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Assanee N.,King Mongkut's University of Technology Thonburi | Boonwan C.,Rajamangala University of Technology at Thanyaburi
Energy Procedia | Year: 2011

Currently, there are 14 gasification power plants in Thailand with a total capacity of 5.4 MWe., as of today DEDE invested in 7 plants each with a capacity range of 20-400 kWe and investment cost about 8,000-100,000 baht/kWe. Furthermore, another 4 pilot plants were installed in the Universities such as Naresuan University, Prince Songkhla University, Rajamangala University of Technology Thanyaburi, and Suranaree University of Technology. The investment cost of the thermal gasification plants is relatively high, ranging between 8,000-100,000 baht/kW, because most of plants are under technology improvement for cost reduction. If technology is stable, the investment cost will be able to reduce about 1,000 baht/kW. The 10 gasification power plants are strongly examined in this investigation. It was found that most of plants have a series problem of the inability of control gas production system for both producer gas rate and gas composition resulting from the lack of a good design system for feeding system and tar content removal. In order to develop gasification plants in Thailand, the research in this area must be continuous requirement for ensuring system stability resulting in cheaper investment cost. © 2011 Published by Elsevier Ltd.


Naderi M.Y.,Northeastern University | Nintanavongsa P.,Rajamangala University of Technology at Thanyaburi | Chowdhury K.R.,Northeastern University
IEEE Transactions on Wireless Communications | Year: 2014

Wireless charging through directed radio frequency (RF) waves is an emerging technology that can be used to replenish the battery of a sensor node, albeit at the cost of data communication in the network. This tradeoff between energy transfer and communication functions requires a fresh perspective on medium access control (MAC) protocol design for appropriately sharing the channel. Through an experimental study, we demonstrate how the placement, the chosen frequency, and number of the RF energy transmitters impact the sensor charging time. These studies are then used to design a MAC protocol called RF-MAC that optimizes energy delivery to sensor nodes, while minimizing disruption to data communication. In the course of the protocol design, we describe mechanisms for (i) setting the maximum energy charging threshold, (ii) selecting specific transmitters based on the collective impact on charging time, (iii) requesting and granting energy transfer requests, and (iv) evaluating the respective priorities of data communication and energy transfer. To the best of our knowledge, this is the first distributed MAC protocol for RF energy harvesting sensors, and through a combination of experimentation and simulation studies, we observe 300% maximum network throughput improvement over the classical modified unslotted CSMA MAC protocol. © 2014 IEEE.


Subsingha W.,Rajamangala University of Technology at Thanyaburi
Energy Procedia | Year: 2016

In general, Multi-level converter has been utilized widely in many applications, especially in renewable energy aspects. This is because of the associations in high power, medium switch voltage and lower output total harmonics distortion. In this article, the multi-level converter was constructed as a 2 kW output power of the 3 phase 3 level diode clamped grid connected inverter. The proposed multi-level inverter uses a carrier based space vector pulse width modulation scheme in order to produces the desired output voltage. The scheme is the modulation of three identical reference signals, which is 120°phase shifted to each other comparing to a 10 kHz triangular signal. These reference signals comprise of some harmonics in order to generate a space vector PWM signal for switches in the inverter. A Phase Lock Loop (PLL) is utilized together with the controller in order to phase and frequency locking between the voltage at the point of common connection (PCC) and voltage at the grid system. After the proposed inverter connected to the grid system, it can be injected the inverter current into grid system by using the appropriated PI (proportional-integrator) controller within the control scheme. However, L-C low-pass filter is also utilized at the inverter output for reducing harmonic contents. It results to reducing the output harmonic contents. In which, the value of THDv at PCC is less than 5%. © 2016 Published by Elsevier Ltd.


Subsingha W.,Rajamangala University of Technology at Thanyaburi
Energy Procedia | Year: 2016

This paper present the comparative modulation of Sinusoidal PWM and Third Harmonic Injected PWM Reference signal with carrier signal PD, POD, and APOD on 5 Level Diode Clamp on a R-L load. All of process are simulate with computer program MATLAB/Simulink. The result of simulation has shown value of THDV line-line output voltage on both SPWM inverter and Third Harmonic Injection modulation inverter with PD carrier signal generate a minimum THDV. © 2016 Published by Elsevier Ltd.


Subsingha W.,Rajamangala University of Technology at Thanyaburi
Energy Procedia | Year: 2016

In this proposal article, mathematical model of Photovoltaic model is investigated the relationship of the Photo Voltaic's irradiance, temperature and parameters comparing to its output power. It leads in to an analyzing and developing of the Photovoltaic Simulator. By which, Photovoltaic simulator is utilized by the DC converter circuit with a current feedback control. This may be useful if is possible to implementing into a real world Photovoltaic simulator. In this paper, Photovoltaic simulator is modeled using MATLAB/Simulink program, which is composed of DC converter and a proper control scheme. It can be observed from the simulation results that I-V relationship of the Photovoltaic simulator is quite the same as of such Photovoltaic mathematical model. This means that, it is possible to build a real Photovoltaic simulator in commercial in a further work. © 2016 Published by Elsevier Ltd.


