### GENERADORES SINCRONOS PDF

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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A Virtual Synchronous Machine implementation for distributed control of power converters in SmartGrids. 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. The equivalent circuit developed for non fault conditions is presented in figure 7.

Figure 14 Third harmonic voltage typical variations caused by changes in the output active power. The two previous schemes normally use a relay 27H able to determine frequencies from to Hz.

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

System and method for commutating a motor using back electromotive force signals. To obtain the proposed comparison, a real generator machine is used in tests and these parameters are the presented in table 1. Figure 1 Magnitude of the third harmonic at the stator winding considering non fault situations Considering generadords ground fault at the neutral connection, the third harmonic at this node decreases to zero.

A similar strategy is used to determine those faults that could be detected using the overvoltage scheme, but considering values of terminal voltage Vt which are higher than the maximum voltage during normal operating conditions. John Wiley and Sons. Modulation and control of three-phase paralleled Z-source inverters for distributed generation applications.

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.

The high impedance method is frequently used because in the case of faults generasores current magnitude generadofes relatively low [1, 2]. Poland Developments in Power System Protection.

## Electric Machinery Company – Generadores Sincrónicos

Finally, figure 9 is obtained as a simplification of figure 8. 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.

Figure 1 shows the third harmonic voltage distribution generated along the stator windings generaodres normal operating conditions, considering variations in the machine load [4, 5].

The flowing current I is then obtained as it is presented in These three different methods are based in voltage measurements at the neutral and terminal gejeradores, and also in the ratio of these measurements. This harmonic magnitude varies according to the load level, the measurement point and the fault location along the winding.

Where i indicates the imaginary operator and f is the power frequency. As is mentioned before, the third harmonic voltage appears as zero-sequence quantities. Voltage Va is obtained as it is presented in First, the basic aspects of the analyzed methods are presented. Figure 1 Magnitude of the third harmonic at the stator winding considering non fault situations.

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. 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.

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. 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.

As proposed improvement of the protection method, the alarm-trip logic previously explained is considered to determine the maximum values of fault resistance sincronoss could be detected in the case generdores ground faults. Finally, Cn corresponds to Cgwhile Ct is equivalent to 1-k Cg. Revista Tecnura – U.

Finally, the alarm-trip logic proposed helps to deal with the variation in the magnitude of the third harmonic of voltage caused by load changes as it is presented in figures 23 and However, by using the proposed alarm-trip logic, remarkable improvements could be obtained in the case of detecting high impedance ground faults. 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.

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. Finally, the use of the ratio scheme shows an interesting behavior making possible the detection of high impedance faults. Sincrnos equivalent circuit developed to consider under faulted conditions is presented in figure 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.

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

Ciudad Universitaria Calle 67 No. Finally, this work may help to develop useful protective devices which detect ground faults at the synchronous generator stator windings. Decentralized parallel operation of inverters sharing unbalanced and nonlinear loads.