scholarly journals Linear and Nonlinear Schemes Applied to Pitch Control of Wind Turbines

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Hua Geng ◽  
Geng Yang
Keyword(s):  
Controller Design ◽  
Industrial Applications ◽  
Pitch Control ◽  
Advantages And Disadvantages ◽  
Wind Energy Conversion Systems ◽  
Energy Conversion Systems ◽  
Linear And Nonlinear ◽  
Nonlinear Schemes ◽  
Nonlinear Feature ◽  
Digital Processor

Linear controllers have been employed in industrial applications for many years, but sometimes they are noneffective on the system with nonlinear characteristics. This paper discusses the structure, performance, implementation cost, advantages, and disadvantages of different linear and nonlinear schemes applied to the pitch control of the wind energy conversion systems (WECSs). The linear controller has the simplest structure and is easily understood by the engineers and thus is widely accepted by the industry. In contrast, nonlinear schemes are more complicated, but they can provide better performance. Although nonlinear algorithms can be implemented in a powerful digital processor nowadays, they need time to be accepted by the industry and their reliability needs to be verified in the commercial products. More information about the system nonlinear feature is helpful to simplify the controller design. However, nonlinear schemes independent of the system model are more robust to the uncertainties or deviations of the system parameters.

Studying the Potential of a Novel Multiple-Generator Drivetrain in Wind Energy Conversion Systems

2013 ◽  
Author(s):  
N. Goudarzi ◽  
W. D. Zhu
Keyword(s):  
Wind Turbines ◽  
Offshore Wind ◽  
Offshore Wind Turbines ◽  
Wind Energy Conversion ◽  
Advantages And Disadvantages ◽  
Wind Energy Conversion Systems ◽  
Energy Conversion Systems ◽  
Switch Mechanism ◽  
The Cost ◽  
Operational Range

A novel multiple generator drivetrain (MGD), where a single large generator in a wind turbine is replaced by multiple generators with the same or different rated powers, is proposed along with an automatic switch mechanism as an alternative to an existing MGD. To better understand the advantages and disadvantages of having a MGD in onshore/offshore wind turbines, a MGD with a single or double stage gearbox and multiple generators is compared with a conventional drivetrain with a triple-stage gearbox and a large induction generator. A simple mathematical model for a MGD with an automatic switch is developed, a novel prototype of a MGD is designed and fabricated, and experiments are conducted on the prototype. It is concluded that a multiple-generator drivetrain with generators operating individually or in parallel through an automatic switch mechanism has a better potential of improving the efficiency and the reliability, expanding the operational range, and reducing the cost of offshore and onshore wind turbines than the existing MGD configuration.

A New Robust H∞ Control Power

2017 ◽  
pp. 1695-1718
Author(s):  
Samir Abdelmalek ◽  
Hocine Belmili
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Controller Design ◽  
Pi Controller ◽  
Control Technique ◽  
Wind Energy Conversion Systems ◽  
Grid Connection ◽  
Energy Conversion Systems ◽  
Sensitivity Problem ◽  
Doubly Fed

Attention has been paid by many researchers to address the various challenges of grid connection of DFIG-based Wind Energy Conversion Systems (WECS). This chapter focuses on the design of a robust H8 controller for the power flow between the stator of the Doubly-Fed Induction Generator (DFIG) and the grid. The robust H8 controller design is formulated as a mixed-sensitivity problem. A mathematical model of the DFIG written in an appropriate d-q reference frame is established to carry out simulations. The proposed power control scheme is elaborated and compared with a conventional Proportional-Integral (PI) controller based on vector control technique. The results show interesting performance of the controlled system in terms of the power reference tracking (the active and reactive power) and robustness against parameter variations compared with the conventional PI controller.

