Current Issue : July - September Volume : 2017 Issue Number : 3 Articles : 5 Articles
Presented in this study is an investigation of the real-time performance of\na laboratory-scale model of wind turbine emulator. Developed to provide a costeffective\nexperimental facility for demonstrating and validating wind energy conversion\nsystems at new wind territories, the emulator comprises a software component\nwith a hardware interface of a motor-driven wound rotor induction generator. A\nreal-life wind speed profile is implemented on the model to investigate its performance\nunder a near-real-world scenario and, some operational characteristics of\nreal wind energy conversion systems are exactly replicated by the emulator in the\ncourse of the experimentation. The emulator could therefore be considered suitable\nfor use as a laboratory level testbed for the demonstration and validation of wind\nenergy conversion systems in the real-time....
Linear wave energy converters generate intrinsically intermittent power with variable\nfrequency and amplitude. A composite energy storage system consisting of batteries and super\ncapacitors has been developed and controlled by buck-boost converters. The purpose of the\ncomposite energy storage system is to handle the fluctuations and intermittent characteristics of\nthe renewable source, and hence provide a steady output power. Linear wave energy converters\nworking in conjunction with a system composed of various energy storage devices, is considered as\na microsystem, which can function in a stand-alone or a grid connected mode. Simulation results\nhave shown that by applying a boost H-bridge and a composite energy storage system more power\ncould be extracted from linear wave energy converters. Simulation results have shown that the\nsuper capacitors charge and discharge often to handle the frequent power fluctuations, and the\nbatteries charge and discharge slowly for handling the intermittent power of wave energy converters.\nHardware systems have been constructed to control the linear wave energy converter and the\ncomposite energy storage system. The performance of the composite energy storage system has been\nverified in experiments by using electronics-based wave energy emulators....
This paper mainly studies Weather Stations part of the wind power station.\nThe use of wind energy in practice is carried out using the facilities of the\nwind in which the kinetic energy of the windscreen flow is converted into\nmechanical energy wind speed, then electrical energy alternator. The effective\noperation of the wind turbine is dependent on the direction of the wind.\nSpeed air density, which in turn depends on the temperature and humidity.\nThus, the speed of the wind worked effectively in its composition must include\nthe weather. Meteorological station also performs the role of prevention.\nWhen the sharp wind speed or increase wind speed above the maximum value,\nit sends a signal to the lock assembly wind to prevent wind turbine technology\nfrom damage. The work of the meteorological stations design as part of the\nWind Energy Station is considered. The complex technical devices are used for\nits implementation. A set of technical means used to its implementation and designed\nsystem consists of a temperature, humidity, wind speed, wind direction\nand rain gauge sensors that are connected to PIC16f876A microcontroller....
In this paper, the control scheme of a distributed high-speed generator system with a total\namount of 12 generators and nominal generator speed of 7000 minâË?â??1 is studied. Specifically, a fault\ntolerant control (FTC) scheme is proposed to keep the turbine in operation in the presence of up\nto four simultaneous generator faults. The proposed controller structure consists of two layers:\nThe upper layer is the baseline controller, which is separated into a partial load region with the\ngenerator torque as an actuating signal and the full-load operation region with the collective pitch\nangle as the other actuating signal. In addition, the lower layer is responsible for the fault diagnosis\nand FTC characteristics of the distributed generator drive train. The fault reconstruction and fault\ntolerant control strategy are tested in simulations with several actuator faults of different types....
Strong shock waves can be generated by pulse discharge in water, and the characteristics due to the shock wave normal reflection\nfrom rigid walls have important significance to many fields, such as industrial production and defense construction. This paper\ninvestigates the effects of hydrostatic pressures and perturbation of wave source (i.e., charging voltage) on normal reflection of onedimensional\nunsteady flow shock waves. Basic properties of the incidence and reflection waves were analyzed theoretically and\nexperimentally to identify the reflection mechanisms and hence the influencing factors and characteristics. The results indicated\nthat increased perturbation (i.e., charging voltage) leads to increased peak pressure and velocity of the reflected shock wave,whereas\nincreased hydrostatic pressure obviously inhibited superposition of the reflection waves close to the rigid wall. The perturbation\nof wave source influence on the reflected wave was much lower than that on the incident wave, while the hydrostatic pressure\nobviously affected both incident and reflection waves. The reflection wave from the rigid wall in water exhibited the characteristics\nof a weak shock wave, and with increased hydrostatic pressure, these weak shock wave characteristics became more obvious....
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