A system optimization scheduling method and system based on frequency stability constraints

CN118611169BActive Publication Date: 2026-07-24CHINA ELECTRIC POWER RESEARCH INSTITUTE CO LTD +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA ELECTRIC POWER RESEARCH INSTITUTE CO LTD
Filing Date
2024-05-20
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The frequency stability problem of high-proportion renewable energy power systems is difficult to solve effectively. Existing dispatching methods are computationally intensive, burdensome, or have poor interpretability, and renewable energy reserve retention costs are high. There is a lack of efficient and accurate optimization dispatching methods.

Method used

By aggregating synchronous generator units and new energy generator units into equivalent values, an equivalent frequency response model of the system is established. The frequency response process under the limiting condition is solved piecewise to obtain the equations relating the minimum frequency point to the reserve, and the generator unit's power generation plan and power generation cost are determined.

Benefits of technology

It improves transient frequency stability in scenarios with limited backup, reduces the cost of renewable energy backup, optimizes power generation plans, and ensures system frequency stability.

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Abstract

The application provides a system optimization scheduling method and system based on frequency stability constraints, comprising: aggregating and equivalencing synchronous units and new energy units in a system to obtain a system equivalent frequency response model containing new energy units; solving the system equivalent frequency response model of each stage of the system under amplitude limiting through time sequence segmentation to obtain a dynamic response process of system frequency at each stage under amplitude limiting; obtaining an equation set of frequency minimum points and reserve relationships according to the dynamic response process; solving the equation set to obtain a constraint of transient frequency stability on reserve unit allocation under reserve limitation; and determining unit generation plans and generation costs based on the constraint of reserve unit allocation and conventional constraints of the system. The system transient frequency stability after a given fault occurs is improved.
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