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전압 밸런싱 기능을 갖는 바이폴라 타입 DC-DC 컨버터

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Alternative Title
Bipolar type DC-DC converter with voltage balancing function
Abstract
DC microgrid has no reactance components, so it does not generate reactive power, is easy to connect to the grid, and can maximize efficiency through fewer power conversion steps. The configuration of DC microgrid is classified into unipolar, bipolar, and multipolar. Bipolar consists of three lines and is classified into positive, neutral, and negative voltages, allowing three different voltage levels to be utilized. This structure can lower the rated voltage of semiconductor devices and prevent the spread of accidents by not affecting the other pole even if an accident occurs on one pole. However, compared to unipolar, the transmission capacity is low and there is a risk that power quality may be impaired due to voltage imbalance. As a way to resolve voltage imbalance, a power conversion device called a voltage balancer is connected to the DC side of the converter on the system side. However, the voltage balancer has the limitation that when the load is concentrated on one voltage pole, a large voltage difference occurs, which may cause the device to fail, and only serves to reduce voltage imbalance. Thus, this paper proposes a bipolar type DC-DC converter with voltage balancing function. The proposed converter can simultaneously perform bidirectional power transmission and voltage balancing without a separate voltage balancer circuit, so it can be applied to emergency power generation sources such as energy storage systems. To verify the proposed converter, the operating principle is analyzed under voltage imbalance conditions and the controller is designed using a mathematical model. Afterwards, it was confirmed that the designed controller operates stably through simulation analysis and experiments.
Author(s)
진창완
Issued Date
2024
Awarded Date
2024-02
Type
Dissertation
URI
https://dcoll.jejunu.ac.kr/common/orgView/000000011760
Alternative Author(s)
Jin Chang wan
Affiliation
제주대학교 대학원
Department
대학원 에너지응용시스템학부
Advisor
최영준
Table Of Contents
Ⅰ. 서 론 1
1.1 연구 배경 1
1.2 연구 목적 3
1.3 논문의 구성 4
Ⅱ. DC 마이크로그리드와 전압 밸런서 5
2.1 DC 마이크로그리드와 AC 마이크로그리드의 비교 5
2.2 DC 마이크로그리드의 구성 7
2.2.1 유니폴라 타입 DC 마이크로그리드 7
2.2.2 바이폴라 타입 DC 마이크로그리드 8
2.2.3 멀티폴라 타입 DC 마이크로그리드 9
2.3 전압 밸런서의 구성 11
2.3.1 비절연형 전압 밸런서 12
2.3.2 절연형 전압 밸런서 15
Ⅲ. 제안하는 컨버터의 구성 및 제어 방법 17
3.1 컨버터 구성 및 동작 원리 17
3.1.1 전압 밸런싱이 가능한 DC-DC 컨버터 17
3.1.2 컨버터 동작 원리 18
3.2 시스템 모델링 27
3.2.1 컨버터 상태공간 평균 모델링 및 소신호 해석 27
3.2.2 메인 컨버터 방전 모드 28
3.2.3 메인 컨버터 충전 모드 30
3.2.4 서브 컨버터 승압 모드 32
3.2.5 서브 컨버터 강압 모드 34
3.3 제어기 설계 방법 36
3.4 컨버터의 특성 분석 44
3.4.1 안정도 분석 44
3.4.2 기존 대비 특성 47
Ⅳ. 시뮬레이션 모의해석 및 실험 결과 48
4.1 시뮬레이션 모의해석 48
4.2 실험 세트 구성 및 실험 결과 51
4.3 결과 고찰 58
Ⅴ. 결론 59
참고문헌 60
Degree
Master
Publisher
제주대학교 대학원
Citation
진창완. (2024). 전압 밸런싱 기능을 갖는 바이폴라 타입 DC-DC 컨버터.
Appears in Collections:
Faculty of Applied Energy System > Electronic Engineering
Faculty of Applied Energy System > Energy and Chemical Engineering
Faculty of Applied Energy System > Mechanical Enginering
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  • Embargo2024-02-12
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