等离子切割电源前馈补偿双闭环复合控制策略  

Composite Control Strategy of Double Closed-loop With Feed-forward Compensation for Plasma Cutting Power Supply

作　　者：孙强[1] 陈龙[1] 陈桂涛[1] 王华民[1] 

机构地区：[1]西安理工大学,自动化信息工程学院,陕西西安710048

出　　处：《电力电子技术》2013年第5期76-78,共3页Power Electronics

基　　金：陕西省教育厅产业化培育项目(2011JG08);陕西省科技厅科技攻关项目(2011K09-05)~~

摘　　要：为满足逆变式等离子切割电源在低频引弧、弧转移及能量突变情况下的控制需求,提出了一种前馈补偿双闭环复合控制策略。通过建立等离子电弧数学模型设计电压前馈补偿器,采用一种新型三角载波电流控制方法构建电压源型变换器,以电压为内环、电流为外环设计双闭环控制。根据Simulink仿真设计TMS320F2808数字控制器。仿真和实验结果证明所提控制策略可提高系统的稳定性和鲁棒性,具有优异的动态响应能力,且电源非线性适应能力强,有效地解决了切割电源的控制需求。Under the circumstance of low-frequency pilot arc, arc transferring and energy transferring, this paper proposes a composite control strategy of double closed-loop with feed-forward compensation in order to meet the control requirements.By building up plasma arc mathematical model to design a feed-forward compensator with voltage, and to design a double closed-loop control with inner voltage-loop and external current-loop, using a novel control method with triangular carrier current control to establish voltage source converter.This paper designs digital controller with TMS320F2808 based on Simulink simulations.Simulations and experiments are given to verify that the mentioned control strategy improves system＇s stability and robustness, and has excellent dynamic responsibility.The power has well non-liner resilience, and the control requirements of plasma cutting power supply is solved effectively.

关 键 词：切割电源 等离子电弧 前馈补偿 双闭环复合控制 

分 类 号：TN86[电子电信—信息与通信工程]