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Impact of renewable energies on the operation and economic situation of coal fired power stations: Actualsituation of coal fired power stations in Germany

Hans-Joachim KRAUTZ, Alexander LISK, Joachim POSSELT, Christian KATZER

Frontiers in Energy 2017, Volume 11, Issue 2, Pages 119-125 doi: 10.1007/s11708-017-0468-4

Abstract: Due to the fluctuating character of the renewable energy sources the demand of conventional power plantsThe increased need for flexibility affects both the power gradients as well as the minimum load of conventionalpower plants.of renewable energies is the decreasing full load operating hours, especially of coal fired and gas powerAlong with decreasing revenues from the energy exchange market, coal fired power plants are faced with

Keywords： flexible load operation minimal load power gradients power plant maintenance corrosion life expectancy

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Diffusive gradients in thin films using molecularly imprinted polymer binding gels for in situ measurements

Ying Cui, Feng Tan, Yan Wang, Suyu Ren, Jingwen Chen

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 6, doi: 10.1007/s11783-020-1290-5

Abstract: Abstract • Selective molecularly imprinted polymer (MIP) binding gel was prepared. • MIP-DGT showed excellent uptake performance for antibiotics. • In situ measurement of antibiotics in wastewaters via MIP-DGT was developed. • The MIP-DGT method was robust, reliable, and highly sensitive. Urban wastewater is one of main sources for the introduction of antibiotics into the environment. Monitoring the concentrations of antibiotics in wastewater is necessary for estimating the amount of antibiotics discharged into the environment through urban wastewater treatment systems. In this study, we report a novel diffusive gradient in thin films (DGT) method based on molecularly imprinted polymers (MIPs) for in situ measurement of two typical antibiotics, fluoroquinolones (FQs) and sulfonamides (SAs) in urban wastewater. MIPs show specific adsorption toward their templates and their structural analogs, resulting in the selective uptake of the two target antibiotics during MIP-DGT deployment. The uptake performance of the MIP-DGTs was evaluated in the laboratory and was relatively independent of solution pH (4.0–9.0), ionic strength (1–750 mmol/L), and dissolved organic matter (DOM, 0–20 mg/L). MIP-DGT samplers were tested in the effluent of an urban wastewater treatment plant for field trials, where three SA (sulfamethoxazole, sulfapyridine, and trimethoprim) and one FQ (ofloxacin) antibiotics were detected, with concentrations ranging from 25.50 to 117.58 ng/L, which are consistent with the results measured by grab sampling. The total removal efficiency of the antibiotics was 80.1% by the treatment plant. This study demonstrates that MIP-DGT is an effective tool for in situ monitoring of trace antibiotics in complex urban wastewaters.

Keywords： Diffusive gradients in thin films Molecularly imprinted polymers Selective uptake Antibiotics Passive

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Effect of anisotropic characteristics on the mechanical behavior of asphalt concrete overlay

Lingyun YOU, Zhanping YOU, Kezhen YAN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1, Pages 110-122 doi: 10.1007/s11709-018-0476-4

Abstract: Asphalt concrete (AC) overlays placed over old asphalt pavement have become an alternative to repairing and reinforcing pavements. The strength contributed by the AC overlay is strongly influenced by the anisotropic properties of the pavement material. This study was conducted to analyze the influence of anisotropy, modulus gradient properties, and the condition of the AC overlay and old pavement contact plane on the mechanical behaviors of AC overlays, as well as to quantify the influence of the degree of anisotropy on the mechanical behaviors of AC overlay by a sensitivity analysis (SA). The mechanical behaviors of the AC overlay were numerically obtained using the three-dimensional finite element method with the aid of ABAQUS a commercial program. Variations in the AC overlay’s modulus as a function of temperature as well as the contact state between the AC overlay and AC layer were considered. The SA is based on standardized regression coefficients method. Comparing the mechanical behavior in terms of surface deflection, stress, and strain of the anisotropy model against those corresponding to the isotropic model under static loads show that the anisotropic properties had greater effects on the mechanical behavior of the AC overlay. In addition, the maximum shear stress in the AC overlay was the most significant output parameter affected by the degree of anisotropy. Therefore, future research concerning the reinforcement and repair of pavements should consider the anisotropic properties of the pavement materials.

