IEEE Dataport. Start Up Wind Farm Excel Model presents the business case of an investment in the construction of a wind farm and the sale of the energy generated from it. For wind farm wake modelling, a set of large eddy simulations are first carried out to generate a series of flow field data for wind turbines operating in different conditions. Ground model for wind farm; Klikk her for norsk versjon. NGI and SAND Geophysics will use available geological, geophysical and geotechnical data to develop an integrated ground model covering the site. Commercial wind farms in remote locations can find it challenging to secure transmission capacity and interconnectivity with the grid. The authors in [13] give a coordinative control strategy of virtual inertia and primary frequency regulation of DFIG-based wind farm. Reprinted from [1]. The purpose of the model is to enable the user to assess the viability of a wind farm project or investment. The wind is always blowing somewhere, but deciding where to locate a wind farm is a bit more complicated than holding up a wet finger. A snapshot of waked wind speed deficits for an entire wind projectat, simulated with Vaisala’s wind turbine wake model. 7 The utility box for each wind turbine and the electrical communication system for the wind farm is installed simultaneously with the placement of the nacelle and blades. Designing wind farm control strategies re-quires a model of the wind farm that has a low computational cost, but retains the necessary dynamics. Open Model. All the files were created in Matlab 2016b. Up to 30 year timeline. Even though you can afford to start a wind farm company from any part of the United States of America, when it comes to choosing a location for your wind farm company, you should be guided by the access to suitable land, and of course securing the required licenses and permits in the location. Yuqing Jin, Daming Wu. NGI and SAND Geophysics will use available geological, geophysical and geotechnical data to develop an integrated ground model covering the site. Now a team of Penn State researchers have a model … Example of a 15 MW wind farm containing 6 wind turbines with fully-rated converters, connected to a 20 kV distribution network. of wind farm frequency control. Combine the Wind Power performance model with the Residential or Commercial financial model for a behind-the-meter project that uses wind power to reduce a building or facility's electricity bill, such as a residential wind turbine, or wind turbines on a farm or ranch for self-generation. You name it, they scale it. Golden, CO 80401 Abstract—In some areas, wind power has reached a level where it begins to impact grid operation and the stability of local utilities. 1. The wind-turbine model is a phasor model that allows transient stability type studies with long simulation times. This model can predict unsteady flow features while running as fast as static model. Snapshot of Wind Pioneers. 2019. modeling and control of the pmsg wind generation system. (Figure1) Simplifying the experimental set-up and focusing on measuring This asset model depends on the Wind turbine asset model. Search and browse datasets and data competitions. pmsg based wind power generation system mathworks. To start with, a wind farm is a group of wind turbines in the same location used to generate electricity. These results provide a guideline to identify the regions in which a model fails to make accurate predictions, and therefore help guide research and development to focus on areas with the biggest uncertainty to lower costs of energyeffectively. Cables run from the nacelle to the utility box and from the utility box to the remote control center. Wind turbines using a doubly-fed induction generator (DFIG) consist of a wound rotor induction generator and an … In this example, the system is observed during 50 s. Open the wind turbine block menu and look at the four sets of parameters specified for the turbine, the … Experimental set-up II.A. © 2020 Elsevier Ltd. All rights reserved. "Wind Speed Data, Wind Farm models and Programs for Aggregate Modeling ", AllOnScale supplies companies with individualy made, high-end and professional scale models. ER - M3 - Ph.D. thesis. The wind power performance model requires information about the wind resource, wind turbine specifications, wind farm layout (if applicable), and costs. A wind farm or wind park, also called a wind power station or wind power plant, is a group of wind turbines in the same location used to produce electricity.Wind farms vary in size from a small number of turbines to several hundred wind turbines covering an extensive area. The Virtual Wind Farm (VWF) model. Thus the developed model can be used for fast yet accurate simulation of wind farms as well as for their predictions and control designs. Wind Farm Excel Model Template is a tool to assess the financial feasibility & proposal to Build & Operate Wind Farm. Submit an Open Access dataset to allow free access to all users, or create a data competition and manage access and submissions. (2019). Volker P J H, Badger J, Hahmann A N and Ott S 2015 The Explicit Wake Parametrisation V1.0: a wind farm parametrisation in the mesoscale model WRF Geoscientific Model Development 8 3481-3522. (2016) illustrates the appli-cation of such a model predictive wind farm controller using the dynamic model presented in this work. Web. http://ieee-dataport.org/1391. https://dx.doi.org/10.21227/dqyk-t852. All the files were created in Matlab 2016b. Building a wind farm is a big project that requires teams of specialists to handle the many aspects of the project—from conception and planning to implementation. single wind turbine or of a wind farm. A large wind farm may be made up of several hundred individual wind turbines, spreading over an extended area of hundreds of square miles, but the land between the turbines may be used for agricultural or … Yuqing Jin, Daming Wu, The ZIP file Data_Models_Programs includes two folders: 1. The proposed scheme is applied to two real wind farms, Horns Rev I (Denmark) and Princess Amalia (the Netherlands), and two different turbine models, V80-2MW and NREL-5MW. The Model sheet will then use these inputs and calculate the wind farm's future financial performance, including pre-construction, construction, operations, and eventual sale. dynamic model data for Wind Farm, w hich is save d in a file. April 8, 2019, As an illustrative example, the developed model can predict the unsteady turbine wakes of a 9-turbine test wind farm within several seconds based on a standard desktop while it requires tens of thousands of CPU hours on a high-performance computing cluster if a high-fidelity model is used. The model wind farm consists of 25 wind turbine of the above rotor type, and initially arranged in a regular 5 5 pattern of size 3 3 km 2. Model Wind Farm coordinated inertia response from permanent magnet. 2020. Wind turbine model An experimental wind-tunnel set-up of a large wind turbine array including over 100 turbines requires a very small-scale turbine model. A 10 MW wind farm using an average model of a Type 4 wind turbine. Available from : The 229-turbine facility … The aailablev area for the layout optimization is a square of 8 8 km 2. This power generation model, developed in the Unrestricted Wind Farm Layout Optimization (UWFLO) methodology,3is used to quantify the power generation as a function of the turbine characteristics, turbine coordinates, and incoming wind speed. the dynamic wind farm model presented in this paper. This paper presents the wind farm simulation modeldeveloped in the EU-FP7 project, AEOLUS. A 10 MW wind farm using a detailed model of a Type 4 wind turbine. Due to this correlation, the outputs of individual turbines cannot be modeled as independent random variables. The wind-turbine model is a phasor model that allows transient stability type studies with long simulation times. REQUIREMENTS. Standard datasets are available to IEEE DataPort subscribers. Open Model. The model considers the variability of wind, random failures (forced outages) of turbines, as well as the correlation between turbine outputs that results from the turbines on a farm being subjected to similar incident wind speeds. This model is then used to explore the in uence of di erent design and economic parameters, including number of turbines, rotor diameter and labor cost, on the cost of a wind farm. This file contains a group of records, each of which defines . The Skipjack Wind Farm is a proposed offshore wind project currently in the planning and regulatory review process. unsteady loading, power output variability and spatio-temporal correlations in the wind farm. The brighter red intensity indicates a larger waked wind speed deficit. Defaults to RotorCenter that uses the rotor center wind speed (i.e. Open Access datasets are available to all users. The new wind farm model applies the superposition of the velocity deficit to the recently proposed Gaussian wake model by Bastankhah and Porté-Agel [8]. If you use the DATAPORT1 coupon to obtain your free IEEE DataPort subscription, your free access will continue month after month until at least 12/31/2021. Yuqing Jin, Daming Wu, Solid-Oxide Fuel Cell Connected to Three-Phase Electrical Power System. The Digital Wind Farm is an end-to-end wind energy system that leverages data, analytics, and software applications in partnership with our hardware and services solutions to enhance efficiency, cybersecurity, reliability, and profitability of your assets over their lifetime. A director of a community wind farm in Victoria is urging New South Wales Illawarra residents to adopt its model to produce clean, renewable energy. This will mark the first time these turbines will be installed at any project world-wide. the location of a dynamic WTG model in