Adaptive cascade direction interlocking relaying method based on GOOSE (Generic Object Oriented Substation Event)

Abstract

The invention relates to an adaptive cascade direction interlocking relaying method based on GOOSE (Generic Object Oriented Substation Event), which comprises the following steps: 1) initial interlocking directions of protective relays are set according to an initial interlocking direction tuning rule; 2) a directional element judges the direction of a current fault current which is compared with the initial interlocking directions by a direction comparator to judge whether the directions of two parts are the same, if yes, the step 3) is carried out, if not, IN2 is gated, and a interlocking signal is output to OUT2; 3) the direction comparator gates IN1, and outputs the interlocking signal to the OUT1 and the direction of the output signal is opposite from the initial interlocking direction at this time; 4) a receiving virtual terminal judges whether the interlocking signal is received, if yes, the interlocking is carried, if not, the step 5) is carried out; and 5) an over-current element judges whether the current fault current exceeds a local over-current protection starting fixed value, if yes, a trip signal is sent. In comparison with the prior art, the method has the advantages that the safe and reliable operation of a system is ensured and applicability is good.

Description

technical field [0001] The invention relates to a protection method of an intelligent distribution network, in particular to a GOOSE-based adaptive cascading direction blocking relay protection method. Background technique [0002] The traditional distribution network adopts a radial topology and is powered by a single-side power supply. Its relay protection is also designed based on this architecture. [0003] However, for a smart distribution network connected to a large number of distributed generation (Distributed Generation, DG), the operating characteristics will change significantly, such as bidirectional power flow, ring power supply, and changes in short-circuit current characteristics. Since the fault current flows into both ends of the fault point, it will cause the fault current to flow through the protection of various places along the way, which brings great challenges to the existing protection system. [0004] According to whether the protection principle de...

AI Technical Summary

Problems solved by technology

However, there is no good solution for the failure of the low-voltage side busbar of the distribution network substation and the public connection point of the microgrid.

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