Energy storage oscillation demagnetization method and energy storage oscillation demagnetization circuit for transformer

Abstract

The present disclosure provides an energy storage oscillation demagnetization method and an energy storage oscillation demagnetization circuit for a transformer, which can be applied to the field of transformer technology. The energy storage oscillation demagnetization method for a transformer includes: obtaining capacitor screening information according to capacitance parameters of multiple candidate capacitors, a first parameter in the rated current parameters of the transformer, and a core magnetizing inductance parameter of the transformer; determining an energy storage capacitor with a target capacitance parameter from the multiple candidate capacitors according to capacitance parameters of the multiple candidate capacitors, a second parameter in the rated current parameters, and the capacitance screening information; and electrically connecting the energy storage capacitor to the transformer so as to provide an oscillation voltage to the transformer through the energy storage capacitor to demagnetize the core of the transformer.

Description

Technical Field

[0001] The present disclosure relates to the technical field of transformers, and in particular to an energy storage oscillation demagnetization method and an energy storage oscillation demagnetization circuit for a transformer. Background Art

[0002] As the core equipment of the power system, the power transformer plays a key role in connecting power grids of different voltage levels. Its stability is crucial to the safe operation of the power system. Due to the hysteresis saturation characteristics of the transformer core material, residual magnetism will be generated in the core of the transformer after a DC resistance test or power failure. When residual magnetism exists, the transformer may cause core saturation and generate excitation inrush current when it is connected to the grid without load, and its amplitude is usually 6 to 8 times the rated current. The excitation inrush current will shorten the expected service life of the transformer and affect the normal operation of the power grid system. Therefore, before testing or closing the transformer, the residual magnetism of the transformer needs to be effectively eliminated to ensure that the transformer core is in a state without residual magnetism.

[0003] In actual engineering, alternating excitation is mainly used to drive the hysteresis loop of the transformer to gradually collapse, thereby achieving demagnetization. For example, while maintaining the frequency of the excitation voltage, the residual magnetism of the transformer core is removed by gradually reducing the amplitude of the excitation voltage. For another example, while maintaining the amplitude of the excitation voltage, the frequency of the excitation voltage is gradually increased to remove the residual magnetism in the transformer core in a continuous attenuation alternation. However, the above methods all require the calculation and control of the current zero crossing point, voltage integral and excitation duration, and the operation is complicated. In addition, the error between feedback comparison, tracking control and the actual instrument output waveform brings about problems such as long demagnetization time and incomplete demagnetization effect. Summary of the invention

[0004] In view of the above problems, the present disclosure provides an energy storage oscillation demagnetization method and an energy storage oscillation demagnetization circuit for a transformer.

[0005] According to a first aspect of the present disclosure, a method for energy storage oscillation demagnetization of a transformer is provided, comprising: obtaining capacitor screening information based on capacitance parameters of multiple candidate capacitors, a first parameter among rated current parameters of the transformer, and a core magnetizing inductance parameter of the transformer; determining an energy storage capacitor having a target capacitance parameter from multiple candidate capacitors based on capacitance parameters of multiple candidate capacitors, a second parameter among rated current parameters, and the capacitance screening information; and electrically connecting the energy storage capacitor to the transformer so as to provide an oscillating voltage to the transformer through the energy storage capacitor to demagnetize the core of the transformer.

[0006] According to an embodiment of the present disclosure, the first parameter is a capacitance parameter of multiple candidate capacitors, the second parameter is a rated current parameter, and the capacitance screening information includes a transformer inductance current value corresponding to the candidate capacitor; the capacitance screening information is obtained based on the capacitance parameters of the multiple candidate capacitors and the first parameter in the rated current parameter of the transformer and the core magnetizing inductance parameter of the transformer, including: processing the core magnetizing inductance parameter and the capacitance parameters of the multiple candidate capacitors according to the first objective function to obtain multiple transformer inductance current values ​​corresponding to the multiple candidate capacitors one by one, wherein the first objective function is used to characterize the relationship between the core magnetizing inductance parameter, the transformer inductance current value and the capacitance parameter; and determining an energy storage capacitor with a target capacitance parameter from multiple candidate capacitors based on the capacitance parameters of the multiple candidate capacitors and the second parameter in the rated current parameter and the capacitance screening information, including: determining the energy storage capacitor from multiple candidate capacitors based on the rated current parameter and the multiple transformer inductance current values.

[0007] According to an embodiment of the present disclosure, an energy storage capacitor is determined from multiple candidate capacitors based on a rated current parameter and multiple transformer inductance current values, including: determining a current numerical relationship between multiple transformer inductance current values ​​and the rated current parameter; determining a target transformer inductance current value from multiple transformer inductance current values ​​based on the current numerical relationship; and determining the candidate capacitor corresponding to the target transformer inductance current value as the energy storage capacitor.

[0008] According to an embodiment of the present disclosure, the capacitance parameters include capacitance capacity parameters and capacitance operating voltage parameters; the first objective function is as follows:

[0009]

[0010] Among them, C represents the capacitance parameter; U represents the capacitor working voltage parameter; L m Indicates the core magnetizing inductance parameter; I Lmax Indicates the transformer inductance current value.

[0011] According to an embodiment of the present disclosure, the first parameter is a rated current parameter, the second parameter is a capacitance parameter of multiple candidate capacitors, and the capacitance screening information includes a capacitance parameter relationship value, which is a relationship value between a capacitor operating voltage parameter and a capacitance capacity parameter; the capacitance screening information is obtained according to the capacitance parameters of multiple candidate capacitors and a first parameter in the rated current parameter of the transformer and a core magnetizing inductance parameter of the transformer, including: according to a second objective function, processing the rated current parameter and the core magnetizing inductance parameter to obtain the capacitance parameter relationship value, wherein the second objective function is used to characterize the relationship between the core magnetizing inductance parameter, the rated current parameter and the capacitance parameter relationship value; and according to the capacitance parameters of multiple candidate capacitors and a second parameter in the rated current parameter and the capacitance screening information, determining an energy storage capacitor with a target capacitance parameter from multiple candidate capacitors, including: determining the energy storage capacitor from multiple candidate capacitors according to the capacitance parameter relationship value and the capacitance parameters of multiple candidate capacitors.

