CN113037062B - Determination method and device of switch device, processor and converter - Google Patents
Determination method and device of switch device, processor and converter Download PDFInfo
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- CN113037062B CN113037062B CN202110343681.1A CN202110343681A CN113037062B CN 113037062 B CN113037062 B CN 113037062B CN 202110343681 A CN202110343681 A CN 202110343681A CN 113037062 B CN113037062 B CN 113037062B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The application provides a determination method and a determination device of a switching device, a processor and a converter, wherein the determination method of the switching device comprises the following steps: a moving step of controlling the plurality of switching devices to move along a first direction so as to change the distance between any two adjacent switching devices to obtain a prepared switching device, wherein the plurality of switching devices are connected in parallel and arranged along the first direction, and the first direction is perpendicular to the thickness direction of the switching devices; an acquisition step of acquiring predetermined parameters of the preliminary switching device, the predetermined parameters including parameters characterizing the reliability and/or efficiency of the preliminary switching device; a determination step of determining whether the predetermined parameter is within a threshold range; and repeating the moving step, the obtaining step and the determining step at least N times in sequence until the preset parameter is within the threshold range to obtain the switching device, wherein N is a positive integer greater than or equal to 0. The method solves the problem of poor performance of the switching device in the prior art.
Description
Technical Field
The application relates to the field of converters, in particular to a method and a device for determining a switching device, a computer readable storage medium, a processor, a converter and a rail vehicle.
Background
With the development of modern power electronic systems towards higher frequency and higher power, a high-power converter can be formed only by connecting power semiconductor device modules of the same series in series and parallel, the increase of power density is realized, the design is convenient and fast, and the cost is greatly reduced. However, in the working process of the high-power converter, the low current imbalance and the derating coefficient among the parallel switch device modules are very important, the current imbalance can cause the overheating damage of the modules through which the larger current flows and further cause the breakdown of the whole converter system, and in addition, in order to efficiently utilize the switch devices, the low derating coefficient is necessary. The mutual inductance influence caused by the transient electromagnetic effect of the switch is an important factor, and at present, most of the switch device modules in the converter system are in a linear compact layout, which greatly aggravates the mutual inductance influence, and causes larger current imbalance and larger derating coefficient.
Therefore, a method is needed to solve the problem of poor performance of the prior art after a plurality of switching device modules are connected in parallel.
The above information disclosed in this background section is only for enhancement of understanding of the background of the technology described herein and, therefore, certain information may be included in the background that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
The application mainly aims to provide a determination method and device of a switching device, a computer readable storage medium, a processor, a converter and a rail vehicle, so as to solve the problem that in the prior art, a plurality of switching device modules are poor in performance after being connected in parallel.
According to an aspect of an embodiment of the present invention, there is provided a method of determining a switching device, including: a moving step of controlling a plurality of switching devices to move along a first direction so as to change the distance between any two adjacent switching devices to obtain a prepared switching device, wherein the plurality of switching devices are connected in parallel and arranged along the first direction, and the first direction is perpendicular to the thickness direction of the switching devices; an acquisition step of acquiring predetermined parameters of the preliminary switching device, the predetermined parameters including parameters characterizing the reliability and/or efficiency of the preliminary switching device; a determination step of determining whether the predetermined parameter is within a threshold range; and repeating the moving step, the obtaining step and the determining step at least N times in sequence until the preset parameter is in the threshold range to obtain the switching device, wherein N is a positive integer greater than or equal to 0.
Optionally, the obtaining step includes at least one of: acquiring a current imbalance degree of the preliminary switching device, wherein the current imbalance degree is a value representing a current imbalance degree of a plurality of switching devices; obtaining a derating factor for the preliminary switching device, the determining step including at least one of: determining whether the current imbalance is within a first threshold range; determining whether the derating coefficient is within a second threshold range.
Optionally, obtaining the current imbalance of the preliminary switching device includes: acquiring measured current values of a plurality of switching devices; acquiring average current values of a plurality of switching devices; and determining the current imbalance degree according to the measured current value and the average current value.
Optionally, determining the current imbalance degree according to the measured current value and the average current value includes: acquiring a total current value of the preparation switching device; determining a first current value of each of the switching devices, the first current value being a difference between the measured current value and the average current value; determining a sum of second current values of all the switching devices, wherein the sum of the second current values is the current imbalance degree, and the second current value is a ratio of the first current value and the total current value.
Optionally, the moving step comprises: and controlling a plurality of switching devices to move for a preset distance along the first direction, so that the distance between any two adjacent switching devices is the same, and obtaining the preliminary switching device.
Optionally, a plurality of said switching devices are identical.
