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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Autonomous control of interlinking converter with energy storage in hybrid AC—DC microgrid.

However, geeradores using the proposed alarm-trip logic, remarkable improvements could be obtained in the case of detecting high impedance ground faults. The first model is the equivalent scheme of the system under normal condition operation while the second one is equivalent sincronps the system working under fault conditions.

Figure 1 shows the third harmonic voltage distribution generated along the stator windings during normal operating conditions, considering variations in the machine load [4, 5]. All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. The equivalent circuit developed to consider under faulted conditions is presented in figure Figure 1 Magnitude of the third harmonic at the stator winding considering non fault situations Considering a ground fault at the snicronos connection, the third harmonic at this node decreases to zero.

Equivalent circuit for coil incorporated in circuit simulator, circuit simulator and method of preparation of same, and storage medium of circuit simulator program.

To obtain the proposed comparison, a real generator machine is used in tests and these parameters are the presented in table 1. Finally, the alternative which uses the ratio of the third harmonic components scheme 3 as it is presented from equation 1 to 3due its high sensibility to the voltage variations could detect high resistance faults. Figure 13 Alarm-trip logic used for the undervoltage scheme 1 or overvoltage scheme 2 of the third harmonic component.

Then the third harmonic voltage produced by the synchronous generator is distributed between the terminal and the neutral shunt impedances governing the zero-sequence.

This scheme is based on the measurement of the third harmonic component of voltage at the neutral connection of the synchronous generator, as presented in figure 4. The behavior sinccronos the third harmonic voltage is described by curves as shown in figure 14 [7, 10]. 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.

Fault resistance estimation using the voltage thresholds.

### EST3 – Generadores síncronos estáticos – Google Patents

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, figure 9 is obtained as a simplification of figure 8. These three different methods are based in voltage measurements at the neutral and terminal connections, and also in the ratio of these measurements.

The high impedance method is frequently used because in the case of faults the current magnitude is relatively low [1, 2].

The three previously described protective schemes are here analyzed according to two models, previously developed to represent the stator winding equivalent circuit [7].

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 generxdores.

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Finally, the use of the ratio scheme shows an interesting behavior making possible the detection of high impedance faults. System and method for attenuating noise associated with a back electromotive force signal in a motor.

The equivalent circuit developed for non fault conditions is presented in figure 7. From the proposed equivalent, voltages at the neutral Vn and terminal Vt under fault conditions are obtained as it is presented in 14 and As is mentioned before, the third harmonic voltage appears as zero-sequence quantities.

Evaluation of voltage sag ride-through of a doubly fed induction generator wind turbine with series grid side converter. 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.

A stator ground fault close to the neutral point is not immediately catastrophic because: Figure 3 Magnitude of the third harmonic at the stator winding considering a ground fault in terminals.

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

Figure 12 shows an equivalent circuit obtained from figure 11where Va is the gejeradores voltage obtained at the right side of the source E 3n. Table 2 Maximum fault resistance values detectable by the analyzed protective methods using the voltage thresholds Undervoltage, overvoltage and ratio of the third harmonic of voltage.

Ciudad Universitaria Calle 67 No. Fault resistance estimation using the alarmtrip logic. Improvement of the third harmonic based stator ground fault protection for high resistance grounded synchronous generators. The two previous schemes normally use a relay 27H able to determine sibcronos from to Hz.

The current magnitude depends of the grounding type high, medium and low impedance. Table 1 Typical values for a unit-connected generator. Validation of genradores proposed third harmonic generator models.

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 dincronos using the voltage threshold strategy. In all of the situations, the voltage at the neutral Vn was measured and these values which are lower than minimum voltage normal operating conditions correspond to faults which could be detected in the case of scheme 1.

## ES2548786T3 – Generadores síncronos estáticos – Google Patents

Figure 14 Third harmonic voltage typical variations caused by changes in the output active power. Poland Developments in Power System Protection. This paper focuses on the application of the third harmonic principle and is devoted sincronls present a comparative analysis and an improvement of three different approaches.

However, the ratio based scheme helps to obtain the best performance in high impedance fault determination. In such cases where the curve which relates the normal value of the geneeradores harmonic voltages and the generator load is not available, the voltage threshold based strategy helps to implement a very constrained application using the undervoltage scheme. Department of Industrial Electrical Engineering and Automation.