Gear adjusting method and device of phase-shifting transformer, terminal equipment and storage medium

Abstract

The invention discloses a gear adjusting method and device of a phase-shifting transformer, terminal equipment and a storage medium, and belongs to the field of power systems, and the phase-shifting transformer used by the method can realize multi-combination adjustability of a primary winding and a secondary winding by setting gears with unequal turns on the primary winding. The method comprises the following steps: determining a target turn ratio and a target adjusting direction according to a compensation voltage value and a primary winding voltage value; and adjusting the first gear switch and the second gear switch of the corresponding phase according to the target turn ratio and the target adjustment direction. Based on the multi-combination adjustable gear adjusting mode of the primary winding and the secondary winding, the adjusting flexibility and the adjusting precision are improved. Therefore, the problems of poor adjustment flexibility, few gear combinations, narrow application range and poor adjustment precision in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the field of power systems, and in particular to a gear adjustment method, device, terminal equipment and storage medium for a phase-shifting transformer. Background Art

[0002] With the continuous growth of electricity demand and the acceleration of power grid construction, the performance requirements for power equipment are also constantly increasing. As a new type of power conversion device for controlling power flow in power systems, phase-shifting transformers have demonstrated unique advantages in power transmission and regulation. The optimization and innovation of their performance are particularly important. Phase-shifting transformers (PSTs) are a type of functional transformer that control the active power flow in three-phase transmission networks by changing the voltage phase angle difference between system nodes.

[0003] Compared to traditional dual-body structures, single-core asymmetric phase-shifting transformers simplify the number of windings and implement clearer and stricter wiring specifications, significantly reducing the difficulty of transformer manufacturing and design. This design not only improves the transformer's overall performance and adjustability, but also enhances its adaptability to load changes. When faced with power load fluctuations or changes, the system can quickly adjust its state to ensure a balanced and secure power supply. Because the on-load tap changers of single-core asymmetric phase-shifting transformers are connected in series within the line, this structure is suitable for medium and low voltage transmission and distribution scenarios. It can effectively reduce the space occupied by equipment and the overall weight, thereby reducing construction and maintenance costs.

[0004] Although the existing single-core asymmetric phase-shifting transformer plays an important role in the power system, since its primary winding is not divided into gears, that is, the primary winding is not adjustable, there are still many problems such as poor adjustment flexibility, few gear combinations, narrow application range, and poor adjustment accuracy. Summary of the Invention

[0005] The present invention provides a gear adjustment method, device, terminal equipment and storage medium for a phase-shifting transformer, which can solve the problems of poor adjustment flexibility, few gear combinations, narrow application range and poor adjustment accuracy of the phase-shifting transformer in the prior art.

[0006] An embodiment of the present invention provides a method for adjusting the gear position of a phase-shifting transformer, characterized in that the phase-shifting transformer includes: a phase A primary winding, a phase B primary winding, a phase C primary winding, a phase A secondary winding, a phase B secondary winding, a phase C secondary winding, a plurality of first gear switches, and a plurality of second gear switches; wherein the second gear switches are classified according to adjustment direction, including: a positive gear switch, a negative gear switch, and a zero gear switch;

[0007] The A-phase primary winding, the B-phase primary winding, and the C-phase primary winding are connected in a triangle; the angular lead wire between the A-phase primary winding and the B-phase primary winding is connected to the C-phase secondary winding and the C-phase circuit; the angular lead wire between the B-phase primary winding and the C-phase primary winding is connected to the A-phase secondary winding and the A-phase circuit; the angular lead wire between the A-phase primary winding and the C-phase primary winding is connected to the B-phase secondary winding and the B-phase circuit; the A-phase primary winding, the B-phase primary winding, and the C-phase primary winding are each provided with a plurality of first-gear switches; the A-phase secondary winding, the B-phase secondary winding, and the C-phase secondary winding are each provided with a plurality of positive-gear switches, a plurality of negative-gear switches, and a zero-gear switch;

[0008] The gear adjustment method of the phase-shifting transformer includes:

[0009] For each phase in the three-phase circuit, obtain the corresponding compensation voltage value and primary winding voltage value;

[0010] Determining a target turns ratio and a target adjustment direction of the primary winding and the secondary winding of the corresponding phase of the phase-shifting transformer according to the compensation voltage value and the primary winding voltage value; wherein the target adjustment direction includes: positive adjustment, negative adjustment, and zero adjustment;

[0011] According to the target turns ratio and the target adjustment direction, the first gear switch and the second gear switch of the corresponding phase are adjusted.

[0012] Furthermore, in the A-phase primary winding, the B-phase primary winding, and the C-phase primary winding, the numbers of turns between adjacent first-gear switches are different;

[0013] In the A-phase secondary winding, the B-phase secondary winding, and the C-phase secondary winding, the numbers of turns between adjacent second-gear switches are equal;

[0014] The calculation formula for the number of turns between adjacent first-gear switches is:

[0015]

[0016] Where i represents the gear value of the primary winding, and its value range is {1, 2, ..., m}; m represents the total number of gears of the primary winding; N 1,(i-1,i) Indicates the number of turns between i-1 and i in the primary winding; N s Indicates the effective turns of the primary winding in gear 1.

[0017] Furthermore, determining a target turns ratio and a target adjustment direction of the primary winding and the secondary winding of the corresponding phase of the phase-shifting transformer according to the compensation voltage value and the primary winding voltage value includes:

[0018] Calculating the target turns ratio according to the absolute value of the compensation voltage value and the primary winding voltage value;

[0019] Determine the relationship between the compensation voltage value and 0; if the compensation voltage value is greater than 0, determine that the target adjustment direction is positive adjustment; if the compensation voltage value is less than 0, determine that the target adjustment direction is negative adjustment; if the compensation voltage value is equal to 0, determine that the target adjustment direction is negative adjustment.

