A magnetostrictive self-eliminating type ultra-high voltage shunt reactor and its regulation method

Abstract

The present invention provides a magnetostrictive self-eliminating type UHV shunt reactor and a regulation method, which relates to the technical field of electrical equipment regulation. In the reactor, multiple layers of iron cores are stacked, and grain-oriented silicon steel and non-oriented silicon steel materials are selected to construct the iron core layers. The current and voltage data of the reactor are collected in real time, and then the real-time magnetic flux density is calculated based on the number of turns, cross-sectional area, voltage, and power supply frequency of the iron core, and further the real-time iron core loss and vibration noise are calculated. By comprehensively evaluating the real-time magnetic flux density, iron core loss, and vibration noise, comparing them with their respective thresholds, the proportion of grain-oriented and non-oriented silicon steel in the iron core is dynamically adjusted, so that the magnetic flux density is kept within a safe range, while reducing the iron core loss and vibration noise. The comprehensive adjustment ratio is generated by combining the adjustment ratios of the three parameters to adjust the proportion of grain-oriented silicon steel in the iron core layer, achieving the purpose of optimizing the performance of the reactor.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment control, and in particular to a magnetostrictive self-eliminating ultra-high voltage shunt reactor and a control method thereof. Background Art

[0002] In the UHV power transmission system, the performance of the reactor as an important power equipment directly affects the stability and safety of the system. However, the traditional reactor will produce significant core loss and vibration noise during operation, especially in the high-frequency and high-voltage operating environment, these problems are more prominent. The selection and design of the core material has an important impact on the performance of the reactor. The existing technology is difficult to take into account the high efficiency and low noise characteristics of the reactor. Especially in high-load operation, the magnetostrictive effect of the core will cause additional mechanical vibration and noise, which will affect the user experience and the maintenance cost of the equipment.

[0003] Existing UHV shunt reactors usually use a single material to form the core, resulting in a lack of flexibility in performance control. On the one hand, the selection of core materials needs to take into account both magnetic conductivity and processing characteristics. On the other hand, the temperature, loss, and noise characteristics of the reactor under different working conditions are difficult to monitor and adjust in real time, resulting in low efficiency of the reactor in practical applications. Therefore, how to optimize the selection and stacking of core materials through intelligent control methods and realize adaptive adjustment of reactors is a technical problem that needs to be solved urgently in the current technical field.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0005] The object of the present invention is to provide a magnetostrictive self-eliminating ultra-high voltage shunt reactor and a control method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for controlling a magnetostrictive self-eliminating ultra-high voltage shunt reactor, the specific steps comprising:

[0008] Step 1: stacking multiple layers of iron cores inside the magnetostriction elimination type UHV shunt reactor to form an iron core layer, wherein the material of the iron core includes oriented silicon steel and non-oriented silicon steel;

[0009] Step 2: Generate the real-time magnetic flux density based on the number of turns, cross-sectional area, voltage, and power supply frequency of the iron core. Generate the real-time iron core loss based on the real-time magnetic flux density, power supply frequency, and iron core characteristics, where the iron core characteristics include the hysteresis loss coefficient, magnetostrictive loss index, and eddy current loss coefficient of the iron core.

[0010] Step 3: Generate a comprehensive adjustment ratio based on the real-time magnetic flux density and the maximum and minimum magnetic flux densities, the actual iron core loss and the iron core loss threshold, and the actual vibration noise and the vibration noise threshold to adjust the ratio of grain-oriented silicon steel and non-grain-oriented silicon steel in the iron core, so that the real-time magnetic flux density is within the range of the maximum and minimum magnetic flux densities, and the real-time iron core loss and real-time vibration noise are reduced below the threshold.

[0011] Furthermore, the iron core layer is composed of multiple iron cores. Some iron cores are made of grain-oriented silicon steel material, and some other iron cores are made of non-grain-oriented silicon steel material, and the stacking method is alternating stacking.

[0012] Furthermore, the formula for generating the magnetic flux density is:

[0013] ;

[0014] where represents the real-time magnetic flux density, represents the rated operating voltage of the reactor, represents the real-time power supply frequency, represents the number of turns of the iron core coil, represents the cross-sectional area of the iron core;

[0015] The formula for generating the iron core loss is:

[0016] ;

[0017] where represents the real-time iron core loss, represents the hysteresis loss coefficient, represents the hysteresis loss index, represents the eddy current loss coefficient;

[0018] The formula for generating the vibration noise is:

[0019] ;

[0020] where represents the real-time vibration noise, represents the magnetostrictive coefficient, represents the reference magnetic flux density, and .

