Direct-current control power supply for magnetically-controlled on-load tap-changing transformer and control method of direct-current control power supply

Abstract

The invention belongs to the technical field of power systems, and discloses a direct-current control power supply for a magnetic control on-load tap changing transformer and a control method thereof, and the system comprises a control driving module which is used for calculating the current working state of the magnetic control on-load tap changing transformer; the voltage adder generation module is used for adjusting the amplitude of the output current; the Buck converter conversion module is used for adjusting the magnitude of the current; the continuous adjustable single-phase direct current wave output module is used for driving the output of single-phase direct current until a target voltage value is reached; the multi-mode sensor is used for monitoring the iron core magnetic flux density, the iron core temperature and the system voltage regulation rate of the primary side and the secondary side in the magnetic control on-load voltage regulation transformer in real time; and the output sampling module is used for acquiring the working state of each node of the magnetically-controlled on-load tap-changing transformer. According to the invention, the adaptive capacity of the magnetically controlled voltage regulating transformer in a complex load and power grid environment can be monitored and flexibly regulated in real time, and higher regulation precision and higher response speed are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a direct current control power supply for a magnetically controlled on-load voltage-regulating transformer and a control method thereof. Background Art

[0002] The control circuit of the magnetically controlled on-load voltage-regulating transformer plays a vital role in the power system. Its technical core is to control the magnetic permeability of the magnetic core by adjusting the excitation current, thereby achieving stepless voltage regulation. This technology has significant advantages in improving power quality and system stability. However, the existing control circuit of the magnetically controlled voltage-regulating transformer still has some defects and deficiencies that need to be solved. First, most traditional voltage regulators use mechanical switches or electronic components for voltage regulation, which leads to problems such as slow response speed and low regulation accuracy. Mechanical components are easy to wear and have low reliability, while electronic components are susceptible to electromagnetic interference, affecting the stable operation of the system. Secondly, the nonlinear characteristics and hysteresis effects of magnetic materials further aggravate the problem of insufficient regulation accuracy and stability of the control circuit, making it difficult to meet the needs of modern power systems for high-precision voltage regulation. In addition, the control algorithm adopted by the traditional control circuit performs well under simple load conditions, but its performance is often unsatisfactory when facing complex and changeable load environments and rapidly changing grid conditions. Traditional control circuits are difficult to adapt to instantaneous changes and nonlinear loads, resulting in problems such as hysteresis in regulation response and system oscillation, which limits their application in dynamic voltage regulation.

[0003] Therefore, how to provide a DC control power supply and a control method thereof for a magnetically controlled on-load voltage-changing transformer is a problem that needs to be solved urgently. Summary of the invention

[0004] The embodiment of the present invention provides a direct current control power supply for a magnetically controlled on-load voltage-regulating transformer and a control method thereof to solve the above-mentioned technical problems in the prior art.

[0005] In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be a general review, nor is it intended to identify key / important components or to delineate the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

[0006] According to a first aspect of an embodiment of the present invention, a DC control power supply for a magnetically controlled on-load voltage-changing transformer is provided.

[0007] In one embodiment, the DC control power supply for the magnetically controlled on-load voltage-changing transformer comprises:

[0008] A control drive module is used to calculate the current working state of the magnetically controlled on-load voltage-regulating transformer based on the core magnetic flux density, the core temperature and the system voltage regulation rate, and generate a corresponding drive control signal;

[0009] A voltage superimposed generator module is used to adjust the amplitude of the output current by voltage superposition according to the driving control signal;

[0010] Buck converter conversion module, used to adjust the current size by controlling the switch driving frequency according to the driving control signal;

[0011] A continuously adjustable single-phase DC current wave output module is used to drive the output of the single-phase DC current according to the adjusted current until the target voltage value is reached;

[0012] Multi-mode sensor, used for real-time monitoring of the core flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load voltage-regulating transformer;

[0013] The output sampling module is used to obtain the working status of each node of the magnetically controlled on-load tap-changing transformer.

[0014] In one embodiment, the voltage superimposer generating module is composed of a plurality of voltage superimposer sub-modules, wherein the voltage superimposer sub-module includes an energy storage unit Vn, a semiconductor switch SLn, a freewheeling diode DHn and a freewheeling diode Dn, and the energy storage unit Vn is connected in series with the freewheeling diode Dn, and the semiconductor switch SLn is connected in parallel with the freewheeling diode DHn.