[0020] Furthermore, the target turns ratio is calculated as follows:

[0021]

[0022] Where a0 represents the target turns ratio; U1 represents the primary winding voltage; ΔU represents the compensation voltage.

[0023] Furthermore, adjusting the first gear switch and the second gear switch of the corresponding phase according to the target turns ratio and the target adjustment direction includes:

[0024] Combining each first gear switch and each second gear switch to obtain a plurality of gear combinations;

[0025] Get the turns ratio of each gear combination and the type of the second gear switch;

[0026] determining, as the target gear combination, a gear combination in which the turns ratio is equal to the target turns ratio and the adjustment direction of the second gear switch conforms to the target adjustment direction;

[0027] The first gear switch and the second gear switch in the target gear combination are turned on, and the remaining first gear switches and second gear switches are turned off.

[0028] Furthermore, obtaining the turns ratio of each gear combination includes:

[0029] For each gear combination, obtaining the number of turns between adjacent first gear switches, the number of turns between adjacent second gear switches, the gear value of the first gear switch in the gear combination, and the gear value of the second gear switch in the gear combination;

[0030] Calculating the effective number of turns of the primary winding corresponding to the gear combination according to the number of turns between adjacent first gear switches and the gear value of the first gear switch in the gear combination;

[0031] Calculating the effective number of turns of the secondary winding corresponding to the gear combination according to the number of turns between adjacent second gear switches and the gear value of the second gear switch in the gear combination;

[0032] The turns ratio of the gear combination is calculated according to the effective turns of the primary winding and the effective turns of the secondary winding.

[0033] Furthermore, the calculation formula for the effective number of turns of the primary winding is:

[0034]

[0035] Where i represents the gear value of the primary winding, that is, the gear value of the first gear switch in the gear combination; N 1,i Indicates the effective number of turns of the primary winding in gear i; N s Indicates the effective number of turns of the primary winding in gear 1; N 1,(i-1,i) It represents the number of turns between gear i-1 and gear i in the primary winding; m represents the total number of gears in the primary winding;

[0036] The calculation formula for the effective number of turns of the secondary winding is:

[0037] N 2,j =(-1) u JN c ;

[0038] Where, j represents the gear value of the secondary winding, that is, the gear value of the second gear switch in the gear combination, and the value range is {-n - ,-n - +1,…,0,…,n + -1,n +};n - Indicates the total number of forward gears; n + Indicates the total number of negative gears; N 2,j Indicates the effective number of turns of the secondary winding in gear j; N c Indicates the number of turns between adjacent second-gear switches; u indicates the conduction state of the negative gear switch, when j ≥ 0, u = 0, when j < 0, u = 1;

[0039] The calculation formula of the turns ratio is:

[0040]

[0041] Where a i,j Indicates the turns ratio of the gear combination where the gear value of the first gear switch is i and the gear value of the second gear switch is j.

[0042] Another embodiment of the present invention further provides a gear adjustment device for a phase-shifting transformer, characterized in that the phase-shifting transformer includes: a phase A primary winding, a phase B primary winding, a phase C primary winding, a phase A secondary winding, a phase B secondary winding, a phase C secondary winding, a plurality of first gear switches, and a plurality of second gear switches; wherein the second gear switches are classified according to adjustment direction, including: a positive gear switch, a negative gear switch, and a zero gear switch;

[0043] The A-phase primary winding, the B-phase primary winding, and the C-phase primary winding are connected in a triangle; the angular lead wire between the A-phase primary winding and the B-phase primary winding is connected to the C-phase secondary winding and the C-phase circuit; the angular lead wire between the B-phase primary winding and the C-phase primary winding is connected to the A-phase secondary winding and the A-phase circuit; the angular lead wire between the A-phase primary winding and the C-phase primary winding is connected to the B-phase secondary winding and the B-phase circuit; the A-phase primary winding, the B-phase primary winding, and the C-phase primary winding are each provided with a plurality of first-gear switches; the A-phase secondary winding, the B-phase secondary winding, and the C-phase secondary winding are each provided with a plurality of positive-gear switches, a plurality of negative-gear switches, and a zero-gear switch;

[0044] The gear adjustment device of the phase-shifting transformer includes: a data acquisition module and a gear adjustment module;

[0045] The data acquisition module is used to obtain the corresponding compensation voltage value and primary winding voltage value for each phase in the three-phase circuit;

[0046] The gear adjustment module is used to determine the target turns ratio and target adjustment direction of the primary winding and secondary winding of the corresponding phase of the phase-shifting transformer based on the compensation voltage value and the primary winding voltage value; wherein the target adjustment direction includes: positive adjustment, negative adjustment and zero adjustment; according to the target turns ratio and the target adjustment direction, adjust the first gear switch and the second gear switch of the corresponding phase.

[0047] Another embodiment of the present invention further provides a terminal device, comprising: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the steps of the gear adjustment method of the phase-shifting transformer of the present invention are implemented.

[0048] Another embodiment of the present invention further provides a computer-readable storage medium item, comprising: a stored computer program, which controls the device where the computer-readable storage medium is located to execute the steps of the gear adjustment method of the phase-shifting transformer of the present invention when the computer program is running.

