Doubly-fed wind farm sub-synchronous oscillation SVG suppressing method and device

Abstract

The present invention provides a doubly-fed wind farm sub-synchronous oscillation SVG suppressing method and a device. The method comprises the following steps: acquiring voltage signal(s), current signal(s) and wind farm parameters of the output end(s) of a doubly-fed wind farm, wherein the wind farm parameters comprises a wind speed and a power-transmission line series compensation degree; determining active power signal(s), voltage oscillation amplitude(s) and current oscillation amplitude(s) according to the voltage signal(s) and the current signal(s); determining the working mode of a SVGcontroller; determining module parameter(s) of the SVG controller according to the determined working mode, the voltage oscillation amplitude(s), the current oscillation amplitude(s), oscillation frequencies, the wind farm parameters and a pre-established SVG parameter table, wherein the SVG parameter table is a pre-established corresponding table of the SVG function module parameter(s) and system operation information under different working modes; and performing sub-synchronous oscillation SVG suppressing on the wind farm by using the SVG controller with the determined parameter(s). According to the method, sub-synchronous frequency band signal(s) are filtered from sampling signal(s), and the doubly-fed wind farm is subjected to sub-synchronous oscillation SVG suppressing by using the voltage(s) and the active power(s).

Description

technical field [0001] The invention relates to electric power technology, in particular to a SVG suppression method and device for double-fed wind power field subsynchronous oscillation. Background technique [0002] As a clean energy source, wind power has been highly valued by countries all over the world, especially today when fossil energy is increasingly exhausted. The large-scale development and utilization of wind power has also become an important part of my country's energy strategy. my country's wind power technology started relatively late, but it has developed rapidly. The installed capacity of wind power has increased year by year, and the proportion of wind power in power supply has also increased rapidly. However, the areas rich in wind resources in my country are mainly concentrated in the three north regions, far away from the load center, and high-voltage long-distance power transmission has become an inevitable choice. Since the series capacitor compensa...

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Problems solved by technology

[0005] In the traditional method of applying SVG to suppress subsynchronous resonance in power system, the speed signal of generator set is mostly used as the input signal of SVG damping controller. The most direct criterion for the occurrence of synchronous resonance, but it is difficult to extract the torque based on the torque of the DFIG wind farm

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