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The anti-islanding performance of the frequency protection is strongly affected by the power imbalance between the islanded loads and distributed generators. However, different scenarios of load profiles can create similar power imbalance levels inside the island, leading to different protection's detection time due to the difference on the load dynamic behavior. In this context, this paper investigates...
Direct current transmission based on Voltage Source Converters (VSC-HVDC) has a number of advantages compared with traditional HVDC systems. However, VSC-HVDC systems are subjected to high short circuit currents due to faults in the DC line, which may contribute negatively to the dissemination and advances of this technology. In this context, this paper analyzes the impact of superconducting fault...
The performance of passive islanding detection techniques, such as frequency-based and voltage-based relays are affected by the active and reactive power imbalance and by the voltage dependence of the system loads. The combination of the load variation at different nodes of the power distribution grid with the DG power output can create similar power imbalance scenarios but with different voltage...
This study proposes simulation and analytical models of frequency-based protection functions (under and over frequency, rate of change of frequency and vector surge) used to detect islanding of synchronous distributed generators. All relay models are validated by using the concept of performance curves and two commercial relays. By using the performance curves, it is possible to make a comparison...
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