CN117792115B - Voltage source type induction heating power supply system, method and storage medium - Google Patents
Voltage source type induction heating power supply system, method and storage medium Download PDFInfo
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Abstract
The application provides a voltage source type induction heating power supply system, a method and a storage medium, wherein the system comprises the following components: the input port of rectifying device is connected with the electric wire netting, and the output port is connected inverting device's input port, inverting device's output port is connected induction coil, rectifying device includes: n+1 active power correction units connected in parallel, the inverter device including: m parallel-connected inverter units, the M parallel-connected inverter units comprising: 1 main inverter unit and M-1 standby inverter units.
Description
Technical Field
The application belongs to the technical field of chips, and particularly relates to a voltage source type induction heating power supply system, a voltage source type induction heating power supply method and a storage medium.
Background
The demand for SiC devices has entered a rapid growth phase, and semiconductor companies in China need higher energy production to preempt the market. The higher throughput targets place higher demands on the reliability of the manufacturing equipment used by the domestic semiconductor companies. Both the SIC growth process and the SIC epitaxial growth process require a long high temperature environment. Induction heating power is a key device to maintain a high temperature environment. In the processing process, any abnormal fault shutdown of the power supply can cause the damage to the high-temperature environment, so that the process flow is interrupted, the raw materials are scrapped, and the productivity is reduced.
The existing voltage source type induction heating power supply system consists of a rectifying part, an inversion part and an induction coil, all parts in the existing voltage source type induction heating power supply system are of a single-path cascading structure, a single machine works, once any part in the induction heating power supply system fails, the induction heating power supply system is integrally stopped, no power is output, and the reliability of the whole system is lower.
Disclosure of Invention
The application provides a voltage source type induction heating power supply system, a method and a storage medium.
In a first aspect, the present application provides a voltage source type induction heating power supply system comprising: the input port of rectifying device is connected with the electric wire netting, and the output port is connected inverting device's input port, inverting device's output port is connected induction coil, rectifying device includes: the rectification device is a rectification device with an N+1 backup function and a high power factor rectification function; the inverter device includes: m parallel-connected inverter units, the M parallel-connected inverter units comprising: 1 main inversion unit and M-1 standby inversion units; when the system is in a normal working state, the main inversion unit is in a normal output state, and the M-1 standby inversion units are in a standby state; the M-1 standby inverter units are used for detecting the waveform diagram of the output current of the main inverter unit, performing fault identification on the waveform diagram of the current to obtain an identification result, and if the identification result is that the waveform diagram is abnormal, selecting one inverter unit from the M-1 standby inverter units as the main inverter unit to perform subsequent current output; n, M are integers greater than or equal to 2.
In a second aspect, there is provided a voltage source type induction heating power supply method applied to a voltage source type induction heating power supply system including: the input port of rectifying device is connected with the electric wire netting, and the output port is connected inverting device's input port, inverting device's output port is connected induction coil, rectifying device includes: the rectification device is a rectification device with an N+1 backup function and a high power factor rectification function; the inverter device includes: m parallel-connected inverter units, the M parallel-connected inverter units comprising: 1 main inversion unit and M-1 standby inversion units; the method comprises the following steps: when the system is in a normal working state, the main inversion unit is in a normal output state, and the M-1 standby inversion units are in a standby state; the M-1 standby inverter units detect the waveform diagram of the output current of the main inverter unit, perform fault identification on the waveform diagram of the current to obtain an identification result, and select one inverter unit from the M-1 standby inverter units as the main inverter unit to perform subsequent current output if the identification result is that the waveform diagram is abnormal; n, M are integers greater than or equal to 2.
In a third aspect, the present application provides a computer storage medium storing a computer program for electronic data exchange, wherein the computer program causes a computer to perform part or all of the steps described in the second aspect of the present application.
The embodiment of the application has the following beneficial effects:
The voltage source type induction heating power supply system provided by the technical scheme of the application comprises: a rectifying device and an inverter device, wherein the rectifying device includes: n+1 active power correction units connected in parallel, the inverter device includes: m inverter units connected in parallel; the input port of the rectifying device is connected with the power grid, the output port of the rectifying device is connected with the input port of the inversion device, and the output port of the inversion device is connected with the induction coil; when the system is in a normal working state, a main inverter unit in M parallel connected inverter units is in a normal output state, and M-1 standby inverter units are in a hot standby state; and each standby inverter unit in the M-1 standby inverter units is used for detecting a waveform diagram of output current, performing fault identification on the waveform diagram of the current to obtain an identification result, and selecting one inverter unit from the M-1 standby inverter units as a main inverter unit to execute subsequent current output if the identification result is that the waveform diagram is abnormal. Therefore, the fault judgment is fast through the waveform diagram, the wave generation of the hot standby inverter unit is fast, the output power of the whole system is almost unchanged, and the heating process is not influenced. The reliability of the inversion part is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a voltage source type induction heating power supply system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of steps of a method for performing fault recognition on a waveform diagram of a current to obtain a recognition result according to the present application;
FIG. 3 is a schematic waveform diagram of the fluctuation threshold and the theoretical output current provided by the present application;
FIG. 4 is a flow chart of a fast fault identification method according to an embodiment of the present application;
fig. 5 is a schematic flow chart of a method for providing a voltage source type induction heating power supply according to an embodiment of the application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, system, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The following description will first be made of the relevant terms that the present application relates to.
