Abstract
When wind power is in an AC/DC hybrid power system, it may cause subsynchronous oscillation, especially when the AC power grid of HVDC sending-end is weak, which leads to subsynchronous oscillations of thermal power units in the area. The monitoring results in the past projects show that when subsynchronous oscillation occur in new energy power generation (NEPG), a certain amplitude of subsynchronous frequency current components are injected into the power grid. According to the planning and construction of the National West-to-East Power Transmission Project, a large amount of thermal power will be built in the Yanmenguan-Huinan HVDC sending end area as a support, and the region has abundant NEPG as well. This paper studies the subsynchronous oscillation risk of Yanhuai HVDC and NEPG near the sending end to the thermal power units in the area. The influence of different factors on the risk is analysed. The research results show that the risk of synchronous oscillations is greater when the nearby thermal power units and NEPG have fewer operating units, and the sub-synchronous current generating stations are closer.
Published Version
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