Active three-phase reclosing system and method for 110kV single-loop outgoing line of wind power plant

Abstract

The invention discloses an active three-phase reclosing system and method for a 110kV single-loop outgoing line of a wind power plant. The method comprises: after line fault tripping, closing a STATCOM grid-connected circuit breaker and a circuit breaker on the side, close to the wind power plant, of the line, and controlling switching of a STATCOM full-bridge sub-module capacitor according to a preset additional control strategy to inject a pre-selected characteristic signal into the fault line, wherein the characteristic signal is the maximum current amplitude selected according to the duration of signal injection and the endurance capability of the power electronic device, and the duration time is obtained by setting a three-phase fault of a near-end outlet of the outgoing line; and realizing fault property discrimination of the fault line according to the predetermined propagation characteristic difference of the characteristic signals in different fault types, not reclosing the power transmission line when it is judged that the fault continuously exists, and reclosing the converter when it is judged that the fault disappears. Self-adaptive reclosing is achieved through the wind power line 110kV overhead line grid-connected system, safe and reliable operation of the system is ensured, power failure losses are reduced, and direct benefits and indirect benefits are quite remarkable.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to an active detection type three-phase reclosing method for a 110kV single-loop outgoing line of a wind farm containing STATCOM. Background technique [0002] With the rapid improvement of the manufacturing level of wind turbines, the installed capacity of wind turbines in the grid continues to increase, the voltage level of wind power centralized access to the grid is getting higher and higher, and the transmission distance is getting farther and farther. my country's wind power access to 110kV and above voltage level The installed capacity accounts for about 75% of the total wind power access. After wind farms are connected to the grid, there are problems such as system reactive power compensation and voltage stability. Centralized reactive power compensation is often performed at the grid connection point. Reactive power equipment based on Flexible AC Tr...

AI Technical Summary

Problems solved by technology

With the increase of the output power of wind power, the withdrawal of the wind farm after the output line trips will cause a large power shortage in the system, which is not conducive to system stability. The instantaneous fault of the 110kV output line should be reclosed as soon as possible

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