[0021] Furthermore, the principle for generating the comprehensive adjustment ratio to adjust the proportion of grain-oriented silicon steel and non-oriented silicon steel in the iron core is as follows:

[0022] The formula for calculating the adjustment ratio of grain-oriented silicon steel based on the magnetic flux density is:

[0023] ;

[0024] Wherein, represents the adjustment ratio of grain-oriented silicon steel under the influence of magnetic flux density, represents the magnetic flux density of grain-oriented silicon steel, represents the magnetic flux density of non-oriented silicon steel, represents the maximum magnetic flux density, represents the minimum magnetic flux density, represents the current proportion of grain-oriented silicon steel;

[0025] The formula for calculating the adjustment ratio of grain-oriented silicon steel based on the core loss is:

[0026] ;

[0027] Wherein, represents the adjustment ratio of grain-oriented silicon steel under the influence of core loss, represents the core loss of grain-oriented silicon steel, represents the core loss of non-oriented silicon steel, represents the core loss threshold;

[0028] The formula for calculating the adjustment ratio of grain-oriented silicon steel based on vibration noise is:

[0029] ;

[0030] Wherein, represents the adjustment ratio of grain-oriented silicon steel under the influence of vibration noise, represents the vibration noise of grain-oriented silicon steel, represents the noise vibration of non-oriented silicon steel, represents the noise vibration threshold;

[0031] Combining the magnetic flux density, core loss, and vibration noise, the formula for generating the comprehensive adjustment ratio is:

[0032] ;

[0033] Wherein, represents the comprehensive adjustment ratio, respectively represent the weight coefficients of the adjustment ratios affected by the magnetic flux density, core loss, and vibration noise, , and ;

[0034] The proportion of grain-oriented silicon steel after adjustment based on the comprehensive adjustment ratio is:

[0035] ;

[0036] Among them, represents the proportion of grain-oriented silicon steel after adjustment, represents the proportion of grain-oriented silicon steel before adjustment.

[0037] The present invention also provides a magnetostriction self-eliminating type UHV shunt reactor. The interior of the reactor is a stacked structure of multiple layers of core cakes. Some of the core cakes are made of grain-oriented silicon steel sheets, and the other part of the core cakes are made of non-grain-oriented silicon steel sheets. The proportion of the core cakes is regulated by the above-mentioned magnetostriction self-eliminating type UHV shunt reactor regulation method.

[0038] Compared with the prior art, the beneficial effects of the present invention are:

[0039] The present invention calculates the real-time magnetic flux density, core loss and vibration noise according to the collected current and voltage data, realizes dynamic monitoring of the operation state of the reactor, can timely feedback the operation state of the reactor, ensures that the magnetic flux density does not exceed the saturation point of the material, and avoids overheating or damage of the equipment. The core loss can reflect the loss change under different working conditions, and timely discover the problem of too high core loss caused by the design structure; the magnetic flux density is related to the magnetostrictive effect of the core, and the vibration noise caused by magnetostriction can also be reflected through the magnetic flux density. The mechanical faults during the operation of the reactor can be identified through the vibration noise, so as to adjust the internal structure of the reactor, and improve the working safety of the reactor.

[0040] The present invention also adjusts the ratio of grain-oriented silicon steel and non-oriented silicon steel by generating adjustment ratios respectively based on the real-time magnetic flux density and the maximum and minimum magnetic flux densities, the actual core loss and the core loss threshold, and the actual vibration noise and the vibration noise threshold. Grain-oriented silicon steel has better magnetic permeability in a specific direction and can reduce the loss of magnetic flux density; while non-oriented silicon steel shows uniformity in all directions. By adjusting the ratio, the magnetic performance of the reactor can be optimized under different load and frequency conditions, improving its working efficiency and maintaining stable reactor performance; the superior performance of grain-oriented silicon steel helps to reduce hysteresis loss, while non-oriented silicon steel can reduce eddy current loss in terms of structure. Adjusting the ratio of the two can effectively reduce the overall core loss while maintaining good magnetic performance, improve energy efficiency, directly lead to a reduction in heat generation, thereby reducing the temperature rise of the equipment, extending the service life of the equipment, and reducing maintenance costs; different types of silicon steel have differences in magnetostrictive characteristics, and adjusting the ratio of grain-oriented and non-oriented silicon steel can make the vibration characteristics of the core more balanced during operation, thereby reducing vibration noise and reducing mechanical failures caused by vibration, and further enhancing the overall stability and durability of the equipment. It can ensure that the reactor is always in the best working state, enabling the reactor to adapt to the changing needs of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic flowchart of the method of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0043] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0044] Embodiment:

