CN109191006B - Method for automatically scanning and analyzing risk of N-1 of 110kV main transformer of power grid - Google Patents
Method for automatically scanning and analyzing risk of N-1 of 110kV main transformer of power grid 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 main transformer 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 main transformer 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 main transformer 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 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 conventional real-time operation risk of the 110kV main transformer 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 main transformer N-1 of a power grid.
In order to realize the purpose, the technical scheme is as follows:
a method for automatically scanning and analyzing risks of an N-1 main transformer of a 110kV power grid comprises the following steps:
step S1: screening out an analyzed main transformer object from a database according to conditions;
step S2: according to the power flow direction, the equipment association relation and the switch disconnecting link real-time state, all 10kV buses which are currently supplied with power by a main transformer of an analysis object are obtained through topological analysis, and a corresponding table of the main transformer and the buses is stored in a system;
step S3: according to the power flow direction, the equipment association relation and the switch disconnecting link real-time state, carrying out topological analysis to obtain a bus where a main transformer of an analysis object currently runs a step-down switch, and storing a corresponding table of the main transformer and the bus in a system;
step S4: combining the buses analyzed in the step S2, and combining the two 10kV buses into a group when the two buses are connected only through a disconnecting link or a lead without a switch;
step S5: whether a bus currently powered by a main transformer of a topological analysis object meets main transformer spare power automatic switching conditions or not is judged directly, and the bus does not lose voltage after N-1 for meeting the conditions without subsequent analysis;
step S6: for the analysis object main transformer which does not meet the condition of the step S5, all buses supplied by the analysis object main transformer are inquired from the main transformer and bus corresponding table obtained in the step S2, and the buses are used as new analysis objects;
step S7: whether the buses obtained in the step S6 meet the sectional spare power automatic switching conditions or not is analyzed, for the combined buses obtained in the step S4, only any one section of the combined buses meeting the relevant conditions is analyzed, and for the combined buses not meeting the conditions, the combined buses are judged to be under-voltage after N-1;
step S8: classifying the object analyzed in the step S6 according to the related rules:
step S9: for the first type of bus analyzed in the step S8, the analysis result in the step S7 is adopted for each section of independent bus included in the first type of bus; for the second type of bus analyzed in the step S8, if any independent bus included in the second type of bus satisfies the segment spare power automatic switching condition, all the analysis results of other independent buses are corrected to satisfy the segment spare power automatic switching condition, and after the correction is completed, the analysis results are converted into the analysis results taking the main transformer as the object according to the main transformer and bus correspondence table obtained in the step S2;
step S10: and summarizing the analysis results analyzed in the step S5 and the step S9 to obtain the voltage loss and the spare power automatic switching operation conditions of all the main transformers N-1 to be analyzed, and forming a main transformer N-1 risk analysis report.
Preferably, the conditions for screening and analyzing the primary transformation object in step S1 are as follows: (1) the equipment attribute is a main transformer; (2) the voltage grade is 110 kV; (3) and no maintenance plate is hung. (4) And boosting and changing in a non-power plant.
Preferably, in step S5, the conditions for the main backup power automatic switching are as follows: (1) the bus can be topological to a hot standby low-voltage switch; (2) the variable-height switch of the main transformer where the variable-height switch is located is in an operation or hot standby state; (3) the main transformer is arranged in a main transformer spare power automatic switching maintenance table; (4) and the main transformer where the low-voltage switch is located and the main transformer of the analysis object are not the same.
Preferably, the classification rule of step S8 is: (1) an independent bus only corresponds to an equipment name and a serial number, or a parallel bus obtained by analyzing in the step S4 is of one type; (2) and a plurality of independent bus bars connected by the operated sectionalizing switch are another type.