[0012] According to an embodiment of the present disclosure, the capacitance parameters of the candidate capacitor include a capacitance working voltage parameter and a capacitance capacity parameter; determining an energy storage capacitor from multiple candidate capacitors based on a capacitance parameter relationship value and capacitance parameters of multiple candidate capacitors, including: calculating multiple square values ​​corresponding one-to-one to the capacitance working voltage parameters of multiple candidate capacitors; calculating multiple candidate parameter relationship values ​​corresponding one-to-one to the multiple candidate capacitors based on the multiple square values ​​and capacitance capacity parameters of multiple candidate capacitors; obtaining a target parameter relationship value matching the capacitance parameter relationship value by matching the multiple candidate parameter relationship values ​​with the capacitance parameter relationship value; and determining the candidate capacitor corresponding to the target parameter relationship value as an energy storage capacitor.

[0013] According to an embodiment of the present disclosure, an energy storage capacitor having target capacitance parameters is determined from multiple candidate capacitors based on capacitance parameters of multiple candidate capacitors and a second parameter in rated current parameters and capacitance screening information, including: determining a capacitor to be charged having target capacitance parameters from multiple candidate capacitors based on capacitance parameters of multiple candidate capacitors and a second parameter in rated current parameters and capacitance screening information; and charging the capacitor to be charged to obtain an energy storage capacitor.

[0014] According to an embodiment of the present disclosure, an energy storage capacitor is electrically connected to a transformer so as to provide an oscillating voltage to the transformer through the energy storage capacitor to demagnetize the iron core of the transformer, including: electrically connecting the energy storage capacitor to the transformer so that when the energy storage capacitor supplies power to the transformer, the electric field energy of the energy storage capacitor is converted into the magnetic field energy of the iron core of the transformer, and after the magnetic field energy of the iron core is fully stored, the energy storage capacitor receives the electric field energy formed by the magnetic field energy of the iron core, thereby forming an oscillating voltage.

[0015] According to an embodiment of the present disclosure, the relationship between the capacitance parameter of the energy storage capacitor, the core magnetizing inductance parameter and the core loss resistance parameter of the transformer satisfies the following formula:

[0016]

[0017] Wherein, C represents the capacitance parameter of the energy storage capacitor; L m Indicates the core magnetizing inductance parameter; R m Indicates the core loss resistance parameter of the transformer.

[0018] A second aspect of the present disclosure provides an energy storage oscillation demagnetization circuit, comprising: a transformer; and an energy storage capacitor connected in parallel with the transformer, the energy storage capacitor being used to demagnetize the core of the transformer by providing an oscillating voltage to the transformer; wherein the energy storage capacitor is determined from a plurality of candidate capacitors based on capacitance parameters of the plurality of candidate capacitors, a first parameter among rated current parameters of the transformer, and capacitance screening information; the capacitance screening information is obtained based on capacitance parameters of the plurality of candidate capacitors, a second parameter among rated current parameters, and a core magnetizing inductance parameter of the transformer.

[0019] According to an embodiment of the present disclosure, capacitance screening information for screening candidate capacitors is obtained based on capacitance parameters of multiple candidate capacitors, a first parameter among the rated current parameters of the transformer, and the core magnetizing inductance parameter of the transformer, so that an energy storage capacitor having target capacitance parameters can be determined from multiple candidate capacitors based on capacitance parameters of multiple candidate capacitors, a second parameter among the rated current parameters, and the capacitance screening information, thereby improving the accuracy and flexibility of determining the energy storage capacitor.

[0020] Furthermore, the energy storage capacitor and the transformer are electrically connected so that an oscillating voltage is provided to the transformer through the energy storage capacitor to demagnetize the core of the transformer, thereby simplifying the operations required to demagnetize the transformer and reducing the time required for demagnetization.

[0021] Furthermore, since the energy storage capacitor used for demagnetization has a target capacitance parameter, the electric field energy of the energy storage capacitor can deplete the magnetic field energy of the transformer, thereby improving the demagnetization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above contents and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0023] Figure 1 A transformer no-load circuit model diagram according to an embodiment of the present disclosure is schematically shown.

[0024] Figure 2 A schematic diagram of an energy storage oscillation demagnetization circuit according to an embodiment of the present disclosure is schematically shown.

[0025] Figure 3 The principle diagram of the energy storage oscillation demagnetization circuit according to an embodiment of the present disclosure is schematically shown.

[0026] Figure 4 The flowchart of the energy storage oscillation demagnetization method for a transformer according to an embodiment of the present disclosure is schematically shown.

[0027] Figure 5 The structural block diagram of the energy storage oscillation demagnetization device for a transformer according to an embodiment of the present disclosure is schematically shown.

[0028] Figure 6 A block diagram of an electronic device suitable for implementing an energy storage oscillation demagnetization method for a transformer according to an embodiment of the present disclosure is schematically shown. DETAILED DESCRIPTION

[0029] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0030] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0031] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0032] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0033] Figure 1 A transformer no-load circuit model diagram according to an embodiment of the present disclosure is schematically shown.

[0034] Based on the problems in the related art, the inventors found that in some cases, the transformer is closed without load. Therefore, based on the transformer low-frequency no-load model, the transformer can be equivalent to the core loss resistance R m and core magnetizing inductance L m The series connection, such as Figure 1 And, in Figure 1 In the figure, the ground terminal GND, and the coil resistance R1 and the coil leakage inductance L1 of the transformer are also shown.

[0035] On this basis, the present disclosure provides an energy storage oscillation demagnetization circuit to solve the problems in the related art.

[0036] Figure 2 A schematic diagram of an energy storage oscillation demagnetization circuit according to an embodiment of the present disclosure is schematically shown.

