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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Similarly, the admittances Y 1 and Y 2 have the same meaning. Overvoltage of the third harmonic component Scheme 2.
Test system To obtain the proposed comparison, a real generator machine is used in tests and these parameters are the presented in table 1. Decentralized parallel operation of inverters sharing unbalanced and nonlinear loads. Sincronnos Institute of Technology. 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.
Fault resistance estimation using the alarmtrip logic. 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.
Finally, this egneradores may help to develop useful protective devices which detect ground faults at the synchronous generator stator windings. This paper focuses on the application of the third harmonic principle and is devoted to present a comparative analysis and an improvement of three different approaches. In such cases where the curve which relates the normal beneradores of the third 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.
Electric Machinery Company – Generadores Sincrónicos
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. 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.
Revista Tecnura – U. As sincfonos before, equations from 8 to 11 are obtained by applying the Millman theorem to the system presented in figure Voltage Va is obtained as it is presented in 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 generacores 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.
In figure 6 the ratio scheme is presented [7, 11, 12]. Control scheme of three-level NPC inverter for integration of renewable energy resources into AC grid. 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 gfneradores krespectively.
EST3 – Generadores síncronos estáticos – Google Patents
However an undetected stator ground fault near the neutral could develop into a phase to phase fault or turn to turn fault. All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.
Modulation and control of three-phase paralleled Z-source inverters for distributed generation applications. Verfahren und Schaltungsanordnung zur sensorlosen, elektrischen Rotorlagemessung einer permanent erregten Synchronmaschine.
The use of the 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.
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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. Ratio of the third harmonic components Scheme 3.
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. Aceptado el genefadores de enero de Design of a robust grid interface system for PMSG-based wind turbine generators.
Finally, figure 9 is obtained as a simplification of figure 8.
This circuit was solved according to the Millman theorem properties, and it is graphically presented in figure 11 . Figure 8 Zero-sequence circuit Figure 9 Simplified zero-sequence circuit Solving circuit proposed in figure 9equations 6 and 7 are then obtained for sincronls voltage at the neutral and terminals, respectively.
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 generadorss Figure Finally and considering a ground fault at the generator terminals, the effect is the opposite of the previously described.
English pdf Article in xml format Article references How to cite this article Automatic translation Send this article by e-mail. 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.
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. 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 1scheme 3 2 and Scheme 3 3respectively.
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CONTROL DE FRECUENCIA EN GENERADORES SÍNCRONOS by Juan Camilo Valderrama on Prezi
Figure 14 Third harmonic voltage typical variations caused by changes in the output active power. Figure 10 Equivalent synchronous generator model considering fault conditions Figure 11 Simplified circuit using Millman theorem Finally, Cn corresponds to Cgwhile Ct is equivalent to 1-k Cg. 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.
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.
The use of the overvoltage strategy in not useful due the restrictions associated to the overlapping of several values of the third harmonic voltages in normal operating conditions with such values in case of stator ground faults.