모델예측기반의 직접전력제어를 사용하는 AC/DC 및 DC/DC 컨버터의 동적응답특성 개선
Dynamic Improvement of AC/DC and DC/DC Converters Using Model Predictive Control Based Direct Power Control
- 발행기관 아주대학교
- 지도교수 이교범
- 발행년도 2015
- 학위수여년월 2015. 2
- 학위명 박사
- 학과 및 전공 일반대학원 전자공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000018868
- 본문언어 한국어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
This paper proposes techniques for performance improvement and analyzes problems generated when model predictive direct power control (MPDPC) is applied to AC/DC/DC converter. Firstly, this paper presents a control scheme for the dynamic performance improvement of an AC/DC converter using the model predictive direct power control with duty cycle. In the MPDPC, the active and reactive powers are simultaneously controlled with a single cost function. If either of the two control targets has a large power variation, the control weight is concentrated on one side which causes the mutual interference. Because of such mutual interference, the control dynamics of the AC/DC converter deteriorates. Due to the control weight being concentrated on one side using the single cost function, the dynamic performance of the system is improved by reconfiguring the cost function that has the weighting factor to minimize the decline of the system dynamics which is caused by the mutual interference, even if the control dynamics of the other side decreases. The effectiveness of the proposed control scheme is verified by comparing its results with those of the conventional MPDPC. Secondly, it presents a model predictive direct power control for interleaved multiphase DC/DC converters. The power values necessary to adjust the output voltage in the succeeding are predicted using a converter model. The output power is controlled by selecting the optimal duty cycle. The proposed method does not require controller loopsand modulators for converter switching. This method can control the converter by calculating the optimal duty cycle, which minimizes the error between the reference and actual output voltage. The effectiveness of the proposed method is verified through simulations and experiments.
more목차
제 1 장 서론 ...................................................................................................................................... 1
1.1 연구의 배경 ......................................................................................................................... 1
1.2 연구의 목적 ......................................................................................................................... 4
1.3 논문의 구성 ......................................................................................................................... 5
제 2 장 모델예측기반의 직접전력제어(MPDPC) ............................................................... 7
2.1 직접전력제어 ....................................................................................................................... 7
2.2 모델예측제어 ..................................................................................................................... 12
2.2.1 동작원리 .................................................................................................................. 12
2.2.2 제어기 설계 ........................................................................................................... 15
2.2.3 시스템 적용 ........................................................................................................... 16
제 3 장 MPDPC 를 적용한 AC/DC 컨버터의 동적응답특성 향상기법 ................ 24
3.1 AC/DC 컨버터의 예측모델 ......................................................................................... 24
3.2 동적응답특성 향상을 위한 MPDPC 기법 ............................................................ 28
3.2.1 재구성된 비용함수를 이용한 최적전압 벡터 선정 ............................. 29
3.2.2 유효전압 벡터를 위한 듀티비 계산 ........................................................... 40
3.3 시뮬레이션 ......................................................................................................................... 43
3.4 실험.......................................................................................................................................52
제 4 장 MPDPC 를 적용한 DC/DC 컨버터의 출력전압 제어기법 .......................... 59
4.1 DC/DC 컨버터의 구조 .................................................................................................. 59
4.2 DC/DC 컨버터의 예측모델 ......................................................................................... 62
4.3 DC/DC 컨버터를 위한 MPDPC 기법 ...................................................................... 63
4.4 시뮬레이션 ......................................................................................................................... 66
4.5 실험.......................................................................................................................................74
제 5 장 결론 및 요약 .................................................................................................................. 79
제 6 장 참고문헌 ........................................................................................................................... 81
