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This paper proposes an advanced strategy to synchronize the wind-driven Brushless Doubly-Fed Reluctance Generator (BDFRG) to the grid-side terminals. The proposed strategy depends mainly upon determining the electrical angle of the grid voltage, θv and using the same transformation matrix of both the power winding and grid sides to ensure that the generated power-winding voltage has the same phase-sequence of the grid-side voltage. On the other hand, the paper proposes a vector-control (power-winding flux orientation) technique for maximum wind-power extraction under two schemes summarized as; unity power-factor operation and minimum converter-current. Moreover, a soft-starting method is suggested to avoid the employed converter over-current. The first control scheme is achieved by adjusting the command power-winding reactive power at zero for a unity power-factor operation. However, the second scheme depends on setting the command d-axis control-winding current at zero to maximize the ratio of the generator electromagnetic-torque per the converter current. This enables the system to get a certain command torque under minimum converter current. A sample of the obtained simulation and experimental results is presented to check the effectiveness of the proposed control strategies.
Mohamed G. Mousa; Said M. Allam; Essam M. Rashad. Maximum power extraction under different vector-control schemes and grid-synchronization strategy of a wind-driven Brushless Doubly-Fed Reluctance Generator. ISA Transactions 2018, 72, 287 -297.
AMA StyleMohamed G. Mousa, Said M. Allam, Essam M. Rashad. Maximum power extraction under different vector-control schemes and grid-synchronization strategy of a wind-driven Brushless Doubly-Fed Reluctance Generator. ISA Transactions. 2018; 72 ():287-297.
Chicago/Turabian StyleMohamed G. Mousa; Said M. Allam; Essam M. Rashad. 2018. "Maximum power extraction under different vector-control schemes and grid-synchronization strategy of a wind-driven Brushless Doubly-Fed Reluctance Generator." ISA Transactions 72, no. : 287-297.
This paper presents a scalar volt per hertz (V/f) control technique for maximum power tracking of a grid-connected wind-driven brushless doubly fed reluctance generator (BDFRG). The proposed generator has two stator windings namely; power winding, directly connected to the grid and control winding, connected to the grid through a bi-directional converter. In order to enhance the performance of the proposed scalar-control strategy, a soft starting method is suggested to avoid the over-current of the bi-directional converter. Moreover, the capability of generator speed estimation for sensorless control is also studied. The capability of the proposed scalar-control technique is validated using a sample of simulation results. In addition, the presented simulation results ensure the effectiveness of the proposed control strategy for maximum wind-power extraction under wind-speed variations. Furthermore, the results show that the estimated generator speed is in a good accordance with the actual generator speed which supports sensorless control capability.
Mohamed G. Mousa; S. M. Allam; Essam M. Rashad. Sensored and sensorless scalar-control strategy of a wind-driven BDFRG for maximum wind-power extraction. Journal of Control and Decision 2017, 5, 209 -227.
AMA StyleMohamed G. Mousa, S. M. Allam, Essam M. Rashad. Sensored and sensorless scalar-control strategy of a wind-driven BDFRG for maximum wind-power extraction. Journal of Control and Decision. 2017; 5 (2):209-227.
Chicago/Turabian StyleMohamed G. Mousa; S. M. Allam; Essam M. Rashad. 2017. "Sensored and sensorless scalar-control strategy of a wind-driven BDFRG for maximum wind-power extraction." Journal of Control and Decision 5, no. 2: 209-227.
This paper proposes a vector-control technique of a grid-connected wind-driven Brushless Doubly Fed Reluctance Generator (BDFRG) for maximum wind-power extraction under three strategies, summarised as unity power-factor operation, minimum converter current and minimum copper losses. The adopted generator has two stator windings namely; power winding, directly connected to the grid, and control winding, connected to the grid through a bi-directional converter. In addition, a soft starting method is suggested to avoid the employed converter over-current. The first control strategy can be achieved by adjusting the command power-winding reactive power at zero for a unity power-factor operation. However, the second strategy depends on setting the command d-axis control-winding current at zero to maximise the ratio of the generator electromagnetic-torque per the converter current. This enables the system to get a certain command torque under minimum converter current. On the other hand, the third strategy can be realised by determining the control-winding current angle at which the BDFRG can operate with minimum copper losses. A sample of the obtained simulation results is presented to check the effectiveness of the proposed control strategies.
Mohamed G. Mousa; S. M. Allam; Essam M. Rashad. A comparative study of vector-control strategies for maximum wind-power extraction of a grid-connected wind-driven brushless doubly-fed reluctance generator. Australian Journal of Electrical and Electronics Engineering 2017, 14, 1 -11.
AMA StyleMohamed G. Mousa, S. M. Allam, Essam M. Rashad. A comparative study of vector-control strategies for maximum wind-power extraction of a grid-connected wind-driven brushless doubly-fed reluctance generator. Australian Journal of Electrical and Electronics Engineering. 2017; 14 (1-2):1-11.
Chicago/Turabian StyleMohamed G. Mousa; S. M. Allam; Essam M. Rashad. 2017. "A comparative study of vector-control strategies for maximum wind-power extraction of a grid-connected wind-driven brushless doubly-fed reluctance generator." Australian Journal of Electrical and Electronics Engineering 14, no. 1-2: 1-11.