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作 者:王顺亮[1] 何坤[1] 周俊杰 马俊鹏 刘天琪[1] 辛清明 李欢 WANG Shunliang;HE Kun;ZHOU Junjie;MA Junpeng;LIU Tianqi;XIN Qingming;LI Huan(College of Electrical Engineering,Sichuan University,Chengdu 610065,China;China Southern Power Grid Research Institude Co.,Ltd.,Guangzhou 510663,China)
机构地区:[1]四川大学电气工程学院,四川成都610065 [2]南方电网科学研究院有限责任公司,广东广州510663
出 处:《电力自动化设备》2024年第9期219-224,共6页Electric Power Automation Equipment
基 金:国家自然科学基金资助项目(51977135)。
摘 要:变压器直流偏磁会导致铁心半周饱和,可能导致高压直流输电系统中谐波不稳定现象发生。为实现对直流偏磁条件下变压器运行工况的精确模拟,基于能量守恒式及Langevin方程对原Jiles-Atherton(J-A)模型进行修正;进一步提出了适用于修正J-A模型参数辨识的改进遗传算法,提高了传统遗传算法的全局搜索精度和收敛速度。在PSCAD/EMTDC中基于修正J-A模型搭建了非线性磁滞电感,在此基础上建立变压器仿真模型;基于等比缩小的变压器实物进行直流偏磁实验,将励磁电流仿真波形与实验波形进行对比。结果表明:修正的J-A模型物理意义更加明确,改进遗传算法具有更高的精度和更快的收敛速度,所建变压器模型与实验结果吻合度很高,验证了所提建模方法的准确性。DC bias magnetization of transformers can lead to half-perimeter saturation of the core,which may cause harmonic instability in high-voltage DC transmission systems.To realize the accurate simulation of transformer operating condition under DC bias magnetization,the classical Jiles-Atherton(J-A)model is modified based on the energy conservation equation and Langevin equation.In addition,an improved genetic algorithm for parameter identification of the modified J-A model is proposed,thus,the global search accuracy and convergence speed of the traditional genetic algorithm are improved.A nonlinear hysteresis inductor based on the modified J-A model is built on PSCAD/EMTDC,and a transformer simulation model is established.A DC bias experiment is conducted on a practical down-scale transformer.The simulative waveforms of excitation current are compared with the experimental waveforms,the results show that the physical meaning of the modified J-A model is clearer,the improved genetic algorithm has higher accuracy and faster convergence speed,and the simulated transformer model matches well with the experimental results,which verifies the accuracy of the proposed modeling method.
关 键 词:直流偏磁 Jiles-Atherton模型 遗传算法 变压器建模 PSCAD/EMTDC
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