International Symposium on Environmental Friendly Energies and Applications 

About: International Symposium on Environmental Friendly Energies and Applications is an academic conference. The conference publishes majorly in the area(s): Photovoltaic system & Renewable energy. Over the lifetime, 123 publication(s) have been published by the conference receiving 470 citation(s).

Biomass gasification technology: The state of the art overview

Abstract: The reduction of imported forms of energy, and the conservation of the limited supply of fossil fuels, depends up on the utilization of all other available fuel energy sources. Biomass is a renewable energy source and represents a valid alternative to fossil fuels. The abundance of biomass ranks it as the third energy resource after oil and coal. Moreover, when compared to fossil fuels, biomass fuels possess negligible sulphur concentrations, produce less ash, and generate far less emissions in to the air. In other words, biomass can deliver significant greenhouse gas reductions in electricity, heat and transport fuel supply. The energy in biomass may be realized by different thermochemical technologies of which gasification is most promising alternative routes to convert biomass to power/heat generation and production of transportation fuels and chemical feedstock. This paper deals with the state of the art biomass gasification technologies, evaluating advantages and disadvantages, the potential use of the syngas and the application of the biomass gasification. Also, this paper provides short overview of the current status of the biomass gasification in Serbia.

Grid-connected PV virtual instrument system (GCPV-VIS) for detecting photovoltaic failure

Abstract: This paper presents a design and development of a Grid-Connected Photo Voltaic Virtual Instrumentation System (GCPV-VIS) which is intended to facilitate monitoring and failure detection of a grid-connected photovoltaic plant using statistical methods. The approach has been validated using an experimental database of environment and electrical parameters from a 1.98 kip plant installed at the University of Huddersfield, United Kingdom. There are few instances of statistical tools being deployed in the analysis of PV measured data. The main focus of this research is, therefore, to devise a Virtual Instrument capable of simulating theoretical performances of PV systems and deploying statistical analysis of PV real-time data. The fault detection is based on the comparison between measured and theoretical output power using t-test statistical analysis. The obtained results indicate that the proposed method can detect the faults of the grid-connected PV system, and can be used for continuous monitoring of PV system status.

The best MPPT algorithms by VSAS approach for Renewable Energy Sources (RES)

Abstract: VSAS (Variable Structure Automatic Systems) control methodology is applied to clarify the rationale behind Maximum Power Point Tracking and get the best optimization algorithm. Two algorithms are developed the Modified and Enhanced Perturb and Observe Algorithm (MEPO) the Robust Unified Control Algorithm (RUCA). The maximum power is computed online using a very simple algorithm. Compared to the other algorithms like Perturb and Observe (PO), Hill Climbing, Incremental Encoder (InCod) and and SMC approach it is proven more efficient and faster despite using low frequency commutation. The proposed MPPT has several advantages: simplicity, high convergence speed and is independent on PV array characteristics. The obtained results have proven that the MPPT is tracked even under sudden change of irradiation level.

SSTL I/O Standard based environment friendly energyl efficient ROM design on FPGA

Abstract: Stub Series Terminated Logic (SSTL) is an Input/output standard. It is used to match the impedance of line, port and device of our design under consideration. Therefore, selection of energy efficient SSTL I/O standard among available different class of SSTL logic family in FPGA, plays a vital role to achieve energy efficiency in design under test (DUT). Here, DUT is ROM. ROM is an integral part of processor. Therefore, energy efficient design of RAM is a building block of energy efficient processor. We are using Verilog hardware description language, Virtex-6 FPGA, and Xilinx ISE simulator. We are operating ROM with the highest operating frequency of 4th generation i7 processor to test the compatibility of this design with the latest hardware in use. When there is no demand of peak performance, then we can save 74.5% clock power, 75% signal power, and 30.83% I/O power by operating our device with 1GHz frequency in place of 4GHz. There is no change in clock power and signal power but SSTL2_H_DCI having 80.24% 83.38% 62.92% and 76.52% and 83.03% more I/O power consumption with respect to SSTL2_I, SST18_I, SSTL2_I_DCI, SSTL2_II, and SSTL15 respectively at 3.3GHz.

Analysis and distributed control of power flow in DC microgrids to improve system efficiency

Abstract: DC Microgrid attains popularity in integrating renewable energy sources and batteries. It also has the potential to achieve higher efficiency than ac power grid with optimized power flow. In this paper, a general dc microgrid is modeled based on a cluster of general dc nodes, which includes constant power renewables generation, droop-controlled voltage source and different kinds of load. Then the dc power flow is solved for optimization. A voltage restoration method based on consensus algorithm is used to restore the voltage deviation from droop characteristic. An enhanced current regulator is adopted to guarantee the accurate load sharing even under the influence of sensor drift and line resistance. A tie line power flow control method is proposed to regulate the tie line power directly and increase the system efficiency at light load condition. All the considered methods only need the local information and the information from its nearest neighbor thus the system expendability is guaranteed. Simulation and experiment results are provided to validate the proposed methods.