[0049] The following beneficial effects are achieved by implementing the present invention:

[0050] The phase-shifting transformer used in the present invention achieves adjustable primary and secondary windings in multiple combinations by setting gears with unequal turns in the primary winding. A target turns ratio and target adjustment direction are determined based on the compensation voltage and the primary winding voltage. The first and second gear switches of the corresponding phases are adjusted based on these target turns ratios and target adjustment directions. This present invention improves adjustment flexibility and precision by utilizing a gear adjustment method that allows for multiple combinations of primary and secondary windings, addressing the existing issues of poor adjustment flexibility, limited gear combinations, a narrow application range, and poor adjustment precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0052] Figure 1 Schematic diagram of the structure of a phase-shifting transformer adjusted by the gear adjustment method of the present invention;

[0053] Figure 2 This is a flow chart of a method for adjusting the gear position of a phase-shifting transformer provided by one embodiment of the present invention;

[0054] Figure 3 This is a schematic diagram of the primary winding gear division of a multi-combination adjustable phase-shifting transformer;

[0055] Figure 4 A schematic diagram of the secondary winding gear division of a multi-combination adjustable phase-shifting transformer;

[0056] Figure 5 It is a schematic diagram of voltage regulation;

[0057] Figure 6 This is a voltage regulation diagram when the primary winding is in a certain gear and the secondary winding is in gear 2;

[0058] Figure 7 This is a voltage regulation diagram when the primary winding is in a certain gear and the secondary winding is in -3 gear;

[0059] Figure 8 This is a voltage regulation diagram when the secondary winding is in a forward gear and the primary winding is in gear 2;

[0060] Figure 9 This is a voltage regulation diagram when the secondary winding is in a certain reverse gear and the primary winding is in gear 1;

[0061] Figure 10This is a structural schematic diagram of a gear adjustment device for a phase-shifting transformer provided by one embodiment of the present invention;

[0062] The accompanying drawings in the specification are numerals as follows:

[0063] Phase-shifting transformer 1, A-phase primary winding 11, B-phase primary winding 12, C-phase primary winding 13, A-phase secondary winding 21, B-phase secondary winding 22, C-phase secondary winding 21, first gear switch 31 and second gear switch 32. DETAILED DESCRIPTION

[0064] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the term "include" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0066] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0067] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0068] In the description of the embodiments of the present application, the term "several" refers to more than one (including one).

[0069] In the description of the embodiments of this application, unless otherwise specified or limited, the technical term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication between two components or the interaction between two components. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0070] In order to solve the problems of poor adjustment flexibility, few gear combinations, narrow application range and poor adjustment accuracy of the phase-shifting transformer 1 in the prior art, an embodiment of the present invention provides a gear adjustment method for the phase-shifting transformer 1, which is characterized in that it is used to adjust the gear combination of the phase-shifting transformer 1. Figure 1 The phase-shifting transformer 1 shown, Figure 1 Schematic diagram of the structure of a phase-shifting transformer 1 that needs to be adjusted using the method of the present invention;

[0071] The circuit comprises: an A-phase primary winding 11, a B-phase primary winding 12, a C-phase primary winding 13, an A-phase secondary winding 21, a B-phase secondary winding 22, a C-phase secondary winding 23, a plurality of first-position switches 31, and a plurality of second-position switches 32; wherein the second-position switches 32 are classified according to the adjustment direction, including: a positive position switch, a negative position switch, and a zero position switch; the A-phase primary winding 11, the B-phase primary winding 12, and the C-phase primary winding 13 are connected in a triangle; the angle lead between the A-phase primary winding 11 and the B-phase primary winding 12 is connected to the C-phase secondary winding 23 and the C-phase circuit connection; the angular lead-out line between the B-phase primary winding 12 and the C-phase primary winding 13 is connected to the A-phase secondary winding 21 and the A-phase line; the angular lead-out line between the A-phase primary winding 11 and the C-phase primary winding 13 is connected to the B-phase secondary winding 22 and the B-phase line; the A-phase primary winding 11, the B-phase primary winding 12 and the C-phase primary winding 13 are each provided with a plurality of first gear switches 31; the A-phase secondary winding 21, the B-phase secondary winding 22 and the C-phase secondary winding 23 are each provided with a plurality of positive gear switches, a plurality of negative gear switches and a zero gear switch.

[0072] It should be noted that the phase-shifting transformer 1 includes a three-phase primary winding, a three-phase secondary winding, and several position switches. The three-phase primary winding includes an A-phase primary winding 11, a B-phase primary winding 12, and a C-phase primary winding 13; the three-phase secondary winding includes an A-phase secondary winding 21, a B-phase secondary winding 22, and a C-phase secondary winding 23; the position switches include a first position switch 31 mounted on the primary winding and a second position switch 32 mounted on the secondary winding. The second position switch 32 is categorized by adjustment direction into three types: a positive position switch, a negative position switch, and a zero position switch.

[0073] The three-phase primary windings are connected in a triangle, with each corner lead connected to the three-phase circuit. The three-phase secondary windings are directly connected in series to the circuit to provide compensation voltage for the three-phase circuit. The secondary winding of each phase is in phase with the primary winding not directly connected to it.

[0074] Both the primary and secondary windings have multiple terminals, each representing a gear position. Different gear positions correspond to different compensation voltages, which are adjusted using the gear adjustment switch. The compensation voltage is the secondary winding voltage, while the primary winding voltage is the excitation voltage.

[0075] In a preferred embodiment, in the A-phase primary winding 11, the B-phase primary winding 12, and the C-phase primary winding 13, the numbers of turns between adjacent first-gear switches 31 are different;

[0076] In the A-phase secondary winding 21 , the B-phase secondary winding 22 , and the C-phase secondary winding 23 , the numbers of turns between adjacent second-gear switches 32 are equal;

[0077] The calculation formula for the number of turns between adjacent first gear switches 31 is:

[0078]

[0079] Where i represents the gear value of the primary winding, and its value range is {1, 2, ..., m}; m represents the total number of gears of the primary winding; N 1,(i-1,i) Indicates the number of turns between i-1 and i in the primary winding; N s Indicates the effective turns of the primary winding in gear 1.

