Active elimination method of dc pulsation of wind power cluster sending-out system rectified by diode dispersion

By dynamically adjusting the phase of the AC voltage on the grid side of the wind turbine through the central controller and actively eliminating DC pulsation in the DC transmission system of the offshore wind power cluster using the negative gradient algorithm, the problem of DC current pulsation caused by inconsistent wind turbine output is solved, and low-cost, lightweight system operation is achieved.

CN122118891APending Publication Date: 2026-05-29TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Filing Date
2026-03-27
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies cannot effectively suppress DC current pulsations caused by diode rectifiers in offshore wind power cluster DC transmission systems. Especially under conditions of inconsistent wind turbine output, the vector cancellation capability of traditional fixed interleaved control is limited, leading to increased equipment size and cost.

Method used

A negative gradient algorithm based on a central controller is adopted to dynamically adjust the reference phase of the AC voltage on the grid side of the wind turbine. The closed cancellation of unequal amplitude harmonic vectors is achieved through low-bandwidth communication. The active phase control is used to compensate for amplitude differences, thereby achieving active elimination of DC transmission current.

Benefits of technology

Under conditions of inconsistent wind turbine output, it significantly reduces the demand for filtering devices in the DC transmission system, reduces equipment size and investment costs, is suitable for space-constrained offshore wind power scenarios, and requires no additional hardware investment. The control method is simple and easy to apply.

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Abstract

The application provides a kind of active elimination method of DC ripple of wind power cluster sending-out system through diode dispersion rectification. In view of the strong time-varying characteristics of the harmonic amplitude and phase of the DC side of the diode rectification system changing with the output of the wind turbine and the reference phase of the AC side, which leads to the problem that the ripple suppression effect of the traditional fixed uniform interleaved angle control is limited, the method proposes an active elimination mechanism of DC ripple based on the negative gradient algorithm of the central controller. The central controller extracts the 12th harmonic amplitude and phase information of each DC branch current in real time, uses the negative gradient algorithm to minimize the total amplitude after the superposition of the 12th harmonic, dynamically adjusts the reference phase of the sinusoidal AC voltage of each wind turbine grid side, compensates the amplitude difference through active phase regulation, and realizes the closed cancellation of unequal amplitude harmonics under the condition of output imbalance. The application does not need to increase hardware, effectively suppresses the DC sending-out current ripple, significantly reduces the size and cost of the filter device, and is suitable for space-limited scenarios such as offshore wind power.
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