摘要
A novel dual output phase-shift distribution transformer （ DOPSDT ） is proposed based on the electromagnetic filtering theory. First, its structural characteristics, winding connection mode and turn number ratio for special phase shifting are investigated. Secondly, the balance formulation of harmonic magneto-motive forces is derived and the electromagnetic filtering principle of the DOPSDT is introduced. The harmonic mitigating performance under different nonlinear load conditions are also analyzed using the field-circuit coupled method, The analysis results show that the DOPSDT can mitigate the primary current distortion even under severe nonlinear load conditions. By applying the zero sequence flux cancellation and phase-shift techniques at their secondary windings, the DOPSDT can significantly reduce the 3rd, 5th, 7th, 9th, 15th, 17th and 19th harmonics within its secondary windings.
提出了一种基于电磁滤波原理的双输出移相配电变压器. 首先,研究了其结构布置特征、绕组联接方式及实现特定移相角的匝数匹配关系. 其次,推导了该变压器的谐波磁势平衡方程,论述了变压器实现电磁滤波的机理. 通过建立该变压器的场路耦合模型,对不同非线性负载情况下的谐波抑制特性进行了分析计算. 研究结果表明,在严重的非线性负载情况下,双输出移相变压器仍可以有效抑制一次侧绕组输入电流的谐波; 结合零序磁通消除技术和相移技术,该变压器可以将配电系统中主要存在的 3,5,7,17 和 19 倍次谐波电流抑制在二次绕组中.
基金
The Program for Special Talent in Six Fields of Jiangsu Province (2011-ZBZZ-016)
the Postdoctoral Science Foundation of Jiangsu Province (No. 0902038C)
