Extended vector control of doubly fed machine under unbalanced power network conditions

Chomat, M.; Bendl, J.; Schreier, L.

doi:10.1049/cp:20020138

Cited by 18 publications

(12 citation statements)

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“…To eliminate the total reactive power oscillation, the oscillating terms of the reactive power shown in (14) have to be zero, i.e., Q g cos 2 = Q g sin 2 = 0. Thus, the negative sequence current references for the GSC can be calculated as…”

Section: B Gscmentioning

confidence: 99%

“…As a result, the current controller must be carefully tuned to provide the required system response. In [14], an extended vector control of doubly fed machine under unbalanced network conditions was proposed, which was implemented in the positive and negative synchronous reference frames. In [15], the authors investigated the impact of unbalanced stator voltage on the pulsations of stator and rotor currents, electromagnetic torque, and stator active and reactive powers.…”

Section: Introductionmentioning

confidence: 99%

“…In [15], the authors investigated the impact of unbalanced stator voltage on the pulsations of stator and rotor currents, electromagnetic torque, and stator active and reactive powers. Similar to [14], a dual rotor current controller based on the decomposing of positive and negative sequence components was employed to control the rotor positive and negative sequence currents, respectively. Since the decomposing process involves considerable time delay, which brings certain errors in the amplitude and phase, the systems cannot be fully decoupled during transient conditions.…”

Section: Introductionmentioning

confidence: 99%

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Reinforced Control and Operation of DFIG-Based Wind-Power-Generation System Under Unbalanced Grid Voltage Conditions

Hu¹,

He²

2009

IEEE Trans. Energy Convers.

142

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This paper proposes an enhanced control and operation of a doubly fed induction generator (DFIG) based wind power generation system under unbalanced grid voltage conditions. System behaviors of grid-side and rotor-side converters (GSCs and RSCs) are described. The RSC is controlled to eliminate the electromagnetic torque oscillation at double the grid frequency. Meanwhile, three selective control targets for the GSC, i.e., reducing the pulsations in the total active or reactive power, or unbalanced current outputs from the overall system, are identified and analyzed during voltage imbalance. A new current-control scheme is presented for the GSC and RSC without involving the decomposing of positive and negative sequence currents. The controller consists of a proportional (P) regulator and a resonant (R) one tuned at the grid frequency, which is implemented in the stator stationary reference frame. Finally, simulation studies are carried out on a 1.5-MW wind-turbine-driven DFIG system. The validity of the presented current controller and the feasibility of the proposed control targets are all confirmed by the simulated results. Index Terms-Converter, doubly fed induction generator (DFIG), proportional plus resonant (P-R) controller, unbalance, wind power. NOMENCLATUREGSC output voltage and current vectors. V s , V r Stator, rotor voltage vectors. I s , I r Stator, rotor current vectors. ψ s , ψ r Stator, rotor flux linkage vectors. ω s , ω r , ω slip Stator, rotor, and slip angular frequencies. P s , Q s Stator output active and reactive powers. P g , Q g GSC output active and reactive powers. P total , Q total Total active and reactive power outputs from the overall system. L s , L r Stator, rotor self-inductances. L σ s , L σ r Stator, rotor leakage inductances. L m Mutual inductance. R s , R r Stator, rotor resistances. θ s , θ r Stator voltage angle, rotor angle.Subscripts α s , β s Stationary α s β s axis. α r , β r Rotor α r β r axis.

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Section: B Gscmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reinforced Control and Operation of DFIG-Based Wind-Power-Generation System Under Unbalanced Grid Voltage Conditions

Hu¹,

He²

2009

IEEE Trans. Energy Convers.

142

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“…The model of the system consits of the model of the DFM with the mechanical part of the system, based on the space phasor theory, the model of the 12-pulse cycloconverter with the transformer, which has been developed under the assumption of ideal switches and the model of the control unit [4,5]. A 12-pulse cycloconverter without circulating currents with the topology as depicted in Fig.…”

Section: System Under Considerationmentioning

confidence: 99%

Stator and Rotor Current Harmonics in Doubly Fed Machines with Cycloconverter in Rotor Circuit

Bendl¹,

Chomat²,

Schreier³

2024

RE&PQJ

Self Cite

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“…A new speed regulator is proposed in [11] for compensating small asymmetries in weak transmission lines, and the first doubly vector control (DVC) for the positive and negative sequences is presented in [12].…”

Section: Introductionmentioning

confidence: 99%

Direct Power Control of Doubly-Fed-Induction-Generator-Based Wind Turbines Under Unbalanced Grid Voltage

Abad

Rodrı́guez

Iwański

et al. 2010

IEEE Trans. Power Electron.

221

147

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In this paper, the behavior of a doubly fed induction generator (DFIG) is studied under unbalanced grid voltage conditions. It is shown that if no special control efforts are employed, the behavior of the generator is deteriorated, basically due to two reasons: electromagnetic torque oscillations and nonsinusoidal current exchange with the grid. These phenomena are first analyzed theoretically as a function of the stator active and reactive instantaneous power exchange by the stator of the DFIG and the grid-side converter (GSC). This analysis provides the main ideas for generation of the active and reactive power references for the rotor-side converter (RSC) and the GSC, controlled by means of direct power control techniques. Therefore, this paper proposes a new algorithm that generates the RSC power references, without the necessity of a sequence component extraction, in order to eliminate torque oscillations and achieve sinusoidal stator currents exchange. On the contrary, the GSC power references are provided by means of voltage and current sequence extraction. Finally, simulation and experimental results successfully validate the proposed power reference generation methods. Index Terms-Doubly fed induction generator (DFIG), direct power control (DPC), unbalanced voltage. NOMENCLATURE L hMutual inductance. L s , L r Stator and rotor self-inductances. P, Q, S Active, reactive, and apparent powers. R s , R r Stator and rotor resistances. T em Electromagnetic torque. V busVoltage of the dc side of the voltage-source converter (VSC). Ψ, v, i Flux, voltage, and current space vectors. ω s , ω m , ω r Synchronous, rotor, and slip speeds. Superscripts and Subscripts s, r, gStator, rotor, and grid reference frame for space vectors. ). M. A. Rodríguez is with Ingeteam Transmission and Distribution S.A.,

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Extended vector control of doubly fed machine under unbalanced power network conditions

Cited by 18 publications

References 0 publications

Reinforced Control and Operation of DFIG-Based Wind-Power-Generation System Under Unbalanced Grid Voltage Conditions

Reinforced Control and Operation of DFIG-Based Wind-Power-Generation System Under Unbalanced Grid Voltage Conditions

Stator and Rotor Current Harmonics in Doubly Fed Machines with Cycloconverter in Rotor Circuit

Direct Power Control of Doubly-Fed-Induction-Generator-Based Wind Turbines Under Unbalanced Grid Voltage

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