Prasartkaew B.,Rajamangala University of Technology at Thanyaburi
Energy Procedia | Year: 2013

Nowadays, global warming and energy crisis problems become serious issues which affect on all creatures on our earth. One of the best ways to simultaneously address or mitigate these problems is more utilizing the renewable energy sources instead of the fossil fuel. A solar-biomass hybrid cooling system is one of the technologies for the climate change and green-house-gas mitigation. The mathematical model of this system was developed and used in the theoretical prediction of its performance and system design. To assess the accuracy of the developed mathematical model, the obtained experimental data is then compared with the simulation results, with the same operating parameters and weather conditions. This paper presents the validation of the developed model. The validation results show that the simulation results are in good agreement with the experimental results from both qualitative and quantitative points of view. © 2013 The Authors. Published by Elsevier.


Bhumkittipich K.,Rajamangala University of Technology at Thanyaburi | Phuangpornpitak W.,Rajamangala University of Technology at Thanyaburi
Energy Procedia | Year: 2013

This paper presents a new methodology using particle swarm optimization (PSO) for the placement of distributed generation (DG) in the radial distribution systems to reduce the power loss. Single DG placement is used to find the optimal DG location and its size which corresponding to the maximum loss reduction. The proposed method is tested on the 26-bus radial distribution system which modified from the Provincial Electricity Authority (PEA) distribution system. The total power is 8.49 MW and 5.97 MVAR and the power loss is 11.68 kW and 26.08 kVAR. The load flow analysis on distribution use forward-backward sweep methodology. The simulation results show that PSO can obtain the maximum power loss reductions. © 2013 The Authors. Published by Elsevier B.V. © 2013 The Authors. Published by Elsevier B.V.


Chupong C.,Rajamangala University of Technology at Thanyaburi | Plangklang B.,Rajamangala University of Technology at Thanyaburi
Energy Procedia | Year: 2011

PV systems have been increasingly installed worldwide in recent years. Because it produces clean energy, moreover the development of technology is continued therefore the reliability is increasing and the price is decreasing in opposite. To implement the PV system, however, a significant limitation of PV system is the uncertainty of power from the sun. This will affect the quality of the electrical system that connected. Therefore, this article will present the power forecasting of a PV system by calculating the solar radiation, collecting data from weather forecasting, and using Elman neural network to forecast by using data from PV system installed at roof top of Faculty Science and Technology Rajamangala University of Technology Thanyaburi. The results of study found that the tendency to apply this method any further. © 2011 Published by Elsevier Ltd.


Kohsri S.,Rajamangala University of Technology at Thanyaburi | Plangklang B.,Rajamangala University of Technology at Thanyaburi
Energy Procedia | Year: 2011

This paper presents the application energy management system and control system for smart renewable energy power generation. The development of communication platform is use LAB-View technology as a basis design for overall system. The proposed prototype is construct PV 1.8 kWp, Battery 18 kWh, 5 kW Generator. The main central control system will acquire data from the remote renewable energy system. All necessary monitor data are including power generation, load consumption, protection system, and other control parameters will be store at a control unit. All monitoring data are monitored as real-time data therefore the operator can also evaluate the system situation in the current states and make decisions to take an immediate action if needed. The system can be improved by learning from monitored data recorded. Moreover the system itself can forecast and make a decision for future power analysis. © 2011 Published by Elsevier Ltd.


Sakulkhaemaruethai S.,Rajamangala University of Technology at Thanyaburi | Sreethawong T.,Chulalongkorn University
International Journal of Hydrogen Energy | Year: 2011

Mesoporous-assembled TiO2 nanocrystals with very high photocatalytic H2 production activity were synthesized through a modified sol-gel process with the aid of urea as mesopore-directing agent, heat-treated under various calcination temperatures, and assessed for their photocatalytic H2 production activity via water splitting reaction. The resulting mesoporous-assembled TiO2 nanocrystals were systematically characterized by N2 adsorption-desorption analysis, surface area and pore size distribution analyses, X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The experimental results showed that the photocatalytic H2 production activity of the synthesized mesoporous-assembled TiO2 nanocrystal calcined at 500 °C, which possessed very narrow pore size distribution, was extraordinarily higher than that of the commercially available P-25 TiO 2 and ST-01 TiO2 powders. Copyright © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

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