Effective Direct Power Control for a Sensor-Less Doubly Fed Induction Generator with a Losses Minimization Criterion

Abstract

The present paper is concerned with introducing an effective direct power control (DPC) approach for a sensor-less doubly fed induction generator (DFIG). The derivation of the proposed DPC approach is performed in a systematic manner in which the design of the rotor current controllers is well analyzed, which clarifies the real base of the control system as when and why it works properly. The operation of the proposed DPC approach is based on the stator voltage-oriented control principle in which the stator voltage is aligned with the quadrature axis of the rotating reference frame. To obtain maximum generation efficiency, the reactive power reference value is derived based on a loss minimization criterion (LMC) that is described and analyzed in detail. To enhance the robustness of the control system, an effective rotor position estimator is proposed that is robust against the system uncertainties, such as the parameters’ variation. To validate the effectiveness of the proposed sensor-less DPC approach, the DFIG dynamic performance is tested for a wide range of operating speeds. The obtained results confirm and emphasize the feasibility of the proposed control approach and its LMC methodology in improving the generation efficiency and in obtaining high dynamic performance from the DFIG.

Improving the Dynamic Performance of a Variable Speed DFIG for Energy Conversion Purposes Using an Effective Control System

“…Due to the several advantages of the DFIG as a generation unit, researchers have made great efforts to develop various control techniques and then test them with the DFIG. In [21][22][23][24][25], the vector orientation control (VOC) technique is performed, while in [26][27][28], the direct torque control (DTC) technique is used. The VOC technique has been performed in various configurations according to the selected variable to be aligned with the direct (d) axis of the rotating synchronous frame.…”

“…The VOC technique has been performed in various configurations according to the selected variable to be aligned with the direct (d) axis of the rotating synchronous frame. For instance, in [21], the stator field was chosen to rotate with a speed equal to that of the synchronous frame, while in [22], the stator voltage was chosen to be aligned with the direct axis of the synchronous frame. In [23][24][25], the rotor field was chosen to be oriented in the same direction as the direct axis of the rotating frame.…”

Performance Enhancement of a Hybrid Renewable Energy System Accompanied with Energy Storage Unit Using Effective Control System

“…But on the other hand, they suffered from the need for a separate excitation source. After that, the doubly-fed induction generator (DFIG) came into consideration [22][23][24][25], which possessed several merits, such as using power converters with a lower rating which saves the cost, in addition to the ability to ride through the fault occurrence. However, the DFIG suffered from the high maintenance cost and reduced efficiency due to the copper losses.…”

A Synergetic Sliding Mode Controller Applied to Direct Field-Oriented Control of Induction Generator-Based Variable Speed Dual-Rotor Wind Turbines

“…Most of the presented techniques for power control of induction generators are based on pulse-width modulation (PWM) and use proportionalintegral (PI) regulators. There is another strategy similar to DTC control that relies on direct control of the reactive and active power of the induction generator, and this is by using two hysteresis controllers and one lookup table [9]. In [10], the reactive and active power ripple minimization is achieved by using neural algorithms.…”