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Bibliographic Details
Main Author:	Ana María Pérez L.
Format:	Artículo científico
Language:	es
Published:	Universidad Tecnológica de Pereira 2007
Subjects:	Ingeniería estabilidad ángulo de carga Generador síncrono
Online Access:	https://www.redalyc.org/articulo.oa?id=84934007
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Determinación en línea del ángulo de carga de un generador síncrono Ana María Pérez L. Yimy Alexander Romero Sandra Milena Pérez L. Ingeniería estabilidad ángulo de carga Generador síncrono Para realizar estudios de estabilidad de los sistemas eléctricos de potencia esnecesario disponer de modelos de los diferentes elementos componentes, entrelos cuales se encuentra la máquina síncrona. Generalmente estos modelos sonpresentados en función de los parámetros de la máquina, los cuales pueden serdados por el fabricante, obtenerse mediante ensayos o mediante técnicas deidentificación en línea. En estas ultimas metodologías, es necesario disponer dela medida del ángulo de carga para todo instante de tiempo, debido a queparámetros como las reactancias de eje directo y eje en cuadratura dependensustancialmente de esta variable. Para este caso es necesario disponer dehardware y software específico para determinar esta variable.En este documento se presenta una metodología basada en un microcontroladorpara determinar el ángulo de carga. La estimación del ángulo está basada en laposición relativa del eje del rotor y del voltaje terminal de la máquina. Al final sepresentan los resultados obtenidos para una máquina síncrona a escala existenteen el laboratorio. 2007 artículo científico 0122-1701 https://www.redalyc.org/articulo.oa?id=84934007 es http://www.redalyc.org/revista.oa?id=849 Scientia Et Technica application/pdf Universidad Tecnológica de Pereira Scientia Et Technica (Colombia) Num.34 Vol.XIII

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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