CN112803719B - Frequency converter modulation method and device, frequency converter and computer storage medium - Google Patents
Frequency converter modulation method and device, frequency converter and computer storage medium Download PDFInfo
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- CN112803719B CN112803719B CN202110125876.9A CN202110125876A CN112803719B CN 112803719 B CN112803719 B CN 112803719B CN 202110125876 A CN202110125876 A CN 202110125876A CN 112803719 B CN112803719 B CN 112803719B
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- 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
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Abstract
The embodiment of the application provides a modulation method and device of a frequency converter, the frequency converter and a computer storage medium. The method comprises the following steps: acquiring a set frequency corresponding to the output frequency of the frequency converter; setting a working mode according to the relationship between the set frequency and the preset maximum frequency and the preset minimum frequency, so that the switching frequency of a power device of the frequency converter is adapted to the actual situation, and the actual requirements of users are met; in the high-frequency control mode, determining the maximum output frequency of the frequency converter in the high-frequency motor parameter group according to the relationship between the maximum frequency in the actual working frequency of the frequency converter and the maximum rated output frequency of the frequency converter, wherein the frequency converter operates by using a higher PWM carrier frequency to prevent the power device of the frequency converter from being damaged; and when in the normal control mode, the maximum output frequency of the frequency converter in the normal motor parameter group is set to be less than or equal to the frequency corresponding to the PWM carrier frequency conversion point, so that the frequency converter runs at the lowest carrier frequency, and unnecessary switching loss of a power device of the frequency converter is reduced.
Description
Technical Field
The embodiment of the application relates to the technical field of frequency converters, in particular to a modulation method and device of a frequency converter, the frequency converter and a computer storage medium.
Background
With the development of the frequency converter (VFD) technology, the frequency converter is widely applied in the industries of chemical fiber, textile, steel, machinery, paper making and the like, the frequency converter needs to output higher frequency in some application occasions, for example, the winding process may need the output frequency of the frequency converter to reach 100Hz, after the output frequency of the frequency converter is increased to a certain value, the Modulation frequency of Pulse Width Modulation (PWM) is correspondingly increased, for example, the Modulation frequency is increased from 1.25KHz to 2.5KHz initially, and the Modulation frequency after PWM is increased is continuously in the whole output frequency process of the frequency converter, even if the output frequency of the frequency converter is lowered, the PWM Modulation frequency is still 2.5 KHz. Under the condition, the switching loss of a power device of the frequency converter is increased sharply due to the increase of the modulation times in unit time, so that the power device generates heat abnormally, the service life of the power device is shortened, and hidden troubles are buried for the damage of the frequency converter.
In the prior art, a capacity reduction mode is generally adopted, that is, when the type of a frequency converter is selected, the frequency converter with higher power is selected to reduce the load of the frequency converter and meet the capacity reduction requirement.
However, the selection of a frequency converter with a large power by the capacity reduction mode cannot meet the actual requirements of users, increases the system cost, and reduces the user experience.
Disclosure of Invention
In view of the above, one of the technical problems solved by the embodiments of the present application is to provide a modulation method and apparatus for a frequency converter, and a computer storage medium, so as to overcome the defects that in the prior art, a capacity reduction method is adopted to select a frequency converter, the system cost is increased, and the user experience is reduced.
In a first aspect, an embodiment of the present application provides a modulation method for a frequency converter, where the method includes: acquiring a set frequency corresponding to the output frequency of the frequency converter; determining a working mode of the frequency converter according to the relationship between the set frequency and a preset maximum frequency and a preset minimum frequency, wherein the working mode comprises a high-frequency control mode and a conventional control mode; in the high-frequency control mode, determining the maximum output frequency of the frequency converter in the high-frequency motor parameter group according to the relationship between the maximum frequency in the actual working frequency of the frequency converter and the maximum rated output frequency of the frequency converter; and in the normal control mode, the maximum output frequency of the frequency converter in the normal motor parameter group is set to be less than or equal to the frequency corresponding to the PWM carrier frequency conversion point, and the PWM carrier frequency conversion point comprises a conversion point corresponding to the maximum value of the PWM carrier frequency and a conversion point corresponding to the minimum value of the PWM carrier frequency.
Optionally, determining the operating mode of the frequency converter according to the relationship between the set frequency and a preset maximum frequency and a preset minimum frequency includes: if the set frequency is greater than the preset maximum frequency, setting the working mode of the frequency converter as the high-frequency control mode, and setting the motor parameter group of the frequency converter as the high-frequency motor parameter group; if the set frequency is less than or equal to the preset minimum frequency, setting the working mode of the frequency converter as the conventional control mode, and setting the motor parameter group of the frequency converter as the conventional motor parameter group; and if the set frequency is greater than the preset minimum frequency and less than or equal to the preset maximum frequency, automatically controlling the frequency converter according to the conventional control mode.
