In April 2023, the National R & D Corporation New Energy and Industrial Technology Development Organization (NEDO) has been in Japan for the first time in Japan.Global style observation guidebookWas released.
This guidebook specifically summarizes the information on the wind -ups and windmills that are essential for offshore wind power plants and windmill design. In order for you to make effective use of it, Relatec explains the points from the viewpoint of the wind conditioner consultant.
The members of the Relatech, which are summarized with the latest knowledge both in Japan and overseas, are involved in the NEDO business mentioned above, and cooperated with the creation of guidebooks.
To be able to know the newly unified offshore wind observation method
With the aim of achieving the carbon native declaration in 2050, the plan for offshore wind power is being planned at a rapid pace in Japan.
When planning a wind power generation business, it is necessary to conduct an accurate windshield survey, but it has been pointed out that there is no unified offshore wind observation method in Japan so far. 。
For wind -powered winds, the method of directly observing the wind situation is based on an observation tower called the windbun mast.
Fig. 1 Observation image by windbun mast
Fig. 2 Case of German -style masts (from the left, German Fino, Choshi, Kitakyushu, Mutsu Ogawahara)
(Source: From FINO homepage, from NEDO homepage)
If such a windbun mast is used to observe the air on the sea, the construction will be highly costly. In addition, it is difficult to adjust the local adjustment and the permit and acceptance procedure when installing it.
What is expected to solve these issues is the observation method utilizing remote sensing technology. Use a device that uses a laser called a doppler rider.
About Doppler RiderPrevious articleAs I talked about in more detail, for example, there are various types of riders as shown in Fig. 3.
Figure 3 Image of wind status observation method
Doppler riders (SL, FLS), which have been developed for offs, are still new, and in order to introduce them in Japan, it is necessary to conduct accuracy verification in the natural environment in Japan and develop uniform observation methods using these. did.
Therefore, in 2019, in the NEDO's "Implanted Weather Wind Farm Development Support Project (Establishment of Global Wataru Survey Method)", accuracy verification using multiple models will be conducted, and the characteristics and issues of the observation method will be grasped. I can now. These results have been consolidated in the "offshore style observation guidebook".
5 Points of guidebooks to note ①②③
Introducing points in this guidebook from the perspective of Relatech, which is conducting a style consulting.
① As an observation device that can be used in the offshore style, the rider is cleared
The basics of wind situation observation are the method of the windbun mast. One of the reasons is that the turbulence (wind disturbance) that affects the windmill design is based on a cup -like speed meter installed in the windbun mast.
In the accuracy verification project described above, the following items are specified as the "available observation device" because sufficient accuracy of the breeze mast has been obtained (see Table 1).
"DSL" is recommended for rider measurement of turbulence strength, and "DSL / SSL / FLS / VL" is recommended for rider measurement such as wind speed and wind direction.
Table 1 Evaluation items under wind conditions necessary for the amount of power generation and windmill design (modified guidebook table 2.1)
| Evaluation item | Available observation equipment * 1 |
| Average wind speed | MM / DSL / SSL / FLS / VL |
| Wind speed appear frequency distribution | MM / DSL / SSL / FLS / VL |
| Frequency distribution by wind direction | MM / DSL / SSL / FLS / VL |
| Index for Windsia | MM / DSL / SSL / FLS / VL |
| Turbulence strength | MM / DSL |
* 1: A device that is technically available at present.
* 2: The abbreviation is as follows.
MM (Wind Mast), DSL (Dual Scanning Rider), SSL (Single Scanning Rider), FLS (Floating Rider System), VL (vertical rider)
According to Table 1, if you use a rider to include a turbulent strength, you will have to select DSL. However, DSL cannot be used in the offshore area where the laser does not arrive, and it is expected that FLS is used, but this guidebook does not recommend the turbulence strength measurement by FLS.
As described in * 1 in the table, what is compiled in this guidebook is a current result, and further verification is required in the future to make the turbulent strength measurement by FLS practical.
