Control methodology for compensation of grid voltage unbalance using a series-converter scheme for the DFIG

Suppioni, Vinicius P.; Grilo, Ahda P.; Teixeira, Júlio Carlos

doi:10.1016/j.epsr.2015.12.034

Cited by 13 publications

(5 citation statements)

References 19 publications

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“…+ in contrast to the negative component of 𝑉 𝑠(𝑑𝑞) − .The AC component with frequency 2ω is the positive-sequence component, and the DC component is the negative-sequence component. Accordingly, the positive and negative sequence components of current can be obtained by (21).…”

Section: The Serg Analysis Under Abnormal Conditionsmentioning

confidence: 99%

“…The unbalanced voltage can be measured using three definitions based on standards [21], [27] as described below: − The phase voltage unbalance rate (PVUR) definition is given by IEEE Std 141and obtained by (29), where the SERG phase voltages (V a . V b .…”

Section: Unbalanced Voltage Definitionsmentioning

confidence: 99%

“…In contrast, MMF rotates in the opposite direction at synchronous speed for the negative sequence component, resulting in oscillations with double frequency. Regarding the zero-sequence component, it is canceled out, and no MMF in the machine air gap; because of the 120° electric displacement angle between the three-phase stator windings, which have the same angular displacement all time [20], [21]. The unbalanced stator currents produce a ripple torque that causes mechanical stress on the rotor shaft, in addition to the temperature rise of the stator, which degrades the stator winding insulation [22]− [24].…”

Section: Introductionmentioning

confidence: 99%

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Performance analysis of a stand-alone synchronous reluctance generator under unbalanced conditions

Rida

Rashad

Samahy

et al. 2023

IJPEDS

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<span lang="EN-US">A stand-alone self-excited wind energy conversion system (WECS) is considered commonly used in remote areas due to its simple control and low cost. This paper introduces the performance analysis of a stand-alone self-excited reluctance generator (SERG) under balanced and unbalanced operations. An asymmetrical component is proposed to obtain the positive and negative sequence components of voltages and currents in addition to the unbalanced voltage factor of SERG. The obtained results have been validated and compared with experimental results obtained from a laboratory prototype of a 5.5 kW synchronous reluctance generator driven by a dc motor as a prime-mover under unbalanced excitation capacitors and unbalanced loads. The comparison verifies the applicability of the proposed model.</span>

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Section: The Serg Analysis Under Abnormal Conditionsmentioning

confidence: 99%

Section: Unbalanced Voltage Definitionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance analysis of a stand-alone synchronous reluctance generator under unbalanced conditions

Rida

Rashad

Samahy

et al. 2023

IJPEDS

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“…However, the increasing penetration of wind power brings more complex challenges to the connected system [4,5]. Long-distance and large-capacity high voltage transmission technology is generally adopted for wind farms which are located at the ends of the grid with an insufficient support capacity of the voltage [6,7]. The random fluctuation of wind speed and the impact load may lead to the voltage change at the point of common coupling (PCC) of the wind farm, the decrease in power quality, and the increase in equipment operation risk, which seriously threaten the voltage stability of the grid [8].…”

Section: Introductionmentioning

confidence: 99%

An Active Voltage Coordinate Control Strategy of DFIG-Based Wind Farm with Hybrid Energy Storage System

et al. 2021

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In a power system with wind farms, the point of common coupling (PCC) usually suffers from voltage instability under large wind speed variations and the load impact. Using the internal converter of a doubly fed induction generator (DFIG)-based wind turbine to provide voltage support auxiliary service is an effective scheme to suppress the voltage fluctuation at PCC. To satisfy the reactive power demand of the connected grid, an active voltage coordinate control strategy with the hybrid energy storage system of the wind farm is proposed. The dynamic reactive power balance model is established to show the interaction between the reactive power limitation of the wind farm and the reactive power compensation demand of the grid. This indicates the initial conditions of the active voltage coordinate control strategy. According to the critical operating point and the operation state of the DFIG, the active and reactive power coordinate control strategy composed of active ω-β coordinate control and active β control is proposed to enhance the reactive power support capability and stabilize the grid voltage. To compensate the active power shortage, an auxiliary control strategy based on the hybrid energy storage system is introduced. The simulation results show that the proposed strategy can suppress the voltage fluctuation effectively and make full use of primary energy.

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“…Because this amount of power is significant, the effects of the harmonic distortion introduced by the B2B power converter toward the electrical grid are critical, so that special concerns are focused on power electronics. The DFIG interconnected to an electrical grid is commonly studied for load flow analysis [4][5][6][7][8][9], disturbances in the electrical grid [10][11][12][13][14][15], stability [16][17][18][19][20], and voltage variation [21][22][23][24], with very few studies on harmonic propagation. For example, a second-order model for the prediction of the response of a DFIG wind turbine to grid disturbances is simulated and verified experimentally.…”

Section: Introductionmentioning

confidence: 99%

Modelling and Validation of a Grid-Connected DFIG by Exploiting the Frequency-Domain Harmonic Analysis

Hernández-Mayoral

Iracheta-Cortez²,

Lecheppe

et al. 2020

Applied Sciences

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Wind Energy Conversion Systems (WECS) based on a Doubly-Fed Induction Generator (DFIG) represent the most common configuration employed in wind turbines. These systems involve injecting harmonic currents toward an electrical grid from a back-to-back power converter, potentially creating voltage distortions. To assess this phenomenon, a case study of a 3 kW DFIG-based wind turbine connected to the electrical grid is presented for analysis in the harmonic domain. Initially, a DFIG-based load flow analysis for determining the operating conditions is tackled at the fundamental frequency. Then, the modelling of a DFIG under steady-state operating conditions at harmonic frequencies is analyzed discussing its characteristics in the harmonic domain. The high-frequency harmonics in the output voltage of a pulse width modulation-driven inverter feeding the rotor windings of a DFIG and its connection to a three-winding transformer are also analyzed. This investigation produced a complete model of the DFIG connected to the electrical grid. The results demonstrated that although a considerable harmonic contribution up to the 25th order exists, it remains harmless since it is below 5%, according to the Std. IEEE 519.

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Control methodology for compensation of grid voltage unbalance using a series-converter scheme for the DFIG

Cited by 13 publications

References 19 publications

Performance analysis of a stand-alone synchronous reluctance generator under unbalanced conditions

Performance analysis of a stand-alone synchronous reluctance generator under unbalanced conditions

An Active Voltage Coordinate Control Strategy of DFIG-Based Wind Farm with Hybrid Energy Storage System

Modelling and Validation of a Grid-Connected DFIG by Exploiting the Frequency-Domain Harmonic Analysis

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