阅读说明：本技术 一种变压器直流偏磁抑制方法、装置、设备及介质 (Transformer direct-current magnetic bias suppression method, device, equipment and medium ) 是由 吴泳聪 胡上茂 张义 廖民传 刘刚 贾磊 蔡汉生 钱海 喇元 胡泰山 屈路 冯 于 2021-07-29 设计创作，主要内容包括：本发明提供了一种变压器直流偏磁抑制方法、装置、设备及介质,首先获取变压器中性点处的实测波形数据,并对实测波形数据进行预处理,得到直流偏置分量,再对直流偏置分量进行频域特征分析,得到频域特征分析结果,然后根据频域特征分析结果,对直流偏置分量进行电流成分分析,得到电流成分分析结果,根据电流成分分析结果,计算直流偏置分量的电流成分占比,得到电流成分占比结果,最后基于电流成分与直流偏磁抑制策略之间的预置对应关系,确定与电流成分占比结果对应的直流偏磁抑制策略。采用本发明实施例,能够对变压器直流偏磁电流中不同分量的占比进行计算和分析,从而提出有针对性的抑制措施。(The invention provides a method, a device, equipment and a medium for suppressing direct current magnetic bias of a transformer. By adopting the embodiment of the invention, the ratio of different components in the direct current magnetic bias current of the transformer can be calculated and analyzed, so that a targeted inhibition measure is provided.)

1. A method for suppressing direct current magnetic bias of a transformer is characterized by comprising the following steps:

acquiring actually measured waveform data at a neutral point of a transformer, and preprocessing the actually measured waveform data to obtain a direct current offset component;

performing frequency domain characteristic analysis on the direct current offset component to obtain a frequency domain characteristic analysis result;

according to the frequency domain characteristic analysis result, performing current component analysis on the direct current bias component to obtain a current component analysis result;

calculating the current component proportion of the direct current bias component according to the current component analysis result to obtain a current component proportion result;

and determining a direct-current magnetic bias suppression strategy corresponding to the current component ratio result based on a preset corresponding relation between the current component and the direct-current magnetic bias suppression strategy.

2. The method for suppressing the direct current magnetic bias of the transformer according to claim 1, wherein the step of obtaining actually measured waveform data at a neutral point of the transformer and preprocessing the actually measured waveform data to obtain a direct current bias component comprises:

acquiring actually measured waveform data at a neutral point of the transformer;

and carrying out data filtering on the actually measured waveform data according to a preset frequency to obtain a direct current offset component.

3. The method for suppressing direct current magnetic bias of a transformer according to claim 1, wherein the frequency domain characteristic analysis is performed on the direct current bias component to obtain a frequency domain characteristic analysis result, and specifically comprises:

and analyzing the harmonic content in the direct current offset component to obtain the proportion result of the harmonic content under different frequencies.

4. The method for suppressing the direct current magnetic bias of the transformer according to claim 1, wherein the step of performing current component analysis on the direct current bias component according to the frequency domain characteristic analysis result to obtain a current component analysis result comprises the following specific calculation formula:

i₁＝A₁₀+A₁₁sinω_0.005t+B₁₁cosω_0.005t+A₁₂sin2ω_0.005t+B₁₂cos2ω_0.005t+···

i₂＝A₂₀+A₂₁sinω_0.005t+B₂₁cosω_0.005t+A₂₂sin2ω_0.005t+B₂₂cos2ω_0.005t+···

i＝A₀+A₁sinω_0.005t+B₁cosω_0.005t+A₂sin2ω_0.005t+B₂cos2ω_0.005t+…

wherein i₁Is a stray current in the current component i₂Is an electromagnetically induced current in the current component,i is the DC bias current at the neutral point of the transformer, A₁₀、A₂₀、A₀The zero harmonic coefficients of the stray current, the electromagnetic induction current and the DC bias current, A₁₁、A₂₁And A₁First harmonic coefficients of sinusoidal components of the stray current, the electromagnetic induction current and the direct current bias current, B₁₁、B₂₁And B₁First harmonic coefficients of cosine components of the stray current, the electromagnetic induction current and the direct current bias current, A₁₂、A₂₂And A₂Second harmonic coefficients of sinusoidal components of the stray current, the electromagnetic induction current and the direct bias current, respectively, B₁₂、B₂₂And B₂Second harmonic coefficients of cosine components of the stray current, the electromagnetic induction current and the direct current bias current, respectively; wherein i ═ i₁+i₂。

