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Self-adaptive system state optimization based on nonlinear affine transformation for renewable energy volatility

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  • Zhang, Zhaoyi
  • Han, Zixi
  • Hu, Hao
  • Fan, Youping
  • Fan, Jianbin
  • Shu, Yinbiao

Abstract

The short-term power variations of renewable energy sources result in system state fluctuations and deviations from the scheduled operating point. Tracking short-term power variations and maintaining the system's optimality is challenging for traditional optimization methods due to their highly time-consuming nature. This paper proposes a short-timescale self-adaptive optimization strategy based on the nonlinear affine transformation to deal with this problem. Firstly, the multi-period optimization model is established and solved by considering static power-frequency characteristics to obtain an optimal operating point on a longer temporal scale, with the state security margins reserved using chance constraint programming. Next, analogously with the Taylor series, the nonlinear relationship between the system state variable and short-term power fluctuations is revealed through an analytic expression of the nonlinear affine transformation. Then, a self-adaptive optimization algorithm based on the nonlinear affine transformation is proposed to achieve frequency and voltage optimizations on a shorter temporal scale. With less communication, self-adaptive optimization is implemented at the local bus level to achieve more optimal states for short-term renewable power variations rapidly. Finally, simulations demonstrate that the proposed optimization strategy can effectively enhance frequency and voltage qualities, and decrease objective function, thereby improving the operation safety and economy.

Suggested Citation

  • Zhang, Zhaoyi & Han, Zixi & Hu, Hao & Fan, Youping & Fan, Jianbin & Shu, Yinbiao, 2024. "Self-adaptive system state optimization based on nonlinear affine transformation for renewable energy volatility," Renewable Energy, Elsevier, vol. 230(C).
    • Handle: RePEc:eee:renene:v:230:y:2024:i:c:s0960148124009145
    DOI: 10.1016/j.renene.2024.120846
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