Phase-shifting transformer with adjustable number of turns in coil, control method, medium and device

Abstract

The application provides a phase-shifting transformer with adjustable coil access turns, a control method, a medium and equipment. The phase-shifting transformer comprises a three-phase four-column core structure and an adjusting unit; each phase four-column core structure comprises a main column, a parallel excitation winding, a series adjustable winding and an on-load tap changer; the parallel excitation winding and the series adjustable winding both comprise a power supply side and a load side; the three phases form a closed loop through the cross connection of the parallel excitation winding and the series adjustable winding. The on-load tap changer is connected to different turn connection points of the series adjustable winding, and the adjusting unit is used for switching the tap. The control method determines a current phase-shifting angle according to current operating parameters, determines a target phase-shifting angle according to line parameters or a preset strategy, and adjusts the access turns of the series adjustable winding and / or changes the access polarity of the winding to adjust the polarity of the winding through the adjusting unit after calculating the deviation. The application realizes independent or collaborative control of the phase angle amplitude and the angle, and improves the flexibility of power system regulation.

Description

Technical Field

[0001] This invention belongs to the field of power system and power equipment control technology, specifically relating to a phase-shifting transformer with adjustable coil winding turns, control method, medium and equipment. Background Technology

[0002] With the large-scale grid connection of new energy sources and the increasing complexity of grid operation conditions, power flow distribution and active power transmission in transmission lines are exhibiting greater dynamism and uncertainty. To ensure the safe and stable operation of the system, the power grid has placed higher demands on the flexibility, response speed, and control accuracy of active power flow regulation devices.

[0003] Phase-shifting transformers, as important devices for adjusting the phase angle of transmission lines and thus controlling the direction and magnitude of active power flow, have been applied in power grid power flow control.

[0004] Existing phase-shifting transformers suffer from problems such as limited adjustment dimensions, insufficient structural adaptability, or limited adjustment accuracy. Some solutions can only roughly change the phase angle, making it difficult to achieve flexible control of both phase angle amplitude and phase angle. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, in a first aspect, this application proposes a phase-shifting transformer with adjustable coil winding turns, the phase-shifting transformer comprising a three-phase four-column core structure and an adjustment unit; Each phase of the four-column core structure includes: a main column, a parallel excitation winding, a series adjustable winding, and an on-load tap changer; the parallel excitation winding and the series adjustable winding are respectively wound on different axial local sections of the main column; the parallel excitation winding and the series adjustable winding each include a power supply side and a load side, each with two terminals. One terminal of the parallel excitation winding on the power supply side is connected to one terminal of the series adjustable winding of the other two phases on the power supply side; one terminal of the parallel excitation winding on the load side is connected to one terminal of the series adjustable winding of the other two phases on the load side. One terminal of the series adjustable winding on the power supply side is connected to one terminal of the parallel excitation winding on the power supply side of the other two phases; one terminal of the series adjustable winding on the load side is connected to one terminal of the parallel excitation winding on the load side of the other two phases. The on-load tap changer includes multiple taps, each of which is connected to different coil turn connection points of the series adjustable winding. The regulating unit is signal-connected to the on-load tap changer and is used to switch between different taps.

[0006] Preferably, the other terminal on the power supply side of the parallel excitation winding serves as the power supply input terminal of the phase-shifting transformer; The other terminal on the load side of the parallel excitation winding serves as the load-side output terminal of the phase-shifting transformer.

[0007] Preferably, the phase-shifting transformer further includes: a bypass column and a polarity-adjusting winding; The side column is located on the radial side of the main column in the four-column core structure of each phase; The polarity adjustment winding is wound in the axial section of the side column, and the winding direction of the polarity adjustment winding is opposite to the winding direction of the series adjustable winding in the four-column core structure of each phase.

[0008] Preferably, the on-load tap changer further includes a tap selector; the switching terminals of the tap selector are used to switch between different taps; The fixed contact terminals of the tap selector of the on-load tap changer in each phase of the four-column core structure are interconnected.

[0009] Preferably, the on-load tap changer further includes a polarity selector; the common terminals of the polarity selectors of the on-load tap changers in each phase of the four-column core structure are interconnected. The polarity selector includes a polarity switching terminal, a positive selection point, and a negative selection point; the positive selection point and the negative selection point are respectively connected to the two ends of the polarity adjustment winding; the polarity switching terminal is used to switch the positive selection point or the negative selection point.

[0010] Preferably, the turns ratio of the parallel excitation winding on the power supply side to the load side is 1:1.

[0011] Preferably, the on-load tap changer has 10 to 30 taps.

[0012] Preferably, the total number of turns of the series adjustable winding is designed according to the maximum phase shift angle set by the phase-shifting transformer.

[0013] Secondly, this invention application also proposes a control method for a phase-shifting transformer with adjustable coil turns, comprising: Based on the current operating parameters of the phase-shifting transformer, determine the current phase shift angle of the phase-shifting transformer; The target phase shift angle is determined based on the current line parameters of the line to which the phase-shifting transformer is connected; Calculate the phase shift angle deviation based on the current phase shift angle and the target phase shift angle; Based on the phase shift angle deviation, the adjustment unit of the phase shift transformer is used to adjust the number of turns of the connected coil of the series adjustable winding of the phase shift transformer step by step, or / and change the connection polarity of the polarity adjustment winding of the phase shift transformer, until the phase shift angle deviation between the current phase shift angle after adjustment and the target phase shift angle is less than the set threshold. The phase-shifting transformer is the phase-shifting transformer described above.

[0014] Preferably, the current operating parameters of the phase-shifting transformer include: the voltage amplitude on the power supply side and the voltage amplitude on the load side of the phase-shifting transformer; Determining the current phase shift angle of the phase shift transformer based on its current operating parameters includes: Based on the voltage amplitude on the power supply side and the voltage amplitude on the load side of the phase-shifting transformer, determine the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding; The current phase shift angle of the phase-shifting transformer is determined based on the amplitude of the series voltage component and the amplitude of the power supply side voltage. The amplitude of the series voltage component satisfies the following formula:

[0015] In the above formula, This represents the voltage amplitude on the load side. ΔU represents the voltage amplitude on the power supply side, and ΔU represents the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding.

[0016] Preferably, the phase shift angle deviation includes: the deviation in the magnitude of the phase shift angle; The method of adjusting the number of turns of the series adjustable winding of the phase-shifting transformer step by step, based on the phase shift angle deviation, using the adjustment unit of the phase-shifting transformer, includes: Based on the angle deviation and the tap step size of the on-load tap changer, determine the phase angle change corresponding to the tap step size; The number of turns of the input coil is determined based on the phase angle change corresponding to the tap step size and the angle deviation. Based on the aforementioned angle deviation, the adjustment unit of the phase-shifting transformer is used to control the on-load tap changer to switch the taps step by step, thereby realizing the step-by-step adjustment of the number of turns of the series adjustable winding of the phase-shifting transformer. The number of turns of the access coil satisfies the following formula:

[0017] In the above formula, The number of turns in the coil is the input, and Δφ is the angular deviation. This represents the change in phase angle corresponding to the tap step size.

