Abstract
With an aim to improve the transient stability of a DFIG wind farm penetrated multimachine power system (MPN), an adaptive fractional integral terminal sliding mode power control (AFITSMPC) strategy has been proposed for the unified power flow controller (UPFC), which is compensating the MPN. The proposed AFITSMPC controls the dq- axis series injected voltage, which controls the admittance model (AM) of the UPFC. As a result the power output of the DFIG stabilizes which helps in maintaining the equilibrium between the electrical and mechanical power of the nearby generators. Subsequently the rotor angular deviation of the respective generators gets recovered, which significantly stabilizes the MPN. The proposed AFITSMPC for the admittance model of the UPFC has been validated in a DFIG wind farm penetrated 2 area 4 machine power system in the MATLAB environment. The robustness and efficacy of the proposed control strategy of the UPFC, in contrast to the conventional PI control is vindicated under a number of intrinsic operating conditions, and the results analyzed are satisfactory.
Highlights
The increase in the penetration of wind power, especially from doubly fed induction generator based wind farms into the existing power grids, is beneficial, but has significant pessimistic impacts [1] such as voltage and frequency control, power transfer capability, transient stability, etc
Further it is noted that the computational complexity associated with the dynamics of the network components, i.e., transformers, exciters, transmission lines, converters, etc., is very much high for MPN simulation, and following the IEEE 1547 norms and [15], they have been neglected in this paper
An adaptive fractional integral terminal sliding mode power control strategy of the admittance model (AM) of the Unified Power Flow Controllers (UPFC), in order to damp out the oscillation between the generators in a DFIG wind farm penetrated multimachine power system is proposed in this paper
Summary
The increase in the penetration of wind power, especially from doubly fed induction generator based wind farms into the existing power grids, is beneficial, but has significant pessimistic impacts [1] such as voltage and frequency control, power transfer capability, transient stability, etc. The application of the Flexible AC Transmission System (FACTS) devices, such as Unified Power Flow Controllers (UPFC) along with the PSS has illustrated excellent results, especially for improving the oscillations exhibited by the power system components [3]. Adding to it, they control both the active. The proportional-integral (PI) control is one of the effective conventional controller for the UPFC [9], but its performance is unreliable under some of the intermittent operating conditions (DFIG based wind farms) [10].
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