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

Abstract

The invention provides an amplitude-phase decoupling regulation transformer control method, a transformer, a system and equipment. The amplitude-phase decoupling regulation transformer control method comprises the following steps: determining a voltage regulation instruction value and a controllable voltage vector after amplitude-phase decoupling regulation by adopting a direction function; searching a voltage regulation instruction point from a plurality of voltage adjustable vector points in the voltage vector space; the voltage adjustable vector point is formed by combining and superposing gears of three groups of on-load tap changer; determining a voltage gear of each switch corresponding to the voltage regulation instruction point to perform three-phase parallel transformer control; according to the invention, a plurality of voltage adjustable vector points are obtained through arbitrary combination and superposition of voltage gears of the three groups of on-load voltage regulation switches, and voltage amplitude-phase decoupling regulation can be realized when voltage regulation instruction points are selected from the plurality of voltage adjustable vector points; meanwhile, the real-time power value is corrected through a direction function, a voltage regulation instruction is obtained, and directional accurate and rapid optimization is achieved; and meanwhile, the on-load tap changer can realize cross-voltage tap position regulation only through two tap position driving devices, so that excessive control quantity is avoided.

Description

Technical Field

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

[0002] In the context of the continuous promotion of the construction of a new power system, the power grid, especially the distribution network, is gradually evolving from a traditional simple power distribution network to a new form of integrated interaction of source-network-load-storage and flexible coupling with the superior power grid, and its role in promoting the nearby consumption of distributed power sources and carrying new loads is becoming increasingly prominent. The operating characteristics of the distribution network are becoming increasingly complex, and the requirements for its flexible voltage regulation, phase regulation, impedance regulation and power flow regulation capabilities are also getting higher and higher.

[0003] In the face of the above actual needs, the existing transformer voltage regulation technology can adjust the voltage without power interruption by means of multiple taps of the winding combined with on-load tap changers, series-parallel power electronic converters, etc. However, many drawbacks have emerged in the integration and control of traditional regulating devices. For example, ① traditional phase shifters usually have amplitude-phase coupling phenomena, making it difficult to independently control the voltage amplitude and phase angle, and unable to meet the requirements of the power grid for flexible regulation of many physical quantities; ② the control process has problems such as long calculation time, unstable action process, many adjustment steps, and large target vector deviation, resulting in difficulties in accurately regulating the voltage amplitude / phase, etc. Therefore, it is urgent to solve the above problems to provide strong support for the stable and efficient operation of the new power system. Summary of the Invention

[0004] To overcome the deficiencies of low flexibility and low accuracy in transformer control in the above-mentioned prior art, the present invention proposes a control method for an amplitude-phase decoupling regulation transformer, including: Based on the real-time power value and the power command value of a three-phase shunt transformer, using a preset direction function, determine the voltage regulation command value after amplitude-phase decoupling regulation; Subtract the voltage regulation command value from the real-time voltage vector of the system to obtain a controllable voltage vector; Map the controllable voltage vector into the voltage vector space, and take the voltage adjustable vector point with the smallest distance from the end point of the controllable voltage vector in the voltage vector space as the voltage regulation command point; wherein, the voltage adjustable vector point is formed by superimposing the output voltages after voltage grade adjustment by the on-load tap changer of the secondary winding of this phase, the on-load tap changer of the lagging-phase secondary winding, and the on-load tap changer of the leading-phase secondary winding connected in series at the input end of each phase of the three-phase shunt transformer; Based on the voltage regulation command point, determine the voltage levels of the on-load tap-changer of the primary side winding of this phase, the on-load tap-changer of the lagging phase secondary side winding, and the on-load tap-changer of the leading phase secondary side winding corresponding to the voltage regulation command point, and perform the control of the three-phase shunt transformer according to the voltage levels.

[0005] Preferably, the method for determining the voltage regulation command value after amplitude-phase decoupling regulation by using a preset direction function based on the real-time power value and the power command value of the three-phase shunt transformer includes: Calculate the power deviation based on the real-time power value and the power command value of the three-phase shunt transformer; When the power deviation is greater than the set deviation threshold, substitute the real-time power value and the power command value into the preset direction function to calculate the power direction change coefficient; Determine the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase of the three-phase shunt transformer based on the power direction change coefficient and the power deviation; Superimpose the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase on the system real-time voltage vector to obtain the voltage regulation command value after amplitude-phase decoupling regulation.

[0006] Preferably, the power direction change coefficient is expressed as: ; Wherein, detection represents the power direction change coefficient, respectively represent the active power and reactive power of the power command value, , respectively represent the active power and reactive power of the real-time power value; α represents the change rate of active power relative to the voltage amplitude, β represents the change rate of active power relative to the voltage phase, γ represents the change rate of reactive power relative to the voltage amplitude, and σ represents the change rate of reactive power relative to the 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.

[0007] Preferably, the method for determining the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase of the three-phase shunt transformer based on the power direction change coefficient and the power deviation includes: Determine the adjustment direction of the voltage amplitude or the adjustment direction of the voltage phase of the three-phase shunt transformer based on the relationship between the power direction change coefficient and the set coefficient threshold; Determine the adjustment step of the voltage amplitude or the adjustment step of the voltage phase of the three-phase shunt transformer based on the deviation level of the power deviation; Combine the adjustment direction and adjustment step of the voltage amplitude or voltage phase of the three-phase shunt transformer to obtain the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase of the three-phase shunt transformer.

[0008] Preferably, determining the adjustment direction of the voltage amplitude or the adjustment direction of the voltage phase of the three-phase shunt transformer based on the relationship between the power direction change coefficient and the set coefficient threshold 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, negatively adjust the voltage amplitude of the three-phase shunt transformer; when the power direction change coefficient is less than -1, positively adjust the voltage amplitude; when the power direction change coefficient is between 0 and 1, negatively adjust the voltage phase of the three-phase shunt transformer; when the power direction change coefficient is between -1 and 0, positively adjust the voltage phase.

[0009] Preferably, determining the adjustment step of the voltage amplitude or the adjustment step of the voltage phase of the three-phase shunt transformer based on the deviation level of the power deviation includes: Based on the deviation level of the power deviation, when the power deviation is a first-level deviation, set the adjustment step of the voltage amplitude or the voltage phase of the three-phase shunt transformer to one unit step of the voltage amplitude or the voltage phase; When the power deviation is a second-level deviation, set the adjustment step of the voltage amplitude or the voltage phase of the three-phase shunt transformer to two unit steps of the voltage amplitude or the voltage phase; When the power deviation is a third-level deviation, set the adjustment step of the voltage amplitude or the voltage phase of the three-phase shunt transformer to three unit steps 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.

[0010] Preferably, the on-load tap-changer of the primary side winding of each phase of the three-phase shunt transformer is synchronously driven, the on-load tap-changer of the lagging-phase secondary side winding of each phase is synchronously driven, and the on-load tap-changer of the leading-phase secondary side winding of each phase is synchronously driven.

[0011] Based on the same inventive concept, the present invention also provides a magnitude-phase decoupling adjustment transformer, including: a three-phase shunt transformer and on-load tap-changers of the primary side winding of each phase, on-load tap-changers of the lagging-phase secondary side winding, and on-load tap-changers of the leading-phase secondary side winding that are connected in series in sequence at the input end of each phase of the three-phase shunt transformer; Each of the on-load tap-changers realizes cross-voltage gear adjustment through two gear driving devices; The on-load tap-changers of the secondary windings of each phase of the three-phase shunt transformer are synchronously driven, the on-load tap-changers of the lagging-phase secondary windings of each phase are synchronously driven, and the on-load tap-changers of the leading-phase secondary windings of each phase are synchronously driven; The amplitude-phase decoupling regulating transformer is used to implement the above amplitude-phase decoupling regulating transformer control method.

[0012] Preferably, the on-load tap-changer includes at least one static contact unit and two moving contact mechanisms that slide independently on the static contact unit, and the two moving contact mechanisms are correspondingly connected to the two gear driving devices; The static contact unit includes three static contacts, and the three static contacts are correspondingly connected to multiple asymmetric taps of the secondary winding of the three-phase shunt transformer. All the static contacts are arranged in a circular array, and there is a spacing between two adjacent static contacts; During the sliding process of each moving contact mechanism, a continuously powered conductive connection switching is achieved between each moving contact mechanism and each static contact; the moving contact mechanism is connected to the output end of the on-load tap-changer.

[0013] Preferably, each static contact 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.

