Amplitude-phase decoupling regulation transformer control method, transformer, system and device

Abstract

The present invention provides a control method, transformer, system and equipment for an amplitude-phase decoupling regulation transformer, including using a directional function to determine a voltage regulation instruction value and a controllable voltage vector after amplitude-phase decoupling regulation; searching for a voltage regulation instruction point among multiple voltage-adjustable vector points in a voltage vector space; the voltage-adjustable vector point is formed by superimposing a gear combination of three groups of on-load tap-changing switches; determining the voltage gear of each switch corresponding to the voltage regulation instruction point to control a three-phase parallel transformer; the present invention obtains multiple voltage-adjustable vector points by superimposing any combination of the voltage gears of the three groups of on-load tap-changing switches, and voltage amplitude-phase decoupling regulation can be achieved when selecting a voltage regulation instruction point among multiple voltage-adjustable vector points; at the same time, the real-time power value is corrected by the directional function to obtain a voltage regulation instruction, thereby achieving directional, precise and rapid optimization; at the same time, the on-load tap-changing switch can achieve cross-voltage gear regulation through only two gear driving devices, thereby avoiding excessive control quantity.

Description

Technical Field

[0001] The present invention belongs to the technical field of power equipment and test platform equipment, and specifically relates to a control method for an amplitude-phase decoupling regulation transformer, a transformer, a system and equipment. Background Art

[0002] As the construction of new power systems continues to advance, power grids, especially distribution networks, are evolving from traditional, simple energy distribution networks to integrated, interactive power generation, grid-load, and storage, and flexible coupling with higher-level power grids. Their role in facilitating the local consumption of distributed power sources and carrying new loads is becoming increasingly prominent. The operating characteristics of distribution networks are becoming increasingly complex, placing increasing demands on their flexible voltage and phase regulation, impedance regulation, and power flow control capabilities.

[0003] To meet these practical needs, existing transformer voltage regulation technology can achieve voltage adjustment without power outages by combining multiple winding taps with on-load tap changers and series-parallel power electronic converters. However, traditional regulation devices have exposed many drawbacks in terms of integration and control. For example, ① traditional phase shifters often suffer from amplitude-phase coupling, making it difficult to achieve independent control of voltage amplitude and phase angle, and unable to meet the grid's requirements for flexible regulation of multiple physical quantities; ② their control process suffers from long calculation times, unstable operation, multiple adjustment steps, and large target vector deviations, making it difficult to accurately control voltage amplitude and phase. Therefore, it is urgent to solve these problems and provide strong support for the stable and efficient operation of new power systems. Summary of the Invention

[0004] In order to overcome the shortcomings of low flexibility and low accuracy of transformer control in the above-mentioned prior art, the present invention proposes a transformer control method with amplitude-phase decoupling regulation, comprising:

[0005] Based on the real-time power value and power command value of the three-phase parallel transformer, a preset direction function is used to determine the voltage regulation command value after amplitude-phase decoupling regulation;

[0006] Subtracting the voltage regulation command value from the system real-time voltage vector to obtain a controllable voltage vector;

[0007] Mapping the controllable voltage vector into a voltage vector space, and using the voltage-adjustable vector point in the voltage vector space that is the smallest distance from the endpoint of the controllable voltage vector as a voltage regulation command point; wherein the voltage-adjustable vector point is formed by superimposing the output voltages after voltage level adjustment by an on-load tap-regulating switch of a secondary winding of the current phase, an on-load tap-regulating switch of a secondary winding of a lagging phase, and an on-load tap-regulating switch of a secondary winding of a leading phase, which are sequentially connected in series at the input end of each phase of the three-phase shunt transformer;

[0008] Based on the voltage regulation command point, the voltage levels of the on-load tap-regulating switch of the secondary winding of the current phase, the on-load tap-regulating switch of the secondary winding of the lagging phase and the on-load tap-regulating switch of the secondary winding of the leading phase corresponding to the voltage regulation command point are determined, and the three-phase parallel transformer is controlled according to the voltage levels.

[0009] Preferably, the method of determining the voltage regulation command value after amplitude-phase decoupling regulation based on the real-time power value and the power command value of the three-phase parallel transformer and using a preset direction function includes:

[0010] Calculate the power deviation based on the real-time power value and power command value of the three-phase parallel transformer;

[0011] When the power deviation is greater than a set deviation threshold, substituting the real-time power value and the power command value into a preset direction function to calculate a power direction change coefficient;

[0012] determining an adjustment amount of a voltage amplitude or a voltage phase of the three-phase parallel transformer based on the power direction variation coefficient and the power deviation;

[0013] The voltage amplitude adjustment amount or the voltage phase adjustment amount is superimposed on the system real-time voltage vector to obtain a voltage adjustment command value after amplitude-phase decoupling adjustment.

[0014] Preferably, the power direction variation coefficient is expressed as:

[0015] ;

[0016] in, detection represents the power direction change coefficient, represent the active power and reactive power of the power command value respectively, 、 Respectively represent the active power and reactive power of the real-time power value; α represents the rate of change of active power relative to voltage amplitude, β represents the rate of change of active power relative to voltage phase, γ represents the rate of change of reactive power relative to voltage amplitude, and σ represents the rate of change of reactive power relative to voltage phase; represents the weight coefficient of α, represents the weight coefficient of β, represents the weight coefficient of γ, represents the weight coefficient of σ.

[0017] Preferably, determining the adjustment amount of the voltage amplitude or the voltage phase of the three-phase parallel transformer based on the power direction variation coefficient and the power deviation includes:

[0018] determining an adjustment direction of a voltage amplitude or a voltage phase of the three-phase parallel transformer based on a relationship between the power direction variation coefficient and a set coefficient threshold;

[0019] determining an adjustment step of a voltage amplitude or a voltage phase of the three-phase parallel transformer based on a deviation level of the power deviation;

[0020] The adjustment direction and adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer are combined to obtain the adjustment amount of the voltage amplitude or voltage phase of the three-phase parallel transformer.

[0021] Preferably, determining the adjustment direction of the voltage amplitude or the voltage phase of the three-phase parallel transformer based on the relationship between the power direction variation coefficient and the set coefficient threshold includes:

[0022] Based on the relationship between the power direction change coefficient and the set coefficient threshold, when the power direction change coefficient is greater than 1, the voltage amplitude of the three-phase parallel transformer is negatively adjusted; when the power direction change coefficient is less than -1, the voltage amplitude is positively adjusted; when the power direction change coefficient is between 0 and 1, the voltage phase of the three-phase parallel transformer is negatively adjusted; when the power direction change coefficient is between -1 and 0, the voltage phase is positively adjusted.

[0023] Preferably, determining the adjustment step of the voltage amplitude or the voltage phase of the three-phase parallel transformer based on the deviation level of the power deviation includes:

[0024] Based on the deviation level of the power deviation, when the power deviation is a level one deviation, setting the adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer to one unit step of the voltage amplitude or the voltage phase;

[0025] When the power deviation is a secondary deviation, the adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer is set to twice the unit step of the voltage amplitude or the voltage phase;

[0026] When the power deviation is a third-level deviation, the adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer is set to three times the unit step of the voltage amplitude or the voltage phase;

[0027] The deviation ranges of the first-level deviation, the second-level deviation and the third-level deviation increase in sequence.

[0028] Preferably, the on-load tap-changing switches of the secondary windings of the three-phase parallel transformer are driven synchronously, the on-load tap-changing switches of the lagging secondary windings of the three-phase parallel transformers are driven synchronously, and the on-load tap-changing switches of the leading secondary windings of the three-phase parallel transformers are driven synchronously.

[0029] Based on the same inventive concept, the present invention also provides an amplitude-phase decoupling regulating transformer, comprising: a three-phase parallel transformer and a current-phase secondary winding on-load tap-regulating switch, a lagging-phase secondary winding on-load tap-regulating switch, and a leading-phase secondary winding on-load tap-regulating switch connected in series at the input end of each phase of the three-phase parallel transformer;

[0030] Each of the on-load tap-changing switches realizes cross-voltage gear adjustment through two gear drive devices;

[0031] The on-load tap-changing switches of the secondary windings of the three-phase parallel transformers are synchronously driven, the on-load tap-changing switches of the secondary windings of the lagging phases of the three-phase parallel transformers are synchronously driven, and the on-load tap-changing switches of the secondary windings of the leading phases of the three-phase parallel transformers are synchronously driven;

[0032] The amplitude-phase decoupling regulating transformer is used to implement the above-mentioned amplitude-phase decoupling regulating transformer control method.

[0033] Preferably, the on-load tap-changing switch comprises at least one static contact unit and two movable contact mechanisms that slide independently on the static contact unit, and the two movable contact mechanisms are correspondingly connected to the two gear driving devices;

[0034] The static contact unit includes three static contacts, which are correspondingly connected to multiple asymmetric taps of the secondary winding of the three-phase parallel transformer. All the static contacts are arranged in a ring array, and there is a distance between two adjacent static contacts.

[0035] Each of the moving contact mechanisms realizes an uninterrupted conductive connection switching with each of the static contacts during the sliding process; the moving contact mechanism is connected to the output end of the on-load tap-changing switch.

[0036] Preferably, each of the static contacts has two conductive surfaces, and the two conductive surfaces of all the static contacts respectively form two circumferential surfaces, and the two moving contact mechanisms slide independently along the two circumferential surfaces.

