Transient state performance improvement control method and system for network construction type energy storage converter

By employing coordinated control of power reference dynamic adjustment, inrush current suppression impedance, and voltage adaptive adjustment, the synchronous instability and overcurrent problems of grid-type energy storage converters during grid faults are solved, achieving stability and current limiting control under fault conditions, and improving transient performance and robustness.

CN121966204APending Publication Date: 2026-05-01SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP
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Patent Information

Application Number
CN202610089002.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-22
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Under conditions of high proportion of new energy grid connection, grid-connected energy storage converters are prone to problems such as synchronous instability, inrush current and steady-state overcurrent when the grid fails. Existing strategies are difficult to coordinate between current limiting and grid-connected behavior, resulting in deterioration of dynamic performance.

Method used

Synchronous stability maintenance and current limiting control are achieved through the synergistic effect of dynamic power reference adjustment, inrush current suppression impedance, and voltage adaptive adjustment. This includes the introduction of active power reference adaptive adjustment, inrush current suppression virtual impedance, and voltage regulation coefficient, which coordinates the control framework of the grid-type energy storage converter.

Benefits of technology

It significantly improves the transient performance and robustness of grid-type energy storage converters during grid fault cycles, ensures synchronization stability and current limiting control, avoids synchronization instability and overcurrent phenomena, and enhances engineering applicability.

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Abstract

The invention relates to the technical field of energy storage converters, and provides a transient performance improvement control method and system for a network construction type energy storage converter, and the method comprises the steps: employing an active reference adjustment coefficient to adjust an active power reference value for active power, calculating the deviation between the active power and the active power reference value, and obtaining a phase angle through an active ring; for reactive power, the deviation between the reactive power and a reactive power reference value is calculated, and internal potential is obtained through a reactive ring; by controlling the on-off of the first switch, the internal potential is used as the input of the impact current suppression ring during normal operation, and the voltage regulation parameter is used as the input of the impact current suppression ring when a power grid has a fault; and the impulse current suppression ring obtains the output of the impulse current ring by controlling the on-off of the second switch and controlling the input or exit of the impulse current suppression impedance, obtains a modulation signal through the voltage ring and the current ring, and generates a driving pulse of each power switch device. And the transient performance, the robustness and the engineering applicability are obviously improved.
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