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[IEEE 2018 4th International Conference on Green Technology and Sustainable Development (GTSD) - Ho Chi Minh City, Vietnam (2018.11.23-2018.11.24)] 2018 4th International Conference on Green Technology and Sustainable Development (GTSD) - Impact of Ancillary Services and Its Prices on Large-Scale Solar and Wind Power Penetration in Electricity Market
摘要： Nowadays, solar and wind power generation is an important part of the power sources in many countries all over the world. However, due to the variability and uncertainty of these sources, stable operation of the power system with large solar and wind power penetration is a big challenge for system operators. In order to enhance the contribution efficiency of solar and wind power in the power market, a strong ancillary service system is essential and must be reasonable priced. The ancillary services considered in this paper are spinning reserve, non-spinning reserve. In addition, a model for calculating and comparing generation costs for energy and ancillary services, with and without penetration of solar and wind power in the power market have been proposed. Consequently, this model has been developed and validated with a case study. The results show that in a power system with large proportion integration of solar and wind power, the energy and ancillary services generation costs for the power system are high. Besides, the feed-in tariffs of solar and wind power are more expensive than the traditional electricity generation, which leads to high locational marginal prices of the electricity market.
关键词： Ancillary service,Renewable energy,Solar power,Wind power,Electricity market
更新于2025-09-19 17:15:36
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[ASME ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology - Boston, Massachusetts, USA (Monday 30 June 2014)] Volume 1: Combined Energy Cycles, CHP, CCHP, and Smart Grids; Concentrating Solar Power, Solar Thermochemistry and Thermal Energy Storage; Geothermal, Ocean, and Emerging Energy Technologies; Hydrogen Energy Technologies; Low/Zero Emission Power Plants and Carbon Sequestration; Photovoltaics; Wind Energy Systems and Technologies - Magnesium Hydride Slurry — A Better Answer to Hydrogen Storage
摘要： Hydrogen has many properties that make it an attractive energy storage medium for a sustainable future. But hydrogen is also difficult to store safely and cheaply. By storing hydrogen in an oil-based slurry with powdered magnesium hydride, cheap and safe hydrogen storage can be realized. This paper describes the characteristics and benefits of cycling hydrogen in and out of magnesium hydride slurry. Based on our experience with magnesium hydride slurry, we have performed a study to evaluate the cost effectiveness of applying bulk hydrogen storage, using magnesium hydride slurry, in a baseload wind power system that we will also discuss. This study concludes that a 150 MW baseload wind power system would produce an Internal Rate of Return (IRR) of 10% with an electric price of $0.088/kWh. The costs and performance characteristics of this power plant are described.
关键词： electricity storage,energy storage,hydrogen storage,magnesium hydride slurry,baseload wind farm
更新于2025-09-19 17:15:36
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Study on the Energy Saving Potential for Semi-Transparent PV Window in Southwest China
摘要： To study Semi-Transparent photovoltaic (STPV) windows, experiments were conducted to test the energy potential of STPV window installed in buildings. Two identical rooms were built up as experimental units; one was fitted with amorphous silicon (a-silicon) photovoltaic (PV) windows, and another was fitted with a conventional window. The interactional influence was analyzed among air conditioning energy consumption, lighting energy consumption, and energy generation. It can be concluded that STPV windows could provide 0.26 kWh/per day and save 29% on comprehensive building load on a typical sunny day. In order to further investigate, buildings installed with STPV windows in four typical cities with different climate environments in southwest China were simulated and analyzed. The cooling load of the buildings were all decreased while the heating energy consumption and lighting energy consumption were lightly increased. The energy generation of STPV windows was highest in Lhasa at 402.1 kWh/year. The energy saving potential of STPV windows was predicted with good values; 54% in Kunming.
关键词： electricity consumption,southwest China,building integrated photovoltaic (BIPV),STPV window,energy generation
更新于2025-09-19 17:15:36
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Vertical bifacial photovoltaics a?? A complementary technology for the European electricity supply?
