نتایج جستجو برای: electrical parameters of synchronous generators
تعداد نتایج: 21194955 فیلتر نتایج به سال:
The present study shows that adult rat transverse slices from the ventral hippocampus perfused with standard medium persistently generate spontaneous synchronous field potentials. In CA1 st. pyramidale this regular ventral hippocampus spontaneous synchronous activity (VHSSA) was positive with mean amplitude 0.18 ^ 0.02 mV (n 1⁄4 80 slices) and occurred every 0.48 ^ 0.02 s. Simultaneous intracel...
a semi-empirical mathematical model for predicting physical part of ignition delay period in the combustion of direct - injection diesel engines with swirl is developed . this model based on a single droplet evaporation model . the governing equations , namely , equations of droplet motion , heat and mass transfer were solved simultaneously using a rung-kutta step by step unmerical method . the...
abstract objectives gradual increase length and complexity of utterance (gilcu) therapy method is a form of operant conditioning. this type of treatment is very precise and controlled that is done in 54 steps in 3 speech situations consisted of monologue, reading and conversation. this study aimed to examine the effects of gilcu treatment method on reduction of speech dysfluency of school-age...
Wind Energy Conversion Systems (WECS) have become a focal point in the research of renewable energy sources. This paper provides then a comparative study of past and present generator technologies used in WECS. This study is based on an exhaustive review of the state of the art and on an effective comparison of the performances of the four main topologies that are permanent magnet generators, s...
This paper provides a practical method for estimating structural mechanical damping in sub-synchronous torsional interaction (SSTI) analysis with limited information on the generators. The risk of SSTI is generally assessed by comparing turbine generator that electrical system problematic mode frequency domain followed time simulation studies to confirm occurrence interaction. Unfortunately, of...
Among the several wind generation technologies, variable-speed wind turbines utilizing doubly fed induction generators (DFIG) are gaining momentum in the power industry. Increased penetration of these wind turbine generators displaces conventional synchronous generators which results in erosion of system frequency. With this assertion, the paper analyzes the dynamic participation of DFIG for fr...
The virtual synchronous generator (VSG) technique is used to simulate the external characteristics of a (SG) provide certain damping and inertia power systems. However, it may easily cause low-frequency oscillation system. We studied small-signal stability grid-connected generator. Firstly, models single-VSG multi-VSG systems were established. Subsequently, system eigenvalues obtained by solvin...
Synchronous generator (SG) plays a vital and critical role in the power system by supplying electric to consumers. Various faults SGs can cause some catastrophic events such as disruption or blackout. These be classified into two electrical mechanical faults. Short circuit stator windings field winding are fault while bearing, static/dynamic eccentricity, broken damper bars one. Unlike inductio...
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