CN109214707B - Power grid 110kV bus N-1 risk automatic scanning analysis method - Google Patents
Power grid 110kV bus N-1 risk automatic scanning analysis method Download PDFInfo
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Abstract
The invention relates to the field of electric power, in particular to an automatic risk scanning and analyzing method for a 110kV bus N-1 of a power grid.
Description
Technical Field
The invention relates to the field of electric power, in particular to an automatic risk scanning and analyzing method for a 110kV bus N-1 of a power grid.
Background
The modern society has higher and higher requirements on the power supply reliability of a power grid, finds weak links of the power grid in time, and takes corresponding pre-control measures, which is very important work related to whether the power grid can safely and stably run. The N-1 risk, also called a single fault risk, is a risk of a user power outage, damage to the stability of the system, voltage breakdown, and the like caused by a line trip after any independent element of N elements of the power system, such as a generator, a transmission line, a transformer, and the like, is cut off due to a fault.
The traditional real-time operation risk of the 110kV bus N-1 depends on manual analysis of a dispatcher according to data of a monitoring system and related information such as spare power automatic switching and safety and stability configuration, the efficiency is low, the accuracy is insufficient, and the operation stability of a power grid is influenced.
Disclosure of Invention
In order to solve the defect that the traditional real-time running risk of the 110kV bus N-1 is analyzed manually by a dispatcher in the prior art, the invention provides a method for automatically scanning and analyzing the risk of the 110kV bus N-1 of the power grid.
In order to realize the purpose, the technical scheme is as follows:
a method for automatically scanning and analyzing the risk of an N-1 bus of a 110kV power grid comprises the following steps:
step S1: acquiring topological correlation information of a 110kV bus, and carrying out power flow topology on a power grid;
step S2: analyzing the spare power automatic switching process of the 110kV line through a topological relation;
step S3: summarizing the analysis results of the step S2, writing the analysis results into fault consequence information of corresponding buses to form fault analysis results of single buses, and summarizing after analyzing one by one to form a primary analysis report;
step S4: correcting the power supply condition of multiple power supplies in the preliminary analysis report;
step S5: correcting the multiple spare power automatic switching situations in the preliminary analysis report;
step S6: judging total station voltage loss according to the corrected preliminary analysis report;
step S7: and forming an automatic risk scanning analysis report of all 110kV buses N-1 according to the analysis report corrected in the steps S4 and S5 and the judgment result of S6.
Preferably, step S1 specifically includes the following steps:
(1) generating a bus matching table; acquiring topological correlation information of a 110kV bus-coupled disconnecting link in a 220kV transformer substation, and if two buses are correlated on two sides of the bus-coupled disconnecting link, storing the buses with the structure in a bus pairing table; if one side associated with the disconnecting link is the disconnecting link and the other side is the bus, continuing to topology the disconnecting link until the switch or the bus stops, and storing a plurality of sections of buses obtained through topology in a bus matching table;
(2) carrying out power flow topology on any section of bus M1 to find all 110kV buses in the 220kV transformer substation which are supplied with power through M1, if the bus and M1 are in a bus pairing table, judging that M1 fails and loses voltage, the buses lose voltage at the same time, if the bus is not in the bus pairing table, judging whether the bus is supplied with power only through M1, if the bus can be supplied with power through other buses of the 220kV transformer substation or a 220kV main transformer, judging that no voltage is lost, and if not, judging that M1 fails and loses voltage, the buses lose voltage at the same time;
preferably, step S2 specifically includes the following steps:
acquiring a line L1 and a line L2 … set with active load > -0.3MW on all buses M1 and M2 … through topological relation and real-time equipment state data, analyzing a transformer substation for each line in a topological way, and performing spare power automatic switching result analysis according to a main transformer spare power automatic switching type maintenance table and a pilot spare power automatic switching maintenance table, wherein if no spare power supply exists or a new power supply channel can still trace back to a fault bus after spare power automatic switching action, voltage loss is judged, and if other conditions judge that the spare power automatic switching is successful, the voltage loss is not caused; for a user substation, spare power automatic switching judgment is not carried out, and a bus for supplying power to the user substation is directly subjected to voltage loss.
