5상 유도전동기의 DTC를 위한 토크리플저감 방법
Torque Ripple Reduction Method for DTC of Five-phase Induction Motor
- 주제(키워드) 토크리플저감 , 5상유도전동기 , 직접토크제어
- 발행기관 아주대학교
- 지도교수 이교범
- 발행년도 2017
- 학위수여년월 2017. 2
- 학위명 석사
- 학과 및 전공 일반대학원 전자공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000024960
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
This paper presents an improved switching selection method for direct torque control (DTC) of five-phase induction machine. A five-phase inverter has 32 voltage vectors, including 30 nonzero and 2 zero voltage vectors. The effective voltage vector is represented as a large, medium, or small voltage vector according to its magnitude. The voltage vector magnitude is related to the torque response and torque ripple. When the large voltage magnitude value is selected, the torque response time decreases with increased torque ripple. However, when the voltage magnitude is small, the torque response time and torque ripple increase. As a result, this paper proposes an selection method of optimal voltage vector for improved DTC of a five-phase induction motor. In addition, this paper shows a torque ripple reduction method of DTC using fuzzy controller in five-phase induction machine. The conventional DTC method has some drawback. First, switching frequency changes according to the hysteresis bands gap and motor’s speed. Second, in short control period, the torque ripple is rapidly increased. To overcome this problem, the proposed method is changing the voltage vector insertion time by using the designed fuzzy controller by torque error. The proposed methods are simulated and experimentally verified on a tow-level inverter-fed five-phase induction motor drive.
more목차
CHAPTER I. INTRODUCTION
CHAPTER II. IMPROVED SWITCHING SELECTION METHOD
2.1 Voltage vector in five-phase inverter
2.2 Direct torque control
2.3 Proposed switching selection method
CHAPTER III. TORQUE RIPPLE REDUCTION METHOD USING FUZZY CONTROLLER
3.1 Conventional torque ripple reduction method
3.2 Proposed torque ripple reduction method using fuzzy controller
CHAPTER IV. SIMULATIONS
4.1 Proposed switching selection method
4.2 Proposed torque ripple reduction method using fuzzy controller
CHAPTER V. EXPERIMENT RESULTS
5.1 Proposed switching selection method
5.2 Proposed torque ripple reduction method using fuzzy controller
CHAPTER VI. CONCLUSION
REFERENCE
