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Small-Signal Stability Enhancement of Power Grids via Optimally Coordinating Inverter-Based Resources
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  • Hui Yuan ,
  • Zhiyi Li ,
  • Shiyang Li ,
  • Huisheng Gao
Shiyang Li
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Huisheng Gao
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Abstract

The growing penetration of inverter-based resources (IBRs) that synchronize with the power grid through phase-lock loops (PLLs) has caused a set of small-signal stability issues. Commonly, these issues can be addressed by refining controllers’ design of IBRs, which however fails to be effective when power grids are operating under critical conditions. To this end, this paper presents a novel optimization model for coordinating active power outputs (i.e., operation adjustment) of IBRs while satisfying small-signal stability constraints (SSSCs). In particular, SSSCs are formulated based on a new metric that quantifies the small-signal stability from the viewpoint of grid strength, which is especially suitable for those “black-boxed” IBRs. To reduce the problem-solving complexity due to the inherent discontinuity and nonlinearity, a sequential solution approach is proposed to decompose the original optimization problem into a sequence of sub-optimization problems (SOPs). Also, a dynamical-region-adjustment method and a convex-relaxing method are integrated to ensure the existence of feasible solutions and further enhance the solution efficiency. Finally, the performance of the proposed method is verified based on a 11-IBR test power system.