Preferably, step S4 specifically includes the following steps:
and (4) correcting the power supply conditions of multiple power supply points in the preliminary analysis report obtained in the step (S3), obtaining all the line pairs of the multiple power supply points supplying power to the same transformer substation through topological analysis, judging whether all the lines in the pair exist in the analysis report formed in the step (S3) one by one, if all the lines exist, correcting consequences without correcting consequences, and if only part of the lines exist, correcting the consequences of the lines in the preliminary analysis report in the pair to be no voltage loss.
Preferably, step S5 specifically includes the following steps:
analyzing the transformer substation without the standby power supply in the preliminary analysis report obtained in the step S3, and determining whether such a situation exists: the standby upper-level power supply is a 110kV transformer substation, the transformer substation is subjected to voltage loss caused by the same bus fault, power supply can be restored after one-time spare power automatic switching action, and if the voltage loss exists, the result is corrected to be no voltage loss.
Preferably, step S6 specifically includes the following steps:
and judging whether the transformer substation with the voltage loss result in the corrected analysis report is marked as total station voltage loss: and if all the equipment in the station are supplied with power by the same power supply and no idle bus or main transformer supplied with power by other power supplies exists, judging that the total station is in voltage loss, and otherwise, calculating the voltage loss result according to the number of the voltage loss 110kV buses.
Compared with the prior art, the invention has the beneficial effects that:
the method and the device utilize a computer system to rapidly and automatically analyze to obtain the 110kV bus N-1 risk report, avoid the defect of manual calculation, have strong timeliness and high accuracy, greatly improve the working efficiency, reduce the time cost and the labor cost, and increase the running stability of the power grid.
Detailed Description
Example 1
A method for automatically scanning and analyzing the risk of an N-1 bus of a 110kV power grid comprises the following steps:
step S1: acquiring topological correlation information of a 110kV bus, and carrying out power flow topology on a power grid;
step S2: analyzing the spare power automatic switching process of the 110kV line through a topological relation;
step S3: summarizing the analysis results of the step S2, writing the analysis results into fault consequence information of corresponding buses to form fault analysis results of single buses, and summarizing after analyzing one by one to form a primary analysis report;
step S4: correcting the power supply condition of multiple power supplies in the preliminary analysis report;
step S5: correcting the multiple spare power automatic switching situations in the preliminary analysis report;
step S6: judging total station voltage loss according to the corrected preliminary analysis report;
step S7: and forming an automatic risk scanning analysis report of all 110kV buses N-1 according to the analysis report corrected in the steps S4 and S5 and the judgment result of S6.
Preferably, step S1 specifically includes the following steps:
(1) generating a bus matching table; acquiring topological correlation information of a 110kV bus-coupled disconnecting link in a 220kV transformer substation, and if two buses are correlated on two sides of the bus-coupled disconnecting link, storing the buses with the structure in a bus pairing table; if one side associated with the disconnecting link is the disconnecting link and the other side is the bus, continuing to topology the disconnecting link until the switch or the bus stops, and storing a plurality of sections of buses obtained through topology in a bus matching table;
(2) carrying out power flow topology on any section of bus M1 to find all 110kV buses in the 220kV transformer substation which are supplied with power through M1, if the bus and M1 are in a bus pairing table, judging that M1 fails and loses voltage, the buses lose voltage at the same time, if the bus is not in the bus pairing table, judging whether the bus is supplied with power only through M1, if the bus can be supplied with power through other buses of the 220kV transformer substation or a 220kV main transformer, judging that no voltage is lost, and if not, judging that M1 fails and loses voltage, the buses lose voltage at the same time;
preferably, step S2 specifically includes the following steps:
acquiring a line L1 and a line L2 … set with active load > -0.3MW on all buses M1 and M2 … through topological relation and real-time equipment state data, analyzing a transformer substation for each line in a topological way, and performing spare power automatic switching result analysis according to a main transformer spare power automatic switching type maintenance table and a pilot spare power automatic switching maintenance table, wherein if no spare power supply exists or a new power supply channel can still trace back to a fault bus after spare power automatic switching action, voltage loss is judged, and if other conditions judge that the spare power automatic switching is successful, the voltage loss is not caused; for a user substation, spare power automatic switching judgment is not carried out, and a bus for supplying power to the user substation is directly subjected to voltage loss.
