感应滤波四绕组变压器及其滤波补偿装置分析

为改善220kV变电站的电能质量,提出了一种基于感应滤波技术的四绕组变压器,相比传统三绕组变压器,其增加了一个具有零阻抗设计特征的附加滤波绕组.附加滤波绕组接配套的滤波补偿装置,此变压器能够高效抑制110kV和35kV负载侧的谐波,减小220kV侧的谐波电流.对比分析了几种较为常用无功补偿容量的分配方案,确定了采用配系数分配方法设计感应滤波四绕组变压器配套滤波补偿装置的优化方案,从而实现了滤波总电感最小的目的,保证了滤波补偿装置的经济性.利用PSCAD/EMTDC软件建立了感应滤波四绕组变压器及滤波补偿装置的仿真模型.仿真结果表明,本文提出方案的滤波效果远远优于传统的三绕组变压器的滤波方案,具有良好的工程应用前景.

Analysis of Induction Filtering Four-winding Transformer and Filter Compensation Devices

In order to improve the power quality of 220 kV transformer substation, a four winding transformer based on inductive filtering technology was proposed. Compared with the traditional three winding transformer, the four winding transformer has an additional filter winding with the characteristics of zero impedance design.The additional filter winding connecting to the set of filter compensation devices can efficiently restrain the harmonic from the 35 kV and 110 kV load sides, and reduce the harmonic currents of 220 kV side. Comparative analysis of several commonly reactive compensation was studied, and match coefficient distribution method was adopted to design transformer matching filter compensation devices in order to realize the purpose of the minimum inductance, which can guarantee the efficiency of filter compensation devices. Finally, through the software of PSCAD/EMTDC, the modules of the four-winding transformer and filters are modeled, and a total simulation goes on with all modules. The results show that the induction filtering four winding transformer and its filter are much better than the traditional three winding transformer, which is applicable to practical engineering.