[0037] Preferably, each of the moving contact mechanisms comprises a rotating disk coaxially arranged with the circumferential surface, a transition current limiter conductively connected and fixed to the rotating disk, an adaptive nonlinear voltage limiter, and a metal pole;

[0038] The transition current limiter, the adaptive nonlinear voltage limiter and one end of the metal pole are arranged in sequence along the circumferential direction of the turntable, and the other ends of the transition current limiter, the adaptive nonlinear voltage limiter and the metal pole are in sliding contact with the conductive surface; the spacing between the transition current limiter and the metal pole is smaller than the width of the conductive surface and greater than the set electrical insulation clearance; the turntable is connected to the output end of the on-load tap-changer.

[0039] Preferably, when the voltage between the adaptive nonlinear voltage limiter and the static contact in contact with it is greater than or equal to a set voltage protection value, the impedance of the adaptive nonlinear voltage limiter is less than a set impedance lower limit value;

[0040] When the voltage between the adaptive nonlinear voltage limiter and the static contact in contact with the adaptive nonlinear voltage limiter is lower than the voltage protection value, the impedance of the adaptive nonlinear voltage limiter is higher than a set impedance upper limit value.

[0041] Preferably, when the number of the static contact units is two or more, the three static contacts in each static contact unit are coded in ascending order, and the multiple static contact units are coded cyclically. The static contacts with the same coding in each static contact unit are connected through an interconnected busbar, and after connection, the static contacts with the same coding are correspondingly connected to the three input ends of the on-load tap-changing switch, and the three input ends are correspondingly connected to multiple asymmetric taps of the secondary winding of the three-phase parallel transformer.

[0042] Based on the same inventive concept, the present invention also provides an amplitude-phase decoupling regulation transformer control system, comprising:

[0043] An instruction calculation module is used to determine a voltage regulation instruction value after amplitude-phase decoupling regulation based on the real-time power value and power instruction value of the three-phase parallel transformer and a preset direction function;

[0044] a data processing module, configured to obtain a controllable voltage vector by subtracting the voltage regulation command value from the system real-time voltage vector;

[0045] an instruction determination module, configured to map the controllable voltage vector into a voltage vector space, and to use as a voltage regulation instruction point the voltage-adjustable vector point in the voltage vector space that is the smallest distance from the endpoint of the controllable voltage vector; wherein the voltage-adjustable vector point is formed by superimposing the output voltages of the on-load tap-regulating switches of the secondary winding of the current phase, the secondary winding of the lagging phase, and the secondary winding of the leading phase, which are sequentially connected in series at the input end of each phase of the three-phase shunt transformer, after voltage level adjustment;

[0046] A control module is used to determine the voltage levels of the on-load tap-regulating switch of the secondary winding of the current phase, the on-load tap-regulating switch of the secondary winding of the lagging phase, and the on-load tap-regulating switch of the secondary winding of the leading phase corresponding to the voltage regulation command point based on the voltage regulation command point, and control the three-phase parallel transformer according to the voltage levels.

[0047] Based on the same inventive concept, the present invention also provides a computer device, comprising: one or more processors;

[0048] a memory for storing one or more programs;

[0049] When the one or more programs are executed by the one or more processors, the aforementioned amplitude-phase decoupling regulation transformer control method is implemented.

[0050] Based on the same inventive concept, the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed, the aforementioned amplitude-phase decoupling regulation transformer control method is implemented.

[0051] Compared with the closest prior art, the present invention has the following beneficial effects:

[0052] The present invention provides an amplitude-phase decoupling regulation transformer control method and system, including determining a voltage regulation instruction value after amplitude-phase decoupling regulation based on the real-time power value and power command value of a three-phase parallel transformer, using a preset direction function; subtracting the voltage regulation instruction value from the system real-time voltage vector to obtain a controllable voltage vector; mapping the controllable voltage vector into a voltage vector space, and taking the voltage-adjustable vector point in the voltage vector space with the smallest distance from the end point of the controllable voltage vector as a voltage regulation instruction point; wherein the voltage-adjustable vector point is formed by superimposing the output voltages after voltage gear adjustment of the on-load tap-regulating switch of the secondary winding of the current phase, the on-load tap-regulating switch of the secondary winding of the lagging phase, and the on-load tap-regulating switch of the secondary winding of the leading phase, which are sequentially connected in series at the input end of each phase of the three-phase parallel transformer; determining the voltage regulation instruction point based on the voltage regulation instruction point. The method and system obtain a plurality of voltage-adjustable vector points by arbitrarily combining and superimposing the voltage gears of the three groups of on-load tap-changing switches, and realize voltage amplitude-phase decoupling regulation when selecting the voltage regulation command point among the plurality of voltage-adjustable vector points; at the same time, the real-time power value is corrected by the direction function to obtain the voltage regulation command, which can realize directional, precise and rapid optimization, and the control process is simple. It is possible to quickly and accurately complete the power flow distribution regulation without obtaining the detailed impedance and load parameters of the system power grid line, thereby avoiding the process control problems such as long calculation time, unstable action process, many adjustment steps, and large target vector deviation in the control process.

[0053] The present invention also provides an amplitude-phase decoupling regulation transformer, comprising a three-phase parallel transformer and a current-phase secondary winding on-load voltage regulating switch, a lagging-phase secondary winding on-load voltage regulating switch and a leading-phase secondary winding on-load voltage regulating switch connected in series at the input end of each phase of the three-phase parallel transformer; each of the on-load voltage regulating switches realizes cross-voltage gear adjustment through two gear driving devices; the current-phase secondary winding on-load voltage regulating switches of each phase of the three-phase parallel transformer are synchronously driven, the lagging-phase secondary winding on-load voltage regulating switches of each phase are synchronously driven, and the leading-phase secondary winding on-load voltage regulating switches of each phase are synchronously driven; the transformer combines three groups of on-load voltage regulating switches with the three-phase parallel transformer, and appears to be a special transformer to the outside, and the three groups of on-load voltage regulating switches are synchronously driven. The voltage regulating switch does not increase additional loss, and avoids the need to design a separate regulating switch system outside the transformer, and avoids the need for auxiliary systems such as heat dissipation designed in conjunction with the transformer; at the same time, the on-load voltage regulating switch can achieve cross-voltage gear adjustment through only two gear driving devices, and the on-load voltage regulating switches driven synchronously by each phase are automatically grouped, so that only two control quantities are needed to control a group of switches. Therefore, the entire control process of direct voltage regulation or current regulation only needs to determine six drive control quantities, which solves the problem that traditional regulating devices require a large number of windings, taps and on-load voltage regulating switches when a wider adjustment range is required. The overall structure of the device is compact, economical, small in footprint, highly reliable, and low in loss, and has important promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A schematic flow chart of a method for controlling a transformer with amplitude-phase decoupling regulation provided by the present invention;

[0055] Figure 2 A schematic diagram of the distribution of voltage-adjustable vector points in the voltage vector space provided by the present invention;

[0056] Figure 3 A schematic diagram of the structure of an amplitude-phase decoupling regulation transformer provided by the present invention;

[0057] Figure 4 A schematic diagram of the overall control process of a transformer control method for amplitude-phase decoupling regulation provided by the present invention;

[0058] Figure 5 A schematic diagram of the control flow of the directional optimization method provided by the present invention;

[0059] Figure 6 A schematic diagram of the vector relationship between the output voltage of the regulating transformer and the system voltage provided by the present invention;

[0060] Figure 7 Schematic diagram comparing the method of the present invention and the traditional method;

[0061] Figure 8A schematic structural diagram of the on-load tap-changing switch provided by the present invention;

[0062] Figure 9 for Figure 8 Schematic diagram of the positional relationship among the intermediate transition current limiter Z1, the transition current limiter Z2, the adaptive nonlinear voltage limiter BV1, the adaptive nonlinear voltage limiter BV2, the metal pole P1, and the metal pole P2;

[0063] Figure 10 A schematic diagram of the input and output states of an amplitude-phase decoupling regulation transformer provided by the present invention;

[0064] Figure 11 A partial schematic diagram of the sliding switching process of the moving contact mechanism provided by the present invention;

[0065] Figure 12 A schematic diagram of the structure of an amplitude-phase decoupling regulation transformer control system provided by the present invention;

[0066] Figure 13 A schematic diagram of the structure of an electronic device provided by the present invention;

[0067] Among them, 1. Moving contact mechanism; 2. Static contact; 3. Rotary disk; 4. Transition current limiter; 5. Adaptive nonlinear voltage limiter; 6. Metal pole; 7. Controller; 8. Gear drive device; 9. Interconnecting busbar. DETAILED DESCRIPTION

[0068] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0069] Example 1:

[0070] Based on the same inventive concept, the present invention also provides a method for controlling an amplitude-phase decoupling regulating transformer, such as Figure 1 As shown, including:

[0071] S1. Based on the real-time power value and power command value of the three-phase parallel transformer, a preset direction function is used to determine the voltage regulation command value after amplitude-phase decoupling regulation;

[0072] S2. Subtract the voltage regulation command value from the system real-time voltage vector to obtain a controllable voltage vector;

[0073] S3. Mapping the controllable voltage vector into a voltage vector space, and using the voltage-adjustable vector point in the voltage vector space that is the smallest distance from the endpoint of the controllable voltage vector as a voltage regulation command point; wherein the voltage-adjustable vector point is formed by superimposing the output voltages after voltage level adjustment by an on-load tap-regulator (OLT) of a secondary winding of the current phase, an on-load tap-regulator (OLT) of a secondary winding of a lagging phase, and an on-load tap-regulator (OLT) of a secondary winding of a leading phase, which are sequentially connected in series at the input end of each phase of the three-phase shunt transformer;

[0074] S4. Based on the voltage regulation command point, determine the voltage levels of the on-load tap-regulating switch of the secondary winding of the current phase, the on-load tap-regulating switch of the secondary winding of the lagging phase, and the on-load tap-regulating switch of the secondary winding of the leading phase corresponding to the voltage regulation command point, and control the three-phase parallel transformer according to the voltage levels.

