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This book focuses on recent and innovative methods on vibration analysis, system identification, and diverse control design methods for both wind energy conversion systems and vibrating systems. Advances on both theoretical and experimental studies about analysis and control of oscillating systems in several engineering disciplines are discussed. V...
Contexts in source publication
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... this chapter, several improvements to the traditional passive vibration absorber are intro- duced that have been made over the last decades, ranging from semi-active or adaptive to active dynamic systems ( Figure 2). ...
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... equivalently, the active control force provided for the active suspen- sion system should be confined to a certain range. Due to actuator saturation, it is in addition assumed that the normalized active force is bounded as |u(t)| ≤ 1, Figure 2. Therefore, the bound on the control input is u max = 1, and the active force is bounded by u s . ...
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... the right-hand term, representing changes of the average kinetic energy in time, is also zero, then the power of drag forces should be, in turn, proportional to the kinetic energy with a negative sign. The diagram of the average kinetic energy as the function of control parameter K is shown in Figure 2. As we can see, the power of drag forces reduces after the bifurcation under the same external harmonic excitation. ...
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... the physical to dimensionless variables. The numerical parameters of the system are chosen by us as Figure 2. Bifurcation diagram-Average kinetic energy versus control parameter K. Solid lines refer to stable oscillations while dotted line marks unstable regime of oscillations. ...
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... uncertainties of the generator parameters. In this sense, we go through three steps, as shown in Figure 2. In each step, we calculate the associated error and we ensure the stability of the system by choosing the good function of Lyapunov in order to find the commands. ...
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... this sense, we go through three steps, as shown in Figure 2. In each step, we calculate the associated error and we ensure the stability of the system by choosing the good function of Lyapunov in order to find the commands. Figure 2. Rotor-side converter control system. ...
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... of different configuration types, generators, power converters and gear options have resulted in several commercial turbines and proprietary technology [3,4]. In Figure 2, the possible configurations for a WECS solution are presented. ...
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... a fixed-speed WECS, the turbine speed is determined by the grid frequency, the generator pole pair number, the machine slip and the gearbox ratio. A change in the wind speed will not affect Figure 2. WECS configurations. ...
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... active power delivered by the inverter is used to control the DC- link capacitor voltage, while the reactive power is set on each three-phase output group to obtain unity power factor operation, just as a common back-to-back VSC. The control implementation for one channel is shown in Figure 20. Figure 19. ...
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... converter modulation strategy implementation. Figure 20. Nine-switch converter grid side control scheme. ...
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... Figure 22, a derivation of the previously topology is presented, but in a multiphase, multichannel configuration, so each nine-switch converter is providing dual power flow. This fact forces the converter to operate in VFM modulation mode, thus reducing the DC-link modulation index. ...
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Citations
In the field of measurement technology, the use of unmanned aerial vehicles is becoming more and more popular. For many measurement tasks, the use of such devices offers many advantages in terms of cost and measurement effort. However, the occurring vibrations and disturbances are a signiϐicant disadvantage for the application of these devices for several measurement tasks. Within the scope of this work, a platform for measurement devices is developed. The platform is designed speciϐically for use on drones. The task of the platform is to isolate measurement equipments mounted on it from the drone disturbances. For this purpose we go through the product development process according to VDI 2221 to design a mechanical model of the platform. Then, control strategies are applied to isolate the platform. Since the disturbances acting on a drone are not always stationary, two control strategies known for their ability to handle uncertain systems are used. One of them comes from the ϐield of acoustic.
