Analysis and Design of a Double Fuzzy PI Controller of a Voltage Outer Loop in a Reversible Three-Phase PWM Converter

Weixuan Zhang,Zhengqun Wang,Rong Ye,Yu Fang

doi:10.3390/en13153778

Weixuan Zhang, Zhengqun Wang + Show 2 more

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https://doi.org/10.3390/en13153778

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Journal: Energies	Publication Date: Jul 23, 2020
Citations: 5	License type: CC BY 4.0

Affiliation: Yangzhou University

Abstract

Aiming at the application of a reversible three-phase pulse width modulation (PWM) converter with a wide range of AC side voltage and DC side voltage, a double fuzzy proportional integral (PI) controller for voltage outer loop was proposed. The structures of the proposed controller were motivated by the problems that either the traditional PI controller or single fuzzy PI controller cannot achieve high performance in a wide range of AC and DC voltage conditions. The presented double fuzzy controller studied in this paper is a sub fuzzy controller in addition to the traditional fuzzy PI controller; in particular, the sub fuzzy controller can get the auxiliary correction of PI control parameters according to the AC side voltage and the DC side given voltage variation of PWM converter after the reasoning of the sub fuzzy controller, while the traditional fuzzy PI controller outputs the correction of PI control parameters according to the DC voltage error and its error change rate. In this paper, the traditional fuzzy PI controller can be called the main fuzzy controller, and the adaptive adjustment of PI control parameters of the voltage outer loop is the sum of the PI parameter correction output by the main fuzzy controller and the auxiliary PI parameter correction output by the sub fuzzy controller. Finally, the experimental results show that the reversible three-phase PWM converter can achieve excellent dynamic and static performance in a wide range of AC voltage and DC voltage applications by using the proposed double fuzzy PI controller.

Highlights

With the rapid development of power electronic technology in recent years, the reversible three-phase pulse width modulation (PWM) converter circuit has gradually replaced the traditional uncontrolled rectifier circuit such as a diode or thyristor because of its advantages of high power factor, low harmonic content, and energy bidirectional flow [1,2,3]
The traditional fuzzy proportional integral (PI) controller can be called the main fuzzy controller, and the adaptive adjustment of PI control parameters of the voltage outer loop is the sum of the PI parameter correction output by the main fuzzy controller and the auxiliary PI parameter correction output by the sub fuzzy controller
Considering that one operating condition corresponds to a model, the PI control parameters deduced by the mathematical model are usually the optimal parameters under the corresponding operating condition [9,10,11]

Summary

Introduction

With the rapid development of power electronic technology in recent years, the reversible three-phase PWM converter circuit has gradually replaced the traditional uncontrolled rectifier circuit such as a diode or thyristor because of its advantages of high power factor, low harmonic content, and energy bidirectional flow [1,2,3]. The traditional double closed-loop PI controller is usually used for a three-phase. PWM converter, and the PI parameters are usually obtained for a specific operating condition [7,8]. The traditional PI controller cannot adaptively change the control parameters to adapt to the changing operating conditions; in view of the change of the AC side voltage, the feedforward technology of the AC voltage is presented in reference [12], so that the converter has a certain adaptive ability to the fluctuation of the AC voltage.

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Conclusion