Phase-shifting transformer voltage transformation control method and device, equipment and medium

Abstract

The application discloses a voltage transformation control method, device and equipment applied to a phase-shifting transformer and a medium, and belongs to the field of voltage transformation control applied to a phase-shifting transformer. The method is as follows: obtaining original voltage and current for any phase transformer; dividing the original current into first and second branch currents through a preset excitation point; obtaining an amplitude modulation current according to the second branch current, an excitation transformer primary winding and an excitation transformer autotransformer winding, and obtaining a phase-shifting current fed back by each phase transformer except the phase transformer; obtaining a left half winding voltage through a series transformer secondary side left half winding inductance according to the amplitude modulation current and a series transformer primary winding, and obtaining a right half winding voltage through a series transformer secondary side right half winding inductance; obtaining a single target voltage according to a series transformer secondary side winding impedance, the first branch current, the left half winding voltage, the original current, the original voltage, the phase-shifting current and the right half winding voltage, and then obtaining a total target voltage, so that the stability of voltage transformation of the phase-shifting transformer is improved.

Description

Technical Field

[0001] This invention relates to the field of transformer control for phase-shifting transformers, and more particularly to transformer control methods, devices, equipment, and media for phase-shifting transformers. Background Technology

[0002] With the continuous advancement of new power system construction, the power grid structure and parameter settings are becoming increasingly complex, and the proportion of new energy sources is constantly increasing, effectively reducing social carbon emissions and promoting sustainable human development. However, the natural distribution of power flow is increasingly unable to support the needs of new power systems, necessitating economical and effective power flow control equipment. Currently, the mainstream power flow control equipment is the phase shifting transformer (PST), which has advantages such as large power flow regulation capacity, good economy, and high reliability, and is widely used globally.

[0003] Currently, the main types of phase-shifting transformers (PSTs) can be divided into asymmetrical PSTs, symmetrical PSTs, and "Sen" type PSTs. Asymmetrical and symmetrical PSTs are one-dimensional phase-shifting transformers, each with only one degree of freedom in adjustment. They can typically only adjust the voltage phase, not the amplitude, thus failing to fully respond to system demands. The adjustment range of a "Sen" type PST is hexagonal, allowing for two-dimensional power flow regulation. However, the amplitude and phase shifting requirements of the system are asymmetrical. Ideally, the adjustment range should resemble a narrow fan-shaped ring centered at the origin, with adjustment points distributed both along the inner diameter and the circumference. This decouples and flexibly adjusts amplitude and phase, a feature completely absent in the hexagonal range of the ST. Due to this mismatch, a large area of ​​the ST's compensation voltage range becomes unusable, forcing the abandonment of adjustment points. Furthermore, the hexagonal distribution of ST adjustment points causes phase and amplitude to couple during adjustment, easily leading to deviations from the target and threatening system safety and stability. Moreover, the complex structure and numerous windings of the ST make it impractical for engineering applications. Summary of the Invention

[0004] This invention provides a method, apparatus, equipment, and medium for voltage control of phase-shifting transformers, which can solve the above-mentioned problems in the prior art and improve the voltage stability of phase-shifting transformers.

[0005] This invention provides a transformer control method for a phase-shifting transformer, wherein the phase-shifting transformer includes a three-phase transformer, and for any single phase transformer, it includes a series transformer and an excitation transformer. The series transformer includes a primary winding, a left half winding, and a right half winding. The excitation transformer includes a primary winding, a secondary winding, and an autotransformer winding. The method includes: For any one phase of a phase-shifting transformer: Obtain the original voltage and original current of the transformer in this phase; The original current is divided into a first branch current and a second branch current by a preset excitation point on the left half winding of the secondary side of the series transformer. The amplitude modulation current is obtained based on the second branch current, the primary winding of the excitation transformer, and the autotransformer winding of the excitation transformer, and the phase shift current fed back by the secondary winding of the excitation transformer of each transformer except the transformer of that phase is obtained respectively. Based on the amplitude modulation current and the primary winding of the series transformer, the voltage of the left half winding is induced through the left half winding of the secondary winding of the series transformer, and the voltage of the right half winding is induced through the right half winding of the secondary winding of the series transformer. The single target voltage is obtained based on the pre-acquired impedance of the secondary winding of the series transformer, the current of the first branch, the voltage of the left half winding, the original current, the original voltage, the phase-shifting current, and the voltage of the right half winding. Based on the single target voltage output by all phases of the phase-shifting transformer, the total target voltage output by the phase-shifting transformer is obtained.

[0006] In the above scheme, the original current is divided into a first branch current and a second branch current at a preset excitation point. An amplitude-modulated current is obtained based on the second branch current, the primary winding of the excitation transformer, and the autotransformer winding of the excitation transformer. The phase-shifting current fed back from each phase transformer (excluding the current phase) is also obtained. This ensures that the amplitude-modulated current is determined solely by the autotransformer winding of the current phase, while the phase-shifting current is provided independently by other phases. This decoupling of amplitude regulation and phase regulation is achieved at the source. Furthermore, based on the amplitude-modulated current and the primary winding of the series transformer, the voltage of the left half winding is induced through the left half winding of the secondary winding of the series transformer, and the voltage of the right half winding is induced through the right half winding of the secondary winding of the series transformer. These left and right half... The winding voltages are applied to both sides of the preset excitation point, providing a symmetrical physical basis for subsequent cancellation of coupling errors. The single target voltage of the transformer output for that phase is obtained by using the pre-acquired secondary winding impedance of the series transformer, the first branch current, the left half winding voltage, the original current, the original voltage, the phase-shifting current, and the right half winding voltage. This ensures that the amplitude adjustment amount from the amplitude modulation current and the phase adjustment amount from the phase-shifting current do not interfere with each other in the total target voltage. Finally, the total target voltage is obtained by combining the single target voltages of all phases, realizing the independent and stable adjustment of amplitude and phase of the phase-shifting transformer in two-dimensional power flow control, which significantly improves the stability of the transformation process.

[0007] Further, the step of obtaining the amplitude modulation current based on the second branch current, the primary winding of the excitation transformer, and the autotransformer winding of the excitation transformer, and obtaining the phase-shifting current fed back from the secondary winding of the excitation transformer of each phase transformer except for the transformer of that phase, includes: Based on the second branch current and the primary winding of the excitation transformer, an autotransformer voltage is generated in the autotransformer autotransformer winding. The amplitude modulation current is obtained based on the autotransformer winding voltage and the pre-acquired primary voltage of the series transformer; Obtain the phase-shifting current fed back by each transformer except the transformer described in this phase.

[0008] In the above scheme, the primary winding of the excitation transformer is driven by the current of the second branch, and the autotransformer voltage is generated in the autotransformer autotransformer. The amplitude modulation current is obtained by combining the primary winding voltage of the series transformer. At the same time, the phase shifting current fed back from the secondary winding of the excitation transformer of other phases is obtained, realizing the electrical decoupling of amplitude modulation and phase shifting from the source, laying the foundation for independent regulation.

[0009] Further, the step of generating an autotransformer winding voltage in the autotransformer autotransformer autotransformer based on the second branch current and the primary winding of the excitation transformer includes... The second branch current is input to the primary winding of the excitation transformer to obtain the voltage of the primary winding of the excitation transformer. The autotransformer winding voltage is obtained based on the preset autotransformer winding ratio and the primary winding voltage of the excitation transformer.

