계통 연계 직류 지역망을 위한 양방향 인터링킹 AC/DC 컨버터의 분산형 DC 전압 기반 그리드 포밍 제어기 설계 및 분석 = Design and Analysis of Distributed DC Voltage based Grid Forming Controller for Bidirectional Interlinking AC/DC Converter in Grid-connected DC Local Grid

계통 연계 직류 지역망을 위한 양방향 인터링킹 AC/DC 컨버터의 분산형 DC 전압 기반 그리드 포밍 제어기 설계 및 분석 = Design and Analysis of Distributed DC Voltage based Grid Forming Controller for Bidirectional Interlinking AC/DC Converter in Grid-connected DC Local Grid

Advisor: Professor Raeyoung Kim This thesis is submitted for the Master's degree in Engineering. Hanyang University Graduate School Department of Electrical Engineering 

AUTHOR:Jinwoo Jeong

ABSTRACT This paper proposes and analyzes a distributed DC-voltage-based grid-forming control method for a bidirectional interlinking AC/DC converter to address operational challenges in grid-connected DC Local Grids under weak grid conditions. The proposed method adjusts the DC voltage reference based on AC active power output to perform DC Voltage Droop control while integrating a synchronization controller designed through small-signal modeling to enhance stability. To mitigate Synchronous Oscillation (SO) issues caused by the coupling of DC Voltage Droop and grid-forming control, a Notch Filter was introduced. The proposed method was validated through PLECS and PSCAD simulations, demonstrating stable voltage control and power sharing under both strong (SCR=5) and weak (SCR=2) grid conditions. Compared to conventional Grid-Following control, the proposed approach offers improved stability in weak grids while ensuring proper power sharing, enhancing the reliability and flexibility of DC Local Grids. 

ORIGINAL LINK: https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=8d3b7774163776b8ffe0bdc3ef48d419 

ALTERNATIVE LINK: https://www.mediafire.com/file/hnotk10a8h2fofy/Design+and+Analysis+of+Distributed+DC+Voltage+based+Grid+Forming+Controller+for+Bidirectional+Interlinking+ACDC+Converter+in+Grid-connected+DC+Local+Grid.pdf/file