del sistema de turbina-generador instalado. Producción. Nuestro centro de producción (Orléans, Francia) está equipado con máquinas de tecnología punta. Los generadores síncronos constituyen el equipo más costoso en un sistema de potencia. Como consecuencia de los posibles fallos que se presentan tanto. CONTROL DE FRECUENCIA EN GENERADORES SÍNCRONOS Carol Sánchez Mateo Rodríguez Fredy Salazar Luz Dary Garcia Universidad.
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Poland Developments in Power System Protection.
Electric Machinery Company – Generadores Sincrónicos
Although a first fault normally does not cause any problem, this have to be removed before the occurrence of a second ground fault which could cause severe machine damages and the consequent outage.
However, by using the proposed alarm-trip logic, remarkable improvements could be obtained in the case of detecting high impedance ground faults. Overvoltage of the third harmonic component Scheme 2 This scheme is based on the measurement of genfradores third harmonic of voltage at the terminal connection of the generator, see figure 5.
Moreover, if a stator ground fault close to the neutral point remains undetected, it bypass the grounding resistor and the conventional protection, and then a second ground fault toward the terminal could lead to catastrophic consequences.
The results help to validate the system behavior by a comparison of the values obtained for the third harmonic voltage measured at the ground connection Vn and these measured at the machine terminals Vt with those obtained by using equations 6714 and 15 considering the real machine parameters given generadorfs table 1. In this paper, three different relations as the presented from 1 to 3 are analyzed.
Sistema de potencia con 4 generadores sincronos. – File Exchange – MATLAB Central
Autonomous control of interlinking converter with energy storage in hybrid AC—DC microgrid. In all of the situations, the voltage at the neutral Vn was measured and these values genwradores are lower than minimum voltage normal operating conditions correspond to faults which could be detected in the case of scheme 1. Power System Relaying Committee. Rn is the ground resistor.
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Schemes 2 and 3 Overvoltage and ratio of the third harmonic components, respectively have a better performance according to the analyzed cases, because the capability to detect high fault resistances is higher than in the case of scheme 1. The first strategy is based on the determination of the normal values of the third harmonic of voltage at the terminals and the neutral of the synchronous generator.
This relay detects variations at the magnitude of the third harmonic causing alarm or trip. Ground faults at the synchronous machine stator are common and these cause current flows through the neutral conductor.
Grid-side converter control of DFIG wind turbines to enhance power quality of distribution network.
Control scheme of three-level NPC inverter for integration of renewable energy resources into AC grid. The use of the overvoltage strategy in not useful due the restrictions associated to the overlapping of several values of the third harmonic voltages in normal operating conditions with such values in case of stator ground faults. In the above equations, V 3n corresponds to the third harmonic voltage at the generator neutral and V 3t is the third harmonic voltage at the generator terminals.
Table 2 Maximum fault resistance skncronos detectable by the analyzed protective methods using the voltage thresholds Undervoltage, overvoltage and ratio of the third harmonic of voltage. Similarly, the admittances Y 1 and Y 2 have the same meaning. Figure 14 Third harmonic voltage typical variations caused by changes in the output active power.
In figure 6 the ratio scheme is presented [7, 11, 12]. The equivalent circuit developed for non fault conditions is presented in figure 7. Figure 7 Equivalent synchronous generator model considering non fault conditions Following, from figure 9 and using the proposed equations presented in 4 and 5 it is possible to obtain the impedances at the terminal and neutral nodes, respectively. Theoretical evaluation of the non-faulted and faulted models. However an undetected stator ground fault near the neutral could develop into a phase to phase fault or turn to turn fault.
Lund Institute of Technology.
In the case of the overvoltage of the third harmonic scheme 2there is not possible to detect any ground fault because the overlapping of the normal operation range values of the third harmonic and those values measured in case of faults. Ratio generadoree the third harmonic components Scheme 3.
CONTROL DE FRECUENCIA EN GENERADORES SÍNCRONOS by Juan Camilo Valderrama on Prezi
Additionally, E 3n corresponds to kE 3 and E 3t is associated to 1-k E 3where both are the third harmonic voltages produced by the stator winding between the generator neutral and the ground-fault location k, and between the generator terminal and the ground fault location krespectively. Finally, this work may help to develop useful protective devices which detect ground faults at the synchronous generator sinncronos windings. Figure 8 Zero-sequence circuit Figure 9 Simplified zero-sequence circuit Solving circuit proposed in figure 9equations heneradores and 7 are then obtained for the voltage at the neutral and terminals, respectively.
According to preliminary test performed in the proposed real synchronous generator, the obtained values for the maximum fault resistances which are detectable by using each one of the three proposed schemes are presented in table 2. Finally, the sincronoa of the ratio scheme shows an interesting behavior making possible the detection of high impedance faults.
In figure 8 it is possible to see this zero-sequence circuit obtained from figure 7where Rn is the grounding resistor, Cg is generadoges phase capacitance to ground of the generator stator winding, Cp is the total external phase capacitance of the system as seen from the generator, and E 3 is the generated third harmonic voltage.