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Power fluctuation and power loss of wind turbines due to wind shear and tower shadow

Binrong WEN, Sha WEI, Kexiang WEI, Wenxian YANG, Zhike PENG, Fulei CHU

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3,   Pages 321-332 doi: 10.1007/s11465-017-0434-1

Abstract:

The magnitude and stability of power output are two key indices of wind turbines.This study investigates the effects of wind shear and tower shadow on power output in terms of powerfluctuation and power loss to estimate the capacity and quality of the power generated by a wind turbinePower fluctuation and power loss due to wind shear and tower shadow are analyzed by performing theoreticalResults indicate that power fluctuation is mainly caused by tower shadow, whereas power loss is primarily

Keywords： wind turbine     wind shear     tower shadow     power fluctuation     power loss    

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A novel light fluctuation spectrum method for in-line particle sizing

Shouxuan QIN, Xiaoshu CAI, Li MA

Frontiers in Energy 2012, Volume 6, Issue 1,   Pages 89-97 doi: 10.1007/s11708-012-0176-z

Abstract: This paper discusses two problems in in-line particle sizing when using light fluctuation method.

Keywords： measurement     particle size distribution (PSD)     incident light intensity     particle concentration     light fluctuation    

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Anti-erosion elastic coating design based on synchronous fluctuation principle

Guo Yuanjun,Xiao Hualin,Xu Daqing,Li Wenbin

Strategic Study of CAE 2008, Volume 10, Issue 9,   Pages 60-63

Abstract: The condition of realized synchronous fluctuation of elastic coating channel border with the perturbation

Keywords： erosion     boundary layer     elastic channel border     elastic coating     synchronous fluctuation    

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Optimal portfolio design of energy storage devices with financial and physical right market

Frontiers in Energy 2022, Volume 16, Issue 1,   Pages 95-104 doi: 10.1007/s11708-021-0788-2

Abstract: With the continuous development of the spot market, in the multi-stage power market environment withportfolio of energy storage devices requires that attention should be paid to transmission congestion and powerTo maximize the profit of energy storage and avoid the imbalance of power supply and consumption andthe risk of node price fluctuation caused by transmission congestion, this paper presents a portfolioportfolio models are verified through the test data of the Pennsylvania-New Jersey-Maryland (PJM) electric power

Keywords： portfolio     node price fluctuation     transmission right     energy storage right     risk aversion    

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Numerical simulation and analysis of periodically oscillating pressure characteristics of inviscid flow in a rolling pipe

Yan GU, Yonglin JU

Frontiers in Energy 2012, Volume 6, Issue 1,   Pages 21-28 doi: 10.1007/s11708-012-0173-2

Abstract: It is found that the pressure fluctuation of the inviscid flow remains almost constant at different flowThe amplitude of the pressure fluctuation increases with the increasing of the excitated amplitude, andIt is also found that the period of the pressure fluctuation varies with the excitated frequency.

Keywords： pressure fluctuation     rolling     floating production storage and offloading unit for liquefied natural gas    

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A novel high-temperature and high-pressure hydraulic pump based on mononeuron control

Linhui ZHAO, Xin FANG

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 2,   Pages 219-223 doi: 10.1007/s11465-009-0024-y

Abstract: Based on structures and characteristics of traditional hydraulic pumps, this paper proposes a novel high-temperature and high-pressure hydraulic pump (HHHP) that can work under 150°C and 28 MPa to overcome problems of traditional high-temperature plunger pumps. The HHHP is designed with the structure of mechanical division and double cylinder parallel. The control signals of two cylinders are two separate triangle waveforms with 90° phase difference. Because the output waveforms of two cylinders have the same characteristics as the control signals, the HHHP can obtain a stable output after two separate waveforms are superposed. A mononeuron self-adaptive PID control algorithm is also improved by modifying parameters and . Two improved controllers are used to control the two cylinders, respectively, making two displacements of plungers match each other. Therefore, reduced fluctuations and stable pressure output is obtained. Besides simulation, tests on the built prototype test system are carried out to verify the performance of HHHP. Results show that the improved control approach can limit fluctuations to a lower level and the HHHP system attains good outputs under different signal periods and different pressures.

