In order to solve the problem of increasing Total Harmonic Distortion and switching loss of Triangular Current Mode inverters near zero crossing due to high switching frequency,a quasi-constant frequency control method with varying input voltage is proposed.The maximum switching frequency of TCM current source inverter is limited by controlling the front-end input voltage,and the harmonic distortion rate of grid-connected current is reduced.Simulink was used to build a simulation model and FFT analysis of grid-connected current was carried out.The results showed that the THD of grid-connected current decreased by 0.02%compared with traditional TCM modulation method,which verified the feasibility of the proposed scheme.
关键词
逆变器/TCM/滞环电流控制/软开关
Key words
inverter/TCM/hysteresis current control/soft-switching
维普
万方数据