Distribution network automatic local control and centralized control combination optimization method

Abstract

The invention relates to a distribution network automatic local control and centralized control combination optimization method. Short time delay is added to the quick-breaking moment of a transformersubstation switch, and a feeder line switch has voltage-time isolation and switch-on quick-breaking functions; next, an inquiry mechanism is established between an automatic system main station and an on-site terminal; and when the on-site terminal plans to perform automatic action, the on-site terminal inquiries permission from a background, and if there is no definite opinion received from thebackground within a specific time fame, the on-site terminal selects to perform automatic action. The optimization method has the following advantages as follows: by adoption of a comprehensive protection system which combines a V-T-I mode and a concentrated type mode adopted by power distribution automation modification, effective fault isolation and power supply recovery of a non-fault region can be realized within the shortest time frame, so that the shortcomings of main station erroneous judgment and feeder line automation failure caused by communication faults can be overcome, the power supply reliability is improved substantially, and forceful reference is provided for construction of power distribution automation; and meanwhile, work amount of one time of system modification can bereduced, and relatively high cost advantage is achieved.

Description

technical field [0001] The invention relates to the electrical field, in particular to a combined optimization method of local control and centralized control of distribution network automation. Background technique [0002] At present, there are mainly two modes of urban power distribution automation, one is the local type, and the other is the cluster judgment type, both of which are not satisfactory. [0003] The currently common on-site type is mainly a system based on the principle of time and voltage. For this type of on-site type, there are mainly the following problems: the transition to the standard mode cannot be made; all switches in the original distribution network must be replaced with smart switches, which cannot Make full use of the existing switchgear; the adaptability of the network is not strong, and when the network is complex, the time setting and coordination are difficult; whether it is a fault or a power cut, the line switch will be disconnected; the ...

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Problems solved by technology

[0003] The currently common on-site type is mainly a system based on the principle of time and voltage. For this type of on-site type, there are mainly the following problems: the transition to the standard mode cannot be made; all switches in the original distribution network must be replaced with smart switches, which cannot Make full use of the existing switchgear; the adaptability of the network is not strong, and when the network is complex, the time setting and coordination are difficult; whether it is a fault or a power cut, the line switch will be disconnected; the feeder switch needs to be reclosed twice, and the disconnection time is long

Is there a way to make full use of the existing equipment, without replacing the switch or updating the substation feeder protection module, to isolate the permanent fault through one coincidence, and to realize the free switching between the local mode and the centralized group judgment? In order to solve this problem, this paper proposes an improved voltage mode through system planning, which can effectively reduce the fault isolation time and the scope of influence on the basis of traditional feeder automation, and can be highly integrated with centralized group judgment to form a New comprehensive protection mode

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