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Home » News and Events » Wind Lidar #307 – 10 years on

Wind Lidar #307 – 10 years on

30 Oct 2019

2010, ZephIR HQ, Worcestershire, U.K.

The ZephIR 300 Lidar – a remote sensing wind measurement tool capable of collecting wind data remotely from its installed location by use of a infra-red laser – was born, following an 18 month product development program that focused on improving the ‘usability’ of remote sensing devices. The resultant product was described as being “easy to use, while also rugged to ensure its longevity in the field.”

In this paper we shall evidence that description and it begins with a number – #307. Mention that number to the team at ZX Lidars (ZephIR Lidar rebranded to ZX Lidars in 2018) and it will be met with a smile. And that’s because #307 has touched so many of the team and its use within the industry is the epitome of what a remote sensor should be, and do.

The first of its kind

As ‘300‘ was released to the market, it marked a step change in wind Lidar – of single ‘pod’ construction it was capable of operating from -40°C through to +50°C. It was small in size, low power, and fully CE compliant including approved ‘true’ Class 1 eye-safe laser classification. The system was provided with an 18-month service and warranty period as standard (today it’s up to 5 years) and that meant its calibration was valid for this period also. Performance was traced back to the IEC-compliant UK Remote Sensing Test Site, itself certified by Garrad Hassan (now DNV GL).

Finally – a remote sensor that could be used everywhere.

‘Field’ ready, #307 heads offshore

Following thorough testing of the first batch of 300’s, #307 was ready for its first deployment mid-2011 and instantly stepped in to an application where the cost drivers for remote sensing vs. traditional met mast anemometry was key – offshore wind resource assessment.

Deployed for the Forewind consortium, #307 headed for the Cavendish platform in the North Sea in support of a potential offshore wind farm development in the designated area of Dogger Bank.

Today the prevailing industry view is that there will not be another met mast installed offshore (and even fixed platform mounting of remote wind sensors for pre-construction wind resource assessment is in decline) in favour of Floating Continuous Wave Lidar; however, eight years ago this was very much an industry innovation.

#307 was installed by the platform’s operator RWE Dea UK, measuring wind speed and direction from just 10 metres above the platform (it’s important to measure this low when the platform is already some distance out of the water) and up to heights of 200m.

The dataset collected was the first high-quality wind data measurement in close proximity to the Dogger Bank Zone. At the time, Forewind confirmed that #307 was to be used in early site design activities and to “improve the evaluation of the overall project wind resource by enhancing the validation of local wind modelling”.

https://www.offshorewind.biz/2011/07/14/forewind-deploys-zephir-300-to-collect-wind-data-on-dogger-bank-uk/

Wind Lidar installed at Dogger Bank

Anywhere the wind blows

Following its 2-year campaign offshore, #307 returned for a brush down before quickly being redeployed in 2013 for a confidential meteorological project where highly accurate met data was required for weather monitoring within the UK.

In contrast to the long periods of uninterrupted operation offshore, these met campaigns were lasting for just a week at a time and so #307 was chosen due to its compact nature and ability to be transported easily and installed rapidly in a range of operational situations. The operator deployed the Lidar for these short periods of time in a range of locations demonstrating the flexibility of this new tool.

At the time, the 300 series of Lidar was described as an ‘every day Lidar’ – the system just simply worked, straight out of the box or off the back of a pick-up truck, every day.

Having completed the series of short campaigns towards the end of 2013, the unit then moved on to something more traditional – an onshore wind resource campaign – for the Element Power Group, (now Statkraft).

Within this application, #307 and all of the wind Lidar 300 series had received Remote Sensing Stage 3 acceptance by DNV GL allowing the Lidar to be used in the formal process of an Energy Yield Assessment as the sole measurement device – and importantly, bankable within the finance community.

#307 could now begin working for developers offering an alternative to the incumbent met masts that were now falling short of planned new wind turbine hub heights. Wind Lidar offered users an accepted, validated methodology for collecting wind data across the full rotor diameter, removing that uncertainty gap being witnessed for height-limited met masts.

Today, Statkraft utilise ZX Lidars as Permanent Met Lidars on operational wind farms where the sensors are SCADA-integrated with the turbine OEM and assist with operational wind farm monitoring including power performance tests through to the provision of wind measurements for production forecasting / reporting.

