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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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.
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.
However, the value of the third harmonic at terminal is different from zero as it is shown in figure 2. John Wiley and Sons. The equivalent circuit developed for non fault conditions is presented in figure 7. First, the basic aspects of the analyzed methods are presented. Smooth transition from wind only to wind diesel mode in an autonomous wind diesel system with a battery-based energy storage system.
Improvement of the third harmonic based stator ground fault protection for high resistance grounded synchronous generators. In figure 8 it is grneradores 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.
Ciudad Universitaria Calle 67 No. Finally, figure 9 is obtained as a simplification of figure 8. Figure 15 Maximum fault resistance veneradores detectable by the protective methods using the alarmtrip logic Undervoltage, overvoltage and ratio of the third harmonic of voltage.
Services on Demand Article. Verfahren und Schaltungsanordnung zur sensorlosen, elektrischen Rotorlagemessung einer permanent erregten Synchronmaschine. To obtain the proposed comparison, a real generator machine is used in tests and these parameters are the presented in table 1.
According to the results, it is shown that the scheme 1 Undervoltage of the third harmonic component has a lower capability to detect the abnormal behavior in case of high resistant faults. Validation of the proposed third harmonic generator models. 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.
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. 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.
ES2548786T3 – Generadores síncronos estáticos – Google Patents
Fault resistance estimation using the voltage thresholds. However, the ratio based scheme helps to obtain the best performance in high impedance fault determination. The current magnitude depends of the grounding type high, medium and low impedance.
Electromechanical transient modeling of modular multilevel converter based multi-terminal HVDC systems. Modulation and control of three-phase paralleled Z-source inverters for distributed generation applications.
Such devices have to be installed together to the classical ground fault protection for covering all of the stator winding. This paper focuses on the application of the third harmonic principle and is devoted to present a comparative analysis and an genreadores of three different approaches.
A topology for multiple generation system with doubly fed induction machines and indirect matrix converter. Undervoltage of the third harmonic component Scheme 1. Using the classical thresholds strategy to determine the maximum fault resistance to be detected in the case of the undervoltage scheme, different fault situations were analyzed using the circuit presented in figure In this method, the third harmonic voltage is measured at the neutral.
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.
EST3 – Generadores síncronos estáticos – Google Patents
Ground faults at the synchronous machine stator are common and these cause current flows through the neutral conductor. 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.
Lund Institute of Technology. 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.