Thermal loading of wind power converter considering dynamics of wind speed

Baygildina, Elvira; Peltoniemi, Pasi; Pyrhönen, Olli; Ma, Ke; Blaabjerg, Frede

doi:10.1109/iecon.2013.6699331

“…• The ∆T j magnitude for IGBT and diodes is consistent with those found in [14], but there is greater variation in mean T j between wind speeds in this study.…”

Section: Iet Power Electronicssupporting

confidence: 77%

Impact of wind conditions on thermal loading of PMSG wind turbine power converters

Smith¹,

Crabtree²,

Matthews³

2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

View full text Add to dashboard Cite

Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract: Power converter reliability is critical for permanent magnet synchronous generator (PMSG) wind turbines. Converter failures are linked to power module thermal loading but studies often neglect turbine dynamics, control and the impact of wind speed sampling rate on lifetime estimation. This paper addresses this using a 2MW direct-drive PMSG wind turbine model with a 2-level converter, and simulating junction temperatures (T j ) using a power module thermal equivalent circuit under various synthetic wind speed conditions. These synthetic wind conditions include constant and square wave profiles representing stable and gusty wind conditions. Responses to square wave wind speeds showed that the lower the gust frequency, the higher ∆T j becomes, demonstrating that low turbulence sites have greater thermal variation in the converter. In contrast, wind speed variations with frequencies greater than 0.25Hz deliver only small increases in ∆T j . It is concluded that reasonable approximations of T j profiles can be made with 0.25Hz wind speed data, but that lower data rate wind measurements miss essential, damaging characteristics.

show abstract

“…Moreover, the actual converters are not always working under constant load stresses. If the wind speed is below the nominal speed of the turbine, the output power of the turbine is dependent on the wind speed; the output variation also causes similar variations in the junction temperature [26,27]. In the traditional lifetime models, only the swing and mean of the stress are used in the model, so they cannot explain the effects of stress in the different stages, as proven in the small T j power cycling test.…”

Section: Die-attach Solder Layer Crack Propagation Lifetime Modelmentioning

confidence: 99%

Study on lifetime prediction considering fatigue accumulative effect for die‐attach solder layer in an IGBT module

Lai

¹

,

Chen

²

,

Li

³

et al. 2018

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

An accurate lifetime model is needed in power electronic systems as a cost-effective means of improving reliability and performance assessment, which have long been highly desired to reduce the maintenance cost and to make the product more competitive in the market. Die-attach solder layer fatigue has been identified as one of the root causes of failure of power electronic modules. This paper presents "physics-of-failure lifetime model", which takes fatigue accumulative effect into consideration and can quantify the effect of long-term small-temperature cycling to device fatigue life cycle to estimate the lifetime of the power module. First, small T j power cycling tests were designed to obtain the effects of T j on aged and un-aged modules. They indicated that the traditional lifetime models were not accurate in predicting the lifetime of power modules. Therefore, a new time-domain crack propagation model based on the cumulative damage in the die-attach solder layer is proposed, which includes time-dependent material properties and temperature profiles. Moreover, power cycling experiments and simulations are conducted to demonstrate the method by comparing the number of cycles to failure.

show abstract

“…This approach has been applied in a number of studies to explore the expected reliability of power converters in wind turbines [7][8][9][10][11][12][13][14][15][16]. However, these studies often have limitations.…”

Section: Power Converter Reliability Studiesmentioning

confidence: 99%

“…Some studies have included both realistic wind speed profiles and drive train models [12][13][14][15]. However, only two have studied a PMSG wind turbine [14,15], and these two studies disagree whether high-frequency wind speed events impact the thermal loading of the converter significantly. There is therefore a need for a detailed study into the impact of operating conditions on power converter reliability to help inform how the turbine should be operated in order to extend its life and reduce the LCoE.…”

Section: Power Converter Reliability Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Impact of wind conditions on thermal loading of PMSG wind turbine power converters

Crabtree

¹

,

Matthews

²

2017

IET Power Electronics

View full text Add to dashboard Cite

Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract: Power converter reliability is critical for permanent magnet synchronous generator (PMSG) wind turbines. Converter failures are linked to power module thermal loading but studies often neglect turbine dynamics, control and the impact of wind speed sampling rate on lifetime estimation. This paper addresses this using a 2MW direct-drive PMSG wind turbine model with a 2-level converter, and simulating junction temperatures (T j ) using a power module thermal equivalent circuit under various synthetic wind speed conditions. These synthetic wind conditions include constant and square wave profiles representing stable and gusty wind conditions. Responses to square wave wind speeds showed that the lower the gust frequency, the higher ∆T j becomes, demonstrating that low turbulence sites have greater thermal variation in the converter. In contrast, wind speed variations with frequencies greater than 0.25Hz deliver only small increases in ∆T j . It is concluded that reasonable approximations of T j profiles can be made with 0.25Hz wind speed data, but that lower data rate wind measurements miss essential, damaging characteristics.

show abstract

Thermal loading of wind power converter considering dynamics of wind speed

Cited by 12 publications

References 9 publications

Impact of wind conditions on thermal loading of PMSG wind turbine power converters

Impact of wind conditions on thermal loading of PMSG wind turbine power converters

Study on lifetime prediction considering fatigue accumulative effect for die‐attach solder layer in an IGBT module

Impact of wind conditions on thermal loading of PMSG wind turbine power converters

Contact Info

Product

Resources

About