Abstract
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.
Highlights
As we all know, though China is a big energy country, the energy resources and the development of productive forces have reverse distribution and serious imbalance
Since 1989 Zhoushan HVDC project had been put into operation officially, China has become the first country in the world of largest DC transmission capacity, the highest voltage level, the fastest growing speed [1]
Subsynchronous oscillation belongs to the power system oscillation instability and it's caused by a special kind of electromechanical coupling effect
Summary
Though China is a big energy country, the energy resources and the development of productive forces have reverse distribution and serious imbalance. Long-distance large-scale electricity transmission becomes inevitable, HVDC technology has vast prospect in China and develops rapidly. Since 1989 Zhoushan HVDC project had been put into operation officially, China has become the first country in the world of largest DC transmission capacity, the highest voltage level, the fastest growing speed [1]. Subsynchronous oscillation belongs to the power system oscillation instability and it's caused by a special kind of electromechanical coupling effect. Subsynchronous oscillation problem caused by HVDC has become an important practical problem [2,3,4,5,6], so study of UHVDC transmission system's SSO question has great significance for power system stability
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