基于双端口网络控制的多绕组变压器型可调电抗器

An Adjustable Reactor Realized by Multi-Winding Transformer Based on the Double Port Network Control

由于现有的可调电抗电感不能快速连续调节或是谐波比较严重等问题,提出了一种新的可调电抗原理:使用电压型PWM逆变器作为变压器二次侧的负载,通过对负载电流的控制,可以实现变压器一次侧等效阻抗的任意调节;采用变压器二次侧多绕组的结构,可提高可调电抗器的容量。本文采用双端口网络控制,使多绕组多模块控制系统简单稳定。通过求解多绕组变压器的支路电流方程和变压器电感矩阵,得到多绕组变压器的数学模型,并在Matlab中建立多绕组变压器型可调电抗的仿真模型。仿真与实验表明基于双端口网络控制的多绕组变压器型可调电抗具备控制简单,电感线性连续可调、响应速度快、谐波电流小的优良性能。

The existing structures of adjustable reactor can not be regulated rapidly and continuously or generate serious harmonics.A novel adjustable reactor structure is proposed in this paper.Using voltage source PWM inverter as the secondary load of linear transformer,the equivalent impedance of transformer’s primary winding can be regulated arbitrarily by controlling the inverter’s output current.Large capacity variable reactor can be realized by adopting the structure of transformer with multiple secondary windings.The control system of multi-winding and multi-module is simple and stable based on the double port network.The polygon type equivalent circuit model of multi-winding transformer is presented by solving the branch-current equation and the inductance matrix of the multi-winding transformer.The mathematical model of adjustable reactance implemented by multi-winding transformer is established in Matlab.The simulation and experimental results are given to verify the simple control,continuous-tuning,fast response and few harmonics of the novel adjustable reactance.