Load distribution method for multi-line power restoration after power distribution network fault
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A technology for distribution network faults and load distribution, applied in circuit devices, AC network circuits, electrical components, etc., can solve the problems of long time, poor solution stability, time consumption, etc.
Inactive Publication Date: 2013-08-21
HUNAN UNIV
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However, the traditional method for large-area power outage recovery is to divide the recovery power supply area according to the reserve capacity of the contact switch, and use the exhaustive method to sequentially disconnect the segmental switches in the power failure area to restore power supply, which has the problem of l
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[0067] Such as Figure 1-4 , the nouns involved in the present invention are explained as follows:
[0068] Non-fault outage area: The power outage area downstream of the faulty line fault after a fault occurs in the distribution network and the fault is removed.
[0069] No power loss area: The distribution network continues to maintain the normal power supply area after a fault occurs in the distribution network and the fault is removed.
[0070] Power supply path: the line from the power supply point to the tie switch node.
[0071] Primary support feeder: The power supply path whose tie switch is directly connected to the non-fault de-energized area.
[0072] Secondary supporting feeder: The supply path whose tie switch is connected to the primary supporting feeder.
[0073] Total load in the power-off area: the sum of all node loads (apparent power) in the non-fault power-off area.
[0074] Critical load distribution ratio: the percentage of the load distributed by th...
example 1
[0171] The present invention takes the IEEE33 node system as an example, when the node 6-7 line section fails to be removed, such as figure 2 shown.
[0172] 1) Nodes 7-17 become non-fault power-off areas, and the total load of the power-off areas is 966.29kW. There are three contact switches 7-20, 11-21, and 17-32 connecting the power supply area and non-fault power-off areas, as shown in the table 1.
[0173] 2) Set the reference voltage to 10kV, and the total load current I in the non-fault de-energized area = 96.629A.
[0174]3) According to the allowable deviation of the three-phase power supply voltage of 10kV and below in our country, the voltage threshold can be set to 9.33kV, and the steps (4), (5) and (6) in the fault recovery process of the distribution network can be set. ), the critical load distribution ratio of each tie switch is calculated, as shown in Table 2.
[0175] 4) Because the tie switches 7-20 and 11-21 are on the same line, only one of them is sel...
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Abstract
The invention discloses a load distribution method for multi-line power restoration after a power distribution network fault. The method is a calculating method used for how to divide load in a non-failure power-losing district after the power distribution network fault is removed and distribute the load to multiple power supply paths to restore power supply. The load distribution steps are as follows: calculating the extreme load distribution ratio and the critical load sharing ratio which correspond to each power supply path; and confirming the optimal load distribution ratio. According to the method, least power loss of a non-power-losing district is aimed at to obtain the extreme load distribution ratio, the critical load sharing ratio is obtained through voltage and current safety restriction, the extreme load distribution ratio and the critical load sharing ratio are considered in a combined mode to adjust load distribution so as to meet safe economy requirements and obtain the optimal load distribution ratio, and therefore a reasonable and effective load distribution scheme is confirmed, and a power-losing district is divided, and network failure reconstruction is completed. The load distribution method for the multi-line power restoration after the power distribution network fault is simple, convenient and effective, is favorable to realizing quick fault restoration, and optimizes distribution network operation.
Description
technical field [0001] The invention belongs to the field of distribution network fault reconstruction, relates to a load distribution method for multi-line power supply recovery after a distribution network fault, and is a method for how to restore non-fault power loss areas through multiple support lines after a distribution network fault is removed. Calculation method of power supply. Background technique [0002] my country's distribution network has the characteristics of closed-loop design and open-loop operation. There are sectional switches and tie switches in the distribution network. During normal operation, the sectional switches are closed to transmit power to the load, forming a radial network. Contact switch, when the line is faulty, the segmental switches at both ends of the fault point jump to remove the fault, the power supply of the upstream part of the fault point remains unchanged, and the downstream part will lose power, becoming a non-fault power loss ar...
Claims
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