Wind_Energy_Essentials_Lecture 8

Wind_Energy_Essentials_Lecture 8 - Wind Turbine Modeling...

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11/9/2010 1 Wind Turbine Modeling and Control EE5940: October 28, 2010 Peter Seiler, Ahmet Arda Ozdemir, Gary J. Balas, Mihailo R. Jovanovic Outline Introduction to Feedback Control Wind Turbines Modeling Control Fault Detection Future Research Directions
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11/9/2010 2 What is control? The idea of feedback Open vs. closed loop systems Block diagrams – a useful abstraction Current status The Idea of Feedback Feedback Compare the actual result with the desired result Take actions based on difference Feedback - also called closed loop control Feedforward or open loop control Make a plan and execute it
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11/9/2010 3 Open vs. Closed Loop Control Simplistic analysis based on static models Process model: Open loop control: Closed loop control: Also important to consider dynamics Properties of Feedback Reduces effects of process disturbances Makes system insensitive to process variations Stabilizes an unstable system Creates well defined relations between signals Warning! Risk for instability
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11/9/2010 4 Feedback: Examples Operational amplifier Maneuverable aircraft Cruise control Negative Feedback Amplifier Harold Black, 1927 Novel technique for correcting instability and distortion in amplification of communication signals: negative feedback Typically: gain determined only by passive components!
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11/9/2010 5 Maneuverable Aircraft Design unstable aircraft for increased maneuverability Use control to stabilize the aircraft during flight Automotive Cruise Control Objective: Use the engine throttle to track a desired speed specified by the driver. User interface Vehicle
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11/9/2010 6 Block Diagrams Capture the essence Hide the rest Abstraction Also some limitations Block diagrams: similarity between different types of control systems Open Loop Open Loop: Compute an engine throttle angle based on the desired velocity. Issue: Incomplete knowledge of the car dynamics Uncertain mass, e.g. different #’s of passengers Varying environment conditions, e.g. hills and wind Imprecise models for complex effects, e.g. engine dynamics and tire forces. Car Controller Slope of Road / Uncertain Mass Velocity Throttle Command Desired Velocity
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11/9/2010 7 Closed Loop Closed Loop: Update the throttle command based on a measurement of the current vehicle speed. Feedback is the basic principle used to control the system despite our incomplete knowledge. The use of feedback involves tradeoffs Stability, robustness, noise rejection Car Controller Velocity Throttle Command Desired Velocity Error Feedback Path Slope of Road / Uncertain Mass Cruise Control Block Diagram Car Controller Measured Velocity Throttle Cmd.
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Wind_Energy_Essentials_Lecture 8 - Wind Turbine Modeling...

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