摘要
由于新型换流变压器具有较特殊的接线方案,其电磁特性直接关系电磁参数的设计及系统运行。基于场路耦合法,建立了新型换流变压器的场路耦合数学模型,并以某一实际新型换流变压器的原理样机数据为依据,建立了相应的有限元仿真模型;并对该新型换流变压器在投入和不投入阀侧滤波器两种工况进行仿真,通过对比两种工况条件条件下的网侧电流、感应电动势、励磁电流及铁心主磁通,结果表明:新型换流变压器在投入阀侧滤波器条件下,网侧电流中的谐波含量大大降低;感应电动势畸变率变小;励磁电流和铁心主磁通波形接正弦。新型换流变压器的电磁特性较传统换流变压器得到大大改善,有利于降低谐波对换流变压器的不利影响。
Because the new-type converter transformer has a special winding connecting scheme,its electromagnetic characteristics directly influence the electromagnetic parameters' design and system operation. In this paper,the field-circuit coupling mathematic models for the new-type converter transformer are established based on the field-circuit coupling method and the corresponding finite element simulation models are established based on the actual data for a prototype of the new-type converter transformer. Moreover,the simulations were conducted about the new-type converter transformer work in different operation conditions with-/ without filter in the valve side. The two operation conditions were compared in terms of the grid-side current,the induced electromotive force,excitation current and magnetic flux in the core. As the results show,firstly,the harmonic content in grid-side current greatly decreases;secondly,the distortion of the induced electromotive force reduces; thirdly,the waveform of the excitation current and magnetic flux approximates sine wave. The electromagnetic characteristics of the new type converter transformer have significant improvement when compared to traditional converter transformer,conducive to eliminating the harmonic adverse impact.
出处
《华东电力》
北大核心
2014年第11期2334-2338,共5页
East China Electric Power
关键词
新型换流变压器
感应滤波
谐波抑制
电磁特性
场路耦合
novel converter transformer
inductive filtering
harmonic suppression
electromagnetic characteristics
coupled field-circuit