Optionally, determining the maximum output frequency of the frequency converter in the high-frequency motor parameter set according to a relationship between the maximum frequency in the actual operating frequencies of the frequency converter and the maximum rated output frequency of the frequency converter includes: if the maximum rated output frequency of the frequency converter is greater than the maximum frequency in the actual working frequencies of the frequency converter, setting the maximum output frequency of the frequency converter as the maximum frequency in the actual working frequencies of the frequency converter; and if the maximum rated output frequency of the frequency converter is less than or equal to the maximum frequency in the actual working frequency of the frequency converter, setting the maximum output frequency of the frequency converter as the maximum rated output frequency of the frequency converter.
Optionally, the method further comprises: when the working mode of the frequency converter is the high-frequency control mode, judging whether the set frequency corresponding to the output frequency of the frequency converter is less than or equal to a preset minimum frequency; and if the set frequency is less than or equal to the preset minimum frequency, switching the motor parameter group of the frequency converter from the high-frequency motor parameter group to the conventional motor parameter group.
Optionally, if the set frequency is less than or equal to the preset minimum frequency, switching the set of motor parameters of the frequency converter from the set of high-frequency motor parameters to the set of regular motor parameters includes: when the set frequency is less than or equal to the preset minimum frequency, timing is started to obtain the working time length of the frequency converter under the set frequency; judging whether the working time of the frequency converter under the set frequency is less than or equal to the delay time or not, if the working time of the frequency converter under the set frequency is less than or equal to the delay time, the motor parameter group of the frequency converter is consistent with the current motor parameter group; and if the working time of the frequency converter under the set frequency is longer than the delay time, switching the motor parameter group of the frequency converter from the high-frequency motor parameter group to the conventional motor parameter group.
Optionally, after setting the set of motor parameters of the frequency converter to the set of high frequency motor parameters, the method further comprises: acquiring a first switching frequency of the frequency converter after the motor parameter group is switched to the high-frequency motor parameter group; and if the first switching frequency is less than the maximum output frequency of the frequency converter in the high-frequency motor parameter group, keeping the motor parameter group of the frequency converter in the high-frequency motor parameter group.
Optionally, after setting the set of motor parameters of the frequency converter to the set of regular motor parameters, the method further comprises: acquiring a second switching frequency of the frequency converter after the motor parameter group is switched to the conventional motor parameter group; and if the second switching frequency is greater than the maximum output frequency of the frequency converter in the regular motor parameter group, keeping the motor parameter group of the frequency converter in the regular motor parameter group.
In a second aspect, an embodiment of the present application provides a frequency converter modulation apparatus; the acquisition module is used for acquiring a set frequency corresponding to the output frequency of the frequency converter; the working mode determining module is used for determining the working mode of the frequency converter according to the relationship between the set frequency and a preset maximum frequency and a preset minimum frequency, wherein the working mode comprises a high-frequency control mode and a conventional control mode; the high-frequency control module is used for determining the maximum output frequency of the frequency converter in the high-frequency motor parameter group according to the relationship between the maximum frequency in the actual working frequency of the frequency converter and the maximum rated output frequency of the frequency converter in the high-frequency control mode; and the conventional control module is used for setting the maximum output frequency of the frequency converter in the conventional motor parameter group to be less than or equal to the frequency corresponding to the PWM carrier frequency conversion point in the conventional control mode, and the PWM carrier frequency conversion point comprises a conversion point corresponding to the maximum value of the PWM carrier frequency and a conversion point corresponding to the minimum value of the PWM carrier frequency.
In a third aspect, an embodiment of the present application provides a frequency converter, including a comparing unit, an RS trigger, and a switching unit; the comparison unit comprises a first comparator and a second comparator, the first comparator is used for comparing a set frequency corresponding to the output frequency of the frequency converter with a preset maximum frequency, the output end of the first comparator is electrically connected with the set end of the RS trigger, and the set end receives the comparison result of the first comparator; the second comparator is used for comparing a set frequency corresponding to the output frequency of the frequency converter with a preset minimum frequency, the output end of the second comparator is electrically connected with the reset end of the RS trigger, and the reset end receives the comparison result of the second comparator; the output end of the RS trigger is electrically connected with the input end of the switching unit, and the switching unit switches the motor parameter set of the frequency converter according to the output result of the RS trigger.
Optionally, a time delay is further included; the input end of the time delay unit is electrically connected with the output end of the second comparator, the output end of the time delay unit is electrically connected with the reset end of the RS trigger, and the time delay unit is used for delaying the comparison result of the second comparator.