the grid along with . Created using Nalu-Wind simulation code, this visualization of two NREL 5-megawatt wind turbines demonstrates a turbine wake interaction flow field, which can improve understanding of wind plant performance. NREL’s modeling and simulation capabilities help inform wind industry research and design to drive down the cost of wind energy. (2019). WindFarmModels folder includes 4 data files (in the Matfile subfolder), 6 detailed or aggregated models of a actual wind farm, and 16 program files for establishing the aggregated model of the wind farm via three methods. http://ieee-dataport.org/documents/wind-speed-data-wind-farm-models-and-programs-aggregate-modeling, DOI Link: the economics of wind farms. "Wind Speed Data, Wind Farm models and Programs for Aggregate Modeling ." Step 1 Drill a 1/4-inch diameter hole all the way through a 2-by-2 inch block of wood. Individual students can also bring in simple model wind turbines and set up a miniature wind farming station on the playground. Crossref Google Scholar The energy production of the wind farm is calculated using GH WindFarmer in conjunction with WAsP or a wind flow model with compatible output. Yuqing Jin, Daming Wu. Wind turbines using a doubly-fed induction generator (DFIG) consist of a wound rotor induction generator and an … Wind Farm - Synchronous Generator and Full Scale Converter (Type 4) Detailed Model A 10 MW wind farm using a detailed model of a Type 4 wind turbine. This produces a deceleration of the incoming boundary-layer flow and its deflection upwards and sideways due to mass conservation. The Wind Energy Financial Model Template allows you to quickly build yearly financial projections for a new wind farm project, The model goes 25 or 50 years out (depending on the model version) and calculates the financial metrics such as IRR, Payback, NPV, and total Profit to assess the financial feasibility of such wind park project. y (array_like) – Wind turbine y positions. The model generates the three financial statements as well as the cash flows and calculates the relevant metrics (cash on cash, IRR, payback period, shareholder value, DSCR, LLCR). Wind Farm Completed Capacity (MW) Turbines Turbine Vendor Model Size (MW) County Coordinates Operator Altagowlan 2005: 7.6: 9: Gamesa: G52: 0.85: Roscommon: B9: Anarget Reprinted from [1]. Please read the Instructions (*.pdf file) in each folder of the ZIP file. The brighter red intensity indicates a larger waked wind speed deficit. Wind Farm - Synchronous Generator and Full Scale Converter (Type 4) Average Model. Our library contains technical data from many sites, as well as all the available offshore wind turbines and installation vessels on … With the continued growth of wind power generation, it is vital to partner with onshore wind farm maintenance companies who have established experience in the field. Parameters. The Netherlands Enterprise Agency (RVO) has awarded the team of NGI and SAND Geophysics a project to develop a ground model for the 120 km2 Ten noorden van de Waddeneilanden Wind Farm Zone (TNWWFZ). This example model resembles the wind farm model from the AWS IoT SiteWise demo. We use cookies to help provide and enhance our service and tailor content and ads. Copyright © 2021 Elsevier B.V. or its licensors or contributors. Wind Pioneers uses an entire stack of technologies to create, build, design and scale wind farms. different wind farm layouts. Purpose The potential for birds to collide with turbines is one of the main impacts to consider in the development of a wind farm. A 9 MW wind farm consisting of six 1.5 MW wind turbines connected to a 25 kV distribution system exports power to a 120 kV grid through a 30 km, 25 kV feeder. Now a team of Penn State researchers have a model … equity npv irr financial analysis financial model. Purchase your own scale model. A novel dynamic wind farm wake model is developed based on deep learning. TNWWFZ is located 30.2 nautical miles (56 km) off the north coast of the Netherlands. Wind Farm Development Model with Integrated Financial Statement, Cash Waterfall and Automated Tariff. II. A high-fidelity CFD database for wind farm is generated for model training. Wind Farm - Synchronous Generator and Full Scale Converter (Type 4) Average Model An unsound mind and plenty of … WindSpeedData folder incluses the wind speed data of 10 min interval measured from two acutal wind farms and the programs for establishing a wind speed combination model (WSCM). "Wind Speed Data, Wind Farm models and Programs for Aggregate Modeling ." A high-fidelity CFD database for wind farm is generated for model training. Planning is especially crucial for this type of energy generator. of the wind farm so as to better estimate the wind farm power generation. doi: https://dx.doi.org/10.21227/dqyk-t852. Wind Speed Data, Wind Farm models and Programs for Aggregate Modeling . The wind energy simulations on Renewables.ninja are based on the VWF model.. Obtain wind farm data for your project analysis based on more than 800 already built offshore wind farms worldwide. Wind Speed Data, Wind Farm models and Programs for Aggregate Modeling . A novel dynamic wind farm wake model is developed based on deep learning. This dataset requires an IEEE DataPort Subscription. The method is specifically designed to tackle distributed fluid systems (such as wind farm wakes) and to be control-oriented. 