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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) Science and Technology Indonesia Indonesian Journal of Electrical Engineering and Computer Science
Nguyen Van Dung, Nguyen Van
Lac Hong University (LHU)
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Electrical & Electronics Engineering Environmental Science Materials Science & Nanotechnology Physics

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Bidirectional AC/AC converter linking two microgrids in a flexible microgrid Vinh, Nguyen The; Dung, Nguyen Van
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 16, No 1: March 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v16.i1.pp389-406

Abstract

The proposed single-phase flexible AC/AC converter in an AC microgrid controlled by the PWM method is presented and tested with a small capacity. This converter uses a simple and small number of semiconductor switches and passive elements to limit power loss and increase efficiency. It has higher reliability, safety, and continuity of power supply in operation than traditional AC/AC converters due to the power circuit structure of the converter. It has the function of increasing or decreasing voltage when connecting to two microgrids and can be directly connected to distributed energy sources in microgrid systems with distributed power sources and loads. Besides, the AC/AC converter can be connected to the storage system to improve continuity and voltage stability for the grid. The performance of the proposed converter is compared with existing similar converters. The paper presents the analysis of simulation results by OrCAD with power values from 0.1-5 kW and experimental power with typical values in the range of 0.5-3.5 kW at different scenarios of the converter.
Ba3GdNa(PO4)3F:Eu2+ phosphor with blue-red emission colors on white-LED properties Dung, Nguyen Van; Quoc Anh, Nguyen Doan
Indonesian Journal of Electrical Engineering and Computer Science Vol 38, No 3: June 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v38.i3.pp1564-1571

Abstract

The blue/red-emission phosphor Ba3GdNa(PO4)3F:Eu2+ (BGN(PO)F-Eu) is used in this work for diodes emit white illumination (wLED). The phosphor is prepared using the solid-phase reaction. The suitable concentrations of Eu2+ ion dopant is about 0.7% and 0.9%. The BGN(PO)F-Eu phosphor can provide wLED light with the spectral wavelength in the region of blue (480 nm) and orange-red colors (595-620 nm). With the resulted emissions the phosphor can be appropriate for plant growing because they compatible with absorption spectra of plants’ carotenoids and chlorophylls for stimulating the photosynthesis. The phosphor influences on the wLED lighting properties depending on the doping dosages. It is possible to enhance the luminous intensity of the wLED with higher BGN(PO)F-Eu phosphor amount. Meanwhile, the color properties does not get significant improvements. Thus, the BGN(PO)F-Eu phosphor could be used with other luminescent materials to stimulate the hue rendering performance.
High Concentration of Barium Sulfate for Scattering Strength Improvement to Achieve Better Color Uniformity of a WLED Dung, Nguyen Van; Le, Anh-Tuan
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1225-1231

Abstract

This simulation study provides a comprehensive investigation into the influence of varying concentrations of barium sulfate (BaSO4) on the optical characteristics of white light-emitting diodes (WLEDs). The research is conducted through MATLAB-based simulations that employ Mie-scattering theory to accurately model light–particle interactions. BaSO4 is chosen as a scattering medium due to its well-documented advantages, including chemical stability, non-toxicity, cost-effectiveness, and exceptionally high reflectivity across the visible spectrum. These properties make it a promising candidate for improving both the efficiency and the optical quality of WLEDs. In this study, BaSO4 particles are introduced into the WLED structure with the goal of enhancing two key performance metrics: color uniformity and luminous output. Through systematic modeling, scattering efficiencies are calculated at a range of BaSO4 concentrations to evaluate how particle density influences light propagation and distribution within the device. The results demonstrate a clear correlation between increasing BaSO4 concentration and improved scattering efficiency, leading to higher lumen output. However, the findings also indicate that performance gains reach an optimum at specific concentration levels, beyond which excessive scattering may reduce efficiency by causing unwanted light losses. Beyond luminous efficiency, the integration of BaSO4 also contributes positively to the color rendering capability of the WLED, minimizing color deviation and producing a more uniform and natural white emission. This highlights BaSO4’s dual role in enhancing both brightness and optical quality. Collectively, the outcomes of this simulation study emphasize the potential of BaSO4 as a functional scattering additive that can significantly improve WLED design. The insights gained offer valuable guidance for the development of next-generation solid-state lighting devices with superior optical performance, energy efficiency, and color stability.
Bidirectional AC/DC converter connecting AC and DC microgrids for smart grids Dung, Nguyen Van; Vinh, Nguyen The
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 16, No 4: December 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v16.i4.pp2549-2561

Abstract

This paper proposes a converter connecting two independent AC and DC microgrids in a flexible microgrid and smart grid system. With this converter, basic DC/DC converter types such as Flyback are used to develop the power circuit and controller for the converter that is capable of integrating the operating functions for the operation between microgrids. The converter uses bidirectional switching locking technology to simplify the control algorithm. The energy is converted in two directions, AC/DC and DC/AC, with different working principles of increasing and decreasing voltage according to the standards of the distribution grid and DC microgrid. The TDH value is significantly limited when using the recovery circuit solution. The converter is designed, simulated based on OrCAD software, and tested with a capacity in the range of 2-10 kW. The DC microgrid output voltage is 400 VDC, voltage is 220 VAC.
Co-Authors Le, Anh-Tuan Phan Van Hai, Phan Van Quoc Anh, Nguyen Doan Vinh, Nguyen The