According to another aspect of the embodiments of the present invention, there is also provided a determination apparatus of a switching apparatus, including: a moving unit, configured to control a plurality of switching devices to move along a first direction to change a distance between any two adjacent switching devices, so as to obtain a preliminary switching device, where the plurality of switching devices are connected in parallel and arranged along the first direction, and the first direction is perpendicular to a thickness direction of the switching devices; an acquisition unit configured to acquire a predetermined parameter of the preliminary switching device, the predetermined parameter including a parameter characterizing reliability and/or efficiency of the preliminary switching device; a determination unit configured to determine whether the predetermined parameter is within a threshold range; and the repeating unit is used for repeating the moving step, the obtaining step and the determining step at least N times in sequence until the preset parameter is within the threshold range, so as to obtain the switch device, wherein N is a positive integer greater than or equal to 0.
According to still another aspect of embodiments of the present invention, there is also provided a computer-readable storage medium including a stored program, wherein the program executes any one of the methods.
According to still another aspect of the embodiments of the present invention, there is further provided a processor, configured to execute a program, where the program executes any one of the methods.
According to another aspect of the embodiments of the present invention, there is also provided a converter, including: at least one switching device, said switching device being obtained by using any of said switching device layout methods.
According to another aspect of the embodiment of the invention, the rail vehicle comprises the converter.
In the embodiment of the present invention, the method for determining the switching device first controls the plurality of switching devices to move along the first direction through the moving step, so that the distance between any two adjacent switching devices is changed, and a preliminary switching device is obtained; then, acquiring a predetermined parameter of the preliminary switching device, which characterizes reliability and/or efficiency of the preliminary switching device, through the acquiring step, specifically, including three cases, a first case where the predetermined parameter is a parameter characterizing reliability of the preliminary switching device, a second case where the predetermined parameter is a parameter characterizing efficiency of the preliminary switching device, and a third case where the predetermined parameter is a parameter characterizing reliability and efficiency of the preliminary switching device; determining whether the predetermined parameter is within a threshold range through the determining step; and finally, repeating the moving step, the obtaining step and the determining step at least 0 times in sequence until the preset parameter is positioned in the threshold range to obtain the switch device. In the method for determining the switching device, the distance between any two adjacent switching devices is changed through the moving step, the obtaining step and the determining step, so that the electromagnetic mutual inductance between a plurality of switching device modules is changed, and further, the preset parameter representing the reliability and/or efficiency of the switching device is changed, the preset parameter is located in the threshold range, the reliability and/or efficiency of the switching device are guaranteed to meet requirements, and the problem that the performance of the switching device in the prior art is poor is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application, and the description of the exemplary embodiments and illustrations of the application are intended to explain the application and are not intended to limit the application. In the drawings:
fig. 1 shows a flow chart of a method of determining a switching device according to an embodiment of the present application;
FIG. 2 illustrates a schematic position diagram of a plurality of switching devices according to an embodiment of the present application;
FIG. 3 illustrates a schematic position diagram of a plurality of switching devices according to another embodiment of the present application;
FIG. 4 illustrates a schematic diagram of mutual inductance between a plurality of switching devices as a function of pitch according to an embodiment of the present application;
FIG. 5 is a schematic diagram showing the variation of the impedance of the laminated busbar and busbar bars with pitch according to an embodiment of the application;
FIG. 6 illustrates a schematic of a current imbalance and derating factor of a switching device according to one embodiment of the present application as a function of pitch;
fig. 7 shows a schematic diagram of a determination device of a switching device according to an embodiment of the present application.
Wherein the reference numerals in the above figures are explained as follows:
1. a first switching device; 2. a second switching device; 3. a third switching device.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all 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 application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
As mentioned in the background of the invention, in order to solve the above problem of poor performance of a plurality of switching device modules connected in parallel in the prior art, in an exemplary embodiment of the present application, a method and an apparatus for determining a switching device, a computer readable storage medium, a processor, a converter and a rail vehicle are provided.
According to an embodiment of the present application, a method of determining a switching device is provided.
Fig. 1 is a flowchart of a method of determining a switchgear according to an embodiment of the present application. As shown in fig. 1, the method comprises the steps of:
a step S101 of controlling a plurality of switching devices to move along a first direction to change a distance between any two adjacent switching devices, so as to obtain a preliminary switching apparatus, wherein the plurality of switching devices are connected in parallel and arranged along the first direction, and the first direction is perpendicular to a thickness direction of the switching devices;
step S102, an obtaining step, in which preset parameters of the preparation switch device are obtained, and the preset parameters comprise parameters representing the reliability and/or efficiency of the preparation switch device;
step S103, a determining step, namely determining whether the preset parameter is in a threshold range;
and step S104, repeating the moving step, the obtaining step and the determining step at least N times in sequence until the preset parameter is within the threshold range, and obtaining the switch device, wherein N is a positive integer greater than or equal to 0.
