Bidirectional controllable reactor and control system, control method and electronic equipment thereof

Abstract

This application relates to a bidirectional controllable reactor and its control system, control method, and electronic equipment. The method includes: the bidirectional controllable reactor comprising: a core column with a working winding wound on it, the working winding receiving AC voltage and generating an axial magnetic field; a core disc, the core disc being circular and coaxially pressed at a predetermined position along the axial direction of the core column; the core disc comprising core blocks and permanent magnets alternately arranged along the circumferential direction; and a control winding wound on the core disc, the control winding receiving control current and generating a circumferential control magnetic field, the circumferential control magnetic field being superimposed with the magnetic field generated by the permanent magnet to adjust the inductance of the bidirectional controllable reactor. This method enables the reactor to have bidirectional adjustable characteristics.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a bidirectional controllable reactor and its control system, control method and electronic equipment. Background Technology

[0002] Controllable reactors have wide applications in power systems, power electronics, and power quality in new energy sources. They can be used for current sharing in power converters, reactive power regulation in power systems, harmonic suppression, end-point voltage adjustment, and tuning filtering. As a type of controllable reactor, the controllable saturated reactor consists of a core and windings (working winding and control winding). Its working principle is as follows: by adjusting the control current in the control winding, the saturation level of the core is changed, thereby changing the inductance of the reactor and thus adjusting its capacity.

[0003] However, the inductance change of a controllable saturated reactor is unidirectional, meaning that as long as a control current is applied, whether it is a forward or reverse current, the inductance of the reactor will decrease. This characteristic limits the application range of controllable reactors. Summary of the Invention

[0004] Therefore, it is necessary to provide a bidirectional controllable reactor with bidirectional adjustment characteristics, as well as its control system, control method, and electronic equipment, to address the aforementioned technical problems.

[0005] In a first aspect, this application provides a bidirectional controllable reactor, comprising:

[0006] A core post, on which a working winding is wound, the working winding being used to receive AC voltage and generate an axial magnetic field;

[0007] The iron core disc is circular in shape and is coaxially pressed onto a predetermined position along the axial direction of the iron core column; the iron core disc includes iron core blocks and permanent magnets alternately arranged along the circumferential direction;

[0008] A control winding is wound on the iron core disc. The control winding is used to receive control current and generate a circumferential control magnetic field. The circumferential control magnetic field is superimposed with the magnetic field generated by the permanent magnet and used to adjust the inductance of the bidirectional controllable reactor.

[0009] In one embodiment, the number of iron core blocks is the same as the number of permanent magnets, and there are multiple permanent magnets arranged symmetrically in the circumferential direction of the iron core disc.

[0010] In one embodiment, the core block is formed by stacking multiple involute silicon steel sheets.

[0011] In one embodiment, the core disc is located at the midpoint of the core column's axial direction.

[0012] Secondly, this application provides a three-phase AC bidirectional controllable reactor, comprising: three bidirectional controllable reactors provided in the first aspect embodiments.

[0013] Thirdly, this application provides a control system for a bidirectional controllable reactor, comprising:

[0014] The first aspect of the embodiment provides a bidirectional controllable reactor;

[0015] An adaptive controller is used to adjust the inductance of the bidirectional controllable reactor.

[0016] Fourthly, this application provides a control method for a bidirectional controllable reactor, applied to an adaptive controller in the control system provided in the third aspect embodiment, the method comprising:

[0017] The target DC control current is determined based on the AC current of the working winding of the bidirectional controllable reactor, the current inductance of the bidirectional controllable reactor, and the target inductance.

[0018] The target DC control current is applied to the control winding of the bidirectional controllable reactor to reduce or increase the inductance of the bidirectional controllable reactor.

[0019] In one embodiment, the target DC control current includes a target positive half-cycle DC current and a target negative half-cycle DC current with equal amplitude within one AC cycle; determining the target DC control current based on the AC current of the working winding of the bidirectional controllable reactor, the current inductance of the bidirectional controllable reactor, and the target inductance includes: determining the deviation between the current inductance and the target inductance; performing controllable rectification on the positive and negative half-cycle currents of the AC current according to the deviation, and adjusting the firing angle of the controllable rectification according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current; applying the target DC control current to the control winding of the bidirectional controllable reactor includes: alternately applying the target positive half-cycle DC current and the target negative half-cycle DC current to the control winding.

[0020] In one embodiment, the step of controllingly rectifying the positive and negative half-cycle currents of the AC current according to the deviation, and adjusting the firing angle of the controllable rectification according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current includes: when the deviation is less than 0, controllingly rectifying the positive and negative half-cycle currents of the AC current, and increasing the firing angle of the controllable rectification according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current; when the deviation is greater than 0, controllingly rectifying the positive and negative half-cycle currents of the AC current, and decreasing the firing angle of the controllable rectification according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current.

