Distribution transformer power electronic tap changer contact structure design method and device

Abstract

The present invention relates to the technical field of electric power equipment, and discloses a method and device for designing the contact structure of a power electronic tap changer of a distribution transformer. The present invention analyzes the relative position relationship between each moving contact according to the switching action timing information of the power electronic tap changer of the distribution transformer to determine the spatial arrangement mode of the moving contact, and determines the parameter setting requirements according to the spatial arrangement mode of the moving contact, determines the moving contact radius parameter value that meets the parameter setting requirements, calculates the angle that the moving contact rotates during the state switching process according to the maximum number of tapping gears, calculates the spatial position coordinates, closed trajectory arc and adjacent inflection point coordinates of each moving contact according to the moving contact radius parameter value and the angle, and calculates the minimum distance between static contacts of different gears; and determines the static contact electrode shape according to the adjacent inflection point coordinates of each moving contact. The present invention realizes the design of the contact structure of the tap changer, and the specific values ​​of various contact parameters can be quickly and effectively determined according to the method of the present invention.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a method and a device for designing a contact structure of a power electronic tap changer of a distribution transformer. Background Art

[0002] As an important component for grid voltage regulation, power electronic tap changers can regulate voltage without power failure in distribution transformers, meeting the application requirements of frequent power regulation in high-voltage DC operation.

[0003] The contact structure of a power electronic tap changer generally includes a plurality of stationary contacts, one main contact, two thyristor trigger contacts, two thyristor auxiliary contacts and a transmission shaft; all the stationary contacts are arc-shaped conductive sheets and are distributed on a circle with the transmission shaft as the center, forming a cylindrical structure around the transmission shaft; the one main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts serve as moving contacts, are all connected to the transmission shaft, rotate with the transmission shaft, and are in sliding contact with the stationary contacts.

[0004] The structural design of each contact affects the switching performance of the power electronic tap changer, thereby affecting the stability of the voltage regulation of the power electronic tap changer. Therefore, it is necessary to design the parameters such as the shape and position of each contact so that the contact structure can meet the corresponding performance requirements.

[0005] Currently, there is no relevant power electronic tap changer contact structure design method provided, which has certain design difficulties. Summary of the invention

[0006] The present invention provides a method and a device for designing a contact structure of a power electronic tap changer of a distribution transformer, and solves the technical problem of how to simply and effectively design a contact structure of a power electronic tap changer.

[0007] A first aspect of the present invention provides a method for designing a contact structure of a power electronic tap changer of a distribution transformer, wherein the power electronic tap changer contact comprises a plurality of stationary contacts, a main contact, two thyristor trigger contacts and two thyristor auxiliary contacts, wherein the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts are all movable contacts, and the method comprises:

[0008] Obtain the switching action timing information and maximum number of tapping levels of the power electronic tap changer of the distribution transformer;

[0009] Analyze the relative position relationship between the moving contacts according to the switching action timing information, and determine the spatial arrangement of the moving contacts according to the relative position relationship analysis results;

[0010] Determine parameter setting requirements according to the spatial arrangement of the moving contacts, and determine moving contact radius parameter values ​​that meet the parameter setting requirements, wherein the moving contact radius parameter values ​​include a position radius and a contact radius of each moving contact;

[0011] Calculate the angle of the moving contact during the state switching process according to the maximum tapping gear number, calculate the spatial position coordinates, closed trajectory arc and adjacent inflection point coordinates of each moving contact according to the moving contact radius parameter value and the angle, and calculate the minimum distance between static contacts at different gears;

[0012] The shape of the static contact electrode is determined according to the coordinates of the adjacent inflection points of each of the moving contacts.

[0013] According to an achievable manner of the first aspect of the present invention, determining the spatial arrangement of the moving contacts according to the obtained relative position relationship analysis results includes:

[0014] According to the relative position relationship analysis result, a corresponding moving contact space arrangement mode is matched from a moving contact space arrangement mode library, wherein the moving contact space arrangement mode library stores a plurality of moving contact space arrangement modes and associated relative position relationship feature information for matching.

[0015] According to an achievable manner of the first aspect of the present invention, determining the parameter setting requirement according to the spatial arrangement of the moving contacts includes:

[0016] Determining whether two thyristor trigger contacts share a closing track according to the spatial arrangement of the moving contacts, and determining whether two thyristor auxiliary contacts share a closing track;

[0017] If the two thyristor trigger contacts share a closed trajectory and the two thyristor auxiliary contacts share a closed trajectory, determining that the parameter setting requirement consists of a first parameter setting constraint, a second parameter setting constraint and a third parameter setting constraint;

[0018] If the two thyristor trigger contacts do not share a closed trajectory and the two thyristor auxiliary contacts share a closed trajectory, determining that the parameter setting requirement consists of a first parameter setting constraint, a third parameter setting constraint, and a fourth parameter setting constraint;

[0019] If the two thyristor trigger contacts share a closed trajectory and the two thyristor auxiliary contacts do not share a closed trajectory, determining that the parameter setting requirement consists of a first parameter setting constraint, a second parameter setting constraint, and a fifth parameter setting constraint;

[0020] If the two thyristor trigger contacts do not share a closed trajectory and the two thyristor auxiliary contacts do not share a closed trajectory, determining that the parameter setting requirement consists of a first parameter setting constraint, a third parameter setting constraint and a fifth parameter setting constraint;

[0021] Wherein, the first parameter setting constraint is:

[0022]

[0023] The second parameter sets the constraints as:

[0024]

[0025] The third parameter setting constraint is:

[0026]

[0027] The fourth parameter setting constraint is:

[0028]

[0029] The fifth parameter sets the constraints as follows:

[0030]

[0031] In the formula, R 0 The radius of the main contact, R 1 is the location radius of the first thyristor auxiliary contact, R 2 is the radius of the first thyristor trigger contact, R 3 is the location radius of the second thyristor auxiliary contact, R 4 is the radius of the second thyristor trigger contact, r 0 The contact radius of the main contact, r 1 is the contact radius of the first thyristor auxiliary contact, r 2 is the contact radius of the first thyristor trigger contact, r 3 is the contact radius of the second thyristor auxiliary contact, r 4 is the contact radius of the second thyristor trigger contact.

[0032] According to an achievable manner of the first aspect of the present invention, the calculating the angle rotated by the moving contact during the state switching process according to the maximum tapping gear number includes:

[0033] Calculate the center angle of adjacent tap positions according to the maximum tapping number:

[0034]

[0035] In the formula, It represents the center angle between adjacent tap positions, and N is the maximum number of tap positions;

[0036] The angle that the moving contact rotates during the state switching process is calculated based on the center angle of the adjacent tap positions:

[0037]

[0038] Where α represents the angle that the moving contact rotates during the state switching process, and M is the number of switching actions included in the state switching process of the power electronic tap changer of the distribution transformer.

[0039] According to an achievable manner of the first aspect of the present invention, the calculating of the spatial position coordinates, the closed trajectory arc and the adjacent inflection point coordinates of each of the moving contacts according to the moving contact radius parameter value and the angle includes:

[0040] With (0, R 0 ) as the spatial position coordinate of the main contact, and (R 1 sin 2α, R 1 cos 2α) as the spatial position coordinate of the first thyristor auxiliary contact, and (-R 3 sin 2α, R 3 cos 2α) as the spatial position coordinate of the second thyristor auxiliary contact, and (R 2 sin 2α, R 2 cos 2α) as the spatial position coordinate of the first thyristor trigger contact, and (-R 4 sin 2α, R 4 cos 2α) as the spatial position coordinates of the second thyristor trigger contact.

