1,720,972 research outputs found
Hybrid Renewable System based Pumped Energy Storage for the Electrification of Rural Areas
No full textA footstep and piezoelectric sensor-based power generation system
No full textIn this paper, the energy harvesting capacity of piezoelectric material is applied a footstep energy generation system. Conventional fossil fuels have raised concern about sustenance of the environment. As a means of reducing dependence on fossils fuels, the piezoelectric sensor is touted as a viable replacement. Piezoelectric materials are used to generate alternating current (AC) and direct current (DC) for powering communication devices, lightings and battery charging. 500 modified piezoelectric tiles were assembled to generate required power was then routed to an electronic processing unit containing a microcontroller, voltage rectifier and regulator circuitry. The output can deliver power to a phone, light bulb and battery. Using footsteps, the designed system delivered a maximum power of 4.25 W with full load current of 2.08 A. The 12V 10 Ah battery charging time is 31.25 hours and the full load battery life is 4.81 hours. The designed system was verified via simulation and experimentally. This system can be useful during when grid electricity is disrupted
Design of Completion Detectors in Asynchronous Communication System
No full textIn digital design, there are two types of design,
synchronous design and asynchronous design. In synchronous design, global clock is one of the main system that consume a lot of power. The power in synchronous design is consumed by clock
even if there is no data processing take place. The asynchronous
design that depends on data is clockless and as far as the power is
concerned, asynchronous design does not consume much power
compared with synchronous design and this really make
asynchronus design the preffered choice for low power
consumption. Besides having low power consumption, there are
many advantages of aynchronous design compared with
synchronous design. This paper proposed new dual rail
completion detector (CD), 3-6 CD, 2-7 CD and 1-4 CD for on-chip
communication that are used widely in an asynchronous
communication system. The design of CD is based on the principle
of sum adder. The circuit is designed by using Altera Quartus II
CAD tools, synthesis and implementation process is executed to
check the syntax error of the design. The design proved to be
successful by using asynchronous on-chip communication in the
simulatio
Space Vector Pulse Width Modulation (SVPWM) for Harmonic Reduction Three Phase Inverter System
No full textThis paper presents a simulation and design for reducing harmonics in three-phase inverters using space vector pulse width modulation(SVPWM). Converting Direct Current (DC) to Alternating Current (AC) gives distortion or noise which can be at the source or at theoutput .Problems arise in inverters and other power electronics devices when total harmonic distortion (THD) is high during operation. This noise or distortion can lead to problems for the equipment that being supplied especially in shortening the lifespan of theequipment. The model was simulated using MATLAB/ Simulink with the block set and also M-file. Metal-Oxide-Semiconductor-Field- Effect-Transistor (MOSFET) was used as switches. The SVPWM is used as the control algorithm/system to control the switching schemeof the MOSFETs. The SVPWM as a type of Pulse Width Modulation (PWM) succeeded in reducing the harmonics up to 0.26%. Experiments on a 2-level inverter in the laboratory using DSP microcontrollers contribute to validation of the proposed strateg
A battery integrated multiple input DC-DC boost converter
No full textIn this paper, the proposed single boost converter aims to harness more than one renewable energy (RE) input source and achieve a high voltage gain. The interleaved technique combined with voltage multiplier (VM) cells, reduced inductor current and attained high voltage transfer ratio. The boost converter possesses two unidirectional input ports and a bidirectional input port that is connected to a battery storage. The duty ratios of the power and
interleaving switches are used to regulate the output voltage of the proposed converter. Three operation modes are identified, and steady state analyses of the converter are presented and discussed. The converter can store excess
energy in the battery during periods of abundance and deliver power to the loads when the RE sources are low or unavailable. In addition, the output voltage is higher than that of the conventional boost converter. The converter
delivered 278 V from 12 V and 24 V dual input sources. The converter operation is simulated and verified using MATLAB/Simulink
Integrated PV–BESS-Fed High Gain Converter for an LED Lighting System in a Commercial Building
No full textThe demand for electricity is rapidly growing and renewable energy sources such as solar, wind and tidal energy can compensate the demand to a substantial level. Among these, solar energy is abundant, scalable and is cheaper. The generated energy can be used in an efficient way if the
DC output is directly supplied to the load instead of converting it to AC. Every electrical system is capable of operating in DC and, for example, energy efficient Light Emitting Diode (LED) lights have become popular as they provides more lumens with less power consumption and also can be directly operated from DC. LED lighting system in large commercial buildings has irradiance levels
which vary sigificantly during operation. Extracting maximum power from the energy system and maintaining constant voltage output at different loads is another challenge. This paper proposes a solar Photo Voltaic (PV)-based energy system including Battery Energy Storage System (BESS) for
supplying LED lamps to a commercial building through a modified high gain Luo converter. The Perturb and Observe control algorithm has been used for maximum power extraction from a PV cell whereas PI (Proportional Integral) controllers maintain constant output voltage from PV–BESS
against different irradiance levels. To supply the desired voltages to the LED lighting system, a modified high gain Luo converter is designed. To make the output voltage constant at different load currents, PI and Sliding Mode Controllers (SMC) are designed with the help of the state-space average model. It is found that the sliding mode controller outperforms the PI controller in terms of behavior in the transient period and tracking capability. The system is simulated using MATLAB/Simulink®.
