Abstract
The risk of oscillation of grid-connected wind turbine generators (WTGs) is well known, making it all the more important to understand the characteristics of different WTGs and analyze their performance so that the problems’ causes are identified and resolved. While many studies have evaluated the performance of grid-connected WTGs, most lack clarity and precision in the modeling and simulation techniques used. Moreover, most of the literature focuses on a single mode of operation of WTGs to analyze their performances. Therefore, this paper updates the literature by considering the different operating conditions for WTGs. Using MATLAB/SIMULINK it expands the evaluation to the full range of vulnerabilities of WTGs: from the wind turbine to grid connection. A network representing grid-connected squirrel-cage induction generator (SCIG) and doubly-fed induction generator (DFIG) wind turbines are selected for simulation. The performances of SCIG and DFIG wind turbines are evaluated in terms of their energy generation capacity during constant rated wind speed, variable wind speed, and ability of fault-ride through during dynamic system transient operating conditions. The simulation results show the performance of DFIG is better than SCIG in terms of its energy generation capacity during variable wind speed conditions and active and reactive power control capability during steady-state and transient operating conditions. As a result, DFIG wind turbine is more suitable for large-scale wind power plants connected to weak utility grid applications than SCIG.
Highlights
Due to limited resources of conventional energy generation sources like fossil fuels and, more importantly, their negative impact on the environment, the installed capacity of renewable energy sources such as wind and solar is rapidly increasing [1]
The generated output power of the squirrel-cage induction generator (SCIG) and doubly-fed induction generator (DFIG) wind turbines depends on the wind speed, generator speed, and pitch angle
This paper presented a straightforward performance evaluation technique for gridconnected SCIG and DFIG wind turbine generators
Summary
Due to limited resources of conventional energy generation sources like fossil fuels and, more importantly, their negative impact on the environment, the installed capacity of renewable energy sources such as wind and solar is rapidly increasing [1]. Most of the literature is focused on a single mode of operation of WTGs to analyze the performances of grid-connected WTGs. This study, aims to evaluate the performance of grid-connected WTGs. Our key research question is, how does a large-scale grid integrated WPP affect the performances of the power system during constant rated wind speed, variable wind speed, and dynamic transient operation conditions? The performances of SCIG and DFIG wind turbines are simulated under four different selected scenarios, including constant rated wind speed, variable wind speed, steady-state, and dynamic transient operating conditions. This work provides the performance analysis results of grid-connected SCIG and DFIG wind turbines during steady-state and transient operation conditions using MATLAB/SIMULINK model for researchers, power system operators, and wind turbine manufacturers. The paper is organized as follows: Section 2 discuss the fundamentals, advantage, disadvantages, types, characteristics, and topologies of WTGs. Section 3 provides a MATLAB/SIMULINK model and simulation technique for grid-connected SCIG and DFIG wind turbines.
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