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Control of High-Power-Density Line-Interfaced Power Converters
Control of High-Power-Density Line-Interfaced Power Converters
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151143
- ISBN
- 9798382841366
- DDC
- 621.3
- 저자명
- Farooq, Maida.
- 서명/저자
- Control of High-Power-Density Line-Interfaced Power Converters
- 발행사항
- [Sl] : Cornell University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 145 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
- 주기사항
- Advisor: Afridi, Khurram.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2024.
- 초록/해제
- 요약Line-interfaced power converters are crucial in modern electronics, facilitating efficient energy conversion and seamless integration of renewable energy sources, storage systems, and grid-connected loads. Yet, ensuring their stable and reliable operation presents significant control challenges, especially with increasing demands for high performance. This thesis introduces control and design methodologies to improve performance of line-interfaced power converters. The power converters covered in this thesis are ac-dc converters for LED driver and data center applications and ac-dc-ac converters for data center applications.The thesis addresses challenges in designing the input current control loop for the PFC stage of an LED driver, focusing on achieving high power density with a small inductance. A systematic design methodology is proposed for the input current control loop, evaluating three compensator types for optimal input current shaping. Additionally, a feedforward in conjunction with feedback controller is introduced to mitigate input voltage variations, ensuring well-regulated LED current. Experimental validation is conducted on a prototype 150-W, 50-W/in3 offline LED driver, demonstrating the effectiveness of the proposed control strategies.Following this, the control of high-power paralleled ac-dc converter modules is introduced. A new droop control strategy ensures equal output current distribution between paralleled modules when powering a common load. An analytical model facilitates the design of the input-current-based droop control. Experimentation with two 1-kW universal-input to 28-V isolated ac-dc converter modules validates the proposed droop control design.Next, a high-power-density ac-dc-ac converter tailored for online UPS applications is introduced. The thesis focusses on overcoming primary control challenges, especially regarding the dual-mode functionality of the dc-ac inversion stage. The control challenges arising from mismatched dynamics in the dual-mode inversion stage are identified and adaptive feedback, dynamic cancellation, and feedforward-enhanced feedback control strategies to achieve low output voltage THD without increasing control complexity are proposed. Analytical assessments and detailed design guidelines for these control strategies are provided. Experimental validation using a 1-kW prototype online UPS demonstrates significant reduction in output voltage THD compared to standard feedback control, with output voltage THD as low as 2.9% across a wide operating range.Finally, to achieve higher power densities and a low-profile form factor (1U), a comprehensive control and design methodology is presented. A methodology is developed to optimize the converter design by considering trade-offs between overall efficiencies and power densities. A novel control strategy based on mixed duty-ratio and frequency modulation is proposed to ensure soft-switching of all inverter transistors and well-regulated output voltage. A 1-kVA prototype online UPS, utilizing GaN transistors and operating at switching frequencies up to 2 MHz, achieves a power density of 60.4 W/in3 and maintains a low-profile form factor (1U ≝1.75 inch height).
- 일반주제명
- Electrical engineering
- 일반주제명
- Applied physics
- 키워드
- Renewable energy
- 키워드
- Ac-dc converter
- 키워드
- Storage systems
- 기타저자
- Cornell University Electrical and Computer Engineering
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151143
■006m o d
■007cr#unu||||||||
■020 ▼a9798382841366
■035 ▼a(MiAaPQ)AAI31234611
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a621.3
■1001 ▼aFarooq, Maida.▼0(orcid)0000-0001-8982-9912
■24510▼aControl of High-Power-Density Line-Interfaced Power Converters
■260 ▼a[Sl]▼bCornell University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a145 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-12, Section: B.
■500 ▼aAdvisor: Afridi, Khurram.
■5021 ▼aThesis (Ph.D.)--Cornell University, 2024.
■520 ▼aLine-interfaced power converters are crucial in modern electronics, facilitating efficient energy conversion and seamless integration of renewable energy sources, storage systems, and grid-connected loads. Yet, ensuring their stable and reliable operation presents significant control challenges, especially with increasing demands for high performance. This thesis introduces control and design methodologies to improve performance of line-interfaced power converters. The power converters covered in this thesis are ac-dc converters for LED driver and data center applications and ac-dc-ac converters for data center applications.The thesis addresses challenges in designing the input current control loop for the PFC stage of an LED driver, focusing on achieving high power density with a small inductance. A systematic design methodology is proposed for the input current control loop, evaluating three compensator types for optimal input current shaping. Additionally, a feedforward in conjunction with feedback controller is introduced to mitigate input voltage variations, ensuring well-regulated LED current. Experimental validation is conducted on a prototype 150-W, 50-W/in3 offline LED driver, demonstrating the effectiveness of the proposed control strategies.Following this, the control of high-power paralleled ac-dc converter modules is introduced. A new droop control strategy ensures equal output current distribution between paralleled modules when powering a common load. An analytical model facilitates the design of the input-current-based droop control. Experimentation with two 1-kW universal-input to 28-V isolated ac-dc converter modules validates the proposed droop control design.Next, a high-power-density ac-dc-ac converter tailored for online UPS applications is introduced. The thesis focusses on overcoming primary control challenges, especially regarding the dual-mode functionality of the dc-ac inversion stage. The control challenges arising from mismatched dynamics in the dual-mode inversion stage are identified and adaptive feedback, dynamic cancellation, and feedforward-enhanced feedback control strategies to achieve low output voltage THD without increasing control complexity are proposed. Analytical assessments and detailed design guidelines for these control strategies are provided. Experimental validation using a 1-kW prototype online UPS demonstrates significant reduction in output voltage THD compared to standard feedback control, with output voltage THD as low as 2.9% across a wide operating range.Finally, to achieve higher power densities and a low-profile form factor (1U), a comprehensive control and design methodology is presented. A methodology is developed to optimize the converter design by considering trade-offs between overall efficiencies and power densities. A novel control strategy based on mixed duty-ratio and frequency modulation is proposed to ensure soft-switching of all inverter transistors and well-regulated output voltage. A 1-kVA prototype online UPS, utilizing GaN transistors and operating at switching frequencies up to 2 MHz, achieves a power density of 60.4 W/in3 and maintains a low-profile form factor (1U ≝1.75 inch height).
■590 ▼aSchool code: 0058.
■650 4▼aElectrical engineering
■650 4▼aApplied physics
■653 ▼aRenewable energy
■653 ▼aAc-dc converter
■653 ▼aFrequency modulation
■653 ▼aStorage systems
■690 ▼a0544
■690 ▼a0215
■71020▼aCornell University▼bElectrical and Computer Engineering.
■7730 ▼tDissertations Abstracts International▼g85-12B.
■790 ▼a0058
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160970▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
