Robust VAWT control system evaluation by coupled aerodynamic and electrical simulations

Goude, Anders; Bülow, Fredrik

doi:10.1016/j.renene.2013.03.038

Cited by 20 publications

(11 citation statements)

References 11 publications

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“…Additionally, the power coefficient C p , which mainly depends on the tip speed ratio, also decreases slightly at lower wind speeds. Because of these issues, the turbine can stop, or react slowly when controlled by the (3) strategy at low wind speeds [18]. Therefore, an under speed control was implemented inspired by the work in [18].…”

Section: Under-/over-speed Controlmentioning

confidence: 99%

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Critical Speed Control for a Fixed Blade Variable Speed Wind Turbine

2017

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A critical speed controller for avoiding a certain rotational speed is presented. The controller is useful for variable speed wind turbines with a natural frequency in the operating range. The controller has been simulated, implemented and tested on an open site 12 kW vertical axis wind turbine prototype. The controller is based on an adaptation of the optimum torque control. Two lookup tables and a simple state machine provide the control logic of the controller. The controller requires low computational resources, and no wind speed measurement is needed. The results suggest that the controller is a feasible method for critical speed control. The skipping behavior can be adjusted using only two parameters. While tested on a vertical axis wind turbine, it may be used on any variable speed turbine with the control of generator power.

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Section: Under-/over-speed Controlmentioning

confidence: 99%

“…Because of these issues, the turbine can stop, or react slowly when controlled by the (3) strategy at low wind speeds [18]. Therefore, an under speed control was implemented inspired by the work in [18]. The same approach was chosen for the over speed limit giving rise to the under-/over-speed controller as follows:…”

Section: Under-/over-speed Controlmentioning

confidence: 99%

Critical Speed Control for a Fixed Blade Variable Speed Wind Turbine

2017

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“…In the work presented in [26,27] farm operation of VAWTs is examined with the use of the vortex method coupled to an electrical system. The focus is on different farm configurations and the power absorbed as a function of the electrical system topology.…”

Section: Simulations Of Farm Operationmentioning

confidence: 99%

“…Work has also been carried out on how the vortex method calculations can be accelerated through the fast multipole methods and the usage of GPUs [62,63]. The vortex method has been applied to calculate the effects of flow confinement on the turbine performance [64], and also to calculate the performance of farms of vertical axis turbines [26,27,65,66] The work on improving the models is ongoing and a study looking at finding a suitable dynamic stall model for vertical axis wind turbines is presented in [67]. A study comparing two dynamic stall models is presented in [68] and a study using a free vortex model coupled with a dynamic stall model to further investigate dynamic stall effects on VAWT operation is presented in [69].…”

Section: Research On Aerodynamics For Vertical Axis Turbinesmentioning

confidence: 99%

A Review of Research on Large Scale Modern Vertical Axis Wind Turbines at Uppsala University

2016

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This paper presents a review of over a decade of research on Vertical Axis Wind Turbines (VAWTs) conducted at Uppsala University. The paper presents, among others, an overview of the 200 kW VAWT located in Falkenberg, Sweden, as well as a description of the work done on the 12 kW prototype VAWT in Marsta, Sweden. Several key aspects have been tested and successfully demonstrated at our two experimental research sites. The effort of the VAWT research has been aimed at developing a robust large scale VAWT technology based on an electrical control system with a direct driven energy converter. This approach allows for a simplification where most or all of the control of the turbines can be managed by the electrical converter system, reducing investment cost and need for maintenance. The concept features an H-rotor that is omnidirectional in regards to wind direction, meaning that it can extract energy from all wind directions without the need for a yaw system. The turbine is connected to a direct driven permanent magnet synchronous generator (PMSG), located at ground level, that is specifically developed to control and extract power from the turbine. The research is ongoing and aims for a multi-megawatt VAWT in the near future.

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“…VAWTs are usually stall regulated due to the complexities with pitch regulation [9,10]. Therefore, the effect of dynamic stall is very important for the operation of VAWTs.…”

Section: Introductionmentioning

confidence: 99%

Simulating Dynamic Stall Effects for Vertical Axis Wind Turbines Applying a Double Multiple Streamtube Model

Dyachuk

Goude

2015

Energies

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Abstract:The complex unsteady aerodynamics of vertical axis wind turbines (VAWT) poses significant challenges to the simulation tools. Dynamic stall is one of the phenomena associated with the unsteady conditions for VAWTs, and it is in the focus of the study. Two dynamic stall models are compared: the widely-used Gormont model and a Leishman-Beddoes-type model. The models are included in a double multiple streamtube model. The effects of flow curvature and flow expansion are also considered. The model results are assessed against the measured data on a Darrieus turbine with curved blades. To study the dynamic stall effects, the comparison of force coefficients between the simulations and experiments is done at low tip speed ratios. Simulations show that the Leishman-Beddoes model outperforms the Gormont model for all tested conditions.

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Robust VAWT control system evaluation by coupled aerodynamic and electrical simulations

Cited by 20 publications

References 11 publications

Critical Speed Control for a Fixed Blade Variable Speed Wind Turbine

Critical Speed Control for a Fixed Blade Variable Speed Wind Turbine

A Review of Research on Large Scale Modern Vertical Axis Wind Turbines at Uppsala University

Simulating Dynamic Stall Effects for Vertical Axis Wind Turbines Applying a Double Multiple Streamtube Model

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