摘要： Thanks to the two diurnal generation peaks, vertical bifacial photovoltaic power plants (VBPV) with a north-south axis represent an option to meet the challenges of a mismatch between electricity demand and the generation profile of conventional photovoltaic systems (C-PV). Despite this promising characteristic, it is hardly possible to assess the technical and economic properties of VBPV on the basis of existing studies. The present work is a contribution to close this gap. Among other things, the conducted analyses included electricity generation, market revenues, levelized costs of electricity (LCOE) and the cost-reducing effect of VBPV in a national electricity system. C-PV was used as a benchmark in all analyses. Electricity generation was simulated at twelve European sites in four countries. It has been found that above a latitude of 50° VBPV generates more electricity than C-PV. Due to the higher investments, VBPV had higher LCOE at all locations investigated. The results also showed that VBPV can generate higher revenues in electricity markets with a high share of C-PV capacity, but that these additional revenues are not yet sufficient to compensate for the higher investments. With an optimising electricity market model, it was also found that VBPV can contribute to reducing system costs in an electricity system with high shares of C-PV capacity. Against the background of the increasing importance of PV for the electricity supply of most European countries, these findings are of particular importance. In summary, it can be said that VBPV has significant potential at both the business and macro-economic level and that decision makers should promote the market entry of this technology.
关键词： Energy transition,Electricity market,System-friendly renewables,Electricity system costs,PV,Market value
更新于2025-09-19 17:13:59
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Research on Grid Parity Predictions of Centralized Photovoltaic Electricity
摘要： Over the past decade, the photovoltaic (PV) industry in China has made great progress. However, this progress benefited from a series of subsidy policies, and with the continuous enlargement of the scale of centralized PV (CPV), the large subsidies have created great pressure on government finance, so achieving grid parity in CPV electricity is an urgent matter. This paper studies the grid parity of CPV electricity. First, this paper calculates the levelized cost of energy (LCOE) of CPV electricity. Second, using historical data and a dual learning curve, the paper predicts the LCOE of CPV electricity under scenarios with different resource zones and utilization times. Third, the paper predicts the LCOE of coal-fired electricity and draws conclusions based on changes in the price of coal and charcoal. Finally, the paper predicts when grid parity in CPV electricity in different resources areas will be achieved.
关键词： learning curve,centralized photovoltaic electricity (CPV),levelized cost of energy (LCOE),grid parity
更新于2025-09-19 17:13:59
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Optimal operational strategy for an offgrid hybrid hydrogen/electricity refueling station powered by solar photovoltaics
摘要： This study introduces a novel concept to provide both electric charging and hydrogen refueling at the same location. A hybrid hydrogen/electricity refueling station (HERS) powered only by solar photovoltaics in a remote area without access to the electrical grid is proposed. This station provides electricity for battery electric vehicles (BEVs) and simultaneously produces hydrogen for hydrogen fuel cell vehicles (HFCVs). Owing to the variability of PV power output and electricity price, electricity and hydrogen demands, this study investigates a possible operational strategy for the offgrid HERS. The objective is to propose optimal operational strategies for such a station to maximize profits by selling electricity and hydrogen to owners of both BEVs and HFCVs. Failure to supply electricity and hydrogen is treated as a penalty in the target function. The scenario-based stochastic method is adopted for this uncertainty modeling, and the conditional value-at-risk is also considered for evaluating the financial risks. The results reveal that 1) the proposed HERS can simultaneously supply the demands of the BEVs and HFCVs and 2) the behavior of HERS (providing energy to BEVs or HFCVs) is determined by several major factors, namely, electricity and hydrogen prices, and the penalty coefficients.
关键词： Conditional value-at-risk,Electrical vehicles,Operational strategy,Hydrogen-fueled vehicles,Hybrid hydrogen/electricity refueling station,Solar photovoltaics,Mixed-integer linear programming
更新于2025-09-19 17:13:59
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[Institution of Engineering and Technology 5th IET International Conference on Clean Energy and Technology (CEAT2018) - Kuala Lumpur, Malaysia (5-6 Sept. 2018)] 5th IET International Conference on Clean Energy and Technology (CEAT2018) - Conducting Polymers: New Arena in Dye-sensitized Solar Cells
摘要： The combined heat and power (CHP) systems can provide heat and electricity simultaneously. They are promising in the future energy landscape because of high efficiency and low emissions. This paper proposes a new operation optimization model of CHPs in deregulated energy markets. Both CHPs’ overall efficiency and heat to electricity ratio are closely linked with the loading level, which are dynamically determined in this paper. A discrete optimization model is then proposed to determine the optimal real-time operation strategies for the CHPs. The optimization problem is solved by the interior point method with discrete time intervals, in which the discrete optimal operation points can be identified effectively. This step projects the potential operation strategies that could produce maximum benefits. Finally, a dynamic programming algorithm is developed to maximize the profits of CHPs through dynamically modifying the operation strategies projected in the previous step considering transient constraints. The proposed new methodology is demonstrated on a 1-MW CHP system with real-time data.
