Abstract
In order to improve the control performance of a train auxiliary inverter and satisfy the requirements of power quality, harmonics, and unbalanced factor, this paper proposed a design method of a double closed-loop control system based on a complex state variable structure. The method simplifies the design process and takes full account of the effects of coupling and discretization. In the current closed-loop process, this paper analyzed the limitations of the proportional integral (PI) controller and simplified to P controller. In the voltage closed-loop, the paper employed the PI controller plus the resonant controller, designed the parameters of the PI controller. and analyzed the optimal discretization method of the resonant controller under dq axis coupling. Finally, experiments and simulations were conducted to show that the proposed method can achieve the above improvements.
Highlights
Rail transportation is developing fast in China
The unbalance factor should be less than 1% under a 10% unbalanced load, and a three-phase
In view of the above problems, considering the influence of low switching frequency and dq axis coupling on the stability in the rotating coordinate system, in this paper, we redesigned the controller, and studied the optimal discretization method of the advanced resonant controller; as a result, the auxiliary inverter showed excellent waveform control performance, satisfied the performance requirements, and greatly simplified the control strategy
Summary
Rail transportation is developing fast in China. The auxiliary inverter is an important part of rail transit trains, and its function is to convert DC 1500 V or DC 750 V to AC 380 V to supply power to auxiliary equipment. Rated switching frequency canvoltage be controlled at about 1inverter kHz, and the efficiency requirement be power above (DC) bus of the auxiliary is generally. This work aimed to use simple inverter topology to enhance the overall reliability of the train, and aimed to have excellent waveform control ability and reduce the complexity of the the train, and aimed to have excellent waveform control ability and reduce the complexity of the control strategy For this reason, the double closed-loop control strategy in the rotating coordinate control strategy. In view of the above problems, considering the influence of low switching frequency and dq axis coupling on the stability in the rotating coordinate system, in this paper, we redesigned the controller, and studied the optimal discretization method of the advanced resonant controller; as a result, the auxiliary inverter showed excellent waveform control performance, satisfied the performance requirements, and greatly simplified the control strategy. Simulations and experiments are provided to testify the validity of the proposed control strategy in the fourth and fifth sections
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