[0014] Preferably, each moving contact mechanism includes a turntable arranged coaxially with the circumferential surface, a transition current limiter, an adaptive non-linear voltage limiter and a metal pole rod that are conductively connected and fixed on the turntable; One ends of the transition current limiter, the adaptive non-linear voltage limiter and the metal pole rod are arranged in sequence along the circumferential direction of the turntable, and the other ends of the transition current limiter, the adaptive non-linear voltage limiter and the metal pole rod are in sliding contact with the conductive surface; the spacing between the transition current limiter and the metal pole rod is less 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.

[0015] Preferably, when the voltage between the adaptive non-linear voltage limiter and the static contact it contacts is greater than or equal to the set voltage protection value, the impedance of the adaptive non-linear voltage limiter is less than the set impedance lower limit value; When the voltage between the adaptive non-linear voltage limiter and the static contact it contacts is less than the voltage protection value, the impedance of the adaptive non-linear voltage limiter is greater than the set impedance upper limit value.

[0016] 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 code in each static contact unit are connected by an interconnection busbar. After the static contacts with the same code are connected, they are correspondingly connected to the three input ends of the on-load tap-changer. The three input ends are correspondingly connected to multiple asymmetric taps of the secondary winding of the three-phase shunt transformer.

[0017] Based on the same inventive concept, the present invention further provides a phasor-amplitude decoupling regulation transformer control system, including: An instruction calculation module, configured to determine a voltage regulation instruction value after phasor-amplitude decoupling regulation based on the real-time power value and the power instruction value of the three-phase shunt transformer by using a preset direction function; A data processing module, configured to subtract the voltage regulation instruction value from the system real-time voltage vector to obtain a controllable voltage vector; An instruction determination module, configured to map the controllable voltage vector into a voltage vector space, and use the voltage adjustable vector point in the voltage vector space with the smallest distance from the end point of the controllable voltage vector as the voltage regulation instruction point; wherein, the voltage adjustable vector point is formed by superimposing the output voltages after voltage grade regulation of the on-load tap-changer of the secondary winding of the present phase, the on-load tap-changer of the secondary winding of the lagging phase, and the on-load tap-changer of the secondary winding of the leading phase, which are connected in series in turn at each phase input end of the three-phase shunt transformer; A control module, configured to determine the voltage grades of the on-load tap-changer of the secondary winding of the present phase, the on-load tap-changer of the secondary winding of the lagging phase, and the on-load tap-changer of the secondary winding of the leading phase corresponding to the voltage regulation instruction point based on the voltage regulation instruction point, and perform control on the three-phase shunt transformer according to the voltage grades.

[0018] Based on the same inventive concept, the present invention further provides a computer device, including: one or more processors; A memory, configured to store one or more programs; When the one or more programs are executed by the one or more processors, the method for controlling a phasor-amplitude decoupling regulation transformer as described above is implemented.

[0019] Based on the same inventive concept, the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed, the method for controlling a phasor-amplitude decoupling regulation transformer as described above is implemented.

[0020] Compared with the closest prior art, the beneficial effects of the present invention are as follows: The present invention provides a control method and system for amplitude-phase decoupling regulation of a transformer, including determining a voltage regulation command value after amplitude-phase decoupling regulation by using a preset direction function based on the real-time power value and the power command value of a three-phase shunt transformer; 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 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 the voltage regulation command point; wherein, the voltage adjustable vector point is formed by superimposing the output voltages after voltage grade regulation of the on-load tap-changer of the primary side winding of this phase, the on-load tap-changer of the lagging-phase secondary side winding, and the on-load tap-changer of the leading-phase secondary side winding, which are successively connected in series at the input end of each phase of the three-phase shunt transformer; based on the voltage regulation command point, determining the voltage grades of the on-load tap-changer of the primary side winding of this phase, the on-load tap-changer of the lagging-phase secondary side winding, and the on-load tap-changer of the leading-phase secondary side winding corresponding to the voltage regulation command point, and controlling the three-phase shunt transformer according to the voltage grades; through the arbitrary combination and superposition of the voltage grades of the three groups of on-load tap-changers, the method and system can obtain multiple voltage adjustable vector points, and can realize amplitude-phase decoupling regulation of voltage when selecting the voltage regulation command point from multiple voltage adjustable vector points; at the same time, by correcting the real-time power value through the direction function to obtain a voltage regulation command, it can realize directional precise and fast optimization, the control process is simple, and the power flow power distribution regulation can be quickly and accurately completed without obtaining detailed impedance and load parameters of the system power grid line, avoiding process control problems such as long calculation time, unstable action process, many adjustment steps, and large target vector deviation in the control process.

[0021] The present invention also provides a magnitude-phase decoupling regulating transformer, which includes a three-phase parallel transformer and a phase-side secondary winding on-load tap changer, a lag-phase secondary winding on-load tap changer, and a leading-phase secondary winding on-load tap changer connected in series in sequence at each phase input end of the three-phase parallel transformer; each of the on-load tap changers realizes cross-voltage gear regulation through two gear driving devices; the phase-side secondary winding on-load tap changers of each phase of the three-phase parallel transformer are driven synchronously, the lag-phase secondary winding on-load tap changers of each phase are driven synchronously, and the leading-phase secondary winding on-load tap changers of each phase are driven synchronously; this transformer combines three groups of on-load tap changers with the three-phase parallel transformer, and externally appears as a special transformer, and the three groups of on-load tap changers do not increase additional losses, and at the same time, it avoids separately designing an adjustment switch system outside the transformer and the need for auxiliary systems such as heat dissipation that need to be synchronously designed; at the same time, the on-load tap changer can realize cross-voltage gear regulation only through two gear driving devices, and the synchronously driven on-load tap changers of each phase are automatically grouped, so that only 2 control quantities are required to control a group of switches. Therefore, only 6 driving control quantities need to be determined for the entire control process of direct voltage regulation or power flow regulation, solving the problem that traditional regulating devices require a large number of winding numbers, tap numbers, and on-load tap changers when a wide regulation range is required. The overall structure of the device is compact, economical, occupies a small area, has high reliability, and low losses, and has important popularization value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic flow chart of a control method for a magnitude-phase decoupling regulating transformer provided by the present invention; Figure 2 is a schematic distribution diagram of voltage-adjustable vector points in the voltage vector space provided by the present invention; Figure 3 is a schematic structural diagram of a magnitude-phase decoupling regulating transformer provided by the present invention; Figure 4 is a schematic overall control flow chart of a control method for a magnitude-phase decoupling regulating transformer provided by the present invention; Figure 5 is a schematic control flow chart of the directional optimization method provided by the present invention; Figure 6 is a schematic vector relationship diagram between the output voltage of the regulating transformer and the system voltage provided by the present invention; Figure 7 is a schematic comparison diagram between the method of the present invention and the traditional method; Figure 8 is a schematic structural diagram of the on-load tap changer provided by the present invention; Figure 9 is Figure 8Schematic diagram of the positional relationship among the transition current limiter Z1, transition current limiter Z2, adaptive non-linear voltage limiter BV1, adaptive non-linear voltage limiter BV2, metal pole rod P1 and metal pole rod P2; Figure 10 Schematic diagram of the input and output states of a magnitude-phase decoupling regulating transformer provided by the present invention; Figure 11 Partial schematic diagram of the sliding switching process of the moving contact mechanism provided by the present invention; Figure 12 Schematic diagram of the control system structure of a magnitude-phase decoupling regulating transformer provided by the present invention; Figure 13 Schematic diagram of the structure of an electronic device provided by the present invention; Wherein, 1. moving contact mechanism; 2. static contact; 3. turntable; 4. transition current limiter; 5. adaptive non-linear voltage limiter; 6. metal pole rod; 7. controller; 8. gear driving device; 9. interconnected busbar. Detailed implementation manners

[0023] The following further elaborates on the detailed implementation manners of the present invention with reference to the accompanying drawings.

[0024] Embodiment 1: Based on the same inventive concept, the present invention also provides a control method for a magnitude-phase decoupling regulating transformer, as Figure 1 shown, including: S1. Based on the real-time power value and power command value of a three-phase shunt transformer, use a preset direction function to determine the voltage regulation command value after magnitude-phase decoupling regulation; S2. Subtract the voltage regulation command value from the system real-time voltage vector to obtain a controllable voltage vector; S3. Map the controllable voltage vector into the voltage vector space, and use the voltage adjustable vector point in the voltage vector space that has the smallest distance from the end point of the controllable voltage vector as the voltage regulation command point; wherein, the voltage adjustable vector point is formed by superimposing the output voltages after voltage gear regulation of the on-load tap-changer of the secondary winding of this phase, the on-load tap-changer of the secondary winding of the lagging phase, and the on-load tap-changer of the secondary winding of the leading phase connected in series at the input end of each phase of the three-phase shunt transformer; S4. Based on the voltage regulation command point, determine the voltage gears of the on-load tap-changer of the secondary winding of this phase, the on-load tap-changer of the secondary winding of the lagging phase, and the on-load tap-changer of the secondary winding of the leading phase corresponding to the voltage regulation command point, and control the three-phase shunt transformer according to the voltage gears.