Compared with the prior art, the invention has the beneficial effects that:
the method utilizes a computer system to rapidly and automatically analyze to obtain the risk report of the 110kV main transformer N-1, avoids the defect of manual calculation, has strong timeliness and high accuracy, greatly improves the working efficiency, reduces the time cost and the labor cost, and increases the running stability of the power grid.
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FIG. 1 is a flow chart of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
the invention is further illustrated below with reference to the figures and examples.
Example 1
A method for automatically scanning and analyzing risks of an N-1 main transformer of a 110kV power grid comprises the following steps:
step S1: screening out an analyzed main transformer object from a database according to conditions;
step S2: according to the power flow direction, the equipment association relation and the switch disconnecting link real-time state, all 10kV buses which are currently supplied with power by a main transformer of an analysis object are obtained through topological analysis, and a corresponding table of the main transformer and the buses is stored in a system;
step S3: according to the power flow direction, the equipment association relation and the switch disconnecting link real-time state, carrying out topological analysis to obtain a bus where a main transformer of an analysis object currently runs a step-down switch, and storing a corresponding table of the main transformer and the bus in a system;
step S4: combining the buses analyzed in the step S2, and combining the two 10kV buses into a group when the two buses are connected only through a disconnecting link or a lead without a switch;
step S5: whether a bus currently powered by a main transformer of a topological analysis object meets main transformer spare power automatic switching conditions or not is judged directly, and the bus does not lose voltage after N-1 for meeting the conditions without subsequent analysis;
step S6: for the analysis object main transformer which does not meet the condition of the step S5, all buses supplied by the analysis object main transformer are inquired from the main transformer and bus corresponding table obtained in the step S2, and the buses are used as new analysis objects;
step S7: whether the buses obtained in the step S6 meet the sectional spare power automatic switching conditions or not is analyzed, for the combined buses obtained in the step S4, only any one section of the combined buses meeting the relevant conditions is analyzed, and for the combined buses not meeting the conditions, the combined buses are judged to be under-voltage after N-1;
step S8: classifying the object analyzed in the step S6 according to the related rules:
step S9: for the first type of bus analyzed in the step S8, the analysis result in the step S7 is adopted for each section of independent bus included in the first type of bus; for the second type of bus analyzed in the step S8, if any independent bus included in the second type of bus satisfies the segment spare power automatic switching condition, all the analysis results of other independent buses are corrected to satisfy the segment spare power automatic switching condition, and after the correction is completed, the analysis results are converted into the analysis results taking the main transformer as the object according to the main transformer and bus correspondence table obtained in the step S2;
step S10: and summarizing the analysis results analyzed in the step S5 and the step S9 to obtain the voltage loss and the spare power automatic switching operation conditions of all the main transformers N-1 to be analyzed, and forming a main transformer N-1 risk analysis report.
Preferably, the conditions for screening and analyzing the primary transformation object in step S1 are as follows: (1) the equipment attribute is a main transformer; (2) the voltage grade is 110 kV; (3) and no maintenance plate is hung. (4) And boosting and changing in a non-power plant.
Preferably, in step S5, the conditions for the main backup power automatic switching are as follows: (1) the bus can be topological to a hot standby low-voltage switch; (2) the variable-height switch of the main transformer where the variable-height switch is located is in an operation or hot standby state; (3) the main transformer is arranged in a main transformer spare power automatic switching maintenance table; (4) and the main transformer where the low-voltage switch is located and the main transformer of the analysis object are not the same.
Preferably, the classification rule of step S8 is: (1) an independent bus only corresponds to an equipment name and a serial number, or a parallel bus obtained by analyzing in the step S4 is of one type; (2) and a plurality of independent bus bars connected by the operated sectionalizing switch are another type.