[0080] It should be noted that the line voltage regulation principle of the phase-shifting transformer 1 is: take any phase as an example, assuming that the effective number of turns of the primary winding of this phase is N 1,i , i represents the gear value of the primary winding, and the effective number of turns of the secondary winding of this phase is N 2,j , j represents the gear value of the secondary winding. According to the transformer transformation relationship:

[0081]

[0082] Where U1 is the primary winding voltage of the phase, and ΔU is the secondary winding voltage of the phase, that is, the compensation voltage of the phase.

[0083] As can be seen from the above formula, the line voltage can be controlled by adjusting the effective turns of the primary and secondary windings. Increasing the effective turns of the primary winding reduces the compensation voltage, while increasing the effective turns of the secondary winding increases the compensation voltage. The effective turns are the number of turns connected to the line and the number of turns involved in voltage transmission.

[0084] like Figure 5 As shown in the figure, it is a voltage regulation diagram. Taking phase A as an example, the input voltage U of the phase-shifting transformer 1 is S And the output voltage U LA The relationship can be expressed as:

[0085]

[0086] Where, ΔU A Indicates the voltage value of the secondary winding of phase A, that is, the compensation voltage value of phase A; U SC Indicates the C-phase input voltage; U SB Indicates the B-phase input voltage; U SA Indicates the input voltage of phase A; U 1A Indicates the A-phase primary winding voltage value.

[0087] As can be seen from the above formula, the line voltage can be controlled by adjusting the effective turns of the primary and secondary windings. Increasing the effective turns of the primary winding reduces the compensation voltage, while increasing the effective turns of the secondary winding increases the compensation voltage. The effective turns are the number of turns connected to the line and the number of turns involved in voltage transmission.

[0088] The gear position of the primary winding of the phase-shifting transformer 1 affects the amplitude of the voltage regulated by the gear position of the secondary winding. The principle is as follows:

[0089] Taking phase A as an example, assuming that the primary winding gear is gear i, that is, the effective number of turns of the primary winding is N 1,i , the secondary winding gear is gear j, that is, the effective number of turns of the secondary winding is N 2,j , then according to the transformer transformation relationship:

[0090]

[0091] Since the input voltage U SC and U SB The amplitude and phase remain unchanged, then U SC -U SB When the primary winding gear is i-1 gear, that is, the effective number of turns of the primary winding is N 1,i-1When the secondary winding gear increases from j-1 gear to j gear, the effective number of turns of the secondary winding increases from N 2,j-1 Increase to N 2,j The increased compensation voltage ΔU A1 It can be expressed as:

[0092]

[0093] When the primary winding gear increases from gear i-1 to gear i, that is, the effective number of turns of the primary winding increases from N 1,i-1 Increased to N 1,i When the secondary winding gear increases from j-1 gear to j gear, the effective number of turns of the secondary winding increases from N 2,j-1 Increase to N 2,j The added compensation voltage can be expressed as:

[0094]

[0095] Then we have:

[0096] ΔU A2 <ΔU A1 ;

[0097] Therefore, increasing the primary winding gear will make the amplitude of the voltage changed by each gear of the secondary winding smaller, and reducing the primary winding gear will make the amplitude of the voltage changed by each gear of the secondary winding larger.

[0098] The gear position of the secondary winding of the phase-shifting transformer 1 will affect the voltage adjusted by the gear position of the primary winding. The influence principle is: taking phase A as an example, increasing the gear position of the secondary winding will increase the effective number of turns of the secondary winding. When the gear position of the secondary winding is j-1 and the effective number of turns of the secondary winding is N 2,j-1 When the primary winding gear increases from gear i-1 to gear i, and the effective number of turns of the primary winding increases from N 1,i-1 Increase to N 1,i The changed compensation voltage can be expressed as:

[0099]

[0100] When the secondary winding gear is increased from j-1 gear to j gear, and the effective number of turns of the secondary winding is increased from N 2,j-1 Increased to N 2,j When the primary winding gear increases from gear i-1 to gear i, and the effective number of turns of the primary winding increases from N 1,i-1 Increase to N 1,i The added compensation voltage can be expressed as:

[0101]

[0102] Then we have:

[0103] ΔUA3 <ΔU A4 ;

[0104] Therefore, increasing the secondary winding gear will increase the amplitude of the voltage changed by each gear of the primary winding, and reducing the secondary winding gear will reduce the amplitude of the voltage changed by each gear of the primary winding.

[0105] In order to solve the problem of adjustment flexibility, the number of turns of the primary winding between adjacent gears is not equal, such as Figure 3 As shown; the primary winding and secondary winding of the multi-combination adjustable phase-shifting transformer 1 are adjustable, and the number of turns of the secondary winding between adjacent gears is equal, such as Figure 4 shown.

[0106] The principle of the winding gear division of the adjustable phase-shifting transformer 1 is that when the primary winding is in a certain gear and does not shift gears, the compensation voltage amplitude changed by each gear adjustment of the secondary winding is equal; when the secondary winding is in a certain gear and does not shift gears, the compensation voltage amplitude changed by each gear adjustment of the primary winding is equal.

[0107] Taking phase A as an example, when the primary winding is in gear i and remains unchanged, the number of turns between adjacent gears of the secondary winding is N. c , then the compensation voltage that changes when the secondary winding changes one gear can be expressed as:

[0108]

[0109] When the secondary winding is in gear j and remains unchanged, the compensation voltage that changes when the primary winding changes gear can be expressed as:

[0110]

[0111] If you want to make the compensation voltage of the primary winding constant when it is adjusted to one gear, that is, ΔU A2 ′ is a constant value, then The primary winding does not have a 0 gear, and the effective number of turns when the primary winding is in gear 1 is N. s , the primary winding has a total of m gears, then the number of turns between gear i and gear i-1 is:

[0112]

[0113] Divide the primary winding into gears according to the above formula, and the The demand for a fixed value.