[0025] Considering the deficiencies of low flexibility and low accuracy in transformer control in the prior art, the present invention enables multiple voltage-adjustable vector points to be obtained when the gear positions of the three on-load tap-changers connected in series in each phase are arbitrarily combined and superimposed through a specific connection method of the three on-load tap-changers in each phase. Thus, it provides a basis for realizing amplitude-phase decoupling regulation. Furthermore, when selecting a voltage regulation command point among multiple voltage-adjustable vector points, voltage amplitude-phase decoupling regulation can be achieved, with higher control flexibility. At the same time, by correcting the real-time power value through a direction function to obtain a voltage regulation command, it can achieve directional precise and rapid optimization. The control process is simple, and the power flow distribution regulation can be quickly and accurately completed without obtaining detailed impedance and load parameters of the system power grid lines, avoiding process control problems such as long calculation time, unstable operation process, many adjustment steps, and large target vector deviation in the control process. It can be used in application fields such as power system voltage / power flow regulation, flexible control of power grid operation mode, short-circuit current suppression, and supply voltage regulation in industrial and commercial scenarios, etc.

[0026] Exemplarily, each on-load tap-changer has seven voltage positions: 0, ±1, ±2, ±3. Each voltage position corresponds to a different output voltage. The voltage positions of the three on-load tap-changers in each phase are vectorially superimposed on each other, and 127 voltage vectors with different amplitudes and phases, that is, voltage-adjustable vector points, can be synthesized. 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, that is, in the vector diagram, is as Figure 2 shown. When the number of voltage positions of the on-load tap-changer increases, the number of voltage-adjustable vector points will also increase accordingly. As can be Figure 2 seen, both the amplitude and phase of the voltage can be independently controlled, thus amplitude-phase decoupling regulation can be realized, facilitating flexible voltage regulation and power flow control of 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.

[0027] The relationship between the vector points on the positive-sequence coordinate axis in the voltage vector space and the voltage positions is shown in Table 1. In Table 1, the vector points at other positions can be synthesized from the vectors on the coordinate axis. Among them, taking the synthesis of the compensation voltage of phase A in the three phases as an example, a represents the voltage position of the on-load tap-changer of the secondary winding of this phase, b represents the voltage position of the on-load tap-changer of the secondary winding of the lagging phase, and c represents the voltage position of the on-load tap-changer of the secondary winding of the leading phase. Taking the Figure 2 red compensation voltage vector in as an example, the corresponding positions for synthesizing this vector are (2, -1, 0).

[0028] Table 1 Relationship between vector points on the positive-sequence coordinate axis and voltage positions

[0029] It should be noted that for the A-phase compensation voltage, the A-phase is the phase voltage of this phase, the B-phase is the phase voltage with an angular difference of -120°, and the C-phase is the phase voltage with an angular difference of 120°; for the B-phase compensation voltage, the B-phase is the phase voltage of this phase, the C-phase is the phase voltage with an angular difference of -120°, and the A-phase is the phase voltage with an angular difference of 120°; for the C-phase compensation voltage, the C-phase is the phase voltage of this phase, the A-phase is the phase voltage with an angular difference of -120°, and the B-phase is the phase voltage with an angular difference of 120°; that is, when the A-phase is the phase of this phase, the B-phase is the lagging phase and the C-phase is the leading phase; when the B-phase is the phase of this phase, the C-phase is the lagging phase and the A-phase is the leading phase; when the C-phase is the phase of this phase, the A-phase is the lagging phase and the B-phase is the leading phase.

[0030] Therefore, as Figure 3 shown, each of the A, B, and C phases has its own on-load tap-changer for the phase winding of the secondary side, the on-load tap-changer for the lagging-phase winding of the secondary side, and the on-load tap-changer for the leading-phase winding of the secondary side. The entire regulating transformer has a total of 9 on-load tap-changers.

[0031] In this embodiment, the on-load tap-changers for the phase windings of the secondary side of each phase of the three-phase shunt transformer are driven synchronously, the on-load tap-changers for the lagging-phase windings of the secondary side of each phase are driven synchronously, and the on-load tap-changers for the leading-phase windings of the secondary side of each phase are driven synchronously.

[0032] It should be noted that multiple on-load tap-changers driven synchronously form a group automatically. Specifically, as Figure 3 shown, each group of switches of the compact amplitude-phase decoupling regulating transformer is a matrix-type fast on-load tap-changer, which is a three-phase integrated structure of A, B, and C, and each group of matrix-type fast on-load tap-changers can achieve three-phase synchronous step regulation. The on-load tap-changers for the phase windings of the secondary side of each phase form the first group of switches, specifically the first group of matrix-type fast on-load tap-changers. The on-load tap-changers for the lagging-phase windings of the secondary side of each phase form the second group of switches, specifically the second group of matrix-type fast on-load tap-changers. The on-load tap-changers for the leading-phase windings of the secondary side of each phase form the third group of switches, specifically the third group of matrix-type fast on-load tap-changers. In order to make each group of switches more clearly shown in the drawing, in Figure 3 each group of switches is made to form a row. At this time, the input ends of the first group of matrix-type fast on-load tap-changers are respectively connected to the upper-layer windings of the secondary sides of the A, B, and C phases of the transformer, the input ends of the second group of matrix-type fast on-load tap-changers are respectively connected to the middle-layer windings of the secondary sides of the A, B, and C phases of the transformer, and the input ends of the third group of matrix-type fast on-load tap-changers are respectively connected to the lower-layer windings of the secondary sides of the A, B, and C phases of the transformer; however, the actual installation and connection are not limited to this method.

[0033] Under the connection mode of the above three groups of switches, the specific connection mode of the on-load tap-changer of the secondary winding of this phase, the on-load tap-changer of the secondary winding of the lagging phase, and the on-load tap-changer of the secondary winding of the leading phase in series at the A-phase input end is as follows: the output end of the on-load tap-changer connected to the A-phase winding in the first group of switches, the output end of the on-load tap-changer connected to the B-phase winding in the second group of switches, and the output end of the on-load tap-changer connected to the C-phase winding in the third group of switches are connected end to end in sequence. The head end formed after connection is connected to the A-phase input end of the transformer (simultaneously connected to the input end of the primary A-phase winding of the transformer), and the tail end formed after connection is used as the A-phase output end A' of the transformer; Under the connection mode of the above three groups of switches, the specific connection mode of the on-load tap-changer of the secondary winding of this phase, the on-load tap-changer of the secondary winding of the lagging phase, and the on-load tap-changer of the secondary winding of the leading phase in series at the B-phase input end is as follows: the output end of the on-load tap-changer connected to the B-phase winding in the first group of switches, the output end of the on-load tap-changer connected to the C-phase winding in the second group of switches, and the output end of the on-load tap-changer connected to the A-phase winding in the third group of switches are connected end to end in sequence. The head end formed after connection is connected to the B-phase input end of the transformer (simultaneously connected to the input end of the primary B-phase winding of the transformer), and the tail end formed after connection is used as the B-phase output end B' of the transformer; Under the connection mode of the above three groups of switches, the specific connection mode of the on-load tap-changer of the secondary winding of this phase, the on-load tap-changer of the secondary winding of the lagging phase, and the on-load tap-changer of the secondary winding of the leading phase in series at the C-phase input end is as follows: the output end of the on-load tap-changer connected to the C-phase winding in the first group of switches, the output end of the on-load tap-changer connected to the A-phase winding in the second group of switches, and the output end of the on-load tap-changer connected to the B-phase winding in the third group of switches are connected end to end in sequence. The head end formed after connection is connected to the C-phase input end of the transformer (simultaneously connected to the input end of the primary C-phase winding of the transformer), and the tail end formed after connection is used as the C-phase output end C' of the transformer; After forming the above connection mode, adjusting the three groups of switches can realize the flexible decoupling adjustment of the amplitude and phase angle of the input voltage. In the existing similar schemes, at least 6 controllable switches are required for each layer and each phase of the secondary winding of the transformer, and a total of 6 * 9 = 54 controllable switches are required. The control system for controlling 54 switches and its auxiliary drive system are extremely complex and have poor feasibility. In this embodiment, each of the on-load tap-changers realizes the cross-voltage level adjustment through two gear drive devices, and can realize the separate adjustment of any amplitude and angle (amplitude and angle within the design range), that is, the decoupling adjustment, which greatly simplifies the complexity of the control. At this time, due to the synchronous drive setting of a group of switches, only 2 control quantities are required to control a group of switches. Therefore, the entire control process of direct voltage regulation or power flow control only needs to output 6 drive control quantities. Compared with the control system for controlling 54 switches above, the control process is more simple and clear, and has better feasibility.