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 (4)
1. A method for automatically scanning and analyzing the risk of an N-1 main transformer of a 110kV power grid is characterized by comprising the following steps:
step S1: screening out an analysis object main transformer from a database according to conditions;
step S2: according to the power flow direction, the equipment association relation and the switch disconnecting link real-time state, all 10kV buses which are currently supplied with power by a main transformer of an analysis object are obtained through topological analysis, and a corresponding table of the main transformer and the buses is stored in a system;
step S3: according to the power flow direction, the equipment association relation and the switch disconnecting link real-time state, carrying out topological analysis to obtain a bus where a main transformer of an analysis object currently runs a step-down switch, and storing a corresponding table of the main transformer and the bus in a system;
step S4: combining the buses analyzed in the step S2, and combining the two 10kV buses into a group when the two buses are connected only through a disconnecting link or a lead without a switch;
step S5: whether a bus currently powered by a main transformer of a topological analysis object meets main transformer spare power automatic switching conditions or not is judged directly, and the bus does not lose voltage after N-1 for meeting the conditions without subsequent analysis;
step S6: for the analysis object main transformer which does not meet the condition of the step S5, all buses supplied by the analysis object main transformer are inquired from the main transformer and bus corresponding table obtained in the step S2, and the buses are used as new analysis objects;
step S7: whether the buses obtained in the step S6 meet the sectional spare power automatic switching conditions or not is analyzed, for the combined buses obtained in the step S4, only any one section of the combined buses meeting the relevant conditions is analyzed, and for the combined buses not meeting the conditions, the combined buses are judged to be under-voltage after N-1;
step S8: classifying the object analyzed in the step S6 according to the related rules:
step S9: for the first type of bus analyzed in the step S8, the analysis result in the step S7 is adopted for each section of independent bus included in the first type of bus; for the second type of bus analyzed in the step S8, if any independent bus included in the second type of bus satisfies the segment spare power automatic switching condition, all the analysis results of other independent buses are corrected to satisfy the segment spare power automatic switching condition, and after the correction is completed, the analysis results are converted into the analysis results taking the main transformer as the object according to the main transformer and bus correspondence table obtained in the step S2;
step S10: and summarizing the analysis results of the S5 and S9 to obtain the voltage loss and spare power automatic switching operation conditions of all the main transformers N-1 to be analyzed, and forming a main transformer N-1 risk analysis report.
2. The method for automatically scanning and analyzing the risk of the N-1 main transformer of the 110kV power grid according to claim 1, wherein the screening conditions in the step S1 are as follows: (1) the equipment attribute is a main transformer; (2) the voltage grade is 110 kV; (3) the maintenance plate is not hung; (4) and boosting and changing in a non-power plant.
3. The method for automatically scanning and analyzing the risk of the N-1 main transformer of the 110kV power grid according to claim 1, wherein the step S5 is performed according to the following main transformer spare power automatic switching conditions: (1) the bus can be topological to a hot standby low-voltage switch; (2) the main transformer of the hot standby low-voltage switch is in a running or hot standby state; (3) the main transformer where the hot standby low-voltage switch is located is in a main transformer spare power automatic switching maintenance table; (4) the main transformer where the hot standby low-voltage switch is located and the main transformer to be analyzed are not the same main transformer.
4. The method for automatically scanning and analyzing the risk of the main transformer N-1 of the 110kV power grid according to claim 1, wherein the classification rule of the step S8 is as follows: (1) an independent bus only corresponds to an equipment name and a serial number, or a parallel bus obtained by analyzing in the step S4 is of one type; (2) and a plurality of independent bus bars connected by the operated sectionalizing switch are another type.
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| CN110348597B (en) * | 2019-05-31 | 2022-02-11 | 广东电网有限责任公司 | Method for predicting short-term load curve of 110kV main transformer of power grid |
| CN113344364B (en) * | 2021-05-31 | 2022-12-23 | 广东电网有限责任公司佛山供电局 | Power failure plan risk analysis method and device, electronic equipment and storage medium |
| CN114678846B (en) * | 2022-03-22 | 2023-05-02 | 中国电力科学研究院有限公司 | N-x fast topology analysis method, system and readable storage medium |
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