[0015] In one embodiment, the number of turned-on voltage superimposer submodules in the voltage superimposer generating module is proportional to the output current of the system.

[0016] In one embodiment, the first-stage and last-stage sub-modules of the voltage superimposer sub-module are connected to the Buck converter conversion module.

[0017] In one embodiment, the Buck converter conversion module includes a semiconductor switch S1, an inductor element LL and a capacitor element CL, wherein the semiconductor switch S1 is connected in series with the inductor element LL, and the capacitor element CL is connected in parallel with the inductor element LL.

[0018] In one embodiment, the semiconductor switch comprises any one of an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor or a gas insulated switch.

[0019] In one embodiment, when the voltage superimposed generator module is charging, the semiconductor switch SLn of each voltage superimposed submodule is in the off state, and the low-voltage DC control power supply charges the energy storage unit Vn in parallel through the freewheeling diode DHn, the freewheeling diode Dn, and the current limiting resistor.

[0020] In one embodiment, when the voltage superimposer generating module is discharging, the semiconductor switch SLn is in the on state by applying corresponding switch drive to each voltage superimposer sub-module. At this time, the energy storage unit Vn is connected in series through the semiconductor switch SLn, the output voltage is positive, and the output amplitude is the sum of the voltages of n energy storage units Vn, and is isolated and protected by the freewheeling diode DHn before the converter is activated.

[0021] In one embodiment, when the Buck converter conversion module is discharging, the semiconductor switch S1 is turned on by applying corresponding switch drive to the Buck converter. At this time, the energy storage unit Vn outputs a positive polarity voltage in series through the semiconductor switch SLn, and the corresponding output current is filtered by the converter inductor and stored in the capacitor to supply DC current to the load.

[0022] According to a second aspect of an embodiment of the present invention, a control method for a DC control power supply of a magnetically controlled on-load tap-changing transformer is provided.

[0023] In one embodiment, the control method of the DC control power supply for the magnetically controlled on-load voltage-changing transformer includes:

[0024] Obtain the initial core flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load voltage-regulating transformer to determine the current working state of the voltage regulator;

[0025] Based on the satisfaction of the target voltage regulation rate, the closed-loop control strategy is used to calculate the excitation output current that needs to be adjusted, and the current size is dynamically controlled by adjusting the control power switch action sequence;

[0026] The real-time core flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load voltage-changing transformer are obtained. According to the comparison result between the output voltage and the target voltage value, the output voltage is adjusted in real time until the target voltage value is reached.

[0027] In one embodiment, before obtaining the initial core flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load tap-changing transformer, the method also includes: initializing the system and sensors, and performing self-inspection on the sensors and the magnetically controlled on-load tap-changing transformer body, and setting initial parameters and reference values.

[0028] In one embodiment, obtaining the initial core magnetic flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load voltage regulating transformer and determining the current working state of the voltage regulator includes:

[0029] The initial core flux density and core temperature of the primary and secondary sides of the magnetically controlled on-load voltage-regulating transformer are obtained, and the system voltage regulation rate is calculated according to the ratio of the input-output voltage difference to the input voltage to determine the current working state of the voltage regulator.

[0030] In one embodiment, the calculation of the required adjustment of the excitation output current by using a closed-loop control strategy based on the satisfaction of the target voltage regulation rate includes:

[0031] Measure and calculate the voltage regulation ratio of the voltage regulating transformer:

[0032]

[0033] Where, VRG c is the voltage regulation rate, V out is the output voltage of the current voltage regulating transformer, V ref is the target voltage;

[0034] Calculate the error based on the current voltage regulation rate and use proportional-integral control to adjust the system;

[0035] The error calculation formula is:

[0036] e(t)=VRG c -VRG t

[0037] The control formula is:

[0038]

[0039] Where e(t) is the error, VRG t is the target voltage regulation rate, I1 is the excitation output current; K p is the proportional gain, K i is the integral gain, t is the time, and e(τ) is the error at different time scales from 0 to t;

[0040] The system is controlled according to the calculation results to adjust the current excitation output current.