SiC (silicon carbide) is a compound semiconductor material composed of Si (silicon) and C (carbon).
Referring to fig. 1, fig. 1 is a schematic structural diagram of a voltage source type induction heating power supply system according to the present application, as shown in fig. 1, the voltage source type induction heating power supply system includes: a rectifying device 10 and an inverter device 11, wherein the rectifying device 10 includes: n+1 active power correction units 100 connected in parallel, the rectifying device 10 being a rectifying device having an n+1 backup function and a high power factor rectifying function; the inverter device 11 includes: m inverter units 110 connected in parallel; the input port of the rectifying device 10 is connected with the power grid 13, the output port of the rectifying device 10 is connected with the input port of the inverter device 11, and the output port of the inverter device 11 is connected with the induction coil 14; when the system is in a normal working state, a main inverter unit in M parallel connected inverter units is in a normal output state, and M-1 standby inverter units are in a standby state; and each standby inverter unit in the M-1 standby inverter units is used for detecting the waveform diagram of the output current of the main inverter unit, performing fault identification on the waveform diagram of the current to obtain an identification result, and if the identification result is that the waveform diagram is abnormal, selecting one inverter unit from the M-1 standby inverter units as the main inverter unit to execute subsequent current output.
The above N, M is an integer greater than or equal to 2, and in practical applications, the size relationship between the above N, M may not be limited, i.e., N may be greater than M, or N may be equal to M, or N may be less than M.
Such standby states include, but are not limited to: a sleep backup state or a fast hot backup state.
The voltage source type induction heating power supply system provided by the technical scheme of the application comprises: a rectifying device and an inverter device, wherein the rectifying device includes: n+1 active power correction units connected in parallel, the inverter device includes: m inverter units connected in parallel; the input port of the rectifying device is connected with the power grid, the output port of the rectifying device is connected with the input port of the inversion device, and the output port of the inversion device is connected with the induction coil; when the system is in a normal working state, a main inverter unit in M parallel connected inverter units is in a normal output state, and M-1 standby inverter units are in a hot standby state; and each standby inverter unit in the M-1 standby inverter units is used for detecting a waveform diagram of output current, performing fault identification on the waveform diagram of the current to obtain an identification result, and selecting one inverter unit from the M-1 standby inverter units as a main inverter unit to execute subsequent current output if the identification result is that the waveform diagram is abnormal. Therefore, the fault judgment is fast through the waveform diagram, the wave generation of the hot standby inverter unit is fast, the output power of the whole system is almost unchanged, and the heating process is not influenced. The reliability of the inversion part is greatly improved.
For example, each of the n+1 active power correction units connected in parallel is used for parallel output voltage, so that stable dc bus voltage and output power can be provided for the subsequent stage (the rear part of the inverter device) if only 1 active power correction unit of the n+1 active power correction units is normal.
For example, the foregoing step of performing fault recognition on the current waveform may specifically include the following steps, as shown in fig. 2, fig. 2 is a schematic step diagram of a method for performing fault recognition on the current waveform, as shown in fig. 2, where the method specifically may include:
Step S201, obtain the output power P set of the system, calculate the expected amplitude I rms of the output current according to I rms=（Pset/Rload）1/2, where R load is the equivalent load resistance value of the induction coil.
The induction coil heats the workpiece.
Step S202, the frequency f and the phase theta of the output current of the phase-locked loop of the system are obtained.
Step S203, a theoretical waveform of the theoretical output current I out is calculated according to the expected amplitude I rms, the frequency f and the phase θ of the output current.
As shown in the formula: i out（t）=1.414×Irms ×sin (2×pi×f×t+θ); where t is the time variation of the theoretical waveform of I out and sin is the sine function.
And step S204, periodically collecting the actual output current of the main inversion unit, extracting the nth actual output current of the nth sampling time, calculating the nth theoretical output current of the nth sampling time, calculating the difference value between the nth actual output current and the nth theoretical output current to obtain the nth difference value, calculating the absolute value of the nth difference value to obtain the nth absolute value, recording an abnormality 1 time if the minimum value in the nth absolute value is larger than a fluctuation threshold value, and determining that the main inversion unit is abnormal and switching the standby inversion unit if the number of continuously recorded abnormalities exceeds an abnormality threshold value.