5. The method for suppressing the direct current magnetic bias of the transformer according to claim 4, wherein the calculation formula for calculating the current component proportion of the direct current bias component according to the current component analysis result to obtain the current component proportion result is specifically as follows:

wherein A is₁₁₀、A₂₁₀And A₁₀Ten harmonic coefficients of the sinusoidal components of the stray current, the electromagnetic induction current and the direct bias current, respectively, B₁₁₀、B₂₁₀And B₁₀The ten harmonic coefficients of cosine components of the stray current, the electromagnetic induced current and the direct current bias current are respectively, m is the ratio of the stray current to the electric potential of a grounding grid, and q is the ratio of the electromagnetic induced current to the electric potential of the grounding grid; wherein m is more than 0 and q is more than 0.

6. The method for suppressing the direct current magnetic bias of the transformer according to claim 1, wherein the step of determining the direct current magnetic bias suppression strategy corresponding to the ratio result of the current component based on a preset corresponding relationship between the current component and the direct current magnetic bias suppression strategy comprises:

and obtaining a ratio distribution result of electromagnetic induction current and stray current in the current components according to the ratio result of the current components, and determining the direct current magnetic bias suppression strategies corresponding to different current components based on the preset corresponding relationship between different current components and the direct current magnetic bias suppression strategies.

7. A transformer DC magnetic bias suppression device is characterized by comprising:

the bias component acquisition module is used for acquiring actually measured waveform data at a neutral point of the transformer and preprocessing the actually measured waveform data to obtain a direct current bias component;

the frequency domain characteristic analysis module is used for carrying out frequency domain characteristic analysis on the direct current offset component to obtain a frequency domain characteristic analysis result;

the current component analysis module is used for carrying out current component analysis on the direct current bias component according to the frequency domain characteristic analysis result to obtain a current component analysis result;

the component proportion calculation module is used for calculating the current component proportion of the direct current bias component according to the current component analysis result to obtain a current component proportion result;

and the direct current magnetic bias suppression module is used for determining a direct current magnetic bias suppression strategy corresponding to the current component ratio result based on a preset corresponding relation between the current component and the direct current magnetic bias suppression strategy.

8. A terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the transformer dc bias suppression method according to any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium, comprising a stored computer program, wherein when the computer program runs, the computer-readable storage medium controls an apparatus to execute the method according to any one of claims 1 to 6.

Technical Field

The invention relates to the technical field of electric power, in particular to a method, a device, equipment and a medium for inhibiting direct-current magnetic bias current of a transformer.

Background

With the wide application of the high-voltage direct-current transmission system, when the system operates in a single-pole ground loop mode, the ground current of the grounding electrode can raise the potential of the peripheral earth surface, so that direct current is generated in an alternating-current transformer with a grounded neutral point, direct-current magnetic bias is caused, and the safe and stable operation of a power system is threatened. Therefore, the research on the bias current caused by the direct current grounding electrode current under different conditions and the suppression measure thereof has very important theoretical and engineering significance.

At present, for the research of the direct current bias current, domestic scholars are generally limited to only judging whether the direct current bias current exists, and foreign countries have few researches on the direct current bias current because the direct current transmission project is not allowed to have a single-pole ground loop operation mode, so that the direct current bias current cannot be effectively researched and analyzed, and further cannot provide a targeted inhibition measure.

Disclosure of Invention

The invention provides a method, a device, equipment and a medium for suppressing direct current magnetic bias of a transformer, which can calculate and analyze the ratio of different components in direct current magnetic bias current of the transformer, thereby providing a targeted suppression measure.

In order to achieve the above object, an embodiment of the present invention provides a method for suppressing dc magnetic bias of a transformer, including the following steps:

acquiring actually measured waveform data at a neutral point of a transformer, and preprocessing the actually measured waveform data to obtain a direct current offset component;

performing frequency domain characteristic analysis on the direct current offset component to obtain a frequency domain characteristic analysis result;

according to the frequency domain characteristic analysis result, performing current component analysis on the direct current bias component to obtain a current component analysis result;

calculating the current component proportion of the direct current bias component according to the current component analysis result to obtain a current component proportion result;

and determining a direct-current magnetic bias suppression strategy corresponding to the current component ratio result based on a preset corresponding relation between the current component and the direct-current magnetic bias suppression strategy.

