A direct current voltage control method, device and medium

By employing a constant power control converter and multi-segment DC voltage proportional regulation control in a hybrid cascaded DC transmission system, the problems of system stability and regulation speed were solved, achieving fast response and stable DC voltage control, and enhancing the system's anti-interference capability.

CN117375057BActive Publication Date: 2026-07-24NR ELECTRIC CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NR ELECTRIC CO LTD
Filing Date
2022-06-30
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In existing technologies, the method of regulating DC voltage by a single converter in hybrid cascaded DC transmission systems cannot meet the system stability requirements. The regulation speed is slow and DC oscillations are prone to occur, especially during power fluctuations or faults.

Method used

A constant-power control converter combined with multi-segment DC voltage proportional regulation control is adopted to achieve stable DC voltage control through graded adjustment of rate and power. Specific steps include: maintaining constant power when the voltage deviation is less than a threshold range; initiating stage I regulation when the deviation is within the threshold range; and initiating both stage I and stage II regulation when the deviation exceeds the threshold range, with the adjustment rate gradually increasing.

Benefits of technology

It achieves rapid response and stability under DC voltage fluctuations, suppresses DC voltage oscillations, enhances system stability, prevents overvoltage and undervoltage problems, and improves the system's dynamic response capability.

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Abstract

The application discloses a direct-current voltage control method, equipment and medium, and belongs to the technical field of power system flexible power transmission. The control method realizes direct-current voltage control of a direct-current power transmission system through a constant-power control converter. When a direct-current voltage fluctuates, the size of a deviation value is judged. When the deviation is smaller than the minimum value of a threshold range, the constant-power control converter accurately controls power at a power control target instruction value. When the deviation fluctuates within the threshold range, only a first-stage direct-current voltage proportional regulation control is started. When the deviation exceeds the threshold range, a second-stage direct-current voltage proportional regulation control is additionally started. Through hierarchical input of multiple-stage direct-current voltage proportional regulation control, abnormal fluctuation of a direct-current bus voltage caused by system dynamic change or disturbance is coped with, the problem of rapid elimination of direct-current voltage disturbance shock is realized, the problems of direct-current overvoltage and under-voltage are inhibited, the direct-current voltage is supported, the system stability is enhanced, and the problem of cascaded LCC valve commutation failure is resisted.
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Citation Information

Patent Citations

  • CN103178539A

  • CN105870909A

  • CN106058842A