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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The equivalent circuit developed for non fault conditions is presented in figure 7. Overvoltage of the third harmonic component Scheme 2 This scheme is based on the measurement of the third harmonic of voltage at the terminal connection of the generator, see figure 5.
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Finally, Cn corresponds to Cgwhile Ct is equivalent to 1-k Cg. 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. Moreover, if a stator ground fault close genwradores 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.
In such cases where the curve which relates the normal value of the third harmonic voltages and the generator load is not available, the voltage threshold based strategy helps to implement a generaeores constrained application using the undervoltage scheme. In the case of the scheme 3 ratio of the third harmonicthe relation presented in equations 12 and 3 were tested, as it is present in figure 15 as scheme 3 sinvronosscheme 3 2 and Scheme 3 3respectively.
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 13, 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 Department of Industrial Electrical Engineering and Automation. How to cite this article. Rn is the ground resistor. This characteristic is desirable because it is useful to detect possible problems in the insulation level of the synchronous generator.
Theoretical analysis for the non fault model The equivalent circuit developed for non fault conditions is presented in figure 7. Evaluation of voltage sag ride-through of a doubly fed induction generator wind turbine with series grid side converter. Figure 13 Alarm-trip logic used for the undervoltage scheme 1 or overvoltage scheme 2 of the third harmonic component.
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This harmonic magnitude varies according to the load level, the measurement point and the fault location along the winding. In figure 8 it is possible to see this zero-sequence circuit obtained from figure 7where Rn is the grounding resistor, Cg is the phase capacitance to ground of the generator stator winding, Cp is the total external phase capacitance of the system as seen from the generator, and E 3 is the generated third harmonic voltage.
Such devices have to be installed together to the classical ground fault protection for covering all of the stator winding. Finally, this work may help to develop useful protective devices which detect ground faults at the synchronous generator stator windings. 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.
Revista Tecnura – U. 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 Figure 4 Protective scheme used to detect under voltage of the third harmonic.
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Ratio of the third harmonic components Scheme 3. 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.
Finally, the use of the ratio scheme shows an interesting behavior making possible the detection of high impedance faults. 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. In this paper, three different relations as the presented from 1 to 3 are analyzed.
Figure 2 Magnitude of the third harmonic at the stator winding considering a ground fault in the neutral.
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First, the basic aspects of the analyzed methods are presented. Finally, the different schemes were tested in the case of nine values of third harmonic voltage nine different load conditions to cover all variation range.
These variations are particular for each one of the generator machines and are due small imperfections in the winding distribution during the fabrication process, which cause small voltage unbalances . System and method for attenuating noise associated with a back electromotive force signal in a motor. 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.
However an undetected stator ground fault near the neutral could develop into a phase to phase fault or turn to turn fault.