| Title |
Compensation of Effects of DC-Link Ripple Voltages on Output Voltage of Two-Leg Three-Phase PWM Inverters |
| Authors |
김영신(Kim Young-Sin) ; 이동춘(Lee Dong-Choon) ; 석줄기(Seok Jul-Ki) |
| Keywords |
Two-Leg Inverter ; Dc-Link Voltage Ripple ; Scalar PWM ; Induction Motor |
| Abstract |
In this paper, a simple scheme compensating for the effect of dc-link ripple voltages on output voltage of two-leg and three-phase PWM inverters is proposed, where single-phase half-bridge PWM convertor and two-leg inverter are used. The voltage at neutral point of the dc-link is controlled so that the upper-half of do-link voltage is equal to the lower-half voltage in average concept. However, the effect of the do-link ripple voltage results in the inverter output voltage and current distortion. This effect can be eliminated by introducing a compensation voltage in switching time calculation. Also, the inverter dead time should be compensated for sinusoidal output waveform. The proposed scheme has been verified by experimental results which were obtained from the V/F constant operation of the induction motor fed by two-leg inverter. |