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Machine speed is usually required for maximum power point tracking (MPPT) control of permanent-magnet synchronous generators (PMSG). In this paper, a sensorless control method is applied to the PMSG for micro wind turbine systems. The machine speed is estimated by using a rotor flux observer and induced EMF signal, which can solve the delay problem of the estimated speed. For vector control of PMSG...
This paper proposes a control scheme which can eliminate the torque ripple of the DFIM at unbalanced source voltage. The machine torque is expressed using the positive and negative sequence components of the voltage and current. For suppression of the torque ripple, the stator reactive power ripple is controlled to be zero. The proposed torque elimination method is verified by simulation results using...
In this paper, a novel control algorithm for minimizing the operating loss of doubly fed induction generators (DFIG) for variable speed wind turbines is presented. At first, the generator losses are modeled, which consist of the copper loss and the iron losses. Then, a stator d-axis current is derived which minimizes the total generator loss. Based on this current, the stator reactive power level...
This paper proposes a low-cost power converter for micro wind turbine systems using permanent magnet synchronous generators (PMSG). The proposed converter consists of a two-leg three-phase PWM inverter for the generator control and a single-phase half-bridge PWM converter which is connected to the utility grid. For the two separate DC-link voltages, a balancing control is added and the adverse effect...
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