[0041] According to an achievable manner of the first aspect of the present invention, the calculating of the spatial position coordinates, the closed trajectory arc and the adjacent inflection point coordinates of each of the moving contacts according to the moving contact radius parameter value and the angle further includes:

[0042] Calculate the closing trajectory arc of the main contact:

[0043]

[0044] Calculate the closing trajectory arc of the first thyristor auxiliary contact:

[0045] Arc(x, y), x = (-R 1 sin 4.5α, R 1 cos 4.5α), y=(R 1 sin 4.5α, R 1 cos 4.5α)

[0046] Calculate the closing trajectory arc of the second thyristor auxiliary contact:

[0047] Arc(x, y), x = (-R 3 sin 4.5α, R 3 cos 4.5α), y=(R 3 sin 4.5α, R 3 cos 4.5α)

[0048] Calculate the closing trajectory arc of the first thyristor trigger contact:

[0049] Arc(x, y), x = (-R 2 sin 3.5α, R 2 cos 3.5α), y=(R 2 sin 3.5α, R 2 cos 3.5α)

[0050] Calculate the closing trajectory arc of the second thyristor trigger contact:

[0051] Arc(x, y), x = (-R 4 sin 3.5α, R 4 cos 3.5α), y=(R 4 sin 3.5α, R 4 cos 3.5α)

[0052] Wherein, Arc(x, y) represents the arc between point x and point y with the coordinate origin as the center.

[0053] According to an achievable manner of the first aspect of the present invention, the calculating of the spatial position coordinates, the closed trajectory arc and the adjacent inflection point coordinates of each of the moving contacts according to the moving contact radius parameter value and the angle further includes:

[0054] Calculate the longitudinal distance W from the main contact to its adjacent inflection point A :

[0055] W A =0.5min(|R 1 -R 0 |,|R 2 -R 0 |,|R 3 -R 0 |,|R 4 -R 0 |)

[0056] According to the longitudinal distance W A Determine the coordinates of each adjacent inflection point of the main contact as and

[0057] Calculate the longitudinal distance W from the first thyristor auxiliary contact to its adjacent inflection point B :

[0058] W B =0.5min(|R 0 -R 1 |,|R 2 -R 1 |,|R 3 -R 1 |,|R 4 -R 1 |)

[0059] According to the longitudinal distance W B Determine the coordinates of each adjacent inflection point of the first thyristor auxiliary contact as [(R 1 +W B )sin 4.5α, (R 1 +W B )cos 4.5α], [-(R 1 +W B )sin 4.5α, (R 1 +W B )cos 4.5α], [(R 1 -W B )sin4.5α,(R 1 -W B )cos 4.5α] and [-(R 1 -W B )sin 4.5α, (R 1 -W B )cos 4.5α];

[0060] Calculate the longitudinal distance W from the second thyristor auxiliary contact to its adjacent inflection point C :

[0061] W C =0.5min(|R 0 -R 3 |,|R 1 -R 3 |,|R 2 -R 3 |,|R 4 -R 3 |)

[0062] According to the longitudinal distance W C Determine the coordinates of each adjacent inflection point of the second thyristor auxiliary contact as [(R 3 +W C)sin 4.5α, (R 3 +W C )cos 4.5α], [-(R 3 +W C )sin 4.5α, (R 3 +W C )cos 4.5α], [(R 3 -W C )sin4.5α,(R 3 -W C )cos 4.5α] and [-(R 3 -W C )sin 4.5α, (R 3 -W C )cos 4.5α];

[0063] Calculate the longitudinal distance W from the first thyristor trigger contact to its adjacent inflection point D :

[0064] W D =0.5min(|R 0 -R 2 |,|R 1 -R 2 |,|R 3 -R 2 |,|R 4 -R 2 |)

[0065] According to the longitudinal distance W D Determine the coordinates of each adjacent inflection point of the first thyristor trigger contact as [(R 2 +W D )sin 3.5α, (R 2 +W D )cos 3.5α], [-(R 2 +W D )sin 3.5α, (R 2 +W D )cos 3.5α], [(R 2 -W D )sin3.5α,(R 2 -W D )cos 3.5α] and -[(R 2 -W D )sin 3.5α, (R 2 -W D )cos 3.5α];

[0066] Calculate the longitudinal distance W from the second thyristor trigger contact to its adjacent inflection pointE :

[0067] W E =0.5min(|R 0 -R 4 |,|R 1 -R 4 |,|R 3 -R 4 |,|R 3 -R 4 |)

[0068] According to the longitudinal distance W E Determine the coordinates of each adjacent inflection point of the first thyristor trigger contact as [(R 4 +W E )sin 3.5α, (R 4 +W E )cos 3.5α], [-(R 4 +W E )sin 3.5α, (R 4 +W E )cos 3.5α], [(R 4 -W E )sin3.5α,(R 4 -W E )cos 3.5α] and [-(R 4 -W E )sin 3.5α, (R 4 -W E )cos 3.5α].

[0069] According to an achievable manner of the first aspect of the present invention, the calculating the minimum distance between static contacts at different gear positions includes:

[0070] Calculate the minimum distance between adjacent stationary contacts:

[0071]

[0072] Where, L A is the minimum distance between adjacent static contacts;

[0073] Calculate the minimum distance between the static contacts in the limit gear:

[0074]

[0075] Where, L B It is the minimum distance between the static contacts in the limit gear position.

[0076] A second aspect of the present invention provides a device for designing the contact structure of a power electronic tap changer of a distribution transformer, wherein the power electronic tap changer contact comprises a plurality of stationary contacts, a main contact, two thyristor trigger contacts and two thyristor auxiliary contacts, wherein the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts are all movable contacts, and the device comprises:

[0077] An acquisition module is used to obtain the switching action timing information and the maximum number of tapping gears of the power electronic tap changer of the distribution transformer;

[0078] A first determination module is used to analyze the relative position relationship between the moving contacts according to the switching action timing information, and determine the spatial arrangement of the moving contacts according to the relative position relationship analysis result;

[0079] A second determination module is used to determine parameter setting requirements according to the spatial arrangement of the moving contacts, and determine a moving contact radius parameter value that meets the parameter setting requirements, wherein the moving contact radius parameter value includes a position radius and a contact radius of each moving contact;

[0080] A calculation module, used to calculate the angle of rotation of the moving contact during the state switching process according to the maximum tapping gear number, calculate the spatial position coordinates, closed trajectory arc and adjacent inflection point coordinates of each moving contact according to the moving contact radius parameter value and the angle, and calculate the minimum distance between static contacts of different gears;

[0081] The third determination module is used to determine the shape of the static contact electrode according to the coordinates of the adjacent inflection points of each of the moving contacts.

[0082] According to an achievable manner of the second aspect of the present invention, the first determining module includes:

[0083] The first determination unit is used to match the corresponding moving contact space arrangement mode from the moving contact space arrangement mode library according to the relative position relationship analysis result, and the moving contact space arrangement mode library stores multiple moving contact space arrangement modes and associated relative position relationship feature information for matching.

