Millisecond-level rapid reconfiguration method and system of power supply network after power grid fault

Abstract

The invention provides a millisecond-level fast reconfiguration method and system for a power supply network after a power grid fault. Fast network reconfiguration The main station collects grid status information from substations or substations of power plants, and compares it with the built-in control strategy table that may fail; The corresponding sub-station sends a closing pre-start signal; when the fault is cleared, the sub-station identifies the clearing time according to the local information, and sends a detection synchronous closing signal to the corresponding local recovery network circuit breaker; at the same time, the main station independently monitors To clear the fault, send a backup inspection synchronous closing signal to the corresponding recovery network circuit breaker, based on the above mechanism, the disconnected power grid will be re-connected to the grid within 150ms after decommissioning. After the power grid is restored to interconnection, the circuit breakers forming the electromagnetic ring network are opened.

Description

technical field [0001] The invention relates to the technical field of power grid control, in particular to a millisecond-level fast reconfiguration method and system for a power supply network after a power grid fault. Background technique [0002] After an external network accident or internal network failure occurs in the regional power grid, due to the interruption of some power supply paths, islands of the entire regional power grid or some regional power grids may be formed. When the lost power supply accounts for a large proportion, and there is a large power difference between the power generation and the load in the island, it is necessary to take measures to cut off the machine or load to realize the frequency stability of the island power grid, which not only has a great impact on the production power supply, but also temporarily stabilizes It is still very difficult to maintain continuous and stable operation of the island power grid in the future. Therefore, af...

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Problems solved by technology

[0004] (1) The existing fast switching device can only obtain the information of the local busbar or incoming line, and cannot consider the restoration of the power supply path from the perspective of the entire network, especially cannot perform multi-point closing according to the remote fault information, thus limiting the power supply Optional access for path restoration, reducing the probability of restoring grid connectivity and integrity

[0005] (2) Conventional fast switching needs to rely on switch tripping or related protection signals to start. However, when a remote external system failure occurs in the power grid, there is no switching action in the area monitored by the conventional power fast switching device, and the fast switching device cannot be started. However, the frequency and voltage A crash is occurring. If the faulty system is not isolated in time and switched to the normal power system, the load supplied by the faulty power supply will lose power supply

[0006] (3) The locally selected power supply may have a problem of insufficient capacity. At this time, it is necessary to select more power supply capacity in the remote place for support

[0007] (4) There may be an overload problem in a single power supply path, and multiple power supply paths are required at this time

[0008] (5) There is a possibility of failure due to the failure of the synchronous conditions to meet the requirements of the fast switching of the power supply. After the conventional single fast switching point fails, the entire fast switching defense line fails, and there is no backup measure

[0009] In addition, the existing methods called grid network reconfiguration methods or grid self-healing methods are all based on conventional switch switching operations. After grid faults cause loads to be powered off and shut down, then power is restored; therefore, this type of solution The method cannot meet the requirement of restoring power supply within 150ms after the fault is removed, and cannot realize the purpose of restoring power supply without stopping the load such as the motor, so the problem solved by the present invention does not belong to the same scope

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