Hydraulic–pneumatic flywheel system in a wind turbine rotor for inertia control

Jauch, Clemens; Hippel, Sebastian

doi:10.1049/iet-rpg.2015.0223

Cited by 29 publications

(39 citation statements)

References 10 publications

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“…As explained in previous work of the authors, the FW generates an additional torque from the change in angular momentum . This FW torque, T fw , can also be expressed in terms of Coriolis force, F cor , acting on the variable radius of the FW, R var , as described in Equation .

T_{fw} = 3 \cdot F_{cor} \cdot R_{var}

…”

Section: Load Analysismentioning

confidence: 99%

“…The recovery phase can be circumvented using the hydraulic‐pneumatic flywheel (FW) system integrated in the WT rotor (see Figure A). Kinetic energy is stored or released by changing the rotor's mass moment of inertia independently of the rotational speed …”

Section: Introductionmentioning

confidence: 99%

“…The general idea of the FW system, the physical description, and its performance in terms of providing rapid controllable power to the power system and mitigating loads on the WT were previously presented . A FW system was designed for the 5‐MW WT developed by the National Renewable Energy Laboratory (NREL) and the 61.5‐m rotor blade developed by Brian R. Resor (hereafter referred to as “Resor blade”).…”

Section: Introductionmentioning

confidence: 99%

“…The design and position of the piston accumulators within the blade determine the controllable kinetic energy of the WT rotor. A superior performance compared with the technique of synthetic inertia is achieved by varying the rotor inertia of a WT by 15% . As a result, several FW configurations (all increasing the rotor inertia of the 5‐MW WT by 15%) were derived.…”

Section: Introductionmentioning

confidence: 99%

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Load analysis of hydraulic‐pneumatic flywheel configurations integrated in a wind turbine rotor

Hippel

Jauch

2019

Wind Energy

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In this paper, the impact on the mechanical loads of a wind turbine due to a previously proposed hydraulic‐pneumatic flywheel system is analysed. Load simulations are performed for the National Renewable Energy Laboratory (NREL) 5‐MW wind turbine using fatigue, aerodynamics, structures, and turbulence (FAST). It is discussed why FAST is applied although it cannot simulate variable rotor inertia. Several flywheel configurations, which increase the rotor inertia of the 5‐MW wind turbine by 15%, are implemented in the 61.5‐m rotor blade. Load simulations are performed twice for each configuration: Firstly, the flywheel system is discharged, and secondly, the flywheel is charged. The change in ultimate and fatigue loads on the tower, the low speed shaft, and the rotor blades is juxtaposed for all flywheel configurations. As the blades are mainly affected by the flywheel system, the increase in ultimate and fatigue loads of the blade is evaluated. Simulation results show that the initial design of the flywheel system causes the lowest impact on the mechanical loads of the rotor blades although this configuration is the heaviest.

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T_{fw} = 3 \cdot F_{cor} \cdot R_{var}

…”

Section: Load Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Load analysis of hydraulic‐pneumatic flywheel configurations integrated in a wind turbine rotor

Hippel

Jauch

2019

Wind Energy

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“…Another piece of GUIsoftware, called HAWT-Perform, was developed using Equation (9) to calculate the output torque. Figure 6 is the GUI of HAWT-Perform, showing such analysis of the resulting torque, output mechanical power, and the corresponding Cp (power coefficient) of the blade design.…”

Section: Gui Of Blade Performance Developmentmentioning

confidence: 99%

Experiments on the Performance of Small Horizontal Axis Wind Turbine with Passive Pitch Control by Disk Pulley

Chen

Shiah

2016

Energies

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Abstract:The present work is to design a passive pitch-control mechanism for small horizontal axis wind turbine (HAWT) to generate stable power at high wind speeds. The mechanism uses a disk pulley as an actuator to passively adjust the pitch angle of blades by centrifugal force. For this design, aerodynamic braking is caused by the adjustment of pitch angles at high wind speeds. As a marked advantage, this does not require mechanical brakes that would incur electrical burn-out and structural failure under high speed rotation. This can ensure the survival of blades and generator in sever operation environments. In this paper, the analysis uses blade element momentum theory (BEMT) to develop graphical user interface software to facilitate the performance assessment of the small-scale HAWT using passive pitch control (PPC). For verification, the HAWT system was tested in a full-scale wind tunnel for its aerodynamic performance. At low wind speeds, this system performed the same as usual, yet at high wind speeds, the equipped PPC system can effectively reduce the rotational speed to generate stable power.

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Deployment of onshore wind turbine generator topologies: Opportunities and challenges

Ogidi

Khan

Dehnavifard

2019

Int Trans Electr Energ Syst

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Summary At the end of 2018 the total global installed wind turbine capacity stood at approximately 592 GW; 96% of these installations are located onshore. Yet, an additional 267 GW of onshore capacity is projected to be installed by the end of 2023. This is envisaged to open up more opportunities in the development of onshore wind turbine generator (WTG). Therefore, this survey article brings together variable‐speed onshore WTG topologies, alongside their applicable drivetrains and converter technologies. Spotlight is on their merits and respective limitations which create opportunities and challenges in their deployments in commercial installations. It also evaluates and discusses a new development in the most widely deployed onshore WTG topology and concludes by identifying the single biggest development driver. [Correction added on 22 January 2020, after first online publication: The first sentence of the Summary heading has been corrected and updated online.]

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Hydraulic–pneumatic flywheel system in a wind turbine rotor for inertia control

Cited by 29 publications

References 10 publications

Load analysis of hydraulic‐pneumatic flywheel configurations integrated in a wind turbine rotor

Load analysis of hydraulic‐pneumatic flywheel configurations integrated in a wind turbine rotor

Experiments on the Performance of Small Horizontal Axis Wind Turbine with Passive Pitch Control by Disk Pulley

Deployment of onshore wind turbine generator topologies: Opportunities and challenges

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