Bifurcation Analysis and Criterion of Voltage Oscillation Induced by Low Voltage Ride Through Control in Renewable Energy Stations

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Abstract
The voltage stability issue of renewable energy stations (RES) cannot be ignored. In this paper, for the Voltage Oscillation Instability phenomenon caused by the Low voltage ride through during High active power output of the RES with No faults (VOILHN), works on both theory and criterion are conducted. In theory, it is explained that the VOI-LHN corresponds to a High active power output and Low voltage ride through control induced Non-smooth Bifurcation (HLINB). Furthermore, based on theoretical derivation and actual power grid parameters, the boundary between HLINB and Saddle Node Bifurcation (SNB) is obtained. The boundary suggests that in actual power grids, wind farms are more prone to HLINB than SNB. In criterion, a criterion for the occurrence of HLINB is developed, and a threshold calculation method for the criterion is proposed.
Funding Information
  • National Nature Science Fund (51477050, 50707035, 51725702)

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