Method and device for suppressing subsynchronous oscillation of double-fed wind power plant

Abstract

The invention provides a method and a device for suppressing subsynchronous oscillation of a double-fed wind power plant. The method comprises the following steps of acquiring a voltage signal and a current signal of an output end of the double-fed wind power plant; analyzing the voltage signal and the current signal, determining voltage amplitude, current amplitude and a subsynchronous oscillation frequency of the subsynchronous oscillation of the double-fed wind power plant; determining parameters of a damping controller according to the voltage amplitude, the current amplitude and the subsynchronous oscillation frequency of the subsynchronous oscillation and a damping controller parameter table, wherein the damping controller parameter table is a pre-established table for a corresponding relation between the oscillation frequency and the damping controller parameters; and connecting the damping controller with the determined control parameters to a reactive control link of a wind turbine generator of the double-fed wind power plant in series in order to suppress the subsynchronous oscillation of the double-fed wind power plant. According to the method and the device, the subsynchronous oscillation of the double-fed wind power plant is suppressed based on the parameter self-adjustable series type additional damping controller, and the subsynchronous oscillation of the wind power plant can be simply and quickly suppressed, so that a system can run stably.

Description

technical field [0001] The invention relates to electric power technology, in particular to a double-fed wind power field synchronous oscillation suppression method and device. Background technique [0002] The rapid development of wind power technology has made wind power play an increasingly important role in the power grid. Many large wind farms have been built and put into operation one after another. However, there is a big difference between wind resources and power loads in my country. Rich remote areas are far away from the load center, so they need to be sent to the load center through long-distance transmission. Series compensation technology can increase the capacity of long-distance power transmission and improve system stability, so it is widely used in large-scale wind power transmission systems. [0003] The existing series compensation technology is to insert a capacitor bank in series in the transmission line, and use the capacitive reactance of the capacito...

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Problems solved by technology

However, the methods in the prior art require additional damping controllers, and some wind farms have been built for many years, and new and old wind turbines coexist. There may be many problems in introducing suppression measures to wind turbines that h

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