Grid-Connection Control Method for Renewable Energy Transmission

ChangeBridge: Patent Apps - Power Supply (H02J)

Published March 26th, 2026

Detected March 26th, 2026

Summary

The USPTO has published a patent application for a grid-connection control method for renewable energy transmission. The method addresses seasonal transitions by adapting control strategies based on the short-circuit ratio at the connection point, aiming to combine grid-following and grid-forming capabilities.

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What changed

This document details a patent application (US20260088615A1) filed by Kunming University of Science and Technology for a grid-connection control method for renewable energy transmission. The method aims to address challenges during seasonal transitions by dynamically switching between grid-following and grid-forming control strategies based on the short-circuit ratio (SCR) at the renewable energy grid connection point. When SCR exceeds a threshold, a grid-following strategy is invoked; below the threshold, a grid-forming strategy using a virtual synchronous generator (VSG) is employed.

This patent application represents a novel technological development rather than a regulatory change. It does not impose new compliance obligations on regulated entities. However, companies involved in renewable energy transmission and grid integration may find the described control methodologies relevant for future technology development and operational improvements. The application was filed on February 25, 2025, and published on March 26, 2026.

Source document (simplified)

← USPTO Patent Applications

GRID-CONNECTION CONTROL METHOD CONSIDERING SEASONAL TRANSITION FOR THE DUAL-NATURE (FOLLOWING-GRID AND FORMING-GRID) OF RENEWABLE ENERGY TRANSMISSION

Application US20260088615A1 Kind: A1 Mar 26, 2026

Assignee

Kunming University of Science and Technology

Inventors

Hongchun SHU, Zongxue SHAO, Huaibin GAO, Hongfang ZHAO, Guangxue WANG, Yutao TANG, Botao SHI

Abstract

A grid-connection control method considering the duality of grid-following and grid-forming in renewable energy transmission during seasonal transitions includes: obtaining the short-circuit ratio (SCR) at the renewable energy grid connection point; when the SCR is greater than a preset SCR threshold, invoking a grid-following variable coefficient additional frequency control strategy to modulate the PWM inverter for renewable energy grid connection; and when the SCR is less than the preset SCR threshold, invoking a grid-forming variable coefficient virtual synchronous generator (VSG) control strategy to modulate the PWM inverter. The aim is to address the issue of how to combine grid-following and grid-forming control strategies to adapt to changes in grid strength due to seasonal transitions.