Abstract
The paper presents a local stability analysis for machine speed control of wind turbine systems (WTS) in regime II.5, where the control objective is set-point reference tracking of the machine speed via a PI-controller. Stability criteria for the controller parameters are derived. Based on these criteria, the controller parameters are chosen by pole placement. Moreover, a model-based tuning rule is proposed which leads (i) to a stable and (ii) to an accurate and fast control performance. The control system is additionally augmented by anti-windup (AWU) and saturation (SAT) strategies to enhance its performance. Simulation results illustrate stability and tracking performance of the closed-loop system.
Highlights
The increasing amount of wind power for electrical power generation (12.4 % in Germany 2016 [1], p. 7) necessitates a detailed understanding of wind turbine systems (WTS) to be capable of fulfilling the increasing requirements [2] for wind turbine operators.This paper discusses machine speed control of WTS in regime II.5
Scenario 4: Control performance for an arbitrarily time-varying speed reference for three different controller tunings to illustrate the effect of tuning on stability and reference tracking control performance at different operation points
The control performance of all four scenarios is evaluated by the integral absolute error (IAE) performance measure
Summary
The increasing amount of wind power for electrical power generation (12.4 % in Germany 2016 [1], p. 7) necessitates a detailed understanding of wind turbine systems (WTS) to be capable of fulfilling the increasing requirements [2] (e.g., more strict grid codes) for wind turbine operators. In regime II., neither the nonlinear controller of regime II (see e.g., [6,7]) nor the pitch controller of regime III (see e.g., [2], Chapter 25) can achieve the goals of machine speed control in regime II.: (a) tracking of the max ) and (b) maximized power generation of the WTS. A simple method to achieve (a) is “to implement a torque-speed ramp” [13], which is explained in detail in [13,14] This method has several drawbacks; e.g., the WTS does not operate at its maximally achievable power generation and the “torque demand will be varying rapidly up and down the slope”
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