[0037] like Figure 2 As shown, the energy storage oscillation demagnetization circuit of this embodiment includes: a transformer 100 and an energy storage capacitor 200 connected in parallel with the transformer 100. The energy storage capacitor 200 is used to demagnetize the core of the transformer 100 by providing an oscillation voltage to the transformer 100.

[0038] Figure 3 The principle diagram of the energy storage oscillation demagnetization circuit according to an embodiment of the present disclosure is schematically shown.

[0039] like Figure 3 As shown, when the energy storage capacitor 200 is electrically connected to the transformer 100, the energy storage capacitor 200 and the core loss resistor R m and core magnetizing inductance L m A typical second-order differential circuit can be formed between them. The electric field energy of the energy storage capacitor 200 and the core excitation inductance L m The magnetic field energy will be converted to each other. Therefore, the core loss resistance R of the transformer 100 m The energy in will be consumed, and then, when the energy is 0, the residual magnetism in the core of the transformer 100 is removed. Figure 3 In FIG. 1 , a ground terminal GND is also shown. The voltage across the energy storage capacitor 200 is represented by U c Indicates. L Indicates the excitation current.

[0040] According to an embodiment of the present disclosure, the energy storage capacitor is determined from a plurality of candidate capacitors based on a first parameter among the capacitance parameters of the plurality of candidate capacitors and the rated current parameters of the transformer and capacitance screening information. The capacitance screening information is obtained based on a second parameter among the capacitance parameters of the plurality of candidate capacitors and the rated current parameters and the core magnetizing inductance parameter of the transformer.

[0041] Among them, the energy storage capacitor is a capacitor that can provide an oscillating voltage for the transformer. For example, the energy storage capacitor is a fully charged capacitor with target capacitance parameters. The capacitor with target capacitance parameters can be screened from multiple candidate capacitors based on capacitance screening information. Among them, the capacitance parameters of multiple candidate capacitors are different. In some embodiments, multiple candidate capacitors are all fully charged capacitors. In other embodiments, multiple candidate capacitors are all uncharged capacitors. The above-mentioned capacitor with target capacitance parameters can be charged after being screened, and the present disclosure does not limit this. The capacitance parameters of each candidate capacitor may include capacitance capacity parameters and capacitance operating voltage parameters, etc.

[0042] For example, the relationship between the capacitance parameter of the energy storage capacitor, the core excitation inductance parameter and the core loss resistance parameter of the transformer satisfies the following formula:

[0043] (1)

[0044] Wherein, C represents the capacitance parameter of the energy storage capacitor. m Indicates the core magnetizing inductance parameter. R m Indicates the core loss resistance parameter of the transformer.

[0045] According to an embodiment of the present disclosure, when different first parameters and second parameters are selected from capacitance parameters of a plurality of candidate capacitors and rated current parameters of a transformer, the obtained capacitance screening information has different characteristics.

[0046] For example, when the rated current parameter is the first parameter and the capacitance parameters of multiple candidate capacitors are the second parameter, the obtained capacitance screening information is information that can be used to reflect the core characteristics of the transformer. On this basis, the capacitance screening information can be calculated based on the rated current parameter and the core magnetizing inductance parameter of the transformer. And, based on the capacitance screening information and the capacitance parameters of multiple candidate capacitors, a capacitor with a target capacitance parameter is determined from multiple candidate capacitors.

[0047] For example, when the capacitance parameter of multiple candidate capacitors is the first parameter and the rated current parameter is the second parameter, the obtained capacitance screening information can be used to reflect the correlation between the candidate capacitors and the core characteristics of the transformer. On this basis, the capacitance screening information corresponding to each candidate capacitor can be calculated based on the capacitance parameter of each candidate capacitor and the core magnetizing inductance parameter of the transformer. And, based on the rated current parameter and the capacitance screening information corresponding to each candidate capacitor, a capacitor with a target capacitance parameter is determined from multiple candidate capacitors.

[0048] The following will be based on Figure 2 and Figure 3 The energy storage oscillation demagnetization circuit described by Figure 4 The energy storage oscillation demagnetization method for a transformer according to the disclosed embodiment is described in detail.

[0049] Figure 4 The flowchart of the energy storage oscillation demagnetization method for a transformer according to an embodiment of the present disclosure is schematically shown.

[0050] like Figure 4 As shown, the energy storage oscillation demagnetization method for a transformer in this embodiment includes operations S410 to S430.

[0051] In operation S410, capacitor screening information is obtained according to capacitance parameters of a plurality of candidate capacitors, a first parameter among rated current parameters of a transformer, and a core magnetizing inductance parameter of the transformer.

[0052] In operation S420, an energy storage capacitor having a target capacitance parameter is determined from the plurality of candidate capacitors according to the second parameter among the capacitance parameters and the rated current parameters of the plurality of candidate capacitors and the capacitance screening information.

[0053] In operation S430, the energy storage capacitor is electrically connected to the transformer, so that an oscillating voltage is provided to the transformer through the energy storage capacitor to demagnetize the core of the transformer.

[0054] According to an embodiment of the present disclosure, capacitance screening information for screening candidate capacitors is obtained based on capacitance parameters of multiple candidate capacitors, a first parameter among the rated current parameters of the transformer, and the core magnetizing inductance parameter of the transformer, so that an energy storage capacitor having target capacitance parameters can be determined from multiple candidate capacitors based on capacitance parameters of multiple candidate capacitors, a second parameter among the rated current parameters, and the capacitance screening information, thereby improving the accuracy and flexibility of determining the energy storage capacitor.

[0055] Furthermore, the energy storage capacitor and the transformer are electrically connected so that an oscillating voltage is provided to the transformer through the energy storage capacitor to demagnetize the core of the transformer, thereby simplifying the operations required to demagnetize the transformer and reducing the time required for demagnetization.

[0056] Furthermore, since the energy storage capacitor used for demagnetization has a target capacitance parameter, the electric field energy of the energy storage capacitor can deplete the magnetic field energy of the transformer, thereby improving the demagnetization effect.