[0045] Please refer to Figure 1 , the present invention provides a technical solution:

[0046] A magnetostrictive self - eliminating method for regulating UHV shunt reactors, the specific steps include:

[0047] Step 1: Stack multiple layers of iron cores inside the magnetostrictive elimination type UHV shunt reactor to form an iron core layer. The materials of the iron cores include grain - oriented silicon steel and non - grain - oriented silicon steel;

[0048] In this embodiment, the iron core layer is composed of multiple iron cores. Some iron cores are made of grain - oriented silicon steel material, and the other part of the iron cores is made of non - grain - oriented silicon steel material. The stacking method is alternating stacking.

[0049] Stack the initial iron cores alternately according to the stacking ratio of grain - oriented silicon steel material to non - grain - oriented silicon steel material of 1:1, and add an insulating layer between each layer of iron cores to prevent eddy current loss and local overheating; Alternating stacking means stacking grain - oriented silicon steel and non - grain - oriented silicon steel alternately according to the stacking ratio, such as one layer of grain - oriented silicon steel + one layer of non - grain - oriented silicon steel or two layers of grain - oriented silicon steel + one layer of non - grain - oriented silicon steel and other stacking ratios.

[0050] Step 2: Generate a real - time magnetic flux density based on the number of turns, cross - sectional area, voltage, and power supply frequency of the iron core. Generate a real - time iron core loss based on the real - time magnetic flux density, power supply frequency, and iron core characteristics. Generate a real - time vibration noise based on the real - time magnetic flux density and the magnetostrictive coefficient of the iron core. The iron core characteristics include the hysteresis loss coefficient, magneto - loss index, and eddy current loss coefficient of the iron core;

[0051] In this embodiment, the formula for generating the magnetic flux density is:

[0052] ;

[0053] Where, represents the real - time magnetic flux density, represents the rated working voltage of the reactor, represents the real - time power supply frequency, represents the number of turns of the iron core coil, represents the cross - sectional area of the iron core;

[0054] In an AC power system, the peak value of the AC voltage and the rated working voltage The relationship between them is That is , , So Where, Denote the magnetic flux; the magnetic flux density reflects the amount of magnetic flux per unit area. The greater the magnetic flux density, the greater the magnetic field strength. When the magnetic flux density approaches the saturation magnetic flux density of the iron core material, the iron core will enter the saturation state, resulting in a sharp increase in losses. By controlling the magnetic flux density, the core losses and vibration noise of the reactor can be optimized. The increase in voltage will lead to an increase in the magnetic field strength, thereby increasing the magnetic flux density. The magnetic flux density is proportional to the rated operating voltage; at the same voltage, the higher the power supply frequency, the faster the change rate of the magnetic flux, and thus the smaller the magnetic flux density. The power supply frequency is inversely proportional to the magnetic flux density; the increase in the number of turns of the coil will disperse the magnetic flux, thereby reducing the magnetic flux density. The number of turns of the iron core coil is inversely proportional to the magnetic flux density; the increase in the cross-sectional area will disperse the magnetic flux, thereby reducing the magnetic flux density. The effective cross-sectional area of the iron core is inversely proportional to the magnetic flux density.

