弧焊逆变器的频域数学模型

弧焊逆变电源是一个非线性、离散的病态系统，理论上很难得到精确的解析解。本文利用状态空间分析法建立系统的平均状态方程，经线性化后得出逆变器的数学模型，该模型为一二阶振荡环节。根据弧焊逆变器中参数配置满足（１／ＲＣ）＾２〉〉４／ＬＣ的情况，对该数学模型进行简化，将该数学模型简化成一个积分环节和一个一阶惯性环节相串联的结构。在此基础上用于频域法进行分析和校正，在理论校正参数附近取多组实际校正参数，分别进

Frequency Domain Mathematical Model of Arc Welding Converter

Because arc welding converter is nonlinear, discrete system, the exactitude analytic resolution is difficult to obtain, a average state equation is built in this paper by using state space analysis method.The mathematics model of converter is obtained after linearization.The model is a two-order oscillate element. According to the parameters in arc welding converter that are satisfied the relation (1 RC ) 2>>4 LC ,so the model can be simplified as a integer series with a one-order inertia element.Based on the model, analysis and revising in frequency domain,several parameters are taken around the theoretical revising parameter ,both resistance load and welding experiments are carried out. The results of experiments are matched with theoretical analysis. Practicality analysis have been done in the load which is sudden open circuits or short circuits, start and stop the converter. The results shows that frequency method can be used in arc welding converter. The model deputizes for the basic characteristic of the system,it is determined by the structure,parameters and the static conduct ratio of the system.It can be used in design and analysis of the arc welding converter.