A New Robust H∞ Control Power

2015 ◽  
pp. 601-623 ◽  
Author(s):  
Samir Abdelmalek ◽  
Hocine Belmili
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Controller Design ◽  
Pi Controller ◽  
Control Technique ◽  
Wind Energy Conversion Systems ◽  
Grid Connection ◽  
Energy Conversion Systems ◽  
Sensitivity Problem ◽  
Doubly Fed

Attention has been paid by many researchers to address the various challenges of grid connection of DFIG-based Wind Energy Conversion Systems (WECS). This chapter focuses on the design of a robust H8 controller for the power flow between the stator of the Doubly-Fed Induction Generator (DFIG) and the grid. The robust H8 controller design is formulated as a mixed-sensitivity problem. A mathematical model of the DFIG written in an appropriate d-q reference frame is established to carry out simulations. The proposed power control scheme is elaborated and compared with a conventional Proportional-Integral (PI) controller based on vector control technique. The results show interesting performance of the controlled system in terms of the power reference tracking (the active and reactive power) and robustness against parameter variations compared with the conventional PI controller.

scholarly journals Controller Design For DFIG Driven By Variable Speed Wind Turbine Using Static Output Feedback Technique

2016 ◽  
Vol 6 (4) ◽  
pp. 1056-1061 ◽  
Author(s):  
O. P. Bharti ◽  
R. K. Saket ◽  
S. K. Nagar
Keyword(s):  
Wind Energy ◽  
Output Feedback ◽  
Performance Enhancement ◽  
Controller Design ◽  
Numerical Differentiation ◽  
Static Output Feedback ◽  
Wind Energy Conversion Systems ◽  
Simulink Model ◽  
Energy Conversion Systems ◽  
Static Output

This paper describes the controller design for a DFIG based wind energy generation system using the static output feedback technique through the LMI Toolbox. The features of the DFIG, its converters and their controllers are discussed. The lower order nominal representation of DFIG is obtained using numerical differentiation of the SIMULINK model which is subsequently used for PID controller design. The obtained results are compared with existing methods for performance enhancement of the DFIG and wind energy conversion systems.

Conditions under Which Wind Turbines Can Be Financially Viable for Private Power Generation in Industry

1986 ◽  
Vol 200 (2) ◽  
pp. 109-115 ◽  
Author(s):  
S S Thabit ◽  
P L Primrose
Keyword(s):  
Industrial Applications ◽  
Capital Projects ◽  
Wind Energy Conversion ◽  
Wind Energy Conversion Systems ◽  
Financial Conditions ◽  
North Wales ◽  
Private Power ◽  
Energy Conversion Systems ◽  
South East England ◽  
The Uk

Methods of evaluating the economics of wind energy conversion systems (WECS) reported in the literature are not readily understood by management in industry, and are not presented in a form suitable for appraising industrial investment in capital projects. This has led to companies being unaware of the advantages of investing in WECS as an option in private electricity generation. This paper presents the general principles of a comprehensively structured method of investment in a wind turbine, using a company's own local and financial conditions. The return on such an investment for an example company in south-east England is 15.8 per cent, rising to 22.4 per cent if the same company was located in North Wales where wind availability is slightly higher. These results indicate that the prospects of economically viable WECS installations for industrial applications are evident over large geographical areas of the UK.

scholarly journals Representation and estimation of the power coefficient in wind energy conversion systems

2019 ◽  
Vol 28 (50) ◽  
pp. 77-90
Author(s):  
José Genaro González-Hernández ◽  
Rubén Salas-Cabrera
Keyword(s):  
Wind Energy ◽  
Energy Conversion ◽  
Power Coefficient ◽  
University Professors ◽  
Fourth Degree ◽  
Wind Energy Conversion ◽  
Advantages And Disadvantages ◽  
Wind Energy Conversion Systems ◽  
State Observers ◽  
Energy Conversion Systems

This paper aims at summarizing various methods used for representing and estimating the power coefficient in wind turbines, such as exponential, sinusoidal and polynomial models, as well as mathematical tools known as state observers. We present an exhaustive bibliographic review of the models used to calculate the power coefficient, given that this type of studies are scarce nowadays. In addition, we propose models that can be satisfactorily used for various analyzes of wind energy conversion systems, such as the representation by a polynomial function of fourth degree and the models based on the stochastic probability function. The relevance of this work is supported by the advantages and disadvantages of the various models and estimators of the power coefficient, which are presented at the end of the article in a comparative table with the purpose of offering to the reader a general summary. Ultimately, this review aims at helping researchers, students, university professors and those who wish to venture into this field, even though they do not have much experience, to establish a quick synthesized understanding of the different models and representations of the power coefficient.

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