同时也得到了12脉动阀组中单个阀未触发情况下的典型波形。可见,通过对现场波形的详细分析以及仿真的进一步校验,发现了导致低压加压试验异常的原因,使得试验最终顺利进行并获得成功。另外,通过分析、研究,对于试验中可能出现问题的环节以及对应的异常特征有了进一步的认识,尤其是低压加压试验触发异常情况的波形特点,对于今后其他工程的建设和相关研究都有一定的参考价值。
For further understanding the characteristics of low voltage tests for direct current（DC） transmission projects,we analyzed the abnormal falling of direct voltage in the low voltage test of Pole Ⅰ valve at Jinping station during the first subsystem commissioning of Jinping—Sunan ultra high voltage direct current（UHVDC） project in China.On the basis of the characteristics of the DC voltage wave,DC voltage magnitude,and the cycle of the voltage falling,we studied the factors affecting the low voltage test,including the test power source,test circuit,DC pole control,and valve control systems,and the conclusions were verified by EMTDC simulations.It is found that the first 8 pulses of a 12 pulses cycle of DC voltage are normal at 200 V;however,the 9th pulse drops to 0 V suddenly,then from the 10th pulse to the 12th pulse,the DC voltage recovers and stays at 100 V;the process repeats in every period.Consequently,we estimated that the fault valve control system caused some valves to misfire,and led to the abnormal drop of DC voltage.The estimation was proved by the accordance of the simulated valve-non-acting waveform in EMTDC with the recorded waveforms in actual tests.According to the result,a faulty optical fiber in the firing circuit was found,and the typical waveform under one-valve failure of a 12 pulse converter in low voltage tests was obtained.The practical research and simulation revealed the reasons of abnormality.Meanwhile,a better understanding of possible problems during the test,especially the characteristics of misfiring wave,was obtained,which would be reference for following practical projects and studies.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第3期623-629,共7页
High Voltage Engineering
基金
国家电网公司科技项目(XT11201105688)~~
关键词
±800kV
直流输电工程
特高压直流
换流阀
低压加压试验
分系统调试
直流输电工程调试
±800 kV
direct current transmission project
ultra high voltage direct current
converter valves
low voltage test
subsystem commissioning
DC transmission project commissioning
作者简介
刘耀 1983-，男，硕士，工程师毕业于中国电力科学研究院，主要研究方向为高压直流输电技术及电磁暂态仿真E—mail：liuyao@epri．sgcc．com．cn
庞广恒 1987-，男，硕士，助工毕业于中国电力科学研究院，主要研究方向为高压直流输电技术及电磁暂态仿真E—mail：panggh@epri．sgcc．com．cn
李新年 1977-，男，硕士，高工毕业于东北电力大学，主要研究方向为高压直流输电技术及电磁暂态仿真E—mail：lixn@epri．sgcc．com．cn
