A method and system for drawing a K-line diagram of a transformer DC component

Abstract

A method for drawing a DC component K-line chart of a transformer includes: S100. acquiring DC component monitoring data of the transformer; S200. determining the start and end times of the DC component based on the DC component monitoring data; S300. drawing a K-line chart of the DC component based on the start and end times of the DC component and the positive and negative characteristics of the DC component. This method for drawing a DC component K-line chart provides a way to remotely transmit the acquired frequency bands to the acquisition device, acquire monitoring data in each frequency band, and obtain the optimal monitoring frequency through comprehensive analysis of the monitoring data in each frequency band. This solves the problems of limited communication channels and large data transmission volume across the entire frequency band, ensuring the effectiveness of vibration signal monitoring data.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit stray current, and in particular to a method and system for drawing a transformer DC component K-line diagram. Background Art

[0002] The single-pole operation of ultra-high and extra-high voltage DC projects, urban rail transit operation, photovoltaic, wind power, DC distribution networks, etc. will all generate DC components. The DC components flow in urban pipe corridors, energy pipe corridors and power grids, and flow into transformers, causing DC magnetic bias in transformers and transformer vibration, which not only shortens the life of transformers and endangers the safety of large power grid operations, but also causes noise disturbances, leading to complaints from nearby residents and affecting the social image of power grid companies.

[0003] The Chinese invention patent "K-line graph drawing method and device" with application number "201710960852.9" uses unit cost as the horizontal axis and quotation as the vertical axis. When the market quotation fluctuation reaches 1 unit cost space, a K-line corresponding to the fluctuation trend is drawn. The horizontal axis unit and the vertical axis unit are both currency, which unifies the units of the horizontal and vertical axes of traditional analysis charts; the Chinese invention patent "A K-line graph drawing method, electronic equipment and storage medium" with application number "201711495044.6" proposes a K-line graph drawing method. According to The obtained K-line data calculates the K-line vertex coordinates; texture mapping is performed on the vertex coordinates to obtain vertex data; the vertex data is rasterized; the rasterized vertex data is written into a buffer; the data in the buffer is read, and a K-line graph is drawn according to the data in the buffer; the above two invention patents both utilize the basic idea of ​​the K-line graph, combined with specific business scenarios, to draw a K-line graph suitable for personalized scenarios, however, the above method is not disclosed for drawing the DC component K-line graph of the transformer, therefore, a method for drawing the DC component K-line graph of the transformer is urgently needed to solve this problem. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide a method and system for drawing a transformer DC component K-line diagram that overcomes the above problems or at least partially solves the above problems.

[0005] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention discloses a method for drawing a transformer DC component K-line diagram, comprising:

[0007] S100. Obtain transformer DC component monitoring data;

[0008] S200. Determine the start time and end time of the DC component according to the transformer DC component monitoring data;

[0009] S300. Draw a K-line graph of the DC component according to the start time and end time of the DC component and in combination with the positive and negative characteristics of the DC component.

[0010] Further, in S100, transformer DC component monitoring data is obtained, and the data is recorded as:

[0011]

[0012] Among them, ZL j,i is the DC component data of the j-th substation at the i-th monitoring point, where 1≤i≤n, 1≤j≤m, the data of the DC component monitoring point is one monitoring data per second, and the i-th monitoring point corresponds to the monitoring data at time i.

[0013] Furthermore, in S200, the start time and the end time of the DC component are determined according to the transformer DC component monitoring data, and the specific method includes:

[0014] S201. Determine the background period of the DC component, and obtain the mean value and standard deviation of the DC component of the background period;

[0015] S202. Calculate the start time and end time of the DC component according to the average value and standard deviation of the DC component.