[0075] Considering the shortcomings of existing transformer control technologies, which suffer from low flexibility and accuracy, the present invention utilizes a specific connection method for three on-load tap-changers connected in series per phase. This allows for multiple voltage-adjustable vector points to be obtained when any combination of the three on-load tap-changer positions is superimposed. This provides a basis for amplitude-phase decoupling regulation. Furthermore, voltage amplitude-phase decoupling regulation can be achieved when selecting a voltage regulation command point from among the multiple voltage-adjustable vector points, providing greater control flexibility. Furthermore, by correcting the real-time power value using a directional function to obtain a voltage regulation command, this allows for precise and rapid directional optimization. The control process is simple, and power flow distribution regulation can be quickly and accurately completed without obtaining detailed impedance and load parameters of the system's power grid lines. This avoids process control issues such as long calculation time, unstable operation, multiple adjustment steps, and large target vector deviations. This system can be used in power system voltage / power flow regulation, flexible grid operation mode control, short-circuit current suppression, and power supply voltage regulation in industrial and commercial scenarios.

[0076] For example, each on-load tap-changer has seven voltage gears, namely 0, ±1, ±2, and ±3. Each voltage gear corresponds to a different output voltage. The voltage gears of the three on-load tap-changers in each phase are superimposed on each other vectorially to synthesize 127 voltage vectors with different amplitudes and phases, namely voltage adjustable vector points. The vector is synthesized by three-phase voltages with different amplitudes and directions. The distribution of multiple voltage adjustable vector points in the voltage vector space, namely the vector diagram, is shown as follows: Figure 2 As shown in the figure, when the number of voltage levels of the on-load tap changer increases, the number of voltage adjustable vector points will also increase adaptively. Figure 2 As can be seen, the voltage amplitude and phase can be independently controlled, thus achieving amplitude-phase decoupling regulation, facilitating flexible voltage regulation and power flow control in the power grid. Based on the amplitude-phase decoupling characteristics shown in the voltage vector diagram, a voltage vector control method can be designed to control the transformer.

[0077] The relationship between the vector points on the positive sequence coordinate axis and the voltage gear in the voltage vector space is shown in Table 1. In Table 1, other position vector points can be synthesized by the vectors on the coordinate axis. Among them, taking the compensation voltage of phase A in the synthesized three-phase as an example, a represents the voltage gear of the on-load tap-changing switch of the secondary winding of the current phase, b represents the voltage gear of the on-load tap-changing switch of the secondary winding of the lagging phase, and c represents the voltage gear of the on-load tap-changing switch of the secondary winding of the leading phase. Figure 2Taking the red compensation voltage vector in as an example, the gear position corresponding to the synthesis of this vector is (2, -1, 0).

[0078] Table 1 Relationship between vector points on the positive sequence coordinate axis and voltage levels

[0079]

[0080] It should be noted that, for the A-phase compensation voltage, phase A is the current phase voltage, phase B is the phase voltage with an angle difference of -120°, and phase C is the phase voltage with an angle difference of 120°; for the B-phase compensation voltage, phase B is the current phase voltage, phase C is the phase voltage with an angle difference of -120°, and phase A is the phase voltage with an angle difference of 120°; for the C-phase compensation voltage, phase C is the current phase voltage, phase A is the phase voltage with an angle difference of -120°, and phase B is the phase voltage with an angle difference of 120°; that is, when phase A is the current phase, phase B is the lagging term, and phase C is the leading phase; when phase B is the current phase, phase C is the lagging term, and phase A is the leading phase; when phase C is the current phase, phase A is the lagging term, and phase B is the leading phase.

[0081] Therefore, if Figure 3 As shown, each phase A, B, and C has its own on-load tap-changer for the secondary winding of the current phase, the on-load tap-changer for the secondary winding of the lagging phase, and the on-load tap-changer for the secondary winding of the leading phase. The entire regulating transformer has a total of 9 on-load tap-changers.

[0082] In this embodiment, the on-load tap-changing switches of the secondary windings of the three-phase parallel transformers are driven synchronously, the on-load tap-changing switches of the lagging secondary windings of the three-phase parallel transformers are driven synchronously, and the on-load tap-changing switches of the leading secondary windings of the three-phase parallel transformers are driven synchronously.

[0083] It should be noted that multiple synchronously driven on-load tap changers are automatically grouped. Specifically, Figure 3 As shown, each group of switches of the compact amplitude-phase decoupling regulation transformer is a matrix fast on-load tap-regulating switch, which is an integrated structure of A, B, and C phases, and each group of matrix fast on-load tap-regulating switches can realize three-phase synchronous step-length regulation. The on-load tap-regulating switches of the secondary windings of each phase constitute the first group of switches, specifically the first group of matrix fast on-load tap-regulating switches. The on-load tap-regulating switches of the secondary windings of the lagging phases of each phase constitute the second group of switches, specifically the second group of matrix fast on-load tap-regulating switches. The on-load tap-regulating switches of the secondary windings of the leading phases of each phase constitute the third group of switches, specifically the third group of matrix fast on-load tap-regulating switches. In order to make each group of switches more clearly displayed in the drawing, Figure 3In the figure, each group of switches is arranged in a row. At this time, the input terminals of the first group of matrix fast on-load tap-changing switches are respectively connected to the upper secondary windings of the three-phase A, B, and C of the transformer. The input terminals of the second group of matrix fast on-load tap-changing switches are respectively connected to the middle secondary windings of the three-phase A, B, and C of the transformer. The input terminals of the third group of matrix fast on-load tap-changing switches are respectively connected to the lower secondary windings of the three-phase A, B, and C of the transformer. However, the actual installation and connection are not limited to this method.

[0084] In the above-mentioned connection mode of the three groups of switches, the input terminal of phase A is connected in series with the on-load tap-regulating switch of the secondary winding of the current phase, the on-load tap-regulating switch of the secondary winding of the lagging phase, and the on-load tap-regulating switch of the secondary winding of the leading phase. The specific connection mode is as follows: the first group of switches is connected to the output terminal of the on-load tap-regulating switch of the phase A winding, the second group of switches is connected to the output terminal of the on-load tap-regulating switch of the phase B winding, and the third group of switches is connected to the output terminal of the on-load tap-regulating switch of the phase C winding. These are connected end to end in sequence, with the head end formed by the connection being connected to the input terminal of phase A of the transformer (and also connected to the input terminal of the primary phase A winding of the transformer), and the tail end formed by the connection being used as the output terminal A' of phase A of the transformer.

[0085] The B-phase input terminal is connected in series with the on-load tap-regulating switch of the secondary winding of the current phase, the on-load tap-regulating switch of the secondary winding of the lagging phase, and the on-load tap-regulating switch of the secondary winding of the leading phase in a specific connection manner: the first group of switches is connected to the output end of the on-load tap-regulating switch of the B-phase winding, the second group of switches is connected to the output end of the on-load tap-regulating switch of the C-phase winding, and the third group of switches is connected to the output end of the on-load tap-regulating switch of the A-phase winding. The ends are connected end to end in sequence, and the head end formed by the connection is connected to the B-phase input terminal of the transformer (and also connected to the input end of the B-phase winding of the primary side of the transformer), and the tail end formed by the connection serves as the B-phase output terminal B' of the transformer;

[0086] The C-phase input terminal is connected in series with the on-load tap-regulating switch of the secondary winding of the current phase, the on-load tap-regulating switch of the secondary winding of the lagging phase, and the on-load tap-regulating switch of the secondary winding of the leading phase in a specific connection manner: the first group of switches is connected to the output end of the on-load tap-regulating switch of the C-phase winding, the second group of switches is connected to the output end of the on-load tap-regulating switch of the A-phase winding, and the third group of switches is connected to the output end of the on-load tap-regulating switch of the B-phase winding. The ends are connected end to end in sequence, and the head end formed by the connection is connected to the C-phase input terminal of the transformer (and also connected to the input end of the C-phase winding of the primary side of the transformer), and the tail end formed by the connection serves as the C-phase output terminal C' of the transformer;

[0087] After establishing the above connection, adjusting the three groups of switches enables flexible decoupled adjustment of the input voltage's amplitude and phase angle. Existing similar solutions require at least six controllable switches per winding phase on each layer of the transformer's secondary side, totaling 6*9=54 controllable switches. The control system and its auxiliary drive system for controlling 54 switches are extremely complex and have poor feasibility. In this embodiment, however, each on-load tap changer utilizes two gear drive devices to achieve cross-voltage gear adjustment, enabling independent adjustment of any amplitude and angle (within the design range) in a single step. This decoupled adjustment significantly simplifies control complexity. In this case, the synchronous drive configuration of a group of switches requires only two control variables to control the group. Therefore, the entire control process for direct voltage regulation or power flow control requires only six drive control variables. Compared to the aforementioned control system for controlling 54 switches, the control process is simpler and more straightforward, with improved feasibility.

[0088] like Figure 4 As shown, based on actual application requirements, the control functions can be divided into two categories: direct voltage regulation and power flow control. Direct voltage regulation determines the voltage level of each on-load tap changer based on the voltage to be adjusted. Power flow control uses the power command value to autonomously determine the voltage regulation command, thereby changing the power flow distribution of the closed-loop system line (such as the closed-loop system of two interconnected lines in a power grid). The control algorithm is required to find the voltage regulation command corresponding to the power flow command value, and then use the voltage regulation command to determine the voltage level of each on-load tap changer (the new level). Finally, the switch is controlled based on the control variable corresponding to the new level to achieve the output.