[0055] The formula for generating the core loss is:

[0056] ;

[0057] Wherein, Denote the real-time core loss, Denote the hysteresis loss coefficient, Denote the hysteresis loss exponent, Denote the eddy current loss coefficient;

[0058] The core loss is mainly divided into hysteresis loss and eddy current loss. The hysteresis loss means that the iron core material is repeatedly magnetized in the alternating magnetic field. The change of the current causes the change of the material magnetic field, resulting in internal friction and energy dissipation; the eddy current loss is caused by the induced current generated in the conductive material. Under the action of the alternating electric field, the current in the iron core will form eddy currents, and these eddy currents consume energy. The hysteresis loss coefficient Reflects the magnitude of the hysteresis loss of the material under unit frequency and unit magnetic flux density, which is determined by the hysteresis characteristics of the material. The hysteresis loss coefficient of the material is measured by the Epstein square method and fitted to obtain , the hysteresis loss exponent Reflects the non-linear dependence of the hysteresis loss on the magnetic flux density. The magnitude of the hysteresis loss exponent is related to the material. Usually, the hysteresis loss exponent of grain-oriented silicon steel is 1.6 - 1.8, and that of non-grain-oriented silicon steel is 1.8 - 2.0; the eddy current loss coefficient Reflects the magnitude of the eddy current loss under unit frequency and unit magnetic flux density, which is related to the resistivity and thickness of the material. The higher the resistivity and the thinner the material, The smaller it is. The eddy current loss coefficient of the material is measured by the Epstein square method; the hysteresis loss is proportional to the hysteresis loss, power supply frequency, magnetic flux density, and hysteresis loss exponent, and the eddy current loss is proportional to the eddy current loss coefficient, power supply frequency, and magnetic flux density.

[0059] The formula for generating vibration noise is as follows:

[0060] ;

[0061] wherein, represents the real-time vibration noise, represents the magnetostrictive coefficient, represents the reference magnetic flux density, and ;

[0062] The vibration noise is mainly caused by the magnetostrictive effect. The magnetostrictive effect means that the iron core undergoes periodic deformation under the action of an alternating magnetic field, thereby generating mechanical vibration and noise. The magnetostrictive coefficient reflects the deformation ability of the material under the action of an external magnetic field. Its value is related to the material. Generally, the magnetostrictive coefficient of grain-oriented silicon steel is greater than that of non-oriented silicon steel. is used to convert the vibration amplitude into decibel value. The greater the magnetostrictive coefficient and the magnetic flux density, the more obvious the magnetostrictive effect, and the greater the vibration noise. The reference magnetic flux density is usually taken as 1T, which is used to standardize the vibration noise levels under different conditions. reflects the change in the noise level generated by the reactor under different magnetic flux densities.

[0063] Step 3: Based on the real-time magnetic flux density, the highest magnetic flux density and the lowest magnetic flux density, the actual core loss and the core loss threshold, and the actual vibration noise and the vibration noise threshold, generate a comprehensive adjustment ratio to adjust the ratio of grain-oriented silicon steel and non-oriented silicon steel in the iron core, so that the real-time magnetic flux density is within the range of the highest magnetic flux density and the lowest magnetic flux density, and the real-time core loss and the real-time vibration noise are reduced below the threshold.

[0064] In this embodiment, the principle for generating the comprehensive adjustment ratio to adjust the ratio of grain-oriented silicon steel and non-oriented silicon steel in the iron core is as follows:

[0065] The adjustment ratio is adjusted for the total number of grain-oriented silicon steel and non-oriented silicon steel, which is different from the stacking ratio in Step 1.

[0066] From the aspect of magnetic flux density, the magnetic permeability of grain-oriented silicon steel is relatively high. Increasing the proportion of grain-oriented silicon steel can increase the local magnetic permeability, thereby increasing the magnetic flux density. The magnetic permeability of non-oriented silicon steel is relatively low. Increasing the proportion of non-oriented silicon steel can reduce the local magnetic permeability, thereby reducing the magnetic flux density. If the real-time magnetic flux density exceeds the highest magnetic flux density, it is necessary to reduce the magnetic flux density, which is achieved by increasing the proportion of non-oriented silicon steel. If the real-time magnetic flux density is lower than the lowest magnetic flux density, it is necessary to increase the magnetic flux density, which is achieved by increasing the proportion of grain-oriented silicon steel. The formula for calculating the adjustment ratio of grain-oriented silicon steel is as follows:

[0067] ;

[0068] Among them, represents the adjustment ratio of grain-oriented silicon steel under the influence of magnetic flux density, represents the magnetic flux density of grain-oriented silicon steel, represents the magnetic flux density of non-oriented silicon steel, represents the highest magnetic flux density, represents the lowest magnetic flux density;