Optionally, the device further comprises an enabling unit, wherein the enabling unit comprises a first enabling unit and a second enabling unit; a first switching output end of the switching unit is electrically connected with the first enabling unit, and the first enabling unit is used for triggering a conventional motor parameter group of the frequency converter; and a second switching output end of the switching unit is electrically connected with the second enabling unit, and the second enabling unit is used for triggering a high-frequency motor parameter group of the frequency converter.
In a fourth aspect, the present application provides a computer storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the modulation method of the frequency converter as described in the first aspect or any one of the embodiments of the first aspect.
The embodiment of the application provides a modulation method and device of a frequency converter, the frequency converter and a computer storage medium. The modulation method of the frequency converter comprises the following steps: acquiring a set frequency corresponding to the output frequency of the frequency converter; determining the working mode of the frequency converter according to the relationship between the set frequency and the preset maximum frequency and the preset minimum frequency, wherein the working mode comprises a high-frequency control mode and a conventional control mode; in a high-frequency control mode, determining the maximum output frequency of the frequency converter in a high-frequency motor parameter group according to the relationship between the maximum frequency in the actual working frequency of the frequency converter and the maximum rated output frequency of the frequency converter, and setting the motor parameter group of the frequency converter as the high-frequency motor parameter group, so that the frequency converter runs by using a higher PWM carrier frequency, and the switch of a power device of the frequency converter is prevented from being damaged; in a conventional control mode, the output frequency of the frequency converter is indicated to be less than or equal to the frequency corresponding to the PWM carrier frequency conversion point, that is, the maximum output frequency of the current frequency converter does not need to be set to be very large, the motor parameter group of the frequency converter is set to be a conventional motor parameter group, the maximum output frequency of the frequency converter in the conventional motor parameter group is set to be less than or equal to the frequency corresponding to the PWM carrier frequency conversion point, and the PWM carrier frequency conversion point comprises a conversion point corresponding to the maximum value of the PWM carrier frequency and a conversion point corresponding to the minimum value of the PWM carrier frequency, so that the frequency converter operates at the lowest carrier frequency, and unnecessary switching loss of a power device of the frequency converter is reduced. According to the embodiment of the application, the high-frequency control mode and the conventional control mode are set according to the relation between the set frequency and the preset maximum frequency and the preset minimum frequency, so that the switching frequency of a power device of the frequency converter is adaptive to the actual condition of the power device, the actual requirement of a user is met, and the user experience is improved.
Drawings
Some specific embodiments of the present application will be described in detail below by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a flowchart of a modulation method of a frequency converter according to an embodiment of the present disclosure;
fig. 2 is a modulation result of a frequency converter in the prior art according to an embodiment of the present application;
fig. 3 is a modulation result of a frequency converter according to an embodiment of the present application;
fig. 4 is a schematic diagram of a modulation apparatus of a frequency converter according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a frequency converter according to an embodiment of the present application;
fig. 6 is a schematic diagram of another frequency converter provided in an embodiment of the present application;
fig. 7 is a schematic diagram of another frequency converter according to an embodiment of the present application.
List of reference numerals:
101: acquiring a set frequency corresponding to the output frequency of the frequency converter;
102: determining the working mode of the frequency converter according to the relationship between the set frequency and the preset maximum frequency and the preset minimum frequency, wherein the working mode comprises a high-frequency control mode and a conventional control mode;
103: in the high-frequency control mode, determining the maximum output frequency of the frequency converter in the high-frequency motor parameter group according to the relationship between the maximum frequency in the actual working frequency of the frequency converter and the maximum rated output frequency of the frequency converter;
104: in a conventional control mode, setting the maximum output frequency of a frequency converter in the conventional motor parameter group to be less than or equal to the frequency corresponding to the PWM carrier frequency conversion point, wherein the PWM carrier frequency conversion point comprises a conversion point corresponding to the maximum value of the PWM carrier frequency and a conversion point corresponding to the minimum value of the PWM carrier frequency;
40: a frequency converter modulation device;
401: an acquisition module;
402: a working mode determining module;
403: a high frequency control module;
404: a conventional control module;
50: a frequency converter;
502: a comparison unit;
5021: a first comparator;
5022: a second comparator;
503: a time delay;
504: an RS trigger;
506: a switching unit;
508: an enabling unit;
5081: a first enabling unit;
5082: a second enabling unit.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the embodiments of the present application, 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 a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application shall fall within the scope of the protection of the embodiments in the present application.
