移相控制谐振软开关逆变弧焊电源控制系统的研究

首先利用控制理论对改进LCL型移相控制谐振电源系统进行分析，推导出系统各环节的传递函数；其次，对系统的准确性予以分析得出该控制系统能够跟踪阶跃信号，而对于斜坡信号系统存在稳态误差；讨论了电压扰动、电流扰动对输出的影响。对电压扰动为斜坡信号时存在的稳态误差，采取加入G5(S)校正环节的方法予以解决；对电流扰动为斜坡信号时存在的稳态误差，通过减小T，增大K2和K3的方法，使电流扰动产生的稳态误差少；最后，利用Matlab软件对控制系统进行分析计算。该控制系统稳定程度很好，动态过渡过程较好。

Research control system of soft-switch of phase-shifting modulation resouant for arc welding inverter power source

It analyzes the improved LCL phase,shifting modulation resonance power source by use of control system theory and deduces the transfer functions in different levels.Secondly,it discusses the accuracy of the system to obtain that the control system can track phase,step signal while the steady state error of slope signal system exists, also, it talks about the effect of fluctuant voltage and current on output.The steady,state error being with slope signal system of fluctuant voltage can be eliminated by joining corrective G5(S) while that being with slope signal system of fluctuant current is diminished by means of reducing T and increase K2 and K3.Finally,the control system's characteristics are analyzed with the help of the software Mat,lab.The control system is stable and possesses good dynamical characteristics.