Method for Detecting Exceedance of the Limiting Transmission Capacity of Distribution Network Lines Based on the PMS System

Abstract

The present invention discloses a method for detecting over-standard of the limit transmission capacity of distribution network lines based on the PMS system, which relates to the technical field of operation and maintenance detection of distribution network lines. Based on summarizing various current wiring methods of distribution lines, the present invention forms an automatic layout algorithm for different wiring methods, uses the topological relationship recursion technology to infer the load capacity carried on each wire from the end to the head of the distribution network, determines whether the distribution network line exceeds the standard through the wire limit transmission capacity algorithm, and automatically outputs the summary result of the over-standard lines, providing a reference basis for the economic operation analysis of the distribution network. The present invention proposes a new detection technology in the early design and planning stage and economic operation of the distribution network, which can assist distribution network operators to quickly and accurately locate the currently potential over-standard wires with limit transmission capacity from the intricate distribution network system, providing technical support for subsequent economic operation analysis and energy-saving and loss-reduction transformation of the distribution network.

Description

Technical Field

[0001] The invention belongs to the technical field of distribution network line operation and maintenance detection, and in particular relates to a distribution network line limit transmission capacity exceeding detection method based on a PMS system. Background Art

[0002] In the current power system, the distribution network has a complex structure, high line loss, poor reliability, and a large space for improving line loss. At present, the State Grid has proposed to build a strong, reliable, economical, efficient, clean, environmentally friendly, transparent, open, friendly and mutually beneficial modern power grid. However, there are still the following problems: unreasonable power grid structure, low level of line loss management, and insufficient level of informatization.

[0003] Combining the above points, with the diversity of current conductor products, each product has different advantages and disadvantages. We need to comprehensively consider the transmission capacity, line operation mode and line environment factors, propose a distribution line limit transmission capacity exceeding detection technology, and then select economical and applicable conductors according to the suggestions to solve the above problems;

[0004] At present, the power grid loss reduction software in some areas has realized the function of analyzing and detecting high-loss lines in the distribution network. The technical implementation method is: first, the power grid modeling of the evaluation and analysis target is carried out, the distribution network wiring diagram is drawn, and the distribution network equipment parameters are input. Then, according to the measured data collected by the power grid monitoring equipment, such as active power, reactive power, voltage, current, etc., the theoretical line loss is calculated to determine the theoretical loss data of the distribution network line. Finally, the energy efficiency of the power grid is evaluated according to the power grid energy efficiency standard data, and loss reduction transformation suggestions are automatically given to evaluate how much loss can be reduced after the power grid transformation, and the transformation cost recovery period is evaluated.

[0005] The loss reduction auxiliary decision-making function of the power grid loss reduction and energy-saving technology in the above-mentioned prior art provides a certain method for the operation and maintenance transformation of high-loss lines, but there are still problems such as insufficient comprehensive judgment of lines in different operating modes, single transformation analysis method, and large workload. Therefore, it is a problem worth studying to continue to improve the existing power grid loss reduction and energy-saving technology to make it more perfect. Summary of the invention

[0006] The purpose of the present invention is to provide a method for detecting excessive transmission capacity of distribution network lines based on a PMS system. Based on the CIM specification in the IEC61970 standard, the CIM model file in the PMS system is read and parsed through an interface to automatically generate an intuitive electrical wiring diagram. According to the forward recursive algorithm of the line topology relationship, and in combination with the wire limit transmission capacity algorithm, it is determined whether the line exceeds the limit capacity, and the excessive wires are automatically summarized and output. By calculating and evaluating the wire limit transmission capacity, the high-loss line of the distribution network is quickly located, solving the existing problems.

