文章基本信息

标题：Grid-Forming Converter Angular Speed Freezing to Enhance Transient Stability in 100% Grid-Forming and Mixed Power Systems
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作者：Xianxian Zhao ; Damian Flynn
期刊名称：IFAC PapersOnLine
印刷版ISSN：2405-8963
出版年度：2022
卷号：55
期号：9
页码：425-430
DOI：10.1016/j.ifacol.2022.07.074
语种：English
出版社：Elsevier
摘要：AbstractThe transient stability of a power system depends on the relative divergence of angular speeds between voltage sources during a fault disturbance. A unified angular speed control strategy is proposed here for grid-forming and synchronous machine voltage sources. Specifically, for a system consisting only of grid-forming converters (GFs), the virtual angular speed of all GFs is proposed to be frozen to the pre-fault value, while for a system with a mix of grid-forming converters and synchronous machines (SMs), the virtual angular speed of the GFs should be frozen to the weighted mean of the SM rotor speeds. The proposed freezing techniques are designed to be effective for short-circuit faults, and to be indifferent to phase-jump events. Simulation studies are performed on 100% GF and mixed GF/SM systems for both 3-phase fault and phase-jump events, for a range of GF control settings and system conditions, to demonstrate the effectiveness of the virtual angular speed freezing techniques.
关键词：KeywordsGrid-forming converterssynchronous generatorstransient stabilityvirtual angular speedsynchronization stabilityshort-circuit faultsphase-jump disturbances