Analysis of Non-linear Adaptive Friction and Pitch Angle Control of Small-Scaled Wind Turbine System

Self Cite

To supply a stable and efficient electricity, small-scaled wind turbine's brake system plays an immense role in various wind speeds. Small-wind power generation systems are difficult to operate in strong wind region since the turbine could be over-rotated and damaged if the brake system is not robust enough to maintain a stable angular velocity. Most of the smallscaled wind turbines use friction brakes to control the turbine speed for a stable electricity output. Since the friction brake are run out of time and needs frequent maintenance and eventually replacement, we introduce an eddy current based wind turbine brake system which is contactless with the rotor as an alternative to the friction brake system. The advantage of the proposed brake system is that the energy loss due to the friction will be reduced and will be more durable than the friction brake. The flow of this study is at first we did the analogical experiment of blade destruction to set to the maximum allowed angular velocity. Later, in order to verify the performance and stability requirement the mathematical implementation of eddy current brake system have done in DC-Green house for various wind penetration. Eventually the feasibility of eddy current brake system is confirmed in simulation results.

Section: Conventional Methods and Proposed Methods And Its Applicationmentioning

confidence: 99%

Section: Here S Is the Laplace Operatormentioning

confidence: 99%

Alternative Braking Method for Small Scaled-Wind Turbines Connected DC Green House with Analogical Experiment on Blade Destruction

Koswatta¹,

Alsharif²,

Shiroma³

et al. 2020

Self Cite

“…The most important types of wind energy and solar energy. [2], [3]. When the wind passes according to the "cut in speed Vc" of the vertical axis wind rotor, the air rotor acquires a rotational speed around the rotor shaft to make  angle from 0 0 to 360 0 , and thus the ends of the rotor blades acquire a continuous terminal speed in r, which there is a difference in the values and proportionality between the wind speed V in contact with the rotor, this leads to the formation of what is known relative velocity W, which make the angle of attack  with the direction of the r, therefore there is a strong relationship between the angle of attack  and the Tip Speed Ratio 0 or (R/V1).…”

Section: Introductionmentioning

confidence: 99%

Performance of Vertical Axis Wind Turbine Type of Slant Straight Blades

Abusannuga¹,

Özkaymak²

2021

There is no doubt that energy is one of the most important requirements of life, and its importance increases with the passage of time, and this is what make countries to harness the capabilities and scientists in developing energy systems of all kinds, one of the most important energy systems these days is what is known as vertical axis wind turbines. If we compare this type of system with horizontal axis wind turbines, it is characterized by a relatively lower manufacturing cost. But on the other hand, it suffers from less efficiency in addition to the problem of starting the self-movement. The idea of this research revolves around the use of an engineering design for the vertical axis wind rotor that is very rarely used in the field of wind energy. This design takes the geometric shape of two inverted trapezoids. Within the framework of this study, the term "slant straight-blade vertical axis wind turbine" (SS-VAWT) was assigned to the wind rotor. Amendments have been made to the mathematical model of Multi stream tube to make it suitable for application and work on (SS-VAWT), where, it is known that the multi-stream tube model uses primarily and only for the original Darrieus and the H-Darrieus rotors. In order to prove the efficacy of the software used, the results obtained from it were compared with the practical results of previous studies, as it proved its effectiveness in obtaining the satisfactory results that were intended for this analysis. The analyzes and investigations that were conducted on the improved SS design included changing the geometry by changing some of its dimensional parameters represented in rotor height, rotor diameter, number of rotor blades, rotor blade section length, rotor blade section type and rotor blades inclination angle on the horizontal plane. Within the scope of the case studies that were worked on in this research, the results showed that the best efficiency of the SS rotor was achieved in the range of height to radius ratio (0.66 to 1), cord line length to radius ratio about 0.12 The angle of inclination of the blades is between 45-and 65-degrees Degree. In these ranges, the value of Max power factors has reached its turn, and the energetic range of the rotor has increased as a function of the peripheral relative velocity, in addition to a relatively large solution to the problem of starting self-movement, which appears through the highest-power factor values to move away from the limits of negative values in the range Terminal forgetfulness from 1 to 3. In addition, the effect of changing Raynaud's number on the turbine aerodynamic performance has been investigated. The results showed that the higher the Reynolds value, the higher the power factor value, the higher the energy range and the lessening the problem of starting the self-movement.

“…To supply a stable electricity output, small-scaled wind turbines uses several control methods such as pitch control [2][3], yaw control, brake control [4][5][6]. Considering brake control, it is mainly focus on brake pad-based system for the safety of the wind turbine [7] while contactless brake systems related research is ongoing currently.…”

Section: Introductionmentioning

confidence: 99%

Maximum Power-Point Tracking and Stall Control with Eddy Current Brake System on Small-Scaled Wind Turbines and its Application on Agricultural Harvesting

Koswatta¹,

Alsharif²,

Shiroma³

et al. 2020

Self Cite

This research aims to enhance the generated power of the small-scaled wind turbine using the eddy current brake system and Maximum Power Point Tracking (MPPT) control method. We analyzed the behavior of the generated power and power factor, with and without the MPPT control which implemented by eddy current brake system. Also, the feasibility of the system investigated using different wind conditions such as strong and calm wind conditions. The load data has different voltage respond to the system since its conditions depend on the day/night loads pattern, weather conditions, soil moisture. Moreover, the analogical experiment for small-scaled wind turbine blade destruction is analyzed to determine the maximum penetration value of mechanical power in order to retrieve an optimal angular velocity which resulting in provides a possible maximum power to loads. At the same time, emergency break is operated when angular velocity reaches to critical speed to avoid destruction. In the simulation, we collected the real load data from a mango farm in Okinawa prefecture in Japan. The results were analyzed through simulations for the different wind conditions. In the end of simulation, we could verify that either Maximum Power Point and emergency control are activated correspondingly.