In the method for determining the switch device, firstly, the plurality of switch devices are controlled to move along a first direction through the moving step, so that the distance between any two adjacent switch devices is changed, and a preliminary switch device is obtained; then, acquiring a predetermined parameter of the preliminary switching device, which is indicative of reliability and/or efficiency of the preliminary switching device, through the acquiring step, specifically, including three cases, a first case where the predetermined parameter is a parameter indicative of reliability of the preliminary switching device, a second case where the predetermined parameter is a parameter indicative of efficiency of the preliminary switching device, and a third case where the predetermined parameter is a parameter indicative of reliability and efficiency of the preliminary switching device; determining whether the predetermined parameter is within a threshold range through the determining step; and finally, repeating the moving step, the obtaining step and the determining step at least 0 times in sequence until the preset parameter is within the threshold range to obtain the switch device. In the method for determining the switching device, the distance between any two adjacent switching devices is changed through the moving step, the obtaining step and the determining step, so that the electromagnetic mutual inductance between a plurality of switching device modules is changed, and further, the preset parameter representing the reliability and/or efficiency of the switching device is changed, the preset parameter is located in the threshold range, the reliability and/or efficiency of the switching device are guaranteed to meet the requirement, and the problem that the performance of the switching device in the prior art is poor is solved.
In a specific embodiment of the present application, as shown in fig. 2 and 3, the number of the switching devices in the switching apparatus is 3, which are the first switching device 1, the second switching device 2 and the third switching device 3, respectively, the first switching device 1, the second switching device 2 and the third switching device 3 are the same, fig. 2 is an initial position relationship diagram of the first switching device 1, the second switching device 2 and the third switching device 3, as can be seen from fig. 2, the first switching device 1, the second switching device 2 and the third switching device 3 are arranged next to one another, at this time, the influence of the mutual electromagnetic inductance between the three switching devices is large, so that the measured reliability and/or efficiency of the switching apparatus is poor, and by controlling 3 switching devices to move along the first direction, the distance between the first switching device 1, the second switching device 2 and the third switching device 3 is increased, the positional relationship diagram shown in fig. 3 is obtained, as can be seen from fig. 3, distances between the first switching device 1, the second switching device 2 and the third switching device 3 are respectively d, and compared with the switching apparatus of fig. 2, the switching apparatus of fig. 3 weakens the electromagnetic effect between the switching devices and reduces the mutual inductance effect between the switching devices by increasing the distances between the switching devices, so that the reliability and/or efficiency of the switching apparatus corresponding to fig. 3 are better. Of course, the switch device may further include a plurality of switch devices, and the initial position of the switch device is not limited to the position shown in fig. 2, and the specific manner of movement is not limited to the manner shown in fig. 3.
In a more specific embodiment of the present application, a schematic diagram of the mutual inductance between 3 parallel switching devices in fig. 2 and 3 as a function of the distance between adjacent switching devices is shown in fig. 4, and it can be seen from fig. 4 that when the distance between adjacent switching devices is small, the mutual inductance M12 between the first switching device 1 and the second switching device 2 is equal to the mutual inductance M23 between the second switching device 2 and the third switching device 3 due to symmetry and is much larger than the mutual inductance M13 between the first switching device 1 and the third switching device 3, and by increasing the distance, the electromagnetic mutual inductance between the three switching devices is simultaneously weakened.
In a specific embodiment of the present application, the switch device is a laminated busbar or a bus bar, fig. 5 shows a corresponding relationship between parasitic impedances of the laminated busbar and the bus bar composed of 3 parallel switches and a distance between adjacent switches, when the distance is small, due to symmetry, the parasitic impedances of the bus bar and the laminated busbar are small, and when the distance is increased, the parasitic impedances of the bus bar and the laminated busbar are also increased.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
In an embodiment of the application, the obtaining step includes at least one of: acquiring a current imbalance degree of the preliminary switching device, wherein the current imbalance degree is a value representing a current imbalance degree of the plurality of switching devices; obtaining a derating factor of said preliminary switching device, said determining step comprising at least one of: determining whether the current imbalance is within a first threshold range; it is determined whether the derating factor is within a second threshold range. In this embodiment, by obtaining the current imbalance degree and/or the derating coefficient of the preliminary switching device, determining whether the current imbalance degree is within the first threshold range, determining whether the derating coefficient is within the second threshold range, and determining whether the moved current imbalance degree and/or derating coefficient of the switching device meets the threshold requirement, it is further ensured that the obtained current imbalance degree and/or derating coefficient of the switching device is low, the performance of the switching device is better, and the problem of poor performance after parallel connection of a plurality of switching device modules in the prior art is further solved.
