2021
Cavazzini, Giovanna; Benato, Alberto; Pavesi, Giorgio; Ardizzon, Guido
Techno-economic benefits deriving from optimal scheduling of a Virtual Power Plant: Pumped hydro combined with wind farms Journal Article
In: Journal of Energy Storage, vol. 37, iss. May 2020, pp. 102461, 2021, ISSN: 2352-152X.
Abstract | Links | BibTeX | Tags: Pumped hydro storage, Renewable integration, Virtual Power Plant, Wind, Wind energy, Wind-hydro integration
@article{Cavazzini2021c,
title = {Techno-economic benefits deriving from optimal scheduling of a Virtual Power Plant: Pumped hydro combined with wind farms},
author = {Giovanna Cavazzini and Alberto Benato and Giorgio Pavesi and Guido Ardizzon},
url = {https://www.sciencedirect.com/science/article/pii/S2352152X21002103 https://doi.org/10.1016/j.est.2021.102461},
doi = {10.1016/J.EST.2021.102461},
issn = {2352-152X},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
journal = {Journal of Energy Storage},
volume = {37},
issue = {May 2020},
pages = {102461},
publisher = {Elsevier Ltd},
abstract = {Wind and solar are renewable sources characterized by a great potential but a variable and unpredictable nature. Characteristics that provoke mismatch between power supply and demand which in turns are the source of network control issues. Problems manageable with the installation of large-scale energy storage like Pumped Hydro Energy Storage (PHES). To this purpose, the paper presents a techno-economic analysis for assessing the benefits deriving from the hybridization of a seawater PHES (sPHES) plant with an in-operation wind farm. Plants work as a Virtual Power Plant (VPP) instead of two separate unit. The hybridization aims to avoid the unbalances of the wind farm, having negative impact on both the grid and the wind farm owner itself. The unbalances cause unpredictable deviations from the predicted production and, hence, power production fluctuations faced by the grid with curtailments and/or calls in operation of fossil-fuelled power plants. A VPP techno-economic optimization on a daily bases is performed using the ASD-PSO algorithm while the optimization aim is the revenue maximization. Results show that a VPP composed by a sPHES and a wind farm and with a single owner, is able to manage the wind farm production, improving the revenue of 6.8% compared to plants acting separately on the market. The VPP approach is also convenient in the case of a joint venture between the plants owners. But, in this case, the revenue is increased only of 0.4% compared to plants working separately. Finally, results also highlight that, in the Italian electricity market, a sPHES plant alone is not able to generate sufficient revenue to guarantee a reasonable payback time while coupling it with a wind farm increases incomes and working days and avoid cost and grid issues in managing the unpredictable wind farm production.},
keywords = {Pumped hydro storage, Renewable integration, Virtual Power Plant, Wind, Wind energy, Wind-hydro integration},
pubstate = {published},
tppubtype = {article}
}
Wind and solar are renewable sources characterized by a great potential but a variable and unpredictable nature. Characteristics that provoke mismatch between power supply and demand which in turns are the source of network control issues. Problems manageable with the installation of large-scale energy storage like Pumped Hydro Energy Storage (PHES). To this purpose, the paper presents a techno-economic analysis for assessing the benefits deriving from the hybridization of a seawater PHES (sPHES) plant with an in-operation wind farm. Plants work as a Virtual Power Plant (VPP) instead of two separate unit. The hybridization aims to avoid the unbalances of the wind farm, having negative impact on both the grid and the wind farm owner itself. The unbalances cause unpredictable deviations from the predicted production and, hence, power production fluctuations faced by the grid with curtailments and/or calls in operation of fossil-fuelled power plants. A VPP techno-economic optimization on a daily bases is performed using the ASD-PSO algorithm while the optimization aim is the revenue maximization. Results show that a VPP composed by a sPHES and a wind farm and with a single owner, is able to manage the wind farm production, improving the revenue of 6.8% compared to plants acting separately on the market. The VPP approach is also convenient in the case of a joint venture between the plants owners. But, in this case, the revenue is increased only of 0.4% compared to plants working separately. Finally, results also highlight that, in the Italian electricity market, a sPHES plant alone is not able to generate sufficient revenue to guarantee a reasonable payback time while coupling it with a wind farm increases incomes and working days and avoid cost and grid issues in managing the unpredictable wind farm production.
2017
Miao, Weipao; Li, Chun; Pavesi, Giorgio; Yang, Jun; Xie, Xiaoyun
Investigation of wake characteristics of a yawed HAWT and its impacts on the inline downstream wind turbine using unsteady CFD Journal Article
In: Journal of Wind Engineering and Industrial Aerodynamics, vol. 168, iss. May, pp. 60-71, 2017, ISSN: 01676105.
