Power Generation Technology ›› 2018, Vol. 39 ›› Issue (3): 195-203.DOI: 10.12096/j.2096-4528.pgt.2018.030

• Energy Internet •     Next Articles

A Review of Investigations on Sub-synchronous Oscillations in Power Systems Caused by DFIG Wind Farms Based on the Complex Torque Coefficients Method

Yijun WANG(),Wenjuan DU*(),Chen CHEN,Haifeng WANG   

  • Received:2018-04-13 Published:2018-06-30 Online:2018-07-27
  • Contact: Wenjuan DU
  • Supported by:
    the National Key Research and Development Program of China(2016YFB0900602);State Grid Corporation of China Research Program(52094017000W)

Abstract:

The wind power is a kind of clean and sustainable energy which has been developed rapidly in China in recent years. Doubly-fed induction generator (DFIG) have been widely applied for wind power generations for its flexible controllability. However, due to the special structure of the DFIG, grid-connected DFIG wind farms may cause sub-synchronous oscillation(SSO) in power systems. This paper introduces the mechanism of SSO caused by grid-connected DFIG wind farms. Moreover, a systematic review of researches on the three types of SSOs based on the complex torque coefficient method is presented in the paper. In addition, the extension form and application area the complex torque coefficient method is explored. Furthermore, based on the development trend of wind power generations and the characteristics of the complex torque coefficient method, the research prospects are discussed.

Key words: grid-connected doubly-fed induction generator (DFIG) wind farms, sub-synchronous oscillation (SSO), complex torque coefficient method, sub-synchronous resonance(SSR), sub-synchronous torsional interaction (SSTI), sub-synchronous control interaction (SSCI)