Abstract
This paper proposes a fuzzy logic controller (FLC) based variable resistive bridge type fault current limiter (VR-BFCL) to minimize the impact of faults on voltage source converter high voltage direct current (VSC-HVDC) systems. FLC for VR-BFCL is developed to dynamically insert the appropriate current limiting resistance during contingencies to maintain the fault currents within the acceptable limit. The proposed controller effectively provides variable duties to generate and insert controllable resistance in the system based on fluctuation of direct current (DC) link voltage and point of common coupling (PCC) voltage. The efficacy of the proposed controller is justified through simulations work for balanced and unbalanced faults. The results demonstrate that oscillations in PCC voltage and DC link voltage can be maintained within the acceptable range by controlling fault current through the insertion of the appropriate resistance. It is also found that the proposed controller outperforms the existing method.
Highlights
The generated power in power generating unit is transmitted to the load center through high-voltage direct current (HVDC) conversion due to minimizing power losses, improving security and reliability
Renewable several energy generation units, such as offshore wind farm generator, and solar photovoltaic (PV), integration with HVDC system provides better flexibility compared to conventional high voltage alternating current (HVAC) system due to independent control of active and reactive power[1]
The main purpose of the work is to design non-linear fuzzy logic controller, which dynamically adapts the duty to insert a varying effective resistance in the HVDC system to protect it from high current during disturbances as well as improve dynamic performance
Summary
The generated power in power generating unit is transmitted to the load center through high-voltage direct current (HVDC) conversion due to minimizing power losses, improving security and reliability. Renewable several energy generation units, such as offshore wind farm generator, and solar photovoltaic (PV), integration with HVDC system provides better flexibility compared to conventional high voltage alternating current (HVAC) system due to independent control of active and reactive power[1]. Among the different renewable sources, the variable speed wind generators can be integrated to the electric network through the voltage source converter (VSC) based conversion system [2]. Production and hosting by Elsevier one as it provides more flexibility in controlling power and DC voltage, and improved power quality[3,4,5]
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