[0018] Preferably, determining the phase angle change corresponding to the tap step size based on the angle deviation and the tap step size of the on-load tap changer includes: Based on the angle deviation and the tap step size of the on-load tap changer, determine the vector length corresponding to the number of turns of adjacent two-stage access coils; The phase angle change corresponding to the tap step size is determined based on the vector length corresponding to the number of turns of the adjacent two-stage access coils. The vector lengths corresponding to the number of turns of two adjacent access coils satisfy the following formula:

[0019] In the above formula, For the first n The vector length corresponding to the number of turns of the stage-connected coil. For the first n- The vector length corresponding to the number of turns of the first-level input coil, k is the proportional coefficient for step-by-step adjustment, and b is the constant offset for step-by-step adjustment.

[0020] Preferably, the step of adjusting the number of turns of the series adjustable winding of the phase-shifting transformer step by step using the adjustment unit of the phase-shifting transformer based on the phase-shifting angle deviation, and / or changing the polarity of the polarity adjustment winding of the phase-shifting transformer, until the phase-shifting angle deviation between the adjusted current phase-shifting angle and the target phase-shifting angle is less than a set threshold, further includes: Detect the operating status of the four-column core structure of each phase in the phase-shifting transformer; If a phase of the four-column core structure is in a short-circuit fault or overload fault, the adjustment unit is used to control the on-load tap changer of the four-column core structure to disconnect the series adjustable winding in the four-column core structure.

[0021] Thirdly, this application also proposes an electronic device, comprising: at least one processor and a memory; wherein the memory and the processor are connected via a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, the control method for a phase-shifting transformer with adjustable coil access turns is implemented.

[0022] Fourthly, this application also proposes a readable storage medium having an executable program stored thereon, which, when executed, implements the control method for a phase-shifting transformer with adjustable coil turns.

[0023] Fifthly, this application also proposes a control device for a phase-shifting transformer with adjustable coil turns, comprising: The determination module is used to determine the current phase shift angle of the phase shift transformer based on the current operating parameters of the phase shift transformer; The target phase shift angle determination module is used to determine the target phase shift angle based on the current line parameters of the line to which the phase shift transformer is connected; The calculation module is used to calculate the phase shift angle deviation based on the current phase shift angle and the target phase shift angle; The step-by-step adjustment module is used to adjust the number of turns of the series adjustable winding of the phase-shifting transformer step by step, or / and change the polarity of the polarity adjustment winding of the phase-shifting transformer, based on the phase shift angle deviation, using the adjustment unit of the phase-shifting transformer, until the phase shift angle deviation between the adjusted current phase shift angle and the target phase shift angle is less than a set threshold.

[0024] Preferably, the current operating parameters of the phase-shifting transformer include: the voltage amplitude on the power supply side and the voltage amplitude on the load side of the phase-shifting transformer; The determining module is specifically used for: Based on the voltage amplitude on the power supply side and the voltage amplitude on the load side of the phase-shifting transformer, determine the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding; The current phase shift angle of the phase-shifting transformer is determined based on the amplitude of the series voltage component and the amplitude of the power supply side voltage. The amplitude of the series voltage component satisfies the following formula:

[0025] In the above formula, This represents the voltage amplitude on the load side. ΔU represents the voltage amplitude on the power supply side, and ΔU represents the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding.

[0026] Preferably, the phase shift angle deviation includes: the deviation in the magnitude of the phase shift angle; The step-by-step adjustment module includes: The phase angle change determination submodule is used to determine the phase angle change corresponding to the tap step size based on the angle deviation and the tap step size of the on-load tap changer. The coil turns determination submodule is used to determine the number of coil turns to be connected based on the phase angle change corresponding to the tap step size and the angle deviation. The step-by-step adjustment submodule is used to adjust the number of turns of the series adjustable winding of the phase-shifting transformer step by step by controlling the on-load tap changer to switch the taps based on the angle deviation. The number of turns of the access coil satisfies the following formula:

[0027] In the above formula, The number of turns in the coil is the input, and Δφ is the angular deviation. This represents the change in phase angle corresponding to the tap step size.

[0028] Preferably, the phase angle change determination submodule is specifically used for: Based on the angle deviation and the tap step size of the on-load tap changer, determine the vector length corresponding to the number of turns of adjacent two-stage access coils; The phase angle change corresponding to the tap step size is determined based on the vector length corresponding to the number of turns of the adjacent two-stage access coils. The vector lengths corresponding to the number of turns of two adjacent access coils satisfy the following formula:

[0029] In the above formula, For the first n The vector length corresponding to the number of turns of the stage-connected coil. For the first n- The vector length corresponding to the number of turns of the first-level input coil, k is the proportional coefficient for step-by-step adjustment, and b is the constant offset for step-by-step adjustment.

[0030] Preferably, the control device further includes a control module for: Detect the operating status of the four-column core structure of each phase in the phase-shifting transformer; If a phase of the four-column core structure is in a short-circuit fault or overload fault, the adjustment unit is used to control the on-load tap changer of the four-column core structure to disconnect the series adjustable winding in the four-column core structure.

[0031] In a sixth aspect, this application also proposes a control system for a phase-shifting transformer with adjustable coil turns, comprising the phase-shifting transformer and the control device; the control system is used in a power system.

