详细分析数字控制对400Hz大功率逆变电源特性尤其是计算延时对电感电流反馈环或电容电流反馈环带宽的影响。分析表明数字控制使得电流反馈环带宽大大减小,逆变电源无法抑制由于死区时间以及非线性负载等非线性因素产生的低次谐波,降低...详细分析数字控制对400Hz大功率逆变电源特性尤其是计算延时对电感电流反馈环或电容电流反馈环带宽的影响。分析表明数字控制使得电流反馈环带宽大大减小,逆变电源无法抑制由于死区时间以及非线性负载等非线性因素产生的低次谐波,降低了电源的性能。分析其它采用电压、电流双闭环数字控制的400Hz逆变电源必须采用幅值环作为外环控制的原因,并指出其存在的缺点。为了获得高性能的控制效果,提出一种基于谐振控制器的新型的单电压环控制策略,并分析现有文献中谐振控制器的不同离散化方法之间的关系,进而提出谐振控制器数字化实现的一种更为直接的方法。所提出的数字化控制方法简单易行,可以实现特定谐波的完全消除,即便在定点数字信号处理器(digital signal processor,DSP)上也能很好地实现。在16位定点DSP控制的三相90kVA组合式400Hz逆变电源上的线性负载以及非线性负载实验表明,该方法正确可行,性能优良。展开更多
A type of novel inverter power supply system for high-power twin-wire pulsed gas metal arc welding （GMAW） is presented mainly for dealing with the disadvantages of the conventional power supply for twin-wire pulsed ...A type of novel inverter power supply system for high-power twin-wire pulsed gas metal arc welding （GMAW） is presented mainly for dealing with the disadvantages of the conventional power supply for twin-wire pulsed GMA W of which the output power is generally difficult to increase due to limitations of the power of semiconductors and the power density of magnetic devices. In the power supplies for the master and slave arcs, the digital signal processor （DSP） TMS320F28335 is used to form the DSP- based synergic control system for parallel high-power pulsed GMA W, which achieves high-power output of two parallel inverters controlled by a single DSP ; master-slave communication is achieved by using e controller area network （eCAN）module of DSP, thas realizing anti-phase pulse output of high-power twin-wire pulsed GMA W and reducing the interference between twin arcs. The experiment results demonstrate that the designed inverter power supply system for high-power twin-wire pulsed GMAW can bring about high-power efficiency of welding, stable welding process and proper formation of welds.展开更多
文摘详细分析数字控制对400Hz大功率逆变电源特性尤其是计算延时对电感电流反馈环或电容电流反馈环带宽的影响。分析表明数字控制使得电流反馈环带宽大大减小,逆变电源无法抑制由于死区时间以及非线性负载等非线性因素产生的低次谐波,降低了电源的性能。分析其它采用电压、电流双闭环数字控制的400Hz逆变电源必须采用幅值环作为外环控制的原因,并指出其存在的缺点。为了获得高性能的控制效果,提出一种基于谐振控制器的新型的单电压环控制策略,并分析现有文献中谐振控制器的不同离散化方法之间的关系,进而提出谐振控制器数字化实现的一种更为直接的方法。所提出的数字化控制方法简单易行,可以实现特定谐波的完全消除,即便在定点数字信号处理器(digital signal processor,DSP)上也能很好地实现。在16位定点DSP控制的三相90kVA组合式400Hz逆变电源上的线性负载以及非线性负载实验表明,该方法正确可行,性能优良。
基金Supported by National Natural Science Foundation of China(No.51205136)Ph.D. Programs Foundation of the Ministry of Education of China(No.20100172120003)+1 种基金Competitive Allocation Project Special Fund of Guangdong Province Chinese Academy of Sciences Comprehensive Strategic Cooperation(No.2013B091500082)The Fundamental Research Funds for the Central Universities(Key Program)(No.2015ZZ084)
文摘A type of novel inverter power supply system for high-power twin-wire pulsed gas metal arc welding （GMAW） is presented mainly for dealing with the disadvantages of the conventional power supply for twin-wire pulsed GMA W of which the output power is generally difficult to increase due to limitations of the power of semiconductors and the power density of magnetic devices. In the power supplies for the master and slave arcs, the digital signal processor （DSP） TMS320F28335 is used to form the DSP- based synergic control system for parallel high-power pulsed GMA W, which achieves high-power output of two parallel inverters controlled by a single DSP ; master-slave communication is achieved by using e controller area network （eCAN）module of DSP, thas realizing anti-phase pulse output of high-power twin-wire pulsed GMA W and reducing the interference between twin arcs. The experiment results demonstrate that the designed inverter power supply system for high-power twin-wire pulsed GMAW can bring about high-power efficiency of welding, stable welding process and proper formation of welds.
