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This paper proposes a newly chaotic maps integrated stochastic fractal search (CMSFS) for solving the optimal distributed generation placement (ODGP) problem in radial distribution networks. The objective of the problem is to minimize the network real power loss satisfying the operational constraints of distributed generations (DGs) and the network. The proposed CMSFS approach is an improvement of the standard SFS approach by integrating chaotic maps into SFS to enhance its solution quality and convergence rate. The experimental results on the IEEE 33, 69, and 118-bus networks and the power loss reduction percentages with the integration of the optimal number of non-unity power factor DG are 99.21%, 99.43% and 92.36%, respectively. Moreover, the simulation results have also shown that the proposed CMSFS can provide better solution quality than many other methods for the considered scenarios. Therefore, the proposed CMSFS can be an effective alternative approach to the ODGP problems in RDNs.
Thanh Long Duong; Phuoc Tri Nguyen; Ngoc Dieu Vo; Minh Phuong Le. A newly effective method to maximize power loss reduction in distribution networks with highly penetrated distributed generations. Ain Shams Engineering Journal 2020, 12, 1787 -1808.
AMA StyleThanh Long Duong, Phuoc Tri Nguyen, Ngoc Dieu Vo, Minh Phuong Le. A newly effective method to maximize power loss reduction in distribution networks with highly penetrated distributed generations. Ain Shams Engineering Journal. 2020; 12 (2):1787-1808.
Chicago/Turabian StyleThanh Long Duong; Phuoc Tri Nguyen; Ngoc Dieu Vo; Minh Phuong Le. 2020. "A newly effective method to maximize power loss reduction in distribution networks with highly penetrated distributed generations." Ain Shams Engineering Journal 12, no. 2: 1787-1808.
This paper concerned with the development and implementation of smart street lighting control system based using Led lamp and Lora Wireless communication. Smart street lamps have been developed for over several years. These technologies have played an important role in urban safety, energy conservation. Currently, a traditional street lights are automatically turn on or off based on timer or day/night sensor. LEDs are now the standard replacement for legacy lighting in most cities around the world. At the same time, smart controls are becoming more mainstream and are increasingly installed alongside LED deployments. Recently, the conventional light sources are replaced by Led, which have so many advantages such as: energy savings, long lifetime, high reliability, pure light color, fast response, and friendliness to the environment. Furthermore, the intensity of the LED can be controlled easily. In this paper, the smart lighting system is designed to control and monitor devices via wireless transmission frequencies below 1 GHz. The system will include many types of devices connected to each other by a gateway. The transmit distance is about 2km in the urban area and up to 5km in rural area. The proposed smart street public lighting provides some advantages features such as: Automatic mode, Remote control mode, Connection disconnection mode, Manual direct operation mode. The smart lighting system has been built at Ho Chi Minh City University of Technology to meet the standards for data transmission. And some experimental resutls are provided to show the effectiveness of the porposed system.
Tung Thanh Ngo; Phong Hoai Nguyen; Dinh Huy Le Ta; Huy Minh Nguyen; Tuyen Dinh Nguyen; Phuong Minh Le. Development and implementation of smart street lighting system based on LoRa Technology. Science & Technology Development Journal - Engineering and Technology 2020, 2, 193 -206.
AMA StyleTung Thanh Ngo, Phong Hoai Nguyen, Dinh Huy Le Ta, Huy Minh Nguyen, Tuyen Dinh Nguyen, Phuong Minh Le. Development and implementation of smart street lighting system based on LoRa Technology. Science & Technology Development Journal - Engineering and Technology. 2020; 2 (3):193-206.
Chicago/Turabian StyleTung Thanh Ngo; Phong Hoai Nguyen; Dinh Huy Le Ta; Huy Minh Nguyen; Tuyen Dinh Nguyen; Phuong Minh Le. 2020. "Development and implementation of smart street lighting system based on LoRa Technology." Science & Technology Development Journal - Engineering and Technology 2, no. 3: 193-206.
This paper presents the implementation of a two-stage light-emitting diode (LED) driver based on commercial integrated circuits (IC). The presented LED driver circuit topology, which is designed to drive a 150 W LED module, consists of two stages: AC-DC power factor correction (PFC) stage and DC/DC power converter stage. The implementation of the PFC stage uses IC NCP1608, which uses the critical conduction mode to guarantee a unity input power factor with a wide range of input voltages. The DC/DC power converter with soft-switching characteristics for the entire load range uses IC FLS2100XS. Furthermore, the design of an electromagnetic interference (EMI) filter for the LED driver and the dimming control circuit are discussed in detail. The hardware prototype, an LED lighting system, with a rated power of 150 W/32 V from a nominal 220 V/50 Hz AC voltage supply was tested to show the effectiveness of the design. The presented LED driver was tested for street lighting, and the experimental results show that the power factor (PF) was higher than 0.97, the total harmonics distortion (THD) was lower than 7%, and the efficiency was 91.7% at full load. The results prove that the performance of the presented LED driver complies with the standards: IEC61000-3-2 and CIRSP 15:2009.
Ngo Thanh Tung; Nguyen Dinh Tuyen; Nguyen Minh Huy; Nguyen Hoai Phong; Ngo Cao Cuong; Le Minh Phuong. Design and Implementation of 150 W AC/DC LED Driver with Unity Power Factor, Low THD, and Dimming Capability. Electronics 2019, 9, 52 .