[0021] Fifthly, this application also provides a control device for a bidirectional controllable reactor, comprising:

[0022] The determination module is used to determine the target DC control current based on the AC current of the working winding of the bidirectional controllable reactor, the current inductance of the bidirectional controllable reactor, and the target inductance.

[0023] An adjustment module is used to apply the target DC control current to the control winding of the bidirectional controllable reactor to reduce or increase the inductance of the bidirectional controllable reactor.

[0024] In a sixth aspect, this application also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the control method for the bidirectional controllable reactor provided in the first aspect of this application.

[0025] In a seventh aspect, this application also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the control method for the bidirectional controllable reactor provided in the first aspect of this application.

[0026] Eighthly, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the control method for the bidirectional controllable reactor provided in the first aspect of this application.

[0027] The aforementioned bidirectional controllable reactor and its control method, system, device, electronic equipment, computer-readable storage medium, and computer program product, the bidirectional controllable reactor comprising: an iron core column, on which a working winding is wound, the working winding being used to receive AC voltage and generate an axial magnetic field; an iron core disc, the iron core disc being circular and coaxially pressed at a preset position along the axial direction of the iron core column; the iron core disc comprising iron core blocks and permanent magnets alternately arranged along the circumferential direction; and a control winding on which a control winding is wound, the control winding being used to receive control current and generate a circumferential control magnetic field, the circumferential control magnetic field being superimposed with the magnetic field generated by the permanent magnet to adjust the inductance of the bidirectional controllable reactor. As can be seen, in this bidirectional controllable reactor, the iron core block and permanent magnet are alternately arranged along the circumference to form an iron core disc. By passing a control current through the control winding wound on the iron core disc, a circumferential control magnetic field is generated in the control winding. The circumferential control magnetic field can be changed by changing the control current, thereby changing the total circumferential magnetic field superimposed on the magnetic field of the permanent magnet. By changing the total circumferential magnetic field, the axial permeability of the iron core disc is adjusted, thereby adjusting the inductance of the reactor. This makes the inductance of the working winding decrease as the control current increases and increase as the control current decreases, thus giving the reactor a bidirectional adjustable characteristic. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a three-phase AC bidirectional controllable reactor in one embodiment;

[0030] Figure 2 This is a schematic diagram of the iron core disc in one embodiment;

[0031] Figure 3 This is a flowchart illustrating the control method of a bidirectional controllable reactor in one embodiment;

[0032] Figure 4 This is a flowchart illustrating step 301 in one embodiment;

[0033] Figure 5 This is a schematic diagram of an autotransformer filter rectifier circuit in one embodiment;

[0034] Figure 6 This is a schematic diagram of the equivalent magnetic circuit model of the DC excitation circuit in one embodiment;

[0035] Figure 7This is a flowchart illustrating the control method for a bidirectional controllable reactor in another embodiment;

[0036] Figure 8 This is a structural block diagram of the control device for a bidirectional controllable reactor in one embodiment;

[0037] Figure 9 This is a diagram of the internal structure of an electronic device in one embodiment. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0040] In related technologies, controllable saturated reactors not only have the problem of not being able to adjust bidirectionally, but also have the problem of large excitation losses. This is because the excitation magnetic circuit is relatively long. Due to the structure of traditional orthogonal controllable reactors, the excitation magnetic circuit is set on the side yoke of the reactor, which causes the excitation magnetic flux to not be tightly coupled with the main magnetic flux, resulting in large excitation losses.

[0041] To address the two issues mentioned above, this application provides a bidirectional controllable reactor. Unlike reactors in related technologies, this bidirectional controllable reactor features bidirectional adjustable characteristics and low excitation loss. The structure of the bidirectional controllable reactor is described below.

[0042] Explanation of terms used in this application:

[0043] Orthogonal magnetization: refers to the simultaneous application of an axial alternating magnetic field and a circumferential excitation magnetic field (i.e., control magnetic field) in the reactor core, with these two magnetic fields being perpendicular and orthogonal.

[0044] Tensor permeability: It is the permeability of anisotropic magnetic materials in which there is mutual influence between two directions, and it is generally represented by a tensor matrix.

[0045] The bidirectional controllable reactor provided in this application embodiment can be used to design single-phase controllable reactors or to manufacture three-phase AC bidirectional controllable reactors (including three bidirectional controllable reactors). That is, the three-phase iron core columns of the three-phase AC bidirectional controllable reactor are all embedded in the iron core cake at the preset positions. The control current of each phase iron core cake is individually controlled by the adaptive controller (the three phases can be adjusted independently or coordinated). The adaptive controller is used to adjust the inductance of the bidirectional controllable reactor.

[0046] In one exemplary embodiment, such as Figure 1 As shown ( Figure 1 A three-phase AC bidirectional controllable reactor is shown, and a bidirectional controllable reactor is provided, comprising:

[0047] Iron core column 101, on which a working winding (not shown in the figure) is wound, the working winding is used to receive AC voltage and generate an axial magnetic field;

[0048] The iron core disc 102 is circular and is coaxially pressed into a preset position along the axial direction of the iron core column.

