Service restoration method for multi-faults in distribution network

Patent metadata

Field	Value
Publication number	US-2016190789-A1
Application number	US-201414784788-A
Country	US
Kind code	A1
Filing date	Jun 19, 2014
Priority date	Nov 28, 2013
Publication date	Jun 30, 2016
Grant date	—

Abstract

A multi-faults service restoration method for a power distribution network overcomes the defect that a traditional service restoration method for the power distribution network cannot solve multi-faults. The method includes the steps of performing multi-faults judgment on multi-faults with processing unfinished, to form many multi-faults and many single-faults; then performing unaided fault recovery area division on the multi-faults, and performing power restoration on unaided fault recovery areas one by one; and after the multi-faults are processed, performing power restoration on each single-fault. By adopting the method, the service restoration efficiency is greatly improved, thus contributing to the real-time of service restoration; the factor of load balance is considered when common power restoration lines are decoupled, so that the load rates of the power restoration lines participating in service restoration are more similar after service restoration, and therefore the power supply reliability of the power distribution network is improved.

First claim

1 . A multi-faults service restoration method for a power distribution network, comprising the following several steps:
(1) stopping executing an original fault processing strategy with executing unfinished; (2) turning on outlet circuit breakers for fault lines; (3) re-dividing unaided fault recovery areas: if some fault recovery areas subjected to single-fault are connected by a loop switch and these fault recovery areas subjected to single-fault are connected with the remaining fault recovery areas subjected to single-fault by at least one power restoration line, regarding these fault recovery areas subjected to single-fault as a whole, and calling them as unaided fault recovery areas; (4) determining common power restoration lines and unaided power restoration lines for the unaided fault recovery areas; (5) re-determining multi-faults; (6) performing multi-faults service restoration; (7) forming a service restoration scheme for the fault recovery areas subjected to single-fault by using a single-fault service restoration method; wherein if the power distribution network has only one fault, this fault is a single-fault, the single-fault service restoration algorithm is a traditional service restoration algorithm when the power distribution network has only one fault.

2 . The multi-faults service restoration method for the power distribution network of claim 1 , wherein in step (3), the specific method for re-dividing unaided fault recovery areas is as follows: after a new fault occurs, the downstream of the new fault line becomes a new fault recovery area; if there are unaided fault recovery areas connected with the new fault recovery area by a loop switch, these unaided fault recovery areas and the new fault recovery area form new unaided fault recovery areas.

3 . The multi-faults service restoration method for the power distribution network of claim 1 , wherein in step (4), the unaided power restoration lines are defined as follows: if a certain power restoration line for multi-faults recovery areas can only supply power to an unaided fault recovery area, the power line is an unaided power restoration line for the unaided fault recovery area; the common power restoration lines are defined as follows: if a certain power restoration line can supply power to several unaided fault recovery areas, the power line is a common power restoration line for these unaided fault recovery areas.

4 . The multi-faults service restoration method for the power distribution network of claim 1 , wherein step (5) specifically comprises the following steps:
(5-1) randomly selecting one unaided fault recovery area, finding all common power restoration lines for the unaided fault recovery area, then finding unaided fault recovery areas connected with the common power restoration lines, setting these unaided fault recovery areas as a first layer of unaided fault recovery areas, and randomly sequencing the unaided fault recovery areas; (5-2) selecting each unaided fault recovery area on the layer in sequence, and further finding the common power restoration lines connected with the unaided fault recovery areas of the first layer and unaided fault recovery areas connected with the common power restoration lines to form a second layer of unaided fault recovery areas; selecting each unaided fault recovery area on the layer in sequence, and forming the unaided fault recovery areas of the second layer according to the method for forming the unaided fault recovery areas of the first layer; (5-3) proceeding while following the same principle, wherein after limited steps, failures involved by the unaided fault recovery areas of all the layers form multi-faults.

5 . The multi-failure power restoration method for the power distribution network of claim 1 , wherein step (6) specifically comprises the following steps:
(6-1) calculating spare coefficients: calculating a spare coefficient for each unaided fault recovery area in the absence of a common power restoration line according to a formula S %=S′/S×100%, wherein S is the power loss load of the unaided fault recovery area, and S′ is the sum of the spare capacity of the unaided power restoration lines for supplying power to the unaided fault recovery area; (6-2) performing power restoration on the unaided fault recovery areas one by one according to the spare coefficients from big to small.

6 . The multi-failure power restoration method for the power distribution network of claim 5 , wherein step (6-2) comprises the following specific steps:
(a) performing power restoration on the unaided fault recovery areas by using unaided power restoration lines: when power restoration is performed on a certain unaided fault recovery area, if the power supply to all the power loss loads is restored, the common power restoration line does not participate in the power restoration of the fault recovery areas any more; if the power supply to all the power loss loads can not be restored, a common power restoration line with largest spare capacity is added for new power restoration; if the power supply to all the power loss loads still can not be restored, a common power restoration line is further added, till all the power loss loads are restored or no common power restoration line exists; (b) transforming the common power restoration lines: after the power restoration of a certain unaided fault recovery area is finished, if some common power restoration lines connected with the certain unaided fault recovery area only supply power to an unaided fault recovery area, these common power restoration lines are transformed into corresponding unaided power restoration lines for the unaided fault recovery area; and if the load rate of the part of the common power restoration lines connected with the certain unaided fault recovery area is greater than the spare coefficient of the to-be-restored unaided fault recovery areas connected with these common power restoration lines, the part of the common power restoration lines do not participate in the power restoration of the to-be-restored unaided fault recovery areas any more.

Assignees

• State Grid Corp China
• Laiwu Power Supply Company Of State Grid Shandong Electric Power Company

Inventors

• Zhu Guofang
• Li Hongmei
• Niu Jincang
• Zhao Baoguang
• Li Shangzhen
• Shi Xin
• Li Yong
• Liu Xujie
• Wu Guanbin
• Xu Naiyuan
• Li Sun
• Liang Yuanbin

Classifications

• H02J3/0073 Primary

  by providing alternative feeding paths when the main path fails · CPC title

• H02H7/22

  for distribution gear, e.g. bus-bar systems; for switching devices {(detecting mechanical or electrical defects in gas-insulated switchgears H02B13/065)} · CPC title

• H02H1/0092 Primary

  concerning the data processing means, e.g. expert systems, neural networks · CPC title

• Y02E40/70

  Smart grids as climate change mitigation technology in the energy generation sector · CPC title

• Y04S10/50

  Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications · CPC title