New energy reactive power control method for suppressing transient overvoltage of DC sending-end power grid

By estimating the power grid voltage change trend and delay compensation of power commands, reactive power advance control is realized, solving the problems of high transient overvoltage suppression cost and affecting DC control performance in the prior art, and it has the advantages of economical and engineering practicality.

CN119787381AActive Publication Date: 2025-04-08SOUTHWEST JIAOTONG UNIV
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Patent Information

Application Number
CN202411961929.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-04-08
Estimated Expiration
2044-12-30

AI Technical Summary

Technical Problem

When the prior art suppresses the transient overvoltage of the LCC-HVDC transmission terminal power grid, additional reactive power compensation equipment is often required to increase construction and maintenance costs, or adjust DC control strategies to affect the dynamic performance of the DC control system.

Method used

The grid voltage change trend is estimated through the current and historical signals of the grid voltage, resulting in the effect of reactive power advance control, and delay compensation is performed on the power command signal to offset the reactive power lag and ensure that the leading reactive power can be applied to overvoltage suppression.

Benefits of technology

The suppression of transient overvoltage is achieved, avoiding the introduction of additional equipment and the influence of DC control performance, and has the advantages of high economicality and low control cost.

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Abstract

The invention discloses a new energy reactive power control method for transient overvoltage suppression of a direct-current sending-end power grid, and the method comprises the steps: estimating the change trend of the voltage of a power grid through the current and historical signals of the voltage of the power grid, calculating the additional value of a reactive power instruction to generate a reactive power advanced control effect, and combining a reactive power optimization value subjected to delay compensation. And the instruction value can ensure that the new energy effectively outputs reactive power to participate in transient overvoltage suppression of the direct current converter station. According to the method, the new energy reactive power instruction value can be improved and optimized only on the basis of the existing electrical quantity observation signal without modifying the topological structure of a direct current converter station and a new energy power generation system and without additionally arranging various reactive compensation devices or various voltages or voltage sensors; no additional influence is generated on links such as new energy power instruction tracking control and direct current converter station power control, and the method has good engineering practicability and scene adaptability.
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