The nth theoretical output current for calculating the nth sampling time can be calculated by the above formula.
The fluctuation threshold can be set by a user, and can be shown in fig. 3, and fig. 3 is a schematic waveform diagram of the fluctuation threshold and the theoretical output current provided by the application.
The main control chip of the standby inverter unit can realize high-frequency sampling, so that the interval of each sampling time is very short, if the main inverter unit breaks down, the fluctuation of an output circuit is increased, in order to avoid the interference of noise signals, the absolute value of the difference value between the actual output current value of the nth sampling time and the theoretical output current of the nth sampling time is required to be larger than a fluctuation threshold value, the abnormality is recorded for 1 time, if the continuously recorded abnormal times exceed the abnormality threshold value, the main inverter unit is determined to be abnormal, the standby inverter unit is switched, the rapid response of the fault judging time can be ensured, the fault judging period is shortened, the continuously recorded abnormal times exceed the abnormality threshold value, the abnormal times recorded for a single sampling can be well filtered, the influence of noise signals on the abnormal condition judgment can be avoided, the abnormal rapid fault judgment is realized, the rapid fault judgment of the inverter unit can be realized, the rapid thermal backup of the inverter unit is realized, the fluctuation of the output power is very small in the period from the working state of the inverter in the thermal backup state to the starting working state, and the stability of the heating power supply system is further improved.
If M is greater than or equal to 3, the main inversion unit is used for selecting one standby inversion unit from M-1 standby inversion units as a secondary main inversion unit according to a preset rule, and adjusting the state of the secondary main inversion unit into a fast hot backup state, and the states of the remaining M-2 standby inversion units into a sleep backup state; the secondary main inversion unit is used for obtaining the output power P set of the system, and calculating the expected amplitude I rms of the output current according to I rms=（Pset/Rload）1/2, wherein R load is the equivalent load resistance value of the induction coil (namely heating the workpiece); acquiring the frequency f and the phase theta of the output current of the phase-locked loop; calculating a theoretical waveform of the theoretical output current I out according to the expected amplitude I rms, the frequency f and the phase theta of the output current; periodically collecting actual output current of a main inversion unit, extracting the nth actual output current of the nth sampling time, calculating the nth theoretical output current of the nth sampling time, calculating the difference value between the nth actual output current and the nth theoretical output current to obtain an nth difference value, calculating the absolute value of the nth difference value to obtain an nth absolute value, recording an abnormality 1 time if the minimum value in the nth absolute value is larger than a fluctuation threshold value, and determining that the main inversion unit is abnormal and switching a standby inversion unit if the number of continuously recorded abnormalities exceeds an abnormality threshold value; and the secondary main inversion unit is also used for selecting one standby inversion unit from the remaining M-2 standby inversion units as a secondary main inversion unit according to the preset rule when the main inversion unit is abnormal.
According to the technical scheme, when more than 3 inverter units are arranged, only one inverter unit is in the fast hot standby state, so that the calculation amount can be saved compared with the situation that all the standby inverter units are in the fast hot standby state, and the operation of the identification result is carried out by each inverter unit, so that a lot of repeated operation is increased. But this approach reduces accuracy because the single chip operation of the secondary main inverter unit may be subject to error.
If M is greater than or equal to 3, the main inversion unit is used for selecting one standby inversion unit from M-1 standby inversion units as a secondary main inversion unit according to a preset rule, and adjusting the state of the secondary main inversion unit into a fast hot backup state, and the states of the remaining M-2 standby inversion units into a sleep backup state;
The secondary main inversion unit is used for obtaining the output power P set of the system, and calculating the expected amplitude I rms of the output current according to I rms=（Pset/Rload）1/2, wherein R load is the equivalent load resistance value of the induction coil (namely heating the workpiece); acquiring the frequency f and the phase theta of the output current of the phase-locked loop; calculating a theoretical waveform of the theoretical output current I out according to the expected amplitude I rms, the frequency f and the phase theta of the output current; periodically collecting actual output current of a main inversion unit, sampling an actual output current every other sampling time, calculating a theoretical output current of one sampling time, calculating a difference value between the actual output current and the theoretical output current to obtain 1 difference value, adding 1 to an abnormal value b if the absolute value of the 1 difference value of a secondary main inversion unit is larger than a fluctuation threshold value, accumulating the abnormal value b if the absolute value of the difference value of continuous multiple sampling is larger than the fluctuation threshold value, and determining that the identification result is abnormal if the accumulated abnormal value b is larger than a quantity threshold value;
The secondary main inversion unit replaces the main inversion unit to execute subsequent current output, selects one standby inversion unit from the remaining M-2 standby inversion units as a secondary main inversion unit, and adjusts the state of the secondary main inversion unit into a quick hot standby state; if the abnormal value b is smaller than the quantity threshold value, determining that the identification result is normal, and continuously collecting the actual output current of the main inversion unit.
