A method and device for evaluating the access amount of new energy constrained by short-circuit current

By calculating the contribution of new energy sources to the short-circuit current and the maximum amount of new energy connected to the grid, the problem of short-circuit current caused by new energy access in the grid is solved, ensuring grid stability and circuit breaker breaking capacity, and providing evaluation methods and devices.

CN114498648BActive Publication Date: 2026-06-19STATE GRID NINGXIA ELECTRIC POWER CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
STATE GRID NINGXIA ELECTRIC POWER CO
Filing Date
2021-12-31
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

The large-scale integration of new energy sources has led to short-circuit current levels in the power grid approaching or exceeding the rated breaking current of circuit breakers, affecting the safe and stable operation of the power grid. There is a lack of effective methods for assessing the amount of new energy integration.

Method used

By calculating the contribution of new energy sources to the short-circuit current after their integration, and based on the protection of the circuit breaker's breaking capacity, the maximum integration capacity of new energy sources is assessed. A step-by-step aggregation method is adopted to connect to the highest voltage level aggregation station, and an assessment device is provided, including impedance and current calculation modules.

Benefits of technology

Effectively assessing the contribution of new energy sources to short-circuit current when they are connected to the grid can guide the reliable operation of the grid, ensure the breaking capacity of circuit breakers, and improve grid stability.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a method and apparatus for evaluating the amount of renewable energy connected to the grid under short-circuit current constraints. The method includes: calculating the contribution of renewable energy's fixed installed capacity to the short-circuit current after connection to a 750kV substation; then, returning to the actual system, based on the difference between the short-circuit current and the circuit breaker's breaking capacity in the existing system, and ensuring the circuit breaker's breaking capacity, the maximum renewable energy connection amount can be calculated proportionally. This invention can effectively evaluate the contribution of renewable energy to the grid's short-circuit current when connected to the grid and infer the corresponding renewable energy connection capacity, which is of great significance for guiding the reliable operation of the actual power grid.
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