Double-fed wind power plant sub-synchronous oscillation SVC suppression method and device

Abstract

The invention provides a double-fed wind power plant sub-synchronous oscillation SVC suppression method and device. The method comprises the following steps: acquiring a voltage signal, a current signal and wind power plant parameters of the double-fed wind power plant output end, wherein the wind power plant parameters comprise wind speed and power transmission line series compensation; ;determining an active power signal, a voltage oscillation amplitude and a current oscillation amplitude according to the voltage signal and the current signal; determining a work mode of a SVC controller; determining module parameters of the SVC controller according to the determined work mode, the voltage oscillation amplitude, the current oscillation amplitude, the oscillation frequency, the wind powerfield parameter and a pre-established SVC parameter table, wherein the SVC parameter table is the pre-established SVC function module parameter and system operation information corresponding table under different work modes; and performing sub-synchronous oscillation SVC suppression on the wind power field by using the SVC controller with determined parameter. The sub-synchronous band signal is filtered from a sampling signal, and the sub-synchronous oscillation SVC suppression is performed on the double-fed wind power plant by using the voltage and the active power.

Description

technical field [0001] The invention relates to electric power technology, in particular to a double-fed wind power field synchronous oscillation SVC suppression method and device. 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 compensation ca...

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Problems solved by technology

[0005] In the traditional method of using SVC to suppress the subsynchronous resonance of the power system, the speed signal of the generator set is mostly used as the input signal of the SVC damping controller. For large generator sets, the active power of the large generator set is also used as the input signal of the SVC controller. , but for the subsynchronous resonance of the grid-connected system of large-scale double-fed wind farms, since the wind turbines are scattered and have different operating states, it is difficult to select the speed signal, and it is also difficult to reflect the operating status of each wind turbine

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