MILP(Mixed Integer Linear Programming)-Based Optimal Strategy for Real-time Operation of Multi-Objective Battery Energy Storage System Integrated with Wind Generator BY Choi, Won Bin (Supervisor Song, Hwa Chang) Dept. of Electrical and Information Engineering Graduate School Seoul National University of Science and Technology

MILP(Mixed Integer Linear Programming)-Based Optimal Strategy for Real-time Operation of Multi-Objective Battery Energy Storage System Integrated with Wind Generator

 by Choi, Won Bin (Supervisor Song, Hwa Chang) 

Dept. of Electrical and Information Engineering

 Graduate School Seoul National University of Science and Technology 

풍력발전 연계 다목적 BESS의 실시간 운영을 위한 혼합정수선형계획법 기반 최적 충방전 전략

 Abstract Large thermal plants-based conventional power system has been changing the system structure to the distributed and decentralized one in which a various number of REs and ESSs are installed regionally. The change leads to new market policies and emergence of prosumer. There can be several considerations to operate the Wind-BESS hybrid system. For the prosumer’s perspective, maximizing operational profit can be one of the most prioritized goals. Another important thing to be considered is to control the output not to lead to severe frequency fluctuation in case of incident wind speed deviation. In this paper, two operation algorithms based on mixed integer linear programming are proposed. First scheme is the wind ramp-rate constrained economic operation. According to domestic RPS policy, the EMS provides the most profitable 1 day scheduling that does not exceed the limitation assigned by local grid code. Secondly, Peak shaving algorithm dispatching multiple BESSs is proposed. BESS resources will be able to lighten the system’s burden when certain local grids experience peak load. So the algorithm will dispatch applied batteries considering each performance, efficiencies and its physical limit. The output throughout this study could be references of BESS operation and controller. Also, the designing EMS with proposed algorithms are expected to maximize the advantages for both prosumer and grid operator.

ORIGINAL SOURCE: https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=3414f3b6158e2649ffe0bdc3ef48d419&keyword=BESS

Translated from Korean to English.:https://www.mediafire.com/file/04s5dd776vp76o9/MILPMixed+Integer+Linear+Programming-Based+Optimal.en.dual.pdf/file

NOTE: Thesis translated from Korean to English using artificial intelligence. As you know, the translation isn't perfect, but it helps a lot. However, it struggles with mathematical formulas, which is why I'm publishing the original and translated files side-by-side so you can read them successfully.

PROJETO PIONERO DE SHORE POWER NO BRASIL-ESTUDO DO CASO DO PORTO DE PECEM -CEARA-BRASIL-PALESTRANTE ENG. GUSTAVO CASTELO BRANCO ( CEO GRID POWER SOLUTION)-INTERSOLAR SAO PAULO

 

ASSISTA O VIDEO COMPLETO MINISTADO PELO ENG. GUSTAVO BRANCO  (GPS)

재사용 배터리 ESS 안전 운용 및 성능 검증 시뮬레이션 환경 개발 = Development of Simulation Environment for Safe Operation and Performance Validation of Reused Battery ESS

 

Development of Simulation Environment for Safe Operation and Performance Validation of Reused Battery ESS Park Joonhong Department of Electrical Engineering, Graduate School of Chonnam National University (Supervised by Professor Ahn Seon-ju)

 (Abstract) With the expansion of the used battery market expected around 2030, the promotion of reuse and recycling industries for used batteries has emerged as a critical issue. Battery reuse technology refers to the process of evaluating the remaining capacity and lifespan of secondary batteries, whose full-charge capacity has fallen below a certain threshold after use in electric vehicles (EVs), and repurposing them for other applications such as ESS (Energy Storage Systems) and UPS (Uninterruptible Power Supplies). This technology holds significant value in terms of economic efficiency and resource circulation. Particularly, numerous demonstration studies are being conducted to optimize safe operation and establish system standardization for ESS using reused batteries. This study aims to ensure the safe operation of ESS composed of reused batteries by designing three algorithms necessary for estimating battery status and evaluating health, based on existing research and literature, and examining their application conditions. These algorithms are presented in the form of SOX (State of X, where X = Power, Health, Balance, etc.), and based on this, an operational program menu structure was designed. Additionally, a simulation model was developed to validate the performance of reused battery ESS, identifying key considerations for model design, including capacity deviation, internal parameter variation, degradation rate differences, and thermal factors. Simulated operations were used to verify parts of the algorithms and observe changes in ESS conditions. This study differentiates itself from existing research in two main aspects. First, it involves the actual application of operational data-based battery status estimation algorithms to ESS. Unlike previous studies that primarily focused on laboratory environments or small-scale cell-based tests, this study incorporated factors necessary for applying these algorithms to a 500kWh large-scale ESS composed of reused batteries. Second, it identifies and integrates key considerations for simulation model design to validate the performance of reused battery ESS. Specifically, four essential elements that must be included in the design of reused battery ESS models were defined and applied to the simulation model, providing guidance for future ESS model design utilizing reused batteries. In this study, a safe operation plan for reused battery ESS was developed, and a simulation model for performance validation was created. Furthermore, through simulated operations under various conditions, the study analyzed ESS conditions and confirmed the effectiveness of the algorithms. The results are expected to serve as foundational data for evaluating the safety and performance of ESS in the future.