Abstract | Links | BibTeX | Tags: CFD, Power Output, Wake deviation, Wind, Wind farm, Yaw
@article{Miao2017,
title = {Investigation of wake characteristics of a yawed HAWT and its impacts on the inline downstream wind turbine using unsteady CFD},
author = {Weipao Miao and Chun Li and Giorgio Pavesi and Jun Yang and Xiaoyun Xie},
url = {http://dx.doi.org/10.1016/j.jweia.2017.05.002},
doi = {10.1016/j.jweia.2017.05.002},
issn = {01676105},
year = {2017},
date = {2017-01-01},
urldate = {2017-01-01},
journal = {Journal of Wind Engineering and Industrial Aerodynamics},
volume = {168},
issue = {May},
pages = {60-71},
publisher = {Elsevier Ltd},
abstract = {Unsteady CFD simulations for influences of the yawed wake on the wake trajectory and the downstream wind turbine were carried out using the full rotor model (FRM) of a 5 MW wind turbine, in order to investigate the mechanism of wake deviation. A control strategy based on the yaw angle was adopted to skew the upstream wake trajectory, thereby avoiding the downstream wind turbine and improving the efficiency of whole wind farm power generation. In this paper, the commercial CFD software STAR-CCM+ was used to simulate the wind farm with two tandem wind turbines operating in the neutral atmospheric boundary layer (ABL) condition. The results show that the wind farm's total power increases when the upstream wind turbine applies a positive yaw angle intentionally. According to the analysis of velocity contours, wake centerlines and vortex structures, a counter-rotating blade tip vortex pair is observed to be responsible for the wake deviation effects. It also reveals that the influence of a yawed wake on the downstream wind turbine may be slightly underestimated in some empirical wake model.},
keywords = {CFD, Power Output, Wake deviation, Wind, Wind farm, Yaw},
pubstate = {published},
tppubtype = {article}
}
Unsteady CFD simulations for influences of the yawed wake on the wake trajectory and the downstream wind turbine were carried out using the full rotor model (FRM) of a 5 MW wind turbine, in order to investigate the mechanism of wake deviation. A control strategy based on the yaw angle was adopted to skew the upstream wake trajectory, thereby avoiding the downstream wind turbine and improving the efficiency of whole wind farm power generation. In this paper, the commercial CFD software STAR-CCM+ was used to simulate the wind farm with two tandem wind turbines operating in the neutral atmospheric boundary layer (ABL) condition. The results show that the wind farm's total power increases when the upstream wind turbine applies a positive yaw angle intentionally. According to the analysis of velocity contours, wake centerlines and vortex structures, a counter-rotating blade tip vortex pair is observed to be responsible for the wake deviation effects. It also reveals that the influence of a yawed wake on the downstream wind turbine may be slightly underestimated in some empirical wake model.
2012
Bianchi, Nicola; Bolognani, Silverio; Fornasiero, Emanuele; Morandin, Mattia; Pavesi, Giorgio
Optimal drive and machine sizing for a self starting, vertical axis, low power wind generator Proceedings Article
In: 2012 IEEE International Energy Conference and Exhibition, ENERGYCON 2012, pp. 178-183, ieeexplore.ieee.org, 2012, ISBN: 9781467314541.
Abstract | Links | BibTeX | Tags: Darrieus, VAWT, Wind, Wind Turbine
@inproceedings{pop00023,
title = {Optimal drive and machine sizing for a self starting, vertical axis, low power wind generator},
author = {Nicola Bianchi and Silverio Bolognani and Emanuele Fornasiero and Mattia Morandin and Giorgio Pavesi},
url = {http://ieeexplore.ieee.org/document/6347747/ http://ieeexplore.ieee.org/abstract/document/6347747/},
doi = {10.1109/EnergyCon.2012.6347747},
isbn = {9781467314541},
year = {2012},
date = {2012-01-01},
urldate = {2012-01-01},
booktitle = {2012 IEEE International Energy Conference and Exhibition, ENERGYCON 2012},
pages = {178-183},
publisher = {ieeexplore.ieee.org},
abstract = {This paper presents a comparison of different design choices in small wind power systems design. A vertical axis wind turbine is considered,to take advantage of the fact that it is omni–directional, i.e. it can accept wind from any direc- tion. The vertical axis turbine that has been used is a type of straight–bladed Darrieus turbine coupled with a Savonius turbine, in order to built a self starting turbine. To chose the electric generator with its drive, an economic analysis is carried out on the basis of generator, power converter and me- chanical system costs. The optimal ratings are found on the basis of the maximum profit over payback time. An Interior Permanent Magnet (IPM) generator and a Surface Permanent Magnet (SPM) generator are compared. The IPM generator can be driven in the flux weakening region, exploiting higher turbine rotation speeds. The paper shows that economic ad- vantages are obtained using an IPM generator, optimized together with the power converter. 1.},
keywords = {Darrieus, VAWT, Wind, Wind Turbine},
pubstate = {published},
tppubtype = {inproceedings}
}
This paper presents a comparison of different design choices in small wind power systems design. A vertical axis wind turbine is considered,to take advantage of the fact that it is omni–directional, i.e. it can accept wind from any direc- tion. The vertical axis turbine that has been used is a type of straight–bladed Darrieus turbine coupled with a Savonius turbine, in order to built a self starting turbine. To chose the electric generator with its drive, an economic analysis is carried out on the basis of generator, power converter and me- chanical system costs. The optimal ratings are found on the basis of the maximum profit over payback time. An Interior Permanent Magnet (IPM) generator and a Surface Permanent Magnet (SPM) generator are compared. The IPM generator can be driven in the flux weakening region, exploiting higher turbine rotation speeds. The paper shows that economic ad- vantages are obtained using an IPM generator, optimized together with the power converter. 1.
