Energy Management Articles
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Harmonic and interharmonic distortion analysis in the grid-connected wind electric generator
The operation of wind turbines has an impact on the power quality at the connected electric network. The integration of wind electric generators with the power grid becomes a headache for power engineers in several aspects. Harmonic distortion is one of the most important phenomena which affect the grid performance. This paper provides an in-depth discussion on harmonic and interharmonic ...
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Characteristics of modern nonlinear loads and their influence on systems with distributed generation
Nonlinear electronic loads may demonstrate unexpected reactions to variations in power system voltage. This effect of the electrical load may be very significant in distributed generation power systems containing relatively small generators. This paper reviews modern nonlinear electronic load current consumption mechanisms and provides typical current waveforms. Based on extensive measurements ...
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Hardware-in-the-Loop testing platform for distributed generation systems
The rapid validation of the expected performance of distributed generation installations is a critical step in the design process. However, the plethora of distributed generator types and the uniqueness of the load characteristics make the testing quite challenging. This paper introduces an original approach to Hardware-in-the-Loop simulation aimed to evaluate the performance and suitability of ...
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Power electronics for distributed and co-generation
Distributed and Co-Generation has great growth potential, as the world is becoming more energy dependent and energy demanding. Distributed and Co-Generation creates alternative solutions to serve the growing energy market. In this paper, a comprehensive review of the different sources of distributed power is discussed including the main sources of the dispersed generation such as solar energy, ...
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Programmed PWM to improve power quality in systems with distributed generation units
Pulse-Width Modulated (PWM) inverters are widely applied in Distributed Generation (DG) units and power quality equipment owing to their excellent performance and flexible control means. Programmed PWM (PPWM), as a special type of optimal PWM strategy, theoretically allows for setting the fundamental and the selected harmonic amplitudes directly to arbitrary values. The algorithms for solving ...
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Application of power electronics with the US DOE distributed generation programme
Power electronics play an important role in achieving affordable, highly fuel-efficient fuel cell power generation plants and will enable the US Department of Energy's Office of Fossil Energy Fuel Cells programme to achieve higher national goals: environmental, economic and energy security. The initial focus on power electronics has been to understand the interactions between the SOFC stack, the ...
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Legal Lookout: Executive Order Supports Alternative Fuel Use
On Jan. 24, 2007, President Bush signed Executive Order (EO) 13423, Strengthening Federal Environmental, Energy and Transportation Management, which mandates that federal agencies reduce oil consumption, use more alternative fuels and curb greenhouse gas emissions. In his 2007 State of the Union address, Bush announced plans to reduce U.S. gasoline usage by 20 percent in 10 years. The EO also ...
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Solar Water Distillation System, Solar Thermal Energy Conversion System
Innovation in Water and Energy Access to Water and Energy is a Human Right and Fundamental Freedom to share the “gift of life”. The US. Patent and Trademark Office have awarded two Patents US 6,494,995 B1 for Solar Water Distillation System and US 7,127,894 B2 for Solar Thermal Energy Conversion System to the Inventor Mr.Hammam Battah, P.E, having 45+ years of Professional Engineering ...
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Thermodynamic and environmental consideration of advanced gas turbine cycles with reheat and recuperator
The role of gas turbine power plants in electrical energy production has been considerably increased in the last two to three decades. Various methods have been proposed to improve the performance of gas turbine cycles. In this research, two methods, a reheat cycle (RC) and a cycle with a reheat and a recuperator (RHC), were investigated and compared with a simple cycle (SC). The main objective ...
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Evaluation of the optimal performance of passenger vehicle by integrated energy-environment-economic modeling
Analysis of multi dimensional interactions of flow of energy in passenger vehicle is a complex task that necessitates development and utilization of analytical tools. Development of analytical tools with high complexity is usually based on conclusions of many concepts and theories from different scientific disciplines. In this approach, Passenger vehicle is supposed to be organized in the form of ...
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Optimum distribution of heat exchanger inventory and optimum thermal capacitance rate matching for power optimisation of a regenerated closed Brayton cycle
The power output of the cycle is taken as objective for performance analysis and optimisation of an irreversible regenerated closed Brayton cycle coupled to variable-temperature heat reservoirs. The analytical formulae about the relations between power output and pressure ratio are derived with the heat resistance losses in three heat exchangers, the irreversible losses in the compressor and ...
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Combined Heat and Power (CHP) essentials
'CHP essentials' introduces the concept of power and heat 'production possibility sets', starting at the cradle of CHP, i.e., the thermal power generation plant. The latter always occasions 'fatal' heat that is either recovered (the 'merit' of CHP) or wasted (condensing). This split paves the way to defining the production possibility sets of CHP plants, shown for steam turbines, internal ...
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Qualifying Combined Heat and Power (CHP) activity
The EU 2002 draft and 2004 final CHP Directives propose qualifying CHP activity with the quality norm. This norm benchmarks the energy efficiency of CHP plant outputs on external reference power and heat efficiencies. Because the quality norm amalgamates cogeneration and condensing activity its application entails particular perverse effects for high-quality and adapted scale investment in CHP ...
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Power excursion of the training and research reactor of Budapest University
A three-dimensional neutronic code POWEX-K has been developed, and it has been coupled with the subchannel thermal-hydraulic core analysis code MI based on the momentum integral model. This forms the integrated neutronic/thermal hydraulics code system POWEX-K/MI for the accident analysis of the training and research reactor at the Budapest University of Technology and Economics (BME Reactor). An ...
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Ratio control with logarithmic logics in a new P&P control algorithm for a true fuel-efficient reactor
The concept of expending minimum control energy while stabilising or manoeuvring reactor power for a nuclear reactor is the key for a fuel-efficient reactor control. This concept results from treating the reactor close to its natural characteristics by a new Power and Period (P&P) control scheme. This is proven by spending only the required rate of reactivity (not more) to govern the power by ...
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APS - Redhawk Power Station, Arlington, AZ
APS (Arizona Public Service) has been a leading provider of electricity and energy products and services to the Western United States for over a century. With power plants located throughout the Southwestern U.S., APS provides natural-gas, coal and nuclear generated electrical power to the region. Project Description and ChallengesAPS commissioned the Redhawk Power Station in 2002. The plant is ...
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Thermodynamic analysis of a thermoelectric device
Thermoelectric devices are the possible candidates to generate direct electricity from the available thermal radiation as well as other heat sources. As compared with conventional power generating devices, they are more compact, longer-lived and environmental friendly. In the present study, the thermoelectric diode is considered and electronic as well as Carnot efficiency of the device are ...
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Exergy analysis of a natural gas fired combined cycle power generation unit
Combined cycle power generation units are becoming popular due to their higher energy conversion efficiency and reduced pollutants and greenhouse gas emissions. In the present work, exergy analysis of a natural gas fired combined cycle power generation unit is performed to investigate the effect of gas turbine inlet temperature and pressure ratio on exergetic efficiency for the plant and exergy ...
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Sustainability as a matter of social context: information technologies and the environment
The paper focuses on the potential of Information and Communication Technology (ICT) to improve the sustainability of residential buildings. While ICT can contribute to improving building energy efficiency (e.g., energy management systems) there are also plausible scenarios of an increasing energy demand triggered by ICT use. The main argument of this paper is that harnessing the sustainability ...
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District Energy Comes of Age
Three milestones in 2006 signal new energy for an old idea. When Thomas Edison wrote, “Genius is one percent inspiration, ninety-nine percent persperation,” he could have been describing how hard-working district energy executives feel about their accomplishments in 2006. How else to account for the sense of momentum in a previously-obscure sector of the energy industry that marked its commercial ...
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