[0049] like Figure 2 As shown, the core disc 102 includes core blocks 201 and permanent magnets 202 arranged alternately along the circumferential direction (i.e., the circumferential direction in the xy plane); a control winding (not shown in the figure) is wound on the core disc 102. The control winding is used to receive control current and generate a circumferential control magnetic field. The circumferential control magnetic field and the magnetic field generated by the permanent magnet are superimposed to adjust the inductance of the bidirectional controllable reactor.

[0050] Among them, the iron core column 101 is the main core column, which can be made of stacked silicon steel sheets and is cylindrical or prismatic in shape. Figure 1The diagram shows a cylindrical core column 101 with a working winding (i.e., main winding) wound around it. The two ends of the working winding are connected to an AC power source to receive AC voltage and generate AC current. This AC current generates an axial magnetic field (i.e., main magnetic flux) along the axis of the core column (i.e., the z-axis direction) in the core column 101. In this embodiment, the traditional core disc is cut into multiple parts (2, 4, 6, or 8 even-numbered parts), and each part is fixed by epoxy resin casting. Then, it is interwoven with a corresponding number of permanent magnets and finally cast into a complete cylindrical ring with epoxy resin to obtain the cast core disc 102. After that, multiple turns of copper wire winding are wound inside and outside the cavity (inner hole) of the core disc 102 as a control winding (i.e., DC excitation winding). The core disc equipped with the DC excitation winding is pressed into a preset position on the core column of the controllable reactor. The disc is wound with the corresponding winding, thus forming a bidirectional controllable reactor. The annular iron core disc 102 has the same outer diameter as the iron core column 101. The iron core disc 102 and the iron core column 101 are coaxially arranged, and the iron core disc 102 is pressed into the iron core column 101 at a predetermined position (such as the middle position) along the z-axis. The iron core block 201 is made of a high magnetic permeability material (such as silicon steel sheet), and the permanent magnet 202 is used to generate a constant circumferential magnetic field.

[0051] Optionally, refer to Figure 2 The number of core blocks 201 is the same as the number of permanent magnets 202. There are multiple permanent magnets (e.g., an even number), and these multiple permanent magnets 202 are symmetrically arranged along the circumference of the core disc 102. The ratio of core blocks 201 to permanent magnets 202 can be determined based on the power and adjustment range of the bidirectional controllable reactor; for example, the ratio can be 2:2 or 4:4. Figure 2 The diagram shows two iron core blocks 201 and two permanent magnets 202. The shape of the iron core blocks 201 and the permanent magnets 202 can be the same as or different from each other. Figure 2 The diagram shows that both are fan-shaped.

[0052] For example, by embedding multiple permanent magnets 202 (such as segmented sector-shaped permanent magnets) within the core disc 102 of the reactor, the permanent magnets 202 generate a circumferential permanent magnetic field. This embedded structure provides a path with very low magnetic resistance for the excitation magnetic field. When a DC current is applied to the control winding wound on the core disc 102, a circumferential control magnetic field (i.e., a DC excitation magnetic field) is generated. The circumferential control magnetic field and the permanent magnetic field generated by the permanent magnets are superimposed in the core disc to obtain a total circumferential magnetic field, generating a tensor permeability on the core disc. The permeability of the core is controlled by the tensor permeability, which varies with the total circumferential magnetic field: when the total circumferential magnetic field increases, the axial permeability decreases, and the main inductance decreases; when the total circumferential magnetic field weakens, the axial permeability increases, and the main inductance increases. The strength of the total circumferential magnetic field is achieved by adaptively controlling the control current through an adaptive controller. It can be seen that when the tensor permeability changes, the main inductance of the bidirectional controllable reactor changes accordingly, thus enabling the reactor to have bidirectional adjustment characteristics: its inductance can be increased or decreased.

[0053] Optionally, the control current can be controlled by an adaptive controller. Increasing the control current strengthens the total circumferential magnetic field, reduces the axial permeability of the core disc, and decreases the inductance of the working winding. Conversely, decreasing the control current weakens the total circumferential magnetic field, increases the axial permeability of the core disc, and increases the inductance of the working winding. The specific adjustment direction (increase / decrease) and adjustment amount can be determined according to the application scenario and actual needs of the bidirectional reactor.

[0054] Alternatively, the bidirectional adjustment range of the bidirectional controllable reactor can be increased by increasing the number of coils in the control winding.