[0084] According to an achievable manner of the second aspect of the present invention, the second determining module includes:

[0085] A second determination unit is used to determine whether the two thyristor trigger contacts share a closing trajectory according to the spatial arrangement of the moving contacts, and to determine whether the two thyristor auxiliary contacts share a closing trajectory;

[0086] a third determining unit, configured to determine, if the two thyristor trigger contacts share a closed trajectory and the two thyristor auxiliary contacts share a closed trajectory, that the parameter setting requirement consists of a first parameter setting constraint, a second parameter setting constraint and a third parameter setting constraint;

[0087] a fourth determining unit, configured to determine, if the two thyristor trigger contacts do not share a closing trajectory and the two thyristor auxiliary contacts share a closing trajectory, that the parameter setting requirement consists of a first parameter setting constraint, a third parameter setting constraint and a fourth parameter setting constraint;

[0088] a fifth determining unit, configured to determine, if the two thyristor trigger contacts share a closing trajectory and the two thyristor auxiliary contacts do not share a closing trajectory, that the parameter setting requirement consists of a first parameter setting constraint, a second parameter setting constraint and a fifth parameter setting constraint;

[0089] a sixth determining unit, configured to determine, if the two thyristor trigger contacts do not share a closed trajectory and the two thyristor auxiliary contacts do not share a closed trajectory, that the parameter setting requirement consists of a first parameter setting constraint, a third parameter setting constraint and a fifth parameter setting constraint;

[0090] Wherein, the first parameter setting constraint is:

[0091]

[0092] The second parameter sets the constraints as:

[0093]

[0094] The third parameter setting constraint is:

[0095]

[0096] The fourth parameter setting constraint is:

[0097]

[0098] The fifth parameter sets the constraints as follows:

[0099]

[0100] In the formula, R 0 The radius of the main contact, R 1 is the location radius of the first thyristor auxiliary contact, R 2 is the radius of the first thyristor trigger contact, R 3 is the location radius of the second thyristor auxiliary contact, R 4 is the radius of the second thyristor trigger contact, r 0The contact radius of the main contact, r 1 is the contact radius of the first thyristor auxiliary contact, r 2 is the contact radius of the first thyristor trigger contact, r 3 is the contact radius of the second thyristor auxiliary contact, r 4 is the contact radius of the second thyristor trigger contact.

[0101] According to an achievable manner of the second aspect of the present invention, the calculation module includes:

[0102] The first calculation unit is used to calculate the central angle of adjacent tap positions according to the maximum tapping gear number:

[0103]

[0104] In the formula, It represents the center angle between adjacent tap positions, and N is the maximum number of tap positions;

[0105] The second calculation unit is used to calculate the angle that the moving contact rotates during the state switching process according to the central angle of the adjacent tap positions:

[0106]

[0107] Where α represents the angle that the moving contact rotates during the state switching process, and M is the number of switching actions included in the state switching process of the power electronic tap changer of the distribution transformer.

[0108] According to an achievable manner of the second aspect of the present invention, the calculation module further includes:

[0109] The third computing unit is used to calculate (0, R 0 ) as the spatial position coordinate of the main contact, and (R 1 sin 2α, R 1 cos 2α) as the spatial position coordinate of the first thyristor auxiliary contact, and (-R 2 sin 2α, R 3 cos 2α) as the spatial position coordinate of the second thyristor auxiliary contact, and (R 2 sin 2α, R 2 cos 2α) as the spatial position coordinate of the first thyristor trigger contact, and (-R 4 sin 2α, R 4 cos 2α) as the spatial position coordinates of the second thyristor trigger contact.

[0110] According to an achievable manner of the second aspect of the present invention, the calculation module further includes:

[0111] The fourth calculation unit is used to calculate the closing trajectory arc of the main contact:

[0112]

[0113] The fifth calculation unit is used to calculate the closing trajectory arc of the first thyristor auxiliary contact:

[0114] Arc(x, y), x = (-R 1 sin 4.5α, R 1 cos 4.5α), y=(R 1 sin 4.5α, R 1 cos 4.5α)

[0115] The sixth calculation unit is used to calculate the closing trajectory of the second thyristor auxiliary contact:

[0116] Arc(x, y), x = (-R 3 sin 4.5α, R 3 cos 4.5α), y=(R 3 sin 4.5α, R 3 cos 4.5α)

[0117] The seventh calculation unit is used to calculate the closing trajectory arc of the first thyristor trigger contact:

[0118] Arc(x, y), x = (-R 2 sin 3.5α, R 2 cos 3.5α), y=(R 2 sin 3.5α, R 2 cos 3.5α)

[0119] An eighth calculation unit is used to calculate the closing trajectory arc of the second thyristor trigger contact:

[0120] Arc(x, y), x = (-R 4 sin 3.5α, R 4 cos 3.5α), y=(R 4 sin 3.5α, R 4 cos 3.5α)

[0121] Wherein, Arc(x, y) represents the arc between point x and point y with the coordinate origin as the center.

[0122] According to an achievable manner of the second aspect of the present invention, the calculation module further includes:

[0123] The ninth calculation unit is used to calculate the longitudinal distance W from the main contact to its adjacent inflection point. A :

[0124] W A =0.5min(|R 1 -R 0 |,|R 2 -R 0 |,|R 3 -R 0 |,|R 4 -R 0 |)

[0125] A seventh determining unit is configured to determine the longitudinal distance W according to the longitudinal distance W. A Determine the coordinates of each adjacent inflection point of the main contact as and

[0126] A tenth calculation unit is used to calculate the longitudinal distance W from the first thyristor auxiliary contact to its adjacent inflection point. B :

[0127] W B =0.5min(|R 0 -R 1 |,|R 2 -R 1 |,|R 3 -R 1 |,|R 4 -R 1 |)

[0128] An eighth determining unit is configured to determine the longitudinal distance W according to the longitudinal distance W. B Determine the coordinates of each adjacent inflection point of the first thyristor auxiliary contact as [(R 1 +W B )sin 4.5α, (R 1 +W B )cos 4.5α], [-(R 1 +W B )sin 4.5α, (R 1 +W B )cos 4.5α], [(R 1 -W B )sin 4.5α, (R 1 -W B )cos 4.5α] and [-(R 1 -W B )sin 4.5α, (R 1 -WB )cos 4.5α];

[0129] The eleventh calculation unit is used to calculate the longitudinal distance W from the second thyristor auxiliary contact to its adjacent inflection point. C :

[0130] W C =0.5nmin(|R 0 -R 3 |,|R 1 -R 3 |,|R 2 -R 3 |,|R 4 -R 3 |)

[0131] A ninth determining unit is configured to determine the longitudinal distance W according to the longitudinal distance W. C Determine the coordinates of each adjacent inflection point of the second thyristor auxiliary contact as [(R 3 +W C )sin 4.5α, (R 3 +W C )cos 4.5α], [-(R 3 +W C )sin 4.5α, (R 3 +W C )cos 4.5α], [(R 3 -W C )sin 4.5α, (R 3 -W C )cos 4.5α] and [-(R 3 -W C )sin 4.5α, (R 3 -W C )cos 4.5α];

[0132] The twelfth calculation unit is used to calculate the longitudinal distance W from the first thyristor trigger contact to its adjacent inflection point D :

[0133] W D =0.5min(|R 0 -R 2 |,|R 1 -R 2 |,|R 3 -R 2 |,|R 4 -R 2 |)

[0134] A tenth determining unit is configured to determine the longitudinal distance W according to the longitudinal distance W. DDetermine the coordinates of each adjacent inflection point of the first thyristor trigger contact as [(R 2 +W D )sin 3.5α, (R 2 +W D )cos 3.5α], [-(R 2 +W D )sin 3.5α, (R 2 +W D )cos 3.5α], [(R 2 -W D )sin 3.5α, (R 2 -W D )cos 3.5α] and -[(R 2 -W D )sin 3.5α, (R 2 -W D )cos 3.5α];

[0135] The thirteenth calculation unit is used to calculate the longitudinal distance W from the second thyristor trigger contact to its adjacent inflection point. E :

[0136] W E =0.5min(|R 0 -R 4 |,|R 1 -R 4 |,|R 3 -R 4 |,|R 3 -R 4 |)

[0137] The eleventh determining unit is configured to determine the longitudinal distance W according to the longitudinal distance W. E Determine the coordinates of each adjacent inflection point of the first thyristor trigger contact as [(R 4 +W E )sin 3.5α, (R 4 +W E )cos 3.5α], [-(R 4 +W E )sin 3.5α, (R 4 +W E )cos3.5α], [(R 4 -W E )sin 3.5α, (R 4 -W E )cos 3.5α] and [-(R 4 -W E )sin 3.5α, (R 4 -WE )cos 3.5α].

