Stability analysis and oscillation suppression strategy of direct-drive wind power grid-connected system with static var generator

Most of the stability analysis and oscillation suppression strategies of wind power grid-connected system focus on wind farm itself，but less research is implemented for direct-drive wind power grid-connected system with static var generator（SVG）. The control channels that have a significant impact on the stability of grid-connected system are screened out based on eigenvalue sensitivity. The grid-connected system is equivalently split into multiple single-input single-output（SISO） control channels from a multi-input multi-output （MIMO） coupled system based on the individual channel analysis and design（ICAD） theory. The stability of the grid-connected system stability is analyzed qualitatively while the interaction between different control channels is evaluated quantitatively. A sub-synchronous oscillation suppression strategy based on H∞ robust control is proposed to suppress the interaction between control channels. Through electromagnetic transient simulation，the correctness of the grid-connected system stability analysis based on the ICAD theory and the effectiveness of the sub-synchronous oscillation suppression strategy based on H∞ robust control are verified. © 2024 Electric Power Automation Equipment Press. All rights reserved.