Keywords： mononeuron PID control     hydraulic pump     pressure fluctuation    

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Distribution, characteristics and daily fluctuations of microplastics throughout wastewater treatment plants with mixed domestic–industrial influents in Wuxi City, China

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 1,   Pages 6-6 doi: 10.1007/s11783-021-1440-4

Abstract:

• MPs were analyzed throughout three WWTPs with mixed domestic–industrial influents.

Keywords： Microplastic     Wastewater treatment plant     Mixed domestic-industrial influent     Characteristic     Daily fluctuation    

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Removal of pharmaceutical and personal care products by sequential ultraviolet and ozonation process in a full-scale wastewater treatment plant

Qian SUI, Jun HUANG, Shuguang LU, Shubo DENG, Bin WANG, Wentao ZHAO, Zhaofu QIU, Gang YU

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 1,   Pages 62-68 doi: 10.1007/s11783-013-0518-z

Abstract: Noticeable fluctuation in the removal efficiencies of the same PPCPs was observed in different sampling

Keywords： PPCPs     advanced treatment     ozone     fluctuation     removal contribution    

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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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Numerical simulation of sudden-expansion two-phase flows with two-scale second-order moment particle turbulence model

ZENG Zhuoxiong, HAN Shoulei, ZHOU Lixing

Frontiers in Energy 2007, Volume 1, Issue 2,   Pages 202-206 doi: 10.1007/s11708-007-0026-6

Abstract: second-order moment particle turbulence model is developed, based on the concept of particle large-scale fluctuationdue to turbulence and particle small-scale fluctuation due to collision.

Keywords： gas-particle     single-scale second-order     large-scale fluctuation     second-order     sudden-expansion    

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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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Title Author Date Type Operation

Power fluctuation and power loss of wind turbines due to wind shear and tower shadow

Binrong WEN, Sha WEI, Kexiang WEI, Wenxian YANG, Zhike PENG, Fulei CHU

Journal Article

A novel light fluctuation spectrum method for in-line particle sizing

Shouxuan QIN, Xiaoshu CAI, Li MA

Journal Article

Anti-erosion elastic coating design based on synchronous fluctuation principle

Guo Yuanjun,Xiao Hualin,Xu Daqing,Li Wenbin

Journal Article

Optimal portfolio design of energy storage devices with financial and physical right market

Journal Article

Numerical simulation and analysis of periodically oscillating pressure characteristics of inviscid flow in a rolling pipe

Yan GU, Yonglin JU

Journal Article

A novel high-temperature and high-pressure hydraulic pump based on mononeuron control

Linhui ZHAO, Xin FANG

Journal Article

Distribution, characteristics and daily fluctuations of microplastics throughout wastewater treatment plants with mixed domestic–industrial influents in Wuxi City, China

Journal Article

Removal of pharmaceutical and personal care products by sequential ultraviolet and ozonation process in a full-scale wastewater treatment plant

Qian SUI, Jun HUANG, Shuguang LU, Shubo DENG, Bin WANG, Wentao ZHAO, Zhaofu QIU, Gang YU

Journal Article

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

Shenghu LI, Ting WANG

Journal Article

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

Mark KUPRAT, Martin BENDIG, Klaus PFEIFFER

Journal Article

Numerical simulation of sudden-expansion two-phase flows with two-scale second-order moment particle turbulence model

ZENG Zhuoxiong, HAN Shoulei, ZHOU Lixing

Journal Article

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

Yang YANG, Jing LIU,

Journal Article

Renewable power for China: Past, present, and future

Eric MARTINOT

Journal Article

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

Journal Article

Strategy of Manufacturing Quality Power

The Research Group for Manufacturing Quality Power Strategy

Journal Article