改进永磁饱和铁心型故障电流限制器及其等效电路模型

发布时间：2018-06-11 23:41

本文选题：故障电流限制器 + 饱和铁心　；参考：《电网技术》2017年11期

【摘要】：提出了一种带有改进永磁模块的饱和铁心型故障电流限制器物理结构,并且给出其等效电路模型。使用永磁模块从多个方向对故障电流限制器的铁心进行激磁,显著提高了铁心内部的磁通密度,降低了对直流励磁电流的需求。同时,通过对故障电流限制器线圈之间磁通耦合关系的分析,以及使用有限元计算提取自感和互感参数,得到了故障电流限制器的非线性等效电路模型及其数值求解方法。实际制作了饱和铁心故障电流限制器试验模型,开展了相关的试验研究。试验结果表明,其限制线路短路电流效果十分显著,可以限制67.6%的短路电流峰值,及63.1%稳态短路电流有效值。且相对于不带永磁模块结构的故障电流限制器,可以减少93.75%的直流励磁电能消耗,在一定程度上解决了开环饱和铁心型故障电流限制器直流励磁的损耗问题。同时,通过试验结果与计算结果对比验证了等效电路的有效性。
[Abstract]:This paper presents a physical structure of saturated core fault current limiter with an improved permanent magnet module, and gives its equivalent circuit model. The permanent magnet module is used to excite the core of the fault current limiter from many directions, which increases the flux density in the core and reduces the demand for DC excitation current. At the same time, the nonlinear equivalent circuit model of the fault current limiter and its numerical solution are obtained by analyzing the coupling relationship between the coil of the fault current limiter and using the finite element calculation to extract the self-inductance and mutual inductance parameters. The test model of saturated core fault current limiter has been made and related experimental research has been carried out. The experimental results show that the effect of limiting the short-circuit current of the line is very remarkable, which can limit the peak value of the short-circuit current by 67.6% and the effective value of the steady-state short-circuit current by 63.1%. Compared with the fault current limiter without permanent magnetic module structure, the DC excitation energy consumption can be reduced by 93.75%, and the problem of DC excitation loss of open-loop saturated iron-core fault current limiter is solved to some extent. At the same time, the validity of the equivalent circuit is verified by comparing the experimental results with the calculated results.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家自然科学基金资助项目(51677064)~~
【分类号】：TM471

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