[0041] In one embodiment, dynamically controlling the current by adjusting the power switch action sequence includes:

[0042] By adjusting and controlling the power switch driving signal, the voltage superimposed discharge mode and the Buck converter discharge mode can be selected and switched;

[0043] Among them, the voltage superimposed discharge mode adjusts the amplitude of the output current by voltage superposition; the Buck converter discharge mode changes the current size by controlling the switch driving frequency.

[0044] In one embodiment, adjusting the output voltage in real time until the target voltage value is reached according to the comparison result between the output voltage and the target voltage value comprises:

[0045] Determine whether the output voltage reaches the target voltage value. If so, maintain the current working state and obtain various sensor data regularly. If not, return to the re-excitation output current calculation step until the output voltage reaches the target voltage value.

[0046] In one embodiment, while maintaining the current working state and periodically acquiring various sensor data, if an abnormal state exists, the excitation output current calculation step is returned again until the output voltage reaches the target voltage value.

[0047] According to a third aspect of an embodiment of the present invention, a computer device is provided.

[0048] In some embodiments, the computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0049] According to a fourth aspect of embodiments of the present invention, a computer-readable storage medium is provided.

[0050] In one embodiment, the computer-readable storage medium stores a computer program, and the computer program implements the steps of the above method when executed by a processor.

[0051] The technical solution provided by the embodiment of the present invention may have the following beneficial effects:

[0052] The present invention has a highly flexible current regulation function through a cascade combination of a voltage superimposed generator module and a Buck converter conversion module, combined with a closed-loop control algorithm and a unique switch timing working mode, and provides a more sensitive control mode for a magnetically controlled continuous on-load voltage-regulating transformer. The adaptability of the magnetically controlled voltage-regulating transformer in complex load and power grid environments can be monitored and flexibly regulated in real time, achieving higher regulation accuracy and faster response speed. In addition, the present invention can also provide a solid theoretical basis and technical support for the widespread application of a new magnetically controlled voltage-regulating transformer control circuit.

[0053] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0055] Figure 1is a structural block diagram of a DC control power supply for a magnetically controlled on-load voltage-changing transformer according to an exemplary embodiment;

[0056] Figure 2 is a flow chart showing a method for controlling a DC control power supply for a magnetically controlled on-load voltage-changing transformer according to an exemplary embodiment;

[0057] Figure 3 is a schematic diagram showing a principle of a DC control power supply for a magnetically controlled on-load voltage-changing transformer according to an exemplary embodiment;

[0058] Figure 4 is a closed-loop control structure diagram according to an exemplary embodiment;

[0059] Figure 5 is a flow chart of a control power regulation algorithm according to an exemplary embodiment;

[0060] Figure 6 is a schematic diagram of a DC control power supply topology structure according to an exemplary embodiment;

[0061] Figure 7 is a schematic diagram showing a charging mode of a voltage superimposer according to an exemplary embodiment;

[0062] Figure 8 is a schematic diagram showing a discharge mode of a voltage superimposer according to an exemplary embodiment;

[0063] Fig. 9 is a schematic diagram of a Buck converter discharge mode according to an exemplary embodiment;

[0064] Fig.10 is a schematic diagram of a control power supply for a magnetically controlled on-load voltage-changing transformer according to an exemplary embodiment;

[0065] Fig.11 is an output waveform diagram of a control power supply in two regulation modes according to an exemplary embodiment;

[0066] Fig.12 The figure is a schematic diagram showing the structure of a computer device according to an exemplary embodiment. DETAILED DESCRIPTION

[0067] The following description and accompanying drawings fully illustrate the specific embodiments of this article so that those skilled in the art can practice them. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of this article includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, the terms "first", "second", etc. are only used to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the structure, device or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such structure, device or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the structure, device or equipment including the elements. Each embodiment is described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0068] The terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. in this document indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this document and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of this document, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, it can also be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0069] As used herein, the term "plurality" means two or more than two, unless otherwise specified.

[0070] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0071] In this article, the term "and / or" is a description of the association relationship between objects, indicating that three relationships may exist. For example, A and / or B means: A or B, or, A and B.

[0072] It should be understood that, although the various steps in the flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0073] Each module in the device or system of the present application can be implemented in whole or in part by software, hardware, or a combination thereof. The above modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to the above modules.

