An adaptive search method for tripped circuit breakers based on Dijkstra algorithm

Abstract

The invention discloses a trip-out breaker adaptive search method based on Dijkstra algorithm, and the method comprises the following steps: 1) obtaining the adjacency matrix of the circuit breaker and the adjacency matrix of the protected element and the circuit breaker; 2) updating and correcting the adjacency matrix of the protected element and the circuit breaker; 3) determining whether there is a faulty element in the smart grid; 4) calling the Dijkstra algorithm module to make a first judgment and to obtain the trip-out circuit breaker; 5) performing a first updated correction to the adjacency matrix of the breaker; 6) determining whether the trip-out circuit breaker fails or not; 7) determining whether the direct current power supply disappears or not; 8) performing a second updated correction to the adjacency matrix of the breaker after the first updated correction and 9) calling the Dijkstra algorithm module to make a second judgment and getting the number of the trip-out circuit breaker finally. According to the invention, the adaptive search time is short, and the method is very adaptive for onsite main wiring manner and the change in the running mode so as to ensure that the cutting scope of the trip-out breaker is minimal.

Description

technical field [0001] The invention belongs to the technical field of trip search for circuit breakers in smart grids, and in particular relates to an adaptive search method for trip circuit breakers based on Dijkstra algorithm. Background technique [0002] With the in-depth construction of the smart grid, it will accelerate the transformation of the global energy Internet from dream to reality. Since the global energy Internet spans time zones and regions, the scale of the smart grid will continue to expand, and the complexity is self-evident. It is increasingly difficult for traditional relay protection systems to adapt to the rapid development of smart grids. The wide-area protection system with advanced information and communication technology provides a new way to solve the protection and control problems of smart grids. [0003] At present, in the smart grid, there are failures of protected components, failure of circuit breakers, and disappearance of DC power suppl...

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Problems solved by technology

However, its tripping circuit breaker cannot automatically adapt to the change of bus operation mode

In addition, the search method for tripping circuit breakers based on directional weights forms a node-branch correlation matrix through electrical quantities that do not require strict information synchronization, but relies on a large amount of information, and it does not consider the bus connection form and the operation of circuit breakers in substations. The specific circuit breaker search method after the state change makes the trip circuit breaker search method only adaptable to the specific bus wiring mode and operation mode

Secondly, based on the search method of tripped circuit breaker based on Petri net model, the Petri net model is applied to the search of tripped circuit breaker sequence, and the search method of circuit breaker within substation and between substations in smart grid is analyzed, based on The tripped circuit breaker search method of the Petri net model can adapt to the complex wiring mode in the substation in the smart grid, but for the continuous circuit breaker failure, it needs to call the tripped circuit breaker search method repeatedly and cannot identify the final trip after the tripped circuit breaker fails. Circuit breaker, the search time is long, and the remote backup protection trip for the loss of DC power cannot guarantee the fault is removed within the minimum range and the delay is long

[0005] To sum up, the search method for tripping circuit breakers in the prior art has limitations in the form of busbar wiring, takes a long time to search, and cannot identify the entire tripping path at one time, so as to ensure that the removal range of subsequent tripping circuit breakers is the smallest, and cannot Well meet the needs of the practical application of smart grid

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