The Sliding Mode Controller has a 95% less transient period and is 75% faster in tracking capability when compared to other controllers. The system could be incorporated with the PV source to obtain green energy
A review of multiple input DC-DC converter topologies linked with hybrid electric vehicles and renewable energy systems
No full textIn this paper, the contemporary development in multiple input dc-dc converters are identified and examined. The
quest to mitigate the difficulties associated with employing renewables in distribution systems and electric vehicles (EVs) has yielded many new converter topologies. These new topologies have easier control, lower parts
count, are cheaper and are worthy alternatives to the typical series or parallel connection of converters. The
converters are identified by three divisions that bother on the isolation between the respective ports. The
electrically connected converters do not have isolation between the ports, and thus, a dc link connects the ports.
Electromagnetically connected converters use a dc-link to connect input ports, but the input ports and output
port are isolated. In magnetically connected converters, input ports are separated by multiple winding transformer, just as the output port is isolated from the input ports by the winding. The formation, structure, characteristics, operation, merits and demerits of the converters will be presented. Thereafter, comparisons will be
done based on the distinct features of the converters. This review identifies that converter properties depend on
the specific application requirement and thus, no converter fulfills all demands in the industry. Prospective future
research trends are suggested. This work aims to update on research done during the time gap since the last
comprehensive reviews
Modeling CO2 Emission in Residential Sector of Three Countries in Southeast of Asia by Applying Intelligent Techniques
No full textResidential sector is one of the energy-consuming districts of countries that causes CO2 emission in large extent. In this regard, this sector must be considered in energy policy making related to the reduction of emission of CO2 and other greenhouse gases. In the present work, CO2 emission related
to the residential sector of three countries, including Indonesia, Thailand, and Vietnam in Southeast Asia, are discussed and modeled by employing Group Method of Data Handling (GMDH) and Multilayer Perceptron (MLP) neural
networks as powerful intelligent methods. Prior to modeling, data related to the energy consumption of these countries are represented, discussed, and analyzed. Subsequently, to propose a model, electricity, natural gas, coal, and oil products consumptions are applied as inputs, and CO2 emission is considered as the model’s output. The obtained R2 values for the generated models based on MLP and GMDH are 0.9987 and 0.9985, respectively. Furthermore, values of the Average Absolute Relative Deviation (AARD) of the regressions using the mentioned techniques are around 4.56% and 5.53%, respectively. These values reveal significant exactness of the models proposed in this article; however, making use of MLP with the optimal architecture would lead to higher accurac
Power sharing analysis of a new modified multi-input interleaved boost converter based on H-Bridge cells
No full textIn this paper, a new modified multi-input boost converter is proposed using H-bridge cells as building blocks and
uncoupled inductors in parallel using interleaved technique as ripple reduction method. The objectives of this paper are to design a high ripple reduction and a high-performance multi-input boost converter. Different operating modes and the switch realization of the new converter are obtained. The modes of operation based on the status of the four switches. The proposed multi-input boost converter is composed of two inputs source that accommodated with some extra semiconductors, inductances and diodes to form the interleaving technique as proposed method. The proposed concept has been investigated through simulation using the MATLAB/Simulink environment. The simulation results confirm the validity of the proposed method, which can be seen as a promising new topology that ensure multi-input converter suitable for renewable energy application
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