[0010] In the above scheme, by presetting the autotransformer winding ratio, the autotransformer winding voltage is accurately generated based on the primary winding voltage of the excitation transformer, ensuring that the amplitude modulation current is in phase with the main line voltage, realizing linear controllability of amplitude regulation, and improving amplitude modulation accuracy.

[0011] Further, the step of inducing the voltage of the left half winding through the left half winding of the secondary side of the series transformer based on the amplitude modulation current and the primary winding of the series transformer, and inducing the voltage of the right half winding through the right half winding of the secondary side of the series transformer, includes: The amplitude-modulated current is input to the primary winding of the series transformer to obtain the voltage of the primary winding of the series transformer. Based on the preset series transformer ratio and the voltage of the primary winding of the series transformer, the voltage of the left half winding is induced in the left half winding of the secondary side of the series transformer, and the voltage of the right half winding is induced in the right half winding of the secondary side of the series transformer.

[0012] In the above scheme, the primary winding of the series transformer is driven by the amplitude-modulated current, and the symmetrical voltage of the left half winding and the right half winding are obtained based on the preset series transformer ratio. This provides a symmetrical physical basis for error offsetting of the dual-core decoupling structure and eliminates the prerequisite for coupling error.

[0013] Further, the step of obtaining the single target voltage based on the pre-acquired secondary winding impedance of the series transformer, the first branch current, the left half winding voltage, the original current, the original voltage, the phase-shifting current, and the right half winding voltage includes: The excitation point voltage is obtained based on the impedance of the secondary winding of the series transformer, the total voltage of the left half winding, the original current, the original voltage, and the phase-shifting current. The single target voltage is obtained based on the impedance of the secondary winding of the series transformer, the current of the first branch, the excitation point voltage, the voltage of the right half winding, and the phase-shifting current.

[0014] In the above scheme, the excitation point voltage and single target voltage are calculated step by step, and the coupling error on the left and right sides is offset by relying on the impedance of the secondary winding of the series transformer, so as to eliminate the cross interference of amplitude modulation and phase shift and ensure the coupling-free adjustment of the single target voltage.

[0015] Further, the step of obtaining the excitation point voltage based on the impedance of the secondary winding of the series transformer, the total voltage of the left half winding, the original current, the original voltage, and the phase-shifting current includes: The first excitation intermediate data is obtained based on the original current and the impedance of the secondary winding of the series transformer. The second excitation intermediate data is obtained based on the sum of the first excitation intermediate data and the total voltage of the left half winding. Based on the difference between the original voltage and the second excitation intermediate data, the initial excitation point data is obtained; The excitation point voltage is obtained based on the phase-shifting current and the initial excitation point data.

[0016] In the above scheme, by calculating intermediate data step by step, the excitation point voltage is accurately synthesized based on the original current, the left half winding voltage, and the phase-shifting current, restoring the working state of the preset excitation point and realizing the accurate superposition of the amplitude modulation and phase shifting effect on the left side.

[0017] Further, obtaining the single target voltage based on the impedance of the secondary winding of the series transformer, the first branch current, the excitation point voltage, the right half winding voltage, and the phase-shifting current includes: The first target intermediate data is obtained based on the first branch current and the impedance of the secondary winding of the series transformer. Based on the sum of the first target intermediate data and the right half winding voltage, the second target intermediate data is obtained; The initial data for a single target is obtained based on the difference between the excitation point voltage and the intermediate data of the second target. The single-target voltage is obtained based on the phase-shifting current and the initial data of the single target.

[0018] In the above scheme, intermediate data is calculated step by step, the coupling error on the right side is offset by the impedance of the secondary winding of the series transformer, and a single target voltage is synthesized by combining the phase-shifting current, so as to achieve independent and stable adjustment of the amplitude and phase of the single target voltage and avoid parameter fluctuations during the adjustment process.

[0019] Another embodiment of the present invention provides a transformer control device applied to a phase-shifting transformer. The phase-shifting transformer includes a three-phase transformer, and for any single phase transformer, it includes a series transformer and an excitation transformer. The series transformer includes a primary winding, a left half winding of the secondary winding, and a right half winding of the secondary winding. The excitation transformer includes an autotransformer winding and an independent winding. The device includes: For any one phase of a phase-shifting transformer: The basic data acquisition module is used to acquire the original voltage and original current of the transformer in this phase. The current shunt module is used to divide the original current into a first branch current and a second branch current by a preset excitation point on the left half winding of the secondary side of the series transformer. The amplitude modulation phase-shifting current acquisition module is used to obtain the amplitude modulation current based on the second branch current, the primary winding of the excitation transformer and the autotransformer of the excitation transformer, and to obtain the phase-shifting current fed back by the secondary winding of the excitation transformer of each transformer except the transformer of the current phase. The left and right half-winding voltage acquisition module is used to obtain the left half-winding voltage through the left half-winding of the secondary side of the series transformer and the right half-winding voltage through the right half-winding of the secondary side of the series transformer based on the amplitude modulation current and the primary winding of the series transformer. The single-target voltage acquisition module is used to obtain the single-target voltage based on the pre-acquired impedance of the secondary winding of the series transformer, the first branch current, the voltage of the left half winding, the original current, the original voltage, the phase-shifting current, and the voltage of the right half winding. The total target voltage acquisition module is used to acquire the total target voltage output by the phase-shifting transformer based on the single target voltage output by the transformer in all phases of the phase-shifting transformer.

[0020] Another embodiment of the present invention provides a terminal device, including: 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, it implements the steps of the transformer control method of the present invention applied to a phase-shifting transformer.

[0021] Another embodiment of the present invention provides a computer-readable storage medium item, including: a stored computer program, which, when the computer program is running, controls the device where the computer-readable storage medium is located to perform the steps of the transformer control method of the present invention applied to a phase-shifting transformer. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic flowchart of a transformer control method for a phase-shifting transformer provided in an embodiment of the present invention; Figure 2 This is a single-phase circuit diagram of an error-counting phase-shifting transformer provided in an embodiment of the present invention; Figure 3 This is a system circuit diagram of an error-counting phase-shifting transformer provided in an embodiment of the present invention; Figure 4 This is a phasor diagram of an error-counteracting phase-shifting transformer provided in an embodiment of the present invention; Figure 5 This is a diagram showing the adjustment range of an error-counteracting phase-shifting transformer according to an embodiment of the present invention; Figure 6 This is a distribution diagram of adjustment points for an error-counteracting phase-shifting transformer according to an embodiment of the present invention; Figure 7 This is a topology diagram of an error-counting phase-shifting transformer provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a transformer control device applied to a phase-shifting transformer according to an embodiment of the present invention; Figure labels: 1: Series transformer; 2: Excitation transformer. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0030] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0031] See Figure 1 To address the aforementioned problems in the prior art, an embodiment of the present invention provides a transformer control method for a phase-shifting transformer. The phase-shifting transformer includes a three-phase transformer. For any single phase transformer, it includes a series transformer and an excitation transformer. The series transformer includes a primary winding, a left half-winding, and a right half-winding. The excitation transformer includes a primary winding, a secondary winding, and an autotransformer winding. The method includes: Step S1: For any one phase of a phase-shifting transformer: Step S11: Obtain the original voltage and original current of the transformer in this phase; Step S12: Divide the original current into the first branch current and the second branch current by setting the preset excitation point of the left half winding of the secondary side of the series transformer. Step S13: Obtain the amplitude modulation current and the phase shift current fed back by the secondary winding of the excitation transformer of each phase transformer except the transformer of the phase described above, based on the second branch current, the primary winding of the excitation transformer and the autotransformer of the excitation transformer. Step S14: Based on the amplitude modulation current and the primary winding of the series transformer, the voltage of the left half winding is induced through the left half winding of the secondary winding of the series transformer, and the voltage of the right half winding is induced through the right half winding of the secondary winding of the series transformer. Step S15: Obtain the single target voltage based on the pre-acquired secondary winding impedance of the series transformer, the first branch current, the left half winding voltage, the original current, the original voltage, the phase-shifting current, and the right half winding voltage. Step S2: Based on the single target voltage output by all phases of the phase-shifting transformer, obtain the total target voltage output by the phase-shifting transformer.

