Direct Power Control Applied to Doubly Fed Induction Generator Under Unbalanced Grid Voltage Conditions

Santos-Martín, David; Rodriguez-Amenedo, José Luis; Arnalte, S.

doi:10.1109/tpel.2008.2001907

Cited by 169 publications

(97 citation statements)

References 28 publications

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“…The peak amplitude of the estimated voltage in the rotor when using this strategy can be finally calculated adding the dq components found in (24) and (29). The addition of both vectors gives rise to the following equation that evidence the linear dependence of V r with the fault depth and the relationship with the slip of the machine when the sag occurs.…”

Section: Maximum Amplitude Of the Rotor Voltage Vectormentioning

confidence: 99%

Rotor Voltage Dynamics in the Doubly Fed Induction Generator During Grid Faults

Lima

Luna

Rodriguez

et al. 2010

IEEE Trans. Power Electron.

337

183

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Abstract-This paper presents a new control strategy for the rotor-side converter (RSC) of wind turbines (WTs) based on doubly fed induction generators (DFIG) that intends to improve its low-voltage ride through capability. The main objective of this work is to design an algorithm that would enable the system to control the initial overcurrents that appear in the generator during voltage sags, which can damage the RSC, without tripping it. As a difference with classical solutions, based on the installation of crowbar circuits, this operation mode permits to keep the inverter connected to the generator, something that would permit the injection of power to the grid during the fault, as the new grid codes demand. A theoretical study of the dynamical behavior of the rotor voltage is also developed, in order to show that the voltage at the rotor terminals required for the control strategy implementation remains under controllable limits. In order to validate the proposed control system simulation, results have been collected using PSCAD/EMTDC and experimental tests have been carried out in a scaled prototype.

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Section: Maximum Amplitude Of the Rotor Voltage Vectormentioning

confidence: 99%

Rotor Voltage Dynamics in the Doubly Fed Induction Generator During Grid Faults

Lima

Luna

Rodriguez

et al. 2010

IEEE Trans. Power Electron.

337

183

View full text Add to dashboard Cite

show abstract

“…In these strategies, two hysteresis controllers, namely torque and flux controllers are selected to determine the inverter instantaneous switching state [6]. Similar to the DTC, a direct power control (DPC) of DFIG based wind turbine systems has proposed recently [6][7][8][9][10][11][12][13][14][15]. The instantaneous switching state of the rotor side converter is determined based on the stator active and reactive power errors.…”

Section: Introductionmentioning

confidence: 99%

Sliding mode direct power control of RSC for DFIGs driven by variable speed wind turbines

Shehata

2015

Alexandria Engineering Journal

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In spite of its several advantages, a classic direct power control (DPC) of doubly fed induction generators (DFIGs) driven by variable speed wind turbines has some drawbacks. In this paper, a simple and robust total sliding mode controller (TSMC) is designed to improve the classical DPC performance without complicating the overall scheme. The TSMC is designed to regulate the DFIG stator active and reactive powers. Two integral switching functions are selected for describing the switching surfaces of the active and reactive powers. Reaching phase stability problem of the classical sliding mode controller is avoided in the proposed TSMC. Neither current control loops nor accurate values of machine parameters are required in the proposed scheme. In addition, axes transformation of the stator voltage and current are eliminated. The grid side converter is controlled based on DPC principle to regulate both DC-link voltage and total reactive power. The feasibility of the proposed DPC scheme is validated through simulation studies on a 1.5 MW wind power generation system. The performance of the proposed and conventional DPC schemes is compared under different operating conditions. ª 2015 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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“…However, the control performance was degraded due to a time delay caused by the additional decomposition process. In [7], [8], the direct power control method with prominent features was developed to achieve good compensation results in a DFIG under unbalanced operation. A new method of calculating the stator active and reactive power was proposed in [7] to avoid torque oscillations, whereas [8] developed a new algorithm to achieve a sinusoidal stator current exchange with the grid based on an appropriate power reference generation strategy in the RSC.…”

Section: Introductionmentioning

confidence: 99%

“…In [7], [8], the direct power control method with prominent features was developed to achieve good compensation results in a DFIG under unbalanced operation. A new method of calculating the stator active and reactive power was proposed in [7] to avoid torque oscillations, whereas [8] developed a new algorithm to achieve a sinusoidal stator current exchange with the grid based on an appropriate power reference generation strategy in the RSC. In [9] and [10], the modeling and control of DFIG based on the GSC for unbalanced operation were investigated for both grid-connected and stand-alone applications.…”

Section: Introductionmentioning

confidence: 99%

An Effective Rotor Current Controller for Unbalanced Stand-Alone DFIG Systems in the Rotor Reference Frame

Phan¹,

Lee²,

Chun³

2010

Journal of Power Electronics

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This paper presents an effective rotor current controller for variable-speed stand-alone doubly fed induction generator (DFIG) systems feeding an unbalanced three-phase load. The proposed current controller is developed based on proportional plus two resonant regulators, which are tuned at the positive and negative slip frequencies and implemented in the rotor reference frame without decomposing the positive and negative sequence components of the measured rotor current. In addition, the behavior of the proposed controller is examined in terms of control performance and stability with respect to rotor speed variations, i.e., slip frequency variations. Simulations and experimental results are shown to validate the robustness and effectiveness of the proposed control method.

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Direct Power Control Applied to Doubly Fed Induction Generator Under Unbalanced Grid Voltage Conditions

Cited by 169 publications

References 28 publications

Rotor Voltage Dynamics in the Doubly Fed Induction Generator During Grid Faults

Rotor Voltage Dynamics in the Doubly Fed Induction Generator During Grid Faults

Sliding mode direct power control of RSC for DFIGs driven by variable speed wind turbines

An Effective Rotor Current Controller for Unbalanced Stand-Alone DFIG Systems in the Rotor Reference Frame

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