In another embodiment of the present application, obtaining the current imbalance of the preliminary switching device includes: obtaining the actually measured current values of a plurality of the switching devices; obtaining average current values of a plurality of switching devices; and determining the current imbalance degree according to the measured current value and the average current value. In this embodiment, the measured current values and the average current values of the plurality of switching devices are obtained, and then the current imbalance can be determined simply and accurately according to the measured current values and the average current values.
In another embodiment of the present invention, the determining the current imbalance degree based on the measured current value and the average current value includes: acquiring the total current value of the preparation switching device; determining a first current value for each of said switching devices, said first current value being the difference between said measured current value and said average current value; and determining the sum of the second current values of all the switching devices, wherein the sum of the second current values is the current imbalance degree, and the second current value is the ratio of the first current value to the total current value, so that the calculation method of the current imbalance degree is further ensured to be simple and accurate.
In a specific embodiment, when a plurality of switching devices are operated in parallel, there is a more or less current imbalance, i.e. the current flowing through each switching device is not uniform, and therefore, the current imbalance is expressed by using the concept of current imbalance, which is expressed as follows:
wherein, IiIndicating the measured current value, I, flowing through the I-th switching deviceaveThe average current value of a plurality of switching devices is shown, N is the number of the switching devices, and the larger the current imbalance degree is, the more uneven the current flowing through the parallel switching devices is.
In a more specific embodiment of the present application, when a plurality of switching devices are operated in parallel, for safe operation of the apparatus, a method for reducing the device utilization rate is proposed, and the extent of reduced operation of the devices is expressed by using the concept of derating coefficient, which is expressed as follows:
wherein, IiIndicating the measured current value, I, flowing through the I-th switching devicenormThe rated current value of the switching device is represented, and the larger the derating coefficient is, the lower the utilization rate of the parallel switching device is.
In a more specific embodiment of the present application, as shown in fig. 6, when the switching device is applied, the switching device is composed of 3 parallel switching devices, the imbalance degree of the current and the derating coefficient are in a variation relationship with the pitch, when the pitch is small, the electromagnetic mutual inductance between the modules of the switching devices is strong, the parasitic impedance of the bus bar and the laminated bus bar is small, the influence of the electromagnetic is large, the imbalance degree of the current is large, and the derating coefficient required by the device is large; when the distance is increased to the adaptive distance, the electromagnetic mutual inductance between the modules of the switching device is weakened, the parasitic impedance of the bus bar and the laminated bus bar is moderate, the current imbalance is reduced, and the derating coefficient required by the device is small; when the distance is excessively increased, the electromagnetic mutual inductance between the modules of the switching device is ignored, and the parasitic impedance of the bus bar and the laminated bus bar is increased, so that the current imbalance is increased, and the derating coefficient required by the device is increased.
In order to ensure that the switching device with better performance is obtained more simply, in another embodiment of the present application, the moving step includes: and controlling a plurality of the switching devices to move a predetermined distance along the first direction, so that the distance between any two adjacent switching devices is the same, and obtaining the preliminary switching device. In this embodiment, the distance between any two adjacent switching devices is the same by moving the plurality of switching devices, which ensures that the operation process is simple and easy to operate, thereby ensuring that the switching device with better reliability and/or efficiency can be obtained simply and quickly.
In an embodiment of the present application, a plurality of the switching devices are the same, which further ensures that the determination method of the switching device is simple.
The embodiment of the present application further provides a determining apparatus for a switching device, and it should be noted that the determining apparatus for a switching device according to the embodiment of the present application may be used to execute the determining method for a switching device according to the embodiment of the present application. The following describes a determination device of a switching device provided in an embodiment of the present application.
Fig. 7 is a schematic diagram of a determination device of a switching device according to an embodiment of the present application. As shown in fig. 7, the apparatus includes:
a moving unit 10 for controlling a plurality of switching devices to move along a first direction to change a distance between any two adjacent switching devices to obtain a preliminary switching device, wherein the plurality of switching devices are connected in parallel and arranged along the first direction, and the first direction is perpendicular to a thickness direction of the switching devices;
an obtaining unit 20 for obtaining predetermined parameters of the preliminary switching device, the predetermined parameters including parameters characterizing reliability and/or efficiency of the preliminary switching device;
a determination unit 30 for determining whether the predetermined parameter is within a threshold range;
and a repeating unit 40, configured to repeat the moving step, the obtaining step, and the determining step at least N times in sequence until the predetermined parameter is within the threshold range, so as to obtain the switch device, where N is a positive integer greater than or equal to 0.
