Subsynchronous Oscillation Problem Research in the UHVDC System of a Regional Power Grid in China

摘要

Along with the grid structure being more and more complex and the rapid development of the HVDC system, studying the subsynchronous oscillation (SSO) problem on HVDC system has more engineering practice significance. The paper studies subsynchronous oscillations problem of generators near the ±800kV UHVDC converter station, and analyzes the subsynchronous oscillation possibilities through PSCAD/EMTDC simulation. At last, though the researched UHVDC thermal plants have none SSO risk but it needs other measures to make the relevant generators return on normal operation.Key words: UHVDC / subsynchronous oscillation (SSO) / PSCAD/EMTDC simulation