Stabilization control methods for enhancing the stability of wind farm integration via an MMC-based HVDC system

Abstract

The subsynchronous oscillation (SSO) phenomenon may occur in a modular multilevel converter-based high-voltage dc (MMC-HVDC) transmission system for wind farm integration, which has already been observed in the real world. In this paper, the generation mechanism of the SSO phenomenon is revealed by means of the impedance-based analysis. On this base, from the HVDC converter control point of view, stabilization control methods are proposed to enhance the stability of wind farm integration through an MMC-HVDC system. Time domain simulation results validate the theoretical analysis and the proposed stabilization control methods.