Abstract
Aiming at the problem of output current waveform distortion caused by superimposed high frequency components in the output current of varying polarity of VPPAW power supply. A novel adaptive PID controller with automatic switching is introduced in this paper, and the controller is established based on the evolution path of the operating point of the VPPAW power supply. Compared with the traditional linear PID controller, the adaptive controller proposed in this paper is very suitable for the control of arc load with strong dynamic characteristics and can effectively improve output waveform of the welding system.
Highlights
In past decades, control system of variable polarity plasma arc welding (VPPAW) power supply has great development in control structure, control means and control laws [1], [2]
The topology of the VPPAW power supply with high frequency designed in this paper is mainly composed of variable polarity base power supply and Pulse DC power supply, where these two power supply has external characteristics of constant current, so the two DC power supply has a feedback circuit
Makes the control system adapt to the dynamic changes of the model and improves the stability of the welding power output waveform [6,7,8,9,10]
Summary
Control system of variable polarity plasma arc welding (VPPAW) power supply has great development in control structure, control means and control laws [1], [2]. The topology of the VPPAW power supply with high frequency designed in this paper is mainly composed of variable polarity base power supply and Pulse DC power supply, where these two power supply has external characteristics of constant current, so the two DC power supply has a feedback circuit. Makes the control system adapt to the dynamic changes of the model and improves the stability of the welding power output waveform [6,7,8,9,10]. In order to solve this problem, this paper designs a PID controller with adaptive capability based on the research of output characteristics of plasma welding power source under different working modes. The reliability of the adaptive controller proposed in this paper is established and verified by hardware and Simulink simulation experiments
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