Further, the acquiring of the actually measured waveform data at the neutral point of the transformer and the preprocessing of the actually measured waveform data to obtain the dc offset component specifically include:

acquiring actually measured waveform data at a neutral point of the transformer;

and carrying out data filtering on the actually measured waveform data according to a preset frequency to obtain a direct current offset component.

Further, the frequency domain characteristic analysis is performed on the dc offset component to obtain a frequency domain characteristic analysis result, which specifically includes:

and analyzing the harmonic content in the direct current offset component to obtain the proportion result of the harmonic content under different frequencies.

Further, the step of performing current component analysis on the dc bias component according to the frequency domain characteristic analysis result to obtain a current component analysis result includes:

i₁＝A₁₀+A₁₁sinω_0.005t+B₁₁cosω_0.005t+A₁₂sin2ω_0.005t+B₁₂cos2ω_0.005t+…

i₂＝A₂₀+A₂₁sinω_0.005t+B₂₁cosω_0.005t+A₂₂sin2ω_0.005t+B₂₂cos2ω_0.005t+…

i＝A₀+A₁sinω_0.005t+B₁cosω_0.005t+A₂sin2ω_0.005t+B₂cos2ω_0.005t+…

wherein i₁Is a stray current in the current component i₂Is electromagnetic induction current in current component, i is direct current at neutral point of transformerBias current, A₁₀、A₂₀、A₀The zero harmonic coefficients of the stray current, the electromagnetic induction current and the DC bias current, A₁₁、A₂₁And A₁First harmonic coefficients of sinusoidal components of the stray current, the electromagnetic induction current and the direct current bias current, B₁₁、B₂₁And B₁First harmonic coefficients of cosine components of the stray current, the electromagnetic induction current and the direct current bias current, A₁₂、A₂₂And A₂Second harmonic coefficients of sinusoidal components of the stray current, the electromagnetic induction current and the direct bias current, respectively, B₁₂、B₂₂And B₂Second harmonic coefficients of cosine components of the stray current, the electromagnetic induction current and the direct current bias current, respectively; wherein i ═ i₁+i₂。

Further, the calculating formula for calculating the current component proportion of the dc offset component according to the current component analysis result to obtain the current component proportion result specifically includes:

wherein A is₁₁₀、A₂₁₀And A₁₀Ten harmonic coefficients of the sinusoidal components of the stray current, the electromagnetic induction current and the direct bias current, respectively, B₁₁₀、B₂₁₀And B₁₀The ten harmonic coefficients of cosine components of the stray current, the electromagnetic induced current and the direct current bias current are respectively, m is the ratio of the stray current to the electric potential of a grounding grid, and q is the ratio of the electromagnetic induced current to the electric potential of the grounding grid; wherein m is more than 0 and q is more than 0.

Further, the determining, based on a preset correspondence between the current component and the dc magnetic bias suppression strategy, a dc magnetic bias suppression strategy corresponding to the current component proportion result specifically includes:

and obtaining a ratio distribution result of electromagnetic induction current and stray current in the current components according to the ratio result of the current components, and determining the direct current magnetic bias suppression strategies corresponding to different current components based on the preset corresponding relationship between different current components and the direct current magnetic bias suppression strategies.

Another embodiment of the present invention correspondingly provides a transformer dc magnetic bias suppression apparatus, including:

the bias component acquisition module is used for acquiring actually measured waveform data at a neutral point of the transformer and preprocessing the actually measured waveform data to obtain a direct current bias component;

the frequency domain characteristic analysis module is used for carrying out frequency domain characteristic analysis on the direct current offset component to obtain a frequency domain characteristic analysis result;

the current component analysis module is used for carrying out current component analysis on the direct current bias component according to the frequency domain characteristic analysis result to obtain a current component analysis result;

the component proportion calculation module is used for calculating the current component proportion of the direct current bias component according to the current component analysis result to obtain a current component proportion result;

and the direct current magnetic bias suppression module is used for determining a direct current magnetic bias suppression strategy corresponding to the current component ratio result based on a preset corresponding relation between the current component and the direct current magnetic bias suppression strategy.

Another embodiment of the present invention correspondingly provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the transformer dc magnetic bias suppression method according to the above embodiment of the present invention is implemented.

Another embodiment of the present invention provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, a device in which the computer-readable storage medium is located is controlled to execute the method for suppressing dc magnetic bias of a transformer according to the above-described embodiment of the present invention.

