This paper presents a method to seek the PI controller parameters of a PMSG wind turbine to improve control performance. Since operating conditions vary with the wind speed, therefore the PI controller parameters should be determined as a function of the wind speed. Small-signal modeling of a PMSG WT is implemented to analyze the stability under various operating conditions and with eigenvalues...

BACKGROUND The effect of hormonal estrus induction on maternal effect (MATER - maternal antigen that embryo requires, ZAR-1 - zygote arrest 1, and BMP15 - bone morphogenetic protein 15) and apoptosis-related genes expression (BCL-2 and BAX) in porcine cumulus-oocyte complexes (COCs) and selected follicular parameters was investigated in this study. METHODS Gilts were divided into three groups...

An experiment was conducted using indigenous Kivircik ewes to evaluate the effect of intravaginal progestagen sponges, containing 30 mg of fluorogestone acetate (FGA), followed by administration of pregnant mare serum gonadotrophin (PMSG) on inducing synchronized oestrus in the season and fertility. Three times of PMSG administration relative to sponge withdrawal (24 h before (n = 30), at (n = ...

Hamster one-cell embryos were collected from two groups of donors: females that were super-stimulated with pregnant mare's serum gonadotrophin (PMSG) and females that were not. Embryos were cultured for 72 h and scored for development. Morulae and blastocysts from the PMSG- and non-stimulated females were transferred into contralateral uterine horns of non-stimulated recipient females, so that ...

This paper summarizes research dealing with the induction of spontaneous superovulation in the cyclic hamster by single injections of PMSG. Four principal approaches have been used : 1) ovulation rate as an endpoint ; 2) number and size of follicles, and staging of follicular development in serially sectioned ovaries ; 3) determining the effects of an antiserum to PMSG ; 4) measuring steroid an...

Space Vector Modulation (SVM) based Direct Torque Control (DTC) scheme is used for a variable –speed direct drive Permanent Magnet Synchronous Generator (PMSG) in a wind power generation system. SVM Provides more flexibility for inverter voltage utilization, in order to compensate the torque and flux errors in a smoother way than conventional DTC. SVM based DTC maintains constant switching freq...

This paper proposes adaptive Maximum Power Point Tracking (MPPT) controller for Permanent Magnet Synchronous Generator (PMSG) wind turbine and direct power control for grid side inverter for transformer less integration of wind energy. PMSG wind turbine with two back to back voltage source converters are considered more efficient, used to make real and reactive power control. The optimal contro...

Renewable Energy Sources (RES) are nowadays growing rapidly at the distribution level and it employs power electronic converters to ensure reliable operation to the customers. Among the RES, wind energy is now firmly established technology for electricity generation. This paper proposes a conventional PI controller and Artificial Neural Network (ANN) controller to GSC of PMSG, which can obtain ...

Wind is one of the most prominent renewable sources of energy. Wind energy conversion system (WECS) is based on a variable speed wind turbine with direct driven permanent magnet synchronous generator (PMSG) and transmits its electrical power to an AC grid using advanced power electronic converter system. This paper describes operation and control of variable speed WECS based on gearless PMSG to...

Twelve immature female monkeys were treated with varying amounts of pregnant mare's serum gonadotrophin (pmsg). Seven of these monkeys responded to pmsg treatment as shown by sex skin development, ovarian enlargement and withdrawal bleeding. These animals reached menarche between 23 and 26 months of age, almost 1 year earlier than untreated control monkeys. Five other animals did not show