[0016] Further, in S201, a background period of the DC component is determined, the background period is [t1, t2], and the background period satisfies the following conditions:

[0017]

[0018] The average value of the DC component during the background period is The standard deviation of the DC component is

[0019] Among them, t1 and t2 are the start and end times of the background period, ZL i is the DC component data of the substation at the i-th monitoring point, and YZ1 and YZ2 are the first preset time threshold and the second preset time threshold respectively.

[0020] Further, according to the average value and standard deviation of the DC component, the start time and the end time of the DC component are calculated, and the specific method includes:

[0021] Calculate the starting time of the DC component. For a certain time t3, if and Then the time t3 is the starting time of the DC component, where t3>t2;

[0022] Calculate the end time of the DC component. For a certain time t4, if and Then the time t4 is the end time of the DC component, where t4>t1.

[0023] Further, in S300, according to the start time and the end time of the DC component, combined with the positive and negative characteristics of the DC component, a K-line graph of the DC component is drawn, and the DC component K-line graph includes a morning peak K-line graph and an evening peak K-line graph; wherein the method for drawing the morning peak K-line graph includes:

[0024] The maximum value ZZL of the DC component in the statistical time interval [t3, t5] max , the minimum value of the DC component is ZZL min ; Among them, t3 is the starting time of the DC component, and the corresponding DC component is the starting DC component ZZL of the morning peak t3 , t5 is the end time of the morning peak, and the corresponding DC component value is the DC component ZZL at the end of the morning peak t5 ; by ZZL t3 , ZZL t5 , ZZL min , ZZL max These 4 values ​​are used to draw the morning peak candlestick chart, where ZZL t3 and ZZL t5 Used to draw a bar chart, ZZL min and ZZL max Used to draw lines.

[0025] Furthermore, the evening peak K-line graph drawing method includes: calculating the maximum value WZL of the DC component in the time interval [t6, t4] max , the minimum value of the DC component WZL min ; Among them, t6 is the start time of the evening peak, and the corresponding DC component value is the starting DC component of the evening peak WZL t5 ; t4 is the end time of the DC component, and the corresponding DC component is the end DC component of the evening peak WZL t3 ; by WZL t4 , WZL t6 , WZL min , WZL max These 4 values ​​are used to draw the evening peak K-line chart, where WZL t4 and WZL t6 Used to draw bar charts, WZL min and WZL max Used to draw lines.

[0026] In a second aspect, an embodiment of the present invention discloses a system for drawing a K-line diagram of a DC component of a transformer, comprising: a DC component monitoring data acquisition unit, a DC component start time and end time determination unit, and a DC component K-line diagram drawing unit; wherein:

[0027] A DC component monitoring data acquisition unit, used for acquiring transformer DC component monitoring data;

[0028] A DC component start time and end time determination unit, used to determine the start time and end time of the DC component according to the transformer DC component monitoring data;

[0029] The K-line graph drawing unit of the DC component is used to draw the K-line graph of the DC component according to the start time and the end time of the DC component and in combination with the positive and negative characteristics of the DC component.

[0030] In a third aspect, an embodiment of the present invention discloses an electronic device, including:

[0031] one or more processors;

[0032] A memory for storing one or more programs;

[0033] When the one or more programs are executed by the one or more processors, the one or more processors implement the drawing method.

[0034] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0035] The present invention discloses a method for drawing a K-line diagram of a transformer DC component, comprising: S100. acquiring transformer DC component monitoring data; S200. determining a start time and an end time of the DC component according to the transformer DC component monitoring data; S300. drawing a K-line diagram of the DC component according to the start time and the end time of the DC component in combination with the positive and negative characteristics of the DC component.

[0036] A method for drawing a DC component K-line graph provided by the present invention remotely sends the collected frequency bands to a collection device, obtains monitoring data in each frequency band, and obtains the optimal monitoring frequency by comprehensively analyzing the monitoring data of each frequency band. This can solve the problems of limited communication channels and large data transmission volume in the entire frequency band, and ensure the validity of vibration signal monitoring data.

