Research on DC welding machine based on quasi-PR control strategy

基于准PR控制直流电焊机的研究 Research on DC welding machine based on quasi-PR control strategy 黄小凡 HUANG Xiaofang 1 first-author 林玉婷 LIN Yuting 2 西南交通大学电气工程学院 西南交通大学电气工程学院 School of Electrical Engineering,Southwest Jiaotong University School of Electrical Engineering,Southwest Jiaotong University 西华大学电气与电子信息学院 西华大学电气与电子信息学院 School of Electrical Engineering and Electronic Information,Xihua University School of Electrical Engineering and Electronic Information,Xihua University 针对电焊机直流电源三相PWM整流器在采用传统比例积分(PI)控制时电焊机直流电源输出跟踪指令电流会存在静态误差和抗干扰能力差等问题,采用电流环内环准PR,调节输入电流和电压环外环PI,调节输出电压的双闭环控制策略,克服了传统线性PI控制的缺点。创建整体系统的仿真数学模型,分析研究SVPWM发生器和准PR控制器的控制原理。仿真结果表明,采用基于准PR的SVPWM直流电源的控制策略能很好地实现电焊机直流电源单位功率因数和电流的完全无静差跟踪,且使电焊机电源在运行时具有更强的抗干扰能力,整流品质优良。 The DC power output tracking command current of the electric welding machine has some problems such as static error and poor anti-interference ability when three-phase PWM rectifier is controlled by traditional proportionalintegral（PI）. For these problems,the quasi-PR of inner ele-ctric current loop is adopted,the PI of outer input current loop and outer voltage loop is adjusted,and the double closed loop control strategy of output voltage is also adjusted,the shortcomings of traditional linear PI control are overcome. In this paper,the mathematical model of the system is established,and the principle of SVPWM generator and quasi-PR controller is analyzed. The simulation results show that the SVPWM control strategy of DC electric welding machine based on quasi-PR can realize the complete non-static tracking of electric welding machine DC power unit power factor and current,and the electric welding machine power has good anti-interference ability and excellent rectification quality. 准比例谐振(准PR) SVPWM 电焊机直流电源 无静差 抗干扰能力 quasi-proportional resonance（quasi-PR） SVPWM electric welding machine DC power supply non-static error anti-interference ability TG434.3 2022-03-08 4 50