[0032] In the above scheme, the original current is divided into a first branch current and a second branch current at a preset excitation point. An amplitude-modulated current is obtained based on the second branch current, the primary winding of the excitation transformer, and the autotransformer winding of the excitation transformer. The phase-shifting current fed back from each phase transformer (excluding the current phase) is also obtained. This ensures that the amplitude-modulated current is determined solely by the autotransformer winding of the current phase, while the phase-shifting current is provided independently by other phases. This decoupling of amplitude regulation and phase regulation is achieved at the source. Furthermore, based on the amplitude-modulated current and the primary winding of the series transformer, the voltage of the left half winding is induced through the left half winding of the secondary winding of the series transformer, and the voltage of the right half winding is induced through the right half winding of the secondary winding of the series transformer. These left and right half... The winding voltages are applied to both sides of the preset excitation point, providing a symmetrical physical basis for subsequent cancellation of coupling errors. The single target voltage of the transformer output for that phase is obtained by using the pre-acquired secondary winding impedance of the series transformer, the first branch current, the left half winding voltage, the original current, the original voltage, the phase-shifting current, and the right half winding voltage. This ensures that the amplitude adjustment amount from the amplitude modulation current and the phase adjustment amount from the phase-shifting current do not interfere with each other in the total target voltage. Finally, the total target voltage is obtained by combining the single target voltages of all phases, realizing the independent and stable adjustment of amplitude and phase of the phase-shifting transformer in two-dimensional power flow control, which significantly improves the stability of the transformation process.

[0033] It should be noted that this invention addresses the technical problem of limited adjustment range and mutual coupling of amplitude and phase regulation in two-dimensional power flow control using existing phase-shifting transformers, and provides a transformer control method applied to phase-shifting transformers. The phase-shifting transformer includes a three-phase transformer, namely an A-phase transformer, a B-phase transformer, and a C-phase transformer. Each phase transformer includes a series transformer and an excitation transformer. The series transformer has a primary winding and a secondary winding, with the secondary winding comprising a left half winding and a right half winding. The excitation transformer has a primary winding, a secondary winding, and an autotransformer winding. Independent and stable regulation of single-phase and three-phase voltages is achieved through the following steps.

[0034] For any one phase of the phase-shifting transformer (taking phase A as an example), perform the following operation: First, obtain the initial voltage and initial current of the transformer in this phase. These initial voltage and initial current come from the transmission line and are the initial electrical quantities to be regulated.

[0035] Then, the original current is divided into a first branch current and a second branch current by a preset excitation point on the left half of the secondary winding of the series transformer. Specifically, the preset excitation point is located at the midpoint of the connection between the left half of the secondary winding and the right half of the series winding. After the original current flows into the left half winding, it is split at this point: the first branch current continues to flow to the right half winding, and the second branch current flows into the excitation transformer.

[0036] Next, the amplitude-modulated current is obtained based on the second branch current, the primary winding of the excitation transformer, and the autotransformer winding of the excitation transformer. The phase-shifting current fed back from the secondary winding of the excitation transformer of each phase transformer (excluding the transformer in this phase) is also obtained. Specifically, the second branch current flows into the primary winding of the excitation transformer, generating an amplitude-modulated current in the autotransformer winding through the electromagnetic effect of the primary winding. Simultaneously, phase-shifting currents are obtained from the excitation transformers of the other two phases (phase B and phase C), which are independently provided by the other phases.

[0037] Subsequently, based on the amplitude modulation current and the primary winding of the series transformer, the voltage of the left half winding is induced through the left half winding of the secondary winding of the series transformer, and the voltage of the right half winding is induced through the right half winding of the secondary winding of the series transformer.

[0038] Then, the pre-acquired impedance of the secondary winding of the series transformer, the first branch current, the voltage of the left half winding, the original current, the original voltage, the phase-shifting current, and the voltage of the right half winding are used to obtain the single target voltage. Since the relative positions of the amplitude-modulated component and the phase-shifting component obtained in the left half winding and the right half winding of the secondary winding of the series transformer are opposite, the additional coupling errors generated by the two offset each other, so that the amplitude of the single target voltage is determined only by the amplitude-modulated current and the phase is determined only by the phase-shifting current.

[0039] Finally, based on the single target voltages output by all phase transformers in the phase-shifting transformer (i.e., the single target voltages of phases A, B, and C respectively), the total target voltage output by the phase-shifting transformer is obtained, thus completing the two-dimensional power flow control of the three-phase line.

[0040] The following provides a more specific embodiment: The phase-shifting transformer in this invention is called an Error Hedging Phase Shifting Transformer (EHPST), and its specific topology is as follows: Figure 7 As shown. Reference Figure 2 In a phase-shifting transformer, the single-phase transformer can be structurally divided into an excitation transformer 2 and a series transformer 1. The excitation transformer 2 is a two-winding autotransformer. Its primary winding is a star-connected autotransformer winding, which is connected in parallel with the line to obtain three-phase excitation voltage to construct amplitude modulation voltage and phase-shifting voltage. There are taps on the excitation winding to form the excitation transformer autotransformer winding. The excitation transformer autotransformer winding obtains amplitude modulation voltage from the excitation voltage through voltage division. The excitation transformer autotransformer winding and its taps constitute the amplitude modulation unit of the phase-shifting transformer. The amplitude modulation voltages of the three-phase amplitude modulation units are respectively connected in series with their respective in-phase lines. Because the amplitude modulation voltage is in phase with the excitation voltage, and the excitation voltage is close to the phase with the line voltage, its superposition on the line voltage will mainly cause the voltage amplitude to change. The amplitude modulation function is achieved by controlling the taps of the amplitude modulation unit.