In the layout device of the switch device, the moving unit is used for controlling a plurality of switch devices to move along a first direction, so that the distance between any two adjacent switch devices is changed, and a preliminary switch device is obtained; the acquisition unit is used for acquiring a predetermined parameter of the preliminary switch device, which represents the reliability and/or the efficiency of the preliminary switch device, specifically, the acquisition unit comprises three conditions, namely, a first condition that the predetermined parameter is a parameter representing the reliability of the preliminary switch device, a second condition that the predetermined parameter is a parameter representing the efficiency of the preliminary switch device, and a third condition that the predetermined parameter is a parameter representing the reliability and the efficiency of the preliminary switch device; the determining unit is used for determining whether the predetermined parameter is in a threshold range; the repeating unit is used for repeating the moving step, the obtaining step and the determining step at least 0 times in sequence until the preset parameter is within the threshold range, and obtaining the switch device. In the determination device of the switching device, the distance between any two adjacent switching devices is changed through the moving unit, the obtaining unit and the determining unit, so that the electromagnetic mutual inductance between a plurality of switching device modules is changed, and further, the preset parameter representing the reliability and/or efficiency of the switching device is changed, the preset parameter is located in the threshold range, the reliability and/or efficiency of the switching device are guaranteed to meet requirements, and the problem that the performance of the switching device in the prior art is poor is solved.
In a specific embodiment of the present application, as shown in fig. 2 and 3, the number of the switching devices in the switching apparatus is 3, which are the first switching device 1, the second switching device 2 and the third switching device 3, respectively, the first switching device 1, the second switching device 2 and the third switching device 3 are the same, fig. 2 is an initial position of the first switching device 1, the second switching device 2 and the third switching device 3, as seen from fig. 2, the first switching device 1, the second switching device 2 and the third switching device 3 are arranged next to one another, at this time, the influence of the mutual electromagnetic inductance between the three switching devices is large, so that the measured reliability and/or efficiency of the switching apparatus is poor, and by controlling 3 switching devices to move along the first direction, the distance between the first switching device 1, the second switching device 2 and the third switching device 3 is increased, the position diagram shown in fig. 3 is obtained, as can be seen from fig. 3, distances between the first switching device 1, the second switching device 2 and the third switching device 3 are respectively d, and compared with the switching apparatus of fig. 2, the switching apparatus of fig. 3 weakens the electromagnetic effect between the switching devices by increasing the distances between the switching devices, reduces the mutual inductance effect between the switching devices, and therefore, the reliability and/or efficiency of the switching apparatus corresponding to fig. 3 are better. Of course, the switching device may further include a plurality of switching devices, and the initial position of the switching device is not limited to the position shown in fig. 2, and the specific manner of movement is not limited to the manner shown in fig. 3.
In a more specific embodiment of the present application, a schematic diagram of the mutual inductance between 3 parallel switching devices in fig. 2 and 3 varying with the distance between the adjacent switching devices is shown in fig. 4. as can be seen from fig. 4, when the distance between the adjacent switching devices is small, the mutual inductance M12 between the first switching device 1 and the second switching device 2 is equal to the mutual inductance M23 between the second switching device 2 and the third switching device 3 due to symmetry and is much larger than the mutual inductance M13 between the first switching device 1 and the third switching device 3, and by increasing the distance, the electromagnetic mutual inductance between the three switching devices is simultaneously weakened.
In a specific embodiment of the present application, the switch device is a laminated busbar or a bus bar, fig. 5 shows a corresponding relationship between parasitic impedances of the laminated busbar and the bus bar composed of 3 parallel switches and a distance between adjacent switches, when the distance is small, due to symmetry, the parasitic impedances of the bus bar and the laminated busbar are small, and when the distance is increased, the parasitic impedances of the bus bar and the laminated busbar are also increased.
In an embodiment of the application, the obtaining unit further includes a first obtaining module and a second obtaining module, where the first obtaining module is configured to obtain a current imbalance of the preparation switch device, where the current imbalance is a value representing a current imbalance degree of the plurality of switching devices; the determining unit further comprises a first determining module and a second determining module, wherein the first determining module is used for determining whether the current imbalance is in a first threshold range; the second determining module is used for determining whether the derating coefficient is in a second threshold range. The method comprises the steps of obtaining the current unbalance degree and/or the derating coefficient of a prepared switching device, determining whether the current unbalance degree is within a first threshold range or not, determining whether the derating coefficient is within a second threshold range or not, and determining whether the current unbalance degree and/or the derating coefficient of the moved switching device meet threshold requirements or not, so that the obtained current unbalance degree and/or the derating coefficient of the switching device are lower, the performance of the switching device is better, and the problem that the performance of a plurality of switching device modules is poorer after being connected in parallel in the prior art is further solved.
