“…These turbines are based DFIG [15]- [16], PWM converter based on IGBT AC/DC/AC. The stator is connected directly to the network under the 60Hz frequency.…”
In recent years, applications of facts systems have been developed for the compensation of active and reactive power. Facts systems are electronics devices that are connected to the wind farm. This paper presents the impacts of some of these devices on the stability of a wind farm, especially D-STATCOM, Static Var Compensator and Fuzzy SVC controller. First, a presentation of D-STATCOM, SVC, then fuzzy logic controller. In simulation study, the D-STATCOM ensures the stability of the voltage and current at the point of connection with the electrical grid. Finally, Comparing the SVC to the F-SVC simulations, we notice that the F-SVC is more performed than SVC for the compensation of the active and reactive power.
“…These turbines are based DFIG [15]- [16], PWM converter based on IGBT AC/DC/AC. The stator is connected directly to the network under the 60Hz frequency.…”
In recent years, applications of facts systems have been developed for the compensation of active and reactive power. Facts systems are electronics devices that are connected to the wind farm. This paper presents the impacts of some of these devices on the stability of a wind farm, especially D-STATCOM, Static Var Compensator and Fuzzy SVC controller. First, a presentation of D-STATCOM, SVC, then fuzzy logic controller. In simulation study, the D-STATCOM ensures the stability of the voltage and current at the point of connection with the electrical grid. Finally, Comparing the SVC to the F-SVC simulations, we notice that the F-SVC is more performed than SVC for the compensation of the active and reactive power.
“…The reference of the active one is determined using MPPT strategy. The Grid side converter controls the active and reactive powers exchanged between the machine rotor and the grid [20].…”
In this work, a robust Adaptive sliding mode controller (ASMC) is proposed to improve the dynamic performance of the Doubly Fed Induction generator (DFIG) based wind system under variable wind speed conditions. Firstly, the dynamic modeling of the main components of the system is performed. Thereafter, the ASMC is designed to control the active and reactive powers of the machine stator. The structure of these controllers was improved by adding two integral terms. Their sliding gains are determined using Lyapunov stability theorem to make them automatically adjusted in order to tackle the external disturbances. Maximum Power Point Tracking (MPPT) strategy was also applied to enhance the power system efficiency. Then, a comparison study with the Field Oriented Control (FOC) based on conventional PI control was conducted to assess the robustness of this technique under the DFIG parameters variations. Finally, a computer simulation was achieved in MATLAB/SIMULINK environment using 2MW wind system model. Satisfactory performances of the proposed strategy were clearly confirmed under variable operating conditions.
“…The results showed that when the capacity of the wind farm is large, the conventional asynchronous wind turbines enhance the system damping but the doubly fed wind turbines obviously reduce the damping of the system [8]. While the oscillation mode is strongly related to the wind turbines, the oscillation of the system is restrained.…”
Original scientific paper This paper presents an improved model of multi-DGs system for enhancing the stability. The distributed generations (DGs) in the system are equipped with the additional active power controller as the technique of enhancing the wind-thermal-bundled system stability. Firstly, the influence of multi-DGs system on the oscillation of the system is analysed. Then, the conditions for DGs producing positive damping to the power system are obtained. Secondly, taking the wind farm as the study object, the increment of the frequency of the point of common coupling (PCC) in the wind farm is feedback to the active control loops for regulating the active power of wind turbine. At the same time, the multi-DGs system holds a positive damping effect on the power system which enables the dynamic behaviour of the wind farm to be improved. Thirdly, the effect of time delay on control performance is further considered and two propositions for solving critical time-delay are put forward and proved, which are used as the constraint condition of additional active power control. Finally, the time domain simulation is implemented and the correctness of the proposed method is verified by the root locus analysis and frequency domain simulation. The results show that the additional active power control can significantly enhance the power system damping. However, the wind farm will provide negative damping and even the whole system will not maintain the power angle stability when the time-delay increases and exceeds the critical time-delay.
Keywords: anti-islanding; critical time-delay; multi-DGs system; power system damping; wind farm
Istraživanje stabilnosti Multi-DGs sustavaIzvorni znanstveni članak U radu se daje poboljšani model multi-DGs sustava za poboljšanje stabilnosti. Distribuirana proizvodnja (DGs) u sustavu opremljena je dodatnim regulatorom snage kao metodom za poboljšanje stabilnosti vjetro-toplinskog višežilnog sustava. Najprije se analizira utjecaj multi-DGs sustava na oscilacije sustava. Tada se postižu uvjeti da DGs stvaraju pozitivno prigušenje energetskog sustava. Zatim, uzmajući vjetroelektranu za predmet istraživanja, porast frekvencije točke zajedničkog spajanja (PCC) u vjetroelektrani je povratna informacija za aktivne upravljčke petlje za reguliranje aktivne snage vjetroturbine. U isto vrijeme multi-DGs sustav zadržava pozitivan učinak prigušenja na energetski sustav koji omogućuje poboljšanje dinamičkog ponašanja vjetroelektrane. Kao treće, razmatra se učinak vremenskog kašnjenja na funkcioniranje sustava upravljanja te se razmatraju i dokazuju dva prijedloga za rješenje vremenskog zastoja, smatrajući ih ograničenjem za dodatno aktivno upravljanje snagom. Konačno, implimentira se simulacija vremenskog područja i provjerava se točnost predložene metode pomoću root locus analize i simulacije vremenskog područja. Rezultati pokazuju da dodatni regulator snage može značajno poboljšati prigušenje energetskog sustava. Ipak, vjetroelektrana će imati negativno prigušenje i cijeli sustav čak ne će od...
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