Design Challenges Towards. Hamburg, Germany
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1 Design Challenges Towards Automated Flight Control for Tethered Kites Michael Erhard SkySails GmbH Hamburg, Germany Airborne Wind Energy Conference Berlin, September 11, 2013
2 SkySails Marine Towing Kite System Airborne Control Pod
3 SkySails Power Pumping Cycle Functional Model (Installed Generator Power 55kW)
4 Contents Introduction Model for Tethered Kite Dynamics Flight Controller Design Challenges Conclusions
5 Introduction Economic energy generation Fully automated AWE plants Reliability of control system crucial
6 Introduction Wind is challenging: Perturbations due to Wind Gusts Tethered System in Crosswind Flight Wind Air Speed +30% +30% t t Tether Force +69% t
7 Introduction Wind is challenging: Profile????? How to model the wind field? Profile? Boundary layer?...
8 Introduction Soft Materials Free Flight Modelling Accuracy is limited Limited Sensor `Accuracy Accuracy Tether Slack Line Angle Sensors
9 Introduction Challenges to be tackled by Model determines Controller Design input data Estimation `Keys Keys to Success Keep it simple! Explicit Understanding of Dynamics Transparent and Deterministic Design
10 MODEL
11 Simple Model Position, Orientation Model Assumptions 1.) Neglect Accelerations & Masses 3.) Glide Ratio Condition 2.) Airflow in Roll Direction
12 Model of Tethered Kites Periodic Signal on yields Pattern: +ψ 0 --ψ 0 Equations of Motion: Control Force: Control Position (static ϕ=const) Angle is the Central Control Variable
13 Validation of Kinematics M. Erhard, H. Strauch, Theory and Experimental Validation of a Simple Comprehensible Model of Tethered Kite Dynamics Used for Controller Design, in: Airborne Wind Energy, Springer, DOI / _8 (2013)
14 Experimental Results Flight Direction M. Erhard, H. Strauch, Theory and Experimental Validation of a Simple Comprehensible Model of Tethered Kite Dynamics Used for Controller Design, in: Airborne Wind Energy, Springer, DOI / _8 (2013)
15 Steering Steering by means of canopy (and force vector) rotation Aerodynamic force vector Side Force Passive section F 1 F 2 Actively steered section Control pod Towing rope Turn Rate Law
16 System Identification Test Turn Rate Law? Bang-Bang-Experiment +δ 0 --δ 0
17 Extended Turn Rate Law 2 Fit Parameter Gravitation
18 Turn Rate Law M. Erhard, H. Strauch, Control of Towing Kites for Seagoing Vessels, IEEE Trans. Control Syst. Technol., DOI /TCST (2012) Theoretical derivation and experiment arxiv: , submitted to IEEE Trans. Control Syst. Technol. (2013)
19 FLIGHT CONTROL
20 Flight control Human Control Strategy? Use Angle w.r.t horizon (or wind) Orientation determines flight direction Controlled System (Plant) Turn Rate Law Kinematic Steering Input Orientation Flight Direction
21 Flight Control Cascaded Structure. M. Erhard, H. Strauch, Theory and Experimental Validation of a Simple Comprehensible Model of Tethered Kite Dynamics Used for Controller Design, in: Airborne Wind Energy, Springer, DOI / _8 (2013)
22 Model Based Feedforward M. Erhard, H. Strauch, Control of Towing Kites for Seagoing Vessels, IEEE Trans. Control Syst. Technol., DOI /TCST
23 Linearization of plant Turn Rate Law M. Erhard, H. Strauch, Control of Towing Kites for Seagoing Vessels, IEEE Trans. Control Syst. Technol., DOI /TCST
24 Controller Performance Outer Loop M. Erhard, H. Strauch, Control of Towing Kites for Seagoing Vessels, IEEE Trans. Control Syst. Technol., DOI /TCST
25 Controller Performance Inner Loop M. Erhard, H. Strauch, Control of Towing Kites for Seagoing Vessels, IEEE Trans. Control Syst. Technol., DOI /TCST
26 CHALLENGES
27 Sensor Overview
28 Inertial Navigation Measured effects small compared to dynamics e.g. Reference to `down -direction Average accelerations M. Erhard, H. Strauch, Sensors and Navigation Algorithms for Flight Control of Tethered Kites, Proc. European Control Conf., arxiv: (2013)
29 Free flight Due to Gusts or wave induced motion: temporarily untethered system Angle w.r.t. Horizon `undefined Line Angle Sensor
30 Solution: Consider Symmetry Wind Wind Singularity Singularity Symmetry w.r.t. Gravity Symmetry w.r.t. Wind
31 Trajectory Generation Do not try to follow an exact trajectory `let the pattern evolve Force Control Step-Controller on Amplitude Controller quite efficient w.r.t. wind uncertainties, but room for improvement...
32 Trajectory Generation Unknown Wind distribution Use local Measurement for Control (Turn Rate Law) Try to estimate Wind Speed and Direction at Flight Altitude Guidance by using Target Points L. Fagiano, A.U. Zgraggen, M. Morari, M. Khammash, Automatic crosswind flight of tethered wings for airborne wind energy: modeling, control design and experimental results, arxiv: (2013) Future Work Extended Wind Models (profile,...), in particular for force control and optimization of Power Take into Account `short time Effects (Gusts) NMPC???...
33 Conclusions Control of Airborne Wind Energy Systems Challenging! Status Standard Flight Situations `Special Situations Work to be done to increase reliability Design Concepts Model Simple Model Describes Dynamics Controller Architecture reflects Plant Structure Estimation Must be Robust against Exceptional Situations
34 Acknowledgements Hans Strauch Consultant since 2004 Thank you for your attention! Questions?
This is the author s final accepted version.
Wood, T. A., Ahbe, E., Hesse, H. and Smith, R. S. (2017) Predictive Guidance Control for Autonomous Kites with Input Delay. In: IFAC 2017 World Congress, Toulouse, France, 9-14 July 2017, (doi:10.1016/j.ifacol.2017.08.1965)
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