[0114] In summary, the number of turns of the secondary winding of the phase-shifting transformer 1 between adjacent gears is equal, and when the primary winding gear is fixed, the line voltage amplitude changed by each adjustment of the secondary winding is equal; the number of turns of the primary winding of the phase-shifting transformer 1 between adjacent gears is not equal, and when the secondary winding gear is fixed, the line voltage amplitude changed by each adjustment is also equal.

[0115] The gear adjustment method of the phase-shifting transformer 1 includes:

[0116] S1. For each phase in the three-phase circuit, obtain the corresponding compensation voltage value and primary winding voltage value.

[0117] S2. Determine the target turns ratio and target adjustment direction of the primary winding and secondary winding of the corresponding phase of the phase-shifting transformer 1 according to the compensation voltage value and the primary winding voltage value; wherein the target adjustment direction includes: positive adjustment, negative adjustment and zero adjustment.

[0118] In a preferred embodiment, determining the target turns ratio and target adjustment direction of the primary winding and the secondary winding of the corresponding phase of the phase-shifting transformer 1 according to the compensation voltage value and the primary winding voltage value includes:

[0119] Calculating the target turns ratio according to the absolute value of the compensation voltage value and the primary winding voltage value;

[0120] Determine the relationship between the compensation voltage value and 0; if the compensation voltage value is greater than 0, determine that the target adjustment direction is positive adjustment; if the compensation voltage value is less than 0, determine that the target adjustment direction is negative adjustment; if the compensation voltage value is equal to 0, determine that the target adjustment direction is negative adjustment.

[0121] In a preferred embodiment, the target turns ratio is calculated as follows:

[0122]

[0123] Where a0 represents the target turns ratio; U1 represents the primary winding voltage; and ΔU represents the compensation voltage.

[0124] S3. Adjust the first gear switch 31 and the second gear switch 32 of the corresponding phase according to the target turns ratio and the target adjustment direction.

[0125] In a preferred embodiment, adjusting the first gear switch 31 and the second gear switch 32 of the corresponding phase according to the target turns ratio and the target adjustment direction includes:

[0126] Combining each first gear position switch 31 with each second gear position switch 32 to obtain a plurality of gear position combinations;

[0127] Obtain the turns ratio of each gear combination and the type of the second gear switch 32;

[0128] Determine a gear combination in which the turns ratio is equal to the target turns ratio and the adjustment direction of the second gear switch 32 is consistent with the target adjustment direction, as the target gear combination;

[0129] The first gear position switch 31 and the second gear position switch 32 in the target gear position combination are turned on, and the other first gear position switches 31 and the second gear position switches 32 are turned off.

[0130] In a preferred embodiment, obtaining the turns ratio of each gear combination includes:

[0131] For each gear combination, obtain the number of turns between adjacent first gear switches 31, the number of turns between adjacent second gear switches 32, the gear value of the first gear switch 31 in the gear combination, and the gear value of the second gear switch 32 in the gear combination;

[0132] Calculate the effective number of turns of the primary winding corresponding to the gear combination according to the number of turns between adjacent first gear switches 31 and the gear value of the first gear switch 31 in the gear combination;

[0133] Calculate the effective number of turns of the secondary winding corresponding to the gear combination according to the number of turns between adjacent second gear switches 32 and the gear value of the second gear switch 32 in the gear combination;

[0134] The turns ratio of the gear combination is calculated according to the effective turns of the primary winding and the effective turns of the secondary winding.

[0135] Assume the primary winding has m first-position switches 31 and no zero position; the secondary winding has 2n+1 second-position switches 32, specifically n positive switches, n negative switches, and 1 zero switch. Thus, there are m(2n+1) primary and secondary position combinations. Example: Assume m=3 and n=3. The primary winding has three positions: 1, 2, and 3, and the secondary winding has seven positions: -3, -2, -1, 0, 1, 2, and 3. There are 21 position combinations, as shown in the table below. The first element is the primary winding position value, and the second element is the secondary winding position value.

[0136]

[0137] In a preferred embodiment, the calculation formula for the effective number of turns of the primary winding is:

[0138]

[0139] Wherein, i represents the gear value of the primary winding, that is, the gear value of the first gear switch 31 in the gear combination; N 1,i Indicates the effective number of turns of the primary winding in gear i; N s Indicates the effective number of turns of the primary winding in gear 1; N 1,(i-1,i) It represents the number of turns between gear i-1 and gear i in the primary winding; m represents the total number of gears in the primary winding;

[0140] The calculation formula for the effective number of turns of the secondary winding is:

[0141] N 2,j =(-1) u JN c ;

[0142] Wherein, j represents the gear value of the secondary winding, that is, the gear value of the second gear switch 32 in the gear combination, and the value range is {-n - ,-n - +1,…,0,…,n + -1,n +};n - Indicates the total number of forward gears; n + Indicates the total number of negative gears; N 2,j Indicates the effective number of turns of the secondary winding in gear j; N c represents the number of turns between adjacent second gear switches 32; u represents the conduction state of the negative gear switch, when j≥0, u=0, when j<0, u=1;

[0143] The calculation formula of the turns ratio is:

[0144]

[0145] Where a i,j The turns ratio represents the gear position combination in which the gear position value of the first gear position switch 31 is i and the gear position value of the second gear position switch 32 is j.

