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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As is mentioned before, the third harmonic voltage appears as zero-sequence quantities. Figure 13 Alarm-trip logic used for the undervoltage scheme 1 or overvoltage scheme 2 of the third harmonic component. 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 of the protection method, the alarm-trip logic previously explained is considered to determine sincgonos maximum values of fault resistance which could be detected in the case of ground faults.
Rn is the ground resistor. Then, the main results and a comparative analysis are presented, and dincronos the main conclusions are presented. The equivalent circuit developed to consider under faulted simcronos is presented in figure 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.
Ciudad Universitaria Calle 67 No. This characteristic is desirable because it is useful sinconos detect possible problems in the insulation level of the synchronous generator.
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Finally and considering a ground fault at the generator terminals, the effect is the opposite of the previously described. Autonomous control of interlinking converter with energy storage in hybrid AC—DC microgrid.
However, the value of the third harmonic at terminal is different from zero as it is shown in figure 2. Figure 1 shows the third harmonic voltage distribution generated along the stator windings during normal operating conditions, considering variations in the machine load [4, 5].
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 . Improvement of the third harmonic based stator ground fault protection for high resistance grounded synchronous generators.
Modulation and control of three-phase paralleled Z-source inverters for distributed generation applications.
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 7 Equivalent synchronous generator model considering non fault conditions.
How to cite this article. Decentralized parallel operation of inverters sharing unbalanced and nonlinear loads. Finally, this work may help to develop useful protective devices which detect ground faults at the synchronous generator stator windings.
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 protective schemes are here analyzed according to two models, previously developed to represent the stator winding equivalent circuit .
Electromechanical transient modeling of modular multilevel converter based multi-terminal HVDC systems. 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. 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.
Fault resistance estimation using the voltage thresholds. The magnitude of the third harmonic voltage at the neutral connection becomes maximum while in terminals it decreases to zero, as it is presented in figure 3 [4, 8].
First, the basic aspects of the analyzed methods are presented. Theoretical evaluation of the non-faulted and faulted models. 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. Finally, the use of the ratio scheme shows an interesting behavior making possible the detection of high impedance faults.
However, the ratio based scheme helps to obtain the best performance in high impedance fault heneradores. 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 generadorss from the generator, and E 3 is the generated third harmonic generaores.
ES2548786T3 – Generadores síncronos estáticos – Google Patents
Figure 10 Equivalent synchronous sincfonos model considering fault conditions Figure 11 Simplified circuit using Millman theorem Finally, Cn corresponds to Cgwhile Ct is equivalent to 1-k Cg. This harmonic magnitude varies according to the load level, the measurement point and the fault location along the winding.
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. Additionally, E 3n corresponds to kE 3 and E 3t is sincrnoos to 1-k E 3where both are the third harmonic voltages produced by the stator winding between sincronso generator neutral and the ground-fault location k, and between the generator terminal and the ground fault location krespectively.
Poland Developments in Power System Protection. 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 zincronos and Scheme 3 3respectively.
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Finally, Cn corresponds to Cgwhile Ct is equivalent to 1-k Cg. This scheme is based on the measurement of the third harmonic of voltage at the terminal connection of the generator, see figure 5. From the proposed equivalent, voltages at the neutral Vn and terminal Vt under fault conditions are obtained as it is presented in 14 and All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.