[0034] Such as Figure 4As shown, according to the actual application requirements, it can be divided into two major control functions: direct voltage regulation and power flow regulation. Direct voltage regulation is to obtain the voltage grades of each on-load tap changer according to the voltage to be adjusted as needed; power flow regulation independently determines the voltage regulation command through the power command value, and then changes the power flow distribution of the closed-loop system line (such as the closed-loop system formed by two connected lines in the power grid). It is required that the control algorithm finds the voltage regulation command corresponding to the power flow power command, that is, the power command value, and then obtains the voltage grades of each on-load tap changer, that is, the new grades, from the voltage regulation command. Finally, the switch is controlled according to the control quantity corresponding to the new grade to complete the output.

[0035] When performing power flow regulation, since the known quantity during power flow regulation is the power command value, and the transformer realizes power flow control by adjusting the output voltage, in order to achieve power flow control, it is necessary to determine the voltage regulation command value according to the power command value. During the process of determining the voltage regulation command value, based on the above connection method of the three on-load tap changers, combined with the command calculation of the direction function, amplitude-phase decoupling regulation can be realized. In this embodiment, the above S1 can include the following when determining the voltage regulation command value after amplitude-phase decoupling regulation: S101. Calculate the power deviation based on the real-time power value and the power command value of the three-phase shunt transformer; S102. When the power deviation is greater than the set deviation threshold, substitute the real-time power value and the power command value into the preset direction function to calculate the power direction change coefficient; S103. Determine the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase of the three-phase shunt transformer based on the power direction change coefficient and the power deviation; S104. Superimpose the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase on the system real-time voltage vector to obtain the voltage regulation command value after amplitude-phase decoupling regulation.

[0036] Specifically, in the above S101, before calculating the power deviation, it is necessary to obtain the initial amplitude and the initial phase of the initial voltage of the three-phase shunt transformer, the active power and reactive power in the power command value, and the three-phase voltage and current sampling values; calculate the active power and reactive power in the real-time power value according to 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:

[0037] Among them, , respectively represent the active power and reactive power of the real-time power value, respectively represent the voltage sampling values of phases A, B, and C, They respectively represent the sampled values of the three-phase currents of A, B, and C.

[0038] Subsequently, the power deviation, that is, the deviation coefficient, is defined to represent the difference between the real-time power and the power command; the deviation coefficient is calculated according to the following formula:

[0039] In the above S102, the magnitude of the power deviation is judged according to the set deviation threshold. For example, the set deviation threshold is 0.05; it is judged whether holds. If so, considering the time-varying nature of the real-time power and the power command, no voltage regulation is performed, and the steps of the above S101 are repeatedly executed. Otherwise, the subsequent steps of S102 are executed to calculate the power direction change coefficient; Considering the amplitude-phase decoupling characteristics of the transformer, according to the variation relationships among the active power, reactive power, voltage amplitude u, and phase angle θ, a direction function is constructed to obtain the power direction change coefficient. According to the obtained power direction change coefficient and the power deviation, the initial amplitude and the initial phase in the output voltage, that is, the initial voltage, are determined to be changed to the amplitude and the phase in the voltage regulation command value after amplitude-phase decoupling regulation, and the required adjustment amount is obtained, so that the current real-time power is adjusted in the direction of the power command. After the adjustment, the judgment of S101 and the magnitude of the power deviation are repeated.

[0040] In this embodiment, the process of obtaining the power direction change coefficient in the above S102 is expressed as: ; wherein, detection represents the power direction change coefficient, respectively represent the active power and reactive power of the power command value, , respectively represent the active power and reactive power of the real-time power value; α represents the change rate of the active power relative to the voltage amplitude, β represents the change rate of the active power relative to the voltage phase, γ represents the change rate of the reactive power relative to the voltage amplitude, and σ represents the change rate of the reactive power relative to the 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.

[0041] In this embodiment, when calculating the adjustment amount in the above S103, it may include: S1031. Determine the adjustment direction of the voltage amplitude or the adjustment direction of the voltage phase of the three-phase shunt transformer based on the relationship between the power direction change coefficient and the set coefficient threshold; S1032. Determine the adjustment step of the voltage amplitude or the adjustment step of the voltage phase of the three-phase shunt transformer based on the deviation level of the power deviation; S1033. Combine the adjustment direction and the adjustment step of the voltage amplitude or the voltage phase of the three-phase shunt transformer to obtain the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase of the three-phase shunt transformer.

[0042] In this embodiment, the above S1031 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, negatively adjust the voltage amplitude of the three-phase shunt transformer; when the power direction change coefficient is less than -1, positively adjust the voltage amplitude; when the power direction change coefficient is between 0 and 1, negatively adjust the voltage phase of the three-phase shunt transformer; when the power direction change coefficient is between -1 and 0, positively adjust the voltage phase.

[0043] In this embodiment, the above S1032 includes: Based on the deviation level of the power deviation, when the power deviation is a first-level deviation, set the adjustment step of the voltage amplitude or the voltage phase of the three-phase shunt transformer to be one unit step of the voltage amplitude or the voltage phase; When the power deviation is a second-level deviation, set the adjustment step of the voltage amplitude or the voltage phase of the three-phase shunt transformer to be two unit steps of the voltage amplitude or the voltage phase; When the power deviation is a third-level deviation, set the adjustment step of the voltage amplitude or the voltage phase of the three-phase shunt transformer to be three unit steps 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.

[0044] Specifically, the calculation process of the adjustment direction and the adjustment step satisfies the following formula: When the output result of the direction function, that is, the power direction change coefficient, is greater than 1, negatively adjust the voltage amplitude, which is expressed as: ; When the power direction change coefficient is less than -1, positively adjust the voltage amplitude, which is expressed as: ; When the power direction change coefficient is between 0 and 1, negatively adjust the voltage phase, that is, the phase angle decreases, which is expressed as: ; When the power direction change coefficient is between -1 and 0, the voltage phase is adjusted positively, that is, the phase angle increases, which is expressed as: .

[0045] Among them, represents the initial amplitude, represents the initial phase, and respectively represent the amplitude and phase in the voltage regulation command value after amplitude-phase decoupling regulation, is the unit step length of voltage amplitude regulation, is the unit step length of voltage phase angle regulation, and the step length coefficient is positively correlated with the deviation coefficient . When that is, the power deviation is the first-level deviation, ; when that is, the power deviation is the second-level deviation, ; when that is, the power deviation is the third-level deviation, .

[0046] The process of determining the voltage regulation command value from the power command value forms a directional optimization method as shown in Figure 5 .

[0047] When applied to direct voltage regulation of the system, the voltage regulation command is a known quantity at this time and does not need to be calculated through the direction function; after obtaining the voltage regulation command, perform steps S2 to S4 to determine the voltage grade of the on-load tap-changer, and complete the output according to the drive control quantity corresponding to the voltage grade, so as to realize the regulation with the system voltage or power flow as the target. After the regulation is completed, calculate the deviation coefficient again to check whether the regulation result meets the requirements. Generally, it can be regulated in place with one adjustment.

[0048] Specifically, the method of determining the voltage grade of the on-load tap-changer from the voltage regulation command adopts the direct voltage regulation method, and its essence is the look-up table method, and three groups of switch grades closest to the command are found according to the voltage regulation command. The following combines Figure 6 to illustrate the vector relationship between the output voltage of the regulating transformer and the system voltage.

[0049] Figure 6 In is the system voltage, that is, the system real-time voltage vector, is the regulated target voltage, that is, the voltage regulation command value, u is the amplitude of the voltage regulation command, θ is the angle of the voltage regulation command, that is, the phase angle difference between the target voltage and the system voltage, and the output controllable voltage of the voltage regulator is the controllable voltage vector, and after the controllable voltage vector is superimposed with it is the same as Consistency can adjust the system voltage to the target voltage. By subtracting the original system voltage from the voltage regulation command value and calculating the result, the is mapped to the relationship between the preset vector points and their corresponding output voltages. The distances between each vector point and the end point are calculated respectively. The vector point with the minimum distance is the voltage regulation command point, and thus the three-phase voltage levels for synthesizing this voltage regulation command point are obtained.

[0050] Taking Figure 6 the blue voltage regulation command shown as an example, after subtraction, the amplitude is 3 times the voltage regulation step, and the phase angle is 60°. Therefore, it corresponds to the green point as the output voltage regulation command point. The level is the energy-taking voltage level 0 of this phase, the energy-taking voltage of the lagging phase with an angular difference of -120° is -3 levels, and the energy-taking voltage of the leading phase with an angular difference of 120° is level 0.

