Regulation of voltagesource PWM converters without line voltagesensors  under unbalanced input voltage condition
DENG Zhiqi，YU Fuliang
(College of Electrical Engineering， Zhejiang University, Hangzhou 310027, China)
Abstract: Aiming at the situation that the moving of voltagesource pulse width modulation(PWM) converters without line voltage sensors under unbalanced input voltage condition, control strategy was investigated respectively. Virtual flux linkage was constructed as the synchronization source of voltagesource PWM converter. The positive and negative sequence separating method was used to reduce the even order harmonics in the dc output voltage which resulted from the odd order harmonic contents in the unbalanced input phase current. Then, the proposed control scheme was simulated and proved correctly using Matlab/Simulink. Finally, the experiment platform was built，the rectification and inversion were realized. The research result shows that the proposed control strategy has good dynamic performance.
Key words:  pulse width modulation(PWM)  converter; virtual flux linkage; sensorless; positive and negative sequence