Keywords： asphalt concrete overlay anisotropy temperature gradients modulus gradients finite element simulation

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Analysis of Coherent Structures in a Turbulent Boundary Layer With Pressure Gradients

Lu Lipeng,Li Zhaorui

Strategic Study of CAE 2002, Volume 4, Issue 11, Pages 50-56

Abstract: structures in the wall region of a turbulent boundary layer with either steady or changing pressure gradientsPressure gradients have much more effect on choosing preliminary waves than on evaluating of the coherent

Keywords： coherent structures turbulent boundary layer pressure gradients direct numerical simulation (DNS)

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The Ejection and Sweep in the Wall Region of a Turbulent Boundary Layer Under Adverse Pressure Gradient

Zhang Qiang,Lu Lipeng

Strategic Study of CAE 2003, Volume 5, Issue 11, Pages 47-50

Abstract: evolution of coherent structures in the wall region of a turbulent boundary layer under adverse pressure gradients

Keywords： coherent structures turbulent boundary layer adverse pressure gradients direct numerical simulation

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UPFC setting to avoid active power flow loop considering wind power uncertainty

Shenghu LI, Ting WANG

Frontiers in Energy 2023, Volume 17, Issue 1, Pages 165-175 doi: 10.1007/s11708-020-0686-z

Abstract: The active power loop flow (APLF) may be caused by impropriate network configuration, impropriate parameterThe power flow controllers, e.g., the unified power flow controller (UPFC), may be the reason and theapproaching to the critical existing condition, the integrated power flow needs less iterations andBesides, with wind power fluctuation, the interval power flow (IPF) is introduced into the integratedpower flow, and solved with the affine Krawcyzk iteration to make sure that the range of active power

Keywords： active power loop flow (APLF) unified power flow controller (UPFC) wind power uncertainty interval power

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Possible role of power-to-heat and power-to-gas as flexible loads in German medium voltage networks

Mark KUPRAT, Martin BENDIG, Klaus PFEIFFER

Frontiers in Energy 2017, Volume 11, Issue 2, Pages 135-145 doi: 10.1007/s11708-017-0472-8

Abstract: As an option to cope with those problems, the technologies of power-to-gas (PtG) and power-to-heat (PtH, the network-supporting abilities and the potential to provide ancillary services, such as control power

Keywords： power-to-gas power-to-heat flexible loads ancillary services coherent energy systems

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Evaluation of the power-generation capacity of wearable thermoelectric power generator

Yang YANG, Jing LIU,

Frontiers in Energy 2010, Volume 4, Issue 3, Pages 346-357 doi: 10.1007/s11708-010-0112-z

Abstract: heat dissipating from the human body through the skin surface is a promising way to supply electronic powerthe temperature difference between the environment and the human body, and complete elimination of power

Keywords： thermal energy harvester thermoelectric generator biological heat transfer power generating capacity

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Renewable power for China: Past, present, and future

Eric MARTINOT

Frontiers in Energy 2010, Volume 4, Issue 3, Pages 287-294 doi: 10.1007/s11708-010-0120-z

Abstract: examines the history, status, policy situation, development issues, and prospects for key renewable powerglobal leader in wind turbine and solar photovoltaic (PV) production, and leads the world in total powerexperience and performance, transmission constraints, grid interconnection time lags, resource assessments, powerProspects for biomass power are limited by resource constraints.Other technologies such as concentrating solar thermal power, ocean energy, and electricity storage require

Keywords： renewable energy wind power solar power sustainable energy policy green industry

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Carbon emission impact on the operation of virtual power plant with combined heat and power system

Yu-hang XIA,Jun-yong LIU,Zheng-wen HUANG,Xu ZHANG

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 5, Pages 479-488 doi: 10.1631/FITEE.1500467

Abstract: A virtual power plant (VPP) can realize the aggregation of distributed generation in a certain region, and represent distributed generation to participate in the power market of the main grid.This paper proposes the allocation of an electric boiler to realize wind power directly converted forsupplying heat, which can not only overcome the limitation of heat output from a combined heat and powerThe power output of each unit in the case study is analyzed under four scenarios.

