Control of wind power systems imposing the current in the intermediate circuit of the converter at variable wind speed

2015 ◽  
Author(s):  
Cristian-Paul Chioncel ◽  
Gheza-Mihai Erdodi ◽  
Doru-Ionut Petrescu ◽  
Elisabeta Spunei ◽  
Nicoleta Gillich
Keyword(s):  
Wind Speed ◽  
Power Systems ◽  
Wind Power ◽  
Wind Power Systems ◽  
Variable Wind ◽  
Intermediate Circuit

scholarly journals BASIC SPECIFICATION REGARDING THE WIND POWER SYSTEMS CONTROL

2014 ◽  
Vol 12 (9) ◽  
pp. 3927-3944
Author(s):  
Florica Balog ◽  
Horia Ciocarlie ◽  
Gheza-Mihai Erdodi ◽  
Marius Babescu
Keyword(s):  
Wind Speed ◽  
Power Systems ◽  
Permanent Magnet ◽  
Wind Power ◽  
Rotation Speed ◽  
Synchronous Generator ◽  
Permanent Magnet Synchronous Generator ◽  
Control Structures ◽  
Wind Power Systems ◽  
Variable Wind

The paper proposes an original metod to control the wind power system at variable wind speed. In the case of those high power wind systems that presents large inertia moments due to the variable wind speed, the rotation speed of both wind turbine and permanent magnet synchronous generator can not be modified in a timely manner so as to ensure the turbine operating in maximum power points. Therefore, the paper presents two control structures. First structure is based on the load calculation of permanent magnet synchronous generator and the second is based on the load modifying by using controllers. The rotation speed of turbine estimation has been used as reference in the both structures.

scholarly journals Optimal and stable energetic operation of wind power systems at variable wind speed

2020 ◽  
Vol 1426 ◽  
pp. 012041 ◽  
Author(s):  
C P Chioncel ◽  
C Murarescu ◽  
M Dudu ◽  
O G Tirian
Keyword(s):  
Wind Speed ◽  
Power Systems ◽  
Wind Power ◽  
Wind Power Systems ◽  
Variable Wind

Operation Characteristics of Zone 3 Distance Protection in Wind Power Systems with Fixed-Speed Induction Generators

2011 ◽  
Vol 12 (4) ◽  
Author(s):  
Shenghu Li
Keyword(s):  
Power Systems ◽  
Wind Power ◽  
Reactive Power ◽  
Flow Analysis ◽  
Load Flow ◽  
Synchronous Generators ◽  
Induction Generators ◽  
Load Flow Analysis ◽  
Wind Power Systems ◽  
Operation Characteristics

The induction generators (IGs) are basic to wind energy conversion. They produce the active power and consume the reactive power, with the voltage characteristics fragile compared with that of the synchronous generators and doubly-fed IGs. In the stressed system states, they may intensify var imbalance, yielding undesirable operation of zone 3 impedance relays.In this paper, the operation characteristics of the zone 3 relays in the wind power systems is studied. With the theoretical and load flow analysis, it is proved that the equivalent impedance of the IGs lies in the 2nd quadrature, possibly seen as the backward faults by the mho relays, i.e. the apparent impedance enters into the protection region from the left side. The undesirable operation may be caused by more wind power, larger load, less var compensation, and larger torque angle.

scholarly journals Numerically and Experimentally Verified Design of a Small Wind Turbine with Injection Molded Blade

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 776
Author(s):  
Byunghui Kim ◽  
Sang-June Park ◽  
Seokyoung Ahn ◽  
Myung-Gon Kim ◽  
Hyung-Gun Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Power Systems ◽  
Wind Turbine ◽  
Wind Power ◽  
Offshore Wind ◽  
Power Coefficient ◽  
Manufacturing Method ◽  
Small Wind Turbine ◽  
Verification Methods ◽  
Wind Power Systems

Although mega-watt class onshore and offshore wind power systems are used to generate power due to their cost-effectiveness, small wind power systems are important for household usages. Researchers have focused on aerodynamic characteristics as a conceptual design from their previous studies on Archimedes spiral wind turbines. Here, we verified the design of a small wind turbine AWM-750D (100 W capacity) via both numerical simulation and experimentation. We used commercial code ANSYS CFX for numerical simulation and compared turbulence models and surface roughness for determining the performance. To obtain reliable and robust blades, we analyzed the effective manufacturing method with Moldflow. Through a test with an open-suction type atmospheric boundary layer wind tunnel, we varied wind speed from 4.0 m/s to the rated value of 12.5 m/s and obtained 106 W, equivalent to a power coefficient of 0.205. In addition, we compared the numerical and experimental power vs. rotational speed and found the former is 6.5% lower than the latter. In this study, we proved that numerical simulations can act as design verification methods to predict wind turbine performances and reliable manufacturing. Through our research, we provided the prototype of a small wind turbine with 100 W to act as an efficient electric power supplier for households and also the stable manufacturing process for complex spiral blades using injection molding.

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