[0055] The aforementioned bidirectional controllable reactor includes: a core column with a working winding wound on it, the working winding being used to receive AC voltage and generate an axial magnetic field; a core disc in the shape of a ring, the core disc being coaxially pressed onto a preset position along the axial direction of the core column; the core disc comprising core blocks and permanent magnets alternately arranged along the circumferential direction; and a control winding wound on the core disc, the control winding being used to receive control current and generate a circumferential control magnetic field, the circumferential control magnetic field being superimposed with the magnetic field generated by the permanent magnet to adjust the inductance of the bidirectional controllable reactor. As can be seen, in this bidirectional controllable reactor, the iron core block and permanent magnet are alternately arranged along the circumference to form an iron core disc. By passing a control current through the control winding wound on the iron core disc, a circumferential control magnetic field is generated in the control winding. The circumferential control magnetic field can be changed by changing the control current, thereby changing the total circumferential magnetic field superimposed on the magnetic field of the permanent magnet. By changing the total circumferential magnetic field, the axial permeability of the iron core disc is adjusted, thereby adjusting the inductance of the reactor. This makes the inductance of the working winding decrease as the control current increases and increase as the control current decreases, thus giving the reactor a bidirectional adjustable characteristic.

[0056] It should be noted that, after a detailed comparison and analysis of the theoretical and experimental results of radial core blocks, tile-type core blocks, and involute core blocks, core block 201 was obtained by stacking multiple involute silicon steel sheets. This core block 201 has advantages such as low leakage magnetic loss, relatively low heat generation, and low circumferential magnetic reluctance, and is suitable for use as the AC / DC excitation core of a bidirectional adjustable reactor.

[0057] That is, in one exemplary embodiment, referring to Figure 2 The iron core block 201 is made of multiple involute silicon steel sheets stacked together.

[0058] For example, after the cast iron core cake 102 is obtained, 15 to 20 turns of copper wire are wound inside and outside the cavity (inner hole) of the iron core cake 102 as a control winding (i.e., DC excitation winding). The iron core cake equipped with the DC excitation winding is pressed into the preset position of the iron core column 101 of the controllable reactor, thus forming a solenoid valve with AC and DC hybrid excitation. The surface of the solenoid valve is subjected to an axial AC magnetic field, while the circumferential direction of the solenoid valve is subjected to a DC magnetic field of the control current. Due to the magnetic conductivity of the involute silicon steel, the DC excitation magnetic field excites the silicon steel in the circumferential direction. Moreover, due to the use of involute arrangement, the outer edge of the iron core cake 102 divides the AC leakage flux into tiny loops, thereby greatly reducing the loss caused by AC leakage flux.

[0059] Therefore, in this embodiment, the core block is obtained by stacking multiple involute silicon steel sheets. The involute structure can simultaneously optimize the magnetic circuit characteristics in two orthogonal directions, reduce the overall excitation loss, and thus achieve bidirectional controllable adjustment of the reactor with low loss.

[0060] In one exemplary embodiment, the core disc 102 is located at the midpoint of the core post 101 along its axial direction.

[0061] For example, during setup, a core disc 102 is pressed at the geometric center along the height of the core column 101. The involute core disc 102 with embedded segmented fan-shaped permanent magnets is placed at the very center of the AC magnetic flux (i.e., the axial middle position of the core column), where the axial AC magnetic flux density generated by the working winding is the highest and most uniformly distributed. With the permanent magnet located at the axial center, the circumferential permanent magnetic field it generates can overlap and orthogonalize with the AC magnetic field to the greatest extent in space, resulting in an optimal configuration of the total circumferential magnetic field strength in the core disc region, thereby obtaining the strongest tensor permeability effect. The axial working magnetic field is tightly coupled with the DC magnetic field, significantly enhancing the influence of tensor permeability on axial permeability, thus obtaining a wider inductance adjustment range and higher adjustment sensitivity. At the center of the core column where the AC magnetic flux is most dense, the permeability is expanded according to the following tensor:

[0062]

[0063] Where B1, B2, and B3 represent the components of the magnetic induction intensity in the three directions in Eulerian space, and H1, H2, and H3 represent the components of the magnetic field intensity in the three directions in Eulerian space, μ ij (i,j =1,2,3) represents the relative tensor permeability of the magnetic field strength in the j-th direction to the i-th direction, which varies with the interaction of AC and DC magnetic fields. When superimposed with the permanent magnet magnetic field, it ultimately exhibits bidirectional adjustment characteristics in both positive and negative directions under the control of the adaptive controller.

[0064] Therefore, in this embodiment, the core disc is located at the middle position of the core column axis, which maximizes the tensor permeability effect and ensures the close coupling of the AC magnetic field and the DC magnetic field, thereby obtaining a larger inductance adjustment range and improving the application range of the bidirectional controllable reactor.

[0065] The aforementioned bidirectional controllable reactor can be used for three-phase AC current sharing control, as a tuning inductor in a tuned filter (to adjust the filtering frequency with the capacitor connected in series with the controllable reactor), as an inductive reactive power regulator in reactive power compensation (to adjust the controllable reactor to change the inductive reactive power), and as an arc-suppression inductor in a dynamic arc-suppression coil (to adjust the reactor to change the grounding resistance of the arc-suppression coil), etc., with a very wide range of applications.

