Subsynchronous Oscillation Research of LCC-HVDC Receiving End System with Large-scale Renewable Power Generation

The line-commutated-converter (LCC) based high voltage direct current (HVDC), and renewable power generation have developed rapidly in central China. However, the risk of subsynchronous oscillation (SSO) for this typical LCC-HVDC receiving end system with large-scale renewable power generations (LCCre-RPGs) is unclear. In this paper, a small-signal model of LCCre-RPGs is constructed. The renewable power generations are simulated by a permanent magnet synchronous generator (PMSG) and a doubly-fed induction generator (DFIG). Then, the interaction between LCC-HVDC and renewable power generations is analyzed through the eigenvalue analysis and participation factor analysis. Moreover, the interaction may lead to the risk of SSO. Finally, the influence of controller parameters on the SSO modes is investigated in detail, which provides theoretical support for optimizing relevant parameters. The time-domain simulation of the original nonlinear model verifies the above analysis results.