A wind power field subsynchronous oscillation suppression method and system

Abstract

The invention discloses a method and system for suppressing subsynchronous oscillation of a wind farm. The method comprises the following steps: acquiring a three-phase voltage instantaneous value ofa grid connection point of a static synchronous compensator or a three-phase voltage instantaneous value on a series capacitor in an outgoing line of the wind farm, wherein the static synchronous compensator is a static synchronous compensator installed in the wind farm; extracting an oscillation component in the instantaneous value of the three-phase voltage; performing Clark transform on the oscillation component to obtain two voltage signals; According to Clark transformation, two voltage signals, phase-shift angle and gain are obtained to construct two paths of current signals; performingClark inverse transform on the two paths of current signals to obtain three paths of current signals; and adding the three paths of current signals obtained by Clark inverse transformation to the reference current of the current tracking loop of the static synchronous compensator as additional signals. The method and system for suppressing subsynchronous oscillation of the wind farm provided by the invention can effectively suppress the subsynchronous oscillation phenomenon of a wind farm based on a doubly-fed wind generator.

Description

technical field [0001] The invention relates to the technical field of electric power system stability control, in particular to a method and system for suppressing subsynchronous oscillation of a wind farm. Background technique [0002] Stability is the basic requirement for power system operation and the basis for ensuring high-quality power supply. As a clean and renewable energy source, wind power has been vigorously developed by countries all over the world. In actual engineering, it is found that when a large number of wind farms installed with doubly-fed induction generators (DFIG) are connected to the transmission system with fixed series compensation, subsynchronous oscillation (SSO) phenomenon will occur in some cases. The sub-synchronous oscillation will cause the unit to go off-grid, or even damage the power generation equipment, seriously affecting the safe and stable operation of the power system. In 2009, this problem occurred for the first time in a wind fa...

AI Technical Summary

Problems solved by technology

Sub-synchronous oscillation will cause the unit to go off-grid, or even damage the power generation equipment, seriously affecting the safe and stable operation of the power system

In 2009, this problem occurred for the first time in a wind farm in Texas, USA. This SSO accident caused the wind turbine to stop running and damaged the crowbar circuit of some wind turbines.

However, this control scheme is not suitable for DFIGs and cannot provide damping for the subsynchronous oscillations of DFIG wind farms

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