[0051] Figure 7 The figure shows a comparison of the adjustment processes between the traditional method and the directional optimization method. There are multiple switching paths between the initial level and the level corresponding to the power command. Adopting the directional optimization method can quickly switch from the initial level to the level corresponding to the power command without adjusting step by step like the traditional method. In addition, when the difference between the current power and the command of the present invention is large, it can perform skip-level adjustment to further improve the response time.

[0052] Embodiment 2: A magnitude-phase decoupling regulating transformer provided by the present invention, as shown in Figure 3 and Figure 8 includes: a three-phase shunt transformer and a phase-side secondary winding on-load tap changer, a lagging-phase secondary winding on-load tap changer, and a leading-phase secondary winding on-load tap changer connected in series in sequence at each phase input end of the three-phase shunt transformer; Each of the on-load tap changers realizes cross-voltage level adjustment through two level driving devices 8; The phase-side secondary winding on-load tap changers of each phase of the three-phase shunt transformer are driven synchronously, the lagging-phase secondary winding on-load tap changers of each phase are driven synchronously, and the leading-phase secondary winding on-load tap changers of each phase are driven synchronously; The magnitude-phase decoupling regulating transformer is used to implement the magnitude-phase decoupling regulating transformer control method in the above embodiment.

[0053] Considering that if a traditional regulating device is to have a wide regulation range, it often needs to increase the number of windings, the number of taps, and the number of on-load tap-changers, resulting in a large core size, a large transformer volume, many connections for the on-load tap-changer and many control variables, a complex overall structure of the device, and the on-load tap-changer used cannot achieve cross-range regulation, resulting in a slow regulation speed. With the further improvement of the output capacity and regulation range, the volume and weight of the device will increase sharply, not only occupying a large amount of space, but also bringing great inconvenience in installation, transportation and later maintenance, and the cost will also increase significantly. This solution combines three on-load tap-changers with a three-phase shunt transformer, and the three switches and the transformer windings can be integrated and placed in the same transformer oil tank, appearing as a special transformer externally. At the same time, the three on-load tap-changers do not increase additional losses, and avoid separately designing a regulating switch system outside the transformer, and avoid auxiliary systems such as heat dissipation that need to be designed synchronously. At the same time, the on-load tap-changer can achieve cross-voltage range regulation only through two range driving devices, and the on-load tap-changers driven synchronously in each phase are automatically grouped, so that only 2 control variables are required to control a group of switches. Therefore, only 6 driving control variables need to be determined for the entire control process of direct voltage regulation or power flow control, and the control process is more simple and clear, and has better feasibility. It solves the problem that the traditional regulating device requires a large number of windings, taps, and on-load tap-changers when a wide regulation range is needed. The overall structure of the device is compact, has good economy, occupies a small area, has high reliability, and low losses, and has important popularization value.

[0054] In this embodiment, as Figure 8 shown, the on-load tap-changer includes at least one static contact unit and two moving contact mechanisms 1 that slide independently on the static contact unit. The two moving contact mechanisms 1 are correspondingly connected to the two range driving devices; The static contact unit includes three static contacts 2, and the three static contacts 2 are correspondingly connected to multiple asymmetric taps of the secondary winding of the three-phase shunt transformer. All the static contacts 2 are arranged in a circular array, and there is a spacing between two adjacent static contacts; During the sliding process of each moving contact mechanism 1, a non-powered-off conductive connection switching is realized between the moving contact mechanism 1 and each static contact 2; the moving contact mechanism 1 is connected to the output end of the on-load tap-changer.

[0055] The on-load tap-changer of the present invention enables the two moving contact mechanisms to slide to the static contacts at any potential within one step of movement respectively through the matching of the number of static contacts and moving contact mechanisms, the independent movement characteristics of the two moving contact mechanisms, and the characteristic that all static contacts are arranged in a circular array. By combining and connecting the static contacts at multiple potentials in pairs, the cooperation between three input terminals is realized, forming 7 voltage regulation grades, thereby realizing variable step voltage regulation and one-step switching to any voltage regulation grade, solving the disadvantages of traditional on-load tap-changers that cannot achieve cross-grade regulation, fast regulation, variable step regulation, etc.; it also solves the problems of a large number of switches, large floor area, and inability to be integrated with other primary equipment such as transformers when using multiple ordinary external switches to achieve fast on-load regulation. It is used in application fields such as voltage / power flow / power regulation of transmission / distribution networks and railway traction, new energy power stations, industrial and commercial power supply voltage regulation, load voltage regulation, smelting process regulation, etc.

[0056] In this embodiment, 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 slide independently along the two circumferential surfaces respectively.

[0057] It should be noted that all the static contact units constitute the static contact mechanism, and the two circumferential surfaces are the two circumferential surfaces of the static contact mechanism. The number of static contacts 2 in the static contact mechanism is 3*N, N≥1, and N is the number of static contact units; In this embodiment, as Figure 8 shown, the static contact 2 is a double-sided static contact. The double-sided static contact includes an inner static contact and an outer static contact. The two contacts are directly connected by a conductor, forming an integral structure in an I-shaped structure and having the same potential; in addition, the inner static contact, the outer static contact, and the conductor can also be the inner and outer two conductive surfaces of the same conductor; All the static contacts 2 form a ring. The outer conductive surface or the outer static contact forms the circumferential surface on the outer side of the ring, and the inner conductive surface or the inner static contact forms the circumferential surface on the inner side of the ring. The two moving contact mechanisms 1 are arranged on the inner and outer sides of the ring respectively, showing a three-layer sleeve type layout, with a compact installation structure and a reasonable layout; In another possible implementation manner, the two circumferential surfaces are both located on the same side of the ring, that is, the outer side or the inner side; the diameters of the two circumferential surfaces are the same and are arranged in layers; at this time, the two moving contact mechanisms 1 are both located on the same side of the ring, showing a two-layer sleeve type layout with the static contact mechanism, and the two moving contact mechanisms 1 and the two circumferential surfaces are arranged in corresponding layers; In another possible implementation manner, the two circumferential surfaces are arranged on two opposite ring width surfaces of the ring; at this time, one moving contact mechanism 1, the static contact mechanism, and the other moving contact mechanism 1 are arranged in sequence along the axis of the static contact mechanism.

[0058] In this embodiment, each of the moving contact mechanisms 1 includes a turntable 3 arranged coaxially with the circumferential surface, a transition current limiter 4 electrically connected and fixed to the turntable 3, an adaptive non-linear voltage limiter 5, and a metal pole rod 6; One ends of the transition current limiter 4, the adaptive non-linear voltage limiter 5, and the metal pole rod 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 non-linear voltage limiter 5, and the metal pole rod 6 are in sliding contact with the conductive surface; the distance between the transition current limiter 4 and the metal pole rod 6 is less than the width of the conductive surface and greater than a set electrical insulation clearance; the turntable 3 is connected to the output end of the on-load tap-changer.

[0059] It should be noted that the above three layout relationships between the two moving contact mechanisms 1 and the static contact mechanism 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 non-linear voltage limiter 5, and the metal pole rod 6 together form a sliding mechanism, which is arranged between the turntable 3 and the static contact mechanism and is in sliding cooperation with the conductive surface of the static contact 2.

[0060] In this embodiment, the two turntables 3 in the two moving contact mechanisms 1 are respectively denoted as the inner turntable and the outer turntable. Both turntables 3 can rotate clockwise and counterclockwise, and the inner / outer turntables serve as the two output ends of this on-load tap-changer; as Figure 9 shown, the transition current limiter 4 includes a transition current limiter Z1 and a transition current limiter Z2, the adaptive non-linear voltage limiter 5 includes an adaptive non-linear voltage limiter BV1 and an adaptive non-linear voltage limiter BV2, and the metal pole rod 6 includes a metal pole rod P1 and a metal pole rod P2; Z1, BV1, and P1 form an inner sliding mechanism arranged on the inner turntable, and Z2, BV2, and P2 form an outer sliding mechanism arranged on the outer turntable.

[0061] The transition impedance, that is, the transition current limiter 4 has the characteristic of limiting current and is composed of elements with resistance, inductance, or capacitance characteristics. One end of it is fixedly electrically connected to the turntable 3, and the other end is connected to a conductive sliding block, and the conductive sliding block is used for sliding contact with the static contact 2; The metal pole rod 6 is composed of a metal material with good electrical conductivity, such as a copper conductor, etc. One end of it is fixedly electrically connected to the turntable 3, and the other end is connected to a conductive sliding block, and the conductive sliding block is used for sliding contact with the static contact 2.