[0041] The excitation transformer 2 also includes a secondary winding of the excitation transformer, which is also connected in a star configuration. It obtains voltage through electromagnetic induction. The secondary winding of the excitation transformer and its tap positions constitute the phase-shifting unit of the phase-shifting transformer. Unlike the amplitude modulation unit, the voltage of the other two phase-shifting units besides the current phase is connected in series in a certain phase line. For example, the voltages of phase-shifting units B and C are connected in series in phase A. Since the three-phase excitation voltages are 120° apart, and the voltage amplitudes of the three-phase phase-shifting units are equal and the phase is the same as the three-phase excitation voltage, the phase-shifting voltage synthesized by the voltages of the two phase-shifting units in the line is perpendicular to the excitation voltage. Therefore, its superposition on the line voltage mainly causes a change in voltage phase. The phase-shifting function is achieved by controlling the tap positions of the phase-shifting units. The amplitude modulation voltage and phase shift voltage are introduced into the line through a series transformer 1. The primary winding and secondary winding of the series transformer are both three-phase independent windings. The left terminal of the primary winding of the series transformer is connected to the amplitude modulation unit of the same phase, and then to the phase shift unit of the leading phase. The right terminal of the primary winding of the series transformer is directly connected to the phase shift unit of the lagging phase. This connection method makes the primary winding of the series transformer connected in series with the amplitude modulation voltage and the phase shift voltage. Therefore, the voltage on it is the sum of the two. The secondary winding of the series transformer (including the left half winding and the right half winding of the secondary winding of the series transformer) is connected in series in the line. Through the electromagnetic induction effect of the series transformer, the amplitude modulation voltage and the phase shift voltage are introduced into the line. The fixed connector of the amplitude modulation unit is located at the middle position of the autotransformer winding. By controlling the relative position of the amplitude modulation unit to this position, the amplitude modulation voltage can be reversed. The phase shifting unit controls the winding grounding side through a single-pole double-throw switch, thereby controlling the phase shifting voltage. By controlling the inversion of amplitude modulation and phase shifting voltage, the selection of amplitude increase, amplitude decrease, and lead / lag functions can be achieved.

[0042] Simultaneously, the parallel connection point of the excitation transformer is the midpoint of the secondary side of the series transformer, which is used as the preset excitation point. Therefore, the amplitude modulation voltage and the phase shift voltage are split into two equal parts at this point, respectively connected in series to the left and right sides of the parallel connection point. Thus, the input voltage is first superimposed with half of the phase shift voltage and amplitude modulation voltage to become the excitation voltage, and then superimposed with the other half of the phase shift voltage and amplitude modulation voltage to form the output voltage. This is the dual-core decoupling structure. For traditional two-dimensional PSTs such as ST, the phase shift voltage and amplitude modulation voltage will interact to form an error phase shift angle, that is, amplitude modulation and phase shift will interfere with each other. Therefore, the degree of decoupling in two-dimensional regulation is low, and the regulation range deviates from the ideal supplementary voltage range. However, the amplitude modulation voltage on the autotransformer winding and the phase shift voltage on the secondary winding of the phase shift transformer are perpendicular to each other, and the interaction and error phase shift angle are weaker. At the same time, because of the dual-core decoupling structure, the phase shift voltage and amplitude modulation voltage are split into left and right parts, which are coupled to generate additional phase shift angles. Because the relative positions of the left and right amplitude modulation voltages and phase shift voltages are reversed, such as... Figure 4As shown in the phasor diagram, the directions of the additional phase shift angles generated on the left and right are always opposite, and the two can cancel each other out, thereby further significantly reducing the coupling degree between amplitude and phase. The linkage error between amplitude and phase is very small and can be ignored. EHPST almost achieves decoupling of amplitude and phase at the winding level, and can realize fixed ratio phase shift or fixed phase shift angle amplitude modulation. During the adjustment process, it will not have the problems of frequent parameter fluctuations, overshoot or even reverse bias that ST has.

[0043] The single-phase equivalent circuit diagram of a phase-shifting transformer is as follows: Figure 2 As shown, the phase shifting unit and amplitude modulation unit are represented by color blocks, where A, B, and C represent phase A, phase B, and phase C, respectively. Figure 2 Taking phase A as an example, the ellipsis at the bottom of the triangle corresponds to the top triangle, and the ellipsis on either side of the triangle represent similar structures in phases B and C. Similarly, the ellipsis on either side of the amplitude modulation (AM) unit and phase shifting unit also represent similar AM and phase shifting units in phases B and C. Taking phase A as an example, where... It is the original voltage of the transformer. It is the single-target voltage obtained after adjustment. It is the original current. It is the current in the first branch; It is the voltage on the primary winding of the excitation transformer (i.e., the voltage of the primary winding of the excitation transformer). It is the voltage on the secondary winding of the excitation transformer. It is the voltage on the excitation transformer autotransformer winding (i.e., the autotransformer winding voltage). It is the voltage of the primary winding of the series transformer (i.e., the primary voltage of the series transformer). It is the voltage on the secondary winding of the series transformer (including the voltage of the left half winding and the voltage of the right half winding). It is the current on the primary winding of the excitation transformer (i.e., the second branch current). It is the current (i.e., phase-shifting current) on the secondary winding of the excitation transformer. It is the current in the primary winding of the series transformer (i.e., the amplitude modulation current). It is the current on the secondary winding of the series transformer; It is the leakage impedance on the primary winding of the excitation transformer. ΔZ is the leakage impedance on the secondary winding of the excitation transformer, and ΔZ is the leakage impedance on the primary winding of the excitation transformer. It is the leakage impedance of the primary winding of the series transformer. It is the leakage impedance on the secondary winding of the series transformer (i.e., the impedance of the secondary winding of the series transformer). That is the voltage at the parallel connection point of the phase-shifting transformer (i.e., the preset excitation point). , and These are the turns ratios of the excitation transformer's secondary winding, the autotransformer winding, and the series transformer, respectively. It should be noted that R1 is the impedance of the left half of the secondary winding of the series transformer, with a value of... / 2; R2 is the impedance of the right half winding of the secondary side of the series transformer, with a value of / 2; L1 is the left half winding of the secondary side of the series transformer, and its voltage value is / 2; L1 is the right half winding of the secondary side of the series transformer, and its voltage value is / 2.

[0044] The direction of current flow and their relationships in a circuit are described below: Source-side raw current First, the current flows into the secondary winding of the series transformer. The voltage drop is generated by the leakage impedance and mutual inductance of the left half of the secondary winding, resulting in a voltage drop on the source side. The voltage drop is formed by superimposing this voltage drop. Then the source-side current At the excitation point, it decomposes into and ,in The current continues to flow through the other right half of the secondary winding of the series transformer, forming a voltage drop across its impedance and mutual inductance, and the excitation point voltage. The sum of these voltage drops forms the final single target voltage. ,and Then the current flows into the primary winding of the excitation transformer. The voltage drop generated by the leakage impedance and mutual inductance of the primary winding of the excitation transformer is equal to the excitation point voltage. .at the same time Current was induced in the autotransformer winding and the secondary winding of the excitation transformer through the electromagnetic interaction between the mutual inductance of the excitation transformer windings. and current ,in The impedance and mutual inductance flowing through the autotransformer winding of the excitation transformer and the impedance and mutual inductance of the primary winding of the series transformer, and The current only flows through the impedance and mutual inductance of the secondary winding of the excitation transformer. Because there is a line connection between the excitation transformer and the series transformer, it can be known that... The phase is just ahead The phase is 90° and the amplitude is The square root of three, at the same time The phase lead of the voltage drop caused by the impedance and mutual inductance flowing through the autotransformer winding and the primary winding of the series transformer is as follows: The phase of the voltage drop caused by the impedance and mutual inductance flowing through the secondary winding of the excitation transformer is 90°, while The magnitude of the voltage drop caused by the impedance and mutual inductance flowing through the autotransformer winding and the primary winding of the series transformer is... The voltage drop amplitude caused by the impedance and mutual inductance flowing through the secondary winding of the excitation transformer is √3 / 3. On the other hand... It also works through the electromagnetic interaction and current between the mutual inductance of the series transformer windings. and Phase induction.