关键词： heat to electricity (H2E) ratio,operation optimization model,Combined heat and power (CHP),maximum benefits,dynamic programming
更新于2025-09-19 17:13:59
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[IEEE 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Rome, Italy (2019.6.17-2019.6.20)] 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Design of a Broadband Omnidirectional Metasurface Antenna Using Characteristic Mode Analysis
摘要： Analyses have shown that electric vehicle (EV) loads may considerably affect the secondary service voltage quality. One of the ways to mitigate voltage drop concerns is to use a time-of-use (TOU) pricing scheme. A TOU pricing scheme utilizes the off-peak generation for EV charging, thus deferring any immediate grid upgrade and improving the grid sustainability. This paper evaluates various aspects of EV charging under a TOU schedule, with off-peak rates starting at hours ranging from 8 P.M. to 3 A.M. The study is conducted using an actual residential distribution circuit. A best practical time to begin the off-peak rates is determined so that the effects of EV charging on the secondary service voltages are minimized while ensuring that EVs are fully charged by 7 A.M., thus maximizing both grid and customer benefits. The analysis suggests that the best time to begin off-peak rates is between 11 P.M. and 12 A.M. Furthermore, the analysis also suggests that setting up TOU off-peak rates at the latter half of the peak load demand, for example, at 8 P.M., is detrimental to the distribution circuit voltage quality. The result indicates that the existing utility TOU scheme may exacerbate voltage drop problems due to EV load charging.
关键词： Distribution system,time-of-use (TOU) pricing,electricity market,electric vehicle (EV)
更新于2025-09-19 17:13:59
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[IEEE 2019 Compound Semiconductor Week (CSW) - Nara, Japan (2019.5.19-2019.5.23)] 2019 Compound Semiconductor Week (CSW) - Coherent control of a GaAs quantum dot spin qubit operated in a feedback loop
摘要： The combined heat and power (CHP) systems can provide heat and electricity simultaneously. They are promising in the future energy landscape because of high efficiency and low emissions. This paper proposes a new operation optimization model of CHPs in deregulated energy markets. Both CHPs’ overall efficiency and heat to electricity ratio are closely linked with the loading level, which are dynamically determined in this paper. A discrete optimization model is then proposed to determine the optimal real-time operation strategies for the CHPs. The optimization problem is solved by the interior point method with discrete time intervals, in which the discrete optimal operation points can be identified effectively. This step projects the potential operation strategies that could produce maximum benefits. Finally, a dynamic programming algorithm is developed to maximize the profits of CHPs through dynamically modifying the operation strategies projected in the previous step considering transient constraints. The proposed new methodology is demonstrated on a 1-MW CHP system with real-time data.
关键词： heat to electricity (H2E) ratio,operation optimization model,Combined heat and power (CHP),maximum benefits,dynamic programming
更新于2025-09-19 17:13:59
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[IEEE 2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS) - Denpasar, Bali, Indonesia (2019.10.1-2019.10.4)] 2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS) - Integrated Energy and Economic Model for Rooftop Photovoltaics on Distribution System
摘要： The penetration of rooftop photovoltaics (PVs) in residential sector has a significant impact to the distribution system. The impact is not only on the technical sides but also on the economic sides. This study proposes Integrated Energy and Economic Model (IEEM) which integrates electricity generation, load profiles, economic assumptions and electricity regulation. It is developed by employing econometric spreadsheet program. IEEM investigates the effect of the PVs on the national electricity cost and electricity tariff. Spreadsheet calculation is used to determine the PVs energy production in Jakarta distribution system. Load profiles is obtained through data of residential customers in Jakarta distribution system. Both economic assumptions and electricity regulation are outlined based on Indonesian Government regulation. From the technical sides, PVs decreases the usage of distribution transformers to less than 80% of transformers load. The economic sides gives insight that PVs not only decreases the electricity sales and distribution business income, but also makes a long payback period on the distribution network investment. Furthermore, the model calculation results show that the increasing of PVs has an impact on increasing the utility electricity cost, while residential electricity tariffs remained. This study can give a consideration for decision makers in state-owned utility to re-arrange their tariff structure and PVs policies for the feasibility of PVs projects in residential sector. This model can be applicable to any location by changing the generation, load profiles, relevant economic assumptions and electricity regulation.
关键词： electricity cost,residental tariff,distribution system,rooftop photovoltaics
更新于2025-09-19 17:13:59