[0032] Compared with the closest prior art, the present invention application has the following beneficial effects: This invention discloses a phase-shifting transformer with adjustable coil turns and its control method. The phase-shifting transformer includes a three-phase four-limb core structure and an adjustment unit. Each phase of the four-limb core structure includes: a main column, a parallel excitation winding, a series adjustable winding, and an on-load tap changer. The parallel excitation winding and the series adjustable winding are respectively wound on different axial local sections of the main column. Both the parallel excitation winding and the series adjustable winding include a power supply side and a load side, each with two terminals. One terminal of the power supply side of the parallel excitation winding is connected to one terminal of the power supply side of the series adjustable winding of one of the other two phases. One terminal on the load side of the series-connected magnetizing winding is connected to one terminal on the load side of one of the series-connected adjustable windings of the other two phases; one terminal on the power supply side of the series-connected adjustable winding is connected to one terminal on the power supply side of the parallel-connected magnetizing winding of the other two phases; one terminal on the load side of the series-connected adjustable winding is connected to one terminal on the load side of the parallel-connected magnetizing winding of the other two phases; the on-load tap changer includes multiple taps, each tap being connected to a different number of turns connection point of the series-connected adjustable winding; the adjustment unit is signal-connected to the on-load tap changer for switching different taps. Adjusting the number of turns connected in the series-connected adjustable winding changes the phase angle amplitude and phase angle injected into the phase-shifting transformer. Therefore, the phase-shifting transformer can independently or collaboratively control the phase angle, overcoming the shortcomings of existing technologies that can only roughly adjust the phase angle and cannot simultaneously consider both amplitude and angle. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the phase-shifting transformer provided in this invention application; Figure 2 This is a detailed connection diagram of the parallel excitation windings and series adjustable windings in the three phases A, B, and C of the phase-shifting transformer provided in this invention application; Figure 3 A schematic diagram of a phase-shifting transformer with parallel excitation windings and series adjustable windings in phases A, B, and C provided in this invention application, including a load tap changer. Figure 4 A schematic diagram of the on-load tap changer of the phase-shifting transformer provided in this invention application; Figure 5 A flowchart of the control method for a phase-shifting transformer provided in this invention application; Figure 6 A schematic diagram of a gradient triangle for the control method of a phase-shifting transformer provided in this invention application; Figure 7 This is a schematic diagram of the phase-shifting transformer radial decoupling in the control method of the phase-shifting transformer provided in this application of the present invention; Figure 8Here is a flowchart illustrating a specific use case of the control method for a phase-shifting transformer provided in this invention application; Figure 9 This is a schematic diagram of the operation of an electronic device provided in this invention application. Detailed Implementation

[0034] The specific embodiments of this invention will be further described in detail below with reference to the accompanying drawings.

[0035] Example 1: like Figure 1 , 2 As shown in Figure 3, this invention application proposes a phase-shifting transformer with adjustable coil turns, the phase-shifting transformer including a three-phase four-column core structure and an adjustment unit; each phase includes three phases A, B, and C; Each phase of the four-column core structure includes: a main column, a parallel excitation winding, a series adjustable winding, and an on-load tap changer; the parallel excitation winding and the series adjustable winding are respectively wound on different axial local sections of the main column; the parallel excitation winding and the series adjustable winding each include a power supply side and a load side, each with two terminals. One terminal of the parallel excitation winding on the power supply side is connected to one terminal of the series adjustable winding of the other two phases on the power supply side; one terminal of the parallel excitation winding on the load side is connected to one terminal of the series adjustable winding of the other two phases on the load side. One terminal of the series adjustable winding on the power supply side is connected to one terminal of the parallel excitation winding on the power supply side of the other two phases; one terminal of the series adjustable winding on the load side is connected to one terminal of the parallel excitation winding on the load side of the other two phases. The on-load tap changer includes multiple taps, each of which is connected to different coil turn connection points of the series adjustable winding. The regulating unit is signal-connected to the on-load tap changer and is used to switch between different taps.

[0036] like Figure 2As shown, the specific connection method of the parallel excitation winding and series adjustable winding in phases A, B, and C of the phase-shifting transformer is as follows: one terminal of the power supply side of the parallel excitation winding of phase A is connected to one terminal of the power supply side of the series adjustable winding of phase B; one terminal of the load side of the parallel excitation winding of phase A is connected to one terminal of the load side of the series adjustable winding of phase B; one terminal of the power supply side of the series adjustable winding of phase A is connected to one terminal of the power supply side of the parallel excitation winding of phase C; one terminal of the load side of the series adjustable winding of phase A is connected to one terminal of the load side of the parallel excitation winding of phase C; one terminal of the power supply side of the parallel excitation winding of phase B is connected to one terminal of the power supply side of the series adjustable winding of phase C; one terminal of the load side of the parallel excitation winding of phase B is connected to one terminal of the load side of the series adjustable winding of phase C; the main columns are all iron cores, which can be cylindrical.

[0037] Furthermore, the other terminal on the power supply side of the parallel excitation winding serves as the power supply input terminal of the phase-shifting transformer; The other terminal on the load side of the parallel excitation winding serves as the load-side output terminal of the phase-shifting transformer.

[0038] like Figure 2 In this system, the three-phase parallel excitation windings are A1 / A2, B1 / B2, and C1 / C2, with their power supply side terminals being USA, USB, and USC, and their load side terminals being ULA, ULB, and ULC. The power supply side is used to connect to the three-phase power supply of the power system, and the load side is used to connect to the transmission line load. The parallel excitation windings then provide excitation flux, which is used by the three-phase transformer to maintain the basic voltage balance of the connected power system.

[0039] The three-phase series adjustable windings are A3 / A4, B3 / B4, and C3 / C4. The series adjustable windings are connected to each phase line in series. By adjusting the number of turns of the internal coil (i.e., the winding), the phase angle (magnitude, amplitude, and direction) can be precisely controlled.

[0040] Furthermore, the phase-shifting transformer also includes: a side column and a polarity adjustment winding; wherein the side column is an iron core, which can be cylindrical; The side column is located on the radial side of the main column in the four-column core structure of each phase; The polarity adjustment winding is wound in the axial section of the side column, and the winding direction of the polarity adjustment winding is opposite to the winding direction of the series adjustable winding in the four-column core structure of each phase.

[0041] Furthermore, the on-load tap changer also includes a tap selector; the switching terminals of the tap selector are used to switch between different taps. The fixed contact terminals of the tap selector of the on-load tap changer in each phase of the four-column core structure are interconnected.

[0042] Each of the aforementioned series-connected adjustable windings is equipped with one on-load tap changer. The on-load tap changer can switch the taps and perform continuous adjustment without interrupting the power supply to the line connected to the phase-shifting transformer.

[0043] Furthermore, such as Figure 4 As shown, the on-load tap changer also includes a polarity selector; the common terminals of the polarity selectors of the on-load tap changers in each phase of the four-column core structure are interconnected. The polarity selector includes a polarity switching terminal, a positive selection point, and a negative selection point; the positive selection point and the negative selection point are respectively connected to the two ends of the polarity adjustment winding; the polarity switching terminal is used to switch the positive selection point or the negative selection point.

[0044] Since the on-load tap changer includes a polarity selector, it has a polarity switching function: by changing the connection direction of the polarity regulating winding, the series voltage ΔU of the series adjustable winding can be varied between 0~+Umax and 0~-Umax, where Umax is the maximum adjustable value of the series adjustable winding voltage, and at the same time, it corresponds to phase angle lead / lag adjustment.

[0045] Furthermore, the turns ratio of the parallel excitation winding on the power supply side to the load side is 1:1. This ensures that the basic voltage levels of the power supply side and the load side are consistent; the rated voltage can be set at 220kV or 500kV.

[0046] Furthermore, the on-load tap changer has 10 to 30 tap levels. The winding is divided into several equal taps, and the number of taps determines the adjustment accuracy (usually 10 to 30 levels).