[0007] The current distribution line loss reduction technology only calculates the high-loss conductors that affect the distribution network loss. There is no document publicly reporting a technology that comprehensively develops a technology for quickly locating high-loss lines based on the mismatch between the load capacity carried by the conductor and the conductor's limit transmission capacity from the dimension of the distribution network line's limit transmission capacity. To solve the above technical problems, the present invention is implemented through the following technical solutions:

[0008] The present invention is a method for detecting excessive transmission capacity of a distribution network line based on a PMS system, comprising the following steps:

[0009] Step S001: Obtain data from the PMS system: obtain the topological model and parameter data of the PMS and GIS source systems through a standard data interface;

[0010] Step S002: Analyze data to generate graphics: According to the interconnection relationship between the topology model and parameter data in the CIM data file and the standard power wiring method, the distribution network line topology relationship is automatically generated according to different layout algorithms; based on the summary of various current distribution line wiring methods, the automatic layout algorithms of different wiring methods are formed: including typical data required for calculation: 1) wire model 2) wire cross-sectional area 3) transformer capacity 4) wiring topology connection relationship;

[0011] Step S003: Calculate the topology from the end to the head end: Based on the topological relationship of the distribution network line, calculate from the end of the line to the head end, calculate the load capacity of each line, and calculate whether the load carried by the conductor exceeds the standard according to the conductor limit capacity method, and quickly and accurately locate the position where the baseline transmission capacity exceeds the standard;

[0012] Step S004: Output summary results: summarize and output the distribution network lines that exceed the limit capacity to provide a reference for the economic operation analysis of the distribution network;

[0013] The present invention starts from the aspects of the conductor material, the limit transmission capacity, the distribution transformer capacity, etc., and judges whether the limit transmission capacity of the conductor exceeds the standard step by step according to the topological recursive algorithm, and timely marks and summarizes the conductor segments that exceed the standard, and feeds back to relevant personnel for analysis. In other words, the present invention can more flexibly solve the more complex distribution network conductor loss analysis and energy-saving problems. Informatization not only avoids frequent errors in human analysis and decision-making, but also relieves technicians from the heavy data sorting and analysis work, improves work efficiency and accuracy of results, and provides a reference basis for the early planning of distribution network and loss reduction and energy saving work of power supply enterprises, so that the construction of distribution network is targeted and the investment benefits are more significant.

[0014] Furthermore, a topology diagram is drawn according to the generated line topology relationship. The specific method is as follows:

[0015] According to the graphic symbols corresponding to different device types, Adobe Flex Graphics Development Kit (Flex SDK) is used to automatically render them into vector graphics, that is, standard power component devices displayed in the graphical user interface;

[0016] Generate the topological connection relationship of the devices and draw a topological structure diagram.

[0017] Furthermore, the calculation method of the load carried by the wire is:

[0018] Calculate the load on the conductor using the conductor limit capacity method:

[0019]

[0020] Among them, U is the rated voltage, I is the continuous allowable current of the conductor, and cosφ is the power factor.

[0021] Furthermore, the steps of performing topological recursion based on the topological relationship of the distribution network line and judging whether the load carried by the conductor exceeds the standard are as follows:

[0022] S1: Recursively deduce the topological relationship from the end of the line to the beginning, and calculate the load capacity of each line;

[0023] S2: Determine whether the limit transmission capacity of the line itself is exceeded according to the wire limit transmission capacity algorithm. If it is not exceeded, proceed recursively; if it is exceeded, store the relevant information of the wire exceeding the limit;

[0024] S3: Determine whether the recursion reaches the line head end. If so, store the relevant information. Otherwise, continue to calculate the topological relationship for judgment.

[0025] S4: Output the summary report of the conductors that exceed the standard.

[0026] Furthermore, the method for obtaining the distribution line segment information and the capacity information of the connected distribution transformer is:

[0027] Step R001: perform group data operation according to the current distribution network line information: obtain all components and distribution network line topology relationships, establish model relationships, and assemble into corresponding data structures;

[0028] Step R002: Calculate the capacity of the distribution transformer connected to the conductor according to the data information of the distribution network line group;

[0029] Step R003: Obtain the distribution network line information and the corresponding connected distribution transformer capacity information recorded in step R002, and save them in the database table. The calculation is completed.

[0030] Furthermore, in step R001, the method of group data operation is:

[0031] Query basic information: query the basic data of equipment involved in the distribution network, including outgoing lines, switchgear, capacitors, wiring sections, power supplies, switches, distribution transformers, etc.;

[0032] Query topology connection information: query the device connection information involved in the distribution network line, including device endpoint information and connection point information;

[0033] Query dictionary table information: Query the dictionary table information of the equipment involved in the distribution network line. The equipment dictionary table information includes voltage level, conductor model, distribution transformer model, etc.

