A method for optimal control of a converter based on output feedback

By using an output feedback-based optimal control method for converters, control commands are adjusted in real time, solving the problem that traditional converters cannot adapt to changes in the power grid and achieving stable operation and rapid response of the converter under power grid disturbances.

CN122246910APending Publication Date: 2026-06-19ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Filing Date
2026-05-18
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Traditional grid-connected converter control relies on precise mathematical models, which cannot adapt to real-time changes in the power grid. This leads to power and current oscillations under disturbances, affecting the safe grid-connected operation of new energy power generation systems.

Method used

An optimal control method for converters based on output feedback is adopted. By collecting converter output data in real time, the control command is dynamically generated using an optimization algorithm to adapt to changes in grid operating conditions. An output feedback controller is constructed to perform online learning and adaptive parameter adjustment.

Benefits of technology

It enables the converter to respond quickly and control stably under grid disturbances, suppresses power and current oscillations, and improves the operational stability and dynamic tracking performance of the new energy power generation system.

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Abstract

This invention discloses an optimal control method for a converter based on output feedback. The method involves acquiring the active and reactive power outputs of the converter, as well as the control frequency signal; constructing an output feedback controller, using the active and reactive power outputs as inputs, and processing them to obtain d-axis and q-axis current reference values ​​for the inner current loop; inputting these reference values ​​into the inner current loop to generate a modulation wave voltage amplitude signal; and processing the modulation wave voltage amplitude signal and the control frequency signal to generate a drive signal for controlling the converter. This invention can sense and adapt to changes in grid voltage, short-circuit ratio, and other operating conditions in real time. When disturbances such as a decrease in the short-circuit ratio or a frequency drop occur in the grid, it quickly adjusts the control output, actively provides damping, and effectively suppresses power and current oscillations.
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