[0074] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0075] Figure 1 An embodiment of a DC control power supply for a magnetically controlled on-load voltage-regulating transformer according to the present invention is shown.

[0076] In this optional embodiment, the DC control power supply for the magnetically controlled on-load voltage-changing transformer includes:

[0077] The control driving module 101 is used to calculate the current working state of the magnetically controlled on-load voltage regulating transformer based on the core magnetic flux density, the core temperature and the system voltage regulation rate, and generate a corresponding driving control signal;

[0078] A voltage superimposed generator module 103 is used to adjust the amplitude of the output current by voltage superimposition according to the driving control signal;

[0079] Buck converter conversion module 105, used to adjust the current magnitude by controlling the switch driving frequency according to the driving control signal;

[0080] A continuously adjustable single-phase DC current wave output module 107, used to drive the output of the single-phase DC current according to the adjusted current until the target voltage value is reached;

[0081] The multi-mode sensor 109 is used to monitor the core magnetic flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load voltage regulating transformer in real time;

[0082] The output sampling module 111 is used to obtain the working status of each node of the magnetically controlled on-load tap-changing transformer.

[0083] Figure 2 An embodiment of a method for controlling a DC control power supply for a magnetically controlled on-load voltage-regulating transformer according to the present invention is shown.

[0084] In this optional embodiment, the control method of the DC control power supply for the magnetically controlled on-load voltage-changing transformer includes:

[0085] Step S201, obtaining the initial core magnetic flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load voltage regulating transformer, and determining the current working state of the voltage regulator;

[0086] Step S203, based on the satisfaction of the target voltage regulation rate, the closed-loop control strategy is used to calculate the excitation output current that needs to be adjusted, and the current size is dynamically controlled by adjusting the power switch action sequence;

[0087] Step S205, obtaining the real-time core flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load voltage-regulating transformer, and adjusting the output voltage in real time according to the comparison result between the output voltage and the target voltage value until the target voltage value is reached.

[0088] In order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are further described below from the perspective of architecture and principle, as follows:

[0089] The principle of the DC control power supply for the magnetically controlled on-load voltage-regulating transformer of the present invention is as follows: Figure 3 As shown, it includes a control drive module, a voltage superimposed generator module, a Buck converter conversion module, a continuously adjustable single-phase DC current wave output module, a multi-mode sensor and an output sampling module. The output sampling module and the sensor read the working status of each node in the current system. The control drive module is responsible for analyzing whether the current working status needs to be adjusted. If adjustment is required, the output of the single-phase DC current is driven by the voltage superimposed generator module and the Buck converter conversion module to adjust the system output voltage to the target voltage value.

[0090] Figure 4 is the entire closed-loop control structure of the system, where V ref Indicates the target voltage, V in is the input voltage of the voltage regulator, V out is the output voltage of the voltage regulator, I DC To control the DC current output by the power supply. The entire magnetic control voltage regulator can be divided into two parts: a transformer and a controller. The present invention is mainly designed for the controller, where the input variables of the controller include the target voltage value V ref 、Actual output voltage V outAccording to the above input variables, the output current of the control power supply is adjusted to bias the magnetic field of the magnetic core in the magnetically controlled on-load voltage-changing transformer, and finally achieve the voltage regulation effect.

[0091] In order to ensure the stability and efficiency of the system under different working conditions, the control power supply is combined with a precise control process to adjust the working state of the magnetically controlled on-load voltage-changing transformer. The specific control method steps are as follows Figure 5 shown.

[0092] Next, the built-in algorithm flow for controlling the power supply is described:

[0093] Step 1: System initialization: the control unit performs self-inspection on the sensor and the magnetically controlled on-load tap-changing transformer body, and sets initial parameters and reference values.

[0094] Step 2: After the system is initialized, the sensor starts to read the magnetic flux density and core temperature of the primary and secondary cores, and calculates the system voltage regulation rate based on the ratio of the input-output voltage difference to the input voltage to determine the current working status of the voltage regulator.

[0095] Step 3: Based on the specific requirements (i.e., whether the target voltage regulation rate is met), the control algorithm is used to calculate the excitation output current that needs to be adjusted. The control algorithm uses a closed-loop control strategy (such as fuzzy control, neural network control, etc.) to determine the excitation output current that needs to be adjusted. The current size can be flexibly controlled by adjusting the control power switch action sequence, such as Figure 8-Figure 9 shown.

