An enhanced grid-forming control system suitable for energy storage converters

By using virtual synchronous generator control and a voltage inner loop structure consisting of a cross-PI link and a direct-pass high-pass filter, the voltage support problem of the energy storage converter when the grid voltage changes rapidly is solved, achieving fast response and voltage stability, and improving the stability of the grid.

CN122159237APending Publication Date: 2026-06-05HARBIN INSTITUTE OF TECHNOLOGY (SHENZHEN) (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INSTITUTE OF TECHNOLOGY (SHENZHEN) (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)
Filing Date
2026-02-10
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

When the grid voltage changes rapidly, the existing energy storage converter cannot respond quickly due to the traditional voltage and current dual closed-loop control, which results in the inability to provide effective voltage support. This may cause new energy equipment to disconnect from the grid and cause large-scale grid paralysis.

Method used

A virtual synchronous generator control module is used to guide the energy storage converter in generating internal potential phase and terminal voltage amplitude. Combined with the voltage inner loop structure of cross-PI link and direct-pass high-pass filter, the voltage support capability is enhanced. The SVPWM modulation signal is generated through the current loop to achieve fast response.

Benefits of technology

When the grid voltage changes rapidly, it can respond quickly within the voltage loop control timescale, provide effective voltage support, suppress voltage fluctuations, ensure grid stability, and improve the system's voltage support capability.

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Abstract

The application provides an enhanced network control system suitable for an energy storage converter, which comprises: a virtual synchronous generator (VSG) control module for guiding the energy storage converter to generate an internal electromotive force phase and an end voltage amplitude; the virtual synchronous generator control module comprises a frequency-active power control module and a reactive droop control module; a voltage loop receives a voltage amplitude signal generated by the reactive droop control module, generates a filtered inductance current instruction signal through a cross-PI link and a through link; a current loop receives a current instruction provided by the voltage loop, generates a modulation signal of SVPWM through a PI link; and the through link of the voltage loop is set as an inverse of the current loop controller. The application can maintain the voltage source characteristics of the energy storage converter system in the voltage loop control time scale when the grid voltage changes rapidly, and provide effective reactive power / voltage support for the grid.
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