2025年4月5日 周六
首页 > 过刊浏览>2020年第35卷第6期 >53-60. DOI:10.19781/j.issn.16739140.2020.06.007
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考虑大规模新能源接入的变压器热寿命损失分析
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付豪(1994),男,硕士研究生,主要从事电力变压器故障诊断的研究;Email:605952574@qq.com

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TM411


Analysis of transformer thermal life loss considering largescale new energy resources access
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    摘要:

    大规模新能源接入变电站带来过载、谐波、短路等问题,进而导致变压器等重要电力设备使用寿命缩短,研究变压器的热寿命损失对分析电网经济运行意义重大。该文对变压器在谐波电流作用下的功率损耗进行量化分析,引出负载系数,同时在此基础上给出考虑负载系数与谐波畸变率的热点温度计算方法。此外,考虑变压器突发短路这一特殊情况,改进绕组热点温度的计算方法,并基于热点温度建立变压器热寿命损失模型。最后,通过对某35 kV变压器的仿真分析,得到结论:在考虑新能源接入的情况下,过载运行使变压器热寿命损失急剧增大,而谐波与短路对变压器热寿命的影响甚微。

    Abstract:

    The largescale new energy accessed into a substation would bring in problems of the overload, harmonic and short circuit and then affects the life of power appliances. Therefore, it is of great significance to study the thermal life loss of transformer for the grid economic operation. Firstly, the power loss of the transformer in harmonic current is analyzed quantitatively and the load factor is derived simultaneously. On this basis, the calculation method of hot spot temperature considering the load factor and harmonic distortion rate is given. Then, considering the special case of sudden shortcircuit of transformer, the calculation method for the winding hot spot temperature is improved. Thirdly, the thermal life loss model based on the hot spot temperature of the transformer is established. Finally, the simulation analysis of a 35 kV transformer in included for verification. It is shown that after new energy resources access, the overload operation causes the great increase of the thermal life loss while the harmonic and shortcircuit have little effect on the thermal life.

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付豪,杨星磊,张斌,等.考虑大规模新能源接入的变压器热寿命损失分析[J].电力科学与技术学报,2020,35(6):53-60.
FU Hao, YANG Xinglei, ZHANG Bin, et al. Analysis of transformer thermal life loss considering largescale new energy resources access[J]. Journal of Electric Power Science and Technology,2020,35(6):53-60.

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