[0096] Specifically, based on specific requirements (whether the target voltage regulation rate is met), the closed-loop control strategy is used to calculate the excitation output current that needs to be adjusted, including:

[0097] Different types of control algorithms can be used in practical applications. Here, PI control is taken as an example.

[0098] First measure and calculate the voltage regulation rate of the voltage regulating transformer:

[0099]

[0100] Among them, VRG c is the voltage regulation rate, V out is the output voltage of the current voltage regulating transformer, V ref is the target voltage, VRG t is the target voltage regulation rate. Calculate the error based on the current voltage regulation rate:

[0101] e(t)=VRG c -VRG t

[0102] Proportional integral control (PI control) is used for system regulation, and the control formula is as follows:

[0103]

[0104] Where I1 is the excitation output current; K p is the proportional gain, which is used to adjust the response strength of the excitation output current to the error; K i is the integral gain, which is used to accumulate historical errors and eliminate long-term steady-state errors. t is time, and e(τ) is the error at different time scales from 0 to t.

[0105] When the system detects that the current voltage regulation rate is not equal to the target voltage regulation rate, that is, when e(t) is not 0, the system controls and adjusts the current excitation current. When e(t) is 0, the system does not adjust and control. During the adjustment process, when the current output voltage is less than the target voltage, e(t) is less than 0, then it is necessary to reduce the excitation output current and increase the voltage regulation rate of the magnetically controlled on-load voltage-changing transformer, thereby increasing the output voltage. Conversely, when the current output voltage is greater than the target voltage, e(t) is greater than 0, then it is necessary to increase the excitation output current and reduce the voltage regulation rate of the magnetically controlled on-load voltage-changing transformer, thereby reducing the output voltage.

[0106] Step 4: The sensor reads the magnetic flux density and core temperature of the original secondary core, and checks the system voltage regulation rate based on the ratio of the output voltage to the input voltage. If the judgment result does not meet the standard, the control algorithm calculation step is entered to calculate the required adjustment of the excitation current again, and the sensor samples and reads the judgment value further until the output voltage reaches the target voltage value. The system enters the maintenance state to continuously monitor and cache the sensor data for subsequent optimization.

[0107] Step 5: Maintain the current working state, perform system self-checks regularly, and obtain the working state of each node in the system. If it is detected that the output voltage has not reached the target voltage value or the system is in an abnormal state at this time, return to step 3 to adjust the system, otherwise maintain the current working state.

[0108] In the present invention, the DC control power supply topology is as follows Figure 6 As shown, it includes a voltage superimposed generator module ( Figure 6 The dotted box) and the Buck converter conversion module ( Figure 6 The power supply is connected in parallel with each submodule of the voltage superimposer, and the first and last submodules of the voltage superimposer are connected to the Buck circuit. The voltage superimposer includes an energy storage module unit Vn, a semiconductor switch SLn and freewheeling diodes DHn and Dn; the Buck converter conversion module includes a semiconductor switch S1, an inductor element LL, and a capacitor element CL.

[0109] Figure 7 It is the voltage superimposed device charging mode: each submodule semiconductor switch SLn is in the off state, and the discharge power supply Vn is charged in parallel by the low-voltage DC control power supply through the low-voltage submodule diodes DHn, Dn, and the current limiting resistor Rs.

[0110] Figure 8 It is the voltage superimposed discharge mode: by applying the corresponding switch drive to each sub-module of the voltage superimposed device, the semiconductor switch SLn is in the on state. At this time, the discharge power supply Vn is connected in series through the switch SLn, the output voltage is positive, and the output amplitude is equal to the sum of the voltages of n discharge power supplies Vn. It is isolated and protected by DHn before the converter is activated.

[0111] Fig. 9 This is the discharge mode of the Buck converter: by applying the corresponding switch drive to the Buck converter, the semiconductor switch S1 is in the on state. At this time, the discharge power supply Vn outputs a positive polarity voltage in series through the switch SLn, and the corresponding output current is filtered by the converter inductor and stored in the capacitor, thereby supplying DC current to the load.

