Value of wind power – Implications from specific power

Johansson, Viktor; Thorson, Ludwig; Goop, Joel; Göransson, Lisa; Odenberger, Mikael; Reichenberg, Lina; Taljegård, Maria; Johnsson, Filip

doi:10.1016/j.energy.2017.03.038

Cited by 45 publications

(25 citation statements)

References 5 publications

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“…Perhaps the most interesting result from repowering is the evolution of specific power, the ratio of power rating to swept area. This is because the profile value, which measures how valuable a wind turbine generation profile is to the electricity system, increases in line with a reduction in specific power . All other elements being equal, a reduction in specific power results in higher capacity factor.…”

Section: Resultsmentioning

confidence: 99%

“…This is because the profile value, which measures how valuable a wind turbine generation profile is to the electricity system, increases in line with a reduction in specific power. 39 All other elements being equal, a reduction in specific power results in higher capacity factor. At the beginning and throughout the first wave, new turbines had significantly higher specific power than the old turbines they replaced; 434 vs 344 W/m 2 in Denmark (Figure 7).…”

Section: Specific Powermentioning

confidence: 99%

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Technology effects in repowering wind turbines

2019

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This research investigates, analyses, and quantifies the technological effects of wind turbine repowering (ie, where old turbines are removed and new turbines are installed at the same or a very close location, including the enhanced performance in energy production). In these cases, it is assumed that both old and new turbines are subject to the same wind regime, other than because of technological elements, such as hub height, and thus it is possible to isolate the effects of new technology from the effect of changing local wind conditions. This research is based on the analysis of empirical data on repowering turbines in Denmark and Germany, and on historical production data available for the Danish component of the data set. Technological innovations are expected to enable new wind turbines to capture more energy at the repowering site, mostly through larger rotors and higher hub heights, and this is what this study has analysed. The results show that new turbines in repowering projects are twice as high, have three times the rotor diameter, nine times the swept area, six times the nominal power, and nine times as much electricity as the old turbines. However, the most significant improvement is probably the increase of capacity factor of 7.1% on a per-turbine basis, or 9.7% on a per-production basis.

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Section: Resultsmentioning

confidence: 99%

Section: Specific Powermentioning

confidence: 99%

Technology effects in repowering wind turbines

2019

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“…The know advantages of system-friendly layouts regarding the feed-in of vRES are of increasing relevance especially for power systems with low flexibility and already high vRES shares where their potential to improve the integration of vRES power sources is higher as outlined by [22]. However, for power systems with lower shares of renewables or significant flexibility options, like pump hydro storage capacities, slightly higher LCOE from system-friendly might offset the specific advantages of system-friendly renewables [22][23][24].…”

Section: Step 1: Scenario Framework and Variable Renewable Energy Optmentioning

confidence: 99%

Interaction of Electrical Energy Storage, Flexible Bioenergy Plants and System-friendly Renewables in Wind- or Solar PV-dominated Regions

et al. 2020

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Wind and solar PV have become the lowest-cost alternatives for power generation in many countries and are expected to dominate the renewable power supply in many regions of the world. The temporal volatility in power production from these sources leads to new challenges for a stable and secure power supply system. Possible technologies to improve the integration of wind and solar PV are electrical energy storage and the flexible power provision by bioenergy. A third option is the system-friendly layout of wind and solar PV systems and the optimized mix of wind and solar PV capacities. To assess these different options at hand, a case study was conducted covering various scenarios for a regional power supply based on a high share of wind and solar PV. State-of-the-art concepts for all the stated technologies are modelled and a numerical optimization approach is applied on temporally-resolved time series data to identify the potential role of each option and their respective interactions. Power storage was found to be most relevant in solar dominated systems, due to the diurnal generation pattern, whereas bioenergy is more suitably combined with high wind power shares due to the less regular generation pattern. System-friendly wind and solar power can reduce the need for generation capacity and flexible options by fitting generation and demand patterns better.

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“…Specifically, a range of studies finds that at high wind penetrations, such turbines can boost the gridsystem value of wind energy by 8−30% (~$3−15/MWh) (Dalla Riva et al, 2017;Hirth, 2016;Hirth and Müller, 2016;Johansson et al, 2017;. Conceptually, this finding is a function of increased wind generation during periods of relatively lower wind speeds, which are, in some markets, at least partially correlated with higher electricity prices.…”

Section: Introductionmentioning

confidence: 99%

Opportunities for and challenges to further reductions in the “specific power” rating of wind turbines installed in the United States

et al. 2020

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A wind turbine’s “specific power” rating relates its capacity to the swept area of its rotor in terms of Watt per square meter. For a given generator capacity, specific power declines as rotor size increases. In land-rich but capacity-constrained wind power markets, such as the United States, developers have an economic incentive to maximize megawatt-hours per constrained megawatt, and so have favored turbines with ever-lower specific power. To date, this trend toward lower specific power has pushed capacity factors higher while reducing the levelized cost of energy. We employ geospatial levelized cost of energy analysis across the United States to explore whether this trend is likely to continue. We find that under reasonable cost scenarios (i.e. presuming that logistical challenges from very large blades are surmountable), low-specific-power turbines could continue to be in demand going forward. Beyond levelized cost of energy, the boost in market value that low-specific-power turbines provide could become increasingly important as wind penetration grows.

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Value of wind power – Implications from specific power

Cited by 45 publications

References 5 publications

Technology effects in repowering wind turbines

Technology effects in repowering wind turbines

Interaction of Electrical Energy Storage, Flexible Bioenergy Plants and System-friendly Renewables in Wind- or Solar PV-dominated Regions

Opportunities for and challenges to further reductions in the “specific power” rating of wind turbines installed in the United States

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