Keywords： Virtual power plant (VPP) Carbon emissions Electric boiler Wind power Combined heat and power (CHP

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Strategy of Manufacturing Quality Power

The Research Group for Manufacturing Quality Power Strategy

Strategic Study of CAE 2015, Volume 17, Issue 7, Pages 24-28

Abstract:

The meaning to implement the Manufacturing Quality Power Strategy was systematically discussed in

Keywords： manufacturing power quality strategy

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Will Germany move into a situation with unsecured power supply?

Harald SCHWARZ

Frontiers in Energy 2019, Volume 13, Issue 3, Pages 551-570 doi: 10.1007/s11708-019-0641-z

Abstract: increasing traffic, CO emissions from this mobility sector increased and CO emission from German powercalled “The German Coal Commission”) to propose a time line: how Germany can move out of coal-fired powermade: ① Until 2022: Due to a former decision of the German Government, the actual remaining nuclear powerplants should be switched off. ③ Until 2038: The final 17 GW of German hard coal or lignite-fired powerCoal Commission” has not investigated the relevant technical parameter to ensure a secured electric power

Keywords： CO₂ reduction mobility sector renewable generation coal commission secured power generationcapacity reliable power supply power-to-gas power-to-heat

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A comprehensive review of wind power based power system frequency regulation

Frontiers in Energy 2023, Volume 17, Issue 5, Pages 611-634 doi: 10.1007/s11708-023-0876-6

Abstract: Wind power (WP) is considered as one of the main renewable energy sources (RESs) for future low-carbonand high-cost-efficient power system.However, its low inertia characteristic may threaten the system frequency stability of the power systemIn this paper, the impact of WP on power system frequency stability is initially presented.Furthermore, the prospects, future challenges, and solutions of WP participating in power system frequency

Keywords： frequency regulation strategies wind turbine generators grid-forming control model predictive control energy storage system

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Optimal operation of integrated energy system including power thermal and gas subsystems

Frontiers in Energy 2022, Volume 16, Issue 1, Pages 105-120 doi: 10.1007/s11708-022-0814-z

Abstract: hybrid multi-energy systems, the integrated energy system contains different forms of energy such as powerthe integrated energy system, in this paper, the dist-flow method is applied to quickly calculate the powerflow and the gas system model is built by the analogy of the power system model.The power-thermal-gas integrated energy system used in the case study includes an IEEE-33 bus power systemSimulation-based calculations and comparison of the results under different scenarios prove that the power-thermal-gas

Keywords： integrated energy system power-to-gas dist-flow piecewise linearization alternating direction method

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A New Way to Evaluate Extensive Marketing Power

Xu Lijuan

Strategic Study of CAE 2006, Volume 8, Issue 6, Pages 100-102

Abstract:

The extensive marketing power is the ability of obtaining the consumers' approval during the courseThis paper puts forward a new method to evaluate this important power, so as to make a relatively scientificway to help raising enterprise's influencing power in market.

Keywords： marketing power extensive marketing power influencing power in market index of extensive marketing power

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Title Author Date Type Operation

Impact of renewable energies on the operation and economic situation of coal fired power stations: Actualsituation of coal fired power stations in Germany

Hans-Joachim KRAUTZ, Alexander LISK, Joachim POSSELT, Christian KATZER

Journal Article

Diffusive gradients in thin films using molecularly imprinted polymer binding gels for in situ measurements

Ying Cui, Feng Tan, Yan Wang, Suyu Ren, Jingwen Chen

Journal Article

Effect of anisotropic characteristics on the mechanical behavior of asphalt concrete overlay

Lingyun YOU, Zhanping YOU, Kezhen YAN

Journal Article

Analysis of Coherent Structures in a Turbulent Boundary Layer With Pressure Gradients

Lu Lipeng,Li Zhaorui

Journal Article

The Ejection and Sweep in the Wall Region of a Turbulent Boundary Layer Under Adverse Pressure Gradient