变压器多导体传输线模型简化计算方法

摘要

When using multi-conductor transmission line model for calculating broadband parameter of transformer port, there is a problem of larger scale of parameter matrix which is in turn unit.Therefore,this paper proposes a method of wind-ing MTL model for optimization reduction which considers uneven distribution of coil voltage caused by very fast transient wave invasion into transformer and gives up reduction for a part of wire turns near to wave end.Meanwhile,simplification is proceeded for surplus windings and reduction formula is deduced.In frequency domain,decoupling solution was done for MTL model while optimization reduction method was applied in a 1 0 kV single-phase transformer in laboratory.Admittance result and measuring result were basically agreed.Reduce matrix scale from 2 727×2 727 to 1 821×1 821 and get basically i-dentical admittance calculating values before and after reduction.Comparison result indicated that this optimization reduction method was effective and feasible.%应用多导体传输线(multi-conductor transmission line,MTL)模型对变压器端口宽频参数进行计算时,存在以匝为单位的参数矩阵规模较大的问题,为此提出绕组MT L模型优化降阶的方法。考虑特快速暂态波形侵入变压器造成的线圈电压不均匀分布的因素,对靠近入波端的一部分线匝不进行降阶,对剩余绕组进行简化,并推导出降阶公式。在频域范围内对 MTL 模型解耦求解,将优化降阶方法应用到实验室一台10 kV 单相变压器中,导纳的计算结果和测量结果基本一致；将矩阵规模由2727×2727降至1821×1821,降价前后的导纳计算值基本吻合。对比结果表明优化降阶方法是有效和可行的。