之字形自耦变压器移相角影响分析及Matlab仿真

Phase-shift angle analysis on zigzag autotransformer and Matlab simulation

自耦变压器较传统隔离式变压器在一定程度上减小了整流系统的体积,同时自耦变压器由于其对称的设计结构使其在消除谐波、降低负载电压纹波系数方面也优于传统隔离式变压器。为适应升压场合,优化了传统移相角。分析了移相角对12脉波整流系统输入侧电流和负载电压的影响,及对12脉波整流系统之字形自耦变压器等效容量和平衡电抗器等效容量的影响。给出了新的移相角,使之字形自耦变压器能适用于二次侧电压稍大于一次侧电压的升压场合。仿真结果表明,在同匝比条件下,之字形自耦变压器较传统隔离式移相变压器容量小33%且结构对称。

To some extent,auto-connected transformer reduced the volume of rectifier compared with traditional isolated transformer.Meanwhile,the auto-connected transformer is better than traditional isolated transformer in harmonic reduction and lower load voltage ripple coefficient due to its asymmetrical structure.In terms of zigzag auto-connected transformer,the traditional phase-shift angle is optimized to adapt to step-up occasion.The effect of phase-shift angle on input current and load voltage of 12-pulse rectifier,as well as on the equivalent KVA rating of autotransformer and inter-phase reactor of 12-pulse zigzag autotransformer are carried out.A novel phase-shift angle for zigzag auto-connected transformer is proposed to satisfy step-up voltage situation.The simulation results suggest that the equivalent KVA rating of zigzag auto-connected transformer with a novel phase-shift angle is 33%smaller than traditional isolated transformer under the same turn ratio and is more symmetrical than traditional isolated rectifier.