[0037] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 This is a flow chart of a method for drawing a transformer DC component K-line diagram in Embodiment 1 of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of an electronic device in Example 3 of the present invention. DETAILED DESCRIPTION

[0041] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0042] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a method and system for drawing a K-line diagram of a DC component of a transformer.

[0043] Example 1

[0044] The present invention discloses a method for drawing a transformer DC component K-line diagram, such as Figure 1 ,include:

[0045] S100. Obtain transformer DC component monitoring data; In this embodiment, the method for obtaining transformer DC component monitoring data is not limited, and a special transformer DC bias tape live tester can be used. The live tester adopts an electrical measurement method. Without changing the original equipment wiring, it directly measures and displays the DC current value of the transformer in the operating state through the transformer neutral point grounding lead. It is also possible to install a DC component sensor to monitor the DC component value in electrical equipment in real time. It is also possible to use the electromagnetic field distribution characteristics inside the electrical equipment and use digital signal processing technology to extract the harmonic components of the DC component and calculate the size of the DC component.

[0046] In S100 of this embodiment, transformer DC component monitoring data is obtained, and the data is recorded as:

[0047]

[0048] Among them, ZL j,i is the DC component data of the j-th substation at the i-th monitoring point, where 1≤i≤n, 1≤j≤m, the data of the DC component monitoring point is one monitoring data per second, and the i-th monitoring point corresponds to the monitoring data at time i.

[0049] S200. Determine the start time and end time of the DC component according to the transformer DC component monitoring data;

[0050] Specifically, in S200 of this embodiment, the start time and the end time of the DC component are determined according to the DC component monitoring data of the transformer. The specific method includes:

[0051] S201. Determine the background period of the DC component, and obtain the average value and standard deviation of the DC component in the background period; in S201 of this embodiment, determine the background period of the DC component, the background period is [t1, t2], and the background period satisfies the following conditions:

[0052]

[0053] The average value of the DC component during the background period is The standard deviation of the DC component is

[0054]

[0055] Among them, t1 and t2 are the start and end times of the background period, ZL i is the DC component data of the substation at the i-th monitoring point, and YZ1 and YZ2 are the first preset time threshold and the second preset time threshold respectively.

[0056] S202. Calculate the start time and end time of the DC component according to the average value and standard deviation of the DC component.

[0057] Specifically, according to the average value and standard deviation of the DC component, the start time and the end time of the DC component are calculated, and the specific method includes:

[0058] Calculate the starting time of the DC component. For a certain time t3, if and Then the time t3 is the starting time of the DC component, where t3>t2;

[0059] Calculate the end time of the DC component. For a certain time t4, if and Then the time t4 is the end time of the DC component, where t4>t1.

[0060] S300. Draw a K-line graph of the DC component according to the start time and end time of the DC component and in combination with the positive and negative characteristics of the DC component.

[0061] In this embodiment, the DC component candlestick chart includes a morning peak candlestick chart and an evening peak candlestick chart; wherein the method for drawing the morning peak candlestick chart includes:

[0062] The maximum value ZZL of the DC component in the statistical time interval [t3, t5] max , the minimum value of the DC component is ZZL min ; Among them, t3 is the starting time of the DC component, and the corresponding DC component is the starting DC component of the morning peak t5 is the end time of the morning peak, preferably 9:30, and the corresponding DC component value is the end DC component of the morning peak pass ZZL min , ZZL max These 4 values ​​are used to draw the morning peak candlestick chart, and Used to draw a bar chart, ZZL min and ZZL max Used to draw lines.

[0063] In this embodiment, the evening peak K-line graph drawing method includes: counting the maximum value WZL of the DC component in the time interval [t6, t4] max , the minimum value of the DC component WZL min ; Where t6 is the start time of the evening peak, preferably 18:00, and the corresponding DC component value is the starting DC component of the evening peak t4 is the end time of the DC component, and the corresponding DC component is the end DC component of the evening peak pass Wl min , WZL max These 4 values ​​are used to draw the evening peak K-line chart, and Used to draw bar charts, WZL min and WZL max Used to draw lines.