[0112] In addition, the switches used in the control circuit of the control power supply of the present invention may include but are not limited to fully controlled semiconductor switches such as IGBT (insulated gate bipolar transistor) and MOSFET (metal oxide semiconductor field effect transistor). The closed-loop control strategy adopted by the system may include but is not limited to PID control, fuzzy control, neural network control, etc. The input feedback parameters of the data and control algorithm based on real-time monitoring of the sensor may include but are not limited to the magnetic flux density of the primary and secondary iron cores, the core temperature, the ratio of the output voltage to the input voltage, etc. The control circuit can also be used to read and control the feedback parameters of other magnetically controlled on-load voltage-changing transformers.

[0113] The key technical points of the present invention are as follows:

[0114] 1) DC control power supply circuit structure design: The DC control power supply circuit mainly includes two modules. Through the cascade combination of the voltage superimposed generator module and the Buck converter conversion module, it has a highly flexible current control function, providing a richer and more sensitive control mode for the magnetically controlled continuous on-load tap-changing transformer, and providing hardware support for the subsequent closed-loop control algorithm.

[0115] 2) Closed-loop control strategy for magnetically controlled voltage-regulating transformer: The system adopts a closed-loop control strategy (such as fuzzy control, neural network control, etc.) and calculates based on the data monitored in real time by sensors (such as the magnetic flux density of the primary and secondary cores, the core temperature, the ratio of the input-output voltage difference to the input voltage), determines the excitation output current that needs to be adjusted, and adjusts the excitation current in real time according to changes in the load and grid environment to ensure the stability and efficiency of the system. Protect the closed-loop control algorithm used in the system, especially the specific algorithm optimization and adjustment methods for magnetically controlled voltage-regulating transformers, as well as the specific methods and implementation processes for system initialization, self-test, setting initial parameters and reference values. Protect the specific methods of real-time monitoring of the magnetic flux density, core temperature and voltage regulation rate of the primary and secondary cores through sensors.

[0116] 3) Switch drive timing: The control circuit proposed in the present invention has a unique switch drive timing, which is suitable for the cascade structure of the voltage superimposed generator module and the Buck converter conversion module. It can realize precise control of the circuit state, thereby outputting amplitude-controllable DC current, and improving the regulation accuracy and response speed of the system.

[0117] In specific applications, the control power supply proposed by the present invention can be applied to any field that requires DC current regulation. In the magnetically controlled on-load voltage-regulating transformer used in this implementation case, it acts as a voltage regulator control module. Fig.10 In the dotted box.

[0118] Fig.11 The output waveform of the control power supply in two control modes, SLn is the switch action signal, i OUT The corresponding output current waveform. According to the actual situation, turn on the corresponding number of voltage superimposed modules. The output current of the system is proportional to the number of voltage superimposed modules turned on. The output voltage expression is as follows:

[0119] V OUT =V1+V2+…+Vn

[0120] Where V OUT represents the output voltage, V1, V2, ... Vn represent the output voltages of the first voltage superimposer module, the second voltage superimposer module, ... the nth voltage superimposer module respectively;

[0121] Fig.11Take three voltage adder modules as an example. In the left figure (1), the S1 switch is in the on state for a long period. At this time, the voltage across the load is accumulated by the turned-on voltage adders, and the load current increases with the increase in the number of turned-on voltage adders. When S1 is turned off, the system no longer transmits electrical signals to the load side. In the right figure (2), the voltage adders SL1-SL3 are all turned on. At this time, S1 is controlled by PWM wave, and the load current changes with the change of PWM wave. Both of the above methods can control the output current.