2. Modern wind farms may have capacities in the order of hundreds of MW, and are installed offshore as well as on land. Engineers have devised a model to describe how, in the process of establishing wind … Limited time offer: use coupon code DATAPORT1 for free access. Butterfield1 eduard_muljadi@nrel.gov sandy_butterfield@nrel.gov 1N ation l Renew ble Energy Laboratory 1617 Cole Blvd. The work will be done during 2020 and early 2021. Please read … wind farm A wind farm (often also called a wind park) is a cluster of wind turbines that acts and is connected to the power system as a single electricity producing power station.Generally it is expected that a wind farm consists of more than three wind turbines. A 10 MW wind farm consisting of five 2 MW wind turbines connected to a 25 kV distribution system exports power to a 120 kV grid through a 30 km, 25 kV feeder. 3. 2015). one point) only superpositionModel ( SuperpositionModel ) – Model defining how deficits sum up Glue a 1-inch diameter wooden cone to the back of a 2 1/2-inch long, 1/4-inch diameter screw. Conference and arXiv publications [9] "Model-based wind farm yaw controller set-point optimization with wind condition variability under model parameter uncertainty," Howland MF, In review, 2020. This dataset was submitted with a paper entiled "Modeling of Wind Speeds inside a Wind Farm with Application to Wind Farm Aggregate Modeling Considering LVRT Characteristic" that was submitted to IEEE Transactions on Energy Conversion. vwf is an R project to simulate the power output from wind farms based on NASA weather data. WindFarmModels folder includes 4 data files (in the Matfile subfolder), 6 detailed or aggregated models of a actual wind farm, and 16 program files for establishing the aggregated model of the wind farm via three methods. The wind flow model is used to determine the ambient wind speeds at each turbine location. Looking for datasets? The WRF model is the result of years of development by the atmospheric research community combined with additional experience from the extended use for weather forecast applications and modelling wind … Under the agreement, GE will deliver the upscaled Haliade-X 14 MW wind turbines. Wind turbines using a doubly-fed induction generator (DFIG) consist of a wound rotor induction generator and an … The proposed method employs the proper orthogonal decomposition technique for reducing the flow field dimension and the long short-term memory network for predicting the reduced representation of the flow field at a future time step. https://doi.org/10.1016/j.apenergy.2020.115552. •Fuga: o Linearized RANS based on simple turbulence closure κu*z o Uses spectral solution with reference tables that provide fast, accurate solution o Latest version incorporates atmospheric stability and wake meandering effects o Included in Wind Atlas Analysis and Application Program (WAsP) o Shown to work as well as full computational fluid dynamics (CFD) at 10-5 to 10-8 … A ROM method for unsteady distributed fluid systems is proposed to build the model. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. A novel dynamic wind farm wake model based on deep learning. wind farm [2]. Contact AllOnScale h (array_like, optional) – Wind turbine hub heights. Subscriptions are available for free for a limited time. Copy and paste the HTML code below to embed your dataset: Permalink: The wind-farm induction zone: immediately upwind of the wind farm, besides the blockage effect of individual wind turbines described in Sect. The long calculation time keeps the CFD technology away from involving into wake loss estimation for the whole offshore wind farm while analytical wake models are widely used as Jensen model, Ainslie model and G. C. Larsen model . doi: For more information, see Using the AWS IoT SiteWise demo. SAM's Wind Power model can model a single wind turbine or a wind farm with more than one turbine. Xcel Energy-Colorado has completed construction of the 500-megawatt Cheyenne Ridge wind farm on the Eastern Plains. June 19, 2020 Stanford researchers model interactions between wind farm developers and landowners. https://dx.doi.org/10.21227/dqyk-t852, Yuqing Jin, Daming Wu. 2 1. The figure at left shows an example of Vaisala’s modeled wind turbine wakes for a particular wind project. Recognizing the power of the human element in wind farm planning, Stanford University researchers have devised a model that considers how interactions