Compared with the prior art, the transformer direct-current magnetic bias suppression method, the transformer direct-current magnetic bias suppression device, the transformer direct-current magnetic bias suppression equipment and the transformer direct-current magnetic bias suppression medium provided by the embodiment of the invention can calculate and analyze the proportions of different components in the transformer direct-current magnetic bias current, so that the problem that in the prior art, the direct-current magnetic bias sources cannot be distinguished only by judging whether the direct-current magnetic bias current exists or not is solved, the direct-current magnetic bias components can be analyzed more comprehensively, and the targeted suppression measures can be further provided.

Drawings

Fig. 1 is a schematic flowchart of a method for suppressing dc magnetic bias of a transformer according to an embodiment of the present invention;

fig. 2 is a schematic current waveform diagram of a dc bias component at a neutral point after preprocessing in a transformer dc bias suppression method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a frequency domain characteristic analysis result of a transformer dc magnetic bias suppression method according to an embodiment of the present invention;

fig. 4 is a schematic diagram of distribution of current component ratios in a method for suppressing dc magnetic bias of a transformer according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a transformer dc magnetic bias suppression device according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, which is a schematic flow chart of a transformer dc magnetic bias suppression method according to an embodiment of the present invention, the method includes steps S11 to S15:

s11, acquiring actually measured waveform data at a neutral point of the transformer, and preprocessing the actually measured waveform data to obtain a direct current offset component;

s12, performing frequency domain characteristic analysis on the direct current offset component to obtain a frequency domain characteristic analysis result;

s13, according to the frequency domain characteristic analysis result, performing current component analysis on the direct current bias component to obtain a current component analysis result;

s14, calculating the current component proportion of the direct current bias component according to the current component analysis result to obtain a current component proportion result;

and S15, determining the direct current magnetic bias suppression strategy corresponding to the current component ratio result based on the preset corresponding relation between the current component and the direct current magnetic bias suppression strategy.

Compared with the prior art, the transformer direct-current magnetic bias suppression method provided by the embodiment of the invention can calculate and analyze the proportions of different components in the transformer direct-current magnetic bias current, so as to solve the problem that in the prior art, the direct-current magnetic bias source cannot be distinguished only by judging whether the direct-current magnetic bias current exists, can analyze the direct-current magnetic bias component more comprehensively, and is beneficial to further providing a targeted suppression measure.

Further, the acquiring of the actually measured waveform data at the neutral point of the transformer and the preprocessing of the actually measured waveform data to obtain the dc offset component specifically include:

acquiring actually measured waveform data at a neutral point of the transformer;

and carrying out data filtering on the actually measured waveform data according to a preset frequency to obtain a direct current offset component. Illustratively, current data at a neutral point of the transformer is measured to obtain an actually measured waveform, a high-frequency component of the actually measured waveform is filtered to obtain a synthetic current of neutral point unbalanced current and direct current bias current, and direct current bias current in the synthetic current is extracted. The high frequency component is a frequency component greater than a preset frequency 50 HZ. Fig. 2 is a schematic diagram of a current waveform of a dc bias component at a neutral point after pretreatment according to a method for suppressing dc bias of a transformer provided by an embodiment of the present invention, where fig. 2(a) is a schematic diagram of a dc bias current waveform at a neutral point, fig. 2(b) is a schematic diagram of a dc bias current waveform of a stray current, and it can be seen from fig. 2(b) that a total bias current changes positively or negatively and extremely irregularly with time.

It should be noted that the preset frequency may be set according to actual requirements or experiments, and is not limited herein.

Further, the frequency domain characteristic analysis is performed on the dc offset component to obtain a frequency domain characteristic analysis result, which specifically includes:

and analyzing the harmonic content in the direct current offset component to obtain the proportion result of the harmonic content under different frequencies.

It can be understood that the frequency domain characteristic analysis includes different harmonic content ratio relationships, and the frequency domain analysis of the filtered dc bias current waveform can obtain different ratio conditions.

For example, referring to fig. 3, the frequency domain characteristic analysis result at the neutral point after frequency domain analysis is shown schematically, fig. 3(a) is a frequency domain proportion distribution diagram of the dc bias current after frequency domain analysis, and fig. 3(b) is a proportion distribution diagram of the stray current after frequency domain analysis.

