Abstract Commutation failure and output waveform distortion caused by lots of narrow PWM pulses which are generated using the traditional two line voltage synthesis strategy when the expected output voltage is low. Aiming at this condition, an improved line-to-line voltage strategy is presented after analyzing the characteristic of the traditional strategy and the mechanism of commutation failure caused by narrow pulse. With the improved strategy, the expected output line-to-line voltage is synthesized by the middle and minimum input line-to-line voltage in a sampling cycle. The number of narrow pulses can be reduced about 80% when the expected output voltage is low. The voltage error caused by the PWM pulses whose pulse length is shorter than a commutation time can be reduced, which decreases the harmonics of output voltage and input current. The control performance of matrix converter under low expected output voltage condition is improved. Finally, computer simulation and experiment proved the correctness and validity of the improved control strategy.
Ma Xinghe,Tan Guojun,Wang Xudong等. An Improved Two Line Voltage Synthesis Control Strategy of Matrix Converter[J]. Transactions of China Electrotechnical Society, 2009, 24(4): 126-132.
2009, Vol. 24 