[0034] Establish relationships: Establish model relationships based on all queried components and topological connection relationships, and assemble them into corresponding data structures.

[0035] Furthermore, in step R002, the capacity calculation method of the distribution transformer connected to the conductor is:

[0036] Step D001: Determine whether there is a distribution transformer under the distribution network line. If there is no distribution transformer, no calculation is required, otherwise proceed to step D002;

[0037] Step D002: loop through the existing distribution transformers to obtain the capacity and endpoint information of the distribution transformers and the connection point information of the endpoints;

[0038] Step D003: Determine the device connected to the distribution transformer through the endpoints and connection points. If the device is not an outlet switch, first determine whether the device can be connected to the outlet switch through one-way traversal;

[0039] Step D004: if the device in step D003 can be connected to the outgoing switch through one-way traversal, determine whether the device is a distribution line segment; if it cannot be connected to the outgoing switch through one-way traversal, do not process it;

[0040] Step D005: If the device is determined to be a distribution line segment in step D004, the information of the distribution line segment is recorded, and the capacity of the distribution transformer obtained in step D002 is added to the capacity of the access distribution transformer of the distribution line segment;

[0041] Step D006: If step D004 determines that the device is not a distribution line segment, then obtain the endpoint information of the device and the connection point information of the device endpoint; continue to loop through steps D003, D004, and D005 until the acquired device is an outlet switch, and then end the loop;

[0042] Step D007: During the loop execution, record the devices that have been processed to avoid duplication;

[0043] Step D008: After the cycle of one distribution transformer is completed, continue to search for the next distribution transformer, and continue the cycle execution of steps D003 to D007 until the cycle of all distribution transformers is completed.

[0044] Furthermore, the detection method is based on the CIM specification in the IEC61970 standard.

[0045] The present invention has the following beneficial effects:

[0046] The distribution network line capacity exceeding standard detection technology provided by the present invention greatly improves the efficiency of checking the exceeding standard of the conductor capacity, and avoids the phenomenon that the traditional human beings cannot quickly and reasonably check the exceeding standard conductor in the complex distribution network.

[0047] The present invention can provide more angles and deeper analysis methods for comprehensive analysis of line losses and economic operation of distribution networks, thereby providing strong data support for improving the technical level of distribution network operation and maintenance management; the present invention starts from the wire material, limit transmission capacity, distribution transformer capacity and other aspects of the distribution line, and judges whether the limit transmission capacity of the wire exceeds the standard step by step according to the topological recursive algorithm, and timely marks and summarizes the wire segments that exceed the standard, and feeds back to relevant personnel for auxiliary analysis, thereby improving the flexibility, accuracy and timeliness of the economic operation analysis of the distribution network.

[0048] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0050] Figure 1 It is a flow chart of a method for detecting excessive transmission capacity of a distribution network line based on a PMS system of the present invention;

[0051] Figure 2 This is a flow chart of the distribution network topology recursion and the judgment of exceeding the limit capacity of the conductor in the present invention;

[0052] Figure 3 This is a flow chart of the recursive algorithm for the distribution network topology model of the present invention;

[0053] Figure 4 Specific recursive demonstration for detection of exceeding the limit transmission capacity Figure 1 ;

[0054] Figure 5Specific recursive demonstration for detection of exceeding the limit transmission capacity Figure 2 ;

[0055] Figure 6 In the embodiment of the present invention, a company automatically generates a power distribution line diagram;

[0056] Figure 7 This is a report diagram of the output result of the detection of exceeding the limit transmission capacity in an embodiment of the present invention;

[0057] Figure 8 In the embodiment of the present invention, the first conductor segment with excessive transmission capacity in the limit in the model is located;

[0058] Fig. 9 In the embodiment of the present invention, the second conductor segment with excessive limit transmission capacity in the model is located. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] In the description of the present invention, it should be understood that the terms "end", "front", "rear" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0061] Embodiment 1:

