Fault analysis of ±800 kV UHVDC transmission converter valve and optimal design method

被引：0
|
作者：
Wang H. [1 ]
Lin Z. [1 ]
Zhang H. [1 ]
Zheng L. [2 ]
Yang S. [3 ]
Song L. [3 ]
机构：
[1] Global Energy Interconnection Research Institute, Beijing
[2] "Advanced Transmission Technology" National Key Laboratory, Beijing
[3] "High Power Electronic" Beijing Key Laboratory, Beijing
来源：
Wang, Huafeng (wanghuafeng@geiri.sgcc.com.cn) | 2017年 / Science Press卷 / 43期
关键词：
Commutation failure; DC grading resistor; Redundancy designing defect; Reverse recovery protection; Thyristor firing and monitoring unit; Valve base electronics;
D O I：
10.13336/j.1003-6520.hve.20161227010
中图分类号：
学科分类号：
摘要：
Some foreign technology route converter valves have some technical defects in the operation of ±800 kV UHVDC transmission projects, such as the commutation failure in the operation of inverter side, the too high temperature(90~100℃) of grading resistor, and valve-based electronics (VBE) redundancy design defects, etc. In order to eliminate these technical defects, the technical defect mechanism is obtained according to theoretical analysis and fault recording in the project site, and the corresponding optimal design scheme is proposed. Based on the double criteria of thyristor voltage amplitude and voltage variation rate, the reverse recovery protection circuit is proposed to avoid commutation failure due to protection misoperation. The design method of fixing grading resistor in the original thyristor radiator through the radiator adapter plate is proposed to reduce the grading resistor operating temperature, and the results of the converter valve operational test show that the grading resistor temperature is less than 63℃ under various operating conditions. The design method of VBE real-time follow-up technology in the dual systems running process is proposed to effectively avoid the converter valve fault tripping due to single-system misjudgment and ensuring the VBE can be switched without disturbance in operation. The optimized converter valve has been put into trial use in Hami-Zhengzhou ±800 kV UHVDC transmission project and has passed the local system commissioning and trial operation. The results show that the original problem has been solved, and the converter valve has been operating well for one and half years, which further improves the reliability of the ±800 kV Hami-Zhengzhou UHVDC transmission project. The optimized design scheme can be further applied to other projects. © 2017, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：67 / 73
页数：6
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