Abstract
Aiming at the problem of transient voltage instability in the grid-connected wind power system, a combined method of superconducting fault current limiter (SFCL) and static synchronous compensator (STATCOM) was proposed to suppress voltage saps. In this method, a superconducting fault current limiter (SFCL) is connected in series on the transmission line, and a static synchronous compensator (STATCOM) is connected in parallel on the bus of the wind farm. SFCL shows zero impedance when the system is in normal operation, and quickly shows high impedance when the fault occurs, so as to effectively suppress the short-circuit current and provide the bus voltage support. At the same time, STATCOM provides reactive power during the fault period, so that the system voltage can quickly recover. By establishing the corresponding simulation model, SFCL and STATCOM are used to jointly improve the voltage stability of the wind power grid-connected.
Highlights
Due to the strong intermittence and randomness of wind power, power system integrated with large wind farm is prone to grid problems, one of the most important problems is voltage sag [1]
When the short-circuit fault occurs in the system, the voltage loss caused by the huge short-circuit current will lead to further drop of bus voltage, which will lead to the occurrence of wind turbine tripping [2]
In order to make full use of the advantages of superconducting fault current limiter (SFCL) and STATCOM, this paper proposes a method of combining SFCL and STATCOM to jointly provide voltage support for the bus in case of system failure and jointly improve the voltage stability of the system
Summary
Due to the strong intermittence and randomness of wind power, power system integrated with large wind farm is prone to grid problems, one of the most important problems is voltage sag [1]. When the short-circuit fault occurs in the system, the voltage loss caused by the huge short-circuit current will lead to further drop of bus voltage, which will lead to the occurrence of wind turbine tripping [2]. Aiming at the voltage drop of wind power grid connected system in the fault state, researchers generally improve the voltage stability of the system by changing the control strategy of converter or changing hardware system. Published under licence by IOP Publishing Ltd line voltage loss, lead to serious bus voltage drop, and even damage the power equipment when serious short-circuit fault occurs. In reference [6], considering that wind power grid connection will reduce the moment of inertia of the system, additional virtual inertia control is adopted to improve the voltage stability of the system. In order to make full use of the advantages of SFCL and STATCOM, this paper proposes a method of combining SFCL and STATCOM to jointly provide voltage support for the bus in case of system failure and jointly improve the voltage stability of the system
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