[0066] In one exemplary embodiment, refer to Figure 1 A three-phase AC bidirectional controllable reactor is provided, comprising three bidirectional controllable reactors as described in the above embodiments. After a control current is applied to each control winding, the three-phase output current can be effectively shared under the regulation of the adaptive controller, ensuring the balance of the three-phase AC.

[0067] In one exemplary embodiment, a control scheme for a bidirectional controllable reactor is provided, including the bidirectional controllable reactor of the above embodiment and an adaptive controller, wherein the adaptive controller is used to adjust the inductance of the bidirectional controllable reactor. A specific implementation of the adaptive controller is described below.

[0068] In one exemplary embodiment, such as Figure 3 As shown, a control method for a bidirectional controllable reactor is provided. This method is applied to the adaptive controller in the control system of the above embodiment (i.e., Figure 1 The adaptive controller in the process includes the following steps 301 and 302. Wherein:

[0069] Step 301: Determine the target DC control current based on the AC current of the working winding of the bidirectional controllable reactor, the current inductance of the bidirectional controllable reactor, and the target inductance.

[0070] Here, the current inductance is the actual value, and the target inductance is the pre-set expected value / reference value.

[0071] For example, firstly, the AC current of the working winding is acquired in real time. Based on the AC current and AC voltage, the current inductance is calculated, and the deviation between the current inductance and the target inductance is calculated. Then, the AC current is converted (e.g., rectified) according to the deviation to obtain the target DC control current (including direction and magnitude).

[0072] Step 302: Apply a target DC control current to the control winding of the bidirectional controllable reactor to reduce or increase the inductance of the bidirectional controllable reactor.

[0073] For example, after obtaining the target DC control current, the target DC control current is output to the control winding. Through closed-loop regulation, the control current flowing through the control winding follows the target DC control current in real time, thereby changing the circumferential control magnetic field generated by the control winding, so that the inductance of the working winding reaches the target inductance or the deviation between the inductance of the working winding and the target inductance meets the requirements (e.g., less than the preset deviation or equal to 0), thereby realizing the adjustment of the reactor inductance.

[0074] Optionally, when the deviation between the current inductance and the target inductance is less than 0 (i.e., the current inductance is less than the target inductance), the DC current flowing through the control winding is adjusted to reach the target DC control current, thereby weakening the total circumferential magnetic field resulting from the superposition of the circumferential control magnetic field and the magnetic field of the permanent magnet, increasing the inductance of the reactor, and increasing the inductance of the reactor to the target inductance; when the deviation between the current inductance and the target inductance is greater than 0 (i.e., the current inductance is greater than the target inductance), the DC current flowing through the control winding is adjusted to reach the target DC control current, thereby strengthening the total circumferential magnetic field resulting from the superposition of the circumferential control magnetic field and the magnetic field of the permanent magnet, decreasing the inductance of the reactor, and decreasing the inductance of the reactor to the target inductance.

[0075] In the aforementioned control method for a bidirectional controllable reactor, a target DC control current is determined based on the AC current of the working winding, the current inductance of the bidirectional controllable reactor, and the target inductance. The target DC control current is then applied to the control winding of the bidirectional controllable reactor to decrease or increase its inductance. Therefore, the control method of this embodiment adaptively generates and applies a corresponding target DC control current based on the AC current of the working winding, the current inductance, and the target inductance. This allows for both decreasing and increasing the inductance of the bidirectional controllable reactor, achieving bidirectional adjustment of the reactor.

[0076] In an exemplary embodiment, the target DC control current includes a target positive half-cycle DC current and a target negative half-cycle DC current with equal amplitude within one AC cycle. For example... Figure 4As shown, step 301 includes steps 402 and 403. Wherein:

[0077] Step 401: Determine the deviation between the current inductance and the target inductance.

[0078] The difference between the current inductance and the target inductance is the deviation.

[0079] Step 402: Perform controllable rectification on the positive half-cycle current and negative half-cycle current of the AC current according to the deviation, and adjust the firing angle of the controllable rectification according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current.

[0080] For example, the AC current of the working winding is collected, and the positive and negative half-cycle currents of the AC current are controlled rectified separately. During controlled rectification, the sign of the deviation determines whether to increase or decrease the DC amplitude of the controlled rectified output (i.e., the adjustment direction), and the absolute value of the deviation determines the increase or decrease (i.e., the adjustment amount). This is specifically achieved by adjusting the firing angle of the controlled rectifier, thereby obtaining the target positive and negative half-cycle DC currents corresponding to the positive and negative half-cycle currents through controlled rectification. The controlled rectification of the positive and negative half-cycles can be implemented independently.

