系统次同步分量对串联变压器的影响分析  

Analysis of the Influence of System Sub-synchronous Components on Series Transformer

作　　者：杨蕊 李琳[1] 孙佳安 YANG Rui;LI Lin;SUN Jiaan(State Key Laboratory of Alternate Electrical Power Systemwith Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《电工技术》2021年第5期8-10,14,共4页Electric Engineering

摘　　要：为抑制电力系统次同步振荡,大量串联补偿装置经变压器接入电力系统,而次同步分量使变压器工作在异常状态。为研究次同步分量对变压器的影响,基于法拉第电磁感应定律推导含次同步分量时磁通表达式及影响磁通的因素,在借助有限元数值分析和变压器模型试验的基础上,研究不同次同步分量对220 V串联变压器空载原边电流波形和频谱的影响,验证次同步分量理论分析的正确性。该研究对实际工程具有参考性,有助于合理设计次同步抑制策略。In order to suppress sub-synchronous oscillation,a large number of series compensation devices need to be connected to the power system through transformers,and the sub-synchronous component makes transformers work in an abnormal state.In order to study the influence of sub-synchronous components on transformers,based on Faraday′s law of electromagnetic induction,the expression of magnetic flux with sub-synchronous components and the factors affecting magnetic flux are derived.On the basis of finite element numerical analysis and transformer model test,the influence of different sub-synchronous components on the current waveform and frequency spectrum of the no-load primary side of a 220 V series transformer is studied to verify the correctness of the theoretical analysis of sub-synchronous components.This research is of reference to actual engineering and helps to design sub-synchronization suppression strategies reasonably.

关 键 词：变压器 次同步分量 励磁电流 有限元分析 

分 类 号：TM71[电气工程—电力系统及自动化]