[0062] See also Figure 1-3 As shown, the present invention is a method for detecting excessive transmission capacity of a distribution network line based on a PMS system, which involves distribution network line operation and maintenance detection, distribution network high-loss line analysis and loss reduction, etc., and includes the following steps:

[0063] Step S001: Obtain data from the PMS system: Obtain the topological model and parameter data of the PMS and GIS source systems through standard data interface methods. The parameter data includes wire length, wire model, wire cross-sectional area, connection information, coordinate value, number, distribution transformer model capacity, etc.;

[0064] Step S002: Analyze data to generate graphics: According to the interconnection relationship between the topology model and parameter data in the CIM data file and the standard power wiring method, coordinate positions are automatically allocated and the topological relationship of the distribution network line is generated according to different layout algorithms; as an embodiment provided by the present invention, preferably, a topological structure diagram is drawn according to the generated line topological relationship, and the specific method is as follows:

[0065] According to the graphic symbols corresponding to different device types, Adobe Flex Graphics Development Kit (Flex SDK) is used to automatically render them into vector graphics, that is, standard power component devices displayed in the graphical user interface;

[0066] Generate the topological connection relationship of the equipment and draw a topological structure diagram;

[0067] Step S003: Calculate the topology from the end to the head end: Based on the distribution network line topology diagram, calculate from the line end to the head end, calculate the load capacity of each line, and calculate whether the load carried by the wire exceeds the standard according to the wire limit capacity method; as an embodiment provided by the present invention, preferably, the calculation method of the load carried by the wire is:

[0068] Calculate the load on the conductor using the conductor limit capacity method:

[0069]

[0070] Among them, U is the rated voltage, I is the continuous allowable current of the conductor, and cosφ is the power factor;

[0071] Step S004: Output summary results: Summarize and output the distribution network lines that exceed the limit capacity; specifically, for the conductors that exceed the limit capacity, the conductor model, length, location, limit capacity and load, transformer carried by the conductor and other information will be stored and summarized to form a report and output the report, which is suitable for early wiring planning and design and detection of in-service lines.

[0072] like Figure 2 As shown, as an embodiment provided by the present invention, preferably, the steps of performing topological recursion based on the topological relationship of the distribution network line and judging whether the load carried by the conductor exceeds the standard are:

[0073] S1: Recursively deduce the topological relationship from the end of the line to the beginning, and calculate the load capacity of each line;

[0074] S2: Determine whether the limit transmission capacity of the line itself is exceeded according to the wire limit transmission capacity algorithm. If it is not exceeded, proceed recursively; if it is exceeded, store the relevant information of the wire exceeding the limit;

[0075] S3: Determine whether the recursion reaches the line head end. If so, store the relevant information. Otherwise, continue to calculate the topological relationship for judgment.

[0076] S4: Output the summary report of the conductors that exceed the standard.

[0077] like Figure 3 As shown, as an embodiment provided by the present invention, preferably, the method for obtaining the distribution line segment information and the access distribution transformer capacity information is:

[0078] Step R001: perform group data operation according to the current distribution network line information: obtain all components and distribution network line topology relationships, establish model relationships, and assemble into corresponding data structures; as an embodiment provided by the present invention, preferably, the group data operation method is:

[0079] Query basic information: query the basic data of equipment involved in the distribution network, including outgoing lines, switchgear, capacitors, wiring sections, power supplies, switches, distribution transformers, etc.;

[0080] Query topology connection information: query the device connection information involved in the distribution network line, including device endpoint information and connection point information;

[0081] Query dictionary table information: Query the dictionary table information of the equipment involved in the distribution network line. The equipment dictionary table information includes voltage level, conductor model, distribution transformer model, etc.