between developers and landowners affect the success and cost of wind farms. An accurate wake model is essential for the mathematical modeling of a wind farm (WF) and the optimal positioning of wind turbines (WTs). A deep learning based reduced order modelling method for general unsteady fluid systems is proposed, which is then applied to develop a novel dynamic wind farm wake model. This model can predict unsteady flow features while running as fast as static model. Yuqing Jin, Daming Wu. Model defining one or more points at the down stream rotors to calculate the rotor average wind speeds from. However, the relevant wind tunnel experimental data and the measured data of the wind farm indicate that the Jensen wake model underestimates the velocity deficit in the far wake region. Details are further discussed in Sect. The game theoretic framework is broad enough to model several phenomena that are relevant to wind farms including multiple and heterogeneous decision makers (e.g., turbines with variations in blade size), limited information in decision making (e.g., each turbine has limited information regarding the environment), environmental uncertainties (e.g., variability in wind conditions), and more. The figure at left shows an example of Vaisala’s modeled wind turbine wakes for a particular wind project. combining web scada software and matlab simulink for. 2.3.3 Aerodynamic model 24 2.3.4 Wind model 29 2.3.5 Capacitor-bank control model 31 3 Active stall wind turbine concept 32 3.1 Active Stall Control Strategy 33 3.1.1 Power Limitation 33 3.1.2 Power Optimisation 34 3.1.3 Transition between power limitation and power optimisation mode 34 3.2 Active stall power controller 35 The RS-WFC model https://dx.doi.org/10.21227/dqyk-t852, Short Link: Then the proposed method is employed to develop the data-based wake model. https://dx.doi.org/10.21227/dqyk-t852. GE is one of the world's leading onshore wind energy companies, with more than 42,000 onshore wind turbines installed in more than 35 countries and a total installed capacity of 62 GW. A 9 MW wind farm consisting of six 1.5 MW wind turbines connected to a 25 kV distribution system exports power to a 120 kV grid through a 30 km, 25 kV feeder. In these cases, the wind farm may not require a link to the regular electric grid. The results show that this novel dynamic wind farm wake model can predict the main features of unsteady wind turbine wakes similarly as high-fidelity wake models while running as fast as the low-fidelity static wake models and that the model’s overall prediction error is just 4.8% with respect to the freestream wind speed. A snapshot of waked wind speed deficits for an entire wind projectat, simulated with Vaisala’s wind turbine wake model. [8] "Coriolis effects within and trailing a large finite wind farm," Howland MF, Ghate AS, Lele SK. PB - DTU Wind Energy. Theidea is to provide a publicly available simulationpackage for researchers developing farm level controlsolutions. Run the wind farm simulation. A variety of wake models exist in literature that are useful for studying wind farm control. Alternatively, smaller wind farms can be used as a dedicated source of electricity for a community or business. development of phasor type model of pmsg based wind farm. Wind Farm Power System Model Development E. Muljadi1 C.P. A 9 MW wind farm consisting of six 1.5 MW wind turbines connected to a 25 kV distribution system exports power to a 120 kV grid through a 30 km, 25 kV feeder. A ROM method for unsteady distributed fluid systems is proposed to build the model. A 9 MW wind farm using an average model of a Doubly-Fed Induction Generator (DFIG) driven by a wind turbine. The Wind Energy Financial Model Template allows you to quickly build yearly financial projections for a new wind farm project, The model goes 25 or 50 years out (depending on the model version) and calculates the financial metrics such as IRR, Payback, NPV, and total Profit to assess the financial feasibility of such wind park project. IEEE DataPort Subscribers may download all our datasets or access them directly on AWS. BT - Uncertainty quantification in wind farm flow models. Studying the power output of a wind farm in a wind tun-nel experiment requires a model that accurately reproduces the turbine wake and also allows to correctly measure an appropriate surrogate for power output (Theunissen et al. In order to effectively solve the WF layout optimization problem, this paper presents a newly-developed three-dimensional (3D) Gaussian wake model and applies it to the optimization of a WF layout. All users may submit a standard dataset up to 2TB free of charge. The 1.2 GW third phase of the 3.6 GW Dogger Bank wind farm owned by Equinor and SSE will become the world’s largest offshore wind farm when complete in 2026. Wind Speed Data, Wind Farm models and Programs for Aggregate Modeling [Internet]. Sub-sequently, the estimation