[0062] One end of the adaptive non-linear voltage limiter 5 is fixedly electrically connected to the turntable 3, and the other end is connected to a conductive sliding block, and the conductive sliding block is used for sliding contact with the static contact 2, which can achieve overvoltage protection; In another possible implementation, the above-mentioned sliding mechanism may only adopt the transition current limiter 4 and the metal pole bar 6, and can also achieve the non-power-off conductive connection switching between the sliding process and each of the static contacts 2 and the one-step switching between any voltage adjustment gears, but it is easy to cause the transition current limiter 4 to fuse; In this embodiment, an adaptive non-linear voltage limiter 5 is arranged between the transition current limiter 4 and the metal pole bar 6, which can achieve the protection against overvoltage and avoid the transition current limiter 4 from fusing.

[0063] In this embodiment, when the voltage between the adaptive non-linear voltage limiter 5 and the static contact 2 in contact therewith is greater than or equal to the set voltage protection value, the impedance of the adaptive non-linear voltage limiter 5 is less than the set lower impedance limit value; When the voltage between the adaptive non-linear voltage limiter 5 and the static contact 2 in contact therewith is less than the voltage protection value, the impedance of the adaptive non-linear voltage limiter 5 is greater than the set upper impedance limit value.

[0064] Specifically, the adaptive non-linear voltage limiter 5 has the overvoltage protection characteristic of limiting voltage and is used to protect against overvoltage during abnormal switching; during the switching process, for example, when only the transition resistance, that is, the branch of the transition current limiter 4, is powered, such as when the metal pole bar 6 may be in a suspended state between two static contacts, if the transition impedance is burned out due to overcurrent or other reasons, at this time the entire power supply loop presents an open circuit state, that is, it is easy to have an excessive voltage between the moving and static contacts, exceeding the set voltage protection value, and overvoltage breakdown hazards will occur; the usually designed voltage protection value is a transition interval, for example, 1800V - 2200V, for example, the pole voltage between the moving and static contacts is 600V under normal conditions; when the voltage between the moving and static contacts exceeds or is equal to 2200V, the adaptive non-linear voltage limiter 5 automatically adjusts its impedance characteristic and presents a low impedance characteristic, and at this time the voltage between the moving and static contacts is limited within the 2200V safety range; if it is lower than 1800V, that is, the adaptive non-linear 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 - 2200V, it is in the state of the transition resistance, and the voltage between the moving and static contacts is limited between 1800V - 2200V. If the control device detects that the voltage between the moving and static contacts appears in the state of 600V - 2200V, it can be determined that there is a problem with the overcurrent loop of the moving contact, and the switching needs to be stopped; it solves the safety problems such as overvoltage damage to the switch and transformer short circuit caused by the inability of the traditional on-load tap-changer to achieve the open circuit of the switch adjustment loop.

[0065] In this embodiment, the adaptive non-linear voltage limiter 5 includes one of the following: Zener diode, switching thyristor, varistor.

[0066] 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 ascending order, and the coding is cycled among multiple static contact units. The static contacts 2 with the same coding in each static contact unit are connected through an interconnection bus 9. After the static contacts 2 with the same coding are connected, they are correspondingly connected to the three input ends of the on-load tap-changer, and the three input ends are correspondingly connected to multiple asymmetric taps of the secondary winding of the three-phase shunt transformer.

[0067] Specifically, at this time, all the static contacts 2 are arranged in a circular form. Each static contact 2 is also an electrode. Each static contact / electrode is coded in a specific cyclic coding form. The coding method is a cyclic method along the circumferential direction, and both clockwise and counterclockwise are acceptable. For example, Figure 8 as shown in the figure, the cyclic coding of all the static contacts 2 in the clockwise direction along the circumference is: ①, ②, ③, ①, ②, ③... The total number of electrodes, that is, all the static contacts 2, is 3*N, where N≥1 and N is the number of static contact units; Figure 8 The coding ①, ②, ③ in the figure is both the number of the static contact 2 where the coding is located and the number of the interconnection bus 9 where the coding is located; The static contacts / electrodes with the same coding are connected through a conductive interconnection bus 9 and have the same potential; the number of interconnection buses 9 is the same as the number of types of static contact coding. The interconnection buses 9 include interconnection bus ①, interconnection bus ②, and interconnection bus ③, and each interconnection bus is independent of each other; after the interconnection, a terminal is led out. The coding of this terminal is the same as the coding of the static contact / electrode. At the same time, this terminal is used as the input end of the switch and is used to connect to a power source or a transformer winding; for example, Figure 8 as shown in the figure, all the electrodes with coding ① are connected through interconnection bus ①, all the electrodes with coding ② are connected through interconnection bus ②, and all the electrodes with coding ③ are connected through interconnection bus ③. After the connection, terminals 1, 2, and 3 are respectively led out as input end ①, input end ②, and input end ③; At this time, a set of moving contacts can be set at the positions with the same static contact number, or only the moving contact structure of the part in contact with the static contact can be set; the connection method and action method of each set of moving contacts are exactly the same. During operation, mutual backup can be realized. When one or two sets of moving contacts are in poor contact or abnormal contact, the normal operation of the device can still be ensured, which greatly improves the service life of the entire on-load tap-changer and the reliability of the overall equipment.

[0068] In this embodiment, two gear driving devices 8 and a controller 7 electrically connected to the gear driving device 8 form a control device. The gear driving device 8 drives the inner turntable and the outer turntable respectively, and is used to link the above-mentioned sliding mechanism to realize gear shifting adjustment; the controller 7 is used to implement the amplitude-phase decoupling adjustment transformer control method in the above-mentioned embodiment, provide driving instructions for the gear driving device 8, and is also used to identify and process various states inside the switch.

[0069] As Figure 3 shown, the two gear driving devices 8 are divided into an inner gear driving device and an outer gear driving device. In a group of switches of the above-mentioned regulating transformer, the inner turntables of each group of three on-load tap-changers share one inner gear driving device, and the outer turntables share one outer gear driving device. Therefore, each group of switches has only 2 control variables, and these 2 control variables can be synchronized and effective, and can realize the switching between any gears in one step, providing a feasible basis for simplifying the overall control.

[0070] When the present invention is actually used, taking the on-load tap-changer connected to the secondary winding of phase A in the first group of switches as an example, the secondary winding of phase A has three taps, and the three input ends of the on-load tap-changer are correspondingly connected to the three taps to take out different voltages, such as Figure 10 shown, where the voltage u1 is connected between input end ① and input end ②, and the voltage u2 is connected between input end ② and input end ③. Then, the control device makes the gear driving device 8 drive the turntable 3 to drive the sliding mechanism to rotate. When it rotates to different static contact 2 positions, 7 voltage states u can be output between output end ① and output end ②, that is, 7 gears, including: (1) When the inner turntable drives the inner sliding mechanism to rotate to the static contact 2 encoded as ① (hereinafter referred to as electrode ①), and the outer turntable drives the outer sliding mechanism to rotate to the static contact 2 encoded as ② (hereinafter referred to as electrode ②), the output voltage between output end ① and output end ② is u1, which is the voltage gear 1; It should be noted that the implementation principle of one-step switching between any voltage adjustment gears is illustrated by taking the slippage of the outer sliding mechanism of this gear as an example: As Figure 8 shown, before gear shifting, when the outer sliding mechanism is located at electrode ①, the outer turntable drives the outer sliding mechanism to rotate clockwise by a step length of the width of a static contact to electrode ②, realizing one-step switching in place; before gear shifting, when the outer sliding mechanism is located at electrode ③, the outer turntable drives the outer sliding mechanism to rotate counterclockwise by a step length of the width of a static contact to electrode ②, realizing one-step switching in place; Combined with the same principle to control the sliding of the inner sliding mechanism, so as to realize any combination of the inner and outer static contacts and realize one-step switching in place between any voltage adjustment gears; (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 level -1; (3)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 static contact 2 coded as ③ (hereinafter referred to as electrode ③), the output voltage between output terminal ① and output terminal ② is u2, which is voltage level 2; (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 level -2; (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; (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 voltage level -3; (7)When the inner sliding mechanism and the outer sliding mechanism rotate to static contacts 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 also 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 also 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 also rotate to electrode ③; the output voltage between output terminal ① and output terminal ② is 0, which is voltage level 0.

[0071] Summarize the above voltage level adjustment rules into Table 2. When it is necessary to adjust to a certain target level, refer to the corresponding relationship between the voltage level and the static contact in Table 2.

[0072] Table 2 Corresponding relationship between voltage level and static contact

[0073] The 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 in a non-fixed interval, which is suitable for different scenario requirements.