[0082] Establish relationships: Establish model relationships based on all queried components and topological connection relationships, and assemble them into corresponding data structures;

[0083] Step R002: Calculate the capacity of the wire-access distribution transformer according to the data information of the distribution network line group; as an embodiment provided by the present invention, preferably, the method for calculating the capacity of the wire-access distribution transformer is:

[0084] Step D001: Determine whether there is a distribution transformer under the distribution network line. If there is no distribution transformer, no calculation is required, otherwise proceed to step D002;

[0085] Step D002: loop through the existing distribution transformers to obtain the capacity and endpoint information of the distribution transformers and the connection point information of the endpoints;

[0086] Step D003: Determine the device connected to the distribution transformer through the endpoints and connection points. If the device is not an outlet switch, first determine whether the device can be connected to the outlet switch through one-way traversal;

[0087] Step D004: if the device in step D003 can be connected to the outgoing switch through one-way traversal, determine whether the device is a distribution line segment; if it cannot be connected to the outgoing switch through one-way traversal, do not process it;

[0088] Step D005: If the device is determined to be a distribution line segment in step D004, the information of the distribution line segment is recorded, and the capacity of the distribution transformer obtained in step D002 is added to the capacity of the access distribution transformer of the distribution line segment;

[0089] Step D006: If step D004 determines that the device is not a distribution line segment, then obtain the endpoint information of the device and the connection point information of the device endpoint; continue to loop through steps D003, D004, and D005 until the acquired device is an outlet switch, and then end the loop;

[0090] Step D007: During the loop execution, record the devices that have been processed to avoid duplication;

[0091] Step D008: After the cycle of one distribution transformer is completed, continue to search for the next distribution transformer, and continue the cycle execution of steps D003 to D007 until the cycle of all distribution transformers is completed;

[0092] Step R003: Obtain the distribution network line information and the corresponding connected distribution transformer capacity information recorded in step R002, and save them in the database table. The calculation is completed.

[0093] As an embodiment provided by the present invention, preferably, the detection method is based on the CIM specification in the IEC61970 standard.

[0094] The invention provides a method for detecting excessive transmission capacity of distribution network lines based on the PMS system, and a technology for detecting excessive transmission capacity of distribution network lines, which greatly improves the efficiency of checking excessive transmission capacity of conductors, and avoids the phenomenon that it is difficult to quickly and reasonably check excessive conductors in the traditional complex distribution network. The invention can provide more angles and deeper analysis methods for comprehensive analysis of line losses and economic operation of distribution networks, and thus provide strong data support for improving the technical level of distribution network operation and maintenance management. The invention starts from the conductor material, extreme transmission capacity, distribution transformer capacity and other aspects of the distribution line, and judges whether the extreme transmission capacity of the conductor exceeds the standard step by step according to the topological recursive algorithm, and timely marks and summarizes the excessive conductor segments, and outputs them, and feeds them back to relevant personnel for auxiliary analysis, thereby improving the flexibility, accuracy and timeliness of economic operation analysis of distribution networks.

[0095] Embodiment 2:

[0096] Please see attached Figure 4, the present invention is further described for single-line power supply:

[0097] (1) Figure 4 Automatically generate distribution network model diagram (topology diagram) to parse CIM data files extracted from PMS system;

[0098] (2) Calculate the topological relationship from the end of the model to the beginning. First, calculate the load capacity of the EF line. Then, use the line limit transmission capacity algorithm to determine whether it exceeds the limit transmission capacity of the EF conductor.

[0099] (3) The load capacity of the wire is transformer 3 + transformer 4 + transformer 5. Determine whether the limit transmission capacity of the wire is greater than the load capacity.

[0100] (4) If switch 1 is disconnected, the load on line de is transformer 3, and it is determined whether transformer 3 exceeds the limit transmission capacity of line de;

[0101] (5) Similarly, the topological relationship is deduced from the end to the head end. The load carried by the bd line is transformer 2 + transformer 3 + transformer 4 + transformer 5. The maximum transmission capacity that the bd line needs to bear is deduced;

[0102] (6) Until the line head end ab line is calculated, the topological relationship is calculated to determine whether the line head end is calculated. If the line head end is calculated, the forward calculation is stopped; if the line head end is not calculated, the forward calculation is continued;

[0103] (7) After the calculation is completed, the summary results of the conductors exceeding the standard are output, including the conductor length, model, location, limit capacity and load details.