From development to operation

In 2014, the leading offshore wind developer had already been operating offshore assets for some time and was pioneering the use of floating Lidars. Considering this and the use of Lidar as an operational wind farm tool #307 ventured offshore once more being deployed on an existing substation within an offshore wind farm along with two other wind Lidars. Out of the three, just two Lidar types were taken forward from this trial as suitable for the clients measurements and ZX Lidars was one of them

Matt Smith (ZX Lidars) said: “The developer had already said they weren’t going to use met masts offshore anymore – they were an early adopter of floating Lidar and they wanted to explore the core performance of the Lidars being used offshore so arranged for this inter-comparison test.  This positive assessment has certainly increased their usage of ZX Lidars in the following years.”

Lidar installed on offshore substation

Wind Lidar installed on offshore substation

All weather performance

To celebrate her approaching 5th birthday #307 travelled to Dhahran in the Kingdom of Saudi Arabia. KFUPM (King Fahd University of Petroleum and Minerals) working with KACST (King Abdulaziz City for Science and Technology) rented the Lidar for a relatively short wind measurement campaign, this also laid the foundations for KFUPM acquiring their own ZX Lidars.

Where previous deployments to date had demonstrated accuracy and mobility, #307 was now witnessing relatively extreme temperatures of 50°C and sand / dust-laden winds.

Dr. Mohamed Mohandes of KFUPM said “We had to think creatively about the high ambient temperatures we experience in the Kingdom but we worked together with ZX Lidars to get the required data set.” Several key scientific publications resulted from the measurements collected by the Lidar and from the work Dr. Mohandes and Dr Shafiqur Rehman undertook with #307.

An important lesson learned about high temperature environments – #307 had such a good time in Saudi it was like she didn’t want to leave – we learned a little bit more about customs.

A stable, long-term reference

Following export delays, #307 returned to the UK to undertake an important long-term reference project at the UK Remote Sensing Test Site in 2016.

Continuous Wave Lidars do not need to be calibrated to any in-field instrumentation – they are factory calibrated and time has proven that the calibration remains constant. If it didn’t then the cause – a change in the speed of light – would likely worry humanity more than the Lidar…

Lidar data validated against met masts over a 7 year period as shown below evidences the high long-term consistency of performance and supports the Factory Acceptance criteria now conducted on all new Continuous Wave Lidars that negates the need for any in-field validations prior to or post-use.

Lidars on test at UK Remote Sensing Test Site

Lidars on test at UK Remote Sensing Test Site

2011 Validation of Unit 307 vs. Met Mast at 91.5m

2018 Validation of Unit 307 vs. Met Mast at 91.5m

Pioneering new applications within the wind sector

In May 2017 following its standard checks and servicing, #307 returned offshore but now in support of a new application. Deployed on the Fred. Olsen Windcarrier jack-up vessel, the Brave Tern, the wind Lidar was to be used to monitor wind speeds and direction during crane lift operations.

Traditionally a series of manoeuvres are required to ensure safe lifting practices can be undertaken, orientating the crane boom through a range of direction sectors and at multiple heights to confirm wind speeds do not exceed agreed levels. These essential manoeuvres require valuable time offshore.

#307 provided the Brave Tern crew with the opportunity to assess wind speeds and direction above the vessel’s deck height and across all heights that the crane may be operating at. During its deployment, Fred. Olsen Windcarrier successfully installed 70 Adwen wind turbines at the 350MW Wilkinger Wind Farm.

Based on this landmark project the majority of new vessel contracts for offshore wind farm construction include the use of a Continuous Wave Wind Lidar to increase the safety and efficiency of these crane operations.

Lidar installed on Fred. Olsen Windcarrier's Brave Tern

Lidar 300 installed on Fred. Olsen Windcarrier’s Brave Tern

Out to pasture? Absolutely not!

Now past her 7th birthday, #307 returns to dry land and in 2018 takes up the now routine chore for wind Lidar onshore in green field wind energy development providing standalone, bankable wind resource assessments on a proposed multi-turbine wind farm site. Lidar is back demonstrating those core strengths again of accurate, rugged and reliable remote sensing of wind characteristics. Almost hidden in the landscape her low profile, low visual impact design allows for sympathetic development activities to be undertaken. Wind data that still surpasses new turbine hub heights is wirelessly and automatically delivered for analysis arriving in her current operator’s inbox.

As this paper is written towards the end of 2019, wind Lidar #307 still remains fully operational and approaching her 10th year of active service. She has successfully operated onshore, offshore on fixed platforms and vessels, in all weather conditions and for wind and meteorological applications once novel and now mainstream. As an investment she has returned it many times over with no more than her Standard Servicing, some spare parts and a dusting off between deployments. She functions with the current firmware for her type leaving the ZX Factory – a production promise we make to our customers.

Above all #307 represents the evolving industry she works within – in many ways she is indeed responsible for that evolution.

 

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