Power distribution network and micro-grid coordinated optimization method and device with embedded frequency security constraints

By establishing a coordinated optimization method of embedded frequency safety constraints in the distribution network and the microgrid, the problem of traditional power scheduling models ignoring the frequency modulation potential of microgrid energy storage systems is solved, and more efficient frequency response and economic operation are achieved.

CN119726807AActive Publication Date: 2025-03-28TIANJIN UNIV
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Patent Information

Application Number
CN202510085123.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-20
Publication Date
2025-03-28
Estimated Expiration
2045-01-20

AI Technical Summary

Technical Problem

When facing the frequency stability challenges brought about by the growth of wind power and photovoltaic installed capacity, the traditional power scheduling model ignores the frequency modulation potential of the microgrid energy storage system, resulting in insufficient frequency response capability of the power grid and the frequency modulation pressure is concentrated on the transmission side.

Method used

By establishing a coordinated optimization method of distribution grid and microgrid with embedded frequency safety constraints, models of distribution grid and microgrid are constructed separately, using second-order cone planning and random-conditional risk value methods to evaluate uncertainty costs, and determining the backup capacity and price provided by the microgrid through cooperative game system models, and using ADMM algorithm to achieve distributed solutions.

Benefits of technology

Optimize the backup demand of the distribution network, improve frequency safety, reduce dependence on the frequency modulation resources of the transmission grid, and achieve more economical grid operation.

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Abstract

The invention discloses a power distribution network and micro-grid coordinated optimization method with an embedded frequency security constraint, and the method comprises the steps: taking a power distribution network and a micro-grid as independent subjects, building a power distribution network model and a micro-grid model respectively, and building the power distribution network model based on a second-order cone programming model of the embedded frequency security constraint; the micro-grid model is constructed based on inertia and frequency modulation constraint conditions and by taking the lowest scheduling cost as a target, and the uncertainty cost is evaluated by adopting a random-conditional value-at-risk method; a cooperative game system model of the power distribution network and the micro-grids is established, the reserve capacity and the corresponding price provided by each micro-grid are determined through a cooperative bargaining mode, and the cooperative game system model is further converted into two sub-problems of cost minimization and benefit distribution in the cooperative game system. And realizing distributed solution of the model through an ADMM algorithm to obtain an optimal bargaining strategy. Through cooperative optimization of the power distribution network and the micro-grid, the frequency modulation effect of energy storage of the micro-grid is exerted, and more economical operation is realized.
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