[0122] The control power supply is always in the voltage superimposed charging mode before it starts working. The sensor first reads the magnetic flux density and core temperature of the primary and secondary cores, and calculates the system voltage regulation rate based on the ratio of the input-output voltage difference to the input voltage. Based on the satisfaction of the target voltage regulation rate, the control algorithm is used to calculate the excitation output current that needs to be adjusted. The control algorithm uses a closed-loop control strategy (such as fuzzy control, neural network control, etc.) to determine the excitation output current that needs to be adjusted. The current size can be flexibly controlled by adjusting the control power switch action sequence. For the specific principle, please refer to Figure 4 and Figure 5 Control closed-loop algorithm process. The sensor reads the original secondary core magnetic flux density and core temperature again, and checks the system voltage regulation rate according to the ratio of the input-output voltage difference to the input voltage. If the judgment result does not meet the standard, the control algorithm calculation step is entered to calculate the required adjustment of the excitation current again. By adjusting the control power switch drive signal, the selection and switching of the voltage superimposed discharge mode and the Buck converter discharge mode can be realized. Among them, the voltage superimposed discharge mode can quickly adjust the amplitude of the output current through voltage superposition, and the Buck converter discharge mode can control the change of the current size of the switch drive frequency. Further, the control power supply can output an excitation DC current to supply the excitation winding of the magnetically controlled on-load voltage-regulating transformer used in this embodiment, thereby changing the magnetic flux density and the system voltage regulation effect. Further, the sensor samples and reads the judgment value until the voltage regulation target is reached, and the system enters a maintenance state to continuously monitor and cache the sensor data for subsequent optimization.

[0123] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Fig.12As shown. The computer device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store static information and dynamic information data. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the steps in the above method embodiment are implemented.

[0124] Those skilled in the art will understand that Fig.12 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0125] In addition, the present invention also provides a computer device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiment when executing the computer program.

[0126] In addition, the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiment are implemented.

[0127] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0128] The present invention is not limited to the structures which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A DC control power supply for a magnetically controlled on-load voltage-changing transformer, characterized in that: include: A control drive module is used to calculate the current working state of the magnetically controlled on-load voltage-regulating transformer based on the core magnetic flux density, the core temperature and the system voltage regulation rate, and generate a corresponding drive control signal; A voltage superimposed generator module is used to adjust the amplitude of the output current by voltage superposition according to the driving control signal; Buck converter conversion module, used to adjust the current size by controlling the switch driving frequency according to the driving control signal; A continuously adjustable single-phase DC current wave output module is used to drive the output of the single-phase DC current according to the adjusted current until the target voltage value is reached; Multi-mode sensor, used for real-time monitoring of the core flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load voltage-regulating transformer; The output sampling module is used to obtain the working status of each node of the magnetically controlled on-load tap-changing transformer.

2. The DC control power supply for a magnetically controlled on-load voltage-changing transformer according to claim 1, characterized in that: The voltage superimposer generating module is composed of a plurality of voltage superimposer sub-modules, wherein the voltage superimposer sub-module includes an energy storage unit Vn, a semiconductor switch SLn, a freewheeling diode DHn and a freewheeling diode Dn, and the energy storage unit Vn is connected in series with the freewheeling diode Dn, and the semiconductor switch SLn is connected in parallel with the freewheeling diode DHn.

3. The DC control power supply for the magnetically controlled on-load voltage-changing transformer according to claim 2, characterized in that: The number of turned-on voltage superimposer submodules in the voltage superimposer generating module is proportional to the output current of the system.

4. The DC control power supply for a magnetically controlled on-load voltage-changing transformer according to claim 2, characterized in that: The first-stage and last-stage submodules of the voltage superimposer submodule are connected to the Buck converter conversion module.

5. The DC control power supply for a magnetically controlled on-load voltage-changing transformer according to claim 2, characterized in that: The Buck converter conversion module includes a semiconductor switch S1, an inductor element LL and a capacitor element CL, wherein the semiconductor switch S1 is connected in series with the inductor element LL, and the capacitor element CL is connected in parallel with the inductor element LL.

6. The DC control power supply for a magnetically controlled on-load voltage-changing transformer according to claim 4, characterized in that: The semiconductor switch includes any one of an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor or a gas insulated switch.

7. The DC control power supply for a magnetically controlled on-load voltage-changing transformer according to claim 2, characterized in that: When the voltage superimposed generator module is charging, the semiconductor switch SLn of each voltage superimposed submodule is in the off state, and the low-voltage DC control power supply charges the energy storage unit Vn in parallel through the freewheeling diode DHn, the freewheeling diode Dn, and the current limiting resistor.

8. The DC control power supply for a magnetically controlled on-load voltage-changing transformer according to claim 2, characterized in that: When the voltage superimposed generator module is discharging, the semiconductor switch SLn is turned on by applying corresponding switch drive to each voltage superimposed generator submodule. At this time, the energy storage unit Vn is connected in series through the semiconductor switch SLn, the output voltage is positive, and the output amplitude is the sum of the voltages of n energy storage units Vn. It is isolated and protected by the freewheeling diode DHn before the converter is activated.