[0047] Furthermore, the total number of turns of the series adjustable winding is designed according to the maximum phase shift angle set by the phase-shifting transformer. When the maximum phase shift angle is ±30°, the maximum amplitude of the voltage injected by the series adjustable winding is approximately 57.7% of the phase voltage of the phase-shifting transformer. After adding transmission losses, the maximum amplitude of the voltage injected by the series adjustable winding is close to 50% of the voltage of the phase-shifting transformer.

[0048] Furthermore, by adjusting the series adjustable windings of the three phases A, B, and C, the amplitude and angle of the current phase shift angle can be changed simultaneously, or only the amplitude of the current phase shift angle can be changed, or only the angle of the current phase shift angle can be changed, thereby achieving phase decoupling.

[0049] In summary, the phase-shifting transformer with adjustable coil turns provided in this embodiment has the following beneficial effects: 1. The present invention adopts a three-phase four-column iron core structure, which provides better symmetry and independence for the three-phase magnetic circuit, effectively reduces inter-phase magnetic coupling interference, and improves the operational stability and regulation consistency of the phase-shifting transformer.

[0050] 2. Each phase of this invention adopts a combination structure of parallel excitation winding and series adjustable winding, which can maintain the basic voltage balance of the line connected to the phase-shifting transformer and realize independent control of the series injected voltage, with a clear division of functions.

[0051] 3. The present invention uses an on-load tap changer to adjust the number of turns of the input coil of the series adjustable winding step by step and switches the input polarity, which can realize continuous, bidirectional and fine adjustment of the output phase angle, with superior adjustment range and accuracy.

[0052] 4. This invention supports both simultaneous adjustment of phase amplitude and angle, as well as individual adjustment of both (i.e., amplitude decoupling), thus making it suitable for refined control requirements under different operational objectives.

[0053] 5. By combining and controlling the input quantities of each phase, the present invention can form multiple phase change modes, which is beneficial to improving the applicability and control flexibility of the phase-shifting transformer.

[0054] 6. The present invention enables the regulating unit to adjust the direction and magnitude of active power flow in transmission lines in real time according to the grid dispatching requirements, and is applicable to various scenarios such as power flow optimization, new energy grid integration and consumption, and system stability control.

[0055] 7. Under fault conditions, the present invention can reduce the equipment risk of the phase-shifting transformer by quickly disconnecting or short-circuiting the series adjustable winding, and has good engineering protection adaptability.

[0056] Example 2: like Figure 5 As shown, the present invention also provides a control method for a phase-shifting transformer with adjustable coil turns, which may include the following steps: Step 1: Determine the current phase shift angle of the phase shift transformer based on its current operating parameters; Step 2: Determine the target phase shift angle based on the current line parameters or preset control strategy of the line to which the phase shift transformer is connected; wherein, the preset control strategy may include at least one of the following: maintaining the active power of the line within a set range, maintaining the reactive power of the line within a set range, maintaining the bus voltage of the line to which the phase shift transformer is connected within a set range, changing the phase shift angle according to a preset timetable, or a phase shift angle preset according to the stability requirements of the line; Step 3: Calculate the phase shift angle deviation based on the current phase shift angle and the target phase shift angle; Step 4: Based on the phase shift angle deviation, the adjustment unit of the phase shift transformer is used to adjust the number of turns of the connected coil of the series adjustable winding of the phase shift transformer step by step, or / and change the connection polarity of the polarity adjustment winding of the phase shift transformer, until the phase shift angle deviation between the current phase shift angle after adjustment and the target phase shift angle is less than the set threshold. The phase-shifting transformer is the same as the phase-shifting transformer described in Example 1.

[0057] Furthermore, the current operating parameters of the phase-shifting transformer include: the voltage amplitude on the power supply side and the voltage amplitude on the load side of the phase-shifting transformer; Step 1 above, which involves determining the current phase shift angle of the phase-shifting transformer based on its current operating parameters, may include the following steps: Step 1.1: Determine the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding based on the voltage amplitude on the power supply side and the voltage amplitude on the load side of the phase-shifting transformer; Step 1.2: Determine the current phase shift angle of the phase-shifting transformer based on the amplitude of the series voltage component and the amplitude of the power supply side voltage; The amplitude of the series voltage component satisfies the following formula:

[0058] In the above formula, This represents the voltage amplitude on the load side. ΔU represents the voltage amplitude on the power supply side, and ΔU represents the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding.

[0059] The amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding satisfies the following formula:

[0060] In the above formula, It is the ratio of the voltage amplitude of the parallel excitation winding coil to the voltage amplitude of the series adjustable winding coil. For the equivalent reactance of the series winding, To induce voltage in the auxiliary coil, This represents the line current of the series winding.

[0061] By analyzing the amplitude of the series voltage component and the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding, the output phase angle and power regulation characteristics under different tap levels and different load current conditions can be analyzed.

[0062] In step 1.1 above, the current operating parameters of the phase-shifting transformer can be detected in real time. These parameters include the power supply voltage US, load side voltage UL, line current IL, and active power P. Since the three phases of the phase-shifting transformer are connected in series with adjustable windings, each phase voltage of these adjustable windings has a phase difference (ΔU), causing a shift in the overall voltage phase angle of the phase-shifting transformer. This alters the direction and magnitude of power transmission in the lines connected to the phase-shifting transformer. Therefore, the amplitude of the series voltage component injected into the phase-shifting transformer by the adjustable windings can be determined based on the power supply voltage amplitude and the load side voltage amplitude.

[0063] In step 4, the parallel excitation winding obtains excitation current from the connected line, generating main magnetic flux in the iron core of the parallel excitation winding, inducing the voltage of the corresponding phase series adjustable winding; by adjusting the number of turns connected to A3 / A4, B3 / B4, and C3 / C4 through the on-load tap changer, the magnitude of the series voltage component ΔU and the current phase shift angle can be changed; by switching the polarity to adjust the connection direction at both ends of the winding, the phase direction of the series voltage component ΔU can be changed (mainly to achieve leading / lagging the original voltage); after the magnitude of the three-phase series voltage component is superimposed with the original voltage of the line, a new load-side voltage UL is formed, whose phase angle is offset relative to the power supply-side voltage US, and the current phase shift angle is determined by the magnitude of the voltage component ΔU and the phase shift angle.

[0064] Furthermore, the phase shift angle deviation includes: the deviation in the magnitude of the phase shift angle; Step 4 above, which involves adjusting the number of turns of the series adjustable winding of the phase-shifting transformer step by step based on the phase-shifting angle deviation, may include the following steps: Step 4.1: Determine the phase angle change corresponding to the tap step size based on the angle deviation and the tap step size of the on-load tap changer; Step 4.2: Determine the number of turns of the input coil based on the phase angle change corresponding to the tap step size and the angle deviation; Step 4.3: Based on the angle deviation, the adjustment unit of the phase-shifting transformer is used to control the on-load tap changer to switch the taps step by step, thereby adjusting the number of turns of the connected coil of the series adjustable winding of the phase-shifting transformer step by step. The number of turns of the access coil satisfies the following formula:

[0065] In the above formula, The number of turns in the coil is the input, and Δφ is the angular deviation. This represents the change in phase angle corresponding to the tap step size.