In another embodiment of the present application, the first obtaining module further includes a first obtaining submodule, a second obtaining submodule, and a first determining submodule, where the first obtaining submodule is configured to obtain measured current values of the plurality of switching devices; the second obtaining submodule is used for obtaining average current values of a plurality of switching devices; the first determining submodule is used for determining the current imbalance degree according to the actually measured current value and the average current value. In this embodiment, the first obtaining submodule and the second obtaining submodule are respectively configured to obtain measured current values and average current values of the plurality of switching devices, and the first determining submodule is configured to determine the current imbalance according to the measured current values and the average current values, so that the current imbalance can be determined more simply and accurately.
In another embodiment of the present application, the first determining submodule further includes a third obtaining submodule, a second determining submodule, and a third determining submodule, wherein the third obtaining submodule is configured to obtain a total current value of the preliminary switching device; the second determining submodule is used for determining a first current value of each switching device, and the first current value is the difference value of the actually measured current value and the average current value; the third determining submodule is used for determining the sum of second current values of all the switching devices, the sum of the second current values is the current imbalance, and the second current value is the ratio of the first current value to the total current value, so that the current imbalance is further ensured to be simple and accurate in calculation method.
In a specific embodiment, when a plurality of switching devices are operated in parallel, there is a more or less current imbalance, i.e. the current flowing through each switching device is not uniform, and therefore, the current imbalance is expressed by using the concept of current imbalance, which is expressed as follows:
wherein, IiIndicating the measured current value, I, flowing through the I-th switching deviceaveThe average current value of a plurality of switching devices is shown, N is the number of the switching devices, and the larger the current imbalance degree is, the more uneven the current flowing through the parallel switching devices is.
In a more specific embodiment of the present application, when a plurality of switching devices are operated in parallel, for safe operation of the apparatus, a method for reducing the device utilization rate is proposed, and the extent of reduced operation of the devices is expressed by using the concept of derating coefficient, which is expressed as follows:
wherein, IiIndicating the measured current value, I, flowing through the I-th switching devicenormThe rated current value of the switching device is represented, and the larger the derating coefficient is, the lower the utilization rate of the parallel switching device is.
In a more specific embodiment of the present application, as shown in fig. 6, when 3 parallel switching devices are applied, the imbalance degree of the current and the derating coefficient are in a relationship of variation with the pitch, when the pitch is small, the electromagnetic mutual inductance between the switching device modules is strong, the parasitic impedance of the bus bar and the laminated bus bar is small, the influence of the electromagnetic is large, the imbalance degree of the current is large, and the derating coefficient required by the device is large; when the distance is increased to the adaptive distance, the electromagnetic mutual inductance between the modules of the switching device is weakened, the parasitic impedance of the bus bar and the laminated bus bar is moderate, the current imbalance is reduced, and the derating coefficient required by the device is small; when the distance is excessively increased, the electromagnetic mutual inductance between the modules of the switching device is ignored, and the parasitic impedance of the bus bar and the laminated bus bar is increased, so that the current imbalance is increased, and the derating coefficient required by the device is increased.
In order to ensure that the switch device with better performance can be obtained more simply, in another embodiment of the present application, the moving unit further includes a control module, configured to control a plurality of the switch devices to move a predetermined distance along the first direction, so that the distances between any two adjacent switch devices are the same, and thus the preliminary switch device is obtained. In this embodiment, the distance between any two adjacent switching devices is the same by moving the plurality of switching devices, which ensures that the operation process is simple and easy to operate, thereby ensuring that the switching device with better reliability and/or efficiency can be obtained simply and quickly.
In an embodiment of the present application, a plurality of the switching devices are the same, which further ensures that the determination method of the switching device is simple.
The layout device of the switch device comprises a processor and a memory, wherein the moving unit, the obtaining unit, the determining unit, the repeating unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel can be set to be one or more than one, and the problem of poor performance of a plurality of switch device modules connected in parallel in the prior art is solved by adjusting kernel parameters.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
An embodiment of the present invention provides a computer-readable storage medium on which a program is stored, the program implementing the above-described determination method of a switching device when executed by a processor.
The embodiment of the invention provides a processor, wherein the processor is used for running a program, and the determination method of the switch device is executed when the program runs.
An embodiment of the present invention further provides a converter, including: at least one switching device, said switching device being obtained by using any of the above-mentioned switching device layout methods.
The converter comprises at least one switching device, the switching device is obtained by adopting any one of the determining methods of the switching devices, the switching device can meet the requirements on reliability and/or efficiency, the problem of poor performance of the switching device in the prior art is solved, and the good performance of the converter is ensured.
