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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This harmonic magnitude varies according to heneradores load level, the measurement point and the fault location along the winding.

There is a Hz relay tuned to detect third harmonic voltage and a standard 50Hz relay tuned to the fundamental frequency. Revista Tecnura – U. 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.

Ratio of the third harmonic components Scheme 3.

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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. A similar strategy is used to determine those faults that could be detected using the overvoltage scheme, but considering values of terminal voltage Generadires which are higher than the maximum voltage during normal operating conditions.

Considering that the third harmonic voltages are strongly related to the generator load as it is graphically presented in figure 14it is important to determine how this dependence affects the detectable values of the fault resistance in all of the analyzed protection schemes. Sincrohos faults at the synchronous machine stator are common and these cause current flows through the neutral conductor. Finally, the alarm-trip logic used in the case of scheme 3 is based on the definition of the maximum non trip voltages at the neutral and the terminals defined by the schemes 1 and 2, and by using one of the equations presented form 1 to 3.

### GENERADORES SINCRONOS by Jorge Rosas on Prezi

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 by table 1. Methodology Method of third harmonic This method uses a comparison of the third order component of the voltage measured generxdores the synchronous generator terminal Vt or at the neutral Vn connections.

The three previously described protective schemes are here analyzed according to two models, previously developed to represent the stator winding equivalent circuit [7]. As a proposed improvement using the alarm-trip logic presented, it is notice how the capability to detect high impedance faults using the analyzed methods is increased Figure A stator ground fault close to the neutral point is not immediately catastrophic because: However an undetected stator ground fault near the neutral could develop into a phase to phase fault or turn to turn fault.

Figure 1 Magnitude of the third harmonic at the stator winding considering non fault situations. Solving circuit proposed in figure 9equations 6 and 7 are then obtained for the voltage at the neutral and terminals, respectively. All of the possible variations of the third harmonic voltage due to changes on the connected load and errors in the meters are considered for this analysis.

This scheme is based on the measurement of the third harmonic of voltage at the terminal connection of generadroes generator, see figure generadoers.

Figure 10 Equivalent synchronous generator model considering fault conditions Figure 11 Simplified circuit using Millman theorem Finally, Cn corresponds to Cgwhile Ct is equivalent to 1-k Cg. Verfahren und Schaltungsanordnung zur sensorlosen, elektrischen Rotorlagemessung einer permanent erregten Synchronmaschine. In this method, the third harmonic voltage is measured at the neutral. Finally, the use of the ratio scheme shows an interesting behavior making possible the detection of high impedance faults.

### Sistema de potencia con 4 generadores sincronos. – File Exchange – MATLAB Central

How to cite this article. Fault resistance estimation using the voltage thresholds The first strategy is based on the determination of the normal values of the third harmonic of voltage at generadored terminals and the neutral of the synchronous generator. Grid-side converter control of DFIG wind turbines to enhance power quality of distribution network.

The logic used to determine the presence of trip or alarm for both, under and overvoltage of the third harmonic component schemes 1 and 2, respectivelyis presented in figure sincrronos, and it is based on the comparison of the values of the third harmonic of the voltage measured denoted with the additional subindex m and those normal values as the present in figure Similarly, the admittances Y 1 and Y 2 have the same meaning.

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Figure 8 Zero-sequence circuit Figure 9 Simplified zero-sequence circuit Solving circuit proposed in figure 9equations 6 and 7 are then obtained for the voltage at the neutral and terminals, respectively. From figure 11V 1 and V 2 are the equivalent voltages as seen from the left and the right generdaores of E3n at the faulted winding. First, the basic aspects of the analyzed methods are presented.

The equivalent circuit developed for non fault conditions is presented in figure 7. John Wiley and Sons. From the results obtained in a real synchronous generator there are advantages of the scheme based on the ratio of the voltages measured at terminals and neutral, in the case of using the voltage threshold strategy.

System and method for commutating a motor using back electromotive force signals. Figure 12 Equivalent circuit used to find Vt and Vn. Figure 4 Protective scheme used to detect under voltage of the third harmonic Figure 5 Protective scheme using over voltage of the third harmonic Ratio of the third harmonic components Scheme 3 This method is based on the comparison of third harmonic voltages using several mathematic relations which should make the protective device more susceptible to the variation of these voltages.

This method is based on the comparison of third harmonic voltages using several mathematic relations which should make the protective device more susceptible to the variation of these voltages. Figure 15 Maximum fault resistance values detectable by the protective methods using the alarmtrip logic Undervoltage, overvoltage and ratio of the third harmonic of voltage.

As described before, equations from 8 to 11 are obtained by applying the Millman theorem to the system presented in figure Autonomous control of interlinking converter with energy storage in hybrid AC—DC microgrid.

Figure 12 shows an equivalent circuit obtained from figure 11where Va is the equivalent voltage obtained at the right side of the source E 3n. All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution Generadroes. As generxdores mentioned before, the third harmonic voltage appears as zero-sequence quantities. This circuit was solved according to the Millman theorem properties, and it is graphically presented in figure 11 [13].

Figure 4 Protective scheme used to detect under voltage of the third harmonic.

Theoretical analysis of the faulted model The equivalent circuit developed to consider under faulted conditions is presented in figure 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.

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 genfradores, respectively.

## ES2548786T3 – Generadores síncronos estáticos – Google Patents

Figure 2 Magnitude of the third harmonic at the stator winding considering a ground fault in the neutral Figure 3 Magnitude of the third harmonic at the stator winding considering a ground fault in terminals Undervoltage of the third harmonic component Scheme 1 This scheme is based on the measurement of the third harmonic generafores of voltage at the neutral connection of the synchronous generator, as presented in figure 4. Considering a ground fault at the neutral connection, the third harmonic at this node decreases to zero.

The two previous schemes normally use a relay 27H able to determine frequencies from to Hz. Method and system for rapid modeling and verification of excitation systems for synchronous generators.

Generaadores use sincrlnos the proposed alarm-trip logic is an interesting alternative which helps to improve the protection performance, making possible the detection of high impedance faults in all of the three third harmonic based schemes.