干式铁心电抗器电磁-热-结构多物理场耦合仿真及协同优化研究

Coupling Simulation and Collaborative Optimization of Electromagnetic,Thermal and Structural Multi-physical Fields for Dry-type Core Reactor

干式铁心电抗器长期处于电磁、热及应力等物理场中,其温升和振动问题日益严重。为了解决上述问题,提高金属导体材料的利用率,该文提出了干式铁心电抗器多物理场耦合仿真与协同优化相结合的设计方法。首先分析铁心电抗器温升及振动机理,指出影响铁心电抗器温升及振动的主要因素。然后,搭建干式铁心电抗器系统级协同优化模型。温升方面采用包封线圈-气道单元散热效率优化方法,在振动方面采用Kriging近似模型优化方法,通过灵敏性分析将设计变量划分为敏感和不敏感2个层次。最后,采用多岛遗传算法获得最佳的设计,仿真结果验证了优化设计方法的正确性。优化结果表明,该文提出的干式铁心电抗器多物理场协同优化设计方法,在满足电感、温升和振动等参数的前提条件下,绕组和铁心的用量分别减少了17.1%和6.7%,显著提高了金属导体利用率。

The temperature rise and vibration of the dry-type core reactor have become more and more serious because of its long-term exposure to the electromagnetic,heat and stress physical fields.In order to solve the above problems and improve the utilization of the metal conductor materials,a design method combining the multi-physical field coupling simulation and the collaborative optimization for the dry-type core reactor is proposed in this paper.Firstly,the temperature rise and vibration mechanisms of the core reactor are analyzed,and the main factors affecting the temperature rise and vibration of the core reactor are pointed out.Secendly,the system-level collaborative optimization model of the dry-type core reactor is established.The heat dissipation efficiency optimization method of the encapsulation coils-air duct unit is adopted for the temperature rise system,and the Kriging approximate model is adopted for the vibration optimization.The designed variables are divided into sensitive and insensitive levels through the sensitivity analysis.Finally,the multi-island genetic algorithm is used to obtain the optimal design parameters,and the simulation results verify the correctness of the optimization design.The optimization results show that the vibration,the amount of winding and core is reduced by 17.1%and 6.7%respectively under the premise of satisfying the parameter deviation range of inductance,the temperature rise and the utilization rate of metal conductor is significantly improved.