Abstract
Electrical power quality has become an essential part of power systems and electrical machines. True identifying and regarding power quality and how to check the related destructive points are of utmost importance. Most of the time, providing the quality of power for sensitive load which requires the voltage to maintain a sinusoidal waveform at rated voltage and frequency is the main point to be considered. On the other hand, protecting power supply against resulting turbulences can be regarded. Voltage sag is one of the destructive issues in power quality problem to be taken into account. Not only can it have some undesirable effects on the sensitive load, but it also has some undesirable effects on synchronous machine as a power supply. In this study, SFCL was used in order to reduce the destructive effects of voltage sag on the performance of synchronous generators. To achieve better understanding, a simple model composed of synchronous generators, SFCL and load is used with the help of MATLAB/SIMULINK software. By creating voltage sag which results from 3-phase short-circuit voltage, current, torque, speed and angle load changes of synchronous generators were simulated and discussed. It was done in condition with/without SFCL. The results illustrate that using SFCL in synchronous generator output can improve its performance during occurrence of voltage sag.
Highlights
The importance of paying attention to power quality issue is increasing day by day
The function of fault current limiter (FCL) in electric power systems is both limiting the range of short circuit currents and increasing the stability level of power system
SFCLs which have characteristics of superconductors can change the level of resistance from near zero to high level in normal state [12]
Summary
The importance of paying attention to power quality issue is increasing day by day. Power quality is usually meant to say the quality of voltage and/or the quality of current and can be defined as: the measure, analysis, and enhancement of the bus voltage to keep a sinusoidal waveform at rated voltage and frequency [1]. More need for electric power results while increasing the level of short-circuit current which makes electric equipment fail and it is because of the resulting mechanic and electric pressure. The function of FCL in electric power systems is both limiting the range of short circuit currents and increasing the stability level of power system. SFCL produces impedance and it is because of the loss of superconductor It puts this impedance on the circuit which limits fault current. SFCLs which have characteristics of superconductors can change the level of resistance from near zero (superconductor state) to high level in normal state (non-superconductor state) [12] It is the case when current, temperature or field outreach critical amount. SFCL was used in order to reduce the destructive effects of voltage sag on the performance of synchronous generators
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