[0057] According to an embodiment of the present disclosure, the first parameter is a capacitance parameter of a plurality of candidate capacitors, the second parameter is a rated current parameter, and the capacitance screening information includes a transformer inductance current value corresponding to the candidate capacitor. According to the capacitance parameters of the plurality of candidate capacitors and the first parameter in the rated current parameter of the transformer and the core magnetizing inductance parameter of the transformer, the capacitance screening information is obtained, including: processing the core magnetizing inductance parameter and the capacitance parameters of the plurality of candidate capacitors according to the first objective function to obtain a plurality of transformer inductance current values ​​corresponding to the plurality of candidate capacitors one by one, wherein the first objective function is used to characterize the relationship between the core magnetizing inductance parameter, the transformer inductance current value and the capacitance parameter. And according to the capacitance parameters of the plurality of candidate capacitors and the second parameter in the rated current parameter and the capacitance screening information, an energy storage capacitor having a target capacitance parameter is determined from the plurality of candidate capacitors, including: determining the energy storage capacitor from the plurality of candidate capacitors according to the rated current parameter and the plurality of transformer inductance current values.

[0058] According to an embodiment of the present disclosure, the capacitance parameters include capacitance capacity parameters and capacitance operating voltage parameters. The first objective function is as follows:

[0059] (2)

[0060] Where, C represents the capacitance parameter. U represents the capacitor working voltage parameter. L m Indicates the core magnetizing inductance parameter. Lmax Indicates the transformer inductance current value. For example, I Lmax The maximum value of the transformer inductance current may be represented. For example, the transformer inductance current value corresponding to each candidate capacitor may be the maximum value of the current flowing through the inductance of the transformer when the candidate capacitor is electrically connected to the transformer.

[0061] For ease of understanding, the process of obtaining the first objective function of the embodiment of the present disclosure is described below:

[0062] based on Figure 1 and Figure 2 According to the circuit structure in the circuit, the loop equation is shown in the following formula (3) based on the UI relationship between capacitance and inductance. Figure 1 , Figure 2 In formulas (1) to (11), the same symbols represent the same meanings and are not repeated here. In the following formulas, t represents time.

[0063] (3)

[0064] The initial conditions of the circuit are as follows,

[0065] (4)

[0066] Let u c =Ae pt , substituting into formula (3) to obtain the characteristic equation:

[0067] (5)

[0068] The characteristic roots P1 and P2 are solved as follows:

[0069] (6)

[0070] In order to generate damped oscillation, the characteristic solution of equation (5) needs to be a pair of conjugate complex roots that satisfies:

[0071] (7)

[0072] It is deduced that:

[0073] (1)

[0074] From formula (1), we can see that the energy storage capacitor and the core loss resistor R m and the core magnetizing inductance L m As long as this condition is met, oscillation demagnetization can be achieved, and the electric field energy of the capacitor and the magnetic field energy of the iron core can be converted into each other.

[0075] Furthermore, let the general solution be:

[0076] (8)

[0077] Among them, A1 and A2 are coefficients.

[0078] The expressions of capacitor voltage and inductor current are obtained by sorting:

[0079] (9)

[0080] in:

[0081] (10)

[0082] In formula (9), is the attenuation oscillation factor of the transformer core magnetic field. is the attenuation angular frequency of the transformer core magnetic field. The larger the capacitance parameter C of the energy storage capacitor, the slower the demagnetization speed. When the capacitance parameter C of the energy storage capacitor is determined, the attenuation oscillation factor and the attenuation angular frequency The transformer core magnetizing inductance parameter L m This can achieve "adaptation" between the alternating excitation cycle and the magnetic field of the transformer core, thereby avoiding the complicated calculation and control operations of current zero crossing, voltage integration, and excitation duration.

[0083] Moreover, during the demagnetization process, the core magnetizing inductance parameter L m Therefore, in some methods, it is necessary to preset the change cycle of the core magnetizing inductance parameter during the demagnetization process in advance. Based on the above “adaptive”, the core magnetizing inductance parameter L of the embodiment of the present disclosure is m When an oscillating voltage is generated between the transformer and the energy storage capacitor, an adaptive change is performed, and the moment when the hysteresis loop of the transformer represents the adaptive change of the core magnetizing inductance parameters is most suitable for demagnetization, thereby ensuring that the demagnetization time is minimized.

[0084] In formula (10), Substituting the expression into the current expression of equation (9) yields:

[0085] (11)

[0086] Since R 2 C 4L, we can simplify equation (11) and take the maximum value of the inductor current to get:

[0087] (2)

[0088] Based on this, the maximum value of the transformer inductance current I Lmax It is proportional to the capacitor working voltage parameter U and the capacitor capacity parameter C. In addition, the maximum value of the transformer inductance current I Lmax It needs to be greater than the working current of the transformer during normal operation, so as to ensure the shortest demagnetization time and the best demagnetization effect. The working current of the transformer during normal operation is determined according to the rated current parameters of the transformer.

[0089] According to an embodiment of the present disclosure, the energy storage capacitor can be determined from among multiple candidate capacitors by comparing the rated current parameter with multiple transformer inductance current values, wherein the transformer inductance current value corresponding to the energy storage capacitor is greater than the rated current parameter.

[0090] According to an embodiment of the present disclosure, by processing the core magnetizing inductance parameter and the capacitance parameters of multiple candidate capacitors according to the first objective function, multiple transformer inductance current values ​​corresponding to the multiple candidate capacitors are obtained. Thus, according to the dimension of the transformer inductance current value, the energy storage capacitor that can be used for demagnetizing the transformer can be accurately screened from the multiple candidate capacitors, so that the magnetic field of the transformer can be exhausted, thereby improving the demagnetization effect.

