Analysis and Study of Resonance Monitoring and Suppression Strategies of EHV Main Transformer

Song Wei, L. Zhendong, Zhang Jinxiang, Chen Jun-fa, B. Feng, Liu Qimeng, Zhao Wei
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引用次数: 1

Abstract

Analysis of waveforms recorded at the site is made with the interferences such as excitation current, etc. excluded, on the basis of analysis of Extra-high Voltage(EHV) main transformer resonance mechanism and via inputting all previous resonance data by using the accuracy and reliability of electromagnetic transient simulation verification and monitoring methods, corresponding figure topology analysis function is configured according to monitoring result and is used to analyze the cause and condition of resonance. Resonance monitoring methods are put forward in combination of Hilbert-Huang Transform (HHT) and peaking pulse time interval and are used to judge the occurrence and mode of resonance. According to the components and harmonic content of monitored main harmonics, the resonance class of main transformer is defined automatically, multi-stage resonance prewarning, slight resonance reliable signaling and warning of background, direct action on series compensation control and protection system after heavy resonance exceeding limits are achieved, and the safety of capacitor is protected with resonance removed at the same time, on the basis of parameter setting, based on commissioning and decommissioning methods for series compensation and the output magnitude of wind generation set at load side by using root-mean-square algorithm. At the same time, automatic series compensation recommissioning and permanent lockout function of many times of heavy resonances are added at fixed time sections, automatic commissioning and switching of series compensation are realized, the occurrence of secondary resonance is avoided, and the safe and steady operation of EHV main transformer resonance is guaranteed effectively.
超高压主变压器谐振监测与抑制策略分析与研究
在分析特高压(EHV)主变压器谐振机理的基础上,利用电磁暂态仿真验证和监测方法的准确性和可靠性,输入以往所有谐振数据,对现场记录的波形进行分析,排除励磁电流等干扰。根据监测结果配置相应的图形拓扑分析功能,用于分析谐振的原因和条件。提出了结合Hilbert-Huang变换(HHT)和峰值脉冲时间间隔的共振监测方法,用于判断共振的发生和模式。根据被监测主谐波的组成和谐波含量,自动定义主变压器的谐振等级,实现多级谐振预警、轻微谐振可靠信号和后台报警,实现重谐振超标后直接作用于串联补偿控制保护系统,同时在参数设定的基础上,保护电容器的安全,消除谐振。采用均方根算法对负荷侧风力发电机组的出力进行串联补偿和调试、退役。同时,在固定时间段增加了串联补偿自动再调试和多次重谐振永久锁定功能,实现了串联补偿的自动调试和切换,避免了二次谐振的发生,有效保证了超高压主变谐振的安全稳定运行。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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