Optimal Operation for Energy Storage With Oscillation Stability Constraints Considering Spatial Differences

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Abstract
Considering the operating mode of power system under weak grid conditions is closely related to the oscillation instability of grid-following (GFL) renewable energy sources (RES), and grid-forming (GFM) energy storage (ES) is one of the effective means to improve GFL stability, this paper further extends the optimal operation objective for ES to ensure small-signal synchronous stability of power system. Firstly, considering the synchronous stability differences of devices at different spatial locations, based on modal decoupling methods, the oscillation stability operating domain dominated by the synchronous loop of multiple GFL RES units (GFLs) is analyzed. Secondly, based on frequency domain analysis and modal decoupling methods, the oscillation stability operating domain of system consisting of multi-point layout GFM ES units(GFMs) and multiple GFLs under different frequency regulation parameters is quantified. Subsequently, considering the frequency regulation reserve and synchronous oscillation stability operating domain constraints, a comprehensive optimal operation model of GFM ES frequency regulation parameters and device output power is proposed. Finally, the effectiveness of the proposed oscillation stability operating domain and optimal operation model is verified in a modified IEEE 39-bus system.
Funding Information
  • National Key Research and Development Program of China (2023YFB2406600)
  • National Natural Science Foundation of China (U22A6007)
  • National Natural Science Foundation of China (52222703)

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