[0146] It should be noted that there are m gears in the primary winding, of which the effective number of turns connected to gear 1 is N. s , the number of turns between gear 1 and gear 2 is N 1,(1,2) , the number of turns between gear 2 and gear 3 is N 1,(2,3) , and so on, the number of turns between m-1 gear and m gear is N 1,(m-1,m) .

[0147] The secondary winding can be equipped with several positive gears, several negative gears, and a zero gear, or it can be equipped with only several positive gears and a zero gear, and equipped with a polarity reversal switch. By adjusting the polarity reversal switch, the positive gear can be used as a negative gear, thus achieving reverse voltage compensation.

[0148] For example, the secondary winding can be installed with several positive gears, several negative gears and one zero gear at the same time. Assume that the secondary winding has a total of n - +n + +1 gear, including n + forward gears, n - There are negative gears and a zero gear, and the number of turns between adjacent gears is N c , N c When the negative gear is working, the negative gear switch is considered to be on, that is, u = 1; when the negative gear is not working, the negative gear switch is considered to be off, that is, u = 1.

[0149] It should also be noted that the phase-shifting transformer 1 can also be phase-adjusted. The principle of phase adjustment is as follows: taking any phase as an example, assuming that the primary winding is set to gear i and the secondary winding is set to gear j, the phase difference between the output voltage and the input voltage of the phase-shifting transformer 1 can be expressed as:

[0150]

[0151] The voltage amplitude adjustment range of the phase-shifting transformer 1 is Voltage phase adjustment range:

[0152] An example of combined adjustment of the primary and secondary windings of phase-shifting transformer 1 is as follows:

[0153] Assume that the primary winding of the multi-combination adjustable phase-shifting transformer 1 has 3 gears, and the highest gear of the secondary winding is gear 3, that is, the secondary winding has a total of 7 gears, including 3 positive gears, 3 negative gears, and one 0 gear.

[0154] Example 1: Assuming the primary winding is in a certain gear, the secondary winding is in gears 2 and -3. The voltage regulation diagram is as follows: Figure 6 and 7 As shown, the adjustment phases are and Figure 6 and 7 ΔU in LA It will decrease as the primary winding gear increases, and it will increase as the primary winding gear decreases.

[0155] Example 2: When the secondary winding is at gear 0, adjust the primary winding gear to compensate the voltage ΔU LA It will not change, the amplitude and phase are always 0.

[0156] Example 3: Assuming the secondary winding is in a forward gear and the primary winding is in gear 2, the voltage regulation diagram is as follows: Figure 8 As shown, the adjustment phase is Figure 8 ΔU in LA It will increase as the secondary winding gear increases, and will decrease as the secondary winding gear decreases.

[0157] Example 4: Assuming the secondary winding is in a negative gear, the voltage regulation diagram of the primary winding in gear 1 is as follows: Figure 9 As shown, the adjustment phase is Figure 9 ΔU in LA It will increase as the secondary winding gear increases, and will decrease as the secondary winding gear decreases.

[0158] It should be noted that the traditional adjustment method of the phase-shifting transformer 1 has many problems, such as poor adjustment flexibility, limited gear combinations, narrow application range, and poor adjustment accuracy. The advantages of the present invention over the traditional method are mainly reflected in the fact that both the primary winding and the secondary winding of the phase-shifting transformer 1 used in the present invention are adjustable. This can be intuitively demonstrated through the following example:

[0159] Taking phase A as an example, assuming that the line requires a compensation voltage ΔU LA ,Depend on Figure 4 Can get Voltage relationship, N LA 、N 23 are the effective turns of the secondary winding and the primary winding respectively. Assuming that the required turns relationship is

[0160] Traditional structure: the primary winding is not adjustable, assuming N 23 = 50 turns, meaning the effective number of turns connected to the primary winding is 50. Assume the secondary winding has five gears: 0, 1, 2, 3, and 4, with 10 turns between adjacent gears. Positioning the secondary winding in gear 0 indicates 0 turns connected, 1 indicates 1*10=10 turns connected, 2 indicates 2*10=20 turns connected, and so on. Based on the gears, the ratio of the effective number of turns connected to the primary winding can be 0, 1 / 5, 2 / 5, 3 / 5, and 4 / 5. It can be seen that the required 1 / 2 is not required, so the traditional structure has few gear combinations and low accuracy.

[0161] The present invention has an adjustable primary winding with five gears, namely 1, 2, 3, 4, and 5, with 10 turns between adjacent gears. The effective number of turns connected is 10, 20, 30, 40, and 50. The secondary winding is consistent with the above-mentioned traditional structure. The secondary winding has five gears, namely 0, 1, 2, 3, and 4, with 10 turns between adjacent gears. The effective number of turns connected is 0, 10, 20, 30, and 40. According to the gears, the ratio of the effective number of turns connected to the primary winding is 5*5=25 combinations as follows:

[0162]

[0163] As can be seen from the table, the required 1 / 2 turns ratio is available. Therefore, the present invention has more gear combinations, thereby having higher adjustment accuracy.

[0164] The table also shows that the presence of identical turns ratios demonstrates the present invention's enhanced regulation reliability and flexibility. For example, if a gear tap or tap adjustment switch fails, other similar or close-ratio combinations can be used to continue generating the same or similar compensation voltage. For example, if the 10 / 20 combination in the table above fails, the 20 / 40 combination can be used. If no identical turns ratio combinations exist, the 20 / 50 and 30 / 50 combinations, which offer lower tolerances, can be used.

[0165] Through the above examples, it can be seen that the present invention improves the adjustment flexibility and adjustment accuracy by setting gears with unequal numbers of turns in the primary winding and adjusting multiple combinations of the primary winding and the secondary winding, thereby solving the problems of poor adjustment flexibility, few gear combinations, narrow application range and poor adjustment accuracy in the prior art.