[0069] When , it means reducing the proportion of grain-oriented silicon steel, and the greater the magnetic flux density, the greater the reduction proportion of grain-oriented silicon steel to reduce the magnetic flux density;

[0070] When , it means increasing the proportion of grain-oriented silicon steel, and the smaller the magnetic flux density, the greater the increase proportion of grain-oriented silicon steel to increase the magnetic flux density;

[0071] When , no adjustment is required and the current proportion of grain-oriented silicon steel is maintained;

[0072] represents the magnetic flux density of grain-oriented silicon steel, that is, the proportion of grain-oriented silicon steel is 100%, and it is the highest magnetic flux density in the actual process , represents the magnetic flux density of non-oriented silicon steel, that is, the proportion of non-oriented silicon steel is 100% and the proportion of grain-oriented silicon steel is 0, ; the calculated absolute value is between 0 and 1, and when it is positive, it means increasing the proportion of grain-oriented silicon steel, when it is negative, it means reducing the proportion of grain-oriented silicon steel.

[0073] The highest magnetic flux density represents the saturation magnetic flux density of the iron core material, usually 90% of the material saturation value, and the lowest magnetic flux density represents the lower limit of the iron core material utilization rate, usually 70% of the material saturation value. The material saturation value represents the magnetic flux density corresponding to all grain-oriented silicon steel or all non-oriented silicon steel; the actual magnetic flux density is controlled between and to avoid magnetic saturation and insufficient material utilization;

[0074] When , the magnetic flux density is too high, which may cause magnetic saturation of the iron core material, resulting in a sharp increase in iron core loss and too high temperature rise. The magnetic permeability of non-oriented silicon steel is relatively low, which can reduce the local magnetic flux density. Therefore, at this time, it is necessary to increase the proportion of non-oriented silicon steel; when When the magnetic flux density is too low, it may lead to insufficient utilization of the iron core material. The magnetic permeability of grain-oriented silicon steel is relatively high, which can increase the local magnetic flux density. Therefore, at this time, it is necessary to increase the proportion of grain-oriented silicon steel. When When the magnetic flux density is within the safe range, the material ratio can be left unchanged;

[0075] The goal of calculating the adjustment ratio formula is to make the real-time magnetic flux density reach the target range by adjusting the ratio of grain-oriented silicon steel and non-oriented silicon steel. It reflects the difference between the real-time magnetic flux density and the target magnetic flux density. It reflects the difference in magnetic flux density between grain-oriented silicon steel and non-oriented silicon steel under the same working conditions. The larger it is, the higher the magnetic permeability of the grain-oriented silicon steel, and the smaller the adjustment amplitude required to reduce the magnetic flux density. The adjustment ratio is inversely proportional to the difference in magnetic flux density between grain-oriented silicon steel and non-oriented silicon steel, and is inversely proportional to the difference between the real-time magnetic flux density and the target magnetic flux density. of the difference.

[0076] From the perspective of core loss, the hysteresis loss of grain-oriented silicon steel is relatively high, but its magnetic permeability is excellent. The hysteresis loss and eddy current loss of non-oriented silicon steel are relatively low, but its magnetic permeability is relatively low. Increasing the proportion of grain-oriented silicon steel increases the magnetic permeability and the core loss; increasing the proportion of non-oriented silicon steel reduces the magnetic permeability and the core loss. The formula for calculating the adjustment ratio of grain-oriented silicon steel is:

[0077] ;

[0078] Among them, represents the adjustment ratio of grain-oriented silicon steel under the influence of core loss. represents the core loss of grain-oriented silicon steel. represents the core loss of non-oriented silicon steel. represents the core loss threshold;

[0079] When When it is necessary to reduce the core loss and decrease the proportion of grain-oriented silicon steel, and the higher the core loss, the greater the reduction ratio of grain-oriented silicon steel;

[0080] The hysteresis loss of grain-oriented silicon steel is relatively high at high frequencies and high magnetic flux densities. Non-oriented silicon steel has relatively uniform magnetism in all directions and its hysteresis loss is relatively low. represents the adjustment amount required to adjust the real-time core loss to the core loss threshold. When When it indicates that the real-time core loss exceeds the threshold, it is necessary to increase non-oriented silicon steel to reduce the core loss; when When the core loss does not reach the threshold, the proportion of grain-oriented silicon steel can be appropriately increased to improve the performance of the reactor. After each increase in grain-oriented silicon steel, calculate the real-time core loss and the core loss threshold. If it is still within the core loss threshold, the proportion of grain-oriented silicon steel can be continuously increased.

