The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Sheng Siqin - One of the best experts on this subject based on the ideXlab platform.
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An Economic Dispatching Strategy of Peak Load Shifting by Wind Farm and Pumped Storage Plant
Power system technology, 2014Co-Authors: Sheng SiqinAbstract:Power output of wind farm possesses both properties of fluctuation and counter-peak load regulation, therefore grid-connection of large-scale wind power enlarges the peak-to-valley difference of load indirectly and makes frequent start/stop of thermal generating units, thus the operational cost of power grid increases. Due to its excellent energy Storage capability and outstanding dispatching flexibility, the pumped Storage Plant is often used for peak load shaving. Combining the wind farm with the pumped Storage Plant, a scheduling strategy based on the combination of the wind farm with the pumped Storage Plant is proposed. Utilizing the energy Storage capability of the pumped Storage Plant the power output of the wind farm during the peak load period is transferred to the pumped Storage Plant to retain water, thus the stored wind power output, which disorderly fluctuates originally, can be used for peak load shaving. A multi-objective scheduling model of power grid containing the wind farm and the pumped Storage Plant, in which the minimum operational cost of thermal power generation units, the minimum variance of net load and the maximum power output of combined wind farms and pumped Storage Plants are taken as objectives, is established. Because the maximized power output of the combined wind farms with pumped Storage Plants that is regarded as one of the objectives of the established model, not only the coal cost for thermal power Plants can be reduced, but also the waste due to wind power curtailment can be avoided, besides, the superiority of wind farm and pumped Storage Plant in environment protection can be brought into full play. The feasibility and effectiveness of the proposed model are validated by case study.
Narayana Prasad Padhy - One of the best experts on this subject based on the ideXlab platform.
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variable speed operation of reversible pump turbines at kadamparai pumped Storage Plant a case study
Energy Conversion and Management, 2014Co-Authors: N Sivakumar, Narayana Prasad PadhyAbstract:Abstract While carrying out renovation and modernization, introducing new technologies for improving the power station performance is a universal practice. In this context a study has been conducted for the 26 year-old Kadamparai pumped Storage Plant (4 × 100 MW) located in the state of Tamil Nadu, India, with the objective of adopting variable speed technology while undertaking renovation & modernization in not-so distant future. Present peak power demand and the expected capacity addition through thermal, nuclear, solar, wind energy power Plants to the state grid needs a review on the existing operation of Kadamparai pumped Storage Plant to meet out the peak and energy shortage of the state. The existing conventional synchronous machines of this Plant can be operated as variable speed machines by adopting static frequency converters (SFC) between stator and grid supply or replacement of existing synchronous machines with variable speed induction generators to utilize the grid load variation effectively. Annual operation of Kadamparai pumped Storage scheme with variable speed machines has been analyzed in the existing hydraulic conditions. Additional benefits that is likely to accrue as compared to conventional synchronous speed operation has been calculated. Results show that the variable speed technology has considerably increased the Plant performance.
D N Orange - One of the best experts on this subject based on the ideXlab platform.
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following practices soil water Storage Plant available soil nitrogen accumulation and wheat performance in south west queensland
Soil & Tillage Research, 1992Co-Authors: B J Radford, G Gibson, R G H Nielsen, D G Butler, G D Smith, D N OrangeAbstract:Radford, B.J., Gibson, G., Nielsen, R.G.H., Butler, D.G., Smith, G.D. and Orange, D.N., 1992. Fallowing practices, soil water Storage, Plant-available soil nitrogen accumulation and wheat performance in South West Queensland. Soil Tillage Res., 22: 73-93. The effects of tillage frequency (conventional, reduced and zero), primary tillage implement (disc, blade and chisel plough), stubble management (retention and removal), gypsum application and paraplowing were examined with respect to soil water Storage, soil nitrate accumulation, seedling establishment, crop growth, yield and grain protein content for four successive years of wheat, grown on a sodic, duplex soil in South West Queensland, Australia. Stubble retention generally resulted in more soil water at sowing but less at harvest, compared with stubble removal. This led to higher grain yields in dry growing seasons and has implications for reducing runoff. Zero tillage with stubble removal had the lowest mean water Storage and, in dry growing seasons, the lowest grain yield. This indicates that when stubble is absent or lacking, some tillage is needed, probably to break surface seals and increase surface roughness. Zero tillage with stubble retention accumulated the most soil water but the least soil nitrate. Consequently this treatment outyielded all others in the driest growing season but was outyielded by almost all others in the wettest. Increased frequency and aggressiveness of tillage, and stubble removal, increased the amount of soil NO3-N at 0-60 cm. There were no significant (P< 0.05 ) tillage × stubble interactions. In the wettest growing season, wheat grain yields reflected the different levels of NO3-N in the soil. In the other three years, grain protein contents reflected these levels. Both zero tillage and stubble retention reduced the efficiency of water use, probably because both also reduced nitrogen supply. So despite high yields from zero tillage with stubble retention in the dry growing seasons, the full yield potential of this treatment with respect to its water supply was not realized. Gypsum application at 5 t ha- t had no commercially useful effect on establishment or grain yield and is not recommended. Similarly, paraplowing had no effect on yield. Reduced or zero tillage is recommended, provided that stubble is present and nitrogen supply is adequate.