[0166] like Figure 2 As shown, based on the above method embodiment, a corresponding device embodiment is provided;

[0167] An embodiment of the present invention provides a gear adjustment device for a phase-shifting transformer 1, characterized in that the phase-shifting transformer 1 includes: an A-phase primary winding 11, a B-phase primary winding 12, a C-phase primary winding 13, an A-phase secondary winding 21, a B-phase secondary winding 22, a C-phase secondary winding 23, a plurality of first gear switches 31, and a plurality of second gear switches 32; wherein the second gear switches 32 are classified according to the adjustment direction, including: a positive gear switch, a negative gear switch, and a zero gear switch;

[0168] The A-phase primary winding 11, the B-phase primary winding 12, and the C-phase primary winding 13 are connected in a triangle; the angular lead wire between the A-phase primary winding 11 and the B-phase primary winding 12 is connected to the C-phase secondary winding 23 and the C-phase circuit; the angular lead wire between the B-phase primary winding 12 and the C-phase primary winding 13 is connected to the A-phase secondary winding 21 and the A-phase circuit; the angular lead wire between the A-phase primary winding 11 and the C-phase primary winding 13 is connected to the B-phase secondary winding 22 and the B-phase circuit; a plurality of first gear switches 31 are provided on the A-phase primary winding 11, the B-phase primary winding 12, and the C-phase primary winding 13; a plurality of positive gear switches, a plurality of negative gear switches, and a zero gear switch are provided on the A-phase secondary winding 21, the B-phase secondary winding 22, and the C-phase secondary winding 23;

[0169] The gear adjustment device of the phase-shifting transformer 1 includes: a data acquisition module and a gear adjustment module;

[0170] The data acquisition module is used to obtain the corresponding compensation voltage value and primary winding voltage value for each phase in the three-phase circuit;

[0171] The gear adjustment module is used to determine the target turns ratio and target adjustment direction of the primary winding and secondary winding of the corresponding phase of the phase-shifting transformer 1 based on the compensation voltage value and the primary winding voltage value; wherein the target adjustment direction includes: positive adjustment, negative adjustment and zero adjustment; according to the target turns ratio and the target adjustment direction, adjust the first gear switch 31 and the second gear switch 32 of the corresponding phase.

[0172] It can be understood that the above-mentioned device embodiment corresponds to the method embodiment of the present invention, and can implement the gear adjustment method of the phase-shifting transformer 1 provided by any one of the above-mentioned method embodiments of the present invention.

[0173] It should be noted that the device embodiments described above are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. Furthermore, in the drawings of the device embodiments provided by the present invention, the connection relationship between modules indicates that they have a communication connection, which may be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement the present invention without inventive effort.

[0174] Based on the above-mentioned embodiment of the gear adjustment method of the phase-shifting transformer 1, another embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the gear adjustment method of the phase-shifting transformer 1 of any embodiment of the present invention is implemented.

[0175] For example, in this embodiment, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to implement the present invention. The one or more module elements may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device.

[0176] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0177] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, connecting various parts of the entire terminal device using various interfaces and lines.

[0178] Based on the above-mentioned embodiment of the gear adjustment method for a phase-shifting transformer, another embodiment of the present invention provides a computer-readable storage medium, including a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the gear adjustment method for a phase-shifting transformer described in any one of the above-mentioned method embodiments of the present invention.

[0179] Wherein, the module / unit integrated in the device / terminal equipment, if implemented in the form of a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0180] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for adjusting the gear position of a phase-shifting transformer, characterized in that: The phase-shifting transformer includes: a phase A primary winding, a phase B primary winding, a phase C primary winding, a phase A secondary winding, a phase B secondary winding, a phase C secondary winding, a plurality of first-position switches, and a plurality of second-position switches; wherein the second-position switches are classified according to adjustment direction, including: a positive-position switch, a negative-position switch, and a zero-position switch; The A-phase primary winding, the B-phase primary winding, and the C-phase primary winding are connected in a triangle; the angular lead wire between the A-phase primary winding and the B-phase primary winding is connected to the C-phase secondary winding and the C-phase circuit; the angular lead wire between the B-phase primary winding and the C-phase primary winding is connected to the A-phase secondary winding and the A-phase circuit; the angular lead wire between the A-phase primary winding and the C-phase primary winding is connected to the B-phase secondary winding and the B-phase circuit; the A-phase primary winding, the B-phase primary winding, and the C-phase primary winding are each provided with a plurality of first-gear switches; the A-phase secondary winding, the B-phase secondary winding, and the C-phase secondary winding are each provided with a plurality of positive-gear switches, a plurality of negative-gear switches, and a zero-gear switch; The gear adjustment method of the phase-shifting transformer includes: For each phase in the three-phase circuit, obtain the corresponding compensation voltage value and primary winding voltage value; Determining a target turns ratio and a target adjustment direction of the primary winding and the secondary winding of the corresponding phase of the phase-shifting transformer according to the compensation voltage value and the primary winding voltage value; wherein the target adjustment direction includes: positive adjustment, negative adjustment, and zero adjustment; According to the target turns ratio and the target adjustment direction, the first gear switch and the second gear switch of the corresponding phase are adjusted.

2. The method for adjusting the gear position of a phase-shifting transformer according to claim 1, wherein: In the A-phase primary winding, the B-phase primary winding, and the C-phase primary winding, the numbers of turns between adjacent first-gear switches are different; In the A-phase secondary winding, the B-phase secondary winding, and the C-phase secondary winding, the numbers of turns between adjacent second-gear switches are equal; The calculation formula for the number of turns between adjacent first-gear switches is: Where i represents the gear value of the primary winding, and its value range is {1, 2, ..., m}; m represents the total number of gears of the primary winding; N 1,(i-1,i) Indicates the number of turns between i-1 and i in the primary winding; N s Indicates the effective turns of the primary winding in gear 1.