Further, the step of performing current component analysis on the dc bias component according to the frequency domain characteristic analysis result to obtain a current component analysis result includes:

i₁＝A₁₀+A₁₁sinω_0.005t+B₁₁cosω_0.005t+A₁₂sin2ω_0.005t+B₁₂cos2ω_0.005t+…

i₂＝A₂₀+A₂₁sinω_o.005t+B₂₁cosω_o.005t+A₂₂sin2ω_0.005t+B₂₂cos2ω_0.005t+…

i＝A₀+A₁sinω_0.00st+B₁cosω_0.005t+A₂sin2ω_0.005t+B₂cos2ω_0.005t+…

wherein i₁Is a stray current in the current component i₂Is the electromagnetic induction current in the current component, i is the DC bias current at the neutral point of the transformer, A₁₀、A₂₀、A₀The zero harmonic coefficients of the stray current, the electromagnetic induction current and the DC bias current, A₁₁、A₂₁And A₁First harmonic coefficients of sinusoidal components of the stray current, the electromagnetic induction current and the direct current bias current, B₁₁、B₂₁And B₁First harmonic coefficients of cosine components of the stray current, the electromagnetic induction current and the direct current bias current, A₁₂、A₂₂And A₂Second harmonic coefficients of sinusoidal components of the stray current, the electromagnetic induction current and the direct bias current, respectively, B₁₂、B₂₂And B₂Second harmonic coefficients of cosine components of the stray current, the electromagnetic induction current and the direct current bias current, respectively; wherein i ═ i₁+i₂。

It can be understood that, based on the linear property of frequency domain analysis, the stray current intruding into the transformer and the potential waveform of the transformer substation grounding grid are basically the same, and the induced current intruding into the transformer by the power transmission line and the induced voltage waveform on the power transmission line are basically the same.

Further, the calculating formula for calculating the current component proportion of the dc offset component according to the current component analysis result to obtain the current component proportion result specifically includes:

wherein A is₁₁₀、A₂₁₀And A₁₀Ten harmonic coefficients of the sinusoidal components of the stray current, the electromagnetic induction current and the direct bias current, respectively, B₁₁₀、B₂₁₀And B₁₀The ten harmonic coefficients of cosine components of the stray current, the electromagnetic induced current and the direct current bias current are respectively, m is the ratio of the stray current to the electric potential of a grounding grid, and q is the ratio of the electromagnetic induced current to the electric potential of the grounding grid; wherein m is more than 0 and q is more than 0.

For example, assuming that the ratio of the stray current to the ground grid potential is m, the ratio of the induced current to the ground grid potential is q, the ratio of the stray current is m/(m + q), and the ratio of the induced current is q/(m + q). Wherein, the m and q can be used for characterizing the ratio relation among different components.

It can be understood that, at present, the research of the dc bias current by scholars in China is to analyze the generation reason and the calculation method of the bias current, the calculation of different types of components in the dc bias current is not involved, and since the dc power transmission project is not allowed to have a single-pole earth loop operation mode abroad, the research on the dc bias current is less, and there is no calculation and measurement method for different components in the dc bias current, so that the dc bias source cannot be distinguished, and the effectiveness of subsequent measures is also influenced. Therefore, in order to study the dc bias current more finely, each component is analyzed by separating a component generated by ground potential electromagnetic coupling and a component generated by transmission line electromagnetic induction and calculating a ratio of the two.

Further, the determining, based on a preset correspondence between the current component and the dc magnetic bias suppression strategy, a dc magnetic bias suppression strategy corresponding to the current component proportion result specifically includes:

and obtaining a ratio distribution result of electromagnetic induction current and stray current in the current components according to the ratio result of the current components, and determining the direct current magnetic bias suppression strategies corresponding to different current components based on the preset corresponding relationship between different current components and the direct current magnetic bias suppression strategies.

Illustratively, referring to fig. 4, the ratio distribution of different current components is shown, and it can be seen from the diagram that 9.10% of the transformer neutral point current is stray current, and 90.90% is electromagnetic induction current.

It should be noted that there are two sources of the dc magnetic bias current, one is that the subway stray current generates the dc magnetic bias current through ground coupling, and the other is that the induced current is generated through spatial electromagnetic coupling. If the proportion of direct-current magnetic bias components generated by stray current is large, the direct-current magnetic bias is avoided mainly by adopting a mode of grounding a transformer neutral point capacitor; if the proportion of the induced current is large, a resistor is required to be connected in series in the circuit, or a filter inductor is required to be connected in parallel, or a shielding ground wire is required to be arranged in a main induction section of a main induction circuit to reduce the direct-current magnetic bias current. Therefore, measuring different types of components in the direct current magnetic bias current is the main basis for the next step of direct current magnetic bias treatment. The inductance is connected in parallel between a bus of the transformer and the ground grid, the bus is shared by all power transmission lines, the series resistance is on a lead between the bus and the transformer, and the main induction section is a parallel section of the power transmission lines and the subway. In addition, the series resistor can reduce current, and the inductor is communicated with direct current and alternating current, so that the direct current magnetic bias current passing through the transformer can be reduced.

