Abstract：AC-fed railway traction drives suffer from pulsating input power because of the single-phase rectifier at the front end. LC passive filter is often installed at DC link to absorb the pulsating power. However this greatly reduces the power density. An effective approach to get rid of this bulky filter is to compensate pulse width of the traction inverter so that it does not produce harmful beat components in the output voltage/current even with a fluctuating DC link. For low switching frequency at high power level, it is difficult for conventional feed-forward compensation methods to achieve good results. A repetitive DC link voltage predictor is proposed to improve the performance. It utilizes the repetitiveness of DC ripple and can predict the average value of DC link voltage in the next switching period. An area-equalization algorithm is then used to calculate the required pulse width. Experiments show that compared with conventional methods, the proposed one can reduce the steady-state beat current by 6-7 times. The dynamic beat current during load transients is also negligible only if dynamic drop of DC link voltage is kept below 10%.
欧阳晖, 张凯, 张鹏举, 康勇, 熊健. 牵引变流器直流母线电压脉动下的无拍频电流控制方法[J]. 电工技术学报, 2011, 26(8): 14-23.
Ouyang Hui, Zhang Kai, Zhang Pengju, Kang Yong, Xiong Jian. Repetitive Prediction of Fluctuating DC Link Voltage for Traction Drives. Transactions of China Electrotechnical Society, 2011, 26(8): 14-23.
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2011, Vol. 26 