In still another exemplary embodiment of the present application, there is also provided a rail vehicle including the above-described inverter.
The railway vehicle comprises the converter, the converter comprises at least one switching device, the switching device can meet the requirements on reliability and/or efficiency, the problem that the performance of the switching device is poor in the prior art is solved, the performance of the converter is good, the reliability of the railway vehicle is good, and the normal running of the railway vehicle is guaranteed.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein when the processor executes the program, at least the following steps are realized:
a step S101 of controlling a plurality of switching devices to move along a first direction to change a distance between any two adjacent switching devices, so as to obtain a preliminary switching apparatus, wherein the plurality of switching devices are connected in parallel and arranged along the first direction, and the first direction is perpendicular to a thickness direction of the switching devices;
step S102, an obtaining step, in which preset parameters of the preparation switch device are obtained, and the preset parameters comprise parameters representing the reliability and/or efficiency of the preparation switch device;
step S103, a determining step, namely determining whether the preset parameter is in a threshold range;
and step S104, repeating the moving step, the obtaining step and the determining step at least N times in sequence until the preset parameter is within the threshold range, and obtaining the switch device, wherein N is a positive integer greater than or equal to 0.
The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program of initializing at least the following method steps when executed on a data processing device:
a step S101 of controlling a plurality of switching devices to move along a first direction to change a distance between any two adjacent switching devices, so as to obtain a preliminary switching apparatus, wherein the plurality of switching devices are connected in parallel and arranged along the first direction, and the first direction is perpendicular to a thickness direction of the switching devices;
step S102, an obtaining step, in which preset parameters of the preparation switch device are obtained, and the preset parameters comprise parameters representing the reliability and/or efficiency of the preparation switch device;
step S103, a determining step, namely determining whether the preset parameter is in a threshold range;
and step S104, repeating the moving step, the obtaining step and the determining step at least N times in sequence until the preset parameter is within the threshold range, and obtaining the switch device, wherein N is a positive integer greater than or equal to 0.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit may be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the above methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
1) firstly, controlling a plurality of switching devices to move along a first direction through the moving step so as to change the distance between any two adjacent switching devices to obtain a prepared switching device; then, acquiring a predetermined parameter of the preliminary switching device, which is indicative of reliability and/or efficiency of the preliminary switching device, through the acquiring step, specifically, including three cases, a first case where the predetermined parameter is a parameter indicative of reliability of the preliminary switching device, a second case where the predetermined parameter is a parameter indicative of efficiency of the preliminary switching device, and a third case where the predetermined parameter is a parameter indicative of reliability and efficiency of the preliminary switching device; determining whether the predetermined parameter is within a threshold range through the determining step; and finally, repeating the moving step, the obtaining step and the determining step at least 0 times in sequence until the preset parameter is within the threshold range to obtain the switch device. In the method for determining the switching device, the distance between any two adjacent switching devices is changed through the moving step, the obtaining step and the determining step, so that the electromagnetic mutual inductance between a plurality of switching device modules is changed, and further, the preset parameter representing the reliability and/or efficiency of the switching device is changed, the preset parameter is located in the threshold range, the reliability and/or efficiency of the switching device are guaranteed to meet the requirement, and the problem that the performance of the switching device in the prior art is poor is solved.
2) The moving unit is used for controlling the plurality of switching devices to move along a first direction, so that the distance between any two adjacent switching devices is changed, and the preliminary switching device is obtained; an obtaining unit configured to obtain a predetermined parameter indicating reliability and/or efficiency of the preliminary switching device, specifically, three cases including a first case where the predetermined parameter is a parameter indicating reliability of the preliminary switching device, a second case where the predetermined parameter is a parameter indicating efficiency of the preliminary switching device, and a third case where the predetermined parameter is a parameter indicating reliability and efficiency of the preliminary switching device; the determining unit is used for determining whether the predetermined parameter is in a threshold range; the repeating unit is used for repeating the moving step, the obtaining step and the determining step at least 0 times in sequence until the preset parameter is within the threshold range, and obtaining the switch device. In the determination device of the switching device, the distance between any two adjacent switching devices is changed through the moving unit, the obtaining unit and the determining unit, so that the electromagnetic mutual inductance between a plurality of switching device modules is changed, and further, the preset parameter representing the reliability and/or efficiency of the switching device is changed, the preset parameter is located in the threshold range, the reliability and/or efficiency of the switching device are guaranteed to meet requirements, and the problem that the performance of the switching device in the prior art is poor is solved.