[0089] When performing power flow control, since the known quantity during power flow control is the power command value, and the transformer achieves power flow control by adjusting the output voltage, in order to achieve power flow control, it is necessary to determine the voltage adjustment command value based on the power command value. In the process of determining the voltage adjustment command value, based on the connection method of the three on-load tap changers described above, combined with the command calculation of the direction function, amplitude-phase decoupling regulation can be achieved. In this embodiment, the above-mentioned S1 may include the following when determining the voltage adjustment command value after amplitude-phase decoupling regulation:

[0090] S101, calculating a power deviation based on a real-time power value and a power command value of a three-phase parallel transformer;

[0091] S102: When the power deviation is greater than a set deviation threshold, substituting the real-time power value and the power command value into a preset direction function to calculate a power direction change coefficient;

[0092] S103. Determine an adjustment amount of the voltage amplitude or voltage phase of the three-phase parallel transformer based on the power direction variation coefficient and the power deviation;

[0093] S104 : Superimposing the voltage amplitude adjustment amount or the voltage phase adjustment amount on the system real-time voltage vector to obtain a voltage adjustment command value after amplitude-phase decoupling adjustment.

[0094] Specifically, in the above S101, before calculating the power deviation, the initial amplitude of the initial voltage of the three-phase parallel transformer must be obtained. and initial phase , the active power and reactive power in the power command value, and the three-phase voltage and current sampling values; the active power and reactive power in the real-time power value are calculated based on the three-phase voltage and current sampling values; the calculation process of the active power and reactive power in the real-time power value satisfies the following formula:

[0095]

[0096] in, 、 represent the active power and reactive power of the real-time power value respectively, Respectively represent the three-phase voltage sampling values ​​of A, B, and C, Respectively represent the sampling values ​​of the three-phase current of A, B, and C.

[0097] Then, define the power deviation, that is, the deviation coefficient Indicates the difference between real-time power and power instruction; deviation coefficient The calculation process satisfies the following formula:

[0098]

[0099] In the above S102, the magnitude of the power deviation is determined according to the set deviation threshold. For example, the deviation threshold is set to 0.05; Is it true? If so, considering the time-varying nature of the real-time power and the power command, no voltage adjustment is performed and the above step S101 is repeated. Otherwise, the subsequent steps of S102 are executed to calculate the power direction variation coefficient.

[0100] Taking into account the amplitude-phase decoupling characteristics of the transformer, according to the changing relationship between active power, reactive power and voltage amplitude u and phase angle θ, a direction function is constructed to obtain the power direction change coefficient. According to the power direction change coefficient and power deviation, the initial amplitude of the output voltage, i.e. the initial voltage, is determined. and initial phase The amplitude of the voltage regulation command value after the amplitude-phase decoupling adjustment is changed and phase The required adjustment amount is used to adjust the current real-time power to the direction of the power instruction, and after adjustment, S101 and the judgment of the power deviation size are repeated.

[0101] In this embodiment, the process of obtaining the power direction change coefficient in the above S102 is expressed as follows:

[0102] ;

[0103] in, detection represents the power direction change coefficient, represent the active power and reactive power of the power command value respectively, 、 Respectively represent the active power and reactive power of the real-time power value; α represents the rate of change of active power relative to voltage amplitude, β represents the rate of change of active power relative to voltage phase, γ represents the rate of change of reactive power relative to voltage amplitude, and σ represents the rate of change of reactive power relative to voltage phase; represents the weight coefficient of α, represents the weight coefficient of β, represents the weight coefficient of γ, represents the weight coefficient of σ.

[0104] In this embodiment, when calculating the adjustment amount, the above S103 may include:

[0105] S1031. Determine an adjustment direction of the voltage amplitude or voltage phase of the three-phase parallel transformer based on a relationship between the power direction change coefficient and a set coefficient threshold;

[0106] S1032. Determine an adjustment step of a voltage amplitude or a voltage phase of the three-phase parallel transformer based on a deviation level of the power deviation;

[0107] S1033: Combine the adjustment direction and adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer to obtain an adjustment amount of the voltage amplitude or voltage phase of the three-phase parallel transformer.

[0108] In this embodiment, the above S1031 includes:

[0109] Based on the relationship between the power direction change coefficient and the set coefficient threshold, when the power direction change coefficient is greater than 1, the voltage amplitude of the three-phase parallel transformer is negatively adjusted; when the power direction change coefficient is less than -1, the voltage amplitude is positively adjusted; when the power direction change coefficient is between 0 and 1, the voltage phase of the three-phase parallel transformer is negatively adjusted; when the power direction change coefficient is between -1 and 0, the voltage phase is positively adjusted.

[0110] In this embodiment, the above S1032 includes:

[0111] Based on the deviation level of the power deviation, when the power deviation is a level one deviation, setting the adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer to one unit step of the voltage amplitude or the voltage phase;

[0112] When the power deviation is a secondary deviation, the adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer is set to twice the unit step of the voltage amplitude or the voltage phase;

[0113] When the power deviation is a third-level deviation, the adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer is set to three times the unit step of the voltage amplitude or the voltage phase;

[0114] The deviation ranges of the first-level deviation, the second-level deviation and the third-level deviation increase in sequence.

[0115] Specifically, the calculation process of the adjustment direction and adjustment step size satisfies the following formula:

[0116] When the output result of the direction function, i.e., the power direction change coefficient, is greater than 1, the voltage amplitude is adjusted negatively, which is expressed as: ;

[0117] When the power direction change coefficient is less than -1, the voltage amplitude is adjusted in the positive direction, which is expressed as: ;

[0118] When the power direction variation coefficient is between 0 and 1, the voltage phase is adjusted negatively, that is, the phase angle is reduced, which is expressed as: ;

[0119] When the power direction variation coefficient is between -1 and 0, the voltage phase is adjusted in the positive direction, that is, the phase angle increases, which is expressed as: .

[0120] in, represents the initial amplitude, represents the initial phase, and Respectively represent the amplitude and phase of the voltage regulation command value after amplitude-phase decoupling regulation, is the unit step size of voltage amplitude adjustment, is the unit step size of voltage phase angle adjustment, step size coefficient and coefficient of variation Positive correlation. That is, when the power deviation is the first level deviation, ;when That is, when the power deviation is a secondary deviation, ;when That is, when the power deviation is level 3, .

[0121] The above process of determining the voltage regulation command value from the power command value is formed as follows: Figure 5 The directed optimization method shown.

[0122] When applied to direct system voltage regulation, the voltage regulation command is a known quantity, eliminating the need for a directional function calculation. After receiving the voltage regulation command, steps S2 through S4 are executed to determine the voltage range of the on-load tap changer (OTC). The output is then generated based on the drive control variable corresponding to the voltage range, achieving regulation targeting system voltage or power flow. After regulation is complete, the deviation coefficient is recalculated to check whether the regulation result meets the requirements. Generally, a single adjustment is sufficient to achieve desired control.

[0123] Specifically, the voltage adjustment instruction determines the voltage gear of the on-load tap changer by using the direct voltage adjustment method, which is essentially a table lookup method. According to the voltage adjustment instruction, the three groups of switch gears closest to the instruction are found. Figure 6 The vector relationship between the regulating transformer output voltage and the system voltage is illustrated in FIG.

[0124] Figure 6 middle, is the system voltage, i.e. the real-time voltage vector of the system, To adjust the target voltage, that is, the voltage adjustment command value, u is the voltage regulation command amplitude, θ The voltage regulation command angle is the phase angle difference between the target voltage and the system voltage. The voltage regulator outputs a controllable voltage. That is, the controllable voltage vector, the controllable voltage vector and After superposition with The system voltage can be adjusted to the target voltage by adjusting the voltage control command value. With the original system voltage Calculated by difference Map to the preset vector point and its corresponding output voltage relationship, and calculate the relationship between each vector point and The vector point with the smallest distance from the end point is the voltage regulation command point, thereby obtaining the three-phase voltage gear that synthesizes the voltage regulation command point.

[0125] by Figure 6 Take the blue voltage regulation instruction as an example, the difference The amplitude is 3 times the voltage regulation step, and the phase angle is 60°. Therefore, the green point corresponds to the output voltage regulation command point. The gear is the current phase energy voltage 0 gear, the angle difference of -120° is the lagging phase energy voltage -3 gears, and the angle difference of 120° is the leading phase energy voltage 0 gear.

[0126] Figure 7The figure shows a comparison between the traditional method and the directional optimization method. Given multiple switching paths between the initial gear and the gear corresponding to the power command, the directional optimization method can quickly switch from the initial gear to the gear corresponding to the power command, eliminating the need for step-by-step adjustments as with the traditional method. Furthermore, when the current power differs significantly from the command, the present invention allows for cross-level adjustments, further improving response time.

[0127] Example 2:

[0128] The present invention provides an amplitude-phase decoupling regulating transformer, such as Figure 3 and Figure 8 As shown, it includes: a three-phase parallel transformer and a current phase secondary winding on-load tap-regulating switch, a lagging phase secondary winding on-load tap-regulating switch and a leading phase secondary winding on-load tap-regulating switch connected in series at each phase input end of the three-phase parallel transformer;

[0129] Each of the on-load tap-changing switches realizes cross-voltage gear adjustment through two gear drive devices 8;

[0130] The on-load tap-changing switches of the secondary windings of the three-phase parallel transformers are synchronously driven, the on-load tap-changing switches of the secondary windings of the lagging phases of the three-phase parallel transformers are synchronously driven, and the on-load tap-changing switches of the secondary windings of the leading phases of the three-phase parallel transformers are synchronously driven;

[0131] The amplitude-phase decoupling regulating transformer is used to implement the amplitude-phase decoupling regulating transformer control method in the above embodiment.