According to the technical scheme, the abnormal value is detected through the secondary main inversion unit, the total number of the abnormal detection values is counted, and when the total number is larger than the number threshold value, the identification result is determined to be abnormal.
For example, the main inversion unit is further configured to clear the abnormal value b when an absolute value of the difference value of the primary sampling is less than a fluctuation threshold. In the following, a technical scenario is described to explain the scheme of clearing the abnormal value b, where it is assumed that the initial value of b is 0, the absolute value of the difference value of the first sampling is greater than the fluctuation threshold value, b is increased by 1 from the initial value, the absolute value of the difference value of the second sampling is greater than the fluctuation threshold value, b is increased by 1 from 1 to 2 times again, the number threshold value is assumed to be 2, the absolute value of the difference value of the third sampling is greater than the fluctuation threshold value, b is increased by 1 to 3 times again, at this time, b is greater than the number threshold value 2, it is determined that the identification result is abnormal, and if the absolute value of the difference value of the third sampling is less than the fluctuation threshold value, b is not increased, and the value of b is cleared from 2.
The preset rule may be a preset rule customized by a manufacturer, for example, parameters such as response time, processing procedure, etc. are used as preset rules to screen the secondary main inversion unit.
Example 1
The first embodiment of the application provides a voltage source type induction heating power supply system which is mainly divided into three parts, a rectifying part, an inversion part and a heating coil.
For the rectifying part, the rectifying part of the first embodiment of the application is formed by connecting n+1 active power factor correction units in parallel, and has an n+1 backup function and a high power factor rectifying function. The reliability of the rectifying portion is greatly improved.
For the inversion part, the inversion part of the first embodiment of the application is formed by connecting M inversion units in parallel, and has a rapid hot backup function. By the rapid fault identification method, a rapid hot backup function is realized, the fluctuation of output power is small in a period from the occurrence of faults of the inverter in a working state to the start of working of the inverter in the hot backup state, and the reliability of an inversion part of the voltage source type induction heating power supply system is greatly improved.
Referring to fig. 4, fig. 4 is a flow chart of a fast fault identification method according to an embodiment of the present application, and the specific implementation manner is as follows.
S1, the rapid fault identification method is realized in a high-frequency timing sampling interrupt program, and after the system is powered on, the variables required by interrupt are initialized.
N is the nth sample in one switching period (output current ripple period), and n=0 is initialized. Alpha is the allowable range of the deviation of the actual output current from the theoretical output current. b is the number of consecutive times that the actual output current deviates from the theoretical output current by more than the allowable range, initializing b=0.
S2, high-frequency timing sampling interruption is entered, and the actual output current I out Actual practice is that of [ n ] at the time of the nth sampling point is acquired.
S3, calculating a theoretical output current theory during nth sampling.
And S4, obtaining the frequency f and the phase angle theta of the output current according to the phase-locked loop result.
S5, calculating N according to the time sampling interruption frequency and the frequency of the output current.
The above N is the number of sampling points corresponding to one output current period, and n=output current period/sampling period.
S6, calculating an effective value I rms of the output current according to the set output power P set and the load equivalent resistance R load of the known client.
Wherein, I rms=（Pset/Rload）1/2.
And S7, according to the calculation results of the steps S4, S5 and S6, deducing the theoretical output current in the nth sampling.
Wherein the theoretical output current I out（t）=1.414×Irms ×sin (2×pi×f×t+θ).
S8, judging whether the deviation of the I out Actual practice is that of [ n ] and the I out Theory of [ n ] is in an allowable range or not. If the deviation of I out Actual practice is that of n and I out Theory of n is within the tolerable range, b=0.
S9, if the deviation of I out Actual practice is that of [ n ] and I out Theory of [ n ] is not in the allowable range, then b is added with 1.
S10, judging whether b is not less than the maximum allowable continuous deviation times.
S11, if b is greater than or equal to the maximum allowable continuous deviation times, judging that the inverter in the current working state fails.
S12, the fault inverter (namely the main inverter) in the working state is shut down, and the inverter in the hot standby state is started.
S13, if b is smaller than the maximum allowable continuous deviation times, running a timing sampling interrupt once, and adding 1 to n.
S14, when N is larger than N, the next output current period is entered, and N is cleared and restarted.
S15, ending the nth time of the timing sampling interrupt program, and waiting for the next time of entering the timing sampling interrupt program.