[0074] It should be noted that the control device controls the two moving contact mechanisms 1 to independently perform a non-power-off switching between the respective static contacts 2 of the static contact unit. Therefore, when the number of static contact units is multiple, both of the two moving contact mechanisms 1 can slide and switch across the static contact units, so as to achieve a one-step switching in place between any voltage adjustment gears.

[0075] When the control device controls the two moving contact mechanisms 1 to independently perform a non-power-off switching between the respective static contacts 2 of the static contact unit, the process of the sliding mechanism of the moving contact mechanism 1 performing a non-power-off switching from the current static contact 2 to the adjacent static contact 2 includes: When the rotating direction is from the transition current limiter 4 to the metal pole bar 6 (for example, Figure 8 in the clockwise direction in the figure), driven by the turntable 3, the metal pole bar 6 first moves from the current static contact 2 to the adjacent static contact 2, and the transition current limiter 4 and the adaptive non-linear voltage limiter 5 move synchronously with the metal pole bar 6. When the metal pole bar 6 separates from the current static contact 2 and has not reached the adjacent static contact 2, the current passes through the transition current limiter 4 to maintain the power supply continuity, so that the current is not interrupted when the metal pole bar 6 separates from the current static contact 2; the adaptive non-linear voltage limiter 5 prevents the loop from being damaged by overvoltage breakdown due to abnormal resistance open circuit during the switching process. When the rotating direction is from the metal pole bar 6 to the transition current limiter 4 (for example, Figure 8 in the counterclockwise direction in the figure), driven by the turntable 3, the transition current limiter 4 first moves from the current static contact 2 to the adjacent static contact 2, and the adaptive non-linear voltage limiter 5 and the metal pole bar 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 bar 6 separates from the current static contact 2; the adaptive non-linear voltage limiter 5 prevents the loop from being damaged by overvoltage breakdown due to abnormal resistance open circuit during the switching process.

[0076] Specifically, to achieve gear shifting, taking the clockwise sliding of the outer sliding mechanism as an example, the non-power-off switching process is described as follows: As Figure 11 shown, the slip switching steps are a1→b1→c1→d1→e1. The position shown in step a1 is the initial position, located at the position of electrode ②; Turn right to the position shown in step b1, where the metal pole bar P2 is located between electrode ② and electrode ③. At this time, the current passes through the transition impedance Z2 to ensure continuous power supply without power loss during the switching process. The adaptive non-linear voltage limiter BV2 can prevent the loop from being damaged by overvoltage breakdown due to abnormal resistance open circuit during this process; Continue to turn right to the position shown in step c1, where the metal pole bar P2 is located at the position of electrode ③. At this time, the transition impedance Z2 limits the short-circuit current between electrode ② and electrode ③, and the output power supply is provided by electrode ③; Continue to turn right to the position shown in step d1. The metal pole P2 is at the position of electrode ③. At this time, the transition impedance Z2 is between electrode ② and electrode ③, the short-circuit current disappears, and the output power supply is provided by electrode ③. Continue to turn right to the position shown in step e1. The transition impedance Z2, the metal pole P2, and the adaptive non-linear voltage limiter BV2 are all at the position of electrode ③. Thus, the position switching from electrode ② to electrode ③ is completed. The process of rotating left, i.e., counterclockwise rotation, and the switching process of the inner sliding mechanism are similar to the above process.

[0077] 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, and has functions of rotational angle positioning, forward / backward rotation, and rotational position feedback. The switch includes a set of control systems, which are used to issue control instructions for the inner / outer drivers, control the rotational angle and rotation direction of each driver, receive various status feedback information, and implement the protection and alarm functions.

[0078] Special note: Driven by the turntable, the sliding mechanism can rotate (forward or backward) to any one of the positions of electrode ①, electrode ②, and electrode ③ at one time.

[0079] Embodiment 3: Based on the same inventive concept, the present invention also provides a magnitude-phase decoupling regulation transformer control system, as Figure 12 shown, including: An instruction calculation module, which is used to determine the voltage regulation instruction value after magnitude-phase decoupling regulation based on the real-time power value and power instruction value of the three-phase shunt transformer, and by using a preset direction function. A data processing module, which is used to subtract the voltage regulation instruction value from the system real-time voltage vector to obtain a controllable voltage vector. An instruction determination module, which is used to map the controllable voltage vector into the voltage vector space, and take the voltage adjustable vector point in the voltage vector space with the smallest distance from the end point of the controllable voltage vector as the voltage regulation instruction point; wherein, the voltage adjustable vector point is formed by superimposing the output voltages after voltage grade regulation of the on-load tap-changer of the secondary winding of this phase, the on-load tap-changer of the secondary winding of the lagging phase, and the on-load tap-changer of the secondary winding of the leading phase, which are successively connected in series at the input end of each phase of the three-phase shunt transformer. A control module, which is used to determine the voltage grades of the on-load tap-changer of the secondary winding of this phase, the on-load tap-changer of the secondary winding of the lagging phase, and the on-load tap-changer of the secondary winding of the leading phase corresponding to the voltage regulation instruction point, and control the three-phase shunt transformer according to the voltage grades.

[0080] In this embodiment, the instruction calculation module includes: A first calculation unit, configured to calculate a power deviation based on a real-time power value and a power command value of a three-phase shunt transformer; A second calculation unit, configured to substitute the real-time power value and the power command value into a preset direction function to calculate a power direction change coefficient when the power deviation is greater than a set deviation threshold; A third calculation unit, configured to determine an adjustment amount of the voltage amplitude or an adjustment amount of the voltage phase of the three-phase shunt transformer based on the power direction change coefficient and the power deviation; A fourth calculation unit, configured to superimpose the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase onto the system real-time voltage vector to obtain a voltage adjustment command value after amplitude-phase decoupling adjustment.

[0081] In this embodiment, the power direction change coefficient is expressed as: ; Wherein, detection represents the power direction change coefficient, respectively represent the active power and reactive power of the power command value, , respectively represent the active power and reactive power of the real-time power value; α represents the change rate of active power relative to the voltage amplitude, β represents the change rate of active power relative to the voltage phase, γ represents the change rate of reactive power relative to the voltage amplitude, and σ represents the change rate of reactive power relative to the 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.

[0082] In this embodiment, the third calculation unit includes: An adjustment direction determination subunit, configured to determine an adjustment direction of the voltage amplitude or an adjustment direction of the voltage phase of the three-phase shunt transformer based on the relationship between the power direction change coefficient and a set coefficient threshold; An adjustment step determination subunit, configured to determine an adjustment step of the voltage amplitude or an adjustment step of the voltage phase of the three-phase shunt transformer based on the deviation level of the power deviation; An adjustment amount determination subunit, configured to combine the adjustment direction and the adjustment step of the voltage amplitude or the voltage phase of the three-phase shunt transformer to obtain an adjustment amount of the voltage amplitude or an adjustment amount of the voltage phase of the three-phase shunt transformer.

[0083] In this embodiment, the adjustment direction determination subunit is specifically configured to: 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.

[0084] In this embodiment, the adjustment step determination subunit is configured to: Based on the deviation level of the power deviation, when the power deviation is a first-level deviation, the adjustment step of the voltage amplitude or the voltage phase of the three-phase parallel transformer is one unit step of the voltage amplitude or the voltage phase; when the power deviation is a second-level deviation, the adjustment step of the voltage amplitude or the voltage phase of the three-phase parallel transformer is two unit steps of the voltage amplitude or the voltage phase; when the power deviation is a third-level deviation, the adjustment step of the voltage amplitude or the voltage phase of the three-phase parallel transformer is three unit steps 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.

[0085] In this embodiment, the on-load tap-changers of the secondary windings of the corresponding phases of the three-phase parallel transformer are synchronously driven, the on-load tap-changers of the secondary windings of the lagging phases of each phase are synchronously driven, and the on-load tap-changers of the secondary windings of the leading phases of each phase are synchronously driven.

[0086] Embodiment 4 As Figure 13 shown, the present invention further provides an electronic device, which may be a computer device, a single-chip microcomputer device, a smart mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, the processor, and the transceiver component are connected through a bus; the memory can be used to store an execution program, and an exemplary execution program may include instructions; the processor is used to execute the instructions stored in the memory. The memory can also be used to store data, and this data can be called and / or modified when the instructions are executed.

[0087] The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of a phase-amplitude decoupling regulation transformer control method in the above embodiments.

[0088] Embodiment 5 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 in the electronic device, used to store programs and data. It can be understood that the storage medium here can include both the built-in storage medium in the electronic device, and of course can also include the extended storage medium supported by the electronic device. The storage medium provides a storage space, and this storage space stores the operating system of the terminal. And, one or more instructions suitable for being loaded and executed by the processor are also stored in this storage space. These instructions can be one or more executable programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory, or a non-volatile memory, such as at least one disk memory. By loading and executing one or more instructions stored in the storage medium by the processor, the steps of a phase-amplitude decoupling regulation transformer control method in the above embodiments can be implemented.

