Browsing by Subject "wind turbine"

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    HYDRAULIC WIND POWER DROOP ANALYSIS
    (Office of the Vice Chancellor for Research, 2012-04-13) Sajadian, Sally; Pusha, Ayana; Izadian, Afshin
    The power transferred from the wind turbine to the generator is im-portant to keep the systems active, power balance and droop frequency con-trol when connected to a network. This is important to ensure maximum power output obtained from wind velocity. When there is a change present in the real power demand at a point in the network, it is reflected throughout the system by fluctuation in frequency. If a drop in frequency occurs the generator will decelerate at a rate determined by the moment of inertia plus all the masses connected to its shaft. This results in the conversion of kinet-ic energy of the generator to electrical energy thus giving a power surge. If there is an increase in the system frequency, the inverse is true. Hydraulic wind power provides opportunities for multiple wind turbine energy collection and central generation. The system has many benefits over direct driver counterparts including simple structure and opportunities for energy storage units. However, as the system relies on hydraulic connection of wind turbine and generators, it exhibits a nonlinear power and speed characteristics. This poster will analyze the effect of increasing the hydraulic wind turbines on the droop characteristics of the system. Several wind speeds and loading conditions have determined that adding wind turbines to the hydraulic energy transfer system will increase the frequency stability of the system. Some of the hydraulic prime mover characteristics will be identi-fied through experimental results from our prototype in Dr. Izadian’s labora-tory. This research was supported by IUPUI Solution Center.
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    Modeling of a Hydraulic Wind Power Transfer Utilizing a Proportional Valve
    (IEEE, 2015-03) Deldar, Majid; Izadian, Afshin; Vaezi, Masoud; Anwar, Sohel; Department of Mechanical Engineering, School of Engineering
    Hydraulic circuits can transfer remarkable amounts of energy in the desired direction without taking large space. To implement this technology for harvesting the energy of wind appropriately, models of the system are required. Hydraulic wind power technology has the benefits of eliminating expensive and bulky variable ratio gearbox and its costly maintenance, while enabling the integration of multiple wind turbines in a single generation unit. In this paper, the dynamics of different hydraulic elements are studied, nonlinearities are taken into account, pressure dynamics in different parts of the system are studied, and the motor load effects are considered. Based on these considerations, a novel nonlinear state-space representation of the system is introduced. Results of the mathematical model and the experimental data are compared to verify the proposed model. The comparison demonstrated that the mathematical model captures all major characteristics of the hydraulic circuit and can model the system behavior under different operating conditions.