Harmonic adaptive compensation control method and system for grid connection point of wind power converter

By implementing a harmonic adaptive compensation control method for the grid connection point of the wind power converter, the problem of unstable harmonic compensation effect under fixed parameter design is solved, dynamic adaptation to changes in grid impedance is achieved, and the harmonic suppression effect and stability of the wind power grid connection system are improved.

CN122159253APending Publication Date: 2026-06-05HUANENG HUILI WIND POWER GENERATION CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUANENG HUILI WIND POWER GENERATION CO LTD
Filing Date
2026-01-29
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

The existing harmonic compensation controllers at the grid connection point of wind power converters are designed with fixed parameters, which makes it difficult to adapt to the dynamic changes in grid impedance. This leads to unstable harmonic compensation effects and may even cause system resonance, affecting the stability and reliability of the wind power grid connection system.

Method used

By performing coordinate transformation on the grid connection point voltage and current signals, the target harmonic components are extracted, and zero-intrusion grid harmonic impedance is identified online. The harmonic compensation gain is adaptively calculated, harmonic compensation commands are generated, and the converter output voltage is adjusted to dynamically adjust the harmonic controller parameters.

Benefits of technology

It achieves effective harmonic suppression of wind power converters under complex and variable grid impedance, improves robustness and stability, and ensures stable operation of power quality under various operating conditions.

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Abstract

The present application relates to the field of wind power converter compensation control, and provides a wind power converter grid-connected point harmonic adaptive compensation control method and system, which realizes zero-intrusion online identification of grid harmonic impedance by coordinate transformation and target harmonic component extraction on grid-connected point voltage and current signals; based on this, the identified grid harmonic impedance estimation value is used to adaptively calculate the proportional and integral gains of harmonic compensation in combination with the preset system target dynamic performance; finally, the adaptive gains are used to generate and superimpose harmonic compensation instructions to adjust the output voltage of the converter. In this way, the wind power converter can dynamically adjust its parameters when facing complex and variable grid impedance, thereby effectively avoiding the problem of compensation effect deterioration or even resonance caused by grid impedance changes, greatly improving the robustness and stability of harmonic suppression, and ensuring the power quality of the wind power grid-connected system under various operating conditions.
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