[0089] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0090] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, and combinations of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device produce means for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0091] These computer program instructions can 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, such that the instructions stored in the computer-readable memory produce a manufactured article including instruction means that implement the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0092] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the scope of its protection. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that after reading the present invention, various changes, modifications, or equivalent replacements can still be made to the specific implementation manners of the application. However, these changes, modifications, or equivalent replacements are all within the scope of the protection of the claims of the present invention.

Claims

1. A control method for a phase-amplitude decoupling regulating transformer, characterized in that, Including: Based on the real-time power value and the power command value of the three-phase shunt transformer, using a preset direction function, determine the voltage regulation command value after amplitude-phase decoupling regulation; Subtract the system real-time voltage vector from the voltage regulation command value to obtain a controllable voltage vector; Map the controllable voltage vector into the voltage vector space, and take the voltage adjustable vector point with the minimum distance from the end point of the controllable voltage vector in the voltage vector space as the voltage regulation command point; wherein, the voltage adjustable vector point is formed by the superposition of the output voltages after the voltage grade adjustment of the on-load tap-changer of the secondary winding of this phase, the on-load tap-changer of the secondary winding of the lagging phase, and the on-load tap-changer of the secondary winding of the leading phase connected in series at the input end of each phase of the three-phase shunt transformer; Based on the voltage regulation command point, determine the voltage grades of the on-load tap-changer of the secondary winding of this phase, the on-load tap-changer of the secondary winding of the lagging phase, and the on-load tap-changer of the secondary winding of the leading phase corresponding to the voltage regulation command point, and control the three-phase shunt transformer according to the voltage grades.

2. The method according to claim 1, wherein The step 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 shunt transformer, using a preset direction function, includes: Based on the real-time power value and the power command value of the three-phase shunt transformer, calculate the power deviation; When the power deviation is greater than the set deviation threshold, substitute the real-time power value and the power command value into the preset direction function to calculate the power direction change coefficient; Based on the power direction change coefficient and the power deviation, determine the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase of the three-phase shunt transformer; Superimpose the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase onto the system real-time voltage vector to obtain the voltage regulation command value after amplitude-phase decoupling regulation.

3. The method according to claim 2, wherein The power direction change coefficient is expressed as: ； Among them, detection represents the power direction change coefficient, respectively represent the active power and reactive power of the power command value, 、 respectively represent the active power and reactive power of the real-time power value; α represents the change rate of active power relative to the voltage amplitude, β represents the change rate of active power relative to the voltage phase, γ represents the change rate of reactive power relative to the voltage amplitude, and σ represents the change rate of reactive power relative to the 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, characterized in that, The step of determining the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase of the three-phase shunt transformer based on the power direction change coefficient and the power deviation, includes: Based on the relationship between the power direction change coefficient and the set coefficient threshold, determine the adjustment direction of the voltage amplitude or the adjustment direction of the voltage phase of the three-phase shunt transformer; Based on the deviation level of the power deviation, determine the adjustment step of the voltage amplitude or the adjustment step of the voltage phase of the three-phase shunt transformer; Combine the adjustment direction and the adjustment step of the voltage amplitude or the voltage phase of the three-phase shunt transformer to obtain the adjustment amount of the voltage amplitude or the adjustment amount of the voltage phase of the three-phase shunt transformer.

5. The method according to claim 4, wherein The step of determining the adjustment direction of the voltage amplitude or the adjustment direction of the voltage phase of the three-phase shunt transformer based on the relationship between the power direction change coefficient and the set coefficient threshold, 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 Determining the adjustment step of the voltage amplitude or the adjustment step of the voltage phase of the three-phase parallel transformer based on the deviation level of the power deviation includes: Based on the deviation level of the power deviation, when the power deviation is a first-level deviation, the adjustment step of the voltage amplitude or the voltage phase of the three-phase parallel transformer is one unit step of the voltage amplitude or the voltage phase; When the power deviation is a second-level deviation, the adjustment step of the voltage amplitude or the voltage phase of the three-phase parallel transformer is two unit steps of the voltage amplitude or the voltage phase; When the power deviation is a third-level deviation, the adjustment step of the voltage amplitude or the voltage phase of the three-phase parallel transformer is three unit steps 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 1-3, characterized in that, The on-load tap-changer of the in-phase secondary winding of each phase of the three-phase parallel transformer is synchronously driven, the on-load tap-changer of the lagging-phase secondary winding of each phase is synchronously driven, and the on-load tap-changer of the leading-phase secondary winding of each phase is synchronously driven.

8. A phase-amplitude decoupling regulating transformer, characterized in that, It includes: A three-phase parallel transformer and an on-load tap-changer of the in-phase secondary winding, an on-load tap-changer of the lagging-phase secondary winding, and an on-load tap-changer of the leading-phase secondary winding connected in series in sequence at each phase input end of the three-phase parallel transformer; Each of the on-load tap-changers realizes cross-voltage gear adjustment through two gear driving devices; The on-load tap-changer of the in-phase secondary winding of each phase of the three-phase parallel transformer is synchronously driven, the on-load tap-changer of the lagging-phase secondary winding of each phase is synchronously driven, and the on-load tap-changer of the leading-phase secondary winding of each phase is synchronously driven; The amplitude-phase decoupling regulating transformer is used to implement the method of claim 1 above.

9. The amplitude-phase decoupling and regulating transformer according to claim 8, wherein, The on-load tap-changer includes at least one static contact unit and two moving contact mechanisms (1) that independently slide on the static contact unit, and the two moving contact mechanisms (1) are correspondingly connected to the two gear driving devices; The static contact unit includes three static contacts (2), and the three static contacts (2) 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 circular array, and there is a spacing between adjacent two of the static contacts; During the sliding process of each moving contact mechanism (1), a continuously powered conductive connection switching is realized between the moving contact mechanism (1) and each of the static contacts (2); the moving contact mechanism (1) is connected to the output end of the on-load tap-changer.

10. The amplitude-phase decoupling and regulating transformer according to claim 9, wherein Each of the static contacts (2) has two conductive surfaces. 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. A phase-amplitude decoupling and regulating transformer as claimed in claim 10, characterized in that, Each of the moving contact mechanisms (1) includes a turntable (3) arranged coaxially with the circumferential surface, a transition current limiter (4) electrically connected and fixed on the turntable (3), an adaptive non-linear voltage limiter (5), and a metal pole rod (6); One ends of the transition current limiter (4), the adaptive non-linear voltage limiter (5), and the metal pole rod (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 non-linear voltage limiter (5), and the metal pole rod (6) are in sliding contact with the conductive surface; the distance between the transition current limiter (4) and the metal pole rod (6) is less 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.

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

13. A phasor-amplitude decoupled 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 multiple static contact units are coded cyclically. The static contacts (2) with the same code in each static contact unit are connected by an interconnection busbar (9). After the static contacts (2) with the same code are connected, they are correspondingly connected to the three input ends of the on-load tap-changer, and the three input ends are correspondingly connected to multiple asymmetric taps of the secondary winding of the three-phase shunt transformer.

14. A control system for a phase-amplitude decoupling and regulating transformer, characterized in that, Including: An instruction calculation module, configured to determine the voltage regulation instruction value after amplitude-phase decoupling regulation based on the real-time power value and the power instruction value of the three-phase shunt transformer by using a preset direction function; A data processing module, configured to subtract the voltage regulation instruction value from the system real-time voltage vector to obtain a controllable voltage vector; An instruction determination module, configured to map the controllable voltage vector into the voltage vector space, and use the voltage adjustable vector point with the smallest distance from the end point of the controllable voltage vector in the voltage vector space as the voltage regulation instruction point; wherein, the voltage adjustable vector point is formed by superimposing the output voltages after voltage grade adjustment by the on-load tap-changers of the secondary windings of the corresponding phases, the on-load tap-changer of the lagging-phase secondary winding, and the on-load tap-changer of the leading-phase secondary winding, which are connected in series at each phase input end of the three-phase shunt transformer. A control module, configured to determine voltage grades of the on-load tap-changer of the primary side winding of the present phase, the on-load tap-changer of the lagging phase secondary side winding, and the on-load tap-changer of the leading phase secondary side winding corresponding to the voltage regulation instruction point based on the voltage regulation instruction point, and perform control of the three-phase parallel transformer according to the voltage grades.

15. An electronic device, characterized in that, It includes: At least one processor and a memory; The memory and the processor are connected through a bus; The memory is configured 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 1-7 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 1-7 is implemented.

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