Dynamic reactive power support operation method of hybrid commutation converter, converter and equipment

By using RB-IGCT and water-cooled MOV in the hybrid commutator, combined with advanced shutdown mode and firing angle adjustment, the problem of reactive power demand in the hybrid commutator was solved, achieving dynamic reactive power support and improved system stability.

CN120914819APending Publication Date: 2025-11-07TSINGHUA UNIVERSITY +1
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Patent Information

Application Number
CN202510820471.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-18
Publication Date
2025-11-07

AI Technical Summary

Technical Problem

With the expansion of DC feed-in scale, the dynamic reactive power support of the receiving-end power grid is insufficient, and existing filters cannot provide flexible dynamic reactive power support. The reactive power demand of hybrid commutated converters (HCCs) has not yet been effectively resolved.

Method used

By replacing the thyristor with a reverse-resistance integrated gate commutator thyristor (RB-IGCT) and combining it with a water-cooled MOV, the hybrid commutator can achieve reactive power output in the second quadrant angle range through the advanced turn-off mode and trigger angle adjustment, thereby enhancing heat dissipation and supporting four-quadrant power operation.

Benefits of technology

This enables the hybrid commutator to output reactive power while improving system stability and security during dynamic reactive power support operation, thus meeting the dynamic reactive power requirements of the power grid.

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Abstract

The invention discloses a dynamic reactive power support operation method of a hybrid commutation converter, the converter and equipment. The method comprises the following steps: detecting whether the hybrid commutation converter has a reactive power demand or not; starting an advanced turn-off mode under the condition that the hybrid commutation converter has a reactive power demand; determining an initial trigger angle according to a preset target reference value and the output value of the hybrid commutation converter; adjusting the initial trigger angle in a preset second quadrant angle range to obtain a target trigger angle; the next trigger bridge arm is triggered and conducted based on the target trigger angle, so that the hybrid commutation converter outputs reactive power, and the range of the second quadrant angle is 180-270 degrees; according to the embodiment of the invention, the hybrid commutation converter can be supported to realize advanced turn-off in the second quadrant angle range, and the target trigger angle of the next trigger bridge arm is dynamically adjusted by adjusting the initial trigger angle, so that the dynamic reactive power support technology of the hybrid commutation converter is realized.
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