Analysis system and method for the influence of AC transient voltage on DC control and protection system

Abstract

The invention relates to a system and a method of analyzing the influence of AC transient voltage on a DC control protection system. The system comprises an AC system transient voltage acquisition module used for collecting an AC system transient process, a characteristic parameter extraction module used for extracting the characteristic parameters of AC transient voltage according to the acquired AC system transient process, a DC system influence function acquisition module used for acquiring a DC system influence function according to the characteristic parameters, and a DC system optimization module used for generating the control protection logic and parameters of an optimized DC control protection system according to the DC system influence function. Compared with the prior art, the system and the method have the advantages of convenience, reliable analysis result, and the like.

Description

technical field [0001] The invention relates to the field of direct current system operation technology and electric power system electromagnetic transient analysis, in particular to an analysis system and method for the influence of alternating current transient voltage on a direct current control and protection system. Background technique [0002] Due to the continuous improvement of modern industrial production's requirements on the quality of power consumption, transient problems such as voltage drop, rise or interruption in the power supply system will affect the normal operation of the production process, especially for petrochemical, papermaking, power plants and other production processes. Fatal damage. The failure of the power transmission and distribution system causes the voltage of the power supply system to drop, cut off or rise, causing the load to fail to work normally, thus affecting the normal operation of the production process. Therefore, analyzing the t...

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Problems solved by technology

[0003] Judging from the data provided by the dispatching operation, since several UHVDC transmission projects were put into operation, they have suffered from AC grid failures and unexplained interferences for many times, resulting in DC blockage and sudden loss of transmission power, which have an adverse impact on the stable operation of the grid.

The reason may be that the transient process of voltage is generated during the change of some operating modes, and there is still a lack of research on the impact of these transient processes on the DC system.

[0004] With the increasing capacity of the DC transmission system, the DC access points and landing points at the sending and receiving ends are becoming more and more concentrated, and the interaction with the AC grid is becoming more and more significant, and the electromagnetic transient characteristics of the corresponding AC system become more and more important. , which poses a challenge to the long-term stable operation of the UHV AC-DC hybrid system that has been put into operation

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