FAULT RESPONSE OF AN HVDC LINK BASED ON VOLTAGE SOURCED CONVERTERS USING ADAPTIVE FUZZY CONTROL SYSTEM

摘要

In this paper is studied a High Voltage Direct Current (HVDC) link based on Voltage Sourced Converters (VSCs), which feeds a weak ac network with power produced from an offshore Wind Farm (WF) of induction generators. Its fast, adaptive control system, which is based on fuzzy logic, manages to offer a very satisfactory performance even in transient conditions, such as wind speed variations and faults. The paper focuses on the response of the system when faults take place at the Point of Common Coupling (PCC). The simulation results show that the control system quickly detects the fault and with fast reactive power control combined with appropriate active power exchange, manages to minimize the disturbances in the system operation by avoiding the tripping of the WFs and limiting the current and voltage variations inside their acceptable zones.