FULL THESIS

 :https://www.mediafire.com/file/1yd28ry2jnfe3ya/000000075764_20260826213443.en.dual.pdf/file

3상 인버터를 위한 방열판 크기 최적화 -Heat Sink Size Optimization for 3-Phase Inverter-Gwangwoon University Graduate School Department of Electrical Engineering-AUTHOR Seo Yujin

 

3상 인버터를 위한 방열판 크기 최적화 -Heat Sink Size Optimization for 3-Phase Inverter-Gwangwoon University Graduate School Department of Electrical Engineering-AUTHOR Seo Yujin This thesis is submitted as an Engineering Master's Thesis 다국어 초록 (Multilingual 

Abstract) kakao i 다국어 번역 The power loss of the inverter acts as heat. Therefore, heat dissipation design is essential for high-output inverter operation. In this paper, a heat sink size optimization method applicable to all inverter module and heat sink structures is proposed. The capacity of the inverter was selected according to the load conditions, and the input power, output power, switching loss, conduction loss, case temperature, and junction maximum temperature were measured through simulation. Through this, the case temperature and junction temperature according to the loss of the inverter are found, and the appropriate heat sink size is suggested through heat dissipation simulation. The smaller the size of the heat sink, the higher the heat dissipation efficiency at the same power loss. However, if the temperature of the junction of the inverter becomes too high, operation is impossible. Therefore, we find out through simulation how high the operating temperature of the inverter can be with the minimum heat sink size. Create a 3D model of the inverter module and heat sink, apply the loss power derived through inverter simulation, and check the output temperature through simulation while reducing the size of the heat sink. Through this, a method for selecting the minimum size of the heat sink applicable to the inverter module was proposed. 

ORIGINAL LINK KOREAN:

 https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=de6fb1f6978f0912ffe0bdc3ef48d419&keyword=3%EC%83%81%20%EC%9D%B8%EB%B2%84%ED%84%B0 

Thesis translation from Korean and English:https://www.mediafire.com/file/eybq0nvdhtnik4w/Heat+Sink+Size+Optimization+for+3-Phase+Inverter.pdf/file

 

Effects of Flat-Core Geometry on Magnetic Flux Distribution and Thermal Behavior in Integrated Transformers for High-Frequency LLC Converters- Journal of Electrical Engineering & Technology-BY-Jun-Taek Oh · Taek-Keun Jung · Jong-Soo Kim

 

Effects of Flat-Core Geometry on Magnetic Flux Distribution and Thermal Behavior in Integrated Transformers for High-Frequency LLC Converters Jun-Taek Oh1 · Taek-Keun Jung1 · Jong-Soo Kim1 Received: 18 November 2025 / Revised: 12 April 2026 / Accepted: 27 April 2026 / Published online: 22 May 2026

 © The Author(s) under exclusive licence to The Korean Institute of Electrical Engineers 2026

 Abstract This study investigates the thermal behavior of an integrated transformer structure that incorporates a flat core to expand the flux-sharing area. Using electromagnetic analysis based on Ansys Maxwell, the characteristics of magnetic flux distribution and core temperature rise are analyzed, and the magnetic flux density and thermal behavior are compared according to the presence of the resonant inductor core and variations in flat-core thickness. In addition, the characteristics of flux overlap and saturation according to the direction of flux flow are analyzed. Based on these analyses, an optimized integrated transformer design is proposed to effectively mitigate heat generation and magnetic flux saturation. To verify the feasibility of this design, a 500-kHz LLC resonant converter prototype was built, and experiments were conducted at approximately 3.1 kW in the resonant frequency region. The results show that the optimized design reduces core temperature rise by up to 95.8 °C compared with a conventional design that does not consider flat-core thickness and integrated transformer geometry, while also improving overall system efficiency by 0.7%. These findings demonstrate the effectiveness of the flat-core-based integrated transformer design in high-frequency, high-power-density power conversion systems and highlight its potential applicability to future highly integrated power electronic systems.

VIEW ORIGINAL  FULL ARTICLE : https://link.springer.com/article/10.1007/s42835-026-02795-9

ALTERNATIVE LINK :https://www.mediafire.com/file/u2r54j2fkjxipqb/s42835-026-02795-9.pdf/file