Preferably, step S4 specifically includes the following steps:
and (4) correcting the power supply conditions of multiple power supply points in the preliminary analysis report obtained in the step (S3), obtaining all the line pairs of the multiple power supply points supplying power to the same transformer substation through topological analysis, judging whether all the lines in the pair exist in the analysis report formed in the step (S3) one by one, if all the lines exist, correcting consequences without correcting consequences, and if only part of the lines exist, correcting the consequences of the lines in the preliminary analysis report in the pair to be no voltage loss.
Preferably, step S5 specifically includes the following steps:
analyzing the transformer substation without the standby power supply in the preliminary analysis report obtained in the step S3, and determining whether such a situation exists: the standby upper-level power supply is a 110kV transformer substation, the transformer substation is subjected to voltage loss caused by the same bus fault, power supply can be restored after one-time spare power automatic switching action, and if the voltage loss exists, the result is corrected to be no voltage loss.
Preferably, step S6 specifically includes the following steps:
and judging whether the transformer substation with the voltage loss result in the corrected analysis report is marked as total station voltage loss: and if all the equipment in the station are supplied with power by the same power supply and no idle bus or main transformer supplied with power by other power supplies exists, judging that the total station is in voltage loss, and otherwise, calculating the voltage loss result according to the number of the voltage loss 110kV buses.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (2)
1. A method for automatically scanning and analyzing the risk of an N-1 bus of a 110kV power grid is characterized by comprising the following steps:
step S1: acquiring topological correlation information of a 110kV bus, and carrying out power flow topology on a power grid;
step S2: analyzing the spare power automatic switching process of the 110kV line through a topological relation;
step S3: summarizing the analysis results of the step S2, writing the analysis results into fault consequence information of corresponding buses to form fault analysis results of single buses, and summarizing after analyzing one by one to form a primary analysis report;
step S4: correcting the power supply condition of multiple power supplies in the preliminary analysis report;
step S5: correcting the multiple spare power automatic switching situations in the preliminary analysis report;
step S6: judging total station voltage loss according to the corrected preliminary analysis report;
step S7: forming an automatic risk scanning analysis report of all 110kV buses N-1 through the analysis report corrected in the steps S4 and S5 and the judgment result of S6;
step S1 specifically includes the following steps:
(1) generating a bus matching table; acquiring topological correlation information of a 110kV bus-coupled disconnecting link in a 220kV transformer substation, and if two buses are correlated on two sides of the bus-coupled disconnecting link, storing the buses with the structure in a bus pairing table; if one side associated with the disconnecting link is the disconnecting link and the other side is the bus, continuing to topology the disconnecting link until the switch or the bus stops, and storing a plurality of sections of buses obtained through topology in a bus matching table;
(2) carrying out power flow topology on any section of bus M1 to find all 110kV buses in the 220kV transformer substation which are supplied with power through M1, if the bus and M1 are in a bus pairing table, judging that M1 fails and loses voltage, the buses lose voltage at the same time, if the bus is not in the bus pairing table, judging whether the bus is supplied with power only through M1, if the bus can be supplied with power through other buses of the 220kV transformer substation or a 220kV main transformer, judging that no voltage is lost, and if not, judging that M1 fails and loses voltage, the buses lose voltage at the same time;
step S2 specifically includes the following steps:
