Method for evaluating new energy access capacity limit considering node frequency safety constraint

CN122394068APending Publication Date: 2026-07-14SOUTHEAST UNIV

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: SOUTHEAST UNIV
Filing Date: 2026-04-17
Publication Date: 2026-07-14

AI Technical Summary

Technical Problem

Existing technologies are unable to accurately assess the dynamic differences in frequency between different power system nodes, causing the assessment results of new energy access capacity to deviate from the true frequency safety boundary. Furthermore, existing methods have high computational complexity and are difficult to embed into capacity optimization models.

Method used

By constructing a spatiotemporal network model of the power system frequency, the load disturbance is mapped to the supporting power node using the node susceptance matrix and disturbance allocation matrix. The initial frequency change rate is analyzed by combining the equivalent inertia parameter, and the frequency change rate and minimum point constraint are linearized to construct a capacity optimization model to solve the limit of new energy access.

Benefits of technology

It accurately identifies weak nodes in the power grid's frequency support capability, reduces computational complexity, provides a systematic frequency security assessment, adapts to different disturbance scenarios, and the assessment results closely approximate the actual frequency security boundary.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN122394068A_ABST

Patent Text Reader

Abstract

The application discloses a new energy access capacity limit evaluation method considering node frequency safety constraints and belongs to the technical field of power system frequency safety evaluation; the evaluation method comprises the following steps: a power system frequency space-time network model is established based on a node admittance matrix, a disturbance distribution matrix and a frequency mapping matrix are extracted and analyzed; an analytical expression of initial frequency change rate of all nodes and a frequency minimum point is derived; on the basis, a capacity optimization model with new energy access power maximization as an objective and with all-node frequency safety indexes as cores is constructed, and a piecewise linearization based on inertia reciprocal and a curved surface linearization technology based on a conservative lower bound are respectively adopted to process nonlinear constraints; the new energy access capacity limit is determined by solving a robust optimization model and corresponding results of the most unfavorable disturbance. The application can accurately reflect frequency space-time distribution characteristics and has high calculation efficiency, and provides a scientific basis for large-scale power grid new energy access planning.

Need to check novelty before this filing date? Find Prior Art