Security Optimization Method for Unit Commitment in New Power Systems Considering Load Equivalent Inertia

SONG Jiawen; WANG Qi; WANG Yalun; XIA Yuxiang; TANG Yi

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Electric Power Construction ›› 2025

Security Optimization Method for Unit Commitment in New Power Systems Considering Load Equivalent Inertia

SONG Jiawen¹, WANG Qi¹, WANG Yalun¹, XIA Yuxiang², TANG Yi¹

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Abstract

[Objective] With the advancement of the construction of new power systems, renewable energy units are gradually replacing traditional thermal power units. The inertia level on the generation side continues to decline, and the frequency inertia support on the load side becomes increasingly important. Therefore, it is necessary to further incorporate coordinated inertia optimization between generation and load sides into conventional unit commitment processes. [Method] In this paper, the equivalent inertia support capacity of the load side is theoretically analyzed, and a calculation method for system inertia considering load inertia response strategies is proposed. Building on this foundation, a method for assessing minimum inertia based on the initial rate of frequency change and the frequency nadir is proposed. An optimal unit commitment safety model is established based on the proposed load response strategy and the minimum inertia assessment results. [Result] Case studies demonstrate that the proposed method can satisfy system frequency security constraints while reducing reliance on conventional unit inertia and optimizing the allocation of inertia resources between generation and load sides. Consequently, the overall operational economy of the system is significantly improved without compromising grid security. [Conclusion] It is concluded that controllable resources on the load side can provide flexible equivalent inertia support through their rapid response capabilities, effectively mitigating frequency decline issues and reducing system operating costs.

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system frequency response / unit commitment optimization / frequency security / load equivalent inertia

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SONG Jiawen, WANG Qi, WANG Yalun, XIA Yuxiang, TANG Yi. Security Optimization Method for Unit Commitment in New Power Systems Considering Load Equivalent Inertia[J]. Electric Power Construction. 2025

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