[0045] Furthermore, refer to Figure 7 In the diagram, A, B, and C correspond to phases A, B, and C of the phase-shifting transformer, respectively. The three-phase structure is symmetrical. Each phase includes an excitation transformer 2 and a series transformer 1. a1 is the winding of the series transformer in phase A, and the upper winding of a1 corresponds to the phase A winding. Figure 2 The secondary winding of the series transformer (connected in series to the A-phase main line), the lower winding of a1 is the one corresponding to the A-phase winding. Figure 2 The series transformer primary winding is a1; a2 is the series transformer winding of phase B, the upper winding of a2 is the series transformer secondary winding of phase B, and the lower winding of a2 is the series transformer primary winding of phase B; a3 is the series transformer winding of phase C, the upper winding of a3 is the series transformer secondary winding of phase C, and the lower winding of a3 is the series transformer primary winding of phase C.

[0046] The blue area represents the amplitude modulation unit, which includes the primary winding and autotransformer winding of each phase of the excitation transformer. The corresponding relationships are as follows: b1 is the primary winding and autotransformer winding of phase A excitation transformer. The part of a1 (the primary winding of phase A series transformer) connected to b1 by the yellow line is the primary winding of excitation transformer, and the part of b1 with the tap is the autotransformer winding of excitation transformer. b2 is the primary winding and autotransformer winding of phase B excitation transformer. The part of a2 (the primary winding of phase B series transformer) connected to b2 by the green line is the primary winding of excitation transformer, and the part of b2 with the tap is the autotransformer winding of excitation transformer. b3 is the primary winding and autotransformer winding of the excitation transformer for phase C. The part of a3 (the primary winding of the C-phase series transformer) connected to b3 by the red line is the primary winding of the excitation transformer, and the part of b3 with the tap is the autotransformer winding. Each phase amplitude modulation unit adjusts the autotransformer winding ratio by switching taps to generate an amplitude modulation current in phase with the main line voltage, thus only achieving voltage amplitude regulation.

[0047] The green area represents the phase-shifting unit region, which contains the secondary windings of the excitation transformer for each phase. The corresponding relationships are as follows: c1 is the output winding of the A-phase amplitude modulation unit, corresponding to the output terminal of the A-phase amplitude modulation current. The amplitude modulation current generated by the excitation transformer autotransformer winding is connected to the A-phase series transformer. c2 is the output winding of the B-phase amplitude modulation unit, corresponding to the output terminal of the B-phase amplitude modulation current. The amplitude modulation current generated by the excitation transformer autotransformer winding is connected to the B-phase series transformer. c3 is the output winding of the C-phase amplitude modulation unit, corresponding to the output terminal of the C-phase amplitude modulation current. The amplitude modulation current generated by the excitation transformer autotransformer winding is connected to the C-phase series transformer. d1 is the secondary winding of the excitation transformer for phase A, d2 is the secondary winding of the excitation transformer for phase B, and d3 is the secondary winding of the excitation transformer for phase C. Each phase-shifting winding is connected across phases to allow the phase-shifting current fed back from the secondary windings of the excitation transformers of the other two phases (excluding the current phase) to be connected in series in a certain phase line, generating a phase-shifting voltage orthogonal to the main line voltage, thus only achieving voltage phase adjustment. The neutral point of the excitation transformer is grounded to provide a stable potential reference for the system.

[0048] Furthermore, according to Kirchhoff's laws, the voltage and current phasors of the system before and after compensation are: ; (1) ; (2) ; (3) ; (4) In another embodiment, obtaining the amplitude modulation current based on the second branch current, the primary winding of the excitation transformer, and the autotransformer winding of the excitation transformer, and acquiring the phase-shifting current fed back from the secondary winding of the excitation transformer of each phase transformer except for the transformer of that phase, includes: Based on the second branch current and the primary winding of the excitation transformer, an autotransformer voltage is generated in the autotransformer autotransformer winding. The amplitude modulation current is obtained based on the autotransformer winding voltage and the pre-acquired primary voltage of the series transformer; Obtain the phase-shifting current fed back by each transformer except the transformer described in this phase.

[0049] It should be noted that, therefore, based on the second branch current... and the primary winding of the excitation transformer, generating an autotransformer winding voltage in the autotransformer autotransformer winding. The principle is as follows: the second branch current flows into the primary winding of the excitation transformer. Due to the working principle of the autotransformer, a voltage proportional to the voltage on the primary winding of the excitation transformer will be induced at the tap portion of the autotransformer winding, i.e., the autotransformer winding voltage. Then, based on the autotransformer winding voltage and the pre-acquired primary voltage of the series transformer (i.e., the voltage across the primary winding of the series transformer), the amplitude modulation current is obtained through circuit superposition. Simultaneously, the phase-shifting current fed back from each of the other two phase transformers is obtained. These phase-shifting currents are generated by the independent windings of the other two phases through electromagnetic induction and fed back to this phase through specific wiring.

[0050] In another embodiment, generating an autotransformer winding voltage in the excitation transformer autotransformer autotransformer based on the second branch current and the primary winding of the excitation transformer includes: The second branch current is input to the primary winding of the excitation transformer to obtain the voltage of the primary winding of the excitation transformer. The autotransformer winding voltage is obtained based on the preset autotransformer winding ratio and the primary winding voltage of the excitation transformer.

[0051] It should be noted that the voltage and current relationships of each winding can be derived from the turns ratio of the excitation transformer: ; (5) ; (6) ; (7) The voltage of the autotransformer winding and the voltage on the secondary winding of the excitation transformer can be obtained from the above formula.

[0052] In another embodiment, the step of inducing the voltage of the left half winding through the left half winding of the secondary side of the series transformer based on the amplitude modulation current and the primary winding of the series transformer, and inducing the voltage of the right half winding through the right half winding of the secondary side of the series transformer, includes: The amplitude-modulated current is input to the primary winding of the series transformer to obtain the voltage of the primary winding of the series transformer. Based on the preset series transformer ratio and the voltage of the primary winding of the series transformer, the voltage of the left half winding is induced in the left half winding of the secondary side of the series transformer, and the voltage of the right half winding is induced in the right half winding of the secondary side of the series transformer.

[0053] It should be noted that the voltage and current relationships of each winding can be derived from the turns ratio of a series transformer: ; (8) ; (9) According to the preset series transformer ratio and the voltage of the primary winding of the series transformer A voltage is induced in the left half winding of the secondary side of the series transformer, and the value is... / 2, and the voltage of the right half winding is induced in the right half winding of the secondary side of the series transformer, the value of which is / 2. At the same time, it is necessary to follow... The constraint relationship.

[0054] In another embodiment, obtaining the single target voltage based on the pre-acquired series transformer secondary winding impedance, first branch current, left half winding voltage, original current, original voltage, phase-shifting current, and right half winding voltage includes: The excitation point voltage is obtained based on the impedance of the secondary winding of the series transformer, the total voltage of the left half winding, the original current, the original voltage, and the phase-shifting current. The single target voltage is obtained based on the impedance of the secondary winding of the series transformer, the current of the first branch, the excitation point voltage, the voltage of the right half winding, and the phase-shifting current.

