In order to reduce the distortion rate of grid-connected inverter,an automatic control method of grid-con-nected inverter current based on double constraint is proposed.Taking a typical three-phase LCL grid-connected in-verter as an example,the running state of the inverter is analyzed.The influence of harmonics on grid-connected cur-rent is determined and the loop gain function of grid-connected inverter is calculated.The improved damping control method of output current feedforward is adopted to realize automatic current control,and the double constraint princi-ple of global-local stability is introduced to determine the best resonance suppression parameters and improve the control effect of current.The test results show that the current distortion rate of grid-connected inverters is lower than 5%.During the current jump process,the jump current result can be effectively controlled within 0.2 s.
关键词
双重约束/并网逆变器/自动化控制/谐振抑制参数/增益函数/运行状态
Key words
dual constraints/grid connected inverter/automation control/resonance suppression parameters/gain func-tion/running state
维普
万方数据