[0104] Embodiment three:

[0105] Combined with Figure 5 , the present invention is further described with respect to multi-line power supply:

[0106] (1) Figure 5 Automatically generate distribution network model diagrams for parsing CIM data files extracted from PMS systems;

[0107] (2) Calculate the topological relationship from the end of the model to the beginning. First, if switches 1 and 2 are closed and switch 3 is open (switches 1 to 3 from left to right in the figure), calculate the load capacity of the 1m line as transformer 4. Then, determine whether the limit transmission capacity of the 1m conductor is exceeded according to the line limit transmission capacity algorithm.

[0108] (3) The load capacity of the hi conductor is transformer 3 + transformer 4 + transformer 5 + transformer 6. Determine whether the hi conductor's maximum transmission capacity is greater than the load capacity.

[0109] (4) Similarly, the topological relationship is deduced from the end of lm to the head end. The load carried by the bc line is transformer 1 + transformer 2 + transformer 3 + transformer 4 + transformer 5 + transformer 6. The maximum transmission capacity that the bc line needs to bear is deduced;

[0110] (5) Until the line head end ab is calculated, the topological relationship is calculated to determine whether the line head end is calculated. If the line head end is calculated, the calculation is stopped. If the line head end is not calculated, the calculation is continued. The maximum transmission capacity that each section of the wire can bear is recorded in the system (result ①);

[0111] (6) If switch 1 is open and switch 2 and switch 3 are closed, then the ab conductor is the end. Re-arrange the ab conductor to the mn conductor and calculate the maximum transmission capacity that each conductor can bear and record it in the system (result ②).

[0112] (7) Finally, if switch 1 and switch 3 are closed and switch 2 is open, the line is divided into two sections. The maximum transmission capacity that each section of the conductor can bear is calculated from the position of switch 2 to the positions of the substations on both sides and recorded in the system (result ③);

[0113] (8) Comprehensive results ①②③, take the maximum value of each wire segment is the final calculation result;

[0114] (9) After the calculation is completed, the summary results of the conductors exceeding the standard are output, including the conductor length, model, location, limit capacity and load details.

[0115] Embodiment 4:

[0116] (1) Attachment Figure 6 As shown in the figure, a certain line of a certain city company first extracts the CIM data file from the PMS system and automatically generates a distribution network model diagram;

[0117] (2) Calculate using the conductor limit transmission capacity algorithm, and infer the capacity of the distribution transformer connected to each conductor from the end of the line until the beginning of the line, and generate a comparison report between the conductor limit transmission capacity and the distribution transformer capacity. When the distribution transformer capacity connected to a certain conductor segment is greater than the limit transmission capacity of the conductor segment, the font of the result corresponding to the conductor segment is highlighted ( Figure 7 The two light-colored lines in the middle) can be selected and positioned in the graphic, as shown in the attached Figure 7 As shown;

[0118] (3) Attachment Figure 7 As shown in the figure, the transformer capacity of the conductors named 5741134-1 and 5657853-1 is greater than the limit transmission capacity of the conductor. Double-click the red alarm column to quickly locate the problem conductor in the figure, as shown in the above attachment. Figure 8Locate the conductor segment with excessive transmission capacity in the model. Fig. 9 Locate the second conductor segment in the model where the maximum transmission capacity exceeds the standard.

[0119] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0120] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for detecting over - standard of the limit transmission capacity of distribution network lines based on the PMS system, characterized in that, it includes the following steps: Step S001: Obtain data from the PMS system: Through the standard data interface method, obtain the topological models and parameter data of the PMS and GIS source systems; Step S002: Parse the data to generate a graph: According to the inter - connection relationship of the topological model and parameter data in the CIM data file and the standard power connection method, automatically generate the topological relationship of the distribution network lines according to different layout algorithms; Step S003: Deduce the topology from the end to the head: Based on the topological relationship of the distribution network lines, deduce from the line end to the head, calculate the load capacity carried by each line, and calculate whether the load carried by the conductor exceeds the standard according to the conductor limit capacity method; The steps for judging whether the load carried by the conductor exceeds the standard are: S1: Deduce the topological relationship recursively from the line end to the head in sequence, and calculate the load capacity carried by each line; S2: Judge whether it exceeds the limit transmission capacity of the line itself according to the conductor limit transmission capacity algorithm. If it does not exceed the standard, recursively move forward; If it exceeds the standard, store the relevant information of the over - standard conductor; S3: Judge whether it has been deduced to the line head. If it has been deduced to the line head, store the relevant information. Otherwise, continue to deduce the topological relationship for judgment; S4: Output a summary report of the over - standard conductors; Step S004: Output the summary result: Summarize and output the distribution network lines that exceed the limit capacity.

