Conference programme

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Delegates are invited to meet and discuss with the poster presenters during the poster presentation sessions between 10:30-11:30 and 16:00-17:00 on Thursday, 19 November 2015.

Lead Session Chair:
Stephan Barth, ForWind - Center for Wind Energy Research, Germany
Di Li WindSim AS, Norway
Meissner Catherine (1) F Anderson Phillip (3) Gentle jake (2)
(1) WindSim AS, Tønsberg, Norway (2) Idaho National Laboratory, Idaho Falls, United States (3) Idaho Power, Boise, United States

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2015 and are published here unedited

Di Li, wants to leave the world better than he found it, it's why he works timely with passion and innovation, to reduce the impact on climate change.

As Wind Service Manager, he has always been working on making uncertainty certain. With knowledge, reliability and experience gained from hundreds of wind farms in more than 30 countries, and from prestigious Royal Institute of Technology in Stockholm, his clients witness unbelievable detail to build and maintain their wind farms on an unbelievable scale.


Poster Award Winner Poster Download poster (11.48 MB)


Increasing Transmission Capacities by dynamic line rating based on CFD


Transmission lines maximum capacity is traditionally limited by the conductor thermal capacity. The thermal capacity is normally defined by a static rating using predetermined environmental conditions. Without accurately measuring environmental conditions and their effects, existing transmission lines can be critically underutilized.
Using a dynamic line rating system to accurately monitor the environmental conditions, and to transfer those conditions to every point along the electricity line, leads to improved line ampacity ratings.


The transfer of environmental conditions, like wind speed and wind direction, is done with the computational fluid dynamics (CFD) model WindSim. A three-dimensional flow model is developed for the transmission line area, and the results of the steady-state simulation are used to transfer the measurements from the weather stations along the transmission line onto the whole length of the transmission line, providing an end-to-end high fidelity monitoring solution. Knowing the wind speed and direction at every span, the conductor thermal capacity can be calculated very precisely; the capacity of the line can often be increased compared to the standard approach of using static line ratings based on near worst case weather conditions.

Main body of abstract

Idaho National Laboratory has done a thorough validation of the method with field-testing with Idaho Power, and the results will be presented in this study. The strength and weakness of using CFD for dynamic line rating will be discussed, and the set-up of the CFD simulations will be explained.


Using CFD for dynamic line rating has shown that the transmission line capacity can be increased by up to 40% by using a dynamic line rating approach compared to the industry standard.

Learning objectives
The audience will learn how dynamic line rating can increase the capacity of transmission lines.
The audience will understand how micro scale CFD modeling can be used for dynamic line rating.
The audience will get an understanding of the added value of the found solution for the grid operators.