[0066] Step 4.1 above, which involves determining the phase angle change corresponding to the tap step size based on the angle deviation and the tap step size of the on-load tap changer, may include the following steps: Step 4.1.1: Determine the vector length corresponding to the number of turns of adjacent two-stage access coils based on the angle deviation and the tap step size of the on-load tap changer; Step 4.1.2: Determine the phase angle change corresponding to the tap step size based on the vector length corresponding to the number of turns of the adjacent two-stage access coils; The vector lengths corresponding to the number of turns of two adjacent access coils satisfy the following formula:

[0067] In the above formula, For the first n The vector length corresponding to the number of turns of the stage-connected coil. For the first n- The vector length corresponding to the number of turns of the first-level input coil, k is the proportional coefficient for step-by-step adjustment, and b is the constant offset for step-by-step adjustment.

[0068] Further, step 4.1.2, which involves determining the phase angle change corresponding to the tap step size based on the vector length corresponding to the number of turns of the adjacent two-stage input coils, includes the following steps: Step a: Based on the vector length corresponding to the number of turns of the adjacent two-stage connected coils, the coil adjustment process of the series adjustable winding is equivalent to as follows: Figure 6 The diagram shows a gradually changing triangle (i.e., a phase angle control model). Step b: Determine the ratio of the parallel excitation winding coil voltage to the series adjustable winding coil voltage amplitude based on the amplitude of the series voltage component and the amplitude of the power supply side voltage; Step c: Based on the gradual triangle and the ratio of the voltage amplitude of the parallel excitation winding coil to the voltage amplitude of the series adjustable winding coil, construct a formula for calculating the phase angle change corresponding to the tap step size; Step d: Input the vector length corresponding to the number of turns of the adjacent two-stage access coil into the formula for calculating the phase angle change corresponding to the tap step length to obtain the phase angle change corresponding to the tap step length; The phase angle change corresponding to the tap step size satisfies the following formula:

[0069]

[0070] In the above formula, This represents the change in phase angle corresponding to the tap step size. The angle between the input voltage vector, determined by the gradient triangle, and the vertical reference line. It is the ratio of the voltage amplitude of the parallel excitation winding coil to the voltage amplitude of the series adjustable winding coil.

[0071] exist Figure 6 In the middle, ∠ It is a fixed included angle, and ∠ +∠ =60°, ∠ =∠ +∠ For example, ∠ =∠ +∠ ,∠ =∠ +∠ ,in Therefore, the step-by-step adjustment in step 4.3 satisfies the following formula:

[0072] In the above formula, For the first The length of the coil turns adjustment ( Figure 6 The dotted lines in the text actually correspond to the series adjustable winding adjustment. (length corresponding to the number of coil turns), such as , ; It is a gradient triangle. It is a positive integer. For the first The length of the coil turns is adjusted. For the first -1 gradient triangle coil to adjust the direction angle.

[0073] In step 4 above, based on the phase shift angle deviation, the adjustment unit of the phase shift transformer is used to adjust the number of turns of the series adjustable winding of the phase shift transformer step by step, and / or change the polarity of the polarity adjustment winding of the phase shift transformer, until the phase shift angle deviation between the adjusted current phase shift angle and the target phase shift angle is less than a set threshold. This includes the following adjustment methods: Adjustment Method 1: Using the tap selector of the on-load tap changer of each phase of the phase-shifting transformer, and the adjustment unit of the phase-shifting transformer, the switching terminals of the tap selector are controlled step by step to switch the taps, so that the number of turns of the series adjustable winding of each phase connected to the phase-shifting transformer changes linearly, thereby adjusting the phase angle amplitude and phase angle of the series adjustable winding of each phase injected into the phase-shifting transformer.

[0074] Adjustment Method 2: Using the polarity selector of the on-load tap changer for each phase and the adjustment unit of the phase-shifting transformer, the polarity switching terminal of the polarity selector is controlled to change the currently connected positive or negative selection point of the polarity selector. This causes the polarity selector of the on-load tap changer of each phase to change the polarity of the series adjustable winding connected to the phase-shifting transformer, thereby reversing the phase angle amplitude and phase angle of the series adjustable winding injected into the phase-shifting transformer for each phase.

[0075] To illustrate the specific adjustment method, the following example is provided: Initial state: All series adjustable windings are short-circuited, ΔU=0, the load side voltage and the power supply side voltage are in phase, and there is no power offset; Positive phase angle adjustment (lead): By connecting the number of positive coil turns of the series adjustable winding through the on-load tap changer, the amplitude of the series voltage component ΔU leads the power supply voltage by 90°. After superposition, the phase angle of the load-side voltage leads the voltage of the power supply side, increasing the active power transmitted by the line; Negative phase angle adjustment (hysteresis): By connecting the reverse coil turns of the series adjustable winding through the on-load tap changer, the amplitude of the series voltage component ΔU lags the power supply voltage by 90°. After superposition, the phase angle of the load-side voltage lags behind that of the power supply-side voltage, reducing or reversing the transmission of active power by the line; Precision control: The phase angle step size can be adjusted by gradually increasing or decreasing the number of turns of the series adjustable winding by the on-load tap changer, so as to meet the power regulation requirements under different operating conditions.

[0076] In step 4, based on the phase shift angle deviation, the adjustment unit of the phase shift transformer is used to adjust the number of turns of the series adjustable winding of the phase shift transformer step by step, and / or change the polarity of the polarity adjustment winding of the phase shift transformer, until the phase shift angle deviation between the adjusted current phase shift angle and the target phase shift angle is less than a set threshold. The following operating state is also included: Operating status 1: Detect the operating status of the four-column core structure of each phase in the phase-shifting transformer; If a phase of the four-column core structure is in a short-circuit fault or overload fault, the adjustment unit is used to control the on-load tap changer of the four-column core structure to disconnect the series adjustable winding in the four-column core structure.

[0077] Operating State 2: When a single-phase ground fault occurs on the line connected to the phase-shifting transformer, the fault phase current rises rapidly. Within milliseconds, the regulating unit detects that the current exceeds the threshold and immediately controls all series-connected adjustable windings of that phase to be short-circuited or disconnected to reduce the additional injected voltage under fault conditions and suppress stress on the equipment. After the fault is cleared, the regulating unit recalculates the target phase shift angle based on the restored system operating conditions and gradually restores the original regulating state. Furthermore, the regulating unit recalculates the target phase shift angle based on the restored line operating conditions and gradually restores the original regulating state.