[0132] Considering that traditional regulating devices often require an increased number of windings, taps, and on-load tap changers to achieve a wider adjustment range, this results in larger cores, bulkier transformers, more on-load tap changer wiring, more control variables, and a complex overall structure. Furthermore, the on-load tap changers used cannot achieve cross-range adjustment, resulting in slow adjustment speeds. As output capacity and adjustment range continue to increase, the size and weight of the device will increase dramatically, taking up a lot of space and causing significant inconvenience in installation, transportation, and subsequent maintenance, while also significantly increasing costs. This solution combines three groups of on-load tap-changers with a three-phase parallel transformer. The three groups of switches and the transformer windings can be integrated into one and placed in the same transformer oil tank, which appears to be a special transformer. The three groups of on-load tap-changers do not increase additional losses. At the same time, it avoids the need to design a separate regulating switch system outside the transformer and avoids the need for auxiliary systems such as heat dissipation to be designed synchronously. At the same time, the on-load tap-changers can achieve cross-voltage gear adjustment through only two gear drive devices. The on-load tap-changers driven synchronously by each phase are automatically grouped, so that only two control quantities are needed to control a group of switches. Therefore, the entire control process of direct voltage regulation or flow control only needs to determine six drive control quantities. The control process is simpler and clearer, and has better feasibility. It solves the problem that traditional regulating devices require a large number of windings, taps and on-load tap-changers when a wider adjustment range is required. The overall structure of the device is compact, economical, small in footprint, highly reliable, and low in loss, and has important promotion value.

[0133] In this embodiment, Figure 8 As shown, the on-load tap-changing switch comprises at least one static contact unit and two movable contact mechanisms 1 that slide independently on the static contact unit, and the two movable contact mechanisms 1 are correspondingly connected to the two gear driving devices;

[0134] The static contact unit includes three static contacts 2, which are correspondingly connected to multiple asymmetric taps of the secondary winding of the three-phase parallel transformer. All the static contacts 2 are arranged in a ring array, and there is a distance between two adjacent static contacts.

[0135] Each of the moving contact mechanisms 1 realizes an uninterrupted conductive connection switching with each of the static contacts 2 during the sliding process; the moving contact mechanism 1 is connected to the output end of the on-load tap-changer.

[0136] The on-load tap-changing switch of the present invention matches the number of static contacts and moving contact mechanisms, has the independent movement characteristics of the two moving contact mechanisms, and has the characteristics of all static contacts being arranged in a circular array, so that the two moving contact mechanisms can each slide to the static contact of any potential within one step. By connecting the static contacts of multiple potentials in pairs, the three input ends are coordinated to form seven voltage adjustment gears, thereby realizing variable step voltage regulation and switching between any voltage adjustment gears in one step, solving the shortcomings of traditional on-load tap-changing switches such as the inability to achieve cross-gear regulation, rapid regulation, and variable step regulation; it also solves the problems of a large number of switches, large space occupied, and inability to be integrated with other primary equipment such as transformers when using multiple ordinary external switches to achieve rapid on-load regulation. It is used in application fields such as voltage / current / power regulation of transmission / distribution networks and railway traction, new energy stations, industrial and commercial power supply voltage regulation, load voltage regulation, and smelting process regulation.

[0137] In this embodiment, each of the static contacts 2 has two conductive surfaces, and the two conductive surfaces of all the static contacts 2 form two circumferential surfaces respectively. The two moving contact mechanisms 1 slide independently along the two circumferential surfaces respectively.

[0138] It should be noted that all the static contact units constitute a static contact mechanism, the two circumferential surfaces are the two circumferential surfaces of the static contact mechanism, and the number of static contacts 2 in the static contact mechanism is 3*N, N≥1, where N is the number of static contact units;

[0139] In this embodiment, Figure 8 As shown, the static contact 2 is a double-sided static contact, which includes an inner static contact and an outer static contact. The contacts on both sides are directly connected by a conductor, forming an I-shaped structure to form an integral body, and have the same potential. In addition, the inner static contact, the outer static contact and the conductor can also be the inner and outer conductive surfaces of the same conductor.

[0140] All the static contacts 2 form a ring, the outer conductive surface or the outer static contact forms the outer circumferential surface of the ring, the inner conductive surface or the inner static contact forms the inner circumferential surface of the ring, and the two moving contact mechanisms 1 are respectively arranged on the inner and outer sides of the ring, in a three-layer sleeve type arrangement, with a compact installation structure and a reasonable layout;

[0141] In another possible implementation, the two circumferential surfaces are located on the same side of the ring, i.e., the outside or inside; the two circumferential surfaces have the same diameter and are arranged in layers; in this case, the two moving contact mechanisms 1 are located on the same side of the ring and are arranged in a two-layer sleeve-type arrangement with the static contact mechanism, and the two moving contact mechanisms 1 are arranged in layers corresponding to the two circumferential surfaces;

[0142] In another possible implementation, the two circumferential surfaces are provided on two opposite wide surfaces of the ring; in this case, a moving contact mechanism 1, a static contact mechanism and another moving contact mechanism 1 are arranged in sequence along the axial direction of the static contact mechanism.

[0143] In this embodiment, each of the moving contact mechanisms 1 includes a rotary disk 3 coaxially arranged with the circumferential surface, a transition current limiter 4 conductively connected and fixed to the rotary disk 3, an adaptive nonlinear voltage limiter 5, and a metal pole 6;

[0144] The transition current limiter 4, the adaptive nonlinear voltage limiter 5 and one end of the metal pole 6 are arranged in sequence along the circumferential direction of the turntable 3, and the other ends of the transition current limiter 4, the adaptive nonlinear voltage limiter 5 and the metal pole 6 are in sliding contact with the conductive surface; the spacing between the transition current limiter 4 and the metal pole 6 is smaller than the width of the conductive surface and greater than the set electrical insulation clearance; the turntable 3 is connected to the output end of the on-load tap-changer.

[0145] It should be noted that the three layout relationships between the two moving contact mechanisms 1 and the static contact mechanism mentioned above can be regarded as the three layout relationships between the two turntables 3 in the two moving contact mechanisms 1 and the static contact mechanism. The transition current limiter 4, the adaptive nonlinear voltage limiter 5 and the metal pole 6 constitute a sliding mechanism. The sliding mechanism is arranged between the turntable 3 and the static contact mechanism, and slides with the conductive surface of the static contact 2.

[0146] In this embodiment, the two rotating disks 3 in the two moving contact mechanisms 1 are respectively recorded as the inner rotating disk and the outer rotating disk. Both rotating disks 3 can rotate clockwise and counterclockwise. The inner / outer rotating disks serve as the two output terminals of the on-load tap-changing switch. Figure 9 As shown, the transition current limiter 4 includes a transition current limiter Z1 and a transition current limiter Z2, the adaptive nonlinear voltage limiter 5 includes an adaptive nonlinear voltage limiter BV1 and an adaptive nonlinear voltage limiter BV2, and the metal pole 6 includes a metal pole P1 and a metal pole P2; Z1, BV1 and P1 constitute an inner sliding mechanism arranged on the inner turntable, and Z2, BV2 and P2 constitute an outer sliding mechanism arranged on the outer turntable.

[0147] The transition impedance, i.e., the transition current limiter 4, has the characteristic of limiting current and is composed of an element with resistance, inductance, or capacitance characteristics. One end of the transition impedance is fixedly and conductively connected to the rotary disk 3, and the other end is connected to a conductive sliding block, which is used to slide in contact with the static contact 2.

[0148] The metal pole 6 is made of a metal material with good conductive properties, such as a copper conductor, one end of which is fixedly connected to the rotary disk 3 and the other end is connected to a conductive sliding block for sliding contact with the static contact 2 .

[0149] One end of the adaptive nonlinear voltage limiter 5 is fixedly and conductively connected to the rotary disk 3, and the other end is connected to the conductive sliding block, which is used to slide in contact with the static contact 2 to achieve overvoltage protection;

[0150] In another possible implementation, the sliding mechanism may only use the transition current limiter 4 and the metal pole 6, which can also achieve uninterrupted switching of conductive connections with each of the static contacts 2 during the sliding process and one-step switching between any voltage adjustment gears, but this may easily cause the transition current limiter 4 to fuse.

[0151] In this embodiment, the adaptive nonlinear voltage limiter 5 is arranged between the transition current limiter 4 and the metal pole 6, which can achieve protection against overvoltage and prevent the transition current limiter 4 from fusing.

[0152] In this embodiment, when the voltage between the adaptive nonlinear voltage limiter 5 and the static contact 2 in contact with it is greater than or equal to the set voltage protection value, the impedance of the adaptive nonlinear voltage limiter 5 is less than the set impedance lower limit value;

[0153] When the voltage between the adaptive nonlinear voltage limiter 5 and the static contact 2 in contact with it is lower than the voltage protection value, the impedance of the adaptive nonlinear voltage limiter 5 is higher than the set impedance upper limit value.

[0154] Specifically, the adaptive nonlinear voltage limiter 5 has an overvoltage protection characteristic of limiting voltage, which is used to protect against overvoltage when the switch is abnormal. During the switching process, for example, only the transition resistor, that is, the transition current limiter 4 branch, is supplying power, such as when the metal pole 6 may be between the two static contacts, that is, in a suspended state. If the transition impedance burns out due to overcurrent or other reasons, the entire power supply circuit will be in an open circuit state. That is, it is easy for an excessive voltage to appear between the moving and static contacts, exceeding the set voltage protection value, and causing an overvoltage breakdown hazard. The voltage protection value is usually designed to be a transition range, such as 1800V~2200V. For example, the pole voltage between the moving and static contacts is 600V under normal circumstances. When the voltage between the moving and static contacts exceeds or equals 2200V, the adaptive nonlinear voltage limiter 5 automatically adjusts the impedance characteristics. It presents a low impedance characteristic, and the voltage between the moving and static contacts is limited to a safe range of 2200V; if it is lower than 1800V, that is, the adaptive nonlinear voltage limiter 5 presents a high impedance characteristic, it can be understood that the state between the moving and static contacts is not changed at this time, and the voltage between the moving and static contacts is less than 1800V; if it is between 1800V and 2200V, it is in a transition resistance state, and the voltage between the moving and static contacts is limited to 1800V and 2200V. If the control device detects that the voltage between the moving and static contacts is in a state of 600V to 2200V, it can be determined that there is a problem with the transition circuit of the moving contact, and switching needs to be stopped; it solves the safety problems of traditional on-load tap-changing switches that cannot achieve overvoltage damage to the switch and transformer short circuit after the switch regulation circuit is disconnected.

