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A full-dimensional distribution network loop closure evaluation method

A distribution network, full-dimensional technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problem of accuracy of calculation results, difficulty in ensuring reliability, difficulty in considering calculation conditions, heavy workload, etc. problems, to achieve the effect of ensuring the interests of users, reducing power outage losses, and improving work efficiency

Active Publication Date: 2021-03-30
DEYANG POWER SUPPLY COMPANY STATE GRID SICHUAN ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relying on manual calculations not only has a heavy workload and low efficiency, but also makes it difficult to fully consider various calculation conditions, and it is difficult to guarantee the accuracy and credibility of the calculation results. Judgments based on operating experience often make mistakes

Method used

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  • A full-dimensional distribution network loop closure evaluation method
  • A full-dimensional distribution network loop closure evaluation method
  • A full-dimensional distribution network loop closure evaluation method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The present invention is a full-dimensional distribution network loop closure evaluation method, a full-dimensional distribution network loop closure evaluation method, including:

[0037] (1) Establish the analysis model of the loop closing operation of the distribution network; the analysis model of the loop closing operation of the distribution network, including the loop closing mode model, the loop closing impulse current calculation model and the loop closing operation load model.

[0038] (2) According to the established analysis model of distribution network loop closure operation, calculate the voltage deviation of each busbar before and after loop closure, the fixed value of quick-break protection current after loop closure and the thermal stability limit value of equipment, and the voltage deviation of each busbar before and after loop closure, After the ring is closed, when the fixed value of the quick-break protection current and the thermal stability limit ...

Embodiment 2

[0102] Taking Deyang as an example, the typical distribution network closed-loop line in Deyang, the calculation basic data are shown in the table below.

[0103] Table 1 Transformer parameter table

[0104]

[0105] Table 2 Line parameter table

[0106]

[0107] Table 3 Load distribution

[0108]

[0109]

[0110] In order to obtain the maximum circulating current value under the closed loop state, the operation mode of the 10kV bus coupler in the 110kV Bajiao station and the 110kV Lushan station is simulated and calculated, and the following power flow calculation is performed using the operation mode with the largest voltage amplitude difference on both sides of the closed loop point , ring closure calculation, fault calculation, etc. Table 4 shows the voltage amplitude difference on both sides of the loop closing point calculated by simulation.

[0111] Table 4 Voltage amplitude difference in different operating modes

[0112]

[0113] from Figure 11 C...

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Abstract

A full-dimensional distribution network loop closure evaluation method includes establishing an analysis model of loop closure operation of a distribution network; calculating the voltage deviation ofeach bus bar before and after loop closure, the setting value of protection current after loop closure and the thermal stability limit value of equipment according to the established loop closure operation analysis model; when the voltage deviation of each bus bar before and after loop closure, the setting value of protection current after loop closure and the thermal stability limit value of equipment meet the requirements of loop closure, allowing loop closure. The transient and steady-state faults are analyzed and checked in the closed-loop state. If the fault can be removed, the closed-loop operation analysis model of distribution network is controllable. The method avoids the instability of the power network caused by loop closure, so as to ensure the interests of users, reduce poweroutage losses, effectively improve the reliability of power supply, and improve the safe and economic operation level of distribution network; at the same time, the efficiency of the switchover operator can be improved.

Description

technical field [0001] The invention relates to the field of distribution networks of electric power systems, in particular to a method for loop closure evaluation of a full-dimensional distribution network. Background technique [0002] With the progress of power grid construction, the 35kV and 10kV distribution network structure of the power grid has gradually improved, and most areas have realized the ring grid structure. In the normal operation mode, each ring network of the distribution network is in open-loop operation somewhere, and the distribution network load is powered by different main network power sources. The network load is transferred to another power source for power supply. In the past, the "cold switching" method was often used in the power distribution network, that is, the method of power failure switching. This method will interrupt the power supply to users. Depending on the operation method and complexity, the power interruption time varies from a f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 尹琦丁睿程钢马丹丹黄潇丁茂桃刘青丽金磊安琪冯诚铭杨英陈翔喻伟徐艳邓颖康宁陈玉洁张蓉
Owner DEYANG POWER SUPPLY COMPANY STATE GRID SICHUAN ELECTRIC POWER
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