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domingo, 15 de março de 2026
terça-feira, 10 de março de 2026
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
segunda-feira, 2 de março de 2026
Research on Control Strategy of Single-phase LCL-Type Grid-Connected Inverter based on Composite Repetitive Control -복합 반복제어에 기반한 단상 LCL-계통연계 인버터의 제어 전략에 관한 연구
Research on Control Strategy of Single-phase LCL-Type Grid-Connected Inverter based on Composite Repetitive Control
A Dissertation
Submitted to the Department of Electronic Engineering and the Graduate School of Cheongju University
in partial fulfillment of the
requirements for the degree of
Doctor of Engineering
AUTHOR:Fen Liang (양분)
ABSTRACT With the rapid development of new energy generation technologies such as photovoltaic and wind power, the distributed power generation system (DPGS) based on renewable energy has attracted more and more attention all over the world. Grid- connected inverters, as an essential component of DPGS, play an important role in converting DC into AC between photovoltaic, wind power equipment, and the power grid. However, a lot of harmonics are generated by the dead time of the grid-connected inverter, the background harmonics from the grid voltages, nonlinear loads, etc., resulting in poor control performance, high total harmonic distortion (THD), additional power loss, and even system instability. Therefore, improving the quality of current and researching high-quality current control technologies for grid-connected inverters are of great significance. Repetitive control (RC) is widely used in grid-connected inverter control systems due to its excellent harmonic suppression performance. To improve the output current quality of the grid-connected inverter and improve the robustness and control accuracy of the system, this dissertation takes a single-phase grid-connected inverter as an application target, adopts composite repetitive control technology to reduce harmonics content in the output current of the grid-connected inverter. The main works of this dissertation are as follows. (1) A single-phase LCL-type grid-connected inverter model is created, and the parameters of the LCL filter are designed. Furthermore, to eliminate the resonant peaks generated by the LCL filter, various damping strategies are compared and analyzed. (2) By analyzing the principles, stability, harmonic suppression ability of the conventional repetitive control (CRC), and advantages of proportional-integral (PI) control, the composite repetitive controller composed of RC and PI in series or in parallel structures is introduced. Furthermore, taking the proportional integral multi- resonant repetitive control (PIMR-RC) composed of RC and PI in parallel as an example, parameters design, steady-state response, and dynamic performance analysis are conducted in detail. (3) The fundamental frequency of the power grid may fluctuate at ±0.5 Hz in DPGSs, and the ratio N is the sampling frequency to the fundamental frequency of the power grid may be a fraction. However, CRC has excellent control performance only N is an integer, or it will result in a significant decrease in signal tracking and harmonic suppression performance. To ensure that the repetitive controller can accurately track reference current even when the grid frequency fluctuates and to reduce computational load and memory consumption, based on a Farrow-structure filter, a fractional-order delay PIMR-RC (FOD-PIMR-RC) scheme is proposed, which greatly improve the quality of the grid current against frequency fluctuations. Then, the stability analysis and the harmonic suppression performance of the proposed scheme are analyzed. Finally, the simulation results demonstrate the effectiveness of the proposed scheme. (4) To reduce the computational load and memory consumption, multirate repetitive control (MRC) is adopted in the PIMR-RC system for grid-connect inverters. Although MRC provides a flexible and efficient design solution, it usually adopts a downsampling rate approach. CRC with integer-order phase lead compensation cannot exactly compensate for the system phase lag, which may result in an unstable system in the case of low sampling frequency. Therefore, a fractional-order phase lead PIMR-MRC (FOPL-PIMR-MRC) scheme, employing an infinite impulse response (IIR) filter, is presented for grid-connected inverters. The proposed scheme includes the design of a fractional-order phase lead compensation filter, along with stability analysis, parameter design, and comprehensive simulation analysis. The steady-state and dynamic simulation results confirm that the proposed control scheme effectively achieves accurate phase compensation, enhances the stability margin of the system, and reduces hardware consumption. Additionally, it ensures excellent performance in harmonic suppression.
ORIGINAL LINK:
ALTERNATIVE LINK:
domingo, 1 de março de 2026
APEC 2022, Houston, TX, USA Next-Generation Datacenter MV Interfaces — Will Solid-State Transformers Meet Their Waterloo?
APEC 2022, Houston, TX, USA
Next-Generation Datacenter MV Interfaces — Will Solid-State Transformers Meet Their Waterloo?
segunda-feira, 23 de fevereiro de 2026
Inverter Control Strategies for a Grid Stabilizing Power-to-Gas System = 전력가스화 (P2G) 시스템에서 계통 안정화를 위한 인버터 제어기법 -School of Tech University of Korea
Ph.D. Dissertation Submitted to the Department of Energy and Electrical Engineering and the Graduate School of Tech University of Korea in partial fulfillment of the requirements for the Philosophy Degree in Engineering June 2024
Abstract
Inverter Control Strategies for a Grid Stabilizing Power-to-Gas System 전력가스화 (P2G) 시스템에서 계통 안정화를 위한 인버터 제어기법 The integration of Power-to-Gas (P2G) systems into modern power grids represents a pivotal advancement towards achieving a more sustainable and resilient energy infrastructure. However, this integration introduces both challenges and opportunities, particularly concerning grid stability and the effective incorporation of renewable energy sources. This thesis delves into the intricate dynamics of P2G system integration, with a specific focus on the role of inverter control strategies in ensuring grid stability and facilitating the seamless integration of renewable energy sources. Through an extensive review of existing literature and rigorous analysis, various control strategies tailored for P2G applications are explored, emphasizing their efficacy in addressing grid stability concerns. Key aspects examined include voltage and frequency regulation, active and reactive power control, ancillary services provision, and energy storage management. These factors are crucial for maintaining grid stability amidst the variability inherent in renewable energy generation and the intermittent nature of P2G systems. Additionally, the development and implementation of advanced control algorithms are discussed. These algorithms are designed to account for grid dynamics, renewable energy variability, and compliance with grid codes and regulations. A particular focus is placed on enhancing grid-forming capabilities within inverters, enabling autonomous operation even in weak grid conditions, thereby bolstering grid resilience.
ORIGINAL LINK:
ALTERNATIVE LINK:https://www.mediafire.com/file/wx16ob1ycexs50b/Inverter+Control+Strategies+for+a+Grid+Stabilizing+Power-to-Gas+System.pdf/file
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