Abstract
Wind energy is one of the extraordinary sources of renewable energy due to its clean character and free availability. With the increasing wind power penetration, the wind farms are directly influencing the power systems. The majority of wind farms are using variable speed wind turbines equipped with doubly fed induction generators (DFIG) due to their advantages over other wind turbine generators (WTGs). Therefore, the analysis of wind power dynamics with the DFIG wind turbines has become a very important research issue, especially during transient faults. This paper presents fuzzy logic control of doubly fed induction generator (DFIG) wind turbine in a sample power system. Fuzzy logic controller is applied to rotor side converter for active power control and voltage regulation of wind turbine.
Highlights
Fed induction generator (DFIG) is one of the most popular wind turbines which includes an induction generator with slip ring
The most common type of generators used in the wind energy conversion system (WECS) was the squirrel cage induction generator (SCIG), a fixed speed wind turbine generator (WTG) system, which has a number of drawbacks [1]
That is why the generator absorbs reactive power from the grid and results in voltage and frequency instability. Such instability problems can be solved by dynamic compensation of generator’s reactive power demand by the following two methods: (i) using shunt flexible AC transmission system (FACTS) devices, such as the static VAR compensator (SVC) and the static synchronous compensator (STATCOM), to generate a set of balanced three-phased sinusoidal voltages at the fundamental frequency with rapidly controllable amplitude and phase angle to drive PWM converter with dc-link capacitor and transport necessary reactive power in the grid [5, 27, 28], and (ii) reconfiguring rotor-side converter (RSC) in parallel with grid-side converter (GSC) during fault so that both feed a good amount of reactive current, which is again intensified by transient control mode (TCM) [29]
Summary
Fed induction generator (DFIG) is one of the most popular wind turbines which includes an induction generator with slip ring. Wind energy has a significant impact on dynamic behavior of power system during normal operations and transient faults with larger penetration in the grid. The RSC will restart and the wind turbine will return to normal operation once the fault has been cleared and reestablish the voltage and frequency in the power network. Unlike conventional power plants, during and immediately following a grid failure, all the wind turbines will trip due to their inability to support the voltage and the frequency of the grid during the period This might cause serious voltage recovery problems following a three-phase fault and begin to influence the overall power system stability [4]. These renewable energy generators should be able to withstand and supply active and reactive power for frequency and voltage support immediately after the fault has been cleared to control and stabilize the power system following the disturbance [5]. Without the need for a detailed mathematical model of the system and just using the knowledge of the total operation and behavior of system, tuning of parameters can be done more
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