It can be understood that, regarding the dc magnetic bias current, it is generally considered that the dc magnetic bias current is generated by stray current through earth coupling, but the inventor finds in the research process that the induced voltage generated by the electromagnetic field coupling of the parallel section of the subway is also an important component of the dc magnetic bias current, but how to distinguish the coupling component from the electromagnetic coupling component, no solution exists at present. The inventor finds that the direct current bias waveform of the earth screen potential is different from the waveform of the direct current bias current, and can separate the direct current bias current component generated by the stray current through the earth coupling and the induced current component generated by the space electromagnetic coupling by comparing the frequency spectrum component of the direct current bias electromagnetic wave with the frequency spectrum component of the ground potential.

Referring to fig. 5, a schematic structural diagram of a transformer dc magnetic bias suppression device according to an embodiment of the present invention includes:

the offset component acquiring module 51 is configured to acquire actually measured waveform data at a neutral point of the transformer, and preprocess the actually measured waveform data to obtain a dc offset component;

a frequency domain characteristic analysis module 52, configured to perform frequency domain characteristic analysis on the dc offset component to obtain a frequency domain characteristic analysis result;

a current component analysis module 53, configured to perform current component analysis on the dc bias component according to the frequency domain feature analysis result, so as to obtain a current component analysis result;

a component proportion calculation module 54, configured to calculate a current component proportion of the dc offset component according to the current component analysis result, so as to obtain a current component proportion result;

and the dc magnetic bias suppression module 55 is configured to determine, based on a preset corresponding relationship between the current component and the dc magnetic bias suppression strategy, a dc magnetic bias suppression strategy corresponding to the current component proportion result.

Compared with the prior art, the transformer direct-current magnetic bias suppression device provided by the embodiment of the invention obtains the direct-current bias component through the bias component obtaining module 51, obtains the frequency domain characteristic analysis result through the frequency domain characteristic analysis module 52, obtains the current component analysis result through the current component analysis module 53, and obtains the direct-current magnetic bias suppression strategy through the direct-current magnetic bias suppression module 55. By adopting the embodiment of the invention, the proportion of different components in the direct current magnetic bias current of the transformer can be calculated and analyzed, so that the problem that the direct current magnetic bias sources cannot be distinguished only by judging whether the direct current magnetic bias current exists in the prior art is solved, the direct current magnetic bias components can be analyzed more comprehensively, and the targeted suppression measures can be further provided.

Fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. The terminal device 6 of this embodiment includes: a processor 60, a memory 61 and a computer program stored in said memory 61 and executable on said processor 60. The processor 60, when executing the computer program, implements the steps in the above embodiments of the transformer dc magnetic bias suppression method. Alternatively, the processor 60 implements the functions of the modules in the above device embodiments when executing the computer program.

Illustratively, the computer program may be divided into one or more modules, which are stored in the memory 61 and executed by the processor 60 to accomplish the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the terminal device 6.

The terminal device 6 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device 6 may include, but is not limited to, a processor 60, a memory 61. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of a terminal device and does not constitute a limitation of a terminal device, and may include more or less components than those shown, or combine some components, or different components, for example, the terminal device 6 may further include an input-output device, a network access device, a bus, etc.

The Processor 60 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor 60 is the control center of the terminal device 6 and connects the various parts of the whole terminal device 6 by various interfaces and lines.

The memory 61 may be used for storing the computer programs and/or modules, and the processor 60 implements various functions of the terminal device 6 by running or executing the computer programs and/or modules stored in the memory 61 and calling data stored in the memory 61. The memory 61 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory 61 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.

Wherein, the module integrated by the terminal device 6 can be stored in a computer readable storage medium if it is implemented in the form of software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow in the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium and used by the processor 60 to implement the steps of the above embodiments of the method. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.

It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.

The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, a device where the computer-readable storage medium is located is controlled to execute the transformer dc magnetic bias suppression method described above.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.