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A Hybrid Control Method of MMC-Based PV and BESS Under Uneven Irradiance

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Alternative Title
부분 음영 하에서 MMC 기반의 태양광 발전 및 BESS를 위한 하이브리드 제어 방법
Abstract
In the trend of renewable energy, Photovoltaic (PV) energy with PV plants are invested rapidly. Due to the natural fluctuation of irradiation, getting the Maximum Power Point Tracking (MPPT) algorithm and balancing power output are achieving points. This thesis proposed the modified topology of a hybrid Modular Multilevel Converter (MMC) – based PV- Battery Energy Storage System (BESS). By using the individual SM capacitor voltage, PV arrays could be adopted at Maximum Power Point (MPP) voltage without DC/DC converters when interfacing with Sub-Modules (SMs). BESSs are the solution applied in this proposed topology to eliminate power mismatching under partial shading conditions. To guarantee the applicability of the system, PSCAD/EMTDC software is used to make the simulations according to uneven illumination conditions. By adopting the method, the power mismatching is reduced by BESSs’ power exchanging with Total Harmonic Distortion (THD) under 5%.|재생 에너지의 트렌드에 따라 PV 발전소와 함께 PV 에너지에 대한 투자가 급속히 이뤄지고 있다. 일사량의 자연적인 변동으로 인해 최대 전력점 추종(MPPT) 알고리즘과 출력 밸런싱은 중요한 요소이다. 본 논문에서는 하이브리드 모듈형 다단계 변환기(MMC) 기반의 PV-배터리 에너지 저장 시스템(BESS)의 수정된 토폴로지와 제어법을 제안한다. 제안한 방식은 BESS를 활용하여 부분 음영 조건에서 전력 불일치를 제거하기 때문에, 개별 서브모듈(SM)은 DC/DC 컨버터 없이 PV 어레이를 최대 전력점(MPP) 전압에서 운전할 수 있다. 시스템의 유효성을 검증하기 위해, PSCAD/EMTDC 소프트웨어를 사용하여 불균일한 일사량 발생 시의 조건에서 시뮬레이션을 수행하였다. 검증결과 제안한 방식의 총 고조파 왜율(THD)이 5% 미만을 달성하고, 기존 방식에 비하여 부분음영에 강인하여 레그 간 전력 불균형이 감소함을 확인하였다.
Author(s)
짠 타이 응웬
Issued Date
2023
Awarded Date
2023-08
Type
Dissertation
URI
https://dcoll.jejunu.ac.kr/common/orgView/000000011446
Alternative Author(s)
Tran Thai Nguyen
Affiliation
Graduate School Jeju National University
Department
대학원 에너지응용시스템학부
Advisor
Choi Yeong-Jun
Table Of Contents
Chapter 1. Introduction 1
1.1. Motivation of the thesis 1
1.2. Knowledge background 2
1.3. Purpose of the thesis 7
1.4. Thesis layout 8
Chapter 2. Hybrid MMC Based PV And BESS 9
2.1. Structure of hybrid MMC Based PV and BESS 9
2.2. Mathematical model of the hybrid system 10
2.3. Sub-module operation states 12
2.4. Design of the system 15
2.4.1. Design of the arm inductor. 15
2.4.2. Design of the submodule capacitor 16
2.4.3. Design of BESS 17
Chapter 3. Control of the hybrid MMC based PV and BESS 22
3.1. Grid-connected control 22
3.2. PV SM capacitor voltage balancing 23
3.2.1. PV SMs leg average voltage control 24
3.2.2. Individual voltage control 25
3.3. BESS control scheme 27
3.3.1. Smooth power control 27
3.3.2. Power mismatching elimination 28
Chapter 4. Simulation Results 30
4.1. The power smoothly 31
4.2. Arm power mismatching elimination 35
Chapter 5. Conclusion 39
References 41
Degree
Master
Publisher
Graduate School Jeju National University
Citation
짠 타이 응웬. (2023). A Hybrid Control Method of MMC-Based PV and BESS Under Uneven Irradiance.
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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  • Embargo2023-08-14
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