[0155] In this embodiment, the adaptive nonlinear voltage limiter 5 includes the following:

[0156] Zener diodes, thyristors, and varistors.

[0157] In this embodiment, when the number of the static contact units is two or more, the three static contacts 2 in each static contact unit are coded in order from small to large, and the multiple static contact units are coded cyclically. The static contacts 2 with the same coding in each static contact unit are connected through an interconnected bus 9. After connection, the static contacts 2 with the same coding are correspondingly connected to the three input ends of the on-load tap-changing switch, and the three input ends are correspondingly connected to multiple asymmetric taps of the secondary winding of the three-phase parallel transformer.

[0158] Specifically, at this time, all the static contacts 2 are arranged in a circular form, and each static contact 2 is also an electrode. Each static contact / electrode is encoded using a specific cyclic encoding form, and the encoding method is a cyclic method along the circumferential direction, which can be clockwise or counterclockwise, such as Figure 8As shown, all the static contacts 2 are cyclically encoded in a clockwise direction along the circumference as follows: ①, ②, ③, ①, ②, ③... The total number of electrodes, i.e., all the static contacts 2, is 3*N, N ≥ 1, where N is the number of static contact units; Figure 8 The codes ①, ②, and ③ are both the numbers of the static contact 2 where the codes are located and the numbers of the interconnecting bus 9 where the codes are located;

[0159] The static contacts / electrodes with the same code are connected through a conductive interconnecting busbar 9 and have the same potential. The number of interconnecting busbars 9 is the same as the number of types of static contact codes. The interconnecting busbars 9 include interconnecting busbars ①, interconnecting busbars ②, and interconnecting busbars ③, and each interconnecting busbar is independent of each other. After the interconnection, a terminal is led out. The terminal code is the same as the static contact / electrode code. At the same time, this terminal serves as the input end of the switch and is used to connect to the power supply or transformer winding. Figure 8 As shown, all electrodes with code ① are connected via interconnect bus ①, all electrodes with code ② are connected via interconnect bus ②, and all electrodes with code ③ are connected via interconnect bus ③. After connection, terminals 1, 2, and 3 are led out as input terminals ①, ②, and ③, respectively.

[0160] At this time, a set of moving contacts can be set at the position with the same static contact number, or only the moving contact structure that contacts the static contact can be set; the connection method and action method of each set of moving contacts are exactly the same, and mutual backup can be achieved during operation. If one or two sets of moving contacts have poor contact or abnormal contact, the device can still operate normally, which greatly improves the service life of the entire on-load tap-changing switch and the reliability of the overall equipment.

[0161] In this embodiment, two gear drive devices 8 and a controller 7 electrically connected to the gear drive devices 8 constitute the control device. The gear drive devices 8 respectively drive the inner and outer rotary disks, thereby interlocking with the aforementioned sliding mechanism to achieve gear shifting. The controller 7 is used to implement the amplitude-phase decoupling regulation transformer control method described in the aforementioned embodiment, providing drive instructions to the gear drive devices 8 and also identifying and processing various states within the switch.

[0162] like Figure 3 As shown, the two gear drive devices 8 are divided into an inner gear drive device and an outer gear drive device. In a group of switches of the above-mentioned regulating transformer, the inner turntables of each group of three on-load tap-changing switches share an inner gear drive device, and the outer turntables share an outer gear drive device. Therefore, each group of switches has only two control quantities, and these two control quantities can be synchronized and effective, and can realize switching between any gears in one step, providing a feasible basis for simplifying the overall control.

[0163] In actual use of the present invention, the on-load tap-changing switch connected to the secondary winding of phase A in the first group of switches is taken as an example. The secondary winding of phase A has three taps. The three input terminals of the on-load tap-changing switch are correspondingly connected to the three taps to take out different voltages, such as Figure 10 As shown, a voltage u1 is connected between input terminals ① and ②, and a voltage u2 is connected between input terminals ② and ③. The control device causes the gear drive device 8 to drive the rotary disk 3 to rotate the sliding mechanism to different positions of the static contact 2. Seven voltage states u, i.e., seven gears, can be output between output terminals ① and ②, including:

[0164] (1) When the inner rotary disk drives the inner sliding mechanism to rotate to the static contact 2 (hereinafter referred to as electrode ①) with code ①, and the outer rotary disk drives the outer sliding mechanism to rotate to the static contact 2 (hereinafter referred to as electrode ②) with code ②, the output voltage between output terminal ① and output terminal ② is u1, which is voltage gear 1;

[0165] It should be noted that the implementation principle of switching between any voltage adjustment gears in one step is explained by taking the sliding of the outer sliding mechanism of this gear as an example:

[0166] like Figure 8 As shown, before the gear is switched, when the outer sliding mechanism is located at electrode ①, the outer rotary disk drives the outer sliding mechanism to rotate clockwise by a step of the width of the static contact to electrode ②, realizing one-step switching to the position; before the gear is switched, when the outer sliding mechanism is located at electrode ③, the outer rotary disk drives the outer sliding mechanism to rotate counterclockwise by a step of the width of the static contact to electrode ②, realizing one-step switching to the position;

[0167] The same principle is used to control the sliding of the inner sliding mechanism, thereby realizing any combination of inner and outer static contacts and switching between any voltage adjustment gears in one step;

[0168] (2) When the inner turntable drives the inner sliding mechanism to rotate to electrode ②, and the outer turntable drives the outer sliding mechanism to rotate to electrode ①, the output voltage between output terminal ① and output terminal ② is -u1, which is voltage gear -1;

[0169] (3) When the inner rotary disk drives the inner sliding mechanism to rotate to electrode ②, and the outer rotary disk drives the outer sliding mechanism to rotate to the static contact 2 (hereinafter referred to as electrode ③) coded as ③, the output voltage between output terminal ① and output terminal ② is u2, which is voltage gear 2;

[0170] (4) When the inner turntable drives the inner sliding mechanism to rotate to electrode ③, and the outer turntable drives the outer sliding mechanism to rotate to electrode ②, the output voltage between output terminal ① and output terminal ② is -u2, which is voltage gear -2;

[0171] (5) When the inner turntable drives the inner sliding mechanism to rotate to electrode ①, and the outer turntable drives the outer sliding mechanism to rotate to electrode ③, the output voltage between output terminal ① and output terminal ② is u1+u2, which is voltage level 3;

[0172] (6) When the inner turntable drives the inner sliding mechanism to rotate to electrode ③, and the outer turntable drives the outer sliding mechanism to rotate to electrode ①, the output voltage between output terminal ① and output terminal ② is -(u1+u2), which is the voltage gear -3;

[0173] (7) When the inner sliding mechanism and the outer sliding mechanism rotate to the static contact with the same code, including when the inner turntable drives the inner sliding mechanism to rotate to electrode ①, and the outer turntable drives the outer sliding mechanism to rotate to electrode ①; when the inner turntable drives the inner sliding mechanism to rotate to electrode ②, and the outer turntable drives the outer sliding mechanism to rotate to electrode ②; when the inner turntable drives the inner sliding mechanism to rotate to electrode ③, and the outer turntable drives the outer sliding mechanism to rotate to electrode ③; the output voltage between output terminal ① and output terminal ② is 0, that is, voltage gear 0.

[0174] The above voltage level adjustment rules are summarized in Table 2. When adjusting to a certain target level, refer to Table 2 for the corresponding relationship between voltage levels and static contacts.

[0175] Table 2 Correspondence between voltage levels and static contacts

[0176]

[0177] The winding turns ratio between input terminals ①② and input terminals ②③ of the on-load tap-changer is 1:2, 1:1.5, etc. When the turns ratio or voltage ratio is 1:1.5, the on-load tap-changer can achieve non-uniform variable step voltage regulation, that is, the step size changes at non-fixed intervals, which is suitable for different scenarios.

[0178] It should be noted that the two moving contact mechanisms 1 are controlled by the control device to switch independently between the static contacts 2 of the static contact unit without interruption of power supply. Therefore, when the number of static contact units is multiple, the two moving contact mechanisms 1 can slide and switch across the static contact units, thereby realizing one-step switching between any voltage adjustment gears.

[0179] When the two moving contact mechanisms 1 are controlled by the control device to independently switch between the static contacts 2 of the static contact unit without power failure, the process in which the sliding mechanism of the moving contact mechanism 1 switches from the current static contact 2 to the adjacent static contact 2 without power failure includes:

[0180] When the direction of rotation is the direction in which the transition current limiter 4 points to the metal pole 6 (for example, Figure 8(clockwise in the figure), driven by the turntable 3, the metal pole 6 first moves from the current static contact 2 to the adjacent static contact 2, and the transition current limiter 4 and the adaptive nonlinear voltage limiter 5 move synchronously with the metal pole 6. When the metal pole 6 is separated from the current static contact 2 and has not reached the adjacent static contact 2, the current maintains power supply continuity through the transition current limiter 4, so that the current is not interrupted when the metal pole 6 is separated from the current static contact 2; the adaptive nonlinear voltage limiter 5 prevents abnormal resistance disconnection from causing overvoltage breakdown in the circuit and damaging the switch during the switching process;

[0181] When the direction of rotation is that the metal pole 6 points to the direction of the transition current limiter 4 (for example, Figure 8 (in the center, it is counterclockwise). Driven by the turntable 3, the transition current limiter 4 first moves from the current static contact 2 to the adjacent static contact 2. The adaptive nonlinear voltage limiter 5 and the metal pole 6 move synchronously with the transition current limiter 4. The transition current limiter 4 first contacts the adjacent static contact 2 to establish a path in advance, so that the current is not interrupted when the metal pole 6 separates from the current static contact 2. During the switching process, the adaptive nonlinear voltage limiter 5 prevents abnormal resistance disconnection from causing overvoltage breakdown in the circuit and damaging the switch.