It should be noted that the first and second in this application are only used for distinguishing names, do not represent order relationships, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, for example, the first user, the second user, the third user, just for distinguishing different users.
The following further describes specific implementations of embodiments of the present application with reference to the drawings of the embodiments of the present application.
An embodiment of the present application provides a modulation method of a frequency converter, and fig. 1 is a flowchart of the modulation method of the frequency converter provided in the embodiment of the present application, and as shown in fig. 1, the method includes the following steps:
step 101: and acquiring a set frequency corresponding to the output frequency of the frequency converter.
During the operation of the frequency converter, the output frequency of the frequency converter is obtained in real time, and the set frequency corresponding to the frequency converter is obtained according to the output frequency of the frequency converter, and during the actual operation, under a certain set frequency, the output frequency of the frequency converter is less than or equal to the corresponding set frequency, for example, the set frequency is 100Hz, and the output frequency of the frequency converter may be 96Hz, or 95Hz, and the like. According to the embodiment of the application, after the output frequency of the frequency converter is obtained, the set frequency of the frequency converter is also obtained, so that the accuracy of determining the working mode by using the relation between the set frequency and the preset minimum frequency and the preset maximum frequency is improved.
In order to facilitate understanding of the operation mode of the frequency converter, the embodiment of the present application further shows a rated output current of the frequency converter at a set pulse frequency, as shown in table 1, where table 1 provides an operation parameter of the frequency converter provided in the embodiment of the present application.
TABLE 1
Illustratively, the frequency converter in table 1 is exemplarily illustrated as SINAMICS G130 frequency converter, and table 1 shows the operating parameters of the power supply level of the frequency converter at 400V, it is understood that the power supply level can also be 500V and 690V, table 1 is merely illustrated as the example of the power supply level at 400V, the power supply includes a 380V-480V power supply interval, and in a 380V-480V power supply interval, the output frequency of the frequency converter includes 110kW, 132kW, 160kW, 200kW, 250kW, 315kW, 400kW, 450kW and 560kW, the PWM setting pulse frequency of the frequency converter includes 1.25kHz and 2.0kHz, and the higher pulse frequency of the PWM of the frequency converter includes 2.5kHz, 4.0kHz, 5.0kHz, 5.5kHz and 8.0 kHz. Table 1 also shows a rated output current and a current capacity reduction factor of the inverter at the PWM set pulse frequency, taking the output frequency of 315kW as an example, when the pulse frequency of the inverter is set to 1.25kHz, the output current is 605A, and when the pulse frequency of the PWM set pulse frequency is 2.0kHz, the capacity reduction factor is 83%, and the output current is 605A × 83% — 502A; taking the output frequency of 110kW as an example, when the PWM higher pulse frequency of the frequency converter is 2.5kHz, the capacity reduction factor is 95%, and the output current is 210A
When the PWM high pulse frequency is 5.0kHz, the capacity reduction factor of the frequency converter is 54 percent, and the output current is 210A multiplied by 54 percent to 155A. The capacitance reduction factor in the frequency converter in table 1 is that the motor may have noise during the operation of the frequency converter, and this condition can be improved by increasing the pulse frequency, and after the pulse frequency is increased, the output current of the frequency converter does not reach the rated current 210A, so the capacitance reduction is considered, so that the motor is in a normal operation state, and the reliability of the power components is improved.
Step 102: and determining the working modes of the frequency converter according to the relationship between the set frequency and the preset maximum frequency and the preset minimum frequency, wherein the working modes comprise a high-frequency control mode and a conventional control mode.
It should be noted that, in the prior art, in the conventional case, when the maximum output frequency of the frequency converter is greater than 100Hz, the PWM modulation frequency is increased accordingly, even if the output frequency of the frequency converter is decreased, the PWM modulation frequency is still executed according to the maximum output frequency limit value, that is, the maximum output frequency limit value of the PWM modulation frequency is not allowed to be adjusted during the use of the frequency converter until the operation of the frequency converter is finished. As shown in fig. 2, fig. 2 is a modulation result of a frequency converter in the prior art according to an embodiment of the present application, in fig. 2, an abscissa is an operating time of the frequency converter and a PWM modulation frequency, the operating times of the frequency converter and the PWM modulation frequency are synchronized, an ordinate is an output frequency VFD output frequency in Hz, and a PWM modulation frequency Pulse frequency in kHz, and since a maximum output frequency of the frequency converter is 120Hz and greater than 100Hz, the PWM modulation frequency is 2.5kHz between time points t1-t4, even though the maximum output frequency of the frequency converter is less than or equal to 100Hz between time points t1-t2 and time points t3-t4, the PWM modulation frequency is still 2.5 kHz. Under the condition, the switching loss of a power device of the frequency converter is increased sharply due to the increase of the modulation times in unit time, so that the power device generates heat abnormally, the service life of the power device is shortened, and hidden troubles are buried for the damage of the frequency converter.