[0081] From the perspective of vibration and noise, the magnetostriction coefficient of grain-oriented silicon steel is high, and it is easy to generate relatively large vibration and noise. The magnetostriction coefficient of non-oriented silicon steel is low, and the generated vibration and noise are small. Increasing the proportion of grain-oriented silicon steel will cause an increase in vibration and noise, and increasing the proportion of non-oriented silicon steel will cause a decrease in vibration and noise. The formula for calculating the adjustment proportion of grain-oriented silicon steel is:

[0082] ;

[0083] Among them, represents the adjustment proportion of grain-oriented silicon steel under the influence of vibration and noise, represents the vibration and noise of grain-oriented silicon steel, represents the noise vibration of non-oriented silicon steel, represents the noise vibration threshold;

[0084] When , it is necessary to reduce the vibration and noise and decrease the proportion of grain-oriented silicon steel. The greater the vibration and noise, the greater the reduction proportion of grain-oriented silicon steel;

[0085] The main source of vibration and noise is the magnetostriction effect, represents the adjustment amount required to adjust the real-time vibration and noise to the vibration and noise threshold. When , it indicates that the real-time vibration and noise exceed the threshold, and it is necessary to increase the proportion of non-oriented silicon steel to reduce the vibration and noise; when , it indicates that the vibration and noise do not reach the threshold, and the proportion of grain-oriented silicon steel can be appropriately increased to improve the performance of the reactor. After each increase in grain-oriented silicon steel, calculate the real-time vibration and noise and the vibration and noise threshold. If it is still within the vibration and noise threshold, the proportion of grain-oriented silicon steel can be continuously increased.

[0086] Combining the magnetic flux density, core loss, and vibration and noise, the formula for generating the comprehensive adjustment proportion is:

[0087] ;

[0088] Among them, represents the comprehensive adjustment proportion, respectively represent the weight coefficients of the adjustment proportions affected by the magnetic flux density, core loss, and vibration and noise, , and .

[0089] The magnetic flux density is the core parameter of the reactor's performance, directly affecting the magnetic field strength and equipment efficiency. Moreover, the magnetic flux density also affects the core loss and vibration noise. Therefore, the control of the magnetic flux density is the primary task with the highest weight. The core loss directly affects the operation efficiency and temperature rise of the equipment, and the vibration noise affects the operation environment and user experience of the equipment. The importance of both is equivalent, and they are given the same weight. Take ; The magnetic flux density, core loss, and vibration noise all affect the ratio of grain-oriented silicon steel to non-oriented silicon steel. Combining the influences of the magnetic flux density, core loss, and vibration noise generates a comprehensive adjustment ratio, which reflects the comprehensive influence on the adjustment ratio of grain-oriented silicon steel.

[0090] The ratio of grain-oriented silicon steel after adjustment based on the comprehensive adjustment ratio is: where, represents the ratio of grain-oriented silicon steel after adjustment, represents the ratio of grain-oriented silicon steel before adjustment.

[0091] The present invention also provides a magnetostriction self-eliminating type UHV shunt reactor. The interior of the reactor is a stacked structure of multiple core cakes. Some core cakes are made of grain-oriented silicon steel sheets, and some other core cakes are made of non-oriented silicon steel sheets. The ratio of the core cakes is regulated by the above-mentioned magnetostriction self-eliminating type UHV shunt reactor regulation method.

[0092] The above formulas are all dimensionless and take their numerical values for calculation. The formulas are obtained by collecting a large amount of data for software simulation to get a formula closest to the actual situation. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0093] For the above embodiments, they can be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by the combination of computer software and electronic hardware. Whether these functions are executed by hardware or software methods depends on the specific application and design constraints of the technical solution.

[0094] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units. They can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0095] As described above, this is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application.

