CAJ | 학술논문

为了更完善、更准确地研究系统扰动对大型发电机及电网的影响，建立了机–场–路–网耦合时步有限元仿真模型，实现了多段集中质量块弹簧机械轴系–电机二维瞬态电磁场–外电路–电网的全面耦合。模型不仅充分考虑了动态过程中不同时刻电机内电磁场畸变、饱和、涡流集肤效应及输变电系统参数等重要因素的影响，同时还进一步详细考虑了机械轴系的动态过程，包括各轴段传递的扭矩、阻尼转矩及各轴段转速的不同变化等因素的影响。为验证所建模型，对水力发电设备国家重点实验室内的动模实验系统搭建了仿真模型，并对机组120°误同期并网工况进行了仿真及实验对比分析，结果表明该机–场–路–网耦合仿真模型正确、可靠。
위료경완선、경준학지연구계통우동대대형발전궤급전망적영향，건립료궤–장–로–망우합시보유한원방진모형，실현료다단집중질량괴탄황궤계축계–전궤이유순태전자장–외전로–전망적전면우합。모형불부충분고필료동태과정중불동시각전궤내전자장기변、포화、와류집부효응급수변전계통삼수등중요인소적영향，동시환진일보상세고필료궤계축계적동태과정，포괄각축단전체적뉴구、조니전구급각축단전속적불동변화등인소적영향。위험증소건모형，대수력발전설비국가중점실험실내적동모실험계통탑건료방진모형，병대궤조120°오동기병망공황진행료방진급실험대비분석，결과표명해궤–장–로–망우합방진모형정학、가고。
In order to accurately study the impact on large machine and power network of system disturbance, the mechanical shaft-field-circuit-network coupled time-step finite element model was set up. The comprehensive coupling of the multi-mass spring mechanical shaft system-2D transient electromagnetic field-circuit-power network was realized. In the model, the distortion of electromagnetic field, magnetic saturation, eddy current and parameters of power transmission system were taken into account in dynamic process, and dynamic behavior of mechanical shaft was considered in detail as well including the mechanical torque transmitted by every mass, damping torque and the speed variation of different mass. To validate the proposed model, the simulation and experimental results of faulty synchronization at 120o, performed on the dynamic simulation experimental system in State Key Laboratory of Hydropower Equipment, was compared and analyzed. The results show that the model is correct and effective.