基于有限元分析的潜艇直流输电线路电感计算

摘要

[目的]潜艇直流电网的输电电缆敷设特殊,传统的线路电感计算方法得到的数值与实际系统中的电感值之间存在较大误差,为了减小计算误差,研究采用有限元分析法计算输电线路电感值.[方法]阐述潜艇直流输电电缆的特点,讨论常用线路电感计算公式在潜艇直流输电线路电感计算中的适用性.搭建实艇短路模拟物理实验系统,测量实验系统线路电感参数,同时在 ANSYS/Maxwell软件中采用有限元法计算电感值.在Matlab/Simulink软件中仿真试验系统,依据计算电感值建立等效电路模型,对比分析短路电流仿真波形和实测波形.[结果]研究结果表明,采用有限元分析法能够有效提高潜艇直流输电线路等效总电感值计算精度,更好地适应潜艇直流电网的暂态计算需求.[结论]可为后续仿真模型开发、算法研究提供支持.%[Objectives]Because of the characteristics of submarine direct current(DC)transmission cables,traditional circuit inductance calculation methods are unable to fit the system.There is a big error between the calculating value and the actual value.This paper studies the finite element method to reduce the calculation error.[Methods]The applicability of common line inductance calculation formulas to submarine DC system is discussed firstly.Then a short-circuit testing system is set up.The inductance of circuit in the system is measured,and a simulation model of the testing system is established. For a comparing purpose,the total inductance of the line is calculated by finite element analysis in the ANSYS/Maxwell software too. With the inductance values,the equivalent circuit model of the testing system is simulated in the Matlab/Simulink software. The simulation waveforms of the short-circuit current and the measured waveform are analyzed and compared.[Results]The result shows that the finite element analysis method is able to improve the accuracy of calculation of submarine DC transmission line equivalent inductance,and reduce the error in DC power system transient analysis.[Conclusions]The achievement can provide support for further simulation model development and calculation method research.