使用同步相量测量单元的次同步扭转相互作用研究和缓解

M. Tsebia, H. Bentarzi
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引用次数: 1

摘要

在电厂中,次同步谐振并不常见,但一旦发生,就会造成非常严重的问题和严重的破坏。为了研究和减轻同步电机和电网之间产生的共振,已经进行了许多努力,这种共振可能出现在基本频率(50赫兹)以外的频率上。结合串联电容器的电网中的自然谐振可以出现在次同步频率,并且可以是串联和并联谐振性质。对于在带有串联电容器的长输电线路附近有大量涡轮发电机串的发电厂来说,需要采用缓解技术。由于后果严重,有次同步谐振风险的电厂可以采取适当的保护措施。然而,如果电网的次同步共振频率与汽轮发电机轴的任何一个机械频率重合,则会产生扭转相互作用,称为次同步扭转相互作用(SSTI)。如果网络中特定频率的电阻尼与机械阻尼相比不足或为负,则可能导致这种次同步扭转相互作用。这种现象可能会造成汽轮发电机轴的疲劳,从而导致发电机组的故障。由于变流器控制系统和涡轮发电机之间的相互作用,也可能发生这种情况。本文以一个案例为例,介绍了由传动系统运营商和制造商开发的不同分析方法。此外,还提出了不同的减缓技术,如滤波和阻尼。此外,还演示了使用同步相量测量单元的测量原理以及对SSTI的监测和保护。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sub-Synchronous Torsional Interaction Study and Mitigation Using a Synchro-Phasors Measurement Unit
In a power plant, sub-synchronous resonance is not encountered very often, but when it occurs, it can cause a very serious problem and severe damage. Many efforts have been investigated to study and hence mitigate a resonance produced between electrical synchronous machines and the electrical grid that may arise for frequencies other than the fundamental one (50 Hz). Natural resonances in the electrical grid incorporating series capacitors can appear for sub-synchronous frequencies and can be both a series and parallel resonance nature. Mitigation techniques are required for a power plant with an extensive turbine-generator string located near a long power transmission line with series capacitors. Due to the severe consequences, power plants that risk sub-synchronous resonance (SSR) may be equipped with appropriate protection. However, if the sub-synchronous resonance frequencies of the network coincide with any of the mechanical frequencies of the turbine-generator shaft, torsional interaction that is called sub-synchronous torsional interaction (SSTI). If the electrical damping for a specific frequency in the network is insufficient or negative in comparison to mechanical damping, it may lead to this sub-synchronous torsional interaction. This phenomenon can be hazardous causing fatigue in the turbine-generator shaft, which results in the failure of the power generation unit. It can also occur due to the interaction between a control system of converters and the turbine generators. In this research paper, a study using different methods of analysis developed by transmission system operators (TSOs) and the manufacturers with one case study is presented. Additionally, different mitigation techniques, such as filtering and damping, are suggested. Furthermore, a demonstration for measuring principles as well as monitoring and protection against SSTI using a synchro-phasors measurement unit has been presented.
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