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BWE Industry Report - Wind Industry in Germany 2020

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- An overview of the German wind industry - Leading companies in the sector present their products and services - Around 400 addresses - easy access to the riht contact - NEW: Including Innovative Projects and Start-ups

INNOVATIVE PROJECTS for

INNOVATIVE PROJECTS for the German wind market FLYING WIND MEASURING SYSTEM Complex terrain and the resulting wind conditions can lead to unexpected yield losses at the wind farm. The WindLocator flying measuring system developed at the Center for Wind Power Drives in Aachen provides planning security. Motivation The annual wind energy yields of individual turbines within a wind farm in complex terrain can vary by up to 30%. One reason for this are wind phenomena, which can lead to local differences in the mean wind speed of up to 45%, e.g. due to steep ledges or obstacles (own measurement, Fig. 1). Increased planning reliability, therefore, requires a deeper understanding of the local wind conditions. Various methods are currently used to investigate these. Directive-compliant measuring systems (measuring mast, LIDAR, SODAR) offer statistical security, but are simply too immobile to produce spatially resolved insights. CFD simulations provide high spatial resolution, but are time-consuming and have large error potential due to complex boundary conditions. The measuring system The WindLocator consists of three main components: the flying carrier system, a 3D ultrasonic anemometer and an integrated analysis module. It is based on a high-performance carrier system, which enables accurate position control at all relevant wind speeds (at peak wind speeds of up to 25m/s). The GPS system facilitates the flexible planning of flight routes and measuring points, which can be approached autonomously and thus repeatably. „With our system, we want to provide better insight into the local wind conditions on a scientific basis. This enables us to make a quick and cost-effective contribution to optimising the yields of our customers’ wind farms.” Christian Ingenhorst, project manager in charge The CWD WindLocator flying measuring system combines the advantages of both approaches by spatially resolving and statistically comparing the actual wind conditions. 40 Wind Industry in Germany

Advertorial Fig. 1: Mean wind speed distribution across a 25ha area at 100m above ground at a complex location in the Eifel region Applications The measurement of wind speed and direction by means of the onboard anemometer is influenced by the flight system’s own movements and tilting as well as by propeller induced winds. These disturbance variables are compensated for by means of sensor fusion via an analysis module, which was developed in house, with additional position and acceleration sensors. The standard uncertainty of the WindLocator is therefore only 0.37 m/s and is therefore comparable to the specified accuracy of the anemometer itself (0.18 m/s). Local wind conditions can, therefore, be recorded in a reliable and robust manner, as was successfully demonstrated in validation tests with stationary anemometers on the measuring mast and near the ground. The system can be used profitably in almost all project phases during the windfarm planning process, starting with the preliminary evaluation of potential wind farm locations, through the analysis of the overall wind conditions in the planned wind farm to the targeted identification of high-yield turbine locations. In particular, the early definition of the specific turbine locations makes it possible to use expensive, directive-compliant measuring systems only where the wind conditions really require it, thus reducing the resulting uncertainty in the wind report. The flexibility of the measuring system also allows it to be used in various application scenarios, e.g. to validate simulation results or to investigate follow-up effects. Project overview Initiator Implemented by Facts and figures Project status Location In-house initiated development CWD Aachen GmbH in collaboration with IME Aachen GmbH and RWTH Aachen University Autonomous, position-controlled wind measuring system, up to 25m/s wind speed, standard uncertainty 0.37 m/s Development phase completed, sales launch completed The project is not site-specific. The system can be used throughout Germany. Conclusion Significant differences in the spatial wind speed distribution lead to large uncertainties in park planning involving complex terrains. The CWD WindLocator provides a faster and more cost-effective insight into the local wind conditions compared to established methods. The validated measuring system can therefore be used profitably in almost all project phases of the park planning process. Are you interested in the project and want to know how your community or your business can benefit from it? Contact us. Our contact can be found in the company profile on page 132 www.windpower-aachen.de Wind Industry in Germany 41

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