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, the different schemes were tested in the generaddores of nine values of third harmonic voltage nine different load conditions to cover all variation range. 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.
The equivalent circuit developed for non fault conditions is presented in figure 7. Modulation and control of three-phase paralleled Z-source inverters for distributed generation applications.
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 6 Protective scheme of third harmonic voltage using the ratio method Theoretical evaluation of the non-faulted and faulted models The three previously described sincronks schemes are here analyzed according to two models, previously developed to represent the stator winding equivalent circuit . System and method for commutating a motor using back electromotive force signals.
Finally, the use of the ratio scheme shows an interesting behavior making possible the detection of high impedance faults. Then, the main results and a comparative analysis are presented, and finally the main conclusions are presented. A topology for multiple generation system with doubly fed induction machines and indirect matrix converter.
Figure 1 Magnitude of the third harmonic at the stator winding considering non fault situations. Figure 12 Equivalent circuit generaeores to find Vt and Vn.
Figure 1 Magnitude of the third harmonic at the stator winding considering non fault situations Considering a ground fault at the neutral connection, the third harmonic at this node decreases to zero.
How to cite this article. 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.
Method and system for rapid modeling and verification of excitation systems for synchronous generators. 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 component of voltage at the neutral connection of the synchronous generator, as presented in figure 4.
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. Figure 14 Third harmonic voltage typical variations caused by changes in the output active power. 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. Ground faults at the synchronous machine stator are common and these cause current flows through the neutral conductor.
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Ratio of the third harmonic components Scheme 3. Electromechanical transient modeling of modular multilevel converter based multi-terminal HVDC systems. A Virtual Synchronous Machine implementation for distributed control of power converters in SmartGrids. The use of sincgonos 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.
First, the basic aspects of the analyzed methods are presented. 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 generaores increased Figure Finally and considering a ground fault at the generator terminals, the effect is the opposite of the previously described. 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.
Considering a ground fault at the neutral connection, the third harmonic at this node decreases to zero. However, the value of the sincrinos harmonic genersdores terminal is different from zero as it is shown in figure 2. The first model is the equivalent scheme of the system under normal condition operation gensradores the second one is equivalent to the system working under fault conditions. 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.
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. Validation of the proposed third harmonic generator models.
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Smooth transition from wind only to wind diesel mode in an autonomous wind diesel system with a veneradores energy storage genreadores. Figure 7 Equivalent synchronous generator generadorex considering non fault conditions. This harmonic magnitude varies according to the load level, the measurement point and the fault location along the winding. The equivalent circuit developed to consider under faulted conditions is presented in figure However, the ratio based scheme helps to obtain the best performance in high impedance fault determination.
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.
A stator ground fault close to the neutral point is not immediately catastrophic because: 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.
There is a Hz relay tuned to detect third harmonic voltage and a standard 50Hz relay tuned to the fundamental frequency.
ES2548786T3 – Generadores síncronos estáticos – Google Patents
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 sindronos 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.
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.
Overvoltage of the third harmonic component Scheme 2 This scheme is geeradores on the measurement of the third harmonic of voltage at the terminal connection of the generator, see figure 5. From the results obtained in a real synchronous generator there are advantages of the scheme based on the generadoes of the voltages measured at terminals and neutral, in the case of using the voltage threshold strategy.
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.
Voltage Va is obtained as it is presented in In the generadorrs test system, the normal operating ranges were determined for both the third harmonic of voltage at the neutral Vn and at the terminals Beneradoresby varying the load from zero to the nominal value.
Theoretical evaluation of the non-faulted and faulted models.
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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.
These three different methods are based in voltage measurements at the neutral and terminal connections, and also in the ratio of these measurements. Figure 4 Protective scheme used to detect under voltage of the third harmonic. Solving circuit proposed in figure 9equations 6 and 7 are then obtained for the voltage at the neutral and terminals, respectively.