[0091] According to an embodiment of the present disclosure, an energy storage capacitor is determined from a plurality of candidate capacitors according to a rated current parameter and a plurality of transformer inductance current values, including: determining a current numerical relationship between a plurality of transformer inductance current values ​​and the rated current parameter. According to the current numerical relationship, a target transformer inductance current value is determined from a plurality of transformer inductance current values. And a candidate capacitor corresponding to the target transformer inductance current value is determined as an energy storage capacitor.

[0092] According to an embodiment of the present disclosure, by comparing the rated current parameter with the transformer inductance current value, the current numerical relationship between the transformer inductance current value and the rated current parameter can be determined. The current numerical relationship can be used to characterize the numerical magnitude relationship between the transformer inductance current value and the rated current parameter relative to each other.

[0093] Based on this, a target transformer inductance current value greater than the rated current parameter can be determined from multiple transformer inductance current values ​​according to the current numerical relationship, and a candidate capacitor corresponding to the target transformer inductance current value is determined as an energy storage capacitor.

[0094] According to an embodiment of the present disclosure, by determining a target transformer inductance current value from a plurality of transformer inductance current values ​​based on the current numerical relationship between the plurality of transformer inductance current values ​​and the rated current parameter, and then determining the energy storage capacitor, the accuracy of determining the energy storage capacitor is improved.

[0095] According to an embodiment of the present disclosure, the first parameter is a rated current parameter, the second parameter is a capacitance parameter of a plurality of candidate capacitors, and the capacitance screening information includes a capacitance parameter relationship value, and the capacitance parameter relationship value is a relationship value between a capacitor operating voltage parameter and a capacitance capacity parameter. According to the capacitance parameters of the plurality of candidate capacitors and the first parameter in the rated current parameter of the transformer and the core magnetizing inductance parameter of the transformer, the capacitance screening information is obtained, including: according to the second objective function, the rated current parameter and the core magnetizing inductance parameter are processed to obtain the capacitance parameter relationship value, wherein the second objective function is used to characterize the relationship between the core magnetizing inductance parameter, the rated current parameter and the capacitance parameter relationship value. And according to the capacitance parameters of the plurality of candidate capacitors and the second parameter in the rated current parameter and the capacitance screening information, an energy storage capacitor having a target capacitance parameter is determined from the plurality of candidate capacitors, including: according to the capacitance parameter relationship value and the capacitance parameters of the plurality of candidate capacitors, an energy storage capacitor is determined from the plurality of candidate capacitors.

[0096] According to an embodiment of the present disclosure, the capacitance parameter relationship value is calculated based on the capacitance operating voltage parameter and the capacitance capacity parameter.

[0097] According to an embodiment of the present disclosure, the candidate parameter relationship value of each candidate capacitor can be calculated based on the capacitor operating voltage parameter and the capacitor capacity parameter of each candidate capacitor, and then the candidate parameter relationship value of each candidate capacitor is matched with the capacitor parameter relationship value to determine the energy storage capacitor from multiple candidate capacitors.

[0098] According to an embodiment of the present disclosure, the rated current parameter and the core magnetizing inductance parameter are processed according to the second objective function to obtain a capacitance parameter relationship value. Thus, according to the dimension of the capacitance parameter relationship value, an energy storage capacitor that can be used for demagnetizing the transformer can be accurately screened from multiple candidate capacitors, so that the magnetic field of the transformer can be exhausted, thereby improving the demagnetization effect.

[0099] According to an embodiment of the present disclosure, the capacitance parameters of the candidate capacitor include a capacitance operating voltage parameter and a capacitance capacity parameter. According to the capacitance parameter relationship value and the capacitance parameters of the plurality of candidate capacitors, the energy storage capacitor is determined from the plurality of candidate capacitors, including: calculating a plurality of square values ​​corresponding one to one to the capacitance operating voltage parameters of the plurality of candidate capacitors. According to the plurality of square values ​​and the capacitance capacity parameters of the plurality of candidate capacitors, a plurality of candidate parameter relationship values ​​corresponding one to one to the plurality of candidate capacitors are calculated. By matching the plurality of candidate parameter relationship values ​​with the capacitance parameter relationship value, a target parameter relationship value matching the capacitance parameter relationship value is obtained. And the candidate capacitor corresponding to the target parameter relationship value is determined as the energy storage capacitor.

[0100] According to an embodiment of the present disclosure, the second objective function may be obtained by modifying the first objective function. For example, the second objective function is as follows:

[0101] U 2 C=I 2 Lmax ×L m (12)

[0102] Among them, U 2 C is the above capacitance parameter relationship value, that is, C represents the capacitance parameter. U represents the capacitance working voltage parameter. L m Indicates the core magnetizing inductance parameter. Lmax Indicates the rated current parameter.

[0103] According to an embodiment of the present disclosure, the target parameter relationship value matching the capacitance parameter relationship value may be a candidate parameter relationship value whose difference with the capacitance parameter relationship value is less than or equal to a predetermined difference. The predetermined difference may be set according to demand and is not limited here.

[0104] According to an embodiment of the present disclosure, by calculating multiple square values ​​corresponding one-to-one to the capacitor operating voltage parameters of multiple candidate capacitors, and then calculating multiple candidate parameter relationship values ​​corresponding one-to-one to the multiple candidate capacitors based on the multiple square values ​​and the capacitor capacity parameters of the multiple candidate capacitors, thereby, by matching the multiple candidate parameter relationship values ​​with the capacitor parameter relationship values, a target parameter relationship value matching the capacitor parameter relationship value is obtained, and then the accurate energy storage capacitor can be determined according to the target parameter relationship value.

[0105] According to an embodiment of the present disclosure, according to the capacitance parameters of multiple candidate capacitors and the second parameter in the rated current parameters and the capacitance screening information, an energy storage capacitor with a target capacitance parameter is determined from multiple candidate capacitors, including: according to the capacitance parameters of multiple candidate capacitors and the second parameter in the rated current parameters and the capacitance screening information, a capacitor to be charged with the target capacitance parameter is determined from multiple candidate capacitors. And the capacitor to be charged is charged to obtain an energy storage capacitor.

