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Auxiliary decision-making system method for grounding line selection of urban distribution network based on expert system

A grounding line selection and expert system technology, applied in computer-aided design, electrical digital data processing, instruments, etc., can solve the problems of single monitoring means and the lack of large-scale deployment of distribution network automation

Active Publication Date: 2021-06-15
PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the voltage level that the system can monitor is limited to 10KV and above busbar voltage, and distribution network automation has not been deployed on a large scale. In the current environment, the intelligence of 10KV busbar outlet grounding line selection depends on the change of 10kV busbar voltage for judgment and monitoring means single

Method used

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  • Auxiliary decision-making system method for grounding line selection of urban distribution network based on expert system
  • Auxiliary decision-making system method for grounding line selection of urban distribution network based on expert system

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Embodiment 1

[0028] Embodiment 1. The present invention provides an expert system-based auxiliary decision system method for grounding line selection of urban distribution network, which divides line operation into two phases: normal phase and fault phase. The normal stage is relative to the fault stage, mainly including voltage phase sign, current phase sign, and switch closure status. In the normal stage, the control strategy mainly relies on the characteristics of the line, and the main purpose is to establish a knowledge base. Simply put, it is the status patrol of all lines and the maintenance of the knowledge base, and the load status, maintenance status, and user special requirements of the relevant lines are updated in a timely manner. . In the fault stage, the control strategy relies on the accumulation of knowledge base, and according to the relevant algorithm, the order of the failure rate of the outgoing line is obtained, which is used as a reference for the dispatcher to selec...

Embodiment 2

[0069] Embodiment 2. This embodiment provides a method for judging the grounding type according to the fault phase signs, specifically as follows:

[0070]

[0071] It can be seen from the table that when the fault phase voltage is zero and the other two phase voltages rise to the line voltage, it is metallic grounding. If the voltage of the faulty phase decreases but is less than zero, and the voltage of the other two phases increases but does not reach the line voltage, it is the series grounding generated by the resistance, also called non-metallic grounding. If the voltage of one phase decreases and the voltage of the other two phases increases, but the meter indication is unstable and swings, it is the intermittent arc single-phase grounding caused by tree branches or other objects hitting the wire. If the voltage of one phase drops or drops to zero, the voltage indication of the other two phases is normal, and the signal of "voltage loop disconnection" is reported, it...

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Abstract

The invention provides an auxiliary decision-making system method for grounding line selection of urban distribution network based on an expert system. Aiming at the randomness and multi-objective nature of distribution network scheduling, on the basis of the expert system, an online adjustment method based on manual intervention is introduced to reduce Small decision time and line selection accuracy error. The simulation model is built under the MATLAB software environment, and the actual circuit is used for simulation comparison. The comparison with the PID control algorithm shows that the algorithm is superior to the PID control algorithm, conforms to the actual operation of the power grid, can improve the accuracy of line selection, and reduce energy consumption. It meets the requirements of distribution network scheduling, and has good adaptability to different power grid operating environments, with high intelligence.

Description

technical field [0001] The invention relates to the technical field of distribution network grounding line selection, in particular to an expert system-based auxiliary decision system method for urban distribution network grounding line selection. Background technique [0002] When a single-phase grounding occurs in the distribution network, the regulations stipulate that it can operate with a ground fault for 2 hours. This is based on the fact that when the grounding current of the distribution network is small, most of the instantaneous grounding arcs can be extinguished by themselves. Moreover, when a single-phase grounding occurs in the distribution network, the voltage of the three-phase circuit line remains unchanged, which has little impact on the normal power supply. Most of the grounding arcs can be extinguished by themselves within two hours, which is very beneficial to improve the reliability of grid power supply. However, if the grounding current is large and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06Q50/06G06F113/04
CPCG06Q50/06G06F30/20
Inventor 张铮杰张磊王逸超许刘峰王向丽甄晓亚郭毅鹏付晓张彦兵
Owner PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN
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