The embodiment of the application also provides a voltage source type induction heating power supply method, referring to fig. 5, fig. 5 is a schematic flow diagram of the voltage source type induction heating power supply method provided by the embodiment of the application, the method is applied to a voltage source type induction heating power supply system, and the voltage source type induction heating power supply system comprises: the input port of rectifying device is connected with the electric wire netting, and the output port is connected inverting device's input port, inverting device's output port is connected induction coil, wherein, rectifying device includes: n+1 active power correction units connected in parallel, the inverter device including: m parallel-connected inverter units, the M parallel-connected inverter units comprising: 1 main inversion unit and M-1 standby inversion units; when the system is in a normal working state, the main inversion unit is in a normal output state, and the M-1 standby inversion units are in a standby state;
The method comprises the following steps:
Step S501, detecting a waveform diagram of the output current of the main inversion unit by M-1 standby inversion units;
Step S502, M-1 standby inverter units execute fault recognition on the waveform diagram of the current to obtain a recognition result, and if the recognition result is that the waveform diagram is abnormal, one inverter unit is selected from the M-1 standby inverter units as a main inverter unit to execute subsequent current output;
n, M are integers greater than or equal to 2.
For example, the performing fault recognition on the waveform diagram of the current to obtain a recognition result specifically includes: acquiring the output power of the system, and calculating the expected amplitude I rms of the output current according to I rms=（Pset/Rload）1/2; acquiring the frequency f and the phase theta of the output current of the system; calculating a theoretical waveform of the theoretical output current I out according to the expected amplitude I rms of the output current, the frequency f and the phase θ, as shown in the formula: i out（t）=1.414×Irms ×sin (2×pi×f×t+θ); periodically collecting actual output current of a main inversion unit, extracting an nth actual output current of an nth sampling time, calculating an nth theoretical output current of the nth sampling time according to the formula, calculating a difference value between the nth actual output current and the nth theoretical output current to obtain an nth difference value, calculating an absolute value of the nth difference value to obtain an nth absolute value, recording an abnormality 1 time if the minimum value in the nth absolute value is larger than a fluctuation threshold value, determining that the main inversion unit is abnormal if the continuously recorded abnormality times exceed an abnormality threshold value, and switching a standby inversion unit; wherein t is the time variation of the theoretical waveform of I out, and sin represents a sine function; r load is the equivalent load resistance value of the induction coil.
Illustratively, if M is greater than or equal to 3, the method further comprises: the main inversion unit selects one standby inversion unit from M-1 standby inversion units as a secondary main inversion unit according to a preset rule, the state of the secondary main inversion unit is adjusted to be a fast hot backup state, and the states of the remaining M-2 standby inversion units are adjusted to be a sleep backup state; each standby inverter unit in the M-1 standby inverter units is specifically configured to obtain output power of the system, and calculate an expected amplitude I rms of the output current according to I rms=（Pset/Rload）1/2; acquiring the frequency f and the phase theta of the output current of the system; calculating a theoretical waveform of the theoretical output current I out according to the expected amplitude I rms of the output current, the frequency f and the phase θ, as shown in the formula: i out（t）=1.414×Irms ×sin (2×pi×f×t+θ); periodically collecting actual output current of a main inversion unit, extracting an nth actual output current of an nth sampling time, calculating an nth theoretical output current of the nth sampling time according to the formula, calculating a difference value between the nth actual output current and the nth theoretical output current to obtain an nth difference value, calculating an absolute value of the nth difference value to obtain an nth absolute value, recording an abnormality 1 time if the minimum value in the nth absolute value is larger than a fluctuation threshold value, determining that the main inversion unit is abnormal if the continuously recorded abnormality times exceed an abnormality threshold value, and switching a standby inversion unit; wherein t is the time variation of the theoretical waveform of I out, and sin represents a sine function; r load is the equivalent load resistance value of the induction coil; and when the identification result is abnormal, the secondary main inversion unit selects one standby inversion unit from the remaining M-2 standby inversion units according to the preset rule to serve as a secondary main inversion unit.