[0078] Furthermore, such as Figure 7 As shown, the method further includes: adjusting the series adjustable windings connected to phases A, B, and C to simultaneously change the amplitude and angle of the current phase shift angle, or only changing the amplitude of the current phase shift angle, or only changing the angle of the current phase shift angle, thereby achieving phase angle decoupling. Figure 7 middle Indicates positive amplitude. The numbers ①, ②, ③, and ④ indicate that the amplitude levels increase sequentially.

[0079] In another embodiment, a correspondence table between the number of turns connected to the three-phase windings and the output phase angle parameters can be pre-established based on the target phase angle output requirements. During operation, the adjustment unit obtains the target adjustment amount of the three-phase windings A, B, and C by querying the correspondence table, and performs phase shift control accordingly, thereby reducing the amount of real-time calculation and improving the response speed.

[0080] In summary, the further innovation of this invention lies in the fact that the series adjustable windings connected to the three phases A, B, and C can be adjusted independently, which can realize the simultaneous change of the output phase angle amplitude and angle, or only the change of the output phase angle amplitude, or only the change of the output phase angle angle, thereby realizing the decoupling control of the phase angle amplitude and meeting the fine adjustment requirements under different operating conditions.

[0081] To illustrate the control method of a phase-shifting transformer with adjustable coil turns according to the present invention, a specific example is given below: like Figure 8 As shown, the specific steps include: collecting voltage and current parameters; generating a target phase shift angle according to a strategy; measuring the current phase shift angle and calculating the phase shift angle deviation; determining the forward and reverse connection based on the deviation phase shift angle and determining the number of tap stages; controlling the on-load tap changer to switch step by step so that the series adjustable winding is connected to the corresponding number of turns; determining whether the phase shift angle deviation meets the threshold requirement; if it does, the adjustment is complete.

[0082] The phase-shifting transformer of this invention is configured in a 220kV transmission line. The maximum design injection voltage of the series adjustable winding is 50% of the phase voltage of the phase-shifting transformer, corresponding to a maximum phase shift capability of ±30°. The on-load tap changer has 20 stages, each corresponding to a phase angle adjustment step of 1.5°. When the power system dispatch requires an increase in line transmission power, the regulating unit calculates the target phase shift angle as +15°, and accordingly determines to increase the number of forward winding turns of the series adjustable winding by 10 stages. After the switching is completed, the load-side voltage phase angle leads the power supply side by approximately 15°, and the line active power increases by approximately 12%.

[0083] It should be noted that existing phase-shifting transformers typically adjust the output voltage phase angle by changing the number of winding turns through mechanical on-load tap changer. However, this type of solution generally suffers from the following problems: first, the adjustment accuracy is limited, making it difficult to adapt to the requirements of refined power flow control; second, the response speed is slow, making it difficult to meet the dynamic adjustment requirements of modern power grids.

[0084] To address the above problems, the present invention provides a phase-shifting transformer with adjustable coil turns and its control method, which has the following beneficial effects: 1. High adjustment accuracy: By setting the number of taps of the on-load tap changer to 10 to 30, and combining the phase angle step size corresponding to each stage (such as 1.5° per stage), the phase shift angle can be finely adjusted step by step, meeting the accuracy requirements of modern power grid for power flow control.

[0085] 2. Fast response speed: The on-load tap changer is connected to the regulating unit signal, and the switching of the tap is automatically controlled according to the phase angle deviation. Compared with the traditional mechanical on-load tap changer, the regulation response speed is significantly improved, which meets the requirements of dynamic regulation of the power grid.

[0086] 3. Flexible adjustment method: The on-load tap changer can be controlled by the adjustment unit to adjust the number of turns of the connected coil of the series adjustable winding step by step, and / or the polarity of the connected polarity adjustment winding can be changed by the polarity selector, so as to realize the dual adjustment of phase shift angle amplitude and direction.

[0087] 4. This invention is based on voltage vector relationship and combined with recursive proportional relationship to determine tap step strategy, so that phase angle control has a clear mathematical basis, which facilitates the adjustment unit to realize quantitative calculation and closed-loop adjustment.

[0088] 5. Fault disconnection capability: When a short-circuit fault or overload fault is detected in the phase-shifting transformer, the regulating unit controls the on-load tap changer to short-circuit or disconnect the series adjustable winding corresponding to the fault, effectively suppressing the stress on the equipment and improving the operational safety of the power system.

[0089] 6. Under fault conditions, the parallel excitation winding, due to its structural characteristics, helps to suppress the rapid deterioration of the fault current; at the same time, the non-faulty phases can maintain or restore normal regulation state according to operating conditions, thereby improving the fault ride-through capability and power supply reliability of the power system.

[0090] Example 3: The present invention also provides a control device for a phase-shifting transformer with adjustable coil winding turns, comprising: The determination module is used to determine the current phase shift angle of the phase shift transformer based on the current operating parameters of the phase shift transformer; The target phase shift angle determination module is used to determine the target phase shift angle based on the current line parameters of the line to which the phase shift transformer is connected; The calculation module is used to calculate the phase shift angle deviation based on the current phase shift angle and the target phase shift angle; The step-by-step adjustment module is used to adjust the number of turns of the series adjustable winding of the phase-shifting transformer step by step, or / and change the polarity of the polarity adjustment winding of the phase-shifting transformer, based on the phase shift angle deviation, using the adjustment unit of the phase-shifting transformer, until the phase shift angle deviation between the adjusted current phase shift angle and the target phase shift angle is less than a set threshold.

[0091] Furthermore, the current operating parameters of the phase-shifting transformer include: the voltage amplitude on the power supply side and the voltage amplitude on the load side of the phase-shifting transformer; The determining module is specifically used for: Based on the voltage amplitude on the power supply side and the voltage amplitude on the load side of the phase-shifting transformer, determine the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding; The current phase shift angle of the phase-shifting transformer is determined based on the amplitude of the series voltage component and the amplitude of the power supply side voltage. The amplitude of the series voltage component satisfies the following formula:

[0092] In the above formula, This represents the voltage amplitude on the load side. ΔU represents the voltage amplitude on the power supply side, and ΔU represents the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding.

[0093] Furthermore, the phase shift angle deviation includes: the deviation in the magnitude of the phase shift angle; The step-by-step adjustment module includes: The phase angle change determination submodule is used to determine the phase angle change corresponding to the tap step size based on the angle deviation and the tap step size of the on-load tap changer. The coil turns determination submodule is used to determine the number of coil turns to be connected based on the phase angle change corresponding to the tap step size and the angle deviation. The step-by-step adjustment submodule is used to adjust the number of turns of the series adjustable winding of the phase-shifting transformer step by step by controlling the on-load tap changer to switch the taps based on the angle deviation. The number of turns of the access coil satisfies the following formula:

[0094] In the above formula, The number of turns in the coil is the input, and Δφ is the angular deviation. This represents the change in phase angle corresponding to the tap step size.