[0081] In this embodiment, step 302 includes: alternately applying a target positive half-cycle DC current and a target negative half-cycle DC current to the control winding to reduce or increase the inductance of the bidirectional controllable reactor.

[0082] For example, the target positive half-cycle DC current and the target negative half-cycle DC current are applied to the control winding in an alternating manner, that is: during the positive half-cycle of the AC current, the target positive half-cycle DC current is applied to the control winding; during the negative half-cycle, the target negative half-cycle DC current is applied to the control winding.

[0083] Therefore, in this embodiment, the target control current for the positive and negative half-cycles is obtained by rectifying the AC current of the working winding and applied alternately to the control winding, so that the circumferential control magnetic field generated by the control winding has the same amplitude in each AC half-cycle, but the direction changes alternately, and the change in the inductance of the working winding in the positive and negative half-cycles is symmetrical and equal.

[0084] In an exemplary embodiment, step 402 includes: when the deviation is less than 0, performing controllable rectification on the positive half-cycle current and the negative half-cycle current of the AC current respectively, and increasing the firing angle of the controllable rectification according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current; when the deviation is greater than 0, performing controllable rectification on the positive half-cycle current and the negative half-cycle current of the AC current respectively, and decreasing the firing angle of the controllable rectification according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current.

[0085] For example, during the adjustment of the inductance, the adaptive controller monitors the current inductance and calculates the deviation. Based on the deviation, it adjusts the firing angle of the controllable rectifier circuit. The firing angle is positively correlated with the absolute value of the deviation.

[0086] If the deviation is less than 0, the adaptive controller controls the firing angle of the positive half-cycle controllable rectifier circuit and the negative half-cycle controllable rectifier circuit to increase according to the absolute value of the deviation. After the firing angle increases, the conduction interval of the controllable rectifier circuit in each half-cycle is shortened, and the amplitude of the positive half-cycle DC current and the negative half-cycle DC current of the rectified output are reduced accordingly. This achieves the controllable rectification to obtain the target positive half-cycle DC current and the target negative half-cycle DC current, which are alternately applied to the control winding. This weakens the total circumferential magnetic field after the circumferential control magnetic field generated by the control winding is superimposed with the magnetic field of the permanent magnet, increases the axial permeability of the iron core disc, and thus increases the inductance of the working winding until the target inductance is reached.

[0087] If the deviation is greater than 0, the adaptive controller controls the firing angle of the positive half-cycle controllable rectifier circuit and the negative half-cycle controllable rectifier circuit to decrease according to the absolute value of the deviation. After the firing angle decreases, the conduction interval of the controllable rectifier circuit in each half-cycle is extended, and the amplitude of the positive half-cycle DC current and the negative half-cycle DC current of the rectified output are increased accordingly. This achieves the controllable rectification to obtain the target positive half-cycle DC current and the target negative half-cycle DC current, which are alternately applied to the control winding. This enhances the total circumferential magnetic field after the circumferential control magnetic field generated by the control winding is superimposed with the magnetic field of the permanent magnet, reduces the axial permeability of the iron core disc, and thus reduces the inductance of the working winding until the target inductance is reached.

[0088] Optionally, controllable rectification of the positive half-cycle is achieved through an autotransformer filter rectifier circuit during the positive half-cycle, and controllable rectification of the negative half-cycle is achieved through an autotransformer filter rectifier circuit during the negative half-cycle. The autotransformer filter rectifier circuit is as follows: Figure 5 As shown, Figure 5 In the diagram: the highest and lowest DC potential points represent the positive (highest potential) and negative (lowest potential) terminals of the output DC power supply after autotransformer filtering and rectification, respectively. The four blue circles represent the autotransformer induced voltage sources generated by the working winding, arranged in pairs. Specifically, the upper left and lower right circles represent the same polarity induced voltage sources generated during the positive half-cycle, while the upper right and lower left circles represent the same polarity induced voltage sources generated during the negative half-cycle. When the AC current (main current) is in the positive half-cycle, the induced voltage source during the positive half-cycle is filtered and rectified by the left diode into a positive half-wave DC, which is then supplied to the control winding as the control current. This control current "magnetizes" the AC flux during the positive half-cycle. Figure 5The arrows in the diagram indicate the direction of the current, and the red cross indicates that the current does not pass through the diode on the right during the positive half-cycle. Correspondingly, when the AC current (main current) is in the negative half-cycle, another set of autotransformer voltage sources is rectified by the diode on the right to obtain the rectified current for the negative half-cycle, which is supplied to the control winding as the control current. This control current causes the AC flux in the negative half-cycle to be "demagnetized". This increase and decrease result in a complete amplified AC field without DC bias (the amplification factor is controlled by the adaptive controller) in the AC composite field, thus obtaining a controllable reactor with adjustable inductance.