9. The DC control power supply for a magnetically controlled on-load voltage-changing transformer according to claim 5, characterized in that: When the Buck converter conversion module is discharging, the semiconductor switch S1 is turned on by applying corresponding switch drive to the Buck converter. At this time, the energy storage unit Vn outputs a positive polarity voltage in series through the semiconductor switch SLn, and the corresponding output current is filtered by the converter inductor and stored in the capacitor to supply DC current to the load.

10. A method for controlling a DC control power supply for a magnetically controlled on-load voltage-changing transformer, characterized in that: include: Obtain the initial core flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load voltage-regulating transformer to determine the current working state of the voltage regulator; Based on the satisfaction of the target voltage regulation rate, the closed-loop control strategy is used to calculate the excitation output current that needs to be adjusted, and the current size is dynamically controlled by adjusting the control power switch action sequence; The real-time core flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load voltage-changing transformer are obtained. According to the comparison result between the output voltage and the target voltage value, the output voltage is adjusted in real time until the target voltage value is reached.

11. The control method of the DC control power supply for the magnetically controlled on-load voltage-changing transformer according to claim 10, characterized in that: Before obtaining the initial core flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load tap-changing transformer, the method also includes: initializing the system and the sensor, performing self-inspection on the sensor and the magnetically controlled on-load tap-changing transformer body, and setting initial parameters and reference values.

12. The control method of the DC control power supply for the magnetically controlled on-load voltage-changing transformer according to claim 10, characterized in that: The obtaining of the initial core magnetic flux density, core temperature and system voltage regulation rate of the primary and secondary sides of the magnetically controlled on-load voltage regulating transformer and determining the current working state of the voltage regulator includes: The initial core flux density and core temperature of the primary and secondary sides of the magnetically controlled on-load voltage-regulating transformer are obtained, and the system voltage regulation rate is calculated according to the ratio of the input-output voltage difference to the input voltage to determine the current working state of the voltage regulator.

13. The control method of the DC control power supply for the magnetically controlled on-load voltage-changing transformer according to claim 10, characterized in that: The method of calculating the excitation output current to be adjusted based on the satisfaction of the target voltage regulation rate by using a closed-loop control strategy includes: Measure and calculate the voltage regulation ratio of the voltage regulating transformer: Where, VRG c is the voltage regulation rate, V out is the output voltage of the current voltage regulating transformer, V ref is the target voltage; Calculate the error based on the current voltage regulation rate and use proportional-integral control to adjust the system; The error calculation formula is: e(t)=VRG c -VRG t The control formula is: Where e(t) is the error, VRG t is the target voltage regulation rate, I1 is the excitation output current; K p is the proportional gain, K i is the integral gain, t is the time, and e(τ) is the error at different time scales from 0 to t; The system is controlled according to the calculation results to adjust the current excitation output current.

14. The control method of the DC control power supply for the magnetically controlled on-load voltage-changing transformer according to claim 10, characterized in that: The dynamically controlling the current magnitude by adjusting the power switch action sequence comprises: By adjusting and controlling the power switch driving signal, the voltage superimposed discharge mode and the Buck converter discharge mode can be selected and switched; Among them, the voltage superimposed discharge mode adjusts the amplitude of the output current by voltage superposition; the Buck converter discharge mode changes the current size by controlling the switch driving frequency.

15. The control method of the DC control power supply for the magnetically controlled on-load voltage-changing transformer according to claim 10, characterized in that: The step of adjusting the output voltage in real time until the target voltage value is reached according to the comparison result between the output voltage and the target voltage value comprises: Determine whether the output voltage reaches the target voltage value. If so, maintain the current working state and obtain various sensor data regularly. If not, return to the re-excitation output current calculation step until the output voltage reaches the target voltage value.

16. The control method of the DC control power supply for the magnetically controlled on-load voltage-changing transformer according to claim 15, characterized in that: While maintaining the current working state and obtaining various sensor data at regular intervals, if an abnormal state exists, the excitation output current calculation step is returned again until the output voltage reaches the target voltage value.

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