[0095] Furthermore, the phase angle change determination submodule is specifically used for: Based on the angle deviation and the tap step size of the on-load tap changer, determine the vector length corresponding to the number of turns of adjacent two-stage access coils; The phase angle change corresponding to the tap step size is determined based on the vector length corresponding to the number of turns of the adjacent two-stage access coils. The vector lengths corresponding to the number of turns of two adjacent access coils satisfy the following formula:

[0096] In the above formula, For the first n The vector length corresponding to the number of turns of the stage-connected coil. For the first n- The vector length corresponding to the number of turns of the first-level input coil, k is the proportional coefficient for step-by-step adjustment, and b is the constant offset for step-by-step adjustment.

[0097] Furthermore, the control device further includes a control module for: Detect the operating status of the four-column core structure of each phase in the phase-shifting transformer; If a phase of the four-column core structure is in a short-circuit fault or overload fault, the adjustment unit is used to control the on-load tap changer of the four-column core structure to disconnect the series adjustable winding in the four-column core structure.

[0098] Example 4: The present invention also provides a control system for a phase-shifting transformer with adjustable coil turns, including the phase-shifting transformer and the control device; the control system is arranged in a power system to regulate the stability of power transmission.

[0099] Example 5: like Figure 9 As shown, the present invention also provides an electronic device, which may be a computer device, a microcontroller device, a smart mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, processor, and transceiver component are connected via a bus; the memory can be used to store executable programs, and an exemplary executable program may include instructions; the processor is used to execute the instructions stored in the memory. The memory can also be used to store data, which can be accessed and / or modified when instructions are executed.

[0100] The processor may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, and it is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the storage medium to realize the corresponding method flow or corresponding function, so as to realize the steps of the control method of a phase-shifting transformer with adjustable coil access turns in the above embodiment.

[0101] Example 6: Based on the same inventive concept, this invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory). This readable storage medium is a memory device within an electronic device used to store programs and data. It is understood that the storage medium here can include both built-in storage media within the electronic device and extended storage media supported by the electronic device. The storage medium provides storage space, which stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more executable programs (including program code). It should be noted that the storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. Loading and executing one or more instructions stored in the storage medium by the processor can implement the steps of the control method for a phase-shifting transformer with adjustable coil turns in the above embodiments.

[0102] Those skilled in the art will understand that embodiments of this invention can be provided as methods, systems, or computer program products. Therefore, this invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0103] This invention application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0104] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0105] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims pending approval.

Claims

1. A phase-shifting transformer with adjustable coil turns, characterized in that, The phase-shifting transformer includes a three-phase four-column core structure and a regulating unit; Each phase of the four-column core structure includes: a main column, a parallel excitation winding, a series adjustable winding, and an on-load tap changer; the parallel excitation winding and the series adjustable winding are respectively wound on different axial local sections of the main column; the parallel excitation winding and the series adjustable winding each include a power supply side and a load side, each with two terminals. One terminal of the parallel excitation winding on the power supply side is connected to one terminal of the series adjustable winding of the other two phases on the power supply side; one terminal of the parallel excitation winding on the load side is connected to one terminal of the series adjustable winding of the other two phases on the load side. One terminal of the series adjustable winding on the power supply side is connected to one terminal of the parallel excitation winding on the power supply side of the other two phases; one terminal of the series adjustable winding on the load side is connected to one terminal of the parallel excitation winding on the load side of the other two phases. The on-load tap changer includes multiple taps, each of which is connected to different coil turn connection points of the series adjustable winding. The regulating unit is signal-connected to the on-load tap changer and is used to switch between different taps.

2. The phase-shifting transformer according to claim 1, characterized in that, The other terminal on the power supply side of the parallel excitation winding serves as the power supply input terminal of the phase-shifting transformer. The other terminal on the load side of the parallel excitation winding serves as the load-side output terminal of the phase-shifting transformer.

3. The phase-shifting transformer according to claim 1, characterized in that, The phase-shifting transformer also includes: a bypass column and a polarity-adjusting winding; The side column is located on the radial side of the main column in the four-column core structure of each phase; The polarity adjustment winding is wound in the axial section of the side column, and the winding direction of the polarity adjustment winding is opposite to the winding direction of the series adjustable winding in the four-column core structure of each phase.

4. The phase-shifting transformer according to claim 3, characterized in that, The on-load tap changer further includes a tap selector; the switching terminals of the tap selector are used to switch between different taps. The fixed contact terminals of the tap selector of the on-load tap changer in each phase of the four-column core structure are interconnected.

5. The phase-shifting transformer according to claim 4, characterized in that, The on-load tap changer also includes a polarity selector; the common terminals of the polarity selectors of the on-load tap changers in each phase of the four-column core structure are interconnected. The polarity selector includes a polarity switching terminal, a positive selection point, and a negative selection point; the positive selection point and the negative selection point are respectively connected to the two ends of the polarity adjustment winding; the polarity switching terminal is used to switch the positive selection point or the negative selection point.

6. The phase-shifting transformer according to claim 4, characterized in that, The ratio of the number of turns on the power supply side to the number of turns on the load side of the parallel excitation winding is 1:

1.

7. The phase-shifting transformer according to claim 1, characterized in that, The on-load tap changer has 10 to 30 tap levels.

8. The phase-shifting transformer according to claim 1, characterized in that, The total number of turns of the series adjustable winding is designed according to the maximum phase shift angle set by the phase-shifting transformer.

9. A control method for a phase-shifting transformer with adjustable coil turns, characterized in that, include: Based on the current operating parameters of the phase-shifting transformer, determine the current phase shift angle of the phase-shifting transformer; The target phase shift angle is determined based on the current line parameters of the line to which the phase-shifting transformer is connected; Calculate the phase shift angle deviation based on the current phase shift angle and the target phase shift angle; Based on the phase shift angle deviation, the adjustment unit of the phase shift transformer is used to adjust the number of turns of the connected coil of the series adjustable winding of the phase shift transformer step by step, or / and change the connection polarity of the polarity adjustment winding of the phase shift transformer, until the phase shift angle deviation between the current phase shift angle after adjustment and the target phase shift angle is less than the set threshold. The phase-shifting transformer is the phase-shifting transformer described in any one of claims 1-8.