[0089] The equivalent magnetic circuit model of the DC excitation circuit is as follows: Figure 6 As shown, the adaptive controller changes the magnitude and polarity of the DC current by adjusting the firing angle of the controllable rectifier. This current flowing through the control winding generates a magnetomotive force F. d Driven circumferential DC flux Φ d The magnetic reluctance is R when the magnetic core is closed along its circumference. d1 and R d2 Φ d The magnetic flux vector generated by the permanent magnet is superimposed to form a total circumferential magnetic field. This is achieved by controlling the direct current (i.e., F). d The strength of the total circumferential magnetic field can be adjusted, thereby changing the axial permeability of the core disc and ultimately increasing or decreasing the inductance of the working winding.

[0090] Therefore, this embodiment can achieve bidirectional adjustment of the inductance of the bidirectional controllable reactor by increasing or decreasing the rectifier firing angle according to the deviation, thus ensuring the reliability of the bidirectional adjustment.

[0091] The control method of this application embodiment is illustrated below with a specific example.

[0092] like Figure 7 As shown, the control method for a bidirectional controllable reactor includes the following steps:

[0093] Step 701: Collect the AC current and AC voltage of the working winding of the bidirectional controllable reactor;

[0094] Step 702: Calculate the current inductance based on the AC current and AC voltage of the working winding;

[0095] Step 703: Calculate the deviation between the current inductance and the target inductance;

[0096] Step 704: Adjust the firing angle of the autotransformer filter rectifier circuit according to the sign and absolute value of the deviation. Perform autotransformer filter rectification on the positive half-cycle current and negative half-cycle current of the AC current according to the adjusted firing angle to obtain the target positive half-cycle DC current and the target negative half-cycle DC current.

[0097] Step 705: In the positive half-cycle, the DC power supply of the positive half-cycle is introduced into the control winding (excitation winding) to magnetize the AC magnetic flux in the positive half-cycle. In the negative half-cycle, the DC power supply of the negative half-cycle is introduced into the control winding to demagnetize the AC magnetic flux in the negative half-cycle, thereby achieving symmetrical magnetization in the positive and negative half-cycles.

[0098] Step 706: When the deviation meets the requirements (e.g., less than the preset deviation or equal to 0), obtain a stable target inductance.

[0099] Adaptive control logic (taking current sharing in a three-phase converter as an example) can be as follows: The adaptive controller acquires the three-phase current output, calculates the phase difference and amplitude difference of the three phases internally, takes the median value as the reference value, and then calculates the phase difference and amplitude difference between the three phases and the reference value. The difference signal is then subjected to PID calculation, and the calculation result is input to the IGBT switching transistors in the AC rectifier controller to control the corresponding conduction angle to adjust the magnetization and demagnetization amplitudes. Finally, a symmetrical AC waveform is synthesized to achieve control of the total AC current (by alternately applying positive and negative DC currents to the control winding, a symmetrical AC current waveform is generated in the working winding), thus obtaining the required reactance value. In other words, after the AC current of each phase is alternately filtered by positive and negative half-cycles, the resulting half-wave DC is introduced into the control winding to form an adaptive excitation current. This magnetizing current can be controlled according to the phase and amplitude of the AC current of each phase to ensure the balance of the three-phase AC.

[0100] In summary, the embodiments of this application control the circumferential magnetic field of the core disc by utilizing the anisotropic characteristics of the permeability of the silicon steel core, and control the permeability of the core by using tensor permeability; by controlling magnetization and demagnetization, the inductance of the reactor has bidirectional adjustment characteristics, increasing the adjustment range and ensuring the symmetry of the current in the positive and negative half-waves; through the adaptive controller, the three-phase DC excitation current can be adjusted according to the amplitude and phase difference of the three-phase output current, thereby controlling the balance of the three-phase output current.

[0101] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps. It is understood that the steps in different embodiments can be freely combined as needed, and all non-contradictory solutions formed by such combinations are within the scope of protection of this application.

[0102] Based on the same inventive concept, this application also provides a control device for a bidirectional controllable reactor to implement the control method for the bidirectional controllable reactor described above. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the control device for a bidirectional controllable reactor provided below can be found in the limitations of the control method for the bidirectional controllable reactor described above, and will not be repeated here.

[0103] In one exemplary embodiment, such as Figure 8 As shown, a control device for a bidirectional controllable reactor is provided, applied to the adaptive controller in the control system of the above embodiment, including: a determination module 801 and an adjustment module 802. Wherein:

[0104] The determination module 801 is used to determine the target DC control current based on the AC current of the working winding of the bidirectional controllable reactor, the current inductance of the bidirectional controllable reactor, and the target inductance.

[0105] The adjustment module 802 is used to apply the target DC control current to the control winding of the bidirectional controllable reactor to reduce or increase the inductance of the bidirectional controllable reactor.

[0106] In one embodiment, the target DC control current includes a target positive half-cycle DC current and a target negative half-cycle DC current with equal amplitude within an AC cycle.

