Subsynchronous Oscillation Characteristics for Direct Drive Wind Farm Based on Complex Torque Coefficient Method

Wenchao Zhai; Qi Jia; Gangui Yan

doi:10.17775/CSEEJPES.2021.05760

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Subsynchronous Oscillation Characteristics for Direct Drive Wind Farm Based on Complex Torque Coefficient Method

Regular Papers | 更新时间：2026-02-06

- Subsynchronous Oscillation Characteristics for Direct Drive Wind Farm Based on Complex Torque Coefficient Method
- CSEE Journal of Power and Energy Systems Vol. 11, Issue 4, Pages: 1523-1532(2025)
- 作者机构：
  
  1. School of Electrical Engineering, Northeast Electric Power University,Jilin,China
  2. State Grid Liaoning Electric Power Research Institute,Shenyang,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2021.05760
  CLC：
- Published：2025
- 稿件说明：
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Wenchao Zhai, Qi Jia, Gangui Yan. Subsynchronous Oscillation Characteristics for Direct Drive Wind Farm Based on Complex Torque Coefficient Method[J]. CSEE Journal of Power and Energy Systems, 2025, 11(4): 1523-1532.
DOI：

Wenchao Zhai, Qi Jia, Gangui Yan. Subsynchronous Oscillation Characteristics for Direct Drive Wind Farm Based on Complex Torque Coefficient Method[J]. CSEE Journal of Power and Energy Systems, 2025, 11(4): 1523-1532. DOI： 10.17775/CSEEJPES.2021.05760.

摘要

Abstract

Based on subsynchronous oscillation (SSO) caused by the connection of a direct drive wind farm to a weak alternating current (AC) grid

a complex torque model is proposed. By dividing the wind farm into a direct current capacitor and electrical control part

the analytical expression of damping torque for the electrical control part is deduced and the mechanism of system subsynchronous oscillation is analyzed from the perspective of damping. The system stability is determined based on a damping coefficient less than 0

and the influence laws of grid strength

operating conditions

and control parameters on system damping characteristics are analyzed

based on additional subsynchronous oscillation damping control (SSDC) to suppress SSO. Furthermore

the complex torque model of the parallel access system for multiple sub-wind farms is established

and the dynamic interaction between multiple sub-wind farms is preliminarily explored. The time-domain simulation model is built in EMTDC/PSCAD to verify the correctness of the theoretical analysis.

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