Comparison of Power Coefficients in Wind Turbines Considering the Tip Speed Ratio and Blade Pitch Angle

Carranza, O.; Andrade, Viviana Reyes; Rivas, Jaime José Rodríguez; González, R.

doi:10.3390/en16062774

Cited by 18 publications

(5 citation statements)

References 43 publications

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“…Under this pitch control, the pitched yellow power curve intersects with the ω Tmax vertical line at the point B 3 in Figure 11. In accordance with (25), power output at this point is 10% deloaded from the maximum available power output at B 1 . To satisfy the cubic relationship between the rotor speed and the power output shown in (4), this deloading (pitch-controlled) power reference curve is designed to connect the point of intersection with the origin:…”

Section: Proposed Hybrid Deloading Methodssupporting

confidence: 53%

“…For different wind speeds, a look-up table (Table 1) for the required pitch angles (β del ) at 10% deloading can be built. The required pitch angles for other deloading factors can also be computed using (25). To determine the pitch angle for 10% deloading at intermediate wind speeds not listed in Table 1, the modified Akima piecewise cubic Hermite interpolation (Makima) is used for its ability to balance curve smoothness with fidelity to discrete data points.…”

Section: Proposed Hybrid Deloading Methodsmentioning

confidence: 99%

“…where ω T is the rotor's angular speed. C p can be mathematically expressed using various functions [25], and this study employs a polynomial function:…”

Section: Wind Turbine Aerodynamicsmentioning

confidence: 99%

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Hybrid Deloading Control Strategy in MMC-Based Wind Energy Conversion Systems for Enhanced Frequency Regulation

Zhang,

2024

Energies

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The growing integration of renewable energy sources, especially offshore wind (OSW), is introducing frequency stability challenges to electric power grids. This paper presents a novel hybrid deloading control strategy that enables modular multilevel converter (MMC)-based wind energy conversion systems (WECSs) to actively contribute to grid frequency regulation. This research investigates a permanent-magnet synchronous generator (PMSG)-based direct-drive configuration, sourced from the International Energy Agency’s (IEA’s) 15 MW reference turbine model. Specifically, phase-locked loop (PLL)-free grid-forming (GFM) control is employed via the grid-side converter (GSC), and DC-link voltage control is realized through the machine-side converter (MSC), both of which boost the energy support for the integrated AC grid’s frequency stability. This control strategy combines the benefits of over-speeding and pitch control modes, facilitating smooth transitions between different modes based on real-time wind speed measurements. In addition, the practical challenges of MMCs, such as circulating currents and capacitor voltage imbalances, are addressed. Numerical simulations under varying wind speeds and loading conditions validate the enhanced frequency regulation capability of the proposed approach.

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Section: Proposed Hybrid Deloading Methodssupporting

confidence: 53%

Section: Proposed Hybrid Deloading Methodsmentioning

confidence: 99%

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Hybrid Deloading Control Strategy in MMC-Based Wind Energy Conversion Systems for Enhanced Frequency Regulation

Zhang,

2024

Energies

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“…Each type of wind turbine is characterized by a specific coefficient C p . Figure 2 shows the trend of coefficient C p versus tip-speed ratio λ-relation (5)-for a given turbine type [22,23]:…”

Section: Wind Turbine Parametersmentioning

confidence: 99%

Experimental Assessment of Suitability of Darrieus and Savonius Turbines for Obtaining Wind Energy from Passing Vehicles

Łyskawiński,

Kowalski,

Wojciechowski

2024

Energies

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The article deals with the results of a comparative analysis carried out on the construction of wind turbines applied in energy generation systems using the wind of passing vehicles. The structures of turbines with horizontal and vertical axes of rotation were considered. Vertical axis wind turbines (VAWTs) have been observed to operate in various wind directions, including highly turbulent winds. Therefore, for further experimental research, VAWTs have been selected, i.e., Darrieus and Savonius turbines and their modifications. For the purpose of experimental research, the authors developed and implemented their own laboratory setup. This setup enabled the measurement of quantities such as torque, power, and power coefficient and allowed for the determination of the start-up parameters of the investigated turbines. Moreover, as part of the research, wind speed was also measured in field conditions at a distance of 1 m from the expressway. The wind speed obtained from passing vehicles did not exceed 9 m/s. For this reason, the tests of the considered turbines using the experimental setup were performed for wind speeds in the range of 5.8–8.6 m/s. The investigations were conducted based on the obtained results, and it was concluded that the helical Savonius turbine possessed the highest efficiency (0.2047 from a wind speed of 5.8 m/s) in generating energy from the wind produced by vehicles traveling on roads.

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“…2. Rotor power coefficient and Tip-Speed Ratio relationshipgraph for different wind turbine design solutions[11]…”

mentioning

confidence: 99%

Computational Fluid Dynamics Studies of a Vertical Axis Wind Turbine with a Variable Swept Area

Pędzisz,

Magryta,

Pietrykowski

2024

Adv. Sci. Technol. Res. J.

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The article presents the results of the Computational Fluid Dynamics (CFD) research on a vertical axis wind turbine with a variable swept area. The tested turbine has four sets of blades, each of which consists of two moving parts. By changing the angle between these parts, it is possible to change the swept area of the turbine wheel to adjust the characteristics of the turbine to the current wind speed. In the case of strong wind, it is possible to fold blades to protect the rotor against damage. The 3D-CFD model was tested using the ANSYS Fluent software. The four rotors differing in the blade angle were analyzed. The tests were carried out for different wind speeds. The results are presented as pressure and velocity distributions as well as streamlines around the rotor. In addition, the waveforms of the torque acting on a single blade and on the entire rotor are shown. The average rotor torque was also calculated. These findings enabled us to create the characteristics of the power factor for different rotational speeds of the rotor. The results show that the adjustment of the swept area makes the z-turbine have a flexible operating range.

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Comparison of Power Coefficients in Wind Turbines Considering the Tip Speed Ratio and Blade Pitch Angle

Cited by 18 publications

References 43 publications

Hybrid Deloading Control Strategy in MMC-Based Wind Energy Conversion Systems for Enhanced Frequency Regulation

Hybrid Deloading Control Strategy in MMC-Based Wind Energy Conversion Systems for Enhanced Frequency Regulation

Experimental Assessment of Suitability of Darrieus and Savonius Turbines for Obtaining Wind Energy from Passing Vehicles

Computational Fluid Dynamics Studies of a Vertical Axis Wind Turbine with a Variable Swept Area

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