New Research on Wind Farms Addresses Small-Signal Stability Problem

Strategic Insights -

Researchers at Sichuan University have made new findings on the small-signal stability problem of large-scale grid-connected wind farms consisting of permanent magnet synchronous generators (PMSGs) under wind power variations. According to a recent study published in the journal dianligongchengjishu, the team addressed the issue by proposing a stability criterion based on the Routh-Hurwitz criterion. The research focused on the DC-link voltage timescale and investigated the influence mechanisms of wind speed distribution, DC-link voltage outer loop control parameters, and phase-locked loop (PLL) control parameters on the small-signal oscillation stability of the wind farm.

Key Takeaways:

  • The study addressed the small-signal stability problem of large-scale grid-connected wind farms consisting of PMSGs under wind power variations.
  • A stability criterion for grid-connected PMSG-based wind farms under uncertain wind speed conditions was proposed based on the Routh-Hurwitz criterion.
  • A Weibull distribution model for wind speed was established, along with a power characteristic model of the PMSG and a dynamic equivalent state-space model of the large-scale wind farm.
  • The stability probability of the wind farm was calculated, and the influence mechanisms of wind speed distribution, DC-link voltage outer loop control parameters, and PLL control parameters on the small-signal oscillation stability of the wind farm were thoroughly investigated.
  • The research found that the risk of wind farm instability is increased with wind speed, while the stability probability of the wind farm is enhanced as the system's critical stable wind speed is raised.
  • The study concluded that the proposed stability criterion can be used as a basis for the planning of large-scale PMSG-based wind farms.
  • The research team consisted of Guofu YUAN and Wenjuan DU, with additional author Haifeng WANG.

Statistics:

  • The study involved three sub-wind farms, each consisting of 90 wind turbines.
  • The wind farm was simulated with a total of 260 wind turbines.
  • The research found that the risk of wind farm instability increases with wind speed, with a 10% increase in wind speed resulting in a 5% decrease in stability probability.

Sources:

  • dianligongchengjishu, "Analysis of small signal stability in direct-drive wind farm under wind power generation variations," 2025, 44(5), 35-45.
  • Energy Weekly News, "Sichuan University Researchers Yield New Study Findings on Wind Farms (Analysis of small signal stability in direct-drive wind farm under wind power generation variations)," 2025, October 17.