[0055] In another embodiment, obtaining the excitation point voltage based on the impedance of the secondary winding of the series transformer, the total voltage of the left half winding, the original current, the original voltage, and the phase-shifting current includes: The first excitation intermediate data is obtained based on the original current and the impedance of the secondary winding of the series transformer. The second excitation intermediate data is obtained based on the sum of the first excitation intermediate data and the total voltage of the left half winding. Based on the difference between the original voltage and the second excitation intermediate data, the initial excitation point data is obtained; The excitation point voltage is obtained based on the phase-shifting current and the initial excitation point data.

[0056] In another embodiment, obtaining the single target voltage based on the impedance of the secondary winding of the series transformer, the first branch current, the excitation point voltage, the right half winding voltage, and the phase-shifting current includes: The first target intermediate data is obtained based on the first branch current and the impedance of the secondary winding of the series transformer. Based on the sum of the first target intermediate data and the right half winding voltage, the second target intermediate data is obtained; The initial data for a single target is obtained based on the difference between the excitation point voltage and the intermediate data of the second target. The single-target voltage is obtained based on the phase-shifting current and the initial data of the single target.

[0057] It should be noted that, as mentioned above, according to Kirchhoff's laws, the voltage and current phasors of the system before and after compensation have formulas (1)-(4). Therefore, according to... The excitation point voltage is obtained. The first excitation intermediate data is The second excitation intermediate data is .

[0058] according to To obtain the single target voltage The intermediate data for the first target is The intermediate data for the second objective is .

[0059] At the same time, in the process of seeking, it is necessary to abide by the following: ; .

[0060] Furthermore, the following demonstrates, through the relationship between various parameters, that the phase-shifting transformer in this scheme has independent amplitude and phase modulation functions: Considering that the phase-shifting transformer in this scheme only has a positive-sequence component during normal operation, the electrical connection of the amplitude modulation unit, the phase-shifting unit, and the primary winding of the series transformer under positive-sequence conditions can be obtained as follows: ; (10) ; (11) Where j is an imaginary number.

[0061] It can be described by a system of equations containing multiple variables, as shown in equations (1) to (11). After algebraic simplification, only... , and This allows us to decouple the input / output characteristics of the device: (12) (13) Where j is an imaginary number and e is a natural constant. K is the total turns ratio of the phase-shifting transformer, which is dominated by the autotransformer turns ratio of the amplitude modulation unit, but is also affected by the phase-shifting unit. Its value is: (14) This refers to the overall phase shift angle of the phase-shifting transformer. Its expression has two functional structures, both dominated by the secondary winding ratio of the excitation transformer of the phase-shifting unit, but also influenced by the amplitude modulation unit. The following also apply to it: (15) It is the overall internal impedance of the phase-shifting transformer, which is the leakage impedance of all windings multiplied by the action factor and then connected in series in the circuit. (16) Where A, B, C, D, and E are the contribution coefficients of each winding impedance in the total internal impedance: (17) (18) (19) (20) (twenty one) From equation (13), i.e., the input-output characteristic equation of the phase-shifting transformer, it can be seen that the phase-shifting transformer has the ability to regulate the amplitude of the node voltage due to the existence of K. The existence of the phase-shifting transformer enables it to regulate the phase of the system node voltage. The mathematical form of the input-output characteristics of the phase-shifting transformer proves that the device has amplitude modulation and phase modulation functions. According to equations (13) to (16), the equivalent circuit of EHPST in the system can be obtained, such as Figure 3 As shown, it can be seen that a phase-shifting transformer can be equivalent to an ideal transformer with a turns ratio of K and three phase-shifting angles of respectively. , and The phase shifter, along with its internal impedance, is connected in series, where the transformer and... The functions of the angle phase shifter are undertaken by the amplitude modulation unit and the phase shifting unit, respectively. and The phase shifter is generated by the additional phase shift effect caused by the amplitude modulation and phase shift voltage coupling on both sides of the parallel point, corresponding to the two function structures in equation (16). As in other two-dimensional PSTs, the presence of an additional phase shift angle will cause phase amplitude coupling, resulting in distortion of the shape of the adjustment range and the distribution of adjustment points.

[0062] Furthermore, Figure 3 It is an equivalent mathematical model of EHPST (Error-Hydraulic Phase-Shifting Transformer), used for theoretical analysis, deriving transfer functions, and verifying decoupling characteristics. It abstracts the complex physical coils into mathematical modules, and its core purpose is to prove that amplitude modulation and phase shifting can act independently with almost no coupling. Figure 3 The leftmost and rightmost gray areas refer to external components, including system power supply, system load, and system line impedance. and As input variables for this method, the blue area (the second colored area from the left) represents the equivalent module of the amplitude modulation unit, characterized by a transformation ratio of 1:K. Through the transformation ratio coefficient K, it achieves amplitude regulation in phase with the main line voltage, changing only the voltage magnitude without affecting the phase, thus establishing a decoupled basis for amplitude regulation from the source. The blue-purple area (the third colored area from the left) represents the additional phase shift effect generated by the coupling of amplitude modulation and phase shifting, namely β1 and β2. Therefore, this color is generated by the cross-mixing of the blue amplitude modulation effect and the green phase shifting effect on both sides, reflecting that the additional phase shifting effect is generated by the coupling of amplitude modulation and phase shifting. The green area (the fourth colored area from the left) represents the equivalent module of the phase shifting unit, characterized by a complex transformation ratio of 1:K. 1: 1: And the synthesized 1: Characterization, in which the total phase shift amount synthesized It only changes the voltage phase without affecting the amplitude, and is orthogonal to the amplitude modulation voltage output by the amplitude modulation unit, corresponding to the phase-shifting decoupling mechanism of this invention; the pink area (i.e., the fifth colored area from the left) is the internal impedance equivalent module, with... Characterization; the rightmost side is the system side with EHPST (the phase-shifting transformer of the present invention).

[0063] Based on the input-output characteristics of the phase-shifting transformer and its equivalent circuit in the system, the electrical phasor diagrams before and after adjustment, as well as the internal electrical phasor diagrams of the phase-shifting transformer, can be further drawn, such as... Figure 4 As shown, the blue sector (leftmost sector) represents the amplitude modulation unit, the green sector (second sector from the left) represents the phase shifting unit, and the pink sector (rightmost sector) represents the internal impedance. The blue-purple sector (third sector from the left) between the green and pink sectors also represents amplitude modulation. This is because the amplitude modulation function of the device is divided into two parts: the left blue sector represents pure amplitude modulation, while the blue-purple sector represents the area where the phase shifting region still exists. Therefore, mixing the green and blue sectors into a blue-purple area indicates that the right half of the amplitude modulation and phase shifting functions coexist. This is the compensation voltage injected by the phase-shifting transformer. From the phasor diagram, it can be seen that the voltage regulation of the phase-shifting transformer system can be divided into three parts: the amplitude modulation unit, the phase-shifting unit, and the internal impedance. The amplitude modulation unit, due to its symmetrical decoupling structure, is split into two parts, left and right, which couple with the phase-shifting unit to generate an additional phase shift angle. and , and These represent the phases of the system voltage before and after the amplitude modulation and phase shifting units are activated. The overall EHPST turns ratio K and overall phase shift angle can be derived from phasor geometry. With variation , Relationship between them: (twenty two) (twenty three) (twenty four) (25) As can be seen from the phasor geometry, the additional phase shift angle is caused by the inversion of the relative positions of the left and right amplitude modulation and phase shifting actions. and The directions are always opposite, and the two cancel each other out, significantly reducing the coupling between amplitude and phase. The linkage error between amplitude and phase is very small and can be ignored. EHPST almost achieves decoupling of amplitude and phase at the winding level, and can realize fixed ratio phase shift or fixed phase shift angle amplitude modulation. During the adjustment process, it will not have the problems of frequent parameter fluctuations, overshoot or even reverse bias that ST has. The adjustment is more flexible and safer.

