Mono-pole blocking accident analysis caused by inaccurate measurement of optical CT in ±800 kV UHVDC transmission system under lightning strike

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Electric Power Systems Research Pub Date : 2024-11-08 DOI:10.1016/j.epsr.2024.111212

Weirong Qian , Wenbo Li , Pengcheng Sha , Junbo Deng , Guanjun Zhang , Yuhang Shi , Dingge Yang , Hao Wu , Yanhua Han

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Abstract

The ultra-high voltage direct current (UHVDC) power transmission systems usually transmit a capacity of 6-8 GW, their stability and reliability are of vital importance to the large power grid. This paper analyses a mono-pole blocking accident caused by the inaccurate measurement of optical current transformer (OCT) when the pole line of Shaanbei-Wuhan ±800 kV UHVDC transmission system was struck by lightning. Combined with electromagnetic transient simulation of the UHVDC transmission system, digital simulation and in-plant testing of the optical CT, a comprehensive understanding of the factors contributing to the accident is achieved. It reveals that optical CT measurement anomalies were significant contributors to the misoperation of protective relays, which led to the mono-pole blocking accident. Based on the simulations of optical CT under high peak currents and high di/dt conditions caused by lightning strike, the importance of proper setting of demodulation algorithm parameters in optical CT to avoid inaccurate measurements is emphasized. Through in-plant testing and steady state current accuracy verification, the reasonableness of demodulation parameters is verified. Simulation results illustrate the challenges in measuring very fast transient current accurately, which are the premise and guarantee of stable operation of UHVDC transmission systems under lightning strike.

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雷击下 ±800 kV 超高压直流输电系统中光 CT 测量不准确导致的单极阻塞事故分析

特高压直流（UHVDC）输电系统的输电容量通常为 6-8 GW，其稳定性和可靠性对大电网至关重要。本文分析了陕北-武汉±800 kV 特高压直流输电系统杆线遭雷击时，由于光电互感器（OCT）测量不准确造成的单极闭锁事故。结合特高压直流输电系统的电磁暂态仿真、数字仿真和光学 CT 的厂内测试，全面了解了导致事故的因素。研究发现，光学 CT 测量异常是导致保护继电器误动作的重要原因，从而引发了单极闭锁事故。根据对雷击造成的高峰值电流和高 di/dt 条件下光学 CT 的模拟，强调了正确设置光学 CT 的解调算法参数以避免测量不准确的重要性。通过厂内测试和稳态电流精度验证，验证了解调参数的合理性。仿真结果说明了精确测量极快瞬态电流所面临的挑战，而精确测量极快瞬态电流是特高压直流输电系统在雷击下稳定运行的前提和保障。

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来源期刊

Electric Power Systems Research 工程技术-工程：电子与电气

CiteScore

7.50

自引率

17.90%

发文量

963

审稿时长

3.8 months

期刊介绍： Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview. • Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation. • Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design. • Substation work: equipment design, protection and control systems. • Distribution techniques, equipment development, and smart grids. • The utilization area from energy efficiency to distributed load levelling techniques. • Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.