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This study focuses on the power supply system of Hokkaido, the largest and northernmost prefecture in Japan and identifies the barriers to raise the share of wind and solar power to 100%. An increase in total system cost versus the penetration of wind and solar power into the energy system was examined based on the current technology and cost level. The effect of cost reductions in solar power and...
Grid-connected distributed PV system has become an important utilization of solar energy, but it has adverse effects on the load characteristics, power quality and stability of regional power grids for its randomness and volatility. In order to reflect the influence of grid-connected distributed PV on the load characteristics of regional power grids accurately, three typical topologies of open distribution...
A novel piezoelectric-electromagnetic hybrid energy harvester based on vortex-induced vibration was presented, which could convert the kinetic energy of water into electrical energy by means of vortex-induced vibration. In this study, a series of experiments were carried out to compare the efficiencies of the novel hybrid energy harvester with the single piezoelectric or electromagnetic energy harvesters...
In the scenario of growing population, it is known that the dépendance on non renewable energy is increasing exponentially. In any IC engine only 40% of the energy given by the fuel is utilized. The remaining goes as heat in exhaust gas and coolant. In this context a waste recovery system using Organic Rankine Cycle (ORC) has been developed to increase the percentage of energy conversion of burnt...
A new method of wide-area backup protection is proposed based on fault charge comparisons according to the wide-area fault charge information of power grid. The node Intelligent Electronic Device (IED) associated domain is defined in the method, and the relationship of positive sequence fault charges for associated domain boundaries is sought. Then conceptions of the calculational charge and the reference...
The microgrid concept provides a quite appealing solution for overcoming the challenges of integrating renewable energy sources and distributed generators into power grids. Advances in the microgrids control have improved the microgrids potential to be integrated into the conventional electrical systems in a higher capacity. This improvement not only covers their internal control performance and connection/disconnection...
This paper proposes a temperature sensing voltage-controlled oscillator (VCO) with bandgap reference voltage circuit (BGRV) for applications to low power management and wireless systems integrated circuits. This CMOS bandgap core reference voltage makes use of linear combination of PTAT current and BJT VBE to generate bandgap reference voltage source. And this PTAT voltage is to control voltage-controlled...
A new method to diagnose open-line fault of the branch line of the medium voltage distribution network without ground is presented based on electric power distribution information system data and association rules algorithm. First through the analysis of the correlated data of electric power distribution information system, a method of mining association rules based on data feature selection is established...
This paper presents the modelling, simulation and hardware evaluation of a grid tied inverter suitable for wind energy conversion systems. The grid-tied wind power converter converts the energy harvested from wind to DC through a permanent magnet synchronous generator using a simple diode rectifier and then converts it back to AC using a pulse width modulated inverter before coupling the wind turbine...
This paper considers the scheduling issue of charging and discharging on a micro-grid with ESS and dynamic price, where the micro-grid consists of an energy management system, a photovoltaic system, an energy storage system, normal loads, electric vehicles and their charging piles. The mathematical formulation of the problem is defined based on a day-ahead design mode of scheduling. An efficient algorithm...
Russian Federation is one of the world's largest importers of energy raw materials. However, within the country, there are many problems associated with the efficiency of power plants and power supply in remote regions, particularly in the Arctic zone. Solving these problems is possible through the development of renewable energy. This paper represents the analysis of the resource base of renewable...
The main problem which often occurs in wind turbine systems is getting the maximum power output and maintaining the DC link voltage at a constant value through wind fluctuation. This paper proposed to maintain the DC link voltage during stand-alone condition, it takes a battery as energy storage with a bidirectional buck-boost converter to regulate charging and discharging mode, alternately. Control...
This paper presents an integrated artificial neural network (ANN) approach for the design and prediction of energy generated from a thermoelectric generator (TEG) under the influence of the operating environmental parameters. The unique ANN model can predict the output voltage generated as well as ensuring the reliability of the output. Deriving of individual input parameter can also be obtained from...
With the diversification of the demand for auxiliary services in power system and the new form reconstructed by economic relations among related components of electric power system under new electricity reform, it is necessary to construct a reasonable auxiliary service cost compensation mechanism to adapt to special reforms of electricity auxiliary service market in the future. In this paper, the...
Bioenergy and biomass production from paddy microbial fuel cell (PMFC) was assessed throughout the life cycle under greenhouse condition. Performance of traditional sediment PMFC was compared to the earthen membraned double chamber PMFC (DPMFC). Average power density normalized to a plant growth area (PGA) was 87% higher in DPMFC than SPMFC with same electrode material and area, while polarization...
The paper presents results of the experimental investigation on an internal combustion (IC) over-expanded engine fueled with biomethane. During this research the pressure trace of the combustion was collected and on that basis the analysis of the combustion process has been made. The measurements were done for two engine configurations with the classic Otto cycle and the over-expanded cycle. Over-expanded...
An accurate estimation of the mechanical forces on the primary conductors of a current transformer (CT) is a complex task, since it essentially is a function of leakage flux between the primary and the secondary windings. The leakage flux, in turn, depends strongly on the geometry of the CT. Due to variations in the geometry of the CTs, a simple analytical or empirical expression for force calculation...
This study analyze the cradle to gate total CO2 emission of the bio-hydrogen supply chain system in Indonesia. Waste wood from forestry area collected as a feedstock of hydrogen power plant in the capital city of forestry area. A life cycle inventory as part of life cycle assessment methodology is use to evaluate the emission of the new energy system. The system boundary are including harvesting,...
This study aims to analyze the challenges of the palm oil biodiesel program to meet the goals of sustainable development and to provide recommendations toward a sustainable palm oil biodiesel program using quantitative analysis of potential policy options based on set of sustainability criteria. The criteria to which the development is assessed being sustainable or not are adopted from the practical...
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