[0106] According to an embodiment of the present disclosure, the candidate capacitor may be an uncharged capacitor. Based on this, a capacitor to be charged having a target capacitance parameter may be determined from a plurality of candidate capacitors, and the capacitor to be charged may be charged to obtain an energy storage capacitor having the target capacitance parameter.

[0107] According to an embodiment of the present disclosure, an energy storage capacitor is electrically connected to a transformer so as to provide an oscillating voltage to the transformer through the energy storage capacitor to demagnetize the iron core of the transformer, including: electrically connecting the energy storage capacitor to the transformer so as to convert the electric field energy of the energy storage capacitor into the magnetic field energy of the iron core of the transformer when the energy storage capacitor supplies power to the transformer, and after the magnetic field energy of the iron core is fully stored, the energy storage capacitor receives the electric field energy formed by the magnetic field energy of the iron core, thereby forming an oscillating voltage. Thus, when the magnetic field energy of the iron core of the transformer is exhausted, the demagnetization of the transformer is completed.

[0108] Based on the above energy storage oscillation demagnetization method for transformer, the present disclosure also provides an energy storage oscillation demagnetization device for transformer. Figure 5 The device is described in detail.

[0109] Figure 5 The structural block diagram of the energy storage oscillation demagnetization device for a transformer according to an embodiment of the present disclosure is schematically shown.

[0110] like Figure 5 As shown, the energy storage oscillation demagnetization device 500 for a transformer in this embodiment includes an obtaining module 510 , a determining module 520 and a connecting module 530 .

[0111] The acquisition module 510 is used to obtain capacitor screening information according to the capacitance parameters of multiple candidate capacitors, the first parameter of the rated current parameter of the transformer, and the core magnetizing inductance parameter of the transformer. In one embodiment, the acquisition module 510 can be used to perform the operation S410 described above, which will not be repeated here.

[0112] The determination module 520 is used to determine the energy storage capacitor with the target capacitance parameter from the multiple candidate capacitors according to the capacitance parameters and the second parameter in the rated current parameters of the multiple candidate capacitors and the capacitance screening information. In one embodiment, the determination module 520 can be used to perform the operation S420 described above, which will not be repeated here.

[0113] The connection module 530 is used to electrically connect the energy storage capacitor to the transformer so as to provide an oscillating voltage to the transformer through the energy storage capacitor to demagnetize the core of the transformer. In one embodiment, the connection module 530 can be used to perform the operation S430 described above, which will not be described in detail here.

[0114] According to an embodiment of the present disclosure, the acquisition module 510 includes a first processing submodule. The determination module 520 includes a first determination submodule. The first processing submodule is used to process the core magnetizing inductance parameter and the capacitance parameters of multiple candidate capacitors according to the first objective function to obtain multiple transformer inductance current values ​​corresponding to the multiple candidate capacitors, wherein the first objective function is used to characterize the relationship between the core magnetizing inductance parameter, the transformer inductance current value and the capacitance parameter; the first determination submodule is used to determine the energy storage capacitor from the multiple candidate capacitors according to the rated current parameter and the multiple transformer inductance current values.

[0115] According to an embodiment of the present disclosure, the determination submodule includes a first determination unit, a second determination unit and a third determination unit. The first determination unit is used to determine the current numerical relationship between multiple transformer inductance current values ​​and the rated current parameter; the second determination unit is used to determine the target transformer inductance current value from multiple transformer inductance current values ​​according to the current numerical relationship; the third determination unit is used to determine the candidate capacitor corresponding to the target transformer inductance current value as the energy storage capacitor.

[0116] According to an embodiment of the present disclosure, the acquisition module 510 also includes a second processing submodule. The determination module 520 also includes a second determination submodule. The second processing submodule is used to process the rated current parameter and the core magnetizing inductance parameter according to the second objective function to obtain the capacitance parameter relationship value, wherein the second objective function is used to characterize the relationship between the core magnetizing inductance parameter, the rated current parameter and the capacitance parameter relationship value; the second determination submodule is used to determine the energy storage capacitor from multiple candidate capacitors based on the capacitance parameter relationship value and the capacitance parameters of multiple candidate capacitors.

[0117] According to an embodiment of the present disclosure, the second determination submodule includes a first calculation unit, a second calculation unit, a matching unit, and a fourth determination unit. The first calculation unit is used to calculate a plurality of square values ​​corresponding to the capacitor working voltage parameters of a plurality of candidate capacitors; the second calculation unit is used to calculate a plurality of candidate parameter relationship values ​​corresponding to the plurality of candidate capacitors according to the plurality of square values ​​and the capacitance parameters of the plurality of candidate capacitors; the matching unit is used to obtain a target parameter relationship value matching the capacitor parameter relationship value by matching the plurality of candidate parameter relationship values ​​with the capacitor parameter relationship value; the fourth determination unit is used to determine the candidate capacitor corresponding to the target parameter relationship value as an energy storage capacitor.

[0118] According to an embodiment of the present disclosure, the obtaining module 510 includes a third determining submodule and a charging submodule. The third determining submodule is used to determine a capacitor to be charged having a target capacitance parameter from multiple candidate capacitors according to the capacitance parameters of multiple candidate capacitors and the second parameter in the rated current parameter and the capacitance screening information; the charging submodule is used to charge the capacitor to be charged to obtain an energy storage capacitor.

[0119] According to an embodiment of the present disclosure, the connection module 530 is also used to electrically connect the energy storage capacitor to the transformer so that when the energy storage capacitor supplies power to the transformer, the electric field energy of the energy storage capacitor is converted into the magnetic field energy of the iron core of the transformer, and after the magnetic field energy of the iron core is fully stored, the energy storage capacitor receives the electric field energy formed by the magnetic field energy of the iron core, thereby forming an oscillating voltage.