[0138] According to an achievable manner of the second aspect of the present invention, the calculation module further includes:

[0139] The fourteenth calculation unit is used to calculate the minimum distance between adjacent static contacts:

[0140]

[0141] Where, L A is the minimum distance between adjacent static contacts;

[0142] The fifteenth calculation unit is used to calculate the minimum distance between the static contacts at the limit gear position:

[0143]

[0144] Where, L B It is the minimum distance between the static contacts in the limit gear position.

[0145] A third aspect of the present invention provides a device for designing a contact structure of a power electronic tap changer of a distribution transformer, comprising:

[0146] A memory for storing instructions; wherein the instructions are used to implement the method for designing a contact structure of a power electronic tap changer of a distribution transformer as described in any of the above implementation methods;

[0147] A processor is used to execute instructions in the memory.

[0148] A fourth aspect of the present invention is a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for designing a contact structure of a power electronic tap changer of a distribution transformer as described in any of the above achievable methods.

[0149] It can be seen from the above technical solutions that the present invention has the following advantages:

[0150] The present invention analyzes the relative position relationship between the moving contacts according to the switching action timing information of the power electronic tap changer of the distribution transformer to determine the spatial arrangement mode of the moving contacts, and determines the parameter setting requirements according to the spatial arrangement mode of the moving contacts, determines the moving contact radius parameter value that meets the parameter setting requirements, including the position radius and the contact radius of each moving contact, and calculates the angle rotated by the moving contact during the state switching process according to the maximum tapping gear number, calculates the spatial position coordinates, closed trajectory arc and adjacent inflection point coordinates of each moving contact according to the moving contact radius parameter value and the angle, and calculates the minimum distance between static contacts of different gears; and determines the static contact electrode shape according to the adjacent inflection point coordinates of each moving contact; the present invention realizes the design of the contact structure of the power electronic tap changer of the distribution transformer, and the method according to the present invention can quickly and effectively determine the specific values ​​of various contact parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0151] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0152] Figure 1 A flow chart of a method for designing a contact structure of a power electronic tap changer of a distribution transformer provided as an optional embodiment of the present invention;

[0153] Figure 2 A schematic diagram of the switching sequence of a power electronic tap changer of a distribution transformer provided by an optional embodiment of the present invention;

[0154] Figure 3 A schematic structural diagram of four spatial arrangements of moving contacts provided in an optional embodiment of the present invention;

[0155] Figure 4 A structural connection block diagram of a device for designing a contact structure of a power electronic tap changer of a distribution transformer provided in an optional embodiment of the present invention.

[0156] Reference numerals:

[0157] 1-acquisition module; 2-first determination module; 3-second determination module; 4-calculation module; 5-third determination module. DETAILED DESCRIPTION

[0158] The embodiments of the present invention provide a method and device for designing a contact structure of a power electronic tap changer of a distribution transformer, which are used to solve the technical problem of how to simply and effectively design a contact structure of a power electronic tap changer.

[0159] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below 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.

[0160] It should be noted that the power electronic tap changer contacts of the distribution transformer in the following embodiments of the present invention include multiple static contacts, one main contact, two thyristor trigger contacts and two thyristor auxiliary contacts, and the one main contact, two thyristor trigger contacts and two thyristor auxiliary contacts are all moving contacts.

[0161] A first aspect of the present invention provides a method for designing a contact structure of a power electronic tap changer of a distribution transformer.

[0162] See also Figure 1 , Figure 1 A flow chart of a method for designing a contact structure of a power electronic tap changer of a distribution transformer provided by an embodiment of the present invention is shown.

[0163] An embodiment of the present invention provides a method for designing a contact structure of a power electronic tap changer of a distribution transformer, comprising steps S1-S5.

[0164] Step S1, obtaining the switching action timing information and the maximum number of tapping levels of the power electronic tap changer of the distribution transformer.

[0165] Step S2, analyzing the relative position relationship between the moving contacts according to the switching action timing information, and determining the spatial arrangement of the moving contacts according to the relative position relationship analysis results.

[0166] For example, see Figure 2 , Figure 2 The switching timing diagram of the power electronic tap changer of the distribution transformer provided by an optional embodiment of the present invention is shown. Wherein T1 and T2 are thyristors respectively, A and B are stationary contacts, S1 and S3 are thyristor auxiliary contacts, S2 and S4 are thyristor trigger contacts, O is the output terminal, and N is the number of switching actions. Taking the change from stationary contact A to stationary contact B as an example, the action sequence of each contact has 10 states, a total of 9 processes, and the interval of each state switching process is t (for the convenience of analysis, it is assumed that the state switching time is the same). The detailed switching action sequence is: stationary contact A opens → trigger contact S4 opens → auxiliary contact S3 opens → auxiliary contact S3 closes → trigger contact S4 closes → trigger contact S2 opens → auxiliary contact S2 opens → auxiliary contact S2 closes → trigger contact S1 closes → stationary contact A closes.

[0167] according to Figure 2 The switching action timing information shown can be used to analyze the relative position relationship between the moving contacts, and the results are as follows:

[0168] The opening and closing states of the auxiliary contact S1 and the trigger contact S2 are symmetrical, and the opening and closing states of the auxiliary contact S3 and the trigger contact S4 are symmetrical. In another switching cycle, the time interval from closing to disconnecting and then to the closing state of the trigger contact S4 and the trigger contact S2 is 3t (t is the switching time of the switch switching state); the time interval from closing to disconnecting and then to the closing state of the auxiliary contact S3 and the trigger contact S1 is t. Therefore, the closing trajectory lengths of the two auxiliary contacts are the same, and the auxiliary contacts and the trigger contacts are symmetrically distributed.

[0169] Based on the relative position relationship analysis results, the spatial layout of the moving contacts can be determined.

[0170] In an achievable manner, determining the spatial arrangement of the moving contacts according to the obtained relative position relationship analysis results includes:

[0171] According to the relative position relationship analysis result, a corresponding moving contact space arrangement mode is matched from a moving contact space arrangement mode library, wherein the moving contact space arrangement mode library stores a plurality of moving contact space arrangement modes and associated relative position relationship feature information for matching.

[0172] Among them, various moving contact space arrangements may include Figure 3 Arrangement shown. Figure 3 In the figure, T1 and T2 are thyristors, A is a static contact, S1 and S3 are thyristor auxiliary contacts, S2 and S4 are thyristor trigger contacts, and R, R1 and R2 are resistors. Figure 3 In the three moving contact spatial arrangements a, b, and c shown, the position radius of the thyristor auxiliary contact is equal to the position radius of the thyristor auxiliary contact, and the position radius of the thyristor trigger contact is equal to the position radius of the thyristor trigger contact, that is, the two thyristor auxiliary contacts share a closed trajectory, and the two thyristor trigger contacts share a closed trajectory.

[0173] In the embodiment of the present invention, a moving contact space arrangement method library is pre-set, and then the moving contact space arrangement method is determined by identification and matching. The method is simple and convenient.

[0174] Step S3, determining parameter setting requirements according to the spatial arrangement of the moving contacts, and determining moving contact radius parameter values ​​that meet the parameter setting requirements, wherein the moving contact radius parameter values ​​include a position radius and a contact radius of each moving contact.

