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A Study on Optimal Vector Control of Dual Three-Phase IPMSM for EPS system with Fault Tolerance

Title
A Study on Optimal Vector Control of Dual Three-Phase IPMSM for EPS system with Fault Tolerance
Other Titles
내결함 기능을 적용한 EPS용 이중 3상 매입형 영구자석 전동기의 최적 벡터제어에 관한 연구
Author
엄현종
Alternative Author(s)
엄현종
Advisor(s)
이주
Issue Date
2020-02
Publisher
한양대학교
Degree
Master
Abstract
With advance in power electronics and battery technology, EPS(Electric Power Steering) Systems have become commonplace. At the same time, awareness of the reliability and functional safety of vehicle chassis components is changing. Thus, there is an increasing demand for a system that can operate even in faulty state. Because of this, a lot of research has been made to apply the Dual-Three Phase Machines to EPS, which satisfy the above functions. Among these technologies, Technology that maintains function using remaining set when motor system with redundant I/O fails is a common state. However, in this case, the output power of the Dual-Three Phase machines is expected to be less than half, so the disadvantage is that the function is limited in a situation when high torque is required. Therefore, in this paper proposed a Fault-Tolerant Control Method that make the most of their resources without dropping the rest of the set, even if open failure occurs. In this paper, we introduced the contents of Decoupled Vector Control for Dual-Three Phase IPMSM using dual VSI(Voltage Source Inverter) When the machine is divided into two axes, on one axis the energy conversion of the actual electromechanical system takes place. On the other axis, it implements optimized vector control that controls the electromagnetic effects of the machine. And it suggested measure to deal with one-phase-fault in on set of VSI during operation. In addition, it proposed a method that can be applied to vector control by substituting this into coordinate transformation and voltage modulation method to cope with phase fault. Through using simulation, it verified the effectiveness of the optimal vector control which eliminates the adverse effect of the failure and improves the reliability.|전력전자기술과 배터리 기술의 발전으로 차량 조향부품인 EPS(전자식 파워 스티어링)시스템이 보편화 되었다. 이와 동시에 차량 샤시부품의 신뢰성과 기능안전성에 관한 인식이 변화하고 있음에 따라 고장 상황에서도 구동이 가능한 시스템에 대한 요구가 많아지고 있다. 이로 인해 이러한 기능을 만족하는 전동기인 이중 3상 전동기와 이를 EPS에 적용하기 위한 기술이 개발되고 있다. 이러한 기술 중에 이중화된 입출력을 가진 전동기 시스템에서 결함 발생시 한 쪽 세트를 탈락시키고 남은 세트를 이용하여 기능을 유지하는 기술이 개발 되었다. 하지만 이 경우에는 이중 3상 전동기의 특성상 절반 이하의 출력을 낼 수 있기 때문에 높은 토크가 요구되는 상황에서는 기능이 제한적이라는 것이 단점이다. 이를 보완하기 위해 한 상의 개방 고장이 발생하더라도 최대한 자원을 활용하여 출력을 이끌어내는 내결함 제어법에 대해서 제안하였다. 본 논문에서는 두 개의 VSI를 이용하는 이중 3상 IPMSM의 비결합 D-Q 모델의 벡터제어에 관한 전반적인 내용을 소개하였다. 전동기를 두 개의 축으로 나누어 한 축에서는 실제 전기-기계 시스템의 에너지변환이 이루어지며, 다른 축에서는 전동기 내부의 전자기적 영향을 제어하는 최적화된 벡터제어를 구현하였다. 여기에 전동기 구동 중에 한 세트의 VSI에서 한 상에 개방 고장이 발생할 경우 Fault-Tolerant 제어 방법에 대해서 제안하였으며, 추가적으로 그리고 이를 좌표변환에 대입하여 벡터제어에서 적용하는 방법과 상 고장에 대처할 수 있는 전압변조 방식에 관하여 제안하였다. 그리고 MATLAB/Simulink를 이용한 시뮬레이션을 통해 이중 3상 IPMSM에서 발생하는 상 고장에 의한 악영향을 제거하고 신뢰성 향상의 유효성을 검증하였다.; With advance in power electronics and battery technology, EPS(Electric Power Steering) Systems have become commonplace. At the same time, awareness of the reliability and functional safety of vehicle chassis components is changing. Thus, there is an increasing demand for a system that can operate even in faulty state. Because of this, a lot of research has been made to apply the Dual-Three Phase Machines to EPS, which satisfy the above functions. Among these technologies, Technology that maintains function using remaining set when motor system with redundant I/O fails is a common state. However, in this case, the output power of the Dual-Three Phase machines is expected to be less than half, so the disadvantage is that the function is limited in a situation when high torque is required. Therefore, in this paper proposed a Fault-Tolerant Control Method that make the most of their resources without dropping the rest of the set, even if open failure occurs. In this paper, we introduced the contents of Decoupled Vector Control for Dual-Three Phase IPMSM using dual VSI(Voltage Source Inverter) When the machine is divided into two axes, on one axis the energy conversion of the actual electromechanical system takes place. On the other axis, it implements optimized vector control that controls the electromagnetic effects of the machine. And it suggested measure to deal with one-phase-fault in on set of VSI during operation. In addition, it proposed a method that can be applied to vector control by substituting this into coordinate transformation and voltage modulation method to cope with phase fault. Through using simulation, it verified the effectiveness of the optimal vector control which eliminates the adverse effect of the failure and improves the reliability.
URI
https://repository.hanyang.ac.kr/handle/20.500.11754/123691http://hanyang.dcollection.net/common/orgView/200000436719
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > ELECTRICAL ENGINEERING(전기공학과) > Theses (Master)
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