Method for suppressing subsynchronous oscillation of wind power series compensation system

Abstract

A method for suppressing subsynchronous oscillation of a wind power series compensation system includes the following steps: Step 1: timely detecting the frequency and voltage condition of a wind power series compensation system to determine whether subsynchronous oscillation occurs in the wind power series compensation system; Step 2: determining the variation of subsynchronous oscillation according to the oscillation of the wind power series compensation system; Step 3: if subsynchronous oscillation shows a gradually deepening state, enabling additional damping control to improve subsynchronous oscillation of the wind power series compensation system, so as to achieve the suppression of the subsynchronous oscillation of the wind power series compensation system; and Step 4: If the subsynchronous oscillation shows a gradually declining state, enabling fuzzy adaptive control to improve subsynchronous oscillation of the wind power series compensation system to achieve the suppression of the subsynchronous oscillation of the wind power series compensation system. The method can realize subsynchronous oscillation suppression of the wind power series compensation system more flexibly according to the actual working conditions of the power system.

Description

technical field [0001] The invention relates to a method for suppressing subsynchronous oscillation of a wind power series compensation system. Background technique [0002] In recent years, the shortage of conventional energy and the pressure of environmental protection have led to the large-scale application of clean energy such as wind power and solar energy at home and abroad. Our country is very rich in wind power resources, and the development of large-scale wind power has become an important energy source in our country. strategy. However, the problem of uneven distribution of energy and load centers in my country is very serious, and it is urgent to use large-scale long-distance power transmission to transmit electric energy from energy centers to load centers. The series compensation technology can significantly improve the energy transmission capacity, and has broad application prospects in long-distance wind power transmission. However, series compensation chang...

AI Technical Summary

Problems solved by technology

However, series compensation changes the impedance characteristics of the line, and there is a risk of subsynchronous oscillations in energy delivery

In October 2009, a subsynchronous oscillation caused by series compensation occurred in a wind farm in Texas, USA, causing a large number of trips of wind turbines and damage to internal crowbar circuits

The patent 201610294512.2 "Subsynchronous Oscillation Suppression Method for Doubly-fed Wind Turbine Based on Stator Reactive Power Classification Control" applied by Wu Xi et al. uses the stator reactive power classification control method to improve the subsynchronous oscillation phenomenon, and the suppression effect is limited by the reactive power adjustment range of wind turbines

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