In an implementation manner, the PWM modulation scheme may be set as an edge modulation mode, where the edge modulation mode is a vector modulation mode, and generally, the PWM modulation scheme modulates the frequency converter in the whole period, that is, the pulses are of equal amplitude and different width, that is, the pulse amplitudes are the same, and the pulse widths are different (that is, the on-times of the pulse waves are different); in the edge modulation mode, the frequency converter is not modulated in the middle time period of the whole period (i.e. the pulse wave is always in the on mode), and the frequency converter is modulated only in the set time periods at the two ends of the edge of the whole period. However, this edge modulation mode can cause the output voltage edge of the frequency converter to spike, thereby generating shaft currents in the motor, and in some unfavorable cases, these current peaks are high, which can also cause the motor bearing to be damaged, and reduce the reliability of the frequency converter.
According to the embodiment of the application, the high-frequency control mode and the conventional control mode are set according to the relationship between the set frequency corresponding to the output frequency of the frequency converter and the preset maximum frequency and the preset minimum frequency, so that the switching frequency of a power device of the frequency converter is adaptive to the actual condition of the power device, the actual requirement of a user is met, and the user experience is improved.
Step 103: and in the high-frequency control mode, determining the maximum output frequency of the frequency converter in the high-frequency motor parameter group according to the relation between the maximum frequency in the actual working frequency of the frequency converter and the maximum rated output frequency of the frequency converter.
And in the high-frequency control mode, setting the motor parameter group of the frequency converter as a high-frequency motor parameter group, wherein the frequency converter operates in the high-frequency motor parameter group, and the maximum output frequency of the frequency converter in the high-frequency motor parameter group is determined according to the relationship between the maximum frequency in the actual working frequency of the frequency converter and the maximum rated output frequency of the frequency converter, so that the maximum output frequency of the frequency converter is related to the actually required frequency, and the switch of a power device of the frequency converter is prevented from being damaged.
Step 104: and in the normal control mode, the maximum output frequency of the frequency converter in the normal motor parameter group is set to be less than or equal to the frequency corresponding to the PWM carrier frequency conversion point, and the PWM carrier frequency conversion point comprises a conversion point corresponding to the maximum value of the PWM carrier frequency and a conversion point corresponding to the minimum value of the PWM carrier frequency.
In the normal control mode, it indicates that the output frequency of the frequency converter is less than or equal to the frequency corresponding to the PWM carrier frequency conversion point, that is, the maximum output frequency of the current frequency converter does not need to be set very large. In this example, the maximum output frequency of the inverter in the conventional motor parameter set is set to be less than or equal to the frequency corresponding to the PWM carrier frequency switching point, where the PWM carrier frequency switching point includes the switching point corresponding to the maximum PWM carrier frequency and the switching point corresponding to the minimum PWM carrier frequency, that is, the maximum output frequency of the inverter is set below the PWM carrier frequency switching point, so that the inverter operates at the lowest carrier frequency, and unnecessary switching loss of the power device of the inverter is reduced.
Optionally, in an embodiment of the present application, when determining the operating mode of the frequency converter, for example, step 102 in the modulation method of the frequency converter provided in the embodiment of the present application may be implemented as the following steps: if the set frequency is greater than the preset maximum frequency, setting the working mode of the frequency converter into a high-frequency control mode, and setting the motor parameter group of the frequency converter into a high-frequency motor parameter group; if the set frequency is less than or equal to the preset minimum frequency, setting the working mode of the frequency converter as a conventional control mode, and setting the motor parameter group of the frequency converter as a conventional motor parameter group; and if the set frequency is greater than the preset minimum frequency and less than or equal to the preset maximum frequency, automatically controlling the frequency converter according to a conventional control mode.
In order to facilitate understanding of the relationship between the frequency converter and the PWM modulation frequency, the embodiment of the present application further shows a corresponding relationship between the maximum output frequency of the frequency converter and the PWM modulation frequency, as shown in table 2, table 2 is an operating parameter of another frequency converter provided in the embodiment of the present application.
TABLE 2
In table 2, the PWM modulation frequency Pulse frequency includes: 1.25kHz, 2.0kHz, 2.5kHz, ≧ 4.0kHz, corresponding to the PWM modulation frequencies in Table 1, where the PWM modulation frequencies ≧ 4.0kHz include 4.0kHz, 5.0kHz, 5.5kHz, and 8.0kHz, and the Maximum output frequency of the frequency converter includes 100Hz, 160Hz, 200Hz, and 300Hz, corresponding to the PWM modulation frequencies 1.25kHz, 2.0kHz, 2.5kHz, ≧ 4.0kHz, respectively. Taking the PWM modulation frequency of 2.5kHz as an example, when the PWM modulation frequency is 2.5kHz, the maximum output frequency of the frequency converter is 200Hz, that is, the output frequency of the frequency converter cannot exceed 200 Hz.
