Performance Analysis of Multiconductor Cable With Distributed Parameters for Electromagnetic Application

The shield multiconductor cable has been widely utilized in smart power grid with the characteristics of compact structure, low loss, high current carrying capacity and less environmental pollution. To achieve the accurate estimation of shield multiconductor cable for electromagnetic application, the partial element equivalent circuit (PEEC) topology with high-frequency parasitic parameters is established, and the distributed parameter model with <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Γ</i> topology is proposed to describe the dynamic transmission features. The skin and proximity effect of shield cable can affect current distribution density, and the trivial solution with insufficient model estimation accuracy will result in the fitting residuals. Thus the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">R-L</i> ladder based on <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</i>-branch topology is analyzed, and the vector fitting iteration strategy achieves the accurate approximation and fast convergence for the estimation model. Considering the continual charging and discharging characteristics caused by high-frequency <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dv/dt</i> and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">di/dt</i>, <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Neumann Law</i> and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Mirror</i> theory are employed to derive the partial capacitance of shield multiconductor cable model. Finally, the simulation and test results with the presented cable model for conducted EMI assessment are performed on the test bench, the reliability of the parameter estimation is experimentally verified and its effect on high-frequency conducted interference is accurately characterized.