Input increment optimal control method of converter

By using the optimal input increment control method for the converter and adaptively adjusting the control strategy, the problem of instability of traditional converters under grid disturbances is solved, and stable grid-connected operation and dynamic support capability are improved under grid impact.

CN122246891APending Publication Date: 2026-06-19ZHEJIANG UNIV
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Patent Information

Application Number
CN202610681580.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-18
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Traditional grid-connected converters are prone to instability under grid disturbances, have limited dynamic support capabilities, and lack adaptability in fixed parameter control strategies, leading to risks such as voltage and current oscillations and subsynchronous oscillations.

Method used

The converter adopts an input incremental optimal control method, which calculates active and reactive power by acquiring current and voltage signals, uses a phase-locked loop to acquire frequency signals, constructs an input incremental controller for adaptive adjustment, including offline preparation and online operation stages, uses Hankel matrix and singular value decomposition to determine the system order, uses gradient descent method to optimize controller gain, and generates modulation wave signals for control.

Benefits of technology

When the grid short-circuit ratio decreases and voltage drops, the stability and dynamic support capability of the converter are enhanced, power oscillations are suppressed, the robustness and dynamic response speed of the system are improved, and the operating performance under complex grid conditions is improved.

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Abstract

The invention discloses an input increment optimal control method of a converter. Acquiring the output current and the output voltage of the converter under the dq coordinate system, and further calculating the active power and the reactive power output by the converter; acquiring a control frequency signal through a phase-locked loop, and performing integral operation on the control frequency signal to obtain a phase signal; active power and reactive power output by the converter are used as inputs of an increment controller, and d-axis and q-axis current reference values of a current inner ring are obtained after the inputs are processed by the increment controller; inputting the d-axis current reference value and the q-axis current reference value of the current inner ring into the current inner ring for processing, and generating a modulating wave voltage amplitude signal; and generating a driving signal according to the modulating wave voltage amplitude signal and the phase signal, and controlling the converter. According to the method, an accurate system analysis model does not need to be established in advance, the problem that the control performance is reduced due to inaccurate model parameters or structure mismatch is fundamentally solved, and the dynamic performance of the converter under the complex power grid working condition is effectively improved.
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