[0120] According to an embodiment of the present disclosure, any multiple modules among the acquisition module 510, the determination module 520 and the connection module 530 can be combined into one module for implementation, or any one of the modules can be split into multiple modules. Alternatively, at least part of the functions of one or more of these modules can be combined with at least part of the functions of other modules and implemented in one module. According to an embodiment of the present disclosure, at least one of the acquisition module 510, the determination module 520 and the connection module 530 can be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on a chip, a system on a substrate, a system on a package, an application specific integrated circuit (ASIC), or can be implemented by hardware or firmware such as any other reasonable way of integrating or packaging the circuit, or implemented in any one of the three implementation modes of software, hardware and firmware or in any appropriate combination of any of them. Alternatively, at least one of the acquisition module 510, the determination module 520 and the connection module 530 can be at least partially implemented as a computer program module, and when the computer program module is run, the corresponding function can be executed.

[0121] Figure 6A block diagram of an electronic device suitable for implementing an energy storage oscillation demagnetization method for a transformer according to an embodiment of the present disclosure is schematically shown.

[0122] like Figure 6 As shown, the electronic device 600 according to an embodiment of the present disclosure includes a processor 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage part 608 to a random access memory (RAM) 603. The processor 601 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or a related chipset and / or a dedicated microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 601 may also include an onboard memory for caching purposes. The processor 601 may include a single processing unit or multiple processing units for performing different actions of the method flow according to an embodiment of the present disclosure.

[0123] In RAM 603, various programs and data required for the operation of electronic device 600 are stored. Processor 601, ROM 602 and RAM 603 are connected to each other via bus 604. Processor 601 performs various operations of the method flow according to the embodiment of the present disclosure by executing the program in ROM 602 and / or RAM 603. It should be noted that the program can also be stored in one or more memories other than ROM 602 and RAM 603. Processor 601 can also perform various operations of the method flow according to the embodiment of the present disclosure by executing the program stored in the one or more memories.

[0124] According to an embodiment of the present disclosure, the electronic device 600 may further include an input / output (I / O) interface 605, which is also connected to the bus 604. The electronic device 600 may further include one or more of the following components connected to the input / output (I / O) interface 605: an input portion 606 including a keyboard, a mouse, etc.; an output portion 607 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage portion 608 including a hard disk, etc.; and a communication portion 609 including a network interface card such as a LAN card, a modem, etc. The communication portion 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the input / output (I / O) interface 605 as needed. A removable medium 611, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 610 as needed, so that a computer program read therefrom is installed into the storage portion 608 as needed.

[0125] The present disclosure also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments; or may exist independently without being assembled into the device / apparatus / system. The above computer-readable storage medium carries one or more programs, and when the above one or more programs are executed, the method according to the embodiment of the present disclosure is implemented.

[0126] According to an embodiment of the present disclosure, the computer-readable storage medium may be a non-volatile computer-readable storage medium, for example, it may include but is not limited to: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, an apparatus or a device. For example, according to an embodiment of the present disclosure, the computer-readable storage medium may include the ROM 602 and / or RAM 603 described above and / or one or more memories other than ROM 602 and RAM 603.

[0127] The embodiment of the present disclosure also includes a computer program product, which includes a computer program, and the computer program contains program code for executing the method shown in the flowchart. When the computer program product is run in a computer system, the program code is used to enable the computer system to implement the energy storage oscillation demagnetization method for a transformer provided in the embodiment of the present disclosure.

[0128] The above functions defined in the system / device of the embodiment of the present disclosure are performed when the computer program is executed by the processor 601. According to the embodiment of the present disclosure, the system, device, module, unit, etc. described above can be implemented by a computer program module.

[0129] In one embodiment, the computer program may rely on tangible storage media such as optical storage devices, magnetic storage devices, etc. In another embodiment, the computer program may also be transmitted and distributed in the form of signals on a network medium, and downloaded and installed through the communication part 609, and / or installed from a removable medium 611. The program code contained in the computer program may be transmitted using any appropriate network medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0130] In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 609, and / or installed from the removable medium 611. When the computer program is executed by the processor 601, the above functions defined in the system of the embodiment of the present disclosure are performed. According to the embodiment of the present disclosure, the system, device, apparatus, module, unit, etc. described above can be implemented by a computer program module.

[0131] According to an embodiment of the present disclosure, the program code for executing the computer program provided by the embodiment of the present disclosure can be written in any combination of one or more programming languages. Specifically, these computing programs can be implemented using high-level process and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, Java, C++, python, "C" language or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, partially on the remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device can be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computing device (for example, using an Internet service provider to connect through the Internet).

[0132] The flow charts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flow chart or block diagram can represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0133] It will be appreciated by those skilled in the art that the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations or combinations are not explicitly described in the present disclosure. In particular, without departing from the spirit and teachings of the present disclosure, the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0134] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A method for energy storage oscillation demagnetization of a transformer, characterized in that: The method comprises: Obtaining capacitor screening information according to capacitance parameters of a plurality of candidate capacitors, a first parameter of the rated current parameters of the transformer, and a core magnetizing inductance parameter of the transformer; Determine an energy storage capacitor having a target capacitance parameter from the plurality of candidate capacitors according to the capacitance parameters of the plurality of candidate capacitors, a second parameter in the rated current parameter, and the capacitance screening information; and The energy storage capacitor is electrically connected to the transformer so as to provide an oscillating voltage to the transformer through the energy storage capacitor to demagnetize the core of the transformer; Wherein, when the first parameter is the capacitance parameter of the plurality of candidate capacitors and the second parameter is the rated current parameter, the capacitance screening information includes the transformer inductance current value corresponding to the candidate capacitor; In the case where the first parameter is the rated current parameter and the second parameter is the capacitance parameter of the multiple candidate capacitors, the capacitance screening information includes a capacitance parameter relationship value, and the capacitance parameter relationship value is a relationship value between a capacitance operating voltage parameter and a capacitance capacity parameter.