[0182] Specifically, in order to achieve gear shifting, the clockwise sliding of the outer sliding mechanism is taken as an example to illustrate the switching process without power failure:

[0183] like Figure 11 As shown in the figure, the sliding switching steps are a1→b1→c1→d1→e1, where step a1 is the initial position, located at the position of electrode ②;

[0184] Turn right to the position shown in step b1. The metal electrode P2 is located between electrodes ② and ③. At this point, the current flows through the transition impedance Z2, ensuring continuous power supply during the switching process. The adaptive nonlinear voltage limiter BV2 prevents abnormal resistor disconnection, which could cause overvoltage breakdown in the circuit and damage the switch.

[0185] Continue rightward to the position shown in step c1. The metal pole P2 is located at the position of electrode ③. At this time, the transition impedance Z2 limits the short-circuit current between electrodes ② and ③, and the output power is supplied by electrode ③.

[0186] Continue rightward to the position shown in step d1. The metal pole P2 is located at the position of electrode ③. At this time, the transition impedance Z2 is located between electrodes ② and ③. The short-circuit current disappears, and the output power supply is supplied by electrode ③.

[0187] Continue to turn right to the position shown in step e1. The transition impedance Z2, metal electrode P2, and adaptive nonlinear voltage limiter BV2 are all located at the position of electrode ③. This completes the position switch from electrode ② to electrode ③.

[0188] The process of rotating to the left, i.e., counterclockwise, and the switching process of the inner sliding mechanism are similar to the above process.

[0189] The switch includes an inner driver and an outer driver. The inner driver is used to drive the inner turntable to rotate, and the outer driver is used to drive the outer turntable to rotate. It has the functions of rotation angle positioning, forward / reverse rotation, and rotation position feedback.

[0190] The switch includes a control system for issuing control instructions to the inner / outer drivers, controlling the rotation angle and direction of each driver, receiving various status feedback information, and realizing protection alarm functions.

[0191] Special note: Driven by the turntable, the sliding mechanism can rotate (forward or reverse) to any position of electrode ①, electrode ②, and electrode ③ at one time.

[0192] Example 3:

[0193] Based on the same inventive concept, the present invention also provides an amplitude-phase decoupling regulation transformer control system, such as Figure 12 As shown, including:

[0194] An instruction calculation module is used to determine a voltage regulation instruction value after amplitude-phase decoupling regulation based on the real-time power value and power instruction value of the three-phase parallel transformer and a preset direction function;

[0195] a data processing module, configured to obtain a controllable voltage vector by subtracting the voltage regulation command value from the system real-time voltage vector;

[0196] an instruction determination module, configured to map the controllable voltage vector into a voltage vector space, and to use as a voltage regulation instruction point the voltage-adjustable vector point in the voltage vector space that is the smallest distance from the endpoint of the controllable voltage vector; wherein the voltage-adjustable vector point is formed by superimposing the output voltages of the on-load tap-regulating switches of the secondary winding of the current phase, the secondary winding of the lagging phase, and the secondary winding of the leading phase, which are sequentially connected in series at the input end of each phase of the three-phase shunt transformer, after voltage level adjustment;

[0197] A control module is used to determine the voltage levels of the on-load tap-regulating switch of the secondary winding of the current phase, the on-load tap-regulating switch of the secondary winding of the lagging phase, and the on-load tap-regulating switch of the secondary winding of the leading phase corresponding to the voltage regulation command point based on the voltage regulation command point, and control the three-phase parallel transformer according to the voltage levels.

[0198] In this embodiment, the instruction calculation module includes:

[0199] A first calculation unit is used to calculate a power deviation based on a real-time power value and a power command value of the three-phase parallel transformer;

[0200] a second calculation unit, configured to, when the power deviation is greater than a set deviation threshold, substitute the real-time power value and the power command value into a preset direction function to calculate a power direction change coefficient;

[0201] a third calculation unit, configured to determine an adjustment amount of a voltage amplitude or a voltage phase of the three-phase parallel transformer based on the power direction variation coefficient and the power deviation;

[0202] The fourth calculation unit is used to add the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase to the real-time voltage vector of the system to obtain the voltage adjustment instruction value after amplitude-phase decoupling adjustment.

[0203] In this embodiment, the power direction change coefficient is expressed as:

[0204] ;

[0205] in, detection represents the power direction change coefficient, represent the active power and reactive power of the power command value respectively, 、 Respectively represent the active power and reactive power of the real-time power value; α represents the rate of change of active power relative to voltage amplitude, β represents the rate of change of active power relative to voltage phase, γ represents the rate of change of reactive power relative to voltage amplitude, and σ represents the rate of change of reactive power relative to voltage phase; represents the weight coefficient of α, represents the weight coefficient of β, represents the weight coefficient of γ, represents the weight coefficient of σ.

[0206] In this embodiment, the third calculation unit includes:

[0207] an adjustment direction determining subunit, configured to determine an adjustment direction of a voltage amplitude or a voltage phase of the three-phase parallel transformer based on a relationship between the power direction variation coefficient and a set coefficient threshold;

[0208] an adjustment step determining subunit, configured to determine an adjustment step of a voltage amplitude or a voltage phase of the three-phase parallel transformer based on a deviation level of the power deviation;

[0209] The adjustment amount determination subunit is used to combine the adjustment direction and adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer to obtain the adjustment amount of the voltage amplitude or voltage phase of the three-phase parallel transformer.

[0210] In this embodiment, the adjustment direction determination subunit is specifically used to:

[0211] Based on the relationship between the power direction change coefficient and the set coefficient threshold, when the power direction change coefficient is greater than 1, the voltage amplitude of the three-phase parallel transformer is negatively adjusted; when the power direction change coefficient is less than -1, the voltage amplitude is positively adjusted; when the power direction change coefficient is between 0 and 1, the voltage phase of the three-phase parallel transformer is negatively adjusted; when the power direction change coefficient is between -1 and 0, the voltage phase is positively adjusted.

[0212] In this embodiment, the adjustment step size determination subunit is used to:

[0213] Based on the deviation level of the power deviation, when the power deviation is a level one deviation, setting the adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer to one unit step of the voltage amplitude or the voltage phase;

[0214] When the power deviation is a secondary deviation, the adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer is set to twice the unit step of the voltage amplitude or the voltage phase;

[0215] When the power deviation is a third-level deviation, the adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer is set to three times the unit step of the voltage amplitude or the voltage phase;

[0216] The deviation ranges of the first-level deviation, the second-level deviation and the third-level deviation increase in sequence.

[0217] In this embodiment, the on-load tap-changing switches of the secondary windings of the three-phase parallel transformers are driven synchronously, the on-load tap-changing switches of the lagging secondary windings of the three-phase parallel transformers are driven synchronously, and the on-load tap-changing switches of the leading secondary windings of the three-phase parallel transformers are driven synchronously.

[0218] Example 4

[0219] like Figure 13 As shown, the present invention also provides an electronic device, which may be a computer, a single-chip microcomputer, a smart mobile device, or the like. The electronic device in this embodiment may include a processor, a memory, a transceiver component, and the like. The memory, processor, and transceiver component are connected via a bus; the memory may be used to store an execution program, which may include instructions; and the processor may be used to execute the instructions stored in the memory. The memory may also be used to store data, which may be accessed and / or modified during the execution of the instructions.

[0220] The processor may be a central processing unit (CPU), or it may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of an amplitude-phase decoupling regulation transformer control method in the above embodiment.

[0221] Example 5

[0222] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device-readable storage medium (Memory). The electronic device-readable storage medium is a memory device within the electronic device, used to store programs and data. It is understood that the storage medium herein may include both built-in storage media within the electronic device and, of course, extended storage media supported by the electronic device. The storage medium provides storage space, which stores the terminal's operating system. Furthermore, the storage space also stores one or more instructions suitable for being loaded and executed by a processor. These instructions may be one or more executable programs (including program code). It should be noted that the storage medium herein may be high-speed RAM memory or non-volatile memory, such as at least one disk drive. The processor loading and executing the one or more instructions stored in the storage medium implements the steps of the amplitude-phase decoupling regulation transformer control method described in the above-mentioned embodiment.

[0223] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0224] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts 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, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0225] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0226] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0227] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art may still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the scope of protection of the claims of the present invention.

Claims

1. A method for controlling a transformer with amplitude-phase decoupling regulation, characterized in that: include: Based on the real-time power value and power command value of the three-phase parallel transformer, a preset direction function is used to determine the voltage regulation command value after amplitude-phase decoupling regulation; Subtracting the voltage regulation command value from the system real-time voltage vector to obtain a controllable voltage vector; Mapping the controllable voltage vector into a voltage vector space, and using the voltage-adjustable vector point in the voltage vector space that is the smallest distance from the endpoint of the controllable voltage vector as a voltage regulation command point; wherein the voltage-adjustable vector point is formed by superimposing the output voltages after voltage level adjustment by an on-load tap-regulating switch of a secondary winding of the current phase, an on-load tap-regulating switch of a secondary winding of a lagging phase, and an on-load tap-regulating switch of a secondary winding of a leading phase, which are sequentially connected in series at the input end of each phase of the three-phase shunt transformer; Based on the voltage regulation command point, the voltage levels of the on-load tap-regulating switch of the secondary winding of the current phase, the on-load tap-regulating switch of the secondary winding of the lagging phase and the on-load tap-regulating switch of the secondary winding of the leading phase corresponding to the voltage regulation command point are determined, and the three-phase parallel transformer is controlled according to the voltage levels.

