A Checking Method of DC Protection Fixed Value

Abstract

The present invention discloses a direct current protection setting value checking method, and relates to the technical field of direct current control protection, so as to improve checking efficiency of direct current protection setting values. The direct current protection setting value checking method comprises: establishing a simulation model of a direct current transmission system in an EMTDC platform, and acquiring fault data, on which direct current protection needs to be performed, of the direct current transmission system; in an operation platform that is mutually independent from the EMTDC platform, establishing a user-defined direct current protection model of which operation precision is the same with the operation precision of the simulation model of the direct current transmission system, and taking the fault data as input variables of the user-defined direct current protection model; and setting a direct current protection setting value, simulating operation of the user-defined direct current protection model, determining a protection action of the user-defined direct current protection model under an action of the direct current protection setting value, and determining whether the protection action meets a target requirement. The direct current protection setting value checking method provided by the present invention is used for direct current protection of the direct current transmission system.

Description

technical field [0001] The invention relates to the technical field of direct current control and protection, in particular to a method for checking the fixed value of direct current protection. Background technique [0002] As the core of the DC transmission secondary system, the reliability of DC protection directly determines the safety of DC transmission equipment and the stable operation of the power grid where the DC transmission system is located. Before applying the DC protection to the DC transmission system, it is necessary to perform a simulation check on the DC protection setting to ensure that the DC protection can operate correctly in the DC transmission system and realize the transmission protection of the DC transmission system. [0003] Currently, see figure 1 , the commonly used DC protection setting value checking method is to build a DC engineering simulation model including the DC transmission system and DC protection in the DC electromagnetic transient...

AI Technical Summary

Problems solved by technology

[0004] However, when checking the DC protection setting through EMTDC simulation, since there are many fault conditions in the DC transmission system, there are many factors that need to be considered when considering the possible fault conditions of the DC transmission system, such as: fault location , wiring mode, AC system operation mode, DC power, fault time, fault distance on the DC line, DC voltage, etc.; among them, there are multiple options for each consideration factor, so that the combination of various consideration factors needs to be simulated. It can be as high as hundreds, and the DC engineering simulation model has more junction nodes, which leads to a long time-consuming to complete an EMTDC simulation, resulting in low efficiency in the verification of DC protection settings

Not to mention, when the results of the EMTDC simulation prove that the DC protection setting fails to meet the use requirements, on the basis of properly adjusting the DC protection setting, it is necessary to repeat the EMTDC simulation verification of multiple working conditions, which will multiply The time-consuming EMTDC simulation makes the checking efficiency of DC protection setting extremely low

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