Claims

1. A method for controlling a magnetostrictive self-eliminating ultra-high voltage shunt reactor, characterized in that: The specific steps include: Step 1: stacking multiple layers of iron cores inside the magnetostriction elimination type UHV shunt reactor to form an iron core layer, wherein the material of the iron core includes oriented silicon steel and non-oriented silicon steel; Step 2: Generate real-time magnetic flux density based on the number of turns, cross-sectional area, voltage and power frequency of the iron core, generate real-time core loss based on the real-time magnetic flux density, real-time power frequency and iron core characteristics, and generate real-time vibration noise based on the real-time magnetic flux density and magnetostriction coefficient of the iron core, wherein the iron core characteristics include hysteresis loss coefficient, magnetostriction loss index and eddy current loss coefficient of the iron core; Step 3: Based on the real-time magnetic flux density and the maximum magnetic flux density and the minimum magnetic flux density, the actual core loss and the core loss threshold, the actual vibration noise and the vibration noise threshold, a comprehensive adjustment ratio is generated to adjust the ratio of oriented silicon steel and non-oriented silicon steel in the core, so that the real-time magnetic flux density is within the range of the maximum magnetic flux density and the minimum magnetic flux density, and the real-time core loss and the real-time vibration noise are reduced below the threshold; The formula for calculating the adjustment ratio of oriented silicon steel based on magnetic flux density is: Wherein, x represents the adjustment ratio of oriented silicon steel under the influence of magnetic flux density, B1 represents the magnetic flux density of oriented silicon steel, B2 represents the magnetic flux density of non-oriented silicon steel, and B max Indicates the maximum magnetic flux density, B min Indicates the minimum magnetic flux density; The formula for calculating the adjustment ratio of oriented silicon steel based on core loss is: Among them, y represents the adjustment ratio of oriented silicon steel under the influence of core loss, P1 represents the core loss of oriented silicon steel, P2 represents the core loss of non-oriented silicon steel, P standrad Indicates the core loss threshold; The formula for calculating the adjustment ratio of oriented silicon steel based on vibration noise is: Among them, z represents the adjustment ratio of oriented silicon steel under the influence of vibration noise, L1 represents the vibration noise of oriented silicon steel, L2 represents the noise vibration of non-oriented silicon steel, L standrad Indicates the noise vibration threshold.

2. The method for controlling a magnetostrictive self-eliminating UHV shunt reactor according to claim 1, characterized in that: The iron core layer is composed of multiple iron cores, some of which are made of oriented silicon steel materials, and the other part of the iron cores are made of non-oriented silicon steel materials, and the stacking method is alternating stacking.

3. The method for controlling a magnetostrictive self-eliminating UHV shunt reactor according to claim 1, characterized in that: The formula for generating the magnetic flux density in step 2 is: Where, B represents the real-time magnetic flux density, U e represents the rated working voltage of the reactor, f represents the real-time power frequency, N represents the number of turns of the core coil, and A represents the cross-sectional area of ​​the core; The formula for generating core losses is: P=k h ·f·B α +k e ·f 2 ·B 2 Where P represents the real-time core loss, k h represents the hysteresis loss coefficient, α represents the hysteresis loss index, k e represents the eddy current loss coefficient; The formula for generating vibration noise is: Wherein, L represents real-time vibration noise, λ represents magnetostriction coefficient, B0 represents reference magnetic flux density, and B0=1.

4. A method for controlling a magnetostrictive self-eliminating UHV shunt reactor according to claim 3, characterized in that: The standard for generating a comprehensive adjustment ratio to adjust the ratio of oriented silicon steel and non-oriented silicon steel in the core is: Combining magnetic flux density, core loss and vibration noise, the formula for generating a comprehensive adjustment ratio is: u=w1·x+w2·y+w3·z Among them, u represents the comprehensive adjustment ratio, w1, w2, w3 represent the weight coefficients of the adjustment ratio of magnetic flux density, core loss and vibration noise respectively, w1+w2+w3=1, and w1>w2=w3; The proportion of oriented silicon steel after comprehensive adjustment is: M=M0×(1+u) Wherein, M represents the proportion of oriented silicon steel after adjustment, and M0 represents the proportion of oriented silicon steel before adjustment.

5. A magnetostrictive self-eliminating UHV shunt reactor, characterized in that: The reactor has a stacked structure of multiple layers of core cakes, some of which are made of oriented silicon steel sheets, and the other parts are made of non-oriented silicon steel sheets. The ratio of the core cakes is controlled by the magnetostrictive self-eliminating UHV shunt reactor control method described in any one of claims 1 to 4.

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