[0175] In one achievable manner, the determining the parameter setting requirement according to the spatial arrangement of the moving contacts includes:

[0176] Determining whether two thyristor trigger contacts share a closing track according to the spatial arrangement of the moving contacts, and determining whether two thyristor auxiliary contacts share a closing track;

[0177] If the two thyristor trigger contacts share a closed trajectory and the two thyristor auxiliary contacts share a closed trajectory, determining that the parameter setting requirement consists of a first parameter setting constraint, a second parameter setting constraint and a third parameter setting constraint;

[0178] If the two thyristor trigger contacts do not share a closed trajectory and the two thyristor auxiliary contacts share a closed trajectory, determining that the parameter setting requirement consists of a first parameter setting constraint, a third parameter setting constraint, and a fourth parameter setting constraint;

[0179] If the two thyristor trigger contacts share a closed trajectory and the two thyristor auxiliary contacts do not share a closed trajectory, determining that the parameter setting requirement consists of a first parameter setting constraint, a second parameter setting constraint, and a fifth parameter setting constraint;

[0180] If the two thyristor trigger contacts do not share a closed trajectory and the two thyristor auxiliary contacts do not share a closed trajectory, determining that the parameter setting requirement consists of a first parameter setting constraint, a third parameter setting constraint and a fifth parameter setting constraint;

[0181] Wherein, the first parameter setting constraint is:

[0182]

[0183] The second parameter sets the constraints as:

[0184]

[0185] The third parameter setting constraint is:

[0186]

[0187] The fourth parameter setting constraint is:

[0188]

[0189] The fifth parameter sets the constraints as follows:

[0190]

[0191] In the formula, R 0 The radius of the main contact, R 1is the location radius of the first thyristor auxiliary contact, R 2 is the radius of the first thyristor trigger contact, R 3 is the location radius of the second thyristor auxiliary contact, R 4 is the radius of the second thyristor trigger contact, r 0 The contact radius of the main contact, r 1 is the contact radius of the first thyristor auxiliary contact, r 2 is the contact radius of the first thyristor trigger contact, r 3 is the contact radius of the second thyristor auxiliary contact, r 4 is the contact radius of the second thyristor trigger contact.

[0192] During specific implementation, the specific values ​​of the position radius and contact radius of each moving contact can be input according to the actual situation, and then the system verifies whether the input specific values ​​are valid according to the determined parameter setting requirements. If valid, the subsequent steps are executed, and if invalid, that is, the parameter setting requirements are not met, the corresponding prompt information is output.

[0193] In an embodiment of the present invention, various parameter setting constraints are provided, and based on the spatial arrangement of the moving contacts, it is determined whether the two thyristor trigger contacts share a closing trajectory, and it is determined whether the two thyristor auxiliary contacts share a closing trajectory. According to the determined results, corresponding parameter setting constraints are selected to form parameter setting requirements. The method is simple and fast, and can improve the efficiency of the tap switch contact structure design.

[0194] Step S4, calculating the angle that the moving contact rotates during the state switching process according to the maximum tapping gear number, calculating the spatial position coordinates, closed trajectory arc and adjacent inflection point coordinates of each moving contact according to the moving contact radius parameter value and the angle, and calculating the minimum distance between static contacts in different gears.

[0195] In one achievable manner, the step of calculating the angle rotated by the moving contact during the state switching process according to the maximum tapping gear number includes:

[0196] Calculate the center angle of adjacent tap positions according to the maximum tapping number:

[0197]

[0198] In the formula, It represents the center angle between adjacent tap positions, and N is the maximum number of tap positions;

[0199] The angle that the moving contact rotates during the state switching process is calculated based on the center angle of the adjacent tap positions:

[0200]

[0201] Where α represents the angle that the moving contact rotates during the state switching process, and M is the number of switching actions included in the state switching process of the power electronic tap changer of the distribution transformer.

[0202] In one achievable manner, the calculating of the spatial position coordinates, the closed trajectory arc and the adjacent inflection point coordinates of each of the moving contacts according to the moving contact radius parameter value and the angle includes:

[0203] With (0, R 0 ) as the spatial position coordinate of the main contact, and (R 1 sin 2α, R 1 cos 2α) as the spatial position coordinate of the first thyristor auxiliary contact, and (-R 3 sin 2α, R 3 cos 2α) as the spatial position coordinate of the second thyristor auxiliary contact, and (R 2 sin 2α, R 2 cos 2α) as the spatial position coordinate of the first thyristor trigger contact, and (-R 4 sin 2α, R 4 cos 2α) as the spatial position coordinates of the second thyristor trigger contact.

[0204] In an achievable manner, the calculating of the spatial position coordinates, the closed trajectory arc and the adjacent inflection point coordinates of each of the moving contacts according to the moving contact radius parameter value and the angle further includes:

[0205] Calculate the closing trajectory arc of the main contact:

[0206]

[0207] Calculate the closing trajectory arc of the first thyristor auxiliary contact:

[0208] Arc(x, y), x = (-R 1 sin 4.5α, R 1 cos 4.5α), y=(R 1 sin 4.5α, R 1 cos 4.5α)

[0209] Calculate the closing trajectory arc of the second thyristor auxiliary contact:

[0210] Arc(x, y), x = (-R 3 sin 4.5α, R 3 cos 4.5α), y=(R 3 sin 4.5α, R3 cos 4.5α)

[0211] Calculate the closing trajectory arc of the first thyristor trigger contact:

[0212] Arc(x, y), x = (-R 2 sin 3.5α, R 2 cos 3.5α), y=(R 2 sin 3.5α, R 2 cos 3.5α)

[0213] Calculate the closing trajectory arc of the second thyristor trigger contact:

[0214] Arc(x, y), x = (-R 4 sin 3.5α, R 4 cos 3.5α), y=(R 4 sin 3.5α, R 4 cos 3.5α)

[0215] Wherein, Arc(x, y) represents the arc between point x and point y with the coordinate origin as the center.

[0216] In an achievable manner, the calculating of the spatial position coordinates, the closed trajectory arc and the adjacent inflection point coordinates of each of the moving contacts according to the moving contact radius parameter value and the angle further includes:

[0217] Calculate the longitudinal distance W from the main contact to its adjacent inflection point A :

[0218] W A =0.5min(|R 1 -R 0 |,|R 2 -R 0 |,|R 3 -R 0 |,|R 4 -R 0 |)

[0219] According to the longitudinal distance W A Determine the coordinates of each adjacent inflection point of the main contact as and

[0220] Calculate the longitudinal distance W from the first thyristor auxiliary contact to its adjacent inflection point B :

[0221] WB =0.5min(|R 0 -R 1 |,|R 2 -R 1 |,|R 3 -R 1 |,|R 4 -R 1 |)

[0222] According to the longitudinal distance W B Determine the coordinates of each adjacent inflection point of the first thyristor auxiliary contact as [(R 1 +W B )sin 4.5α, (R 1 +W B )cos 4.5α], [-(R 1 +W B )sin 4.5α, (R 1 +W B )cos 4.5α], [(R 1 -W B )sin4.5α,(R 1 -W B )cos 4.5α] and [-(R 1 -WB ) sin 4.5α, (R 1 -W B )cos 4.5α];

[0223] Calculate the longitudinal distance W from the second thyristor auxiliary contact to its adjacent inflection point C :

[0224] W C =0.5min(|R 0 -R 3 |,|R 1 -R 3 |,|R 2 -R 3 |,|R 4 -R 3 |)

[0225] According to the longitudinal distance W C Determine the coordinates of each adjacent inflection point of the second thyristor auxiliary contact as [(R 3 +W C )sin 4.5α, (R 3 +W C )cos 4.5α], [-(R 3 +W C )sin 4.5α, (R 3+W C )cos 4.5α], [(R 3 -W C )sin4.5α,(R 3 -W C )cos 4.5α] and [-(R 3 -W C )sin 4.5α, (R 3 -W C )cos 4.5α];

[0226] Calculate the longitudinal distance W from the first thyristor trigger contact to its adjacent inflection point D :

[0227] W D =0.5min(|R 0 -R 2 |,|R 1 -R 2 |,|R 3 -R 2 |,|R 4 -R 2 |)