10. The method according to claim 9, characterized in that, The current operating parameters of the phase-shifting transformer include: the voltage amplitude on the power supply side and the voltage amplitude on the load side of the phase-shifting transformer; Determining the current phase shift angle of the phase shift transformer based on its current operating parameters includes: Based on the voltage amplitude on the power supply side and the voltage amplitude on the load side of the phase-shifting transformer, determine the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding; The current phase shift angle of the phase-shifting transformer is determined based on the amplitude of the series voltage component and the amplitude of the power supply side voltage. The amplitude of the series voltage component satisfies the following formula: In the above formula, This represents the voltage amplitude on the load side. ΔU represents the voltage amplitude on the power supply side, and ΔU represents the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding.

11. The method according to claim 9, characterized in that, The phase shift angle deviation includes: the deviation in the magnitude of the phase shift angle; The method of adjusting the number of turns of the series adjustable winding of the phase-shifting transformer step by step, based on the phase shift angle deviation, using the adjustment unit of the phase-shifting transformer, includes: Based on the angle deviation and the tap step size of the on-load tap changer, determine the phase angle change corresponding to the tap step size; The number of turns of the input coil is determined based on the phase angle change corresponding to the tap step size and the angle deviation. Based on the aforementioned angle deviation, the adjustment unit of the phase-shifting transformer is used to control the on-load tap changer to switch the taps step by step, thereby realizing the step-by-step adjustment of the number of turns of the series adjustable winding of the phase-shifting transformer. The number of turns of the access coil satisfies the following formula: In the above formula, The number of turns in the coil is the input, and Δφ is the angular deviation. This represents the change in phase angle corresponding to the tap step size.

12. The method according to claim 11, characterized in that, The step of determining the phase angle change corresponding to the tap step size based on the angle deviation and the tap step size of the on-load tap changer includes: Based on the angle deviation and the tap step size of the on-load tap changer, determine the vector length corresponding to the number of turns of adjacent two-stage access coils; The phase angle change corresponding to the tap step size is determined based on the vector length corresponding to the number of turns of the adjacent two-stage access coils. The vector lengths corresponding to the number of turns of two adjacent access coils satisfy the following formula: In the above formula, For the first n The vector length corresponding to the number of turns of the stage-connected coil. For the first n- The vector length corresponding to the number of turns of the first-level input coil, k is the proportional coefficient for step-by-step adjustment, and b is the constant offset for step-by-step adjustment.

13. The method according to any one of claims 9-12, characterized in that, Based on the phase shift angle deviation, the adjustment unit of the phase shift transformer is used to adjust the number of turns of the series adjustable winding of the phase shift transformer step by step, and / or change the polarity of the polarity adjustment winding of the phase shift transformer, until the phase shift angle deviation between the adjusted current phase shift angle and the target phase shift angle is less than a set threshold, further comprising: Detect the operating status of the four-column core structure of each phase in the phase-shifting transformer; If a phase of the four-column core structure is in a short-circuit fault or overload fault, the adjustment unit is used to control the on-load tap changer of the four-column core structure to disconnect the series adjustable winding in the four-column core structure.

14. An electronic device, characterized in that, include: At least one processor and memory; The memory and processor are connected via a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, a control method for a phase-shifting transformer with adjustable coil access turns as described in any one of claims 9 to 13 is implemented.

15. A readable storage medium, characterized in that, It contains an execution program, which, when executed, implements a control method for a phase-shifting transformer with adjustable coil access turns as described in any one of claims 9 to 13.

16. A control device for a phase-shifting transformer with adjustable coil turns, characterized in that, Bag include: The determination module is used to determine the current phase shift angle of the phase shift transformer based on the current operating parameters of the phase shift transformer; The target phase shift angle determination module is used to determine the target phase shift angle based on the current line parameters of the line to which the phase shift transformer is connected; The calculation module is used to calculate the phase shift angle deviation based on the current phase shift angle and the target phase shift angle; The step-by-step adjustment module is used to adjust the number of turns of the series adjustable winding of the phase-shifting transformer step by step, or / and change the polarity of the polarity adjustment winding of the phase-shifting transformer, based on the phase shift angle deviation, using the adjustment unit of the phase-shifting transformer, until the phase shift angle deviation between the current phase shift angle after adjustment and the target phase shift angle is less than a set threshold. The phase-shifting transformer is the phase-shifting transformer described in any one of claims 1-8.

17. The control device according to claim 16, characterized in that, The current operating parameters of the phase-shifting transformer include: the voltage amplitude on the power supply side and the voltage amplitude on the load side of the phase-shifting transformer; The determining module is specifically used for: Based on the voltage amplitude on the power supply side and the voltage amplitude on the load side of the phase-shifting transformer, determine the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding; The current phase shift angle of the phase-shifting transformer is determined based on the amplitude of the series voltage component and the amplitude of the power supply side voltage. The amplitude of the series voltage component satisfies the following formula: In the above formula, This represents the voltage amplitude on the load side. ΔU represents the voltage amplitude on the power supply side, and ΔU represents the amplitude of the series voltage component injected into the phase-shifting transformer by the series adjustable winding.

18. The control device according to claim 16, characterized in that, The phase shift angle deviation includes: the deviation in the magnitude of the phase shift angle; The step-by-step adjustment module includes: The phase angle change determination submodule is used to determine the phase angle change corresponding to the tap step size based on the angle deviation and the tap step size of the on-load tap changer. The coil turns determination submodule is used to determine the number of coil turns to be connected based on the phase angle change corresponding to the tap step size and the angle deviation. The step-by-step adjustment submodule is used to adjust the number of turns of the series adjustable winding of the phase-shifting transformer step by step by controlling the on-load tap changer to switch the taps based on the angle deviation. The number of turns of the access coil satisfies the following formula: In the above formula, The number of turns in the coil is the input, and Δφ is the angular deviation. This represents the change in phase angle corresponding to the tap step size.

19. The control device according to claim 18, characterized in that, The phase angle change determination submodule is specifically used for: Based on the angle deviation and the tap step size of the on-load tap changer, determine the vector length corresponding to the number of turns of adjacent two-stage access coils; The phase angle change corresponding to the tap step size is determined based on the vector length corresponding to the number of turns of the adjacent two-stage access coils. The vector lengths corresponding to the number of turns of two adjacent access coils satisfy the following formula: In the above formula, For the first n The vector length corresponding to the number of turns of the stage-connected coil. For the first n- The vector length corresponding to the number of turns of the first-level input coil, k is the proportional coefficient for step-by-step adjustment, and b is the constant offset for step-by-step adjustment.

20. The control device according to any one of claims 16-19, characterized in that, The control device further includes a control module for: Detect the operating status of the four-column core structure of each phase in the phase-shifting transformer; If a phase of the four-column core structure is in a short-circuit fault or overload fault, the adjustment unit is used to control the on-load tap changer of the four-column core structure to disconnect the series adjustable winding in the four-column core structure.

21. A control system for a phase-shifting transformer with adjustable coil turns, characterized in that, It includes the phase-shifting transformer as described in any one of claims 1-8 and the control device as described in any one of claims 16-20.

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