[0107] The determining module 801 includes:

[0108] The determining unit is used to determine the deviation between the current inductance and the target inductance;

[0109] The rectifier unit is used to controllably rectify the positive half-cycle current and the negative half-cycle current of the AC current according to the deviation, and adjust the firing angle of the controllable rectification according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current.

[0110] The adjustment module 802 is specifically used to: alternately apply the target positive half-cycle DC current and the target negative half-cycle DC current to the control winding.

[0111] In one embodiment, the rectifier unit is specifically configured to: when the deviation is less than 0, perform controllable rectification on the positive half-cycle current and the negative half-cycle current of the AC current respectively, and increase the firing angle of the controllable rectification according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current; when the deviation is greater than 0, perform controllable rectification on the positive half-cycle current and the negative half-cycle current of the AC current respectively, and decrease the firing angle of the controllable rectification according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current.

[0112] Each module in the control device of the aforementioned bidirectional controllable reactor can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0113] In one exemplary embodiment, an electronic device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 9 As shown, this electronic device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores control data for the bidirectional controllable reactor. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a control method for a bidirectional controllable reactor.

[0114] Those skilled in the art will understand that Figure 9 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device to which the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0115] In one exemplary embodiment, an electronic device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement a control method for a bidirectional controllable reactor.

[0116] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements a control method for a bidirectional controllable reactor.

[0117] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements a control method for a bidirectional controllable reactor.

[0118] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0119] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0120] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A bidirectional controllable reactor, characterized in that, include: A core post, on which a working winding is wound, the working winding being used to receive AC voltage and generate an axial magnetic field; The iron core disc is circular in shape and is coaxially pressed onto a predetermined position along the axial direction of the iron core column; the iron core disc includes iron core blocks and permanent magnets alternately arranged along the circumferential direction; A control winding is wound on the iron core disc. The control winding is used to receive control current and generate a circumferential control magnetic field. The circumferential control magnetic field is superimposed with the magnetic field generated by the permanent magnet and used to adjust the inductance of the bidirectional controllable reactor.

2. The bidirectional controllable reactor according to claim 1, characterized in that, The number of iron core blocks is the same as the number of permanent magnets, and there are multiple permanent magnets arranged symmetrically in the circumferential direction of the iron core disc.

3. The bidirectional controllable reactor according to claim 1, characterized in that, The iron core block is made of multiple involute silicon steel sheets stacked together.

4. The bidirectional controllable reactor according to claim 1, characterized in that, The iron core disc is located at the middle position along the axial direction of the iron core column.

5. A three-phase AC bidirectional controllable reactor, characterized in that, include: Three bidirectional controllable reactors as described in any one of claims 1 to 4.

6. A control system for a bidirectional controllable reactor, characterized in that, include: The bidirectional controllable reactor as described in any one of claims 1 to 4; An adaptive controller is used to adjust the inductance of the bidirectional controllable reactor.

7. A control method for a bidirectional controllable reactor, characterized in that, An adaptive controller applied in a control system for a bidirectional controllable reactor as described in claim 6, the method comprising: The target DC control current is determined based on the AC current of the working winding of the bidirectional controllable reactor, the current inductance of the bidirectional controllable reactor, and the target inductance. The target DC control current is applied to the control winding of the bidirectional controllable reactor to reduce or increase the inductance of the bidirectional controllable reactor.

8. The method according to claim 7, characterized in that, The target DC control current includes a target positive half-cycle DC current and a target negative half-cycle DC current with equal amplitude within one AC cycle. The step of determining the target DC control current based on the AC current of the working winding of the bidirectional controllable reactor, the current inductance of the bidirectional controllable reactor, and the target inductance includes: Determine the deviation between the current inductance and the target inductance; The positive and negative half-cycle currents of the AC current are controlled to be rectified according to the deviation, and the firing angle of the controlled rectification is adjusted according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current. Applying the target DC control current to the control winding of the bidirectional controllable reactor includes: The target positive half-cycle DC current and the target negative half-cycle DC current are alternately applied to the control winding.

9. The method according to claim 8, characterized in that, The step of controllingly rectifying the positive and negative half-cycle currents of the AC current according to the deviation, and adjusting the firing angle of the controllable rectification according to the absolute value of the deviation, to obtain the target positive half-cycle DC current and the target negative half-cycle DC current, includes: When the deviation is less than 0, the positive half-cycle current and the negative half-cycle current of the AC current are controlled to be rectified respectively, and the firing angle of the controlled rectification is increased according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current. When the deviation is greater than 0, the positive half-cycle current and the negative half-cycle current of the AC current are controlled to be rectified respectively, and the firing angle of the controlled rectification is reduced according to the absolute value of the deviation to obtain the target positive half-cycle DC current and the target negative half-cycle DC current.

10. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 7 to 9.

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