دانلود رایگان مقاله انگلیسی کنترل پیش بینی مدل در ترانسفورماتور کشش الکترونیکی قدرت - IEEE 2018

Abstract

This paper focuses on the output parallel dual active bridge (DAB) dc-dc converters in power electronic traction transformers (PETT). A model predictive control with current-stress-optimized (MPC-CSO) scheme based on dual phase-shift (DPS) is proposed to improve the dynamic performance, balance the transmission power, and realize the current stress optimization. The dynamic behavior of output voltage in the next horizon is predicted accurately under the input voltage fluctuation and load disturbance conditions by developing the prediction model. In addition, the proposed MPC-CSO with DPS scheme can realize the output voltage to track the desired value directly with no overshoot during the start-up process. Combining the model predictive control and current-stress optimized scheme, the fast dynamic response and high-efficiency performance of DAB converters can be realized simultaneously. And the transmission power of each DAB cell can be selfbalanced. Finally, three control schemes consisting of traditional voltage closed-loop control (TVCL) with single phase-shift (SPS), traditional CSO control with DPS, and MPC-CSO with DPS schemes are compared in a scale-down three DAB dc-dc converter cells experimental prototype by using TMS320F28335+FPGA_6SLX45 as core controller. And extensive experimental results have verified the excellent performance of the proposed MPC-CSO scheme and associated analysis in this work.

VII CONCLUSION

Aimed at the parallel DAB modules in PETT, a model predictive control with current-stress-optimized (MPC-CSO) scheme based on dual-phase-shift (DPS) control is proposed to improve the dynamic performance and balance the transmission power. By combining the predictive control and CSO scheme, the dynamic response and the efficiency of DAB converters with transmission power self-balance can be improved at the same time when it faces with the following extreme conditions such as: start-up, load resistor step-change, input voltage step-change and the desired voltage step-change. A comprehensive experimental comparison of TVCL, traditional CSO and the proposed MPC-CSO schemes is adopted to show the salient features of the proposed MPC-CSO scheme, which can be concluded as:

1) It can always achieve transmission power balancing in various operation conditions even if the power of DAB cells steps up or down.

2) It can boost the output voltage to the desired value directly with no overshoot during start-up process.

3) It can achieve excellent dynamic response of DAB dc-dc converters under the input voltage fluctuation or load disturbance conditions, and the settling time is approximately to zero.

4) It can further improve the efficiency of DAB converters even though the same phase-shift control is adopted, especially for high voltage transfer ratio or light-load operation condition.

5) It can be extended to other phase-shift controls if the computation speed of the adopted digital controller is allowed.