Method for processing boundary information deficiency of centralization protector of digitalized converting station

Abstract

The invention discloses a method for processing boundary information deficiency of a centralization protector of a digitalized converting station, which comprises the following steps that: the centralization protector collects current and voltage values of the whole converting station and the states of circuit breakers, and acquires voltage and current sampling value information of the whole converting station in real time; when faults happen, if the current sampling value information of one line is deficient, a current sampling value of the information deficient line is synthesized on the premise that a bus is supposed to have no faults, and then a bus voltage and a line current sampling value are used, wherein the information deficient line adopts a resultant current, and the faults are removed through conventional line protection; and if the faults are detected on a first section of the conventional protection of the information deficient line, the circuit breaker of the line is tripped off without delay, and then the conventional bus differential protection is used for detecting whether the bus has the faults or not so as to determine whether to trip off all the circuit breakers connected with the bus. The method can quickly position the faults and remove the faults of boundary regions, greatly simplifies the cooperating setting of protection, and improves the reliability of the protection.

Description

technical field [0001] The invention relates to the field of relay protection of electric power systems, in particular to a processing method for the case of missing information at the boundary of a centralized protection device of a digital substation. Background technique [0002] At present, with the formulation of the IEC61850 communication protocol, digital substations based on this protocol have developed rapidly in my country. Compared with the electromagnetic transformers used in traditional substations, digital transformers use digital transformers. The electrical quantities such as current and voltage collected by the digital transformer are digital quantities, which realizes the effective electrical isolation of the primary and secondary systems, increases the measurement range of electrical quantities, improves the measurement accuracy, and overcomes the traditional transformer saturation problem. Digital transformers are all digital from information acquisition...

AI Technical Summary

Problems solved by technology

However, centralized processing of a large amount of information will inevitably lead to network congestion

When a fault occurs, if the sampling value information is missing, especially the boundary information, it will inevitably affect the reliability of the centralized protection device

When a fault occurs, when the boundary information is lost, the backup protection action with a large delay and poor selectivity is often used to remove the fault, which expands the scope of the power outage and causes serious harm to the national economic life.

At present, in the information processing mechanism of the centralized protection device processing method of the digital substation, no good response method has been proposed to deal with this kind of problem.

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