在弱电网中超越可控硅:电压稳定性和多余系统强度的分析评估

A. Boričić, J. R. Torres, M. Popov
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引用次数: 0

摘要

由于现代电力系统中基于逆变器的(同步)发电机数量的不断增加(减少),广泛使用的系统强度和电压稳定性评估方法背后的理论基础需要彻底修正。现有的评估方法,如短路比(SCR),往往是基于简化,可能产生不准确的,特别是在研究弱系统时。因此,可能会出现对电压稳定性的误导性估计,使系统暴露于不必要的可再生能源削减或其他不适当的补救措施,可能导致部分中断或潜在的不稳定。本文对电压稳定性评估进行了严格的分析修订,以自信地评估各种运行条件下的最大功率传输。随后,将该方法作为系统强度评估的一种改进方法加以应用。该方法在单机无限总线测试系统上进行了广泛的测试。数值结果表明,与常用的替代方法相比,该方法的评估精度明显提高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Beyond SCR in Weak Grids: Analytical Evaluation of Voltage Stability and Excess System Strength
Due to the continuous increase (decrease) in the number of inverter-based (synchronous) generators in modern electrical power systems, the theoretical foundations behind widely used system strength and voltage stability assessment methods require thorough revision. The existing evaluation methods such as the Short-Circuit Ratio (SCR) are often based on simplifications which may produce inaccuracies, particularly when studying weak systems. As a result, a misleading estimation of voltage stability can occur, exposing systems to unnecessary renewables curtailment or other inappropriate remedial actions that may cause partial disruptions or potential instability. This paper provides a rigorous analytical revision of voltage stability assessment to confidently evaluate the maximum power transfer under various operating conditions. Subsequently, the proposed approach is applied as an enhanced method of system strength evaluation. The method is extensively tested on a single-machine-infinite-bus test system. Numerical results show a notably more accurate assessment relative to the common alternative methods.
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