3. The method for adjusting the gear position of a phase-shifting transformer according to claim 1, wherein: Determining a target turns ratio and a target adjustment direction of the primary winding and the secondary winding of the corresponding phase of the phase-shifting transformer according to the compensation voltage value and the primary winding voltage value includes: Calculating the target turns ratio according to the absolute value of the compensation voltage value and the primary winding voltage value; Determine the relationship between the compensation voltage value and 0; if the compensation voltage value is greater than 0, determine that the target adjustment direction is positive adjustment; if the compensation voltage value is less than 0, determine that the target adjustment direction is negative adjustment; if the compensation voltage value is equal to 0, determine that the target adjustment direction is negative adjustment.

4. The method for adjusting the gear position of a phase-shifting transformer according to claim 3, wherein: The target turns ratio is calculated as follows: Where a0 represents the target turns ratio; U1 represents the primary winding voltage; and ΔU represents the compensation voltage.

5. The method for adjusting the gear position of a phase-shifting transformer according to claim 1, wherein: The adjusting the first gear switch and the second gear switch of the corresponding phase according to the target turns ratio and the target adjustment direction includes: Combining each first gear switch and each second gear switch to obtain a plurality of gear combinations; Get the turns ratio of each gear combination and the type of the second gear switch; determining, as the target gear combination, a gear combination in which the turns ratio is equal to the target turns ratio and the adjustment direction of the second gear switch conforms to the target adjustment direction; The first gear switch and the second gear switch in the target gear combination are turned on, and the remaining first gear switches and second gear switches are turned off.

6. The method for adjusting the gear position of a phase-shifting transformer according to claim 5, wherein: Obtaining the turns ratio of each gear combination includes: For each gear combination, obtaining the number of turns between adjacent first gear switches, the number of turns between adjacent second gear switches, the gear value of the first gear switch in the gear combination, and the gear value of the second gear switch in the gear combination; Calculating the effective number of turns of the primary winding corresponding to the gear combination according to the number of turns between adjacent first gear switches and the gear value of the first gear switch in the gear combination; Calculating the effective number of turns of the secondary winding corresponding to the gear combination according to the number of turns between adjacent second gear switches and the gear value of the second gear switch in the gear combination; The turns ratio of the gear combination is calculated according to the effective turns of the primary winding and the effective turns of the secondary winding.

7. The method for adjusting the gear position of a phase-shifting transformer according to claim 6, wherein: The calculation formula for the effective number of turns of the primary winding is: Where i represents the gear value of the primary winding, that is, the gear value of the first gear switch in the gear combination; N 1,i Indicates the effective number of turns of the primary winding in gear i; N s Indicates the effective number of turns of the primary winding in gear 1; N 1,(i-1,i) It represents the number of turns between gear i-1 and gear i in the primary winding; m represents the total number of gears in the primary winding; The calculation formula for the effective number of turns of the secondary winding is: N 2,j =(-1) u jN c ; Where, j represents the gear value of the secondary winding, that is, the gear value of the second gear switch in the gear combination, and the value range is {-n - ,-n - +1,…,0,…,n + -1,n + };n - Indicates the total number of forward gears; n + Indicates the total number of negative gears; N 2,j Indicates the effective number of turns of the secondary winding in gear j; N c Indicates the number of turns between adjacent second-gear switches; u indicates the conduction state of the negative gear switch, when j ≥ 0, u = 0, when j < 0, u = 1; The calculation formula of the turns ratio is: Where a i,j Indicates the turns ratio of the gear combination where the gear value of the first gear switch is i and the gear value of the second gear switch is j.

8. A gear adjustment device for a phase-shifting transformer, characterized in that: The phase-shifting transformer includes: a phase A primary winding, a phase B primary winding, a phase C primary winding, a phase A secondary winding, a phase B secondary winding, a phase C secondary winding, a plurality of first-position switches, and a plurality of second-position switches; wherein the second-position switches are classified according to adjustment direction, including: a positive-position switch, a negative-position switch, and a zero-position switch; The A-phase primary winding, the B-phase primary winding, and the C-phase primary winding are connected in a triangle; the angular lead wire between the A-phase primary winding and the B-phase primary winding is connected to the C-phase secondary winding and the C-phase circuit; the angular lead wire between the B-phase primary winding and the C-phase primary winding is connected to the A-phase secondary winding and the A-phase circuit; the angular lead wire between the A-phase primary winding and the C-phase primary winding is connected to the B-phase secondary winding and the B-phase circuit; the A-phase primary winding, the B-phase primary winding, and the C-phase primary winding are each provided with a plurality of first-gear switches; the A-phase secondary winding, the B-phase secondary winding, and the C-phase secondary winding are each provided with a plurality of positive-gear switches, a plurality of negative-gear switches, and a zero-gear switch; The gear adjustment device of the phase-shifting transformer includes: a data acquisition module and a gear adjustment module; The data acquisition module is used to obtain the corresponding compensation voltage value and primary winding voltage value for each phase in the three-phase circuit; The gear adjustment module is used to determine the target turns ratio and target adjustment direction of the primary winding and secondary winding of the corresponding phase of the phase-shifting transformer based on the compensation voltage value and the primary winding voltage value; wherein the target adjustment direction includes: positive adjustment, negative adjustment and zero adjustment; according to the target turns ratio and the target adjustment direction, adjust the first gear switch and the second gear switch of the corresponding phase.

9. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the gear adjustment method of the phase-shifting transformer according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that include: A stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the gear adjustment method of the phase-shifting transformer according to any one of claims 1 to 7.

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