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Power-Management Strategies for a Grid-Connected PV-FC Hybrid System
Loc Nguyen Khanh,Jae-Jin Seo,Yun-Seong Kim,Dong-Jun Won IEEE 2010 IEEE transactions on power delivery Vol.25 No.3
<P>This paper presents a method to operate a grid connected hybrid system. The hybrid system composed of a Photovoltaic (PV) array and a Proton exchange membrane fuel cell (PEMFC) is considered. The PV array normally uses a maximum power point tracking (MPPT) technique to continuously deliver the highest power to the load when variations in irradiation and temperature occur, which make it become an uncontrollable source. In coordination with PEMFC, the hybrid system output power becomes controllable. Two operation modes, the unit-power control (UPC) mode and the feeder-flow control (FFC) mode, can be applied to the hybrid system. The coordination of two control modes, the coordination of the PV array and the PEMFC in the hybrid system, and the determination of reference parameters are presented. The proposed operating strategy with a flexible operation mode change always operates the PV array at maximum output power and the PEMFC in its high efficiency performance band, thus improving the performance of system operation, enhancing system stability, and decreasing the number of operating mode changes.</P>
Power Sharing Method for a Grid connected Microgrid with Multiple Distributed Generators
Khanh-Loc Nguyen,Dong-Jun Won,Seon-Ju Ahn,Il-Yop Chung 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.4
In this paper, a grid connected microgrid with multiple inverter-based distributed generators (DGs) is considered. DG in FFC mode regulates the microgrid as a controllable load from the utility point of view as long as its output is within the capacity limit. The transition mode causes a change in frequency of microgrid due to the loss of power transferred between main grid and microgrid. Frequency deviation from the nominal value can exceed the limit if the loss of power is large enough. This paper presents a coordinated control method for inverter-based DGs so that the microgrid is always regulated as a constant load from the utility viewpoint during grid connected mode, and the frequency deviation in the transition mode is minimized. DGs can share the load by changing their control modes between UPC and FFC and stabilize microgrid during transition.
Power Sharing Method for a Grid connected Microgrid with Multiple Distributed Generators
Nguyen, Khanh-Loc,Won, Dong-Jun,Ahn, Seon-Ju,Chung, Il-Yop The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.4
In this paper, a grid connected microgrid with multiple inverter-based distributed generators (DGs) is considered. DG in FFC mode regulates the microgrid as a controllable load from the utility point of view as long as its output is within the capacity limit. The transition mode causes a change in frequency of microgrid due to the loss of power transferred between main grid and microgrid. Frequency deviation from the nominal value can exceed the limit if the loss of power is large enough. This paper presents a coordinated control method for inverter-based DGs so that the microgrid is always regulated as a constant load from the utility viewpoint during grid connected mode, and the frequency deviation in the transition mode is minimized. DGs can share the load by changing their control modes between UPC and FFC and stabilize microgrid during transition.
Loc My Thi Nguyen,Tien-Trung Nguyen,Thanh Thi Nghiem,Hien Thu Thi Le,Thao Phuong Thi Trinh,Thuan Van Pham,Thanh Chi Nguyen,Linh Khanh Hoang,Trung Tran 한국과학학술지편집인협의회 2020 Science Editing Vol.7 No.1
In the context of the need to ensure appropriate signalling of the publication of high-quality, international-calibre publications in Vietnam, as well as new policies to improve the quality and effectiveness of scientific research in Vietnam, it is practical to investigate the possibility of developing a national open access database (NOAD). This study aims to answer the question of whether it is necessary to establish a NOAD in Vietnam. We used document analysis to evaluate issues related to NOADs. The results of this study show the complexity, lack of consistency, and difficulty in obtaining practical statistics and assessing research and scientific records in Vietnam today. Furthermore, the findings of this study imply that it is necessary to establish a NOAD of scientific research in Vietnam. The information in this report can be used to develop a NOAD for Vietnam in particular, and for any country that lacks one in general.
Hoang Dang Khoa(황등과),Nguyen Khanh Loc(응웬칸록),Dong Jun Won(원동준) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
As wind power plants continue their ever increasing penetration in the power system, it is matter of time when the wind power production will be comparable to or even larger than the conventional power generation. Currently, several large scale offshore wind farm projects have been undergone in many places in the world. Up to now, the AC transmission system has been well accepted for the integration of all offshore wind farms to the Grid; there has been as yet no Voltage Source Converter (VSC) based-transmission system applied for offshore wind farms. In this paper, relevant aspects relating to the large-scale development of offshore wind power will be discussed. An overview of the transmission solutions to associate offshore wind farms to the Grid will be also surveyed. An offshore wind farm connected to the VSC-High Voltage Direct Current (VSC-HVDC) transmission system will be proposed. Operation modes of the proposed system with a specific control strategy will be modeled; faults in each system will be examined separately along with results exposed. All simulations in this paper will be carried out in PSCAD/EMTDC environment.
Battery와 Electrolyzer를 이용한 태양광 발전시스템 운영
康起赫(Gi-Hyeok Gang),金閏成(Yun-Seong Kim),응웬칸록(Nguyen Khanh Loc),元東俊(Dong-Jun Won) 대한전기학회 2008 전기학회논문지 Vol.57 No.11
The output power of photovoltaic(PV) generation system is strongly affected by weather conditions. To make up for the defect of solar energy, energy storages such as battery and electrolyzer are usually integrated with photovoltaic cell. This paper focuses on the way to store energy surplus with battery and electrolyzer and to provide energy with battery. Photovoltaic generation system is modeled with PV cell, DC/DC converter, DC/AC inverter, battery and electrolyzer. The operation algorithm to regulate PV output power with battery and electrolyzer is suggested. The simulation results show that battery and electrolyzer effectively cooperate with each other to compensate the fluctuation of PV generation system.