[0228] According to the longitudinal distance W D Determine the coordinates of each adjacent inflection point of the first thyristor trigger contact as [(R 2 +W D )sin 3.5α, (R 2 +W D )cos 3.5α], [-(R 2 +W D )sin 3.5α, (R 2 +W D )cos 3.5α], [(R 2 -W D )sin 3.5α, (R 2 -W D )cos 3.5α] and -[(R 2 -W D )sin 3.5α, (R 2 -W D )cos 3.5α];

[0229] Calculate the longitudinal distance W from the second thyristor trigger contact to its adjacent inflection point E :

[0230] W E =0.5min(|R 0 -R 4 |,|R 1 -R4 |,|R 3 -R 4 |,|R 3 -R 4 |)

[0231] According to the longitudinal distance W E Determine the coordinates of each adjacent inflection point of the first thyristor trigger contact as [(R 4 +W E )sin 3.5α, (R 4 +W E )cos 3.5α], [-(R 4 +W E )sin 3.5α, (R 4 +W E )cos 3.5α], [(R 4 -W E )sin3.5α,(R 4 -W E )cos 3.5α] and [-(R 4 -W E )sin 3.5α, (R 4 -W E )cos 3.5α].

[0232] In one achievable manner, the calculating of the minimum distance between static contacts at different gear positions includes:

[0233] Calculate the minimum distance between adjacent stationary contacts:

[0234]

[0235] Where, L A is the minimum distance between adjacent static contacts;

[0236] Calculate the minimum distance between the static contacts in the limit gear:

[0237]

[0238] Where, L B It is the minimum distance between the static contacts in the limit gear position.

[0239] In the above-mentioned embodiment of the present invention, specific calculation formulas are given for the spatial position coordinates, closed trajectory arc and adjacent inflection point coordinates of each moving contact, as well as a calculation formula for the minimum distance between static contacts of different gears. The specific values ​​of various contact parameters are determined according to the given calculation formulas. The method is simple and convenient, and can ensure the efficiency of contact structure design.

[0240] Step S5, determining the shape of the static contact electrode according to the coordinates of the adjacent inflection points of each of the moving contacts.

[0241] Specifically, each adjacent inflection point can be calibrated by the coordinates of the adjacent inflection points, and the shape of the static contact electrode can be drawn by connecting each adjacent inflection point in sequence.

[0242] It should be noted that, as a further improvement of the present application, after executing steps S1-S5, the average electric field strength between the contact electrodes can be further calculated according to the insulation voltage of the tap changer. The contact shape can also be fine-tuned according to factors such as the conduction characteristics of the thyristor, the processing performance of the parts, and the material of the contact electrodes.

[0243] A second aspect of the present invention provides a device for designing the contact structure of a power electronic tap changer of a distribution transformer.

[0244] See also Figure 4 , Figure 4 A structural connection block diagram of a device for designing a contact structure of a power electronic tap changer of a distribution transformer provided by an embodiment of the present invention is shown.

[0245] An embodiment of the present invention provides a device for designing a contact structure of a power electronic tap changer of a distribution transformer, comprising:

[0246] An acquisition module 1 is used to acquire the switching action timing information and the maximum number of tapping gears of the power electronic tap changer of the distribution transformer;

[0247] A first determination module 2 is used to analyze the relative position relationship between the moving contacts according to the switching action timing information, and determine the spatial arrangement of the moving contacts according to the relative position relationship analysis results;

[0248] A second determination module 3 is used to determine parameter setting requirements according to the spatial arrangement of the moving contacts, and determine a moving contact radius parameter value that meets the parameter setting requirements, wherein the moving contact radius parameter value includes a position radius and a contact radius of each moving contact;

[0249] A calculation module 4 is used to calculate the angle that the moving contact rotates during the state switching process according to the maximum tapping gear number, calculate the spatial position coordinates, closed trajectory arc and adjacent inflection point coordinates of each moving contact according to the moving contact radius parameter value and the angle, and calculate the minimum distance between static contacts in different gears;

[0250] The third determination module 5 is used to determine the shape of the static contact electrode according to the coordinates of the adjacent inflection points of each of the moving contacts.

[0251] In one achievable manner, the first determining module 2 includes:

[0252] The first determination unit is used to match the corresponding moving contact space arrangement mode from the moving contact space arrangement mode library according to the relative position relationship analysis result, and the moving contact space arrangement mode library stores multiple moving contact space arrangement modes and associated relative position relationship feature information for matching.

[0253] In one achievable manner, the second determining module 3 includes:

[0254] A second determination unit is used to determine whether the two thyristor trigger contacts share a closing trajectory according to the spatial arrangement of the moving contacts, and to determine whether the two thyristor auxiliary contacts share a closing trajectory;

[0255] a third determining unit, configured to determine, if the two thyristor trigger contacts share a closed trajectory and the two thyristor auxiliary contacts share a closed trajectory, that the parameter setting requirement consists of a first parameter setting constraint, a second parameter setting constraint and a third parameter setting constraint;

[0256] a fourth determining unit, configured to determine, if the two thyristor trigger contacts do not share a closing trajectory and the two thyristor auxiliary contacts share a closing trajectory, that the parameter setting requirement consists of a first parameter setting constraint, a third parameter setting constraint and a fourth parameter setting constraint;

[0257] a fifth determining unit, configured to determine, if the two thyristor trigger contacts share a closing trajectory and the two thyristor auxiliary contacts do not share a closing trajectory, that the parameter setting requirement consists of a first parameter setting constraint, a second parameter setting constraint and a fifth parameter setting constraint;

[0258] a sixth determining unit, configured to determine, if the two thyristor trigger contacts do not share a closed trajectory and the two thyristor auxiliary contacts do not share a closed trajectory, that the parameter setting requirement consists of a first parameter setting constraint, a third parameter setting constraint and a fifth parameter setting constraint;

[0259] Wherein, the first parameter setting constraint is:

[0260]

[0261] The second parameter sets the constraints as:

[0262]

[0263] The third parameter setting constraint is:

[0264]

[0265] The fourth parameter setting constraint is:

[0266]

[0267] The fifth parameter sets the constraints as follows:

[0268]

[0269] In the formula, R 0 The radius of the main contact, R 1 is the location radius of the first thyristor auxiliary contact, R 2 is the radius of the first thyristor trigger contact, R 3 is the location radius of the second thyristor auxiliary contact, R 4 is the radius of the second thyristor trigger contact, r 0 The contact radius of the main contact, r 1 is the contact radius of the first thyristor auxiliary contact, r 2 is the contact radius of the first thyristor trigger contact, r 3 is the contact radius of the second thyristor auxiliary contact, r 4 is the contact radius of the second thyristor trigger contact.

[0270] In one achievable manner, the calculation module 4 includes:

[0271] The first calculation unit is used to calculate the central angle of adjacent tap positions according to the maximum tapping gear number:

[0272]

[0273] In the formula, It represents the center angle between adjacent tap positions, and N is the maximum number of tap positions;

[0274] The second calculation unit is used to calculate the angle that the moving contact rotates during the state switching process according to the central angle of the adjacent tap positions:

[0275]

[0276] Where α represents the angle that the moving contact rotates during the state switching process, and M is the number of switching actions included in the state switching process of the power electronic tap changer of the distribution transformer.

[0277] In one achievable manner, the calculation module 4 further includes:

[0278] The third computing unit is used to calculate (0, R 0 ) as the spatial position coordinate of the main contact, and (R 1 sin 2α, R 1 cos 2α) as the spatial position coordinate of the first thyristor auxiliary contact, and (-R 3sin 2α, R 3 cos 2α) as the spatial position coordinate of the second thyristor auxiliary contact, and (R 2 sin 2α, R 2 cos 2α) as the spatial position coordinate of the first thyristor trigger contact, and (-R 4 sin 2α, R 4 cos 2α) as the spatial position coordinates of the second thyristor trigger contact.

