集成滤波电感变压器在10 kV箱式变电站谐波治理中的应用

针对10 kV变电站谐波污染问题，提出了一种将特定次滤波电感集成于配电变压器中的技术方案，避免了传统无源滤波装置中空心电抗器占用空间大或铁心电抗器噪音严重的缺点。首先分析了将滤波电感集成于变压器中的解耦技术；然后对某一容量800 kVA的样机进行有限元仿真，理论分析降阶电感矩阵法，计算出变压器绕组间耦合度和电感矩阵，并以电感矩阵为接口进行系统的场路耦合仿真；最后对样机滤波效果进行实验测试。仿真和实验结果表明：集成滤波电感配电变压器能达到很好的谐波抑制与无功补偿效果，且集成滤波电抗器具有与变压器其它绕组低耦合、占用空间较小、不增加噪音等特点。

Application of Integrated Filtering Inductors Transformer in Harmonic Suppression of 10 kV Prefabricated Substation

Considering the serious harmonic pollution of a 10 kV prefabricated substation, a novel technical scheme is proposed to integrate specific order filtering inductors into the distribution transformer, thus avoiding the large space occupied by an air-core reactor in the traditional passive filtering device or the excessive noise in an iron-core reactor. First, the decoupling technique of filtering inductors integrated into a transformer is analyzed. Then, based on the finite element simulation of an 800 kVA experimental prototype, the coupling matrix and inductance matrix of transformer winding are calculated by the reduced-order inductance matrix method, and the field-circuit coupling simulation of the system is carried out with the inductance matrix as interface. Finally, an experimental prototype was tested to verify the filtering effect. Simulation and experimental results show that the integrated filtering inductors distribution transformer had satisfying harmonic suppression and passive compensation. Moreover, the integrated filtering inductors had characteristics such as low decoupling with other windings, smaller occupied space, and lower noise.