The embodiment of the application compares the set frequency corresponding to the output frequency of the frequency converter with the preset maximum frequency, if the set frequency is less than or equal to the preset maximum frequency, the working mode of the frequency converter is a conventional control mode, the motor parameter group of the frequency converter is set to be a conventional motor parameter group, when the frequency converter runs under the conventional motor parameter group, the maximum output frequency of the frequency converter is set to be less than or equal to the frequency corresponding to the PWM carrier frequency conversion point, so that the frequency converter runs at the lowest carrier frequency, and unnecessary switching loss of a power device of the frequency converter is reduced. If the set frequency is greater than the preset maximum frequency, the working mode of the frequency converter is set to be a high-frequency control mode, and the motor parameter group of the frequency converter is set to be a high-frequency motor parameter group, so that the maximum output frequency of the frequency converter is related to the actually required frequency, and the switch of a power device of the frequency converter is prevented from being damaged. The embodiment of the application only controls the motor parameter group of the frequency converter by the preset minimum frequency and the preset maximum frequency, and the preset minimum frequency is set here because if the set frequency is greater than the preset minimum frequency and less than or equal to the preset maximum frequency, the frequency converter is automatically controlled according to a conventional control mode without controlling the motor parameter group of the frequency converter.
Optionally, in an embodiment of the present application, when determining the maximum output frequency of the frequency converter in the set of the high-frequency motor parameters of the frequency converter, for example, step 103 in the modulation method of the frequency converter provided in the embodiment of the present application may be implemented as the following steps: if the maximum rated output frequency of the frequency converter is greater than the maximum frequency in the actual working frequency of the frequency converter, setting the maximum output frequency of the frequency converter as the maximum frequency in the actual working frequency of the frequency converter; and if the maximum rated output frequency of the frequency converter is less than or equal to the maximum frequency in the actual working frequency of the frequency converter, setting the maximum output frequency of the frequency converter as the maximum rated output frequency of the frequency converter.
In the embodiment of the application, when the maximum output frequency of the frequency converter in the high-frequency motor parameter group is determined, the maximum frequency in the maximum rated output frequency of the frequency converter and the maximum frequency in the actual working frequency of the frequency converter is set as the maximum output frequency of the frequency converter. Here, two examples are listed for explanation, in the first example, the maximum rated output frequency of the frequency converter is 160Hz, and the maximum frequency of the frequency converter operating frequency in the actual requirement of the user is 140Hz, so that the requirement of the user can be met by setting the maximum output frequency of the frequency converter at 140Hz, and the resource is saved while the requirement of the user is met. As a second example, the maximum rated output frequency of the frequency converter is 160Hz, and the maximum frequency of the frequency converter operating frequency in actual demand of the user is 150Hz, in which case the maximum output frequency of the frequency converter can only reach 160Hz, so that the maximum output frequency of the frequency converter needs to be set at 160Hz, so that the maximum output frequency of the frequency converter is related to the actually required frequency, and the switch of the power device of the frequency converter is prevented from being damaged.
Optionally, in an embodiment of the present application, when the operating mode of the frequency converter is the high-frequency control mode, the embodiment of the present application further includes the following steps 201 and 202;
step 201: judging whether the set frequency corresponding to the output frequency of the frequency converter is less than or equal to a preset minimum frequency or not; step 202: and if the set frequency is less than or equal to the preset minimum frequency, switching the motor parameter group of the frequency converter from the high-frequency motor parameter group to the conventional motor parameter group.
When the working mode of the frequency converter is the high-frequency control mode, acquiring a set frequency corresponding to the output frequency of the frequency converter in the high-frequency control mode, and judging whether the set frequency is less than or equal to a preset minimum frequency; if the set frequency is less than or equal to the preset minimum frequency, it is indicated that the working mode of the frequency converter should be in the normal control mode, but not in the high-frequency control mode.
Step 202 can also be implemented as steps 2021-2023 below.
Step 2021: when the set frequency is less than or equal to the preset minimum frequency, timing is started to obtain the working time length of the frequency converter under the set frequency; step 2022: judging whether the working time of the frequency converter under the set frequency is less than or equal to the delay time or not, if the working time of the frequency converter under the set frequency is less than or equal to the delay time, the motor parameter group of the frequency converter is consistent with the current motor parameter group; step 2023: and if the working time of the frequency converter under the set frequency is longer than the delay time, switching the motor parameter group of the frequency converter from the high-frequency motor parameter group to the conventional motor parameter group.