[0279] In one achievable manner, the calculation module 4 further includes:

[0280] The fourth calculation unit is used to calculate the closing trajectory arc of the main contact:

[0281]

[0282] The fifth calculation unit is used to calculate the closing trajectory arc of the first thyristor auxiliary contact:

[0283] Arc(x, y), x = (-R 1 sin 4.5α, R 1 cos 4.5α), y=(R 1 sin 4.5α, R 1 cos 4.5α)

[0284] The sixth calculation unit is used to calculate the closing trajectory of the second thyristor auxiliary contact:

[0285] Arc(x, y), x = (-R 3 sin 4.5α, R 3 cos 4.5α), y=(R 3 sin 4.5α.R 3 cos 4.5α)

[0286] The seventh calculation unit is used to calculate the closing trajectory arc of the first thyristor trigger contact:

[0287] Arc(x, y), x = (-R 2 sin 3.5α, R 2 cos 3.5α), y=(R 2 sin 3.5α, R 2 cos 3.5α)

[0288] An eighth calculation unit is used to calculate the closing trajectory arc of the second thyristor trigger contact:

[0289] Arc(x, y), x = (-R4 sin 3.5α, R 4 cos 3.5α), y=(R 4 sin 3.5α, R 4 cos 3.5α)

[0290] Wherein, Arc(x, y) represents the arc between point x and point y with the coordinate origin as the center.

[0291] In one achievable manner, the calculation module 4 further includes:

[0292] The ninth calculation unit is used to calculate the longitudinal distance W from the main contact to its adjacent inflection point. A :

[0293] W A =0.5min(|R 1 -R 0 |,|R 2 -R 0 |,|R 3 -R 0 |,|R 4 -R 0 |)

[0294] A seventh determining unit is configured to determine the longitudinal distance W according to the longitudinal distance W. A Determine the coordinates of each adjacent inflection point of the main contact as and

[0295] A tenth calculation unit is used to calculate the longitudinal distance W from the first thyristor auxiliary contact to its adjacent inflection point. B :

[0296] W B =0.5min(|R 0 -R 1 |,|R 2 -R 1 |,|R 3 -R 1 |,|R 4 -R 1 |)

[0297] An eighth determining unit is configured to determine the longitudinal distance W according to the longitudinal distance W. B Determine the coordinates of each adjacent inflection point of the first thyristor auxiliary contact as [(R 1 +W B )sin 4.5α, (R 1 +W B)cos 4.5α], [-(R 1 +W B )sin 4.5α, (R 1 +W B )cos 4.5α], [(R 1 -W B )sin 4.5α, (R 1 -W B )cos 4.5α] and [-(R 1 -W B )sin 4.5α, (R 1 -W B )cos 4.5α];

[0298] The eleventh calculation unit is used to calculate the longitudinal distance W from the second thyristor auxiliary contact to its adjacent inflection point. C :

[0299] W C =0.5min(|R 0 -R 3 |,|R 1 -R 3 |,|R 2 -R 3 |,|R 4 -R 3 |)

[0300] A ninth determining unit is configured to determine the longitudinal distance W according to the longitudinal distance W. C Determine the coordinates of each adjacent inflection point of the second thyristor auxiliary contact as [(R 3 +W C )sin 4.5α, (R 3 +W C )cos 4.5α], [-(R 3 +W C )sin 4.5α, (R 3 +W C )cos 4.5α], [(R 3 -W C )sin 4.5α, (R 3 -W C )cos 4.5α] and [-(R 3 -W C )sin 4.5α, (R 3 -W C )cos 4.5α];

[0301] The twelfth calculation unit is used to calculate the longitudinal distance W from the first thyristor trigger contact to its adjacent inflection point D:

[0302] W D =0.5min(|R 0 -R 2 |,|R 1 -R 2 |,|R 3 -R 2 |,|R 4 -R 2 |)

[0303] A tenth determining unit is configured to determine the longitudinal distance W according to the longitudinal distance W. D Determine the coordinates of each adjacent inflection point of the first thyristor trigger contact as [(R 2 +W D )sin 3.5α, (R 2 +W D )cos 3.5α], [-(R 2 +W D )sin 3.5α, (R 2 +W D )cos 3.5α], [(R 2 -W D )sin 3.5α, (R 2 -W D )cos 3.5α] and -[(R 2 -W D )sin 3.5α, (R 2 -W D )cos 3.5α];

[0304] The thirteenth calculation unit is used to calculate the longitudinal distance W from the second thyristor trigger contact to its adjacent inflection point. E :

[0305] W E =0.5min(|R 0 -R 4 |,|R 1 -R 4 |,|R 3 -R 4 |,|R 3 -R 4 |)

[0306] The eleventh determining unit is configured to determine the longitudinal distance W according to the longitudinal distance W. E Determine the coordinates of each adjacent inflection point of the first thyristor trigger contact as [(R 4 +W E )sin 3.5α, (R 4 +W E)cos 3.5α], [-(R 4 +W E )sin 3.5α, (R 4 +W E )cos3.5α], [(R 4 -W E )sin 3.5α, (R 4 -W E )cos 3.5α] and [-(R 4 -W E )sin 3.5α, (R 4 -W E )cos 3.5α].

[0307] In one achievable manner, the calculation module 4 further includes:

[0308] The fourteenth calculation unit is used to calculate the minimum distance between adjacent static contacts:

[0309]

[0310] Where, L A is the minimum distance between adjacent static contacts;

[0311] The fifteenth calculation unit is used to calculate the minimum distance between the static contacts at the limit gear position:

[0312]

[0313] Where, L B It is the minimum distance between the static contacts in the limit gear position.

[0314] A third aspect of the present invention provides a device for designing a contact structure of a power electronic tap changer of a distribution transformer, comprising:

[0315] A memory for storing instructions; wherein the instructions are used to implement the method for designing a contact structure of a power electronic tap changer of a distribution transformer as described in any one of the above embodiments;

[0316] A processor is used to execute instructions in the memory.

[0317] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for designing a contact structure of a power electronic tap changer of a distribution transformer as described in any one of the above embodiments is implemented.

[0318] The above-mentioned embodiments of the present invention are designs of the contact structure of the power electronic tap changer of the distribution transformer. According to the method of the present invention, the specific values ​​of various contact parameters can be determined quickly and effectively.

[0319] Technical personnel in the relevant field can clearly understand that, for the convenience and conciseness of description, the specific working processes of the devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments, and the specific beneficial effects of the devices and modules described above can refer to the corresponding beneficial effects in the aforementioned method embodiments, which will not be repeated here.

[0320] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0321] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0322] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of software functional modules.

