CN110850199B - Power distribution network line heavy overload monitoring method - Google Patents
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention relates to a method for monitoring heavy overload of a power distribution network line. The PMS system derives the ledger information such as the current-carrying capacity, the length and the like of the feeder section; the ledger information is transmitted to a DMS system of the I-area production control large area through a GOMS interface and the III management information large area; analyzing and calculating feeder sections of all lines in the DMS system, analyzing and calculating real-time current-carrying capacity, and synthesizing rated current-carrying capacity, heavy overload duration time and a set proportion to obtain heavy-load and overload feeder sections; classifying the heavy overload feeder sections, and judging whether the heavy overload feeder sections belong to too small wire diameters or too large loads in a power supply range by combining the CT transformation ratio of an outlet switch in a substation; different modes are processed for different types of heavy load overload conditions; real-time visual warning and displaying of overload information of heavy load; and counting different dimensions of historical overload information. The invention can quickly inspect and monitor the heavily overloaded feeder line section, realizes the advanced analysis of the operation trend of the power distribution network, and provides a measure for actively adopting preventive regulation and control.
Description
Technical Field
The invention belongs to the field of power system automation, and particularly relates to a power distribution network line heavy overload monitoring method.
Background
In the actual operation process of the power distribution network, due to the fact that a special operation mode needs to be adopted for power grid maintenance or equipment failure, the power equipment can be in a heavy load or overload state for a long time in an unplanned operation mode. The abnormal operation mode can cause equipment aging and affect the service life, and if timely and effective measures are not taken, the condition is easy to worsen, and even large-area power failure can be caused. The DMS system only realizes the heavy overload monitoring of a feeder line and a distribution transformer in the aspect of line heavy overload monitoring, but lacks relatively fine technical means in the aspects of conductor sections and visual monitoring of branch lines, and besides, the DMS system researches and judges the application in the aspects of heavy fault sensing and positioning and lacks an auxiliary decision means for the whole process of fault isolation, load transfer and power restoration.
The method is quite necessary for rapidly inspecting and monitoring the heavy overload equipment in time, realizing the advanced analysis of the operation trend of the power distribution network, providing measures for actively adopting preventive regulation and control and finishing the heavy overload monitoring method of the power distribution network line.
Disclosure of Invention
The invention aims to provide a method for monitoring the heavy overload of a power distribution network line, which realizes the automatic study, judgment and processing of the heavy overload of a feeder section on the power distribution network line.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for monitoring heavy overload of a power distribution network line is characterized in that account information including current-carrying capacity and length of a feeder line section is exported by a PMS system; the ledger information is transmitted to a DMS system of the I-area production control large area through a GOMS interface and the III-area management information large area; analyzing and calculating feeder sections of all lines in the DMS system, analyzing and calculating real-time current-carrying capacity, and synthesizing rated current-carrying capacity, heavy overload duration time and a set proportion to obtain heavy-load and overload feeder sections; classifying the heavy overload feeder sections, and judging whether the heavy overload feeder sections belong to too small wire diameters or too large loads in a power supply range by combining the CT transformation ratio of an outlet switch in a substation; different types of overload conditions are processed in different modes, and real-time visual alarm and display of overload information and different dimensionality statistics of historical overload information are achieved.
In an embodiment of the present invention, the specific implementation manner of performing different types of processing on different types of heavy-load overload conditions is as follows: and initiating a defect flow when the diameter is too small, and optimizing an operation mode by adopting a power supply conversion mode when the load is too large.
In an embodiment of the invention, after receiving the feeder section ledger information, the DMS parses the XML format file, imports the ledger information into the DMS, analyzes and calculates feeder sections of all lines, analyzes and calculates real-time current-carrying capacity, and obtains the heavy-load and overloaded feeder sections by integrating rated current-carrying capacity, heavy overload duration, and a set proportion.
In an embodiment of the invention, the real-time visual warning and display of the overload information are realized by coloring the feeder line section and identifying the overload feeder line section on the single line diagram.
Compared with the prior art, the invention has the following beneficial effects:
1. the method realizes real-time alarm of the heavily overloaded feeder section on the line, and ensures that the line safely runs in a controllable and visible mode;
2. the method automatically studies and judges the overload fault of the feeder line section on the line, avoids manual intervention calculation and greatly saves manpower;
3. the method automatically calculates the power conversion scheme during heavy overload, greatly improves the safety of a power grid system, avoids further expansion of faults, and improves the economic benefit of the power grid;
4. the method is incorporated into the full flow system of the existing DMS system, and forms a closed loop for processing the heavy overload fault, thereby ensuring the thoroughness of heavy overload handling.
Detailed Description
The following specifically describes the technical means of the present invention.
The invention provides a method for monitoring heavy overload of a power distribution network line, which comprises the steps of leading out ledger information comprising the current-carrying capacity and the length of a feeder line section by a PMS (permanent magnet synchronous motor) system; the ledger information is transmitted to a DMS system of the I-area production control large area through a GOMS interface and the III-area management information large area; analyzing and calculating feeder sections of all lines in the DMS system, analyzing and calculating real-time current-carrying capacity, and synthesizing rated current-carrying capacity, heavy overload duration time and a set proportion to obtain heavy-load and overload feeder sections; classifying the heavy overload feeder sections, and judging whether the heavy overload feeder sections belong to too small wire diameters or too large loads in a power supply range by combining the CT transformation ratio of an outlet switch in a substation; different types of overload conditions are processed in different modes, and real-time visual alarm and display of overload information and different dimensionality statistics of historical overload information are achieved.