[0064] In order to better understand the present invention, the technical solution and effects of the present invention are described in detail with a specific embodiment below:

[0065] In step S100, the DC component monitoring data of the transformer is obtained. The DC component monitoring data of a transformer is as follows (only part of the sample data):

[0066]

[0067]

[0068] In step S200, the start time and end time of the DC component are determined according to the DC component monitoring data obtained in step S100. The start time of the DC component is 5:25, and the end time of the DC component is 0:30;

[0069] In step S300, according to the start time and end time of the DC component obtained in step S200, the positive and negative characteristics of the DC component are considered, and a K-line diagram of the DC component is drawn. The K-line diagram of the transformer morning peak is as follows: Figure 2 shown.

[0070] The present embodiment discloses a method for drawing a K-line graph of a transformer DC component, comprising: S100. acquiring transformer DC component monitoring data; S200. determining a start time and an end time of the DC component according to the transformer DC component monitoring data; S300. drawing a K-line graph of the DC component according to the start time and the end time of the DC component in combination with the positive and negative characteristics of the DC component.

[0071] The present embodiment provides a method for drawing a DC component K-line graph, which remotely sends the collected frequency bands to the collection device, obtains the monitoring data in each frequency band, and obtains the best monitoring frequency by comprehensively analyzing the monitoring data in each frequency band. This can solve the problems of limited communication channels and large data transmission volume in the entire frequency band, and ensure the validity of the vibration signal monitoring data.

[0072] Example 2

[0073] Based on the method for drawing a transformer DC component K-line graph in Example 1, this embodiment discloses a transformer DC component K-line graph drawing system, including: a DC component monitoring data acquisition unit, a DC component start time and end time determination unit, and a DC component K-line graph drawing unit; wherein:

[0074] A DC component monitoring data acquisition unit, used for acquiring transformer DC component monitoring data;

[0075] A DC component start time and end time determination unit, used to determine the start time and end time of the DC component according to the transformer DC component monitoring data;

[0076] The K-line graph drawing unit of the DC component is used to draw the K-line graph of the DC component according to the start time and the end time of the DC component and in combination with the positive and negative characteristics of the DC component.

[0077] Among them, the specific working methods of the DC component monitoring data acquisition unit, the DC component start time and end time determination unit and the DC component K-line chart drawing unit have been described in detail in Example 1, and will not be repeated in this embodiment.

[0078] Example 3

[0079] Based on the same inventive concept, an embodiment of the present disclosure also provides an electronic device. Figure 2 FIG. 1 is a schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure. Figure 2 As shown, an embodiment of the present disclosure provides an electronic device including: one or more processors 101, a memory 102, and one or more I / O interfaces 103. The memory 102 stores one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement any optimization method in the above embodiments; the one or more I / O interfaces 103 are connected between the processor and the memory, and are configured to implement information interaction between the processor and the memory.

[0080] Among them, the processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU), etc.; the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH); the I / O interface (read-write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus), etc.

[0081] In some embodiments, the processor 101 , the memory 102 , and the I / O interface 103 are connected to each other via a bus 104 , and further connected to other components of the computing device.

[0082] In some embodiments, the one or more processors 101 include a field programmable gate array.

[0083] According to an embodiment of the present disclosure, a computer-readable medium is further provided, wherein a computer program is stored on the computer-readable medium, wherein when the program is executed by a processor, the steps in any optimization method in the above-mentioned embodiment are implemented.

[0084] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0085] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0086] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein can all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on specific applications and the design constraints imposed on the entire system. A skilled person can implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present disclosure.

[0087] The steps of the method or algorithm described in conjunction with the embodiments herein may be directly embodied as hardware, a software module executed by a processor, or a combination thereof. The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and the storage medium may also be present in a user terminal as discrete components.