2. The method according to claim 1, wherein The method of determining the voltage regulation command value after amplitude-phase decoupling regulation based on the real-time power value and the power command value of the three-phase parallel transformer and using a preset direction function includes: Calculate the power deviation based on the real-time power value and power command value of the three-phase parallel transformer; When the power deviation is greater than a set deviation threshold, substituting the real-time power value and the power command value into a preset direction function to calculate a power direction change coefficient; determining an adjustment amount of a voltage amplitude or a voltage phase of the three-phase parallel transformer based on the power direction variation coefficient and the power deviation; The voltage amplitude adjustment amount or the voltage phase adjustment amount is superimposed on the system real-time voltage vector to obtain a voltage adjustment command value after amplitude-phase decoupling adjustment.

3. The method according to claim 2, wherein The power direction variation coefficient is expressed as: ； in, detection represents the power direction change coefficient, represent the active power and reactive power of the power command value respectively, 、 Respectively represent the active power and reactive power of the real-time power value; α represents the rate of change of active power relative to voltage amplitude, β represents the rate of change of active power relative to voltage phase, γ represents the rate of change of reactive power relative to voltage amplitude, and σ represents the rate of change of reactive power relative to voltage phase; represents the weight coefficient of α, represents the weight coefficient of β, represents the weight coefficient of γ, represents the weight coefficient of σ.

4. The method according to claim 2 or 3, wherein: The determining, based on the power direction variation coefficient and the power deviation, an adjustment amount of the voltage amplitude or an adjustment amount of the voltage phase of the three-phase parallel transformer includes: determining an adjustment direction of a voltage amplitude or a voltage phase of the three-phase parallel transformer based on a relationship between the power direction variation coefficient and a set coefficient threshold; determining an adjustment step of a voltage amplitude or a voltage phase of the three-phase parallel transformer based on a deviation level of the power deviation; The adjustment direction and adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer are combined to obtain the adjustment amount of the voltage amplitude or voltage phase of the three-phase parallel transformer.

5. The method according to claim 4, wherein The determining, based on the relationship between the power direction variation coefficient and the set coefficient threshold, of the voltage amplitude adjustment direction or the voltage phase adjustment direction of the three-phase parallel transformer includes: Based on the relationship between the power direction change coefficient and the set coefficient threshold, when the power direction change coefficient is greater than 1, the voltage amplitude of the three-phase parallel transformer is negatively adjusted; when the power direction change coefficient is less than -1, the voltage amplitude is positively adjusted; when the power direction change coefficient is between 0 and 1, the voltage phase of the three-phase parallel transformer is negatively adjusted; when the power direction change coefficient is between -1 and 0, the voltage phase is positively adjusted.

6. The method according to claim 4, wherein The determining, based on the deviation level of the power deviation, of the voltage amplitude or voltage phase adjustment step of the three-phase parallel transformer includes: Based on the deviation level of the power deviation, when the power deviation is a level one deviation, setting the adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer to one unit step of the voltage amplitude or the voltage phase; When the power deviation is a secondary deviation, the adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer is set to twice the unit step of the voltage amplitude or the voltage phase; When the power deviation is a level three deviation, the adjustment step of the voltage amplitude or voltage phase of the three-phase parallel transformer is set to three times the unit step of the voltage amplitude or the voltage phase; The deviation ranges of the first-level deviation, the second-level deviation and the third-level deviation increase in sequence.

7. The method according to any one of claims 1 to 3, wherein: The on-load tap-changing switches of the secondary windings of the three-phase parallel transformers are driven synchronously, the on-load tap-changing switches of the lagging secondary windings of the three-phase parallel transformers are driven synchronously, and the on-load tap-changing switches of the leading secondary windings of the three-phase parallel transformers are driven synchronously.

8. An amplitude-phase decoupling regulating transformer, characterized in that: include: A three-phase parallel transformer and an on-load tap-changing switch of a secondary winding of the current phase, an on-load tap-changing switch of a secondary winding of a lagging phase and an on-load tap-changing switch of a secondary winding of a leading phase connected in series in sequence at the input end of each phase of the three-phase parallel transformer; Each of the on-load tap-changing switches realizes cross-voltage gear adjustment through two gear drive devices; The on-load tap-changing switches of the secondary windings of the three-phase parallel transformers are synchronously driven, the on-load tap-changing switches of the secondary windings of the lagging phases of the three-phase parallel transformers are synchronously driven, and the on-load tap-changing switches of the secondary windings of the leading phases of the three-phase parallel transformers are synchronously driven; The amplitude-phase decoupling regulating transformer is used to implement the method of claim 1 above.

9. The amplitude-phase decoupling regulating transformer according to claim 8, characterized in that: The on-load tap-changing switch comprises at least one static contact unit and two movable contact mechanisms (1) that slide independently on the static contact unit, the two movable contact mechanisms (1) being correspondingly connected to the two gear drive devices; The static contact unit comprises three static contacts (2), the three static contacts (2) being correspondingly connected to a plurality of asymmetric taps of the secondary winding of the three-phase parallel transformer, all the static contacts (2) being arranged in a ring array, with a spacing between two adjacent static contacts; Each of the movable contact mechanisms (1) realizes uninterrupted conductive connection switching with each of the static contacts (2) during the sliding process; the movable contact mechanism (1) is connected to the output end of the on-load tap-changing switch.

10. The amplitude-phase decoupling regulating transformer according to claim 9, characterized in that: Each of the static contacts (2) has two conductive surfaces, and the two conductive surfaces of all the static contacts (2) respectively form two circumferential surfaces, and the two moving contact mechanisms (1) respectively slide independently along the two circumferential surfaces.

11. The amplitude-phase decoupling regulating transformer according to claim 10, characterized in that: Each of the moving contact mechanisms (1) comprises a rotating disk (3) arranged coaxially with the circumferential surface, a transition current limiter (4) conductively connected and fixed to the rotating disk (3), an adaptive nonlinear voltage limiter (5), and a metal pole (6); The transition current limiter (4), the adaptive nonlinear voltage limiter (5) and one end of the metal pole (6) are arranged in sequence along the circumferential direction of the turntable (3), and the other ends of the transition current limiter (4), the adaptive nonlinear voltage limiter (5) and the metal pole (6) are in sliding contact with the conductive surface; the spacing between the transition current limiter (4) and the metal pole (6) is smaller than the width of the conductive surface and larger than the set electrical insulation clearance; the turntable (3) is connected to the output end of the on-load tap changer.

12. The amplitude-phase decoupling regulating transformer according to claim 11, characterized in that: When the voltage between the adaptive nonlinear voltage limiter (5) and the static contact (2) in contact therewith is greater than or equal to a set voltage protection value, the impedance of the adaptive nonlinear voltage limiter (5) is less than a set impedance lower limit value; When the voltage between the adaptive nonlinear voltage limiter (5) and the static contact (2) in contact with it is less than the voltage protection value, the impedance of the adaptive nonlinear voltage limiter (5) is greater than a set impedance upper limit value.

13. The amplitude-phase decoupling regulating transformer according to any one of claims 9 to 12, characterized in that: When the number of the static contact units is two or more, the three static contacts (2) in each static contact unit are coded in ascending order, and the static contact units are coded cyclically. The static contacts (2) with the same coding in each static contact unit are connected through an interconnecting bus (9). After being connected, the static contacts (2) with the same coding are correspondingly connected to the three input terminals of the on-load tap-changer, and the three input terminals are correspondingly connected to the multiple asymmetric taps of the secondary winding of the three-phase parallel transformer.

14. An amplitude-phase decoupling regulation transformer control system, characterized in that: include: An instruction calculation module is used to determine a voltage regulation instruction value after amplitude-phase decoupling regulation based on the real-time power value and power instruction value of the three-phase parallel transformer and a preset direction function; a data processing module, configured to obtain a controllable voltage vector by subtracting the voltage regulation command value from the system real-time voltage vector; an instruction determination module, configured to map the controllable voltage vector into a voltage vector space, and to use as a voltage regulation instruction point the voltage-adjustable vector point in the voltage vector space that is the smallest distance from the endpoint of the controllable voltage vector; wherein the voltage-adjustable vector point is formed by superimposing the output voltages of the on-load tap-regulating switches of the secondary winding of the current phase, the secondary winding of the lagging phase, and the secondary winding of the leading phase, which are sequentially connected in series at the input end of each phase of the three-phase shunt transformer, after voltage level adjustment; A control module is used to determine the voltage levels of the on-load tap-regulating switch of the secondary winding of the current phase, the on-load tap-regulating switch of the secondary winding of the lagging phase, and the on-load tap-regulating switch of the secondary winding of the leading phase corresponding to the voltage regulation command point based on the voltage regulation command point, and control the three-phase parallel transformer according to the voltage levels.

15. An electronic device, characterized in that: include: at least one processor and memory; 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 amplitude-phase decoupling regulation transformer control method according to any one of claims 1 to 7 is implemented.

16. A readable storage medium, characterized in that An execution program is stored thereon, and when the execution program is executed, the amplitude-phase decoupling regulation transformer control method according to any one of claims 1 to 7 is implemented.

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