Illustratively, if M is greater than or equal to 3, the method further comprises: the main inversion unit selects one standby inversion unit from M-1 standby inversion units as a secondary main inversion unit according to a preset rule, the state of the secondary main inversion unit is adjusted to be a fast hot backup state, and the states of the remaining M-2 standby inversion units are adjusted to be a sleep backup state; the secondary main inversion unit obtains the output power of the system, and calculates the expected amplitude I rms of the output current according to I rms=（Pset/Rload）1/2, wherein R load is the equivalent load resistance value of the induction coil; acquiring the frequency f and the phase theta of the output current of the phase-locked loop; calculating a theoretical waveform of the theoretical output current I out according to the expected amplitude I rms, the frequency f and the phase theta of the output current; periodically collecting actual output current of a main inversion unit, sampling an actual output current every other sampling time, calculating a theoretical output current of one sampling time, calculating a difference value between the actual output current and the theoretical output current to obtain 1 difference value, adding 1 to an abnormal value b if the absolute value of the 1 difference value of a secondary main inversion unit is larger than a fluctuation threshold value, accumulating the abnormal value b if the absolute value of the difference value of continuous multiple sampling is larger than the fluctuation threshold value, and determining that the identification result is abnormal if the accumulated abnormal value b is larger than a quantity threshold value; the secondary main inversion unit is replaced by the main inversion unit to execute subsequent current output, one standby inversion unit is selected from the remaining M-2 standby inversion units to serve as a secondary main inversion unit, and the state of the secondary main inversion unit is adjusted to be a quick hot standby state; if the abnormal value b is smaller than the quantity threshold value, determining that the identification result is normal, and continuously collecting the actual output current of the main inversion unit.
The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired or wireless means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more sets of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.
The embodiment of the application also provides a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program makes a computer execute part or all of the steps of any one of the above method embodiments, and the computer includes an electronic device.
Embodiments of the present application also provide a computer program product comprising a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform part or all of the steps of any one of the methods described in the method embodiments above. The computer program product may be a software installation package, said computer comprising an electronic device.
It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.
In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus and system may be implemented in other manners. For example, the device embodiments described above are merely illustrative; for example, the division of the units is only one logic function division, and other division modes can be adopted in actual implementation; for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may be physically included separately, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: u disk, removable hard disk, magnetic disk, optical disk, volatile memory or nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an erasable programmable ROM (erasable PROM), an electrically erasable programmable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as external cache memory. By way of example, and not limitation, many forms of random access memory (random access memory, RAM) are available, such as static random access memory (STATIC RAM, SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate synchronous dynamic random access memory (double DATA RATE SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (ENHANCED SDRAM, ESDRAM), synchronous link dynamic random access memory (SYNCHLINK DRAM, SLDRAM), and direct memory bus random access memory (direct rambus RAM, DR RAM). Etc. various media in which program code may be stored.
Although the present invention is disclosed above, the present invention is not limited thereto. Variations and modifications, including combinations of the different functions and implementation steps, as well as embodiments of the software and hardware, may be readily apparent to those skilled in the art without departing from the spirit and scope of the invention.
Claims (8)
1. A voltage source type induction heating power supply system, the voltage source type induction heating power supply system comprising: the input port of the rectifying device is connected with a power grid, the output port of the rectifying device is connected with the input port of the inverting device, the output port of the inverting device is connected with the induction coil,
The rectifying device includes: the input and parallel output of the N+1 active power factor correction units are connected in parallel, and the rectifying device is a rectifying device with an N+1 backup function and a high power factor rectifying function; the inverter device includes: an inverter unit with M input-parallel output parallel connections, the inverter unit with M input-parallel output parallel connections comprising: 1 main inversion unit and M-1 standby inversion units; wherein,
When the system is in a normal working state, the main inversion unit is in a normal output state, and all the M-1 standby inversion units are in a rapid hot standby state;
The M-1 standby inverter units are used for detecting the waveform diagram of the output current of the main inverter unit, performing fault identification on the waveform diagram of the output current to obtain an identification result, and if the identification result is that the waveform diagram is abnormal, selecting one inverter unit from the M-1 standby inverter units as the main inverter unit to perform subsequent current output;
N, M are integers greater than or equal to 2;
Each standby inverter unit of the M-1 standby inverter units is specifically configured to obtain output power P set of the system, and calculate an expected amplitude I rms of the output current according to I rms=（Pset/Rload）1/2; acquiring the frequency f and the phase theta of the output current of a phase-locked loop of the system; calculating a theoretical waveform of a theoretical output current I out (t) according to the expected amplitude I rms of the output current, the frequency f and the phase theta, wherein a theoretical waveform formula of the theoretical output current I out (t) is as follows:
I out（t）=1.414×Irms ×sin (2×pi×f×t+θ); periodically collecting actual output current of a main inversion unit, extracting the nth actual output current of the nth sampling time, calculating the nth theoretical output current of the nth sampling time according to a theoretical waveform formula of the theoretical output current I out (t), calculating a difference value between the nth actual output current and the nth theoretical output current to obtain an nth difference value, recording an abnormality 1 time if the absolute value of the nth difference value is larger than a fluctuation threshold value, determining that the main inversion unit is abnormal if the number of continuously recorded abnormalities exceeds an abnormality threshold value, and selecting one inversion unit from the M-1 standby inversion units as the main inversion unit to execute subsequent current output; wherein t is the time variation of the theoretical waveform of I out, sin is a sine function, and R load is the equivalent load resistance value of the induction coil.