[0088] For software implementation, the techniques described in this application can be implemented with modules (e.g., procedures, functions, etc.) that perform the functions described in this application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or outside the processor. In the latter case, it is coupled to the processor in a communication manner via various means, which are well known in the art.

[0089] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A method for drawing a transformer DC component K-line diagram, characterized in that: include: S100. Obtaining transformer DC component monitoring data; In S100, obtaining transformer DC component monitoring data, the data is recorded as: Among them, ZL j,i is the DC component data of the j-th substation at the i-th monitoring point, where 1≤i≤n, 1≤j≤m, the data of the DC component monitoring point is one monitoring data per second, and the i-th monitoring point corresponds to the monitoring data at time i; S200. Determine the start time and end time of the DC component according to the DC component monitoring data of the transformer; the specific method includes: S201. Determine the background period of the DC component, and obtain the mean value and standard deviation of the DC component in the background period; In S201, determine the background period of the DC component, the background period is [t1, t2], and the background period satisfies the following conditions: The average value of the DC component during the background period is The standard deviation of the DC component is Among them, t1 and t2 are the start and end times of the background period, ZL i is the DC component data of the substation at the i-th monitoring point, YZ1 and YZ2 are the first preset time threshold and the second preset time threshold respectively; S202. Calculate the start time and end time of the DC component according to the average value and standard deviation of the DC component; the specific method includes: Calculate the starting time of the DC component. For a certain time t3, if and Then the time t3 is the starting time of the DC component, where t3>t2; Calculate the end time of the DC component. For a certain time t4, if and Then the time t4 is the end time of the DC component, where t4>t1; S300. Draw a K-line graph of the DC component according to the start time and end time of the DC component and in combination with the positive and negative characteristics of the DC component.

2. The method for drawing a transformer DC component K-line diagram according to claim 1, characterized in that: In S300, a K-line graph of the DC component is drawn according to the start time and the end time of the DC component and in combination with the positive and negative characteristics of the DC component, wherein the DC component K-line graph includes a morning peak K-line graph and an evening peak K-line graph; The methods for drawing the morning peak K-line chart include: The maximum value ZZL of the DC component in the statistical time interval [t3, t5] max , the minimum value of the DC component is ZZL min ; Among them, t3 is the starting time of the DC component, and the corresponding DC component is the starting DC component of the morning peak t5 is the end time of the morning peak, and the corresponding DC component value is the DC component at the end of the morning peak. pass ZZL min , ZZL max These 4 values ​​are used to draw the morning peak candlestick chart, and Used to draw a bar chart, ZZL min and ZZL max Used to draw lines.

3. The method for drawing a transformer DC component K-line diagram according to claim 1, characterized in that: The method of drawing the evening peak candlestick chart includes: calculating the maximum value WZL of the DC component in the statistical time interval [t6, t4] max , the minimum value of the DC component WZL min ; Among them, t6 is the start time of the evening peak, and the corresponding DC component value is the starting DC component of the evening peak t4 is the end time of the DC component, and the corresponding DC component is the end DC component of the evening peak pass Wl min , WZL max These 4 values ​​are used to draw the evening peak K-line chart, and Used to draw bar charts, WZL min and WZL max Used to draw lines.

4. A system for drawing a transformer DC component K-line diagram, using any drawing method described in claims 1-3, characterized in that: include: A DC component monitoring data acquisition unit, a DC component start time and end time determination unit, and a DC component K-line graph drawing unit; wherein: A DC component monitoring data acquisition unit, used for acquiring transformer DC component monitoring data; A DC component start time and end time determination unit, used to determine the start time and end time of the DC component according to the transformer DC component monitoring data; The K-line graph drawing unit of the DC component is used to draw the K-line graph of the DC component according to the start time and the end time of the DC component and in combination with the positive and negative characteristics of the DC component.

5. An electronic device comprising: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the drawing method according to any one of claims 1 to 3.

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