acquiring a line L1 and a line L2 … set with active load > -0.3MW on all buses M1 and M2 … through topological relation and real-time equipment state data, analyzing a transformer substation for each line in a topological way, and performing spare power automatic switching result analysis according to a main transformer spare power automatic switching type maintenance table and a pilot spare power automatic switching maintenance table, wherein if no spare power supply exists or a new power supply channel can still trace back to a fault bus after spare power automatic switching action, voltage loss is judged, and if other conditions judge that the spare power automatic switching is successful, the voltage loss is not caused; for a user substation, the spare power automatic switching determination is not carried out, and the fault of a bus supplying power to the user substation is directly subjected to voltage loss;
step S4 specifically includes the following steps:
correcting the power supply condition of multiple power supply points in the preliminary analysis report obtained in the step S3, obtaining that multiple power supply points are paired with all lines supplying power to the same transformer substation through topological analysis, judging whether all lines in the pairs exist in the analysis report formed in the step S3 one by one, if all lines exist, the consequences are not required to be corrected, and if only part of lines exist, the consequences of the lines in the preliminary analysis report in the pairs are corrected to be free of voltage loss;
step S5 specifically includes the following steps:
analyzing the transformer substation without the standby power supply in the preliminary analysis report obtained in the step S3, and determining whether such a situation exists: the standby upper-level power supply is a 110kV transformer substation, the transformer substation is subjected to voltage loss caused by the same bus fault, power supply can be restored after one-time spare power automatic switching action, and if the voltage loss exists, the result is corrected to be no voltage loss.
2. The method for automatically scanning and analyzing the risk of the N-1 of the 110kV power grid bus as claimed in claim 1, wherein the step S6 specifically comprises the following steps:
and judging whether the transformer substation with the voltage loss result in the corrected analysis report is marked as total station voltage loss: and if all the equipment in the station are supplied with power by the same power supply and no idle bus or main transformer supplied with power by other power supplies exists, judging that the total station is in voltage loss, and otherwise, calculating the voltage loss result according to the number of the voltage loss 110kV buses.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101800426A (en) * | 2010-03-31 | 2010-08-11 | 河南电力试验研究院 | Safety level evaluation method of power grid |
| CN103679546A (en) * | 2013-11-29 | 2014-03-26 | 国家电网公司 | N-1 calculating method for combined calculation of main networks and distribution networks and automatic spare-power switching actions |
| CN104537484A (en) * | 2014-12-22 | 2015-04-22 | 国家电网公司 | Power grid load loss risk assessment method based on PSASP model and emergency power supply automatic throw-in strategy |
| CN105515169A (en) * | 2014-09-26 | 2016-04-20 | 南京南瑞继保电气有限公司 | Multilevel spare power automatic switching system, priority cooperation method, and construction method |
| CN108521122A (en) * | 2018-04-13 | 2018-09-11 | 深圳供电局有限公司 | A kind of Contingency Analysis of Power Systems method considering prepared auto restart |
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- 2018-09-28 CN CN201811141741.6A patent/CN109214707B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800426A (en) * | 2010-03-31 | 2010-08-11 | 河南电力试验研究院 | Safety level evaluation method of power grid |
| CN103679546A (en) * | 2013-11-29 | 2014-03-26 | 国家电网公司 | N-1 calculating method for combined calculation of main networks and distribution networks and automatic spare-power switching actions |
| CN105515169A (en) * | 2014-09-26 | 2016-04-20 | 南京南瑞继保电气有限公司 | Multilevel spare power automatic switching system, priority cooperation method, and construction method |
| CN104537484A (en) * | 2014-12-22 | 2015-04-22 | 国家电网公司 | Power grid load loss risk assessment method based on PSASP model and emergency power supply automatic throw-in strategy |
| CN108521122A (en) * | 2018-04-13 | 2018-09-11 | 深圳供电局有限公司 | A kind of Contingency Analysis of Power Systems method considering prepared auto restart |
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