2. The voltage-source type induction heating power supply system according to claim 1, wherein if M.gtoreq.3,
When the system is in a normal working state, the main inversion unit is in a normal output state, and the M-1 standby inversion units are not all in a rapid hot standby state; the main inversion unit is used for selecting one standby inversion unit from M-1 standby inversion units as a secondary main inversion unit according to a preset rule, adjusting the state of the secondary main inversion unit into a rapid hot backup state, and adjusting the states of the remaining M-2 standby inversion units into a sleep backup state;
The secondary main inversion unit in a rapid hot standby state is used for acquiring the output power P set of the system and calculating the expected amplitude I rms of the output current according to I rms=（Pset/Rload）1/2; acquiring the frequency f and the phase theta of the output current of a phase-locked loop of the system; the method comprises the steps of periodically collecting actual output current of a main inversion unit, extracting the nth actual output current of an nth sampling time, calculating the nth theoretical output current of the nth sampling time according to a theoretical waveform formula of theoretical output current I out (t), calculating a difference value between the nth actual output current and the nth theoretical output current to obtain an nth difference value, recording abnormality for 1 time if the absolute value of the nth difference value is larger than a fluctuation threshold value, determining that the main inversion unit is abnormal if the number of continuously recorded abnormalities exceeds an abnormality threshold value, replacing the main inversion unit by a secondary main inversion unit to execute subsequent current output, and selecting a standby inversion unit from the remaining M-2 standby inversion units as a secondary main inversion unit according to the preset rule.
3. The voltage-source type induction heating power supply system according to claim 1, wherein if M.gtoreq.3,
When the system is in a normal working state, the main inversion unit is in a normal output state, and the M-1 standby inversion units are not all in a rapid hot standby state; the main inversion unit is used for selecting one standby inversion unit from M-1 standby inversion units as a secondary main inversion unit according to a preset rule, adjusting the state of the secondary main inversion unit into a rapid hot backup state, and adjusting the states of the remaining M-2 standby inversion units into a sleep backup state;
The secondary main inversion unit in a rapid hot standby state is used for obtaining the output power P set of the system, calculating the expected amplitude I rms of the output current according to I rms=（Pset/Rload）1/2 and obtaining the frequency f and the phase theta of the output current of a phase-locked loop of the system; periodically collecting actual output current of a main inversion unit, sampling an actual output current every other sampling time, calculating a theoretical output current corresponding to the sub-sampling according to a theoretical waveform formula of the theoretical output current I out (t), calculating a difference value of the actual output current and the theoretical output current of the sub-sampling to obtain 1 difference value, adding 1 to an abnormal value b if the absolute value of the 1 difference value is larger than a fluctuation threshold value, accumulating the abnormal value b if the absolute value of the difference value of the continuous multi-sampling is larger than the fluctuation threshold value, determining that the identification result is abnormal if the accumulated abnormal value b is larger than a quantity threshold value, replacing the main inversion unit by a sub-main inversion unit to execute subsequent current output, selecting a standby inversion unit from the residual M-2 standby inversion units as a sub-main inversion unit, and adjusting the state of the selected sub-main inversion unit into a rapid hot standby state; if the abnormal value b is smaller than the quantity threshold value, determining that the identification result is normal, and continuously collecting the actual output current of the main inversion unit.
4. A voltage source type induction heating power supply system according to claim 3, wherein,
And the main inversion unit is also used for clearing the abnormal value b when the absolute value of the difference value of one sampling is smaller than the fluctuation threshold value.
