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Access type: UnknownSubject: search.filters.subject.Doubly fed induction generator

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    Enhanced direct reactive power control-based multi-level inverter for dfig wind system under variable speeds
    (2021-08-02)
    Tamalouzt, Salah
    ;
    Belkhier, Youcef
    ;
    Sahri, Younes
    ;
    Bajaj, Mohit
    ;
    Ullah, Nasim
    A novel direct reactive power control strategy based on the three-level inverter topology (DRPC-3N) is proposed for a doubly fed induction generator (DFIG)-based wind power plant system. The robustness against parametric variations and control performances of the presented methodology are analyzed under random wind speeds, taking into account the effect of the heating of the windings as well as the saturation of the magnetic circuit. The performance indices include obtaining a sinusoidal AC-generated current with low THD and less ripples in the output. Moreover, the generator can be considered as a reactive power compensator, which allows for the controlling of the active and reactive power of the stator side connected directly to the grid side using only the rotor converter. In this study, unpredictable conduct of the wind velocity that forces the DFIG to operate through all modes of operation in a continual and successive way is considered. The received wind power is utilized to extract the optimum power by using an appropriate MPPT algorithm, and the pitch angle control is activated during the overspeed to restrict the produced active power. The simulation tests are performed under Matlab/Simulink and the presented results show the robustness and effectiveness of the new DRPC strategy with the proposed topology, which means that the performances are more sophisticated.
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    Robust power oscillation damper design for DFIG-based wind turbine based on specified structure mixed H2/H∞ control
    (2014-01-01)
    Surinkaew, Tossaporn
    ;
    Ngamroo, Issarachai
    As the integration of a doubly fed induction generator (DFIG)-based wind power generation into power systems tends to increase significantly, the contribution of DFIG wind turbine is highly expected. Since the active and reactive power outputs of DFIG can be independently modulated, the stabilizing effect of DFIG on the inter-area power system oscillation is a challenging issue. This paper proposes a new robust control design of power oscillation damper (POD) for a DFIG-based wind turbine using a specified structure mixed H<inf>2</inf>/H<inf>∞</inf> control. The POD structure is a practical 2nd-order lead-lag compensator with single input. Normally, H<inf>∞</inf> control mainly enforces the closed-loop stability while noise attenuation or regulation against random disturbances is expressed in H<inf>2</inf> control. As a result, the mixed H<inf>2</inf>/H<inf>∞</inf> control gives a powerful multi-objective control design so that both closed-loop stability and performance of designed controller can be guaranteed. Here, the linear matrix inequality is applied to formulate the optimization problem of POD based on a mixed H<inf>2</inf>/H<inf>∞</inf> control. The POD parameters are optimized so that the performance and robustness of the POD against system disturbances and uncertainties are maximal. The firefly algorithm is automatically applied to solve the optimization problem. Simulation study in a two-area four-machine interconnected power system shows that the DFIG with robust POD is superior to conventional POD in terms of stabilizing effect as well as robustness against various power generating and loading conditions, unpredictable network structure, and random wind patterns. © 2013.