海上风电集群与火电打捆外送系统短路比定义及影响因素分析
摘要：短路比是度量风电场接入交流系统诱发次同步振荡风险的重要指标。对于风火打捆并网运行的短路比，目前并无明确定义和详细的计算公式。由此，针对某实际规划双海上风电集群与火电打捆系统场景，提出了一种短路比计算方法，揭示计及双风电集群相互作用对次同步振荡的影响。研究结果显示，风火打捆并网对系统短路比有提升作用，相比于纯风电，能减缓短路比降低的速度，并提高次同步振荡时的稳定性。通过公式分析，风火打捆短路比3项影响因素为系统阻抗、风机配比、风火比例，三者对发生次同步振荡的临界短路比的影响比重不同，分析结果显示，风机配比对次同步振荡的影响比重最小，风火比例的影响比重最大。最后，在PSCAD/EMTDC中搭建某实际规划海上风电集群与火电打捆系统模型，验证了上述研究结果的合理性。
Abstract:The short-circuit ratio is an important indicator to measure the risk of subsynchronous oscillation induced by the access of the wind farm to alternating current system. The current short-circuit ratio does not have a clear definition and a detailed calculation formula for the short-circuit ratio of wind-fire bundled and grid-connected operation has not been given. Therefore, for an actual planning scenario of dual offshore wind power clusters and thermal power bundling system, a short-circuit ratio calculation method was proposed to reveal the influence of the interaction of dual wind power clusters on subsynchronous oscillation. The research results show that the wind-fire bundling and grid connection can improve the short-circuit ratio of the system. Compared with pure wind power, the speed of reducing the short-circuit ratio is slowed down and the stability of subsynchronous oscillation is improved. From the analysis of the formula, the three influencing factors of the short-circuit ratio of wind-fire bundling are system impedance, fan ratio, and wind-fire ratio. The analysis results show that the fan ratio has the least impact on the subsynchronous oscillation, and the wind-fire ratio has the greatest impact. Finally, a model of an actual planning offshore wind power cluster and thermal power bundling system was built in PSCAD/EMTDC to verify the rationality of the above research results.
标题：海上风电集群与火电打捆外送系统短路比定义及影响因素分析
title:Definition and Influencing Factors of Short-Circuit Ratio Between Offshore Wind Power Cluster and Thermal Power Bundling System
作者：陈作舟, 余浩, 王盼盼, 陈鸿琳, 陈武晖
authors:Zuozhou CHEN, Hao YU, Panpan WANG, Honglin CHEN, Wuhui CHEN
关键词：海上风电,风火打捆,短路比,系统解耦,次同步振荡,
keywords:offshore wind power,wind and fire bundling,short-circuit ratio,system decoupling,subsynchronous oscillation,
发表日期：2022-04-30
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