谢宇哲,王杨,贺艳华,陈海盟

• 1:国网浙江省电力有限公司宁波供电公司
• 2:四川大学电气工程学院

摘要(Abstract)：

近年来，国内外发生了多起涉及新能源电站的谐波谐振事故。频率扫描法由于操作简单、物理意义明确等优点，在工程中被广泛应用于系统谐振评估。在建立大型新能源电站电磁暂态仿真模型并进行频率扫描时，通常使用单台或多台机组来代替大型新能源电站，以降低建模复杂度，然而该做法在高频谐波谐振问题中的适用性还未能得到有效揭示。为此，以某大型光伏电站为例，利用自下而上建模法建立了光伏电站详细阻抗模型，并在此基础上采用等功率损耗原则建立了其动态等值模型，通过实际场站参数对2种模型进行了详细的对比分析。研究结果表明，集电线路串联阻抗对于谐波模型影响较小。为此提出了采用对地电容代替π型电路的简化动态等值模型。通过等功率损耗法建立的等值模型可以准确反映光伏电站的谐波谐振特性，而忽略集电线路电感所得的等值模型适用于分析光伏电站的中低次谐波谐振分析。

关键词(KeyWords)： 大型光伏电站;动态等值;适用性;谐振;谐波谐振

Abstract:

Keywords:

基金项目(Foundation): 宁波永耀电力投资集团有限公司研发项目（KJXM2022059）~~

作者(Author): 谢宇哲,王杨,贺艳华,陈海盟

DOI: 10.19666/j.rlfd.202311174

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