3) The converter comprises at least one switching device, the switching device is obtained by adopting any one of the determining methods of the switching devices, the switching device can meet the requirements on reliability and/or efficiency, the problem that the performance of the switching device in the prior art is poor is solved, and the good performance of the converter is ensured.
4) The rail vehicle comprises the converter, the converter comprises at least one switching device, the switching device can meet the requirements on reliability and/or efficiency, the problem that the performance of the switching device is poor in the prior art is solved, the performance of the converter is good, the reliability of the rail vehicle is good, and the rail vehicle can normally run.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (11)
1. A method of determining a switching device, comprising:
a moving step of controlling a plurality of switching devices to move along a first direction so as to change the distance between any two adjacent switching devices to obtain a prepared switching device, wherein the plurality of switching devices are connected in parallel and arranged along the first direction, and the first direction is perpendicular to the thickness direction of the switching devices;
an acquisition step of acquiring predetermined parameters of the preliminary switching device, the predetermined parameters including parameters characterizing the reliability and/or efficiency of the preliminary switching device;
a determination step of determining whether the predetermined parameter is within a threshold range;
and repeating the moving step, the obtaining step and the determining step at least N times in sequence until the preset parameter is within the threshold range to obtain the switch device, wherein N is a positive integer.
2. The method of claim 1,
the acquiring step includes at least one of:
acquiring a current imbalance degree of the preparation switching device, wherein the current imbalance degree is a value representing a current imbalance degree of a plurality of switching devices;
obtaining a derating factor for the preliminary switching device,
the determining step includes at least one of:
determining whether the current imbalance is within a first threshold range;
determining whether the derating coefficient is within a second threshold range.
3. The method of claim 2, wherein obtaining the current imbalance of the preliminary switching device comprises:
acquiring measured current values of a plurality of switching devices;
acquiring average current values of a plurality of switching devices;
and determining the current imbalance degree according to the measured current value and the average current value.
4. The method of claim 3, wherein determining the current imbalance based on the measured current value and the average current value comprises:
acquiring a total current value of the preliminary switching device;
determining a first current value of each of the switching devices, the first current value being a difference between the measured current value and the average current value;
determining a sum of second current values of all the switching devices, wherein the sum of the second current values is the current imbalance degree, and the second current value is a ratio of the first current value and the total current value.
5. The method of claim 1, wherein the moving step comprises:
and controlling the plurality of switching devices to move for a preset distance along the first direction, so that the distance between any two adjacent switching devices is the same, and obtaining the preliminary switching device.
6. The method of any one of claims 1 to 5, wherein a plurality of the switching devices are identical.
7. A switching device determination apparatus, comprising:
a moving unit for controlling the plurality of switching devices to move along a first direction to change the distance between any two adjacent switching devices to obtain a prepared switching device, wherein the plurality of switching devices are connected in parallel and arranged along the first direction, and the first direction is perpendicular to the thickness direction of the switching devices;
an acquisition unit configured to acquire a predetermined parameter of the preliminary switching device, the predetermined parameter including a parameter characterizing reliability and/or efficiency of the preliminary switching device;
a determination unit configured to determine whether the predetermined parameter is within a threshold range;
and the repeating unit is used for repeating the moving step, the obtaining step and the determining step at least N times in sequence until the preset parameter is within the threshold range to obtain the switching device, wherein N is a positive integer.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program performs the method of any one of claims 1 to 6.
9. A processor, characterized in that the processor is configured to run a program, wherein the program when running performs the method of any of claims 1 to 6.
10. A current transformer, comprising:
at least one switching device obtained by the method for determining a switching device according to any one of claims 1 to 6.
11. A rail vehicle, comprising:
the current transformer of claim 10.
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| CN202110343681.1A CN113037062B (en) | 2021-03-30 | 2021-03-30 | Determination method and device of switch device, processor and converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3676638B2 (en) * | 2000-01-07 | 2005-07-27 | 東芝三菱電機産業システム株式会社 | Power system switching device and switching method |
| JP4111326B2 (en) * | 2003-05-20 | 2008-07-02 | Ｔｄｋ株式会社 | Switching power supply |
| JP2016046842A (en) * | 2014-08-20 | 2016-04-04 | 株式会社日立製作所 | Power conversion device and elevator employing the same |
| EP3386089B1 (en) * | 2016-07-13 | 2020-01-01 | Fuji Electric Co., Ltd. | Power module |
| CN107565802A (en) * | 2017-08-25 | 2018-01-09 | 北京精密机电控制设备研究所 | A kind of flow equalizing circuit for high-power parallel IGBT module |
| CN110855275B (en) * | 2019-12-02 | 2023-09-29 | 山东元齐新动力科技有限公司 | electronic switch |
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