In the embodiment of the application, when it is detected that the set frequency corresponding to the output frequency of the frequency converter is less than or equal to the preset minimum frequency, the set of motor parameters of the frequency converter is not immediately switched from the set of high-frequency motor parameters to the set of conventional motor parameters, but the working time of the frequency converter in the set frequency state is timed, if the working time length of the frequency converter in the set frequency is less than or equal to the delay time, the set of motor parameters of the frequency converter is consistent with the current set of motor parameters, and if the working time of the frequency converter in the set frequency is greater than the delay time, the set of motor parameters of the frequency converter is switched from the set of high-frequency motor parameters to the set of conventional motor parameters, so that the set of motor parameters of the frequency converter is prevented from being repeatedly switched when the frequency converter runs near a switching point.
Optionally, in an embodiment of the present application, for example, after the setting the set of motor parameters of the frequency converter as the set of high-frequency motor parameters, the modulation method of the frequency converter further includes: acquiring a first switching frequency of a frequency converter after a motor parameter group is switched to a high-frequency motor parameter group; if the first switching frequency is less than the maximum output frequency of the frequency converter in the high-frequency motor parameter group, the motor parameter group of the frequency converter is kept in the high-frequency motor parameter group.
After setting a motor parameter group of a frequency converter as a high-frequency motor parameter group, acquiring a first switching frequency of the frequency converter after the motor parameter group is switched to the high-frequency motor parameter group, and if the first switching frequency is smaller than the maximum output frequency of the frequency converter in the high-frequency motor parameter group, keeping the motor parameter group of the frequency converter in the high-frequency motor parameter group; if the first switching frequency is greater than or equal to the maximum output frequency of the frequency converter in the high-frequency motor parameter group, which indicates that the switching effect is not achieved after the switching is performed to the high-frequency motor parameter group, the motor parameter group of the frequency converter needs to be controlled according to the modulation method of the frequency converter provided in the steps 101 to 104, the working mode of the frequency converter needs to be detected in real time, and the frequency converter is ensured to work in a normal working state.
Optionally, in an embodiment of the present application, for example, after the setting the set of motor parameters of the frequency converter to the set of regular motor parameters, the modulation method of the frequency converter further includes: acquiring a second switching frequency of the frequency converter after the motor parameter group is switched to the conventional motor parameter group; if the second switching frequency is greater than the maximum output frequency of the frequency converter in the regular motor parameter group, the motor parameter group of the frequency converter is kept in the regular motor parameter group.
After the motor parameter group of the frequency converter is set to be the conventional motor parameter group, the second switching frequency of the frequency converter after the motor parameter group is switched to be the conventional motor parameter group is also acquired; if the second switching frequency is greater than the maximum output frequency of the frequency converter in the regular motor parameter group, the motor parameter group of the frequency converter is kept in the regular motor parameter group. If the second switching frequency is less than or equal to the maximum output frequency of the frequency converter in the conventional motor parameter set, which indicates that the switching effect is not achieved after the switching is performed to the conventional motor parameter set, the motor parameter set of the frequency converter needs to be controlled according to the modulation method of the frequency converter provided in steps 101 to 104, the working mode of the frequency converter needs to be detected in real time, and the frequency converter is ensured to work in a normal working state.
As shown in fig. 3, fig. 3 is a modulation result of the frequency converter according to the embodiment of the present application, in fig. 3, the abscissa is the operating time of the frequency converter and the PWM modulation frequency, the operating time of the frequency converter and the PWM modulation frequency are synchronized, the ordinate is the output frequency VFD output frequency in Hz, and the output frequency PWM modulation frequency in kHz, and since the maximum output frequency of the frequency converter is 120Hz, which is greater than 100Hz, the PWM modulation frequency is 2.5kHz between time points t2-t3, so that the frequency converter operates with a higher PWM carrier frequency, and the switch of the power device of the frequency converter is prevented from being damaged. The maximum output frequency of the frequency converter between the time points t1-t2 and the time points t3-t4 is less than or equal to 100Hz, and the PWM modulation frequency is 1.25Hz, so that the frequency converter runs at the lowest carrier frequency, and unnecessary switching loss of a power device of the frequency converter is reduced.