[0323] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0324] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for designing a contact structure of a power electronic tap changer for a distribution transformer, wherein the power electronic tap changer contact comprises a plurality of stationary contacts, a main contact, two thyristor trigger contacts and two thyristor auxiliary contacts, wherein the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts are all movable contacts, and wherein: The method comprises: Obtain the switching action timing information and maximum number of tapping levels of the power electronic tap changer of the distribution transformer; Analyze the relative position relationship between the moving contacts according to the switching action timing information, and determine the spatial arrangement of the moving contacts according to the relative position relationship analysis results; Determine parameter setting requirements according to the spatial arrangement of the moving contacts, and determine moving contact radius parameter values ​​that meet the parameter setting requirements, wherein the moving contact radius parameter values ​​include a position radius and a contact radius of each moving contact; Calculate the angle of the moving contact during the state switching process according to the maximum tapping gear number, calculate the spatial position coordinates, closed trajectory arc and adjacent inflection point coordinates of each moving contact according to the moving contact radius parameter value and the angle, and calculate the minimum distance between static contacts at different gears; Determining the shape of the static contact electrode according to the coordinates of the adjacent inflection points of each of the moving contacts; The step of calculating the angle of rotation of the moving contact during the state switching process according to the maximum number of tapping gears includes: Calculate the center angle of adjacent tap positions according to the maximum tapping number: ； In the formula, Indicates the center angle of adjacent tap positions, is the maximum number of tapping gears; The angle that the moving contact rotates during the state switching process is calculated based on the center angle of the adjacent tap positions: ； In the formula, Indicates the angle that the moving contact rotates during the state switching process. The number of switching actions included in the state switching process of the power electronic tap changer of the distribution transformer; The calculating of the spatial position coordinates, the closed trajectory arc and the adjacent inflection point coordinates of each of the moving contacts according to the moving contact radius parameter value and the angle comprises: by As the spatial position coordinates of the main contact, As the spatial position coordinates of the first thyristor auxiliary contact, As the spatial position coordinates of the second thyristor auxiliary contact, As the spatial coordinates of the first thyristor trigger contact, As the spatial position coordinates of the second thyristor trigger contact; in, is the location radius of the main contact, is the location radius of the first thyristor auxiliary contact, is the radius of the first thyristor trigger contact, is the location radius of the second thyristor auxiliary contact, is the location radius of the second thyristor trigger contact; The step of calculating the spatial position coordinates, closed trajectory arc and adjacent inflection point coordinates of each moving contact according to the moving contact radius parameter value and the angle also includes: Calculate the closing trajectory arc of the main contact: ； Calculate the closing trajectory arc of the first thyristor auxiliary contact: ； Calculate the closing trajectory arc of the second thyristor auxiliary contact: ； Calculate the closing trajectory arc of the first thyristor trigger contact: ； Calculate the closing trajectory arc of the second thyristor trigger contact: ； In the formula, Indicates that the origin of the coordinate system is the center of the circle. and Point The arc between The step of calculating the spatial position coordinates, closed trajectory arc and adjacent inflection point coordinates of each moving contact according to the moving contact radius parameter value and the angle also includes: Calculate the longitudinal distance from the main contact to its adjacent inflection point : ； According to the longitudinal distance Determine the coordinates of each adjacent inflection point of the main contact as 、 、 and ; Calculate the longitudinal distance from the first thyristor auxiliary contact to its adjacent inflection point : ； According to the longitudinal distance Determine the coordinates of each adjacent inflection point of the first thyristor auxiliary contact as , , and ; Calculate the longitudinal distance from the second thyristor auxiliary contact to its adjacent inflection point : ； According to the longitudinal distance Determine the coordinates of each adjacent inflection point of the second thyristor auxiliary contact as 、 、 and ; Calculate the longitudinal distance from the first thyristor trigger contact to its adjacent inflection point : ； According to the longitudinal distance Determine the coordinates of each adjacent inflection point of the first thyristor trigger contact as 、 、 and ; Calculate the longitudinal distance from the second thyristor trigger contact to its adjacent inflection point : ； According to the longitudinal distance Determine the coordinates of each adjacent inflection point of the first thyristor trigger contact as 、 、 and .

2. The method for designing the contact structure of a power electronic tap changer of a distribution transformer according to claim 1, characterized in that: Determining the spatial arrangement of the moving contacts according to the obtained relative position relationship analysis results includes: According to the relative position relationship analysis result, a corresponding moving contact space arrangement mode is matched from a moving contact space arrangement mode library, wherein the moving contact space arrangement mode library stores a plurality of moving contact space arrangement modes and associated relative position relationship feature information for matching.

3. The method for designing the contact structure of a power electronic tap changer of a distribution transformer according to claim 1, characterized in that: The step of determining parameter setting requirements according to the spatial arrangement of the moving contacts includes: Determining whether two thyristor trigger contacts share a closing track according to the spatial arrangement of the moving contacts, and determining whether two thyristor auxiliary contacts share a closing track; If the two thyristor trigger contacts share a closed trajectory and the two thyristor auxiliary contacts share a closed trajectory, determining that the parameter setting requirement consists of a first parameter setting constraint, a second parameter setting constraint and a third parameter setting constraint; If the two thyristor trigger contacts do not share a closed trajectory and the two thyristor auxiliary contacts share a closed trajectory, determining that the parameter setting requirement consists of a first parameter setting constraint, a third parameter setting constraint, and a fourth parameter setting constraint; If the two thyristor trigger contacts share a closed trajectory and the two thyristor auxiliary contacts do not share a closed trajectory, determining that the parameter setting requirement consists of a first parameter setting constraint, a second parameter setting constraint, and a fifth parameter setting constraint; If the two thyristor trigger contacts do not share a closed trajectory and the two thyristor auxiliary contacts do not share a closed trajectory, determining that the parameter setting requirement consists of a first parameter setting constraint, a third parameter setting constraint and a fifth parameter setting constraint; Wherein, the first parameter setting constraint is: ； The second parameter setting constraint is: ； The third parameter setting constraint is: ； The fourth parameter setting constraint is: ； The fifth parameter sets the constraints as follows: ； In the formula, is the location radius of the main contact, is the location radius of the first thyristor auxiliary contact, is the radius of the first thyristor trigger contact, is the location radius of the second thyristor auxiliary contact, is the location radius of the second thyristor trigger contact, is the contact radius of the main contact, is the contact radius of the first thyristor auxiliary contact, is the contact radius of the first thyristor trigger contact, is the contact radius of the second thyristor auxiliary contact, is the contact radius of the second thyristor trigger contact.

4. The method for designing the contact structure of a power electronic tap changer of a distribution transformer according to claim 1, characterized in that: The calculation of the minimum distance between static contacts at different gear positions includes: Calculate the minimum distance between adjacent stationary contacts: ； In the formula, is the minimum distance between adjacent static contacts; Calculate the minimum distance between the static contacts in the limit gear: ； In the formula, It is the minimum distance between the static contacts in the limit gear position.

5. A distribution transformer power electronic tap switch contact structure design device, used to implement the distribution transformer power electronic tap switch contact structure design method according to any one of claims 1 to 4, the power electronic tap switch contact comprises a plurality of stationary contacts, a main contact, two thyristor trigger contacts and two thyristor auxiliary contacts, the one main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts are all moving contacts, characterized in that: The device comprises: An acquisition module is used to obtain the switching action timing information and the maximum number of tapping gears of the power electronic tap changer of the distribution transformer; A first determination module is used to analyze the relative position relationship between the moving contacts according to the switching action timing information, and determine the spatial arrangement of the moving contacts according to the relative position relationship analysis result; A second determination module is used to determine parameter setting requirements according to the spatial arrangement of the moving contacts, and determine a moving contact radius parameter value that meets the parameter setting requirements, wherein the moving contact radius parameter value includes a position radius and a contact radius of each moving contact; A calculation module, used to calculate the angle of rotation of the moving contact during the state switching process according to the maximum tapping gear number, calculate the spatial position coordinates, closed trajectory arc and adjacent inflection point coordinates of each moving contact according to the moving contact radius parameter value and the angle, and calculate the minimum distance between static contacts of different gears; The third determination module is used to determine the shape of the static contact electrode according to the coordinates of the adjacent inflection points of each of the moving contacts.

6. A device for designing the contact structure of a power electronic tap changer of a distribution transformer, characterized in that: include: A memory for storing instructions; wherein the instructions are used to implement the method for designing the contact structure of a power electronic tap changer of a distribution transformer according to any one of claims 1 to 4; A processor is used to execute instructions in the memory.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for designing a contact structure of a power electronic tap changer of a distribution transformer according to any one of claims 1 to 4 is implemented.

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