Summary Satisfactory performance of doubly fed induction generator (DFIG) is indebted to determining the proportional‐integral (PI) gains of the power electronic converter controls as accurate as possible to guarantee minimum transients when disturbances occurred in the power system. Since the DFIG is introduced as a dynamical system, PI gains must be changed according to the system requirements. Fuzzy controllers designed based on our best knowledge on the system behavior are able to continuously adjust parameters of the control system to enhance the performance of the system. In this paper, a control scheme based on self‐tuning fuzzy PI (STFPI) is proposed to control the power electronic converters of the DFIG. Different arrangements of the STFPI controller are considered in the control scheme of active and reactive power. The performances of the DFIG in three operating modes are compared when the STFPI and the conventional PI are installed and the system experiences a single phase to ground short circuit fault. Super‐synchronous, synchronous, and sub‐synchronous operating modes are examined in the paper. The idea is implemented on a study system equipped with a DFIG wind turbine, and the obtained results show that when the proposed scheme is employed a superior performance can be achieved in transient conditions and the transients are significantly improved. Copyright © 2014 John Wiley & Sons, Ltd.
The progress of wind-energy generation around the world in recent years has been consistently impressive. As more and more attention is paid to the increase of wind-turbine farms, a number of problems should be investigated in more detail. Among these problems, the transient stability of wind farms implemented with induction generators becomes necessary, especially when operating into a weak connection. The transient behavior and stability of wind farms with induction generators have been studied in this paper and some important operating conditions are analyzed. The impact of some important parameters such as strength of main grid, of X/R ratio of the transmission line on the transient stability of wind farm, and operation during severe faults are all investigated. The results of simulation show that these parameters have a great impact on the transient stability of wind farm. Power-system oscillation caused by a transient fault in the vicinity of a wind turbine is the worst case scenario, as the wind turbine has to ride through the fault and keep its stability.
Recently, the growing integration of wind energy into power networks has had a significant impact on power systemstability. Amongst types of large capacity wind turbines (WTs), doubly-fed induction generator (DFIG) wind turbinesrepresent an important percentage. This paper attemps to study the impact of DFIG wind turbines on the powersystem stability and dynamics by modeling all components of a case study system (CSS). Modal analysis is usedfor the study of the dynamic stability of the CSS. The system dynamics are studied by examining the eigenvaluesof the matrix system of the case study and the impact of all parameters of the CSS are studied in normal,subsynchronous and super-synchronous modes. The results of the eigenvalue analysis are verified by usingdynamic simulation software. The results show that each of the electrical and mechanical parameters of the CSSaffect specific eigenvalues.
The small-disturbance voltage stability of a gridconnected wound-rotor induction-generator (WRIG) windturbine system is analyzed under different operating conditions. This theoretical study shows the effect of the wound-rotor induction generator and its parameters on load-bus voltage collapse phenomena. Results show that the rotor resistance of the induction generators may decrease the system voltage stability margin and that the transmission line length has an important effect on the maximum loading point and critical point of loading.
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