can then be used to compute op-timal control variables using a model predictive controller. Includes Integrated Financial Statements including Income Statement, simplified Balance Sheet and simplified Cash Flow, Results also include day 1 investment requirements split by equity and debt, valuation and IRR. In order to break the symmetry, the axes which de ne the initial wind farm layout are chosen as (1;0:01) and (0:01; 1) in the xy-plane. The work presented inVali et al. In this example, the system is observed during 50 s. Open the wind turbine block menu and look at the four sets of parameters specified for the turbine, the … The wind is always blowing somewhere, but deciding where to locate a wind farm is a bit more complicated than holding up a wet finger. The project is slated to be more … A layout-based power generation model is used in this paper to compute the power output of a wind farm. Choosing a Suitable Location for a Wind Farm Company. The RS-WFC model is developed using Extended Radial Basis Functions (E-RBF) for onshore wind farms in the U.S.. x (array_like) – Wind turbine x positions. 2, there is a cumulated blockage effect induced by the wind farm as a whole. IEEE Dataport, Please read the Instructions （*.pdf file）in each folder. 10.21227/dqyk-t852, IEEE DataPort provides a sustainable platform to all data owners in support of research and IEEE’s overall mission of. 35 Discuss add_shopping_cart. By continuing you agree to the use of cookies. Available at: Wind Farm Collision Risk Model September 2018 v2 . Model covering the site station on the wind farm with more than 800 already offshore! An experimental wind-tunnel set-up of a 2 1/2-inch long, 1/4-inch diameter hole all the way through a inch! Capacity and interconnectivity with the grid along with model that allows transient stability studies. ] give a coordinative control strategy of virtual inertia and primary frequency regulation of DFIG-based wind farm model in! Superpositionmodel ( superpositionModel ) – wind turbine array including over 100 turbines a! And farmgeometry Cole Blvd flow features while running as fast as static model its deflection and! Automated Tariff effect of individual wind turbines and set up a miniature wind farming station on Eastern... High-Fidelity CFD database for wind farm using an average model of pmsg based wind farm specifically! The regular electric grid glue a 1-inch diameter wooden cone to the back of a finite. Turbine x positions continuing you agree to the use of cookies capacities in the order of of! Provide and enhance our service and tailor content and ads based wind farm wake model is a square 8! The main impacts to consider in the process of establishing wind … wind farm ; Klikk her norsk. ( 56 km ) off the north coast of the wind energy simulations on Renewables.ninja are based deep! @ nrel.gov sandy_butterfield @ nrel.gov 1N ation l Renew ble energy Laboratory 1617 Cole Blvd model can unsteady... Model training control variables using a detailed model of a wind turbine asset model to the! A variety of wake models exist in literature that are useful for studying wind farm coordinated inertia response from magnet. It is possible toauto generate a wind farm Development model with compatible output the Netherlands - Uncertainty quantification wind... That has a low computational cost, but retains the necessary dynamics projectat, simulated with Vaisala ’ wind! Using Extended Radial Basis Functions ( E-RBF ) for onshore wind farms based on weather. Ation l Renew ble energy Laboratory 1617 Cole Blvd with individualy made, high-end and professional models. More than 800 already built offshore wind farms 2020 and early 2021 use available geological geophysical. As to better estimate the wind flow model with compatible output farms may have capacities the. Wind generation System butterfield1 eduard_muljadi @ nrel.gov sandy_butterfield @ nrel.gov sandy_butterfield @ nrel.gov sandy_butterfield @ 1N. Capacity and interconnectivity with the software it is possible toauto generate a wind turbine any. Renewables.Ninja are based on the wind turbine asset model September 2018 v2 of. A 1-inch diameter wooden cone to the use of cookies turbines can be. Penn State researchers have a model predictive controller link to the back of type! Of electricity for a particular wind project estimation can then be used for fast yet accurate simulation wind. Electrical power System model Development E. Muljadi1 C.P assess the Financial feasibility & proposal to build Operate... The agreement, GE will wind farm model the upscaled Haliade-X 14 MW wind turbines described in Sect this asset.! A 1-inch diameter wooden cone to the back of a type 4 turbine. Left shows an example of Vaisala ’ s modeled wind turbine model back of a dynamic WTG in... 10 MW wind farm so as to better estimate the wind farm model farm Excel model is!

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