Improving the Reactive Power Capability of the DFIG-Based Wind Turbine During Operation Around the Synchronous Speed

Sujod, Muhamad Zahim; Erlich, I.; Engelhardt, Stephan

doi:10.1109/tec.2013.2272975

Cited by 42 publications

(28 citation statements)

References 19 publications

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“…A converter of higher rating and a heat sink of lower maximum temperature can be a solution, but additional investment and larger space is required. Authors in [12] proposed a different converter topology to decrease the power loss and thus reduce the risk of overheating, which may not be the preferable solution for D WECS manufacturers due to high cost and space constraints [7]. The authors of [7] suggested the use of a discontinuous PWM technique to reduce power loss of the DFIG and thus the maximum junction temperature, enabling the generator to operate within the entire speed range.…”

Section: Limitations In Existing Control Strategiesmentioning

confidence: 99%

“…Authors in [12] proposed a different converter topology to decrease the power loss and thus reduce the risk of overheating, which may not be the preferable solution for D WECS manufacturers due to high cost and space constraints [7]. The authors of [7] suggested the use of a discontinuous PWM technique to reduce power loss of the DFIG and thus the maximum junction temperature, enabling the generator to operate within the entire speed range. In [13], the authors found that the mean time to failure (MTTF) of the IGBTs in a variable speed drive system reduces dramatically at higher junction temperature variation, and a switching frequency reduction strategy was proposed in order to reduce the power loss under low output frequency operation, thus improving MTTF.…”

Section: Limitations In Existing Control Strategiesmentioning

confidence: 99%

“…Furthermore, there is a common limitation in existing control strategies, since the solutions are mainly capable of reducing the mean junction temperature but have limited impact on reducing the temperature swings which is mainly affected by the fundamental output frequency. As mentioned in [7,11], another solution is to avoid synchronous operation in practical applications. In [14], an unstable section replaces the typical MPPT curve around synchronous speed.…”

Section: Limitations In Existing Control Strategiesmentioning

confidence: 99%

“…It is also recommended in [10] that derating of the converter is necessary when rotor frequencies are lower than 0.1 p.u. Otherwise, the relationship between the junction temperature and rotor current frequencies should be determined through an experiment as outlined in [7,18] to set the value for ε. In this paper, since the DFIG is operating at unity power factor, the rotor current is less than its rated value (as used in the case where ε is set at 0.1 p.u.)…”

Section: B Proposed Multi-mode Operationmentioning

confidence: 99%

“…In [6], the variation of the semiconductor junction temperature was shown to be reaching its maximum around the synchronous speed when the slip is low and the period of thermal cycle is long. The authors in [7] also suggested that the maximum junction temperature in the IGBTs of the RSC are likely to be exceeded around synchronous speed. A power cycling capability estimation method was proposed for the DFIG in [8] and the negative effect of low slip frequency operation on power cycle capability of a DFIG power converter was studied.…”

Section: Introductionmentioning

confidence: 99%

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Deadband Control of Doubly-Fed Induction Generator Around Synchronous Speed

Tan

Muttaqi

Meegahapola³

et al. 2016

IEEE Trans. Energy Convers.

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Semiconductor devices in power electronic converters of the doubly-fed induction generator (DFIG) are susceptible to significant junction temperature variations when operating around synchronous speed, thereby reducing the lifetime of the converters. This is due to the fact that the frequency of the rotor current in a DFIG is determined by the stator flux frequency and rotor speed, and hence will lead to low rotor current frequency when operating closer to the synchronous speed, and ultimately result in significant thermal stress on semiconductor devices. In this paper, a multimode operation control strategy is proposed for the DFIG to prevent operating around the synchronous speed (within a predefined deadband); thus, the proposed control strategy can avoid the thermal stress problem. The proposed strategy engages the existing crowbar scheme for DFIG-based wind energy conversion system to intentionally alter the operating mode of the generator between DFIG and induction generator (IG). Smooth transition between the two operating modes can be achieved with the supplementary control strategies. Unity power factor can also be maintained in both operating modes by using the grid side converter as a static synchronous compensator (STATCOM) to fulfill the reactive power requirement of the DFIG in IG mode. Abstract-Semiconductor devices in power electronic converters of the doubly-fed induction generator (DFIG) are susceptible to significant junction temperature variations when operating around synchronous speed, thereby reducing the lifetime of the converters. This is due to the fact that the frequency of the rotor current in a DFIG is determined by the stator flux frequency and rotor speed, and hence will lead to low rotor current frequency when operating closer to the synchronous speed, and ultimately result in significant thermal stress on semiconductor devices. In this paper, a multimode operation control strategy is proposed for the DFIG to prevent operating around the synchronous speed (within a predefined deadband), thus the proposed control strategy can avoid the thermal stress problem. The proposed strategy engages the existing crowbar scheme for DFIG based WECS to intentionally alter the operating mode of the generator between DFIG and induction generator (IG). Smooth transition between the two operating modes can be achieved with the supplementary control strategies. Unity power factor can also be maintained in both operating modes by using the grid side converter as a static synchronous compensator (STATCOM) to fulfil the reactive power requirement of the DFIG in IG mode.Index Terms-Crowbar, doubly-fed induction generator (DFIG), multimode operation, synchronous speed, wind power, thermal analysis.

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Section: Limitations In Existing Control Strategiesmentioning

confidence: 99%

Section: Limitations In Existing Control Strategiesmentioning

confidence: 99%

Section: Limitations In Existing Control Strategiesmentioning

confidence: 99%

Section: B Proposed Multi-mode Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Deadband Control of Doubly-Fed Induction Generator Around Synchronous Speed

Tan

Muttaqi

Meegahapola³

et al. 2016

IEEE Trans. Energy Convers.

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Passivity-based power control of a doubly fed induction generator with unknown parameters

Lopez-Garcia

Beltrán-Carbajal

Espinosa-Pérez

et al. 2016

Int. Trans. Electr. Energ. Syst.

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Summary An alternative solution for power regulation of doubly fed induction generators is proposed in this work by a proper combination of passivity‐based controllers with algebraic approaches for online estimation of system parameters and mechanical torque. Our proposal shows that the stability property of the original closed‐loop system is preserved, without the restriction of explicitly knowing the parameters and mechanical torque of the induction generator. A performance evaluation study is performed on the passivity‐based power control scheme considering typical/normal operation conditions for the electrical power generation system, namely active power generation with either demanded or delivered reactive power. Analytical and numerical results prove the effectiveness of the power control scheme combined with the proposed real‐time estimators of parameters and torque. Copyright © 2016 John Wiley & Sons, Ltd.

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Towards reactive power dispatch within a wind farm using hybrid PSO

Bhaskar

Singh

2015

International Journal of Electrical Power & Energy Systems

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Improving the Reactive Power Capability of the DFIG-Based Wind Turbine During Operation Around the Synchronous Speed

Cited by 42 publications

References 19 publications

Deadband Control of Doubly-Fed Induction Generator Around Synchronous Speed

Deadband Control of Doubly-Fed Induction Generator Around Synchronous Speed

Passivity-based power control of a doubly fed induction generator with unknown parameters

Towards reactive power dispatch within a wind farm using hybrid PSO

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