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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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Finally, figure 9 is obtained as a simplification of figure 8. In the case of the scheme 3 ratio of the third generadotesthe relation presented in equations 12 and 3 were tested, as it is present in figure 15 as scheme 3 1scheme 3 2 and Scheme 3 3respectively.

Figure 10 Equivalent synchronous generator model generradores fault conditions Figure 11 Simplified circuit using Millman theorem Finally, Cn corresponds to Cgwhile Ct is equivalent to 1-k Cg. This method uses a comparison of the third order component of the voltage measured at the synchronous generator terminal Vt or at the neutral Vn connections. 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.

Figure 5 Protective scheme using over voltage of the third harmonic. 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 Fault resistance estimation using the alarmtrip logic As proposed improvement of the protection method, the alarm-trip logic previously explained is considered to determine the maximum values of fault resistance which could be detected in the case of ground faults.

Then, the main results and a comparative analysis are presented, and finally the main conclusions are presented. Ground faults at the synchronous machine stator are common and these cause current flows through the neutral conductor. Using the classical thresholds strategy to determine the maximum fault resistance to be generarores in the case of the undervoltage scheme, different fault situations were analyzed using the circuit presented in figure 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 sincronod neutral and terminals, respectively.

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

The two previous schemes normally use a relay 27H able to determine frequencies from to Hz. Validation of the proposed third harmonic generator models. The obtained results shows small variations in the maximum fault resistance detected, showing the reduced dependence of the proposed protection strategy and the synchronous generator load condition.


Figure 1 Magnitude of the third harmonic at the stator winding considering non fault situations. 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.

However an undetected stator ground fault near the neutral could develop into a phase to phase fault or turn to turn fault. This circuit was solved according to the Millman theorem properties, and it is graphically presented in figure 11 [13].

Finally, the use of the ratio scheme shows an interesting behavior making possible the detection of high impedance faults. Modulation and control of three-phase paralleled Z-source inverters for distributed generation applications. Aceptado el 8 de enero de Equivalent circuit generadofes coil incorporated in circuit simulator, circuit simulator and method of preparation of same, and storage medium of circuit simulator program.

The flowing current I is then obtained as it is presented in Then the third harmonic voltage produced by the synchronous generator is distributed between the terminal and the neutral shunt impedances governing the zero-sequence.

In the above equations, V 3n corresponds to the third harmonic voltage at the generator neutral and V 3t is the third harmonic generadoers at the generator terminals. Figure 2 Magnitude of the sincrinos harmonic at the stator winding considering a ground fault in the neutral.

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 Electromechanical transient modeling of snicronos multilevel converter based multi-terminal HVDC systems. Grid-side converter control of DFIG wind turbines to enhance power quality of distribution network. Where i indicates the imaginary operator and f is the power frequency.

How to cite this article. Cg is the phase capacitance of the generator stator winding to ground; Cp is the total external phase capacitance of the system as seen from the generator.

EST3 – Generadores síncronos estáticos – Google Patents

There is a Gdneradores relay tuned to detect third harmonic voltage and a standard 50Hz relay tuned to the fundamental frequency. From figure 11V 1 and V 2 are the equivalent voltages as seen from the left and the right sides of E3n at the faulted winding. Fault generxdores estimation using the voltage thresholds 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 nodes, respectively. 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.


These three different methods are based in voltage measurements at the neutral and terminal connections, and also in the ratio of these measurements. Considering a ground fault at the neutral connection, the third harmonic at this node decreases to zero.

In this paper, three different relations as the presented from 1 to 3 are analyzed.

Electric Machinery Company – Generadores Sincrónicos

Figure 3 Magnitude of the third harmonic at the stator winding considering a ground fault in terminals. Figure 14 Third harmonic voltage typical variations caused by changes in the output active power. Table 1 Typical values for a unit-connected generator. 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.

In the case of the ratio scheme, the values of the third harmonic measured during faults are compared with those generadorws in the case of non fault situations, and as a consequence the dependence on the load is greatly reduced considering the division of the voltages at the neutral and the terminals as proposed from equation 1 to 3.

System and method for attenuating noise associated with a back electromotive force signal in a motor. 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 generacores.

First, the basic aspects of the analyzed methods are presented. 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.

In the proposed test system, the normal operating ranges were determined for both the third harmonic of voltage at the neutral Vn and at the terminals Vtby varying the load from zero to the nominal value. Services on Demand Article. Method and system for rapid modeling and verification of excitation systems for synchronous generators.