AMA StyleNgo Thanh Tung, Nguyen Dinh Tuyen, Nguyen Minh Huy, Nguyen Hoai Phong, Ngo Cao Cuong, Le Minh Phuong. Design and Implementation of 150 W AC/DC LED Driver with Unity Power Factor, Low THD, and Dimming Capability. Electronics. 2019; 9 (1):52.
Chicago/Turabian StyleNgo Thanh Tung; Nguyen Dinh Tuyen; Nguyen Minh Huy; Nguyen Hoai Phong; Ngo Cao Cuong; Le Minh Phuong. 2019. "Design and Implementation of 150 W AC/DC LED Driver with Unity Power Factor, Low THD, and Dimming Capability." Electronics 9, no. 1: 52.
The multilevel indirect matrix converter (IMC) is a merit of power converter for feeding a three-phase load from three-phase power supply because it has several attractive features such as: Sinusoidal input/output currents, bidirectional power flow, long lifetime due to the absence of bulky electrolytic capacitors. As compared to the conventional IMC, the multilevel IMC provides high output performance by increasing the level of output voltage. In this paper, the novel approach topology of multilevel IMC by using the combination of the cascaded rectifier and the three-level T-Type inverter is introduced. Furthermore, the new space vector pulse width modulation (SVPWM) method for the presented multilevel IMC that eliminate the common-mode voltage is proposed in this paper. The simulation study is carried out in PSIM software to verify the proposed modulation method. Then, an experimental system is built using a three-phase RL load, a multilevel IMC, a DSP controller board and other elements to verify the effectiveness of the proposed modulation method. Some simulation and experimental results are illustrated to confirm the theory analysis.
Nguyen Dinh Tuyen; Le Minh Phuong. SVPWM Method for Multilevel Indirect Matrix Converter with Eliminate Common Mode Voltage. Applied Sciences 2019, 9, 1342 .
AMA StyleNguyen Dinh Tuyen, Le Minh Phuong. SVPWM Method for Multilevel Indirect Matrix Converter with Eliminate Common Mode Voltage. Applied Sciences. 2019; 9 (7):1342.
Chicago/Turabian StyleNguyen Dinh Tuyen; Le Minh Phuong. 2019. "SVPWM Method for Multilevel Indirect Matrix Converter with Eliminate Common Mode Voltage." Applied Sciences 9, no. 7: 1342.
This paper presents a new load sharing control between paralleled three-phase inverters in an islanded-microgrid based on the line impedance estimation online by the use of the Kalman filter. We can solve the mismatch of power sharing when the line impedance changes due to the temperature and frequency, significant differences of line parameters and requirements of Plug-and-Play mode of inverters connected to the microgrid. Moreover, the paper also presents a new Droop control method working with the line impedance which is different from the Droop traditional algorithm when the line impedance is assumed pure resistance R or pure inductance X. In the paper, the line impedance estimation for parallel inverters uses the least squares method combined with Kalman filter. In addition, secondary control loops are designed to restore the voltage amplitude and frequency of the microgrid by using a combined nominal value SOGI-PLL with generalized integral block and phase lock loop to exactly monitor the voltage magnitude and frequency phase at common PCC. Control model has been simulated in Matlab/Simulink with three voltage source inverters connected in parallel for different ratios of the power sharing. The simulation results have shown the accuracy of the proposed control method. Therefore, the proposed adaptive droop control method based on line impedance estimation can be an alternative one for load sharing control in islanded microgrids.
Phuong Minh Le; Duy Vo Duc Hoang; Hoa Thi Xuan Pham; Huy Minh Nguyen. New adaptive droop control with combined line impedance estimation method for parallel inverters. Science and Technology Development Journal 2016, 19, 45 -64.
AMA StylePhuong Minh Le, Duy Vo Duc Hoang, Hoa Thi Xuan Pham, Huy Minh Nguyen. New adaptive droop control with combined line impedance estimation method for parallel inverters. Science and Technology Development Journal. 2016; 19 (4):45-64.
Chicago/Turabian StylePhuong Minh Le; Duy Vo Duc Hoang; Hoa Thi Xuan Pham; Huy Minh Nguyen. 2016. "New adaptive droop control with combined line impedance estimation method for parallel inverters." Science and Technology Development Journal 19, no. 4: 45-64.
The grid-connected inverters that use synchronous reference frame based phaselocked loop SRF-PLL are applied very popular. The function of SRF-PLLs is fast and accurate estimation of frequency, phase angle, and magnitude of grid voltage. The power quality of the current injected into the grid depends on these estimated parameters. The measurements or processes of data conversion can typically introduce the dc offset in the measured grid voltage. The dc offset is one of the reasons for causing errors for the estimated parameters of the grid voltage and causes injected current with harmonic distortions. This paper proposes a technique of dc offset compensation for SRF-PLL based on the Second Order Generalized Integrator (SOGI). The simulation results validated the performance and robustness of the proposed technique.
Tho Quang Tran; Anh Viet Truong; Hoan Van Trao; Phuong Minh Le. Compensation of offset for SRF-PLL in grid-connected inverters. Science and Technology Development Journal 2015, 18, 5 -15.
AMA StyleTho Quang Tran, Anh Viet Truong, Hoan Van Trao, Phuong Minh Le. Compensation of offset for SRF-PLL in grid-connected inverters. Science and Technology Development Journal. 2015; 18 (3):5-15.
Chicago/Turabian StyleTho Quang Tran; Anh Viet Truong; Hoan Van Trao; Phuong Minh Le. 2015. "Compensation of offset for SRF-PLL in grid-connected inverters." Science and Technology Development Journal 18, no. 3: 5-15.