Browsing by Author "Pusha, Ayana"

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    EFFICIENCY AND LOSS CALCULATIONS OF A GEARLESS WIND POWER TRANSFER SYSTEM
    (Office of the Vice Chancellor for Research, 2012-04-13) Pusha, Ayana; Izadian, Afshin
    A gearless hydraulic wind energy transfer system utilizes the hydraulic power transmission principles to integrate the energy of multiple wind tur-bines in a central power generation location. A Hydraulic Transmission (HT) can transmit high power and can operate over a wide range of torque-to-speed ratios, allowing the transmission of intermittent wind power. The torque to speed ratios illustrates the relationship between the torque and speed of a motor (or pump) from the moment of start to when full-load torque is reached at the rated speed, provided by the manufacturer. This ra-tio determines the power capacity of the motor (or pump). The efficiency of a HT is dependent on several parameters including volu-metric flow rate, rotational speed and torque at the pump shaft, and the pressure difference across the inlet and outlet of the hydraulic pump and motor. In this poster, experimental data will be collected to determine the efficiency of a closed loop hydraulic transmission that integrates multiple wind turbines. The configuration will be modified to include multiple pumps and motors to determine how the efficiency of the system can be improved. This research was supported by IUPUI Solution Center.
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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.