Eamon Mckeogh - One of the best experts on this subject based on the ideXlab platform.
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techno economic review of existing and new pumped hydro energy Storage Plant
Renewable & Sustainable Energy Reviews, 2010Co-Authors: J P Deane, Brian O Gallachoir, Eamon MckeoghAbstract:Abstract There has been a renewed commercial and technical interest in pumped hydro energy Storage (PHES) recently with the advent of increased variable renewable energy generation and the development of liberalized electricity markets. During the next 8 years over 7 GW of PHES capacity will be added to the European network while projects are also planned in the USA and Japan. This paper provides a review of existing and proposed PHES Plant and discusses the technical and economic drivers for these developments. Current trends for new PHES development generally show that developers operating in liberalized markets are tending to repower, enhance projects or build ‘pump-back’ PHES rather than traditional ‘pure pumped Storage’. Capital costs per kW for proposed PHES in the review region range between €470/kW and €2170/kW, however these costs are highly site and project specific. An emergence has also been observed in recent PHES developments of the use of variable speed technology. This technology, while incurring slightly higher capital costs, offers a greater range of operational flexibility and efficiency over conventional PHES. This paper has primarily been prompted by a lack of detailed information on PHES facilities worldwide and reviews current developments in the context of market and generation mix changes. The most recent large scale review of PHES faculties was undertaken by the American Society of Civil Engineers Hydro Power Task Committee on Pumped Storage in 1996. In the absence of data in the literature on new PHES Plant development, this review draws primarily on publicly available information from utilities, government bodies and electricity regulators. In the same context this study is limited to a review region of the European Union, Japan and the United States as information on developments outside these areas is difficult to procure. This paper also gives a review of locations and proposed timelines for new PHES development and provides a thorough up-to-date overview of the development trends of this technology.
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techno economic review of existing and new pumped hydro energy Storage Plant
Renewable & Sustainable Energy Reviews, 2010Co-Authors: J P Deane, Brian O Gallachoir, Eamon MckeoghAbstract:There has been a renewed commercial and technical interest in pumped hydro energy Storage (PHES) recently with the advent of increased variable renewable energy generation and the development of liberalized electricity markets. During the next 8 years over 7Â GW of PHES capacity will be added to the European network while projects are also planned in the USA and Japan. This paper provides a review of existing and proposed PHES Plant and discusses the technical and economic drivers for these developments. Current trends for new PHES development generally show that developers operating in liberalized markets are tending to repower, enhance projects or build 'pump-back' PHES rather than traditional 'pure pumped Storage'. Capital costs per kW for proposed PHES in the review region range between [euro]470/kW and [euro]2170/kW, however these costs are highly site and project specific. An emergence has also been observed in recent PHES developments of the use of variable speed technology. This technology, while incurring slightly higher capital costs, offers a greater range of operational flexibility and efficiency over conventional PHES. This paper has primarily been prompted by a lack of detailed information on PHES facilities worldwide and reviews current developments in the context of market and generation mix changes. The most recent large scale review of PHES faculties was undertaken by the American Society of Civil Engineers Hydro Power Task Committee on Pumped Storage in 1996. In the absence of data in the literature on new PHES Plant development, this review draws primarily on publicly available information from utilities, government bodies and electricity regulators. In the same context this study is limited to a review region of the European Union, Japan and the United States as information on developments outside these areas is difficult to procure. This paper also gives a review of locations and proposed timelines for new PHES development and provides a thorough up-to-date overview of the development trends of this technology.
Yonghua Song - One of the best experts on this subject based on the ideXlab platform.
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stochastic optimization of the daily operation of wind farm and pumped hydro Storage Plant
Renewable Energy, 2012Co-Authors: Huajie Ding, Yonghua SongAbstract:Abstract This paper proposes a new coordination operation mode of wind farm (WF) and pumped-hydro-Storage Plant (PHSP) based on day-ahead wind power output forecasts. Firstly, a deterministic mixed integer programming (MIP) formulation is built considering the constraints of unit total startup and shutdown frequencies, as well as unit state exclusion between pumping and generating. Secondly, the paper presents the chance-constrained and scenario-based optimization formulations to deal with errors of wind power forecast. These two formulations target on maximizing the expected profit of joint operation of WF and PHSP. Case studies and sensitivity analyses are conducted, which demonstrate that the coordination of WF and PHSP can greatly alleviate the negative effect of wind power fluctuations on power grid and also increase remarkable profit.