[0064] Assuming the system voltage before adjustment is a per-unit value and neglecting the internal impedance of the phase-shifting transformer, the voltage phasor after adjustment is: Based on the actual needs of the power system and application cases of phase-shifting transformers, it is assumed that... The range is from -0.4 to 0.4. The range is from -0.2 to 0.2. Simultaneously affecting both amplitude modulation and phase shifting units and being fixed values, they are normalized. Then, according to equations (15) and (16), the per-unit range of the phase shifting transformer compensation voltage can be obtained, such as... Figure 5 As shown, the blue area represents the compensation voltage range, the red box represents the ideal adjustment requirement, and the horizontal axis represents... The amplitude modulation component (in-phase compensation voltage) is represented by a per-unit value (pu). The vertical axis represents... The phase-shifting component (orthogonal compensation voltage) is represented by a per-unit value (pu), where the imaginary unit j represents a 90° phase difference from the main voltage. It can be seen that the phase-shifting transformer closely approximates the ideal compensation voltage range, resembling a fan-shaped ring. Its upper and lower boundaries are approximately straight lines passing through the origin, while its left and right boundaries resemble circles centered at the origin. This boundary shape ensures excellent adjustment range, avoiding a large amount of ineffective adjustment area and adjustment points. The phase-shifting transformer exhibits very low parameter overshoot, ultimately achieving an adjustment range utilization rate of up to 97.5%. Furthermore, considering the simple structure and relatively few windings, coupled with optimal adjustment performance, its economic efficiency and feasibility are extremely high.

[0065] An equivalent simulation model of a phase-shifting transformer was built using relevant simulation software, such as the multi-winding transformer module in MATLAB / Simulink. The model employs a structure with 4 amplitude modulation units and 8 phase shifting units, generating a total of 153 adjustment points. The phase-shifting transformer simulation model was applied to a two-terminal power supply system, and the simulation parameters of the system and equipment are shown in the table below. Table 1 All 153 adjustment points obtained from the simulation were mapped to the polar coordinate system, and their actual distribution is as follows: Figure 6 As shown. The horizontal axis is... The amplitude modulation component (in-phase compensation voltage) is represented by a per-unit value (pu). The vertical axis represents... The phase-shifting component (orthogonal compensation voltage) is represented by a per-unit value (pu), with the imaginary unit j representing a 90° phase difference from the main voltage. The square represents the compensation voltage range, and the triangle represents the simulation adjustment points. It can be seen that the adjustment points are distributed roughly along both the circumference and inner diameter of the sector ring, meeting the ideal high decoupling requirements. When the adjustment points move along the phase-shifting circle, equal-phase amplitude modulation is achieved; when they move along the amplitude modulation circle, equal-amplitude phase shift is achieved. The adjustment is smooth and free, with minimal disturbance to the system. The simulated adjustment point distribution of the phase-shifting transformer perfectly matches the theoretical range, with boundaries almost coinciding. The error between the simulation and the theoretical range is very small, fully demonstrating the effectiveness of the optimized adjustment capability in this scheme.

[0066] In summary, this invention provides a novel phase-shifting transformer and a transformer control method applied to the phase-shifting transformer. By optimizing the excitation transformer into one with a primary winding, a secondary winding, and an autotransformer winding, an amplitude modulation unit is formed, consisting of the autotransformer winding and its tap positions. The autotransformer winding divides the excitation voltage to generate an amplitude modulation voltage and injects it into the line, achieving two-dimensional adjustment of amplitude and phase. Based on its simple structure, ease of implementation, and high economic efficiency, this invention more efficiently and independently regulates the active and reactive power flow on the line, and can be widely applied in power system power flow control operations. Meanwhile, by constructing the amplitude modulation voltage on the autotransformer winding and the phase shift voltage on the secondary winding of the excitation transformer to be perpendicular to each other, the interaction between the two is reduced, effectively weakening the coupling degree between the phase shift function and the amplitude modulation function. At the same time, by using a dual-core decoupling structure, the amplitude modulation voltage and the phase shift voltage are divided into two parts and connected in series on both sides of the parallel connection point of the excitation transformer. The amplitude modulation and phase shift voltages on both sides interact with each other, and the errors generated are opposite and offset, thereby significantly reducing the coupling degree of the two-dimensional regulation of the equipment. The shape of the equipment regulation range and the distribution of regulation points are significantly optimized, and it can be widely used in power system power flow control, voltage stabilization and loop closing operation.

[0067] like Figure 8 As shown, based on the above method embodiments, corresponding apparatus embodiments are provided; An embodiment of the present invention provides a transformer control device applied to a phase-shifting transformer. The phase-shifting transformer includes a three-phase transformer. For any single phase transformer, it includes a series transformer and an excitation transformer. The series transformer includes a primary winding, a left half winding of the secondary winding, and a right half winding of the secondary winding. The excitation transformer includes an autotransformer winding and an independent winding. The device includes: For any one phase of a phase-shifting transformer: The basic data acquisition module is used to acquire the original voltage and original current of the transformer in this phase. The current shunt module is used to divide the original current into a first branch current and a second branch current by a preset excitation point on the left half winding of the secondary side of the series transformer. The amplitude modulation phase-shifting current acquisition module is used to obtain the amplitude modulation current based on the second branch current, the primary winding of the excitation transformer and the autotransformer of the excitation transformer, and to obtain the phase-shifting current fed back by the secondary winding of the excitation transformer of each transformer except the transformer of the current phase. The left and right half-winding voltage acquisition module is used to obtain the left half-winding voltage through the left half-winding of the secondary side of the series transformer and the right half-winding voltage through the right half-winding of the secondary side of the series transformer based on the amplitude modulation current and the primary winding of the series transformer. The single-target voltage acquisition module is used to obtain the single-target voltage based on the pre-acquired impedance of the secondary winding of the series transformer, the first branch current, the voltage of the left half winding, the original current, the original voltage, the phase-shifting current, and the voltage of the right half winding. The total target voltage acquisition module is used to acquire the total target voltage output by the phase-shifting transformer based on the single target voltage output by the transformer in all phases of the phase-shifting transformer.

[0068] It is understood that the above-described device embodiments correspond to the method embodiments of the present invention, and can implement the transformer control method applied to a phase-shifting transformer provided by any of the above-described method embodiments of the present invention.

[0069] It should be noted that the device embodiments described above are merely illustrative, and some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can specifically be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0070] Based on the above embodiments of the transformer control method applied to phase-shifting transformers, 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, it implements the transformer control method applied to phase-shifting transformers according to any embodiment of the present invention.

[0071] For example, in this embodiment, the computer program can be divided into one or more modules, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in the terminal device.