5. A voltage source type induction heating power supply method applied to the voltage source type induction heating power supply system of claim 1, the voltage source type induction heating power supply system comprising: the rectifier device and inverter device, rectifier device's input port is connected with the electric wire netting, and the output port is connected inverter device's input port, inverter device's output port is connected induction coil, its characterized in that, rectifier device includes: the input and parallel output of the N+1 active power factor correction units are connected in parallel, and the rectifying device is a rectifying device with an N+1 backup function and a high power factor rectifying function; the inverter device includes: an inverter unit with M input-parallel output parallel connections, the inverter unit with M input-parallel output parallel connections comprising: 1 main inversion unit and M-1 standby inversion units; the method comprises the following steps:
when the system is in a normal working state, the main inversion unit is in a normal output state, and all the M-1 standby inversion units are in a rapid hot standby state;
the M-1 standby inverter units detect the waveform diagram of the output current of the main inverter unit, perform fault identification on the waveform diagram of the output current to obtain an identification result, and select one inverter unit from the M-1 standby inverter units as the main inverter unit to perform subsequent current output if the identification result is that the waveform diagram is abnormal;
N, M are integers greater than or equal to 2; the step of performing fault recognition on the waveform diagram of the output current to obtain a recognition result specifically comprises the following steps: each standby inverter unit in the M-1 standby inverter units acquires output power P set of the system, and calculates expected amplitude I rms of output current according to I rms=（Pset/Rload）1/2; acquiring the frequency f and the phase theta of the output current of a phase-locked loop of the system; calculating a theoretical waveform of a theoretical output current I out (t) according to the expected amplitude I rms of the output current, the frequency f and the phase theta, wherein a theoretical waveform formula of the theoretical output current I out (t) is as follows:
I out（t）=1.414×Irms ×sin (2×pi×f×t+θ); periodically collecting actual output current of a main inversion unit, extracting the nth actual output current of the nth sampling time, calculating the nth theoretical output current of the nth sampling time according to a theoretical waveform formula of the theoretical output current I out (t), calculating a difference value between the nth actual output current and the nth theoretical output current to obtain an nth difference value, recording an abnormality 1 time if the absolute value of the nth difference value is larger than a fluctuation threshold value, determining that the main inversion unit is abnormal if the number of continuously recorded abnormalities exceeds an abnormality threshold value, and selecting one inversion unit from the M-1 standby inversion units as the main inversion unit to execute subsequent current output; wherein t is the time variation of the theoretical waveform of I out, sin is a sine function, and R load is the equivalent load resistance value of the induction coil.
6. The method of claim 5, wherein if M is greater than or equal to 3, the method further comprises:
When the system is in a normal working state, the main inversion unit is in a normal output state, and the M-1 standby inversion units are not all in a rapid hot standby state; the main inversion unit is used for selecting one standby inversion unit from M-1 standby inversion units as a secondary main inversion unit according to a preset rule, adjusting the state of the secondary main inversion unit into a rapid hot backup state, and adjusting the states of the remaining M-2 standby inversion units into a sleep backup state;
The secondary main inversion unit in the rapid hot standby state obtains the output power P set of the system, and calculates the expected amplitude I rms of the output current according to I rms=（Pset/Rload）1/2; acquiring the frequency f and the phase theta of the output current of a phase-locked loop of the system; the method comprises the steps of periodically collecting actual output current of a main inversion unit, extracting the nth actual output current of an nth sampling time, calculating the nth theoretical output current of the nth sampling time according to a theoretical waveform formula of theoretical output current I out (t), calculating a difference value between the nth actual output current and the nth theoretical output current to obtain an nth difference value, recording abnormality for 1 time if the absolute value of the nth difference value is larger than a fluctuation threshold value, determining that the main inversion unit is abnormal if the number of continuously recorded abnormalities exceeds an abnormality threshold value, replacing the main inversion unit by a secondary main inversion unit to execute subsequent current output, and selecting a standby inversion unit from the remaining M-2 standby inversion units as a secondary main inversion unit according to the preset rule.
7. The method of claim 5, wherein if M is greater than or equal to 3, the method further comprises:
When the system is in a normal working state, the main inversion unit is in a normal output state, and the M-1 standby inversion units are not all in a rapid hot standby state; the main inversion unit is used for selecting one standby inversion unit from M-1 standby inversion units as a secondary main inversion unit according to a preset rule, adjusting the state of the secondary main inversion unit into a rapid hot backup state, and adjusting the states of the remaining M-2 standby inversion units into a sleep backup state;
The secondary main inversion unit in a rapid hot standby state is used for obtaining the output power P set of the system, calculating the expected amplitude I rms of the output current according to I rms=（Pset/Rload）1/2 and obtaining the frequency f and the phase theta of the output current of a phase-locked loop of the system; periodically collecting actual output current of a main inversion unit, sampling an actual output current every other sampling time, calculating a theoretical output current corresponding to the sub-sampling according to a theoretical waveform formula of the theoretical output current I out (t), calculating a difference value of the actual output current and the theoretical output current of the sub-sampling to obtain 1 difference value, adding 1 to an abnormal value b if the absolute value of the 1 difference value is larger than a fluctuation threshold value, accumulating the abnormal value b if the absolute value of the difference value of the continuous multi-sampling is larger than the fluctuation threshold value, determining that the identification result is abnormal if the accumulated abnormal value b is larger than a quantity threshold value, replacing the main inversion unit by a sub-main inversion unit to execute subsequent current output, selecting a standby inversion unit from the residual M-2 standby inversion units as a sub-main inversion unit, and adjusting the state of the selected sub-main inversion unit into a rapid hot standby state; if the abnormal value b is smaller than the quantity threshold value, determining that the identification result is normal, and continuously collecting the actual output current of the main inversion unit.
8. A computer readable storage medium, characterized in that a computer program is stored, wherein the computer program causes a computer to execute instructions of steps in the method according to any one of claims 5-7.
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