The method of the invention is concretely realized as follows:
1) and (4) exporting the ledger information such as the current-carrying capacity and the length of the feeder section by the PMS, and transmitting the ledger information to the DMS system of the I-region production control large region through the GOMS interface and the III management information large region.
2) And after receiving the feeder section account information, the DMS system analyzes and calculates feeder sections of all lines, analyzes and calculates real-time current-carrying capacity, and synthesizes rated current-carrying capacity, heavy overload duration time and a set proportion to obtain heavy-load and overload feeder sections.
a. The feeder segment overloading is specifically defined: by default, more than 80% is overloaded for 1 hour, and more than 100% is overloaded. The time and the proportion are configurable.
b. The current of the target feed-forward line segment cannot be directly acquired by a system, and needs to be calculated through measurement of a switch and a distribution transformer. Because the number of feeder sections of the power grid is too large, the current calculation of the feeder sections needs time, so that the current of the feeder sections cannot be monitored in real time, and the load condition of a line needs to be periodically calculated in a quasi-real time manner.
c. The line current value is obtained by measurement calculation, but at present, equipment possibly has no measurement or obvious wrong measurement, and the system eliminates the measurement, so that the accuracy of a calculation result is improved. The measurement with the measurement value more than 2.5 times the load limit of the equipment is defined as bad data by default.
3) And classifying the heavily overloaded feeder line sections obtained after analysis and calculation, and judging whether the heavily overloaded feeder line sections belong to too small line diameters or too large loads in a power supply range by combining the CT transformation ratio of the outgoing switch in the substation.
a. And (4) line heavy overload treatment, wherein in the analysis service, if the current carrying capacity of the heavily overloaded feeder section is less than 50% of the CT transformation ratio of the outgoing switch, the reason of the current line heavy overload is judged to be that the line diameter is too small, otherwise, the line heavy overload is judged to be distribution transformer heavy overload.
b. After the specific reasons are pushed to a man-machine interface of a DMS system for display, the heavy overload feeder section with the small wire diameter can directly initiate a defect flow on the display interface, and the feeder section with the heavy overload of the distribution transformer can release a corresponding scheme.
4) And (3) real-time visual alarm and display of the overload information, wherein the overload feeder line section is marked by coloring the feeder line section on the single line diagram.
5) And (4) counting historical heavy overload information, and analyzing according to different dimensions such as time, feeder lines, stations and the like.
The invention provides a method for monitoring the heavy overload of a power distribution network line, which is shown by practical application to be correct and effective, ensure the accuracy and timeliness of the heavy overload alarm of a feeder line section on a DMS system single line diagram and optimize the operation mode of a power grid.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (1)
1. A method for monitoring heavy overload of a power distribution network line is characterized in that ledger information including current-carrying capacity and length of a feeder line section is derived by a PMS system; the ledger information is transmitted to a DMS system of the I-area production control large area through a GOMS interface and the III-area management information large area; analyzing and calculating feeder sections of all lines in the DMS system, analyzing and calculating real-time current-carrying capacity, and synthesizing rated current-carrying capacity, heavy overload duration time and a set proportion to obtain heavy-load and overload feeder sections; classifying the heavy overload feeder sections, and judging whether the heavy overload feeder sections belong to too small wire diameters or too large loads in a power supply range by combining the CT transformation ratio of an outlet switch in a substation; if the current-carrying capacity of the heavily-overloaded feeder section is less than 50% of the CT transformation ratio of the outgoing switch, judging that the reason of the current line heavy overload is that the diameter of the feeder section is too small, otherwise, judging that the load in the power supply range of the transformer substation is too large; different types of overload conditions are processed in different modes, and real-time visual alarm and display of overload information and different dimensionality statistics of historical overload information are realized; the specific implementation mode for carrying out different modes of processing different types of heavy load overload conditions is as follows: initiating a defect flow when the diameter is too small, and adopting a power supply conversion mode when the load is too large to optimize the operation mode; after receiving the station account information of the feeder sections, the DMS system analyzes the XML format file, imports the station account information into the DMS system, analyzes and calculates the feeder sections of all lines, analyzes and calculates the real-time current-carrying capacity, and synthesizes the rated current-carrying capacity, the heavy overload duration time and the set proportion to obtain the heavy-load feeder sections and the overloaded feeder sections; the real-time visual alarm and display of the overload information are realized by coloring the feeder line section on the single line diagram to identify the overload feeder line section.
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| CN201911028246.9A CN110850199B (en) | 2019-10-28 | 2019-10-28 | Power distribution network line heavy overload monitoring method |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111308168B (en) * | 2020-03-31 | 2022-03-22 | 广东电网有限责任公司 | Method, device and equipment for automatically generating line current limiting value |
| CN112234603B (en) * | 2020-09-08 | 2023-01-24 | 广东电网有限责任公司江门供电局 | Heavy overload checking method for open-loop power grid load transfer decision |
| CN112615754A (en) * | 2021-01-06 | 2021-04-06 | 章伟 | Network fluctuation safety processing method and device based on big data |
| CN114944654B (en) * | 2022-07-13 | 2022-12-30 | 广东电网有限责任公司佛山供电局 | Method and system for analyzing real heavy load overload of line of photovoltaic access distribution network |
| CN116151509A (en) * | 2023-02-13 | 2023-05-23 | 国家电投集团数字科技有限公司 | Power information management method and system based on data fusion |
| CN116154772B (en) * | 2023-04-23 | 2023-07-04 | 广东电网有限责任公司佛山供电局 | Distribution network line current-carrying capacity rationality automatic analysis method, device and equipment |
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