[0072] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0073] The processor can be a Central Processing Unit (CPU), or 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. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0074] Based on the above-described method embodiments, another embodiment of the present invention provides a computer-readable storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to execute the transformer control method applied to a phase-shifting transformer as described in any of the above-described method embodiments of the present invention.

[0075] The modules / units integrated in the device / terminal equipment, if implemented as software functional units and sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0076] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A transformer control method applied to a phase-shifting transformer, characterized in that, The phase-shifting transformer includes a three-phase transformer. For any single-phase transformer, it includes a series transformer and an excitation transformer. The series transformer includes a primary winding, a left half winding, and a right half winding. The excitation transformer includes a primary winding, a secondary winding, and an autotransformer winding. The method includes: For any one phase of a phase-shifting transformer: Obtain the original voltage and original current of the transformer in this phase; The original current is divided into a first branch current and a second branch current by a preset excitation point on the left half winding of the secondary side of the series transformer. The amplitude modulation current is obtained based on the second branch current, the primary winding of the excitation transformer, and the autotransformer winding of the excitation transformer, and the phase shift current fed back by the secondary winding of the excitation transformer of each transformer except the transformer of that phase is obtained respectively. Based on the amplitude modulation current and the primary winding of the series transformer, the voltage of the left half winding is induced through the left half winding of the secondary winding of the series transformer, and the voltage of the right half winding is induced through the right half winding of the secondary winding of the series transformer. The single target voltage is obtained based on the pre-acquired impedance of the secondary winding of the series transformer, the current of the first branch, the voltage of the left half winding, the original current, the original voltage, the phase-shifting current, and the voltage of the right half winding. Based on the single target voltage output by all phases of the phase-shifting transformer, the total target voltage output by the phase-shifting transformer is obtained.

2. The transformer control method applied to a phase-shifting transformer according to claim 1, characterized in that, The process of obtaining the amplitude modulation current based on the second branch current, the primary winding of the excitation transformer, and the autotransformer winding of the excitation transformer, and obtaining the phase-shifting current fed back from the secondary winding of the excitation transformer of each phase transformer except for the transformer of that phase, includes: Based on the second branch current and the primary winding of the excitation transformer, an autotransformer voltage is generated in the autotransformer autotransformer winding. The amplitude modulation current is obtained based on the autotransformer winding voltage and the pre-acquired primary voltage of the series transformer; Obtain the phase-shifting current fed back by each transformer except the transformer described in this phase.

3. The transformer control method applied to a phase-shifting transformer according to claim 2, characterized in that, The step of generating an autotransformer winding voltage in the autotransformer autotransformer autotransformer based on the second branch current and the primary winding of the excitation transformer includes... The second branch current is input to the primary winding of the excitation transformer to obtain the voltage of the primary winding of the excitation transformer. The autotransformer winding voltage is obtained based on the preset autotransformer winding ratio and the primary winding voltage of the excitation transformer.

4. The transformer control method applied to a phase-shifting transformer according to claim 1, characterized in that, The step of inducing the voltage of the left half winding through the left half winding of the secondary side of the series transformer based on the amplitude modulation current and the primary winding of the series transformer, and inducing the voltage of the right half winding through the right half winding of the secondary side of the series transformer, includes: The amplitude-modulated current is input to the primary winding of the series transformer to obtain the voltage of the primary winding of the series transformer. Based on the preset series transformer ratio and the voltage of the primary winding of the series transformer, the voltage of the left half winding is induced in the left half winding of the secondary side of the series transformer, and the voltage of the right half winding is induced in the right half winding of the secondary side of the series transformer.

5. The transformer control method for a phase-shifting transformer according to claim 1, characterized in that, The process of obtaining a single target voltage based on the pre-acquired secondary winding impedance of the series transformer, the first branch current, the left half winding voltage, the original current, the original voltage, the phase-shifting current, and the right half winding voltage includes: The excitation point voltage is obtained based on the impedance of the secondary winding of the series transformer, the total voltage of the left half winding, the original current, the original voltage, and the phase-shifting current. The single target voltage is obtained based on the impedance of the secondary winding of the series transformer, the current of the first branch, the excitation point voltage, the voltage of the right half winding, and the phase-shifting current.

6. The transformer control method applied to a phase-shifting transformer according to claim 5, characterized in that, The process of obtaining the excitation point voltage based on the impedance of the secondary winding of the series transformer, the total voltage of the left half winding, the original current, the original voltage, and the phase-shifting current includes: The first excitation intermediate data is obtained based on the original current and the impedance of the secondary winding of the series transformer. The second excitation intermediate data is obtained based on the sum of the first excitation intermediate data and the total voltage of the left half winding. Based on the difference between the original voltage and the second excitation intermediate data, the initial excitation point data is obtained; The excitation point voltage is obtained based on the phase-shifting current and the initial excitation point data.

7. The transformer control method applied to a phase-shifting transformer according to claim 5, characterized in that, The process of obtaining the single target voltage based on the impedance of the secondary winding of the series transformer, the first branch current, the excitation point voltage, the right half winding voltage, and the phase-shifting current includes: The first target intermediate data is obtained based on the first branch current and the impedance of the secondary winding of the series transformer. Based on the sum of the first target intermediate data and the right half winding voltage, the second target intermediate data is obtained; The initial data for a single target is obtained based on the difference between the excitation point voltage and the intermediate data of the second target. The single-target voltage is obtained based on the phase-shifting current and the initial data of the single target.

8. A transformer control device, characterized in that, This device is applied to a phase-shifting transformer, which includes a three-phase transformer. For any single-phase transformer, it includes a series transformer and an excitation transformer. The series transformer includes a primary winding, a left half-winding of the secondary winding, and a right half-winding of the secondary winding. The excitation transformer includes an autotransformer winding and an independent winding. The device includes: For any one phase of a phase-shifting transformer: The basic data acquisition module is used to acquire the original voltage and original current of the transformer in this phase. The current shunt module is used to divide the original current into a first branch current and a second branch current by a preset excitation point on the left half winding of the secondary side of the series transformer. The amplitude modulation phase-shifting current acquisition module is used to obtain the amplitude modulation current based on the second branch current, the primary winding of the excitation transformer and the autotransformer of the excitation transformer, and to obtain the phase-shifting current fed back by the secondary winding of the excitation transformer of each transformer except the transformer of the current phase. The left and right half-winding voltage acquisition module is used to obtain the left half-winding voltage through the left half-winding of the secondary side of the series transformer and the right half-winding voltage through the right half-winding of the secondary side of the series transformer based on the amplitude modulation current and the primary winding of the series transformer. The single-target voltage acquisition module is used to obtain the single-target voltage based on the pre-acquired impedance of the secondary winding of the series transformer, the first branch current, the voltage of the left half winding, the original current, the original voltage, the phase-shifting current, and the voltage of the right half winding. The total target voltage acquisition module is used to acquire the total target voltage output by the phase-shifting transformer based on the single target voltage output by the transformer in all phases of the phase-shifting transformer.

9. A terminal device, characterized in that, The method includes 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, it implements the transformer control method for a phase-shifting transformer as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, include: A stored computer program, wherein, when the computer program is executed, it controls the device containing the computer-readable storage medium to perform the transformer control method for a phase-shifting transformer as described in any one of claims 1-7.

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