2. The method for detecting over - standard of the limit transmission capacity of distribution network lines based on the PMS system according to claim 1, characterized in that, it further includes drawing a topological structure diagram according to the generated line topological relationship. The specific method is: According to the graphic symbols corresponding to different equipment types, use the Adobe Flex drawing development package to automatically render into vector graphics, that is, the standard power component equipment displayed in the graphical user interface; Generate the topological connection relationship of the equipment to draw the topological structure diagram.

3. The method for detecting over - standard of the limit transmission capacity of distribution network lines based on the PMS system according to claim 1, characterized in that, the calculation method of the load carried by the conductor is: Calculate the load carried by the conductor using the conductor limit capacity method: where U is the rated voltage, I is the continuous allowable current of the conductor, and cosφ is the power factor.

4. The method for detecting over - standard of the limit transmission capacity of distribution network lines based on the PMS system according to claim 1, characterized in that, it further includes: The method for obtaining the distribution line segment information and the capacity information of the connected distribution transformer is: Step R001: Perform group data operation according to the current distribution network line information: Obtain all components and the topological relationship of the distribution network lines, establish a model relationship, and assemble them into the corresponding data structure; Step R002: Calculate the capacity of the distribution transformer connected to the conductor according to the distribution network line group data information; Step R003: Obtain the distribution network line information recorded in Step R002 and the corresponding capacity information of the connected distribution transformer, and save them in the database table, and the calculation ends.

5. The method for detecting over - standard of the limit transmission capacity of distribution network lines based on the PMS system according to claim 4, characterized in that, In the step R001, the method of group data operation is as follows: Query basic information: Query the basic data of the equipment involved in the distribution network line; Query topological connection information: Query the connection information of the equipment involved in the distribution network line; Query dictionary table information: Query the dictionary table information of the equipment involved in the distribution network line; Establish relationships: Establish model relationships according to all the components and topological connection relationships queried, and assemble them into corresponding data structures.

6. The method for detecting the over - standard of the limit transmission capacity of the distribution network line based on the PMS system according to claim 4, characterized in that, In the step R002, the method for calculating the capacity of the conductor connected to the distribution transformer is as follows: Step D001: Determine whether there is a distribution transformer under the distribution network line. If there is no distribution transformer, there is no need to calculate. Otherwise, proceed to step D002; Step D002: Traverse the existing distribution transformers in a loop to obtain the capacity, endpoint information, and connection point information of the endpoints of the distribution transformers; Step D003: Determine the equipment connected to the distribution transformer through the endpoints and connection points. If the equipment is not an outgoing line switch, first determine whether the equipment can be connected to the outgoing line switch through one - way traversal; Step D004: If the equipment in step D003 can be connected to the outgoing line switch through one - way traversal, determine whether the equipment is a distribution line segment. If it cannot be connected to the outgoing line switch through one - way traversal, no processing is performed; Step D005: If it is determined in step D004 that the equipment is a distribution line segment, record the information of the distribution line segment, and add the capacity of the distribution transformer obtained in step D002 to the capacity of the distribution transformer connected to this distribution line segment; Step D006: If it is determined in step D004 that the equipment is not a distribution line segment, obtain the endpoint information of the equipment and the connection point information of the equipment endpoints; Continue to loop and execute step D003, step D004, and step D005 until the obtained equipment is an outgoing line switch, and end the loop; Step D007: During the loop execution, record the equipment that has been processed to avoid duplication; Step D008: After the loop of one distribution transformer ends, continue to search for the next distribution transformer and continue the loop execution of steps D003 - D007 until the loops of all distribution transformers end.

7. The method for detecting the over - standard of the limit transmission capacity of the distribution network line based on the PMS system according to any one of claims 1 - 6, characterized in that, The detection method is based on the CIM specification in the IEC61970 standard.

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