Direct Power Control of Doubly Fed Induction Generator Without Phase-Locked Loop Under Harmonically Distorted Voltage Conditions

Nian, Heng; Li, Longqi

doi:10.1109/tpel.2017.2740265

Cited by 33 publications

(12 citation statements)

References 26 publications

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“…Since the active and reactive power control is achieved through rotor side, the stator currents in (7) and (8) can be replaced with rotor currents using (3).…”

Section: B Active and Reactive Powermentioning

confidence: 99%

“…V s = R sĪs + jω sΛs (10) If R sĪs ω sΛs , then the stator voltage's dq components can be approximated as: v qs ≈ |v g | and v ds ≈ 0, wherev g is the instantaneous grid voltage vector. Thus, after substituting (9) into (7) and (8), the stator active and reactive power in terms of grid voltage vector and rotor currents will be:…”

Section: B Active and Reactive Powermentioning

confidence: 99%

“…They allow to downsize the power electronic converter required for four-quadrant active and reactive power control. The direct power control of a doubly fed induction machine (DFIM) is widely researched [2]- [7] in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…In these works [8], [9], however, the switching frequency is not constant. A similar work is presented in [7] where the phase locked loop (PLL) is excluded for its vulnerability to grid harmonics which appear in angle estimation. A second-order vector integration is employed as direct resonant controller to remove fifth and seventh harmonics to render the currents as smooth sinusoids and minimize ripples in power and consequently in shaft torque.…”

Section: Introductionmentioning

confidence: 99%

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Modulated Model Predictive Direct Power Control of DFIM Considering Magnetic Saturation Effects

Odhano

Zanchetta

Rubino

et al. 2018

2018 IEEE Energy Conversion Congress and Exposition (ECCE)

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In this paper, an optimal voltage vector based model predictive control strategy is investigated for the direct power control of a doubly fed induction machine. The model predictive control computes optimal voltage vector that minimizes the error in active and reactive power. The computed voltage vector, if within the linear regulation range, is passed onto a modulator to be applied in the next sampling instant. In the over-modulation range the voltage vector is linearly scaled down, before modulation, to maintain optimality. The paper also focuses on the saturation of main flux inside an induction machine and its impact on reactive power control when stator current sensors are not installed. The machine's saturation characteristic is fully utilized to realize full-state stator flux observer that is used to estimate stator currents which give accurate prediction of reactive power. Consequently, stator current sensors can be excluded. Simulations and experimental analyses are conducted on a test machine to verify fast dynamics of predictive control and the estimation accuracy of stator current. Index Terms-direct power control, doubly fed induction machine, magnetic saturation, modulated model predictive control

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“…Since the active and reactive power control is achieved through rotor side, the stator currents in (7) and (8) can be replaced with rotor currents using (3).…”

Section: B Active and Reactive Powermentioning

confidence: 99%

Section: B Active and Reactive Powermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modulated Model Predictive Direct Power Control of DFIM Considering Magnetic Saturation Effects

Odhano

Zanchetta

Rubino

et al. 2018

2018 IEEE Energy Conversion Congress and Exposition (ECCE)

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show abstract

“…However, it may incur additional computational burden. In addition, Cheng and Nian proposed a virtual synchronous reference frame based DPC for VSI in [44] and extended it to doubly fed induction generator system with consideration of unbalance grid voltage and harmonically distorted voltage conditions [45], [46]. They used a virtual phase angle instead of the voltage phase angle acquired by PLL for coordinate transformations, and apply the reduced-order vector integrators to directly regulate the power pulsations.…”

Section: Introductionmentioning

confidence: 99%

Vector Current Control Derived from Direct Power Control for Grid-Connected Inverters

Gui

Wang

Blaabjerg

2019

IEEE Trans. Power Electron.

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We propose a vector current control derived from direct power control (VCC-DPC) for a three-phase voltage source inverter (VSI) in the synchronous rotating frame through instantaneous real and reactive powers. The proposed VCC-DPC method has the same control structure as the conventional VCC except for the coordinate transformation, since we obtain the d-q axes currents model of VSI without using Park transformation and the PLL system. Consequently, the proposed method has the same property as the conventional VCC if the PLL extracts the phase angle of the grid voltage correctly. However, with the consideration of the slow dynamics of the PLL, the proposed method has an enhanced dynamical performance feature compared with the conventional VCC. Moreover, it has another benefit that the reduction of the computational burden could be expected since there is no Park transformation and the PLL in the controller implementation. We can guarantee that the closed-loop system with the proposed method is exponentially stable in the operating range. Finally, both simulation and experimental results using a 15-kW-inverter system match the theoretical expectations closely. Index Terms-Voltage source inverter, vector current controller, instantaneous real and reactive powers, exponentially stable.

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Power Harmonic Suppression based direct vector control for robust DFIG operation during grid voltage distortions

Bala Krishna,

Asha Rani

2024

Circuit Theory & Apps

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This paper proposes a Power Harmonic Suppression (Damping) (PHS) based reference current generation scheme, which focuses on simultaneous mitigation of harmonic pulsations in electromagnetic torque, stator real and reactive powers, and DC‐link voltage while retaining sinusoidal stator and grid currents and unity power factor at grid side. The crux of this PHS method lies in its ability to eliminate the harmonic powers developed in the DFIG stator and grid at 100Hz, 200Hz, 300Hz, 400Hz, and 600 Hz owing to second, fifth, and seventh harmonic grid voltages. This is achieved as a result of the elimination of natural fluxes developed in the DFIG air gap due to second, fifth, and seventh harmonic distortions in grid voltage. For this, a single concurrent reference current generation technique is developed for RSC and GSC to mitigate the oscillations of electromagnetic torque, stator real and reactive powers, and ripples in DC‐link voltage. Further, the reference rotor currents (positive, negative, fifth, and seventh sequence) are compared with the actual rotor currents using a PI controller to retain sinusoidal stator and grid currents. The proposed scheme's efficacy is validated with PSCAD/EMTDC simulations and using OPAL‐RT OP4510 real‐time simulator, on a 2.3 kVA DFIG.

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Direct Power Control of Doubly Fed Induction Generator Without Phase-Locked Loop Under Harmonically Distorted Voltage Conditions

Cited by 33 publications

References 26 publications

Modulated Model Predictive Direct Power Control of DFIM Considering Magnetic Saturation Effects

Modulated Model Predictive Direct Power Control of DFIM Considering Magnetic Saturation Effects

Vector Current Control Derived from Direct Power Control for Grid-Connected Inverters

Power Harmonic Suppression based direct vector control for robust DFIG operation during grid voltage distortions

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