2. The method according to claim 1, characterized in that The obtaining of capacitor screening information according to the capacitance parameters of the plurality of candidate capacitors, the first parameter among the rated current parameters of the transformer, and the core magnetizing inductance parameter of the transformer comprises: processing the core magnetizing inductance parameter and the capacitance parameters of the plurality of candidate capacitors according to a first objective function to obtain a plurality of transformer inductance current values ​​corresponding to the plurality of candidate capacitors one by one, wherein the first objective function is used to characterize the relationship between the core magnetizing inductance parameter, the transformer inductance current value, and the capacitance parameter; and The method of determining an energy storage capacitor having target capacitance parameters from the multiple candidate capacitors based on the capacitance parameters of the multiple candidate capacitors, the second parameter in the rated current parameter, and the capacitance screening information comprises: determining the energy storage capacitor from the multiple candidate capacitors based on the rated current parameter and the multiple transformer inductance current values.

3. The method according to claim 2, characterized in that The step of determining the energy storage capacitor from the plurality of candidate capacitors according to the rated current parameter and the plurality of transformer inductance current values ​​comprises: Determining a current numerical relationship between the plurality of transformer inductance current values ​​and the rated current parameter; determining a target transformer inductance current value from the plurality of transformer inductance current values ​​according to the current numerical relationship; and A candidate capacitor corresponding to the target transformer inductance current value is determined as the energy storage capacitor.

4. The method according to claim 2, characterized in that: The capacitor parameters include capacitor capacity parameters and capacitor operating voltage parameters; The first objective function is as follows: Wherein, C represents the capacitance parameter; U represents the capacitor working voltage parameter; L m I represents the core magnetizing inductance parameter; Lmax Represents the transformer inductance current value.

5. The method according to claim 1, characterized in that: The obtaining of the capacitor screening information according to the capacitance parameters of the plurality of candidate capacitors and the first parameter of the rated current parameter of the transformer and the core magnetizing inductance parameter of the transformer comprises: processing the rated current parameter and the core magnetizing inductance parameter according to a second objective function to obtain the capacitance parameter relationship value, wherein the second objective function is used to characterize the relationship between the core magnetizing inductance parameter, the rated current parameter and the capacitance parameter relationship value; and The step of determining an energy storage capacitor having a target capacitance parameter from the multiple candidate capacitors according to the capacitance parameters of the multiple candidate capacitors, the second parameter in the rated current parameter, and the capacitance screening information comprises: determining the energy storage capacitor from the multiple candidate capacitors according to the capacitance parameter relationship value and the capacitance parameters of the multiple candidate capacitors.

6. The method according to claim 5, characterized in that The capacitance parameters of the candidate capacitor include a capacitance operating voltage parameter and a capacitance capacity parameter; The step of determining the energy storage capacitor from the plurality of candidate capacitors according to the capacitance parameter relationship value and the capacitance parameters of the plurality of candidate capacitors comprises: Calculating a plurality of square values ​​corresponding one-to-one to the capacitor operating voltage parameters of the plurality of candidate capacitors; Calculating, according to the plurality of square values ​​and the capacitance parameters of the plurality of candidate capacitors, a plurality of candidate parameter relationship values ​​corresponding one-to-one to the plurality of candidate capacitors; By matching the plurality of candidate parameter relationship values ​​with the capacitance parameter relationship value, a target parameter relationship value matching the capacitance parameter relationship value is obtained; and A candidate capacitor corresponding to the target parameter relationship value is determined as the energy storage capacitor.

7. The method according to claim 1, characterized in that The step of determining an energy storage capacitor having a target capacitance parameter from the plurality of candidate capacitors according to the capacitance parameters of the plurality of candidate capacitors, the second parameter in the rated current parameter, and the capacitance screening information comprises: Determining a capacitor to be charged having a target capacitance parameter from the plurality of candidate capacitors according to the capacitance parameters of the plurality of candidate capacitors, a second parameter in the rated current parameter, and the capacitance screening information; and The capacitor to be charged is charged to obtain the energy storage capacitor.

8. The method according to claim 1, characterized in that The step of electrically connecting the energy storage capacitor to the transformer so as to provide an oscillating voltage to the transformer through the energy storage capacitor to demagnetize the core of the transformer comprises: The energy storage capacitor is electrically connected to the transformer so that when the energy storage capacitor supplies power to the transformer, the electric field energy of the energy storage capacitor is converted into the magnetic field energy of the iron core of the transformer, and after the magnetic field energy of the iron core is fully stored, the energy storage capacitor receives the electric field energy formed by the magnetic field energy of the iron core, thereby forming the oscillating voltage.

9. The method according to claim 1, characterized in that: The relationship between the capacitance parameter of the energy storage capacitor, the core magnetizing inductance parameter and the core loss resistance parameter of the transformer satisfies the following formula: Wherein, C represents the capacitance parameter of the energy storage capacitor; L m represents the core magnetizing inductance parameter; R m It represents the core loss resistance parameter of the transformer.

10. An energy storage oscillation demagnetization circuit, comprising: transformer; as well as an energy storage capacitor connected in parallel with the transformer, the energy storage capacitor being used to demagnetize the core of the transformer by providing an oscillating voltage to the transformer; The energy storage capacitor is determined from the plurality of candidate capacitors according to the capacitance parameters of the plurality of candidate capacitors, the first parameter in the rated current parameter of the transformer, and capacitance screening information; the capacitance screening information is obtained according to the capacitance parameters of the plurality of candidate capacitors, the second parameter in the rated current parameter, and the core magnetizing inductance parameter of the transformer; In the case where the first parameter is a capacitance parameter of the plurality of candidate capacitors and the second parameter is the rated current parameter, the capacitance screening information includes a transformer inductance current value corresponding to the candidate capacitor; In the case where the first parameter is the rated current parameter and the second parameter is the capacitance parameter of the multiple candidate capacitors, the capacitance screening information includes a capacitance parameter relationship value, and the capacitance parameter relationship value is a relationship value between a capacitance operating voltage parameter and a capacitance capacity parameter.

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