Nevertheless, the fact that the rider was specified as the offshore -style observation method, and that DSL was recommended in the guidebook for observation of turbulence intensity is a major step.
(2) Indicates the installation standards and setting methods for scanning riders (SL)
As shown in Fig. 4, it is assumed that DSL is selected in the observation method including the turbulence strength, and it is a main observation method in the coastal area where lasers arrive from land.
Until now, there were no clear standards for installing SL, and the observer was installing in trial and error. However, this guidebook was the first standard for the first time.
For example, regarding the "dual scanning rider (DSL)" method of measuring by placing two SL, the angle of "two lasers" is desirable between 30 ° and 150 ° on page 16 of the guidebook. Is ideally stated.
Until now, it has been considered by the rule of thumb, and for example, the operation at about 30 ° has been seen, but it has become easier to install because the scope of the incelusion that can be used as a reference is shown.
Figure 4 Case (left) and observation overview (right) of SL installation standards (left)
In addition, the attached document A describes the "hard target adjustment" required at the start of the observation, and it is also important that the setting method to be aware of when observing is specifically listed.
However, there are some places that cannot be said to be appropriate for all the conditions written in the guidebook, and may require a judgment after consulting an expert.
For example, it is desirable to be within 5 ° of the observation angle of DSL on page 18, but if DSL is deployed on land, it is often difficult to fit the upper end of the offshore windmill within 5 °. Furthermore, considering that windmills will become larger in the future, it is not very realistic.
On the other hand, it has been confirmed that the larger the elevation angle, the lower the observation accuracy, which is the reason why this "5 °" is described. In the future, I think it is necessary to consider better standards from both aspects of accuracy and operation.
③ Clarify the installation procedure of the floating rider system (FLS)
It is also a major point that the FLS safety and licensing acceptance procedure, which have relatively low installation in Japan, are shown. (Pp.30-31, accessory D)
By referring to the experience conducted in Japan, there are some notes to ensure the flow and safety of installation work, examples of licensing procedures (Table 2), etc. are summarized.
For example, if a buoy drifts at the sea, FLS observations require further safety, as it may cause damage to the surrounding facilities (such as ships, fishing nets, etc.). Therefore, when the FLS is introduced in Japan, it is considered a part that should always be read.
Table 2 Examples of licensing procedures for installation of FLS (excerpted guidebook table 7.1)
| Partner | item |
| Coast Security Department (Station) |
・ Application for permission to install the route sign |
| prefectures | Sea area occupation permission application |
| Harbor manager | Use of port facilities such as quay and yards |
FLS also adds the impact of sway due to the wind in addition to the random rider's (VL) of the trend strength. As a result, the measurement error is larger than the cup -shaped wind metropolis of the windbun mast.
In the future, the quantitative grasp of this measurement error and the research on the correction technology will be important in the future for FLS observations in the real sea area, including measurement of turbulent strength.
In this regard, Relatek is already working at Kobe University, where the headquarters is located. I would like to continue my research with ambitiously while working with Kobe University.
Figure 5Research examples related to FLS's upset compensation (left) and observation overview (right) (right)Left figure: Asakura and other, 2022)
In the first part, the point of the guidebook ① to ③ was explained.
Second partLet's talk about "Points ④: Specify the pre -accuracy verification method", "Point ⑤: How to complement effective data rates and data deficiency periods", and what you want to be aware of when using this guidebook.
References
- NEDO, offshore style observation guidebook, 2023, https://www.nedo.go.jp/library/fuukyou_kansoku_guidebook.html
- FINO1, https://www.fino1.de/en/
- NEDO, https://www.nedo.go.jp/fuusha/
- Teruyuki Asakura, Teruo Osawa, Yuji Aso, Land upright for floating rider performance evaluation (Part 2), 44th Wind Energy Symposium Preliminary Draft, 2022.
As a wind -up consultant, Relatech will conduct an optimal air -based survey using "observation" and "estimation" for wind power. Please feel free to contact us if you have any consultation on the style.