Based on the modulation method of the frequency converter provided in any of the embodiments, an embodiment of the present application provides a modulation apparatus of the frequency converter, as shown in fig. 4, fig. 4 is a schematic diagram of the modulation apparatus of the frequency converter provided in the embodiment of the present application, and the modulation apparatus 40 of the frequency converter includes an obtaining module 401, a working mode determining module 402, a high-frequency control module 403, and a normal control module 404;
an obtaining module 401, configured to obtain a set frequency corresponding to an output frequency of a frequency converter;
a working mode determining module 402, configured to determine a working mode of the frequency converter according to a relationship between a set frequency and a preset maximum frequency and a preset minimum frequency, where the working mode includes a high-frequency control mode and a conventional control mode;
a high-frequency control module 403, configured to determine, in the high-frequency control mode, a maximum output frequency of the frequency converter in the high-frequency motor parameter set according to a relationship between a maximum frequency in actual operating frequencies of the frequency converter and a maximum rated output frequency of the frequency converter;
and the normal control module 404 is configured to set, in the normal control mode, the maximum output frequency of the frequency converter in the normal motor parameter set to be less than or equal to a frequency corresponding to the PWM carrier frequency switching point, where the PWM carrier frequency switching point includes a switching point corresponding to a maximum PWM carrier frequency and a switching point corresponding to a minimum PWM carrier frequency.
Optionally, in an embodiment of the present application, the operation mode determining module 402 is further configured to set the operation mode of the frequency converter to the high-frequency control mode and set the motor parameter group of the frequency converter to the high-frequency motor parameter group if the set frequency is greater than the preset maximum frequency; if the set frequency is less than or equal to the preset minimum frequency, setting the working mode of the frequency converter as a conventional control mode, and setting the motor parameter group of the frequency converter as a conventional motor parameter group; and if the set frequency is greater than the preset minimum frequency and less than or equal to the preset maximum frequency, automatically controlling the frequency converter according to a conventional control mode.
Optionally, in an embodiment of the present application, the high-frequency control module 403 is further configured to set the maximum output frequency of the frequency converter to the maximum frequency of the actual operating frequencies of the frequency converter if the maximum rated output frequency of the frequency converter is greater than the maximum frequency of the actual operating frequencies of the frequency converter; and if the maximum rated output frequency of the frequency converter is less than or equal to the maximum frequency in the actual working frequency of the frequency converter, setting the maximum output frequency of the frequency converter as the maximum rated output frequency of the frequency converter.
Optionally, in an embodiment of the present application, the modulation device 40 of the frequency converter further includes a switching module, where the switching module is configured to determine whether a set frequency corresponding to an output frequency of the frequency converter is less than or equal to a preset minimum frequency when an operating mode of the frequency converter is a high-frequency control mode; and if the set frequency is less than or equal to the preset minimum frequency, switching the motor parameter group of the frequency converter from the high-frequency motor parameter group to the conventional motor parameter group.
Optionally, in an embodiment of the present application, the modulation device 40 of the frequency converter further includes a delay module, where the delay module is further configured to start timing when the set frequency is less than or equal to a preset minimum frequency, so as to obtain a working time length of the frequency converter at the set frequency; judging whether the working time of the frequency converter under the set frequency is less than or equal to the delay time, if the working time of the frequency converter under the set frequency is less than or equal to the delay time, the motor parameter group of the frequency converter is consistent with the current motor parameter group; and if the working time of the frequency converter under the set frequency is longer than the delay time, switching the motor parameter group of the frequency converter from the high-frequency motor parameter group to the conventional motor parameter group.
Optionally, in an embodiment of the present application, the high frequency control module 403 is further configured to obtain a first switching frequency of the frequency converter after the motor parameter set is switched to the high frequency motor parameter set; if the first switching frequency is less than the maximum output frequency of the frequency converter in the high-frequency motor parameter group, the motor parameter group of the frequency converter is kept in the high-frequency motor parameter group.
Optionally, in an embodiment of the present application, the conventional control module 404 is further configured to obtain a second switching frequency of the frequency converter after the motor parameter set is switched to the conventional motor parameter set; if the second switching frequency is greater than the maximum output frequency of the frequency converter in the regular motor parameter group, the motor parameter group of the frequency converter is kept in the regular motor parameter group.
The modulation device of the frequency converter in the embodiment of the application is used for implementing the corresponding modulation method of the frequency converter in the foregoing multiple method embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described herein again. In addition, the functional implementation of each module in the modulation apparatus of the frequency converter in the embodiment of the present application can refer to the description of the corresponding part in the foregoing method embodiment, and is not repeated herein.
Based on the modulation method of the frequency converter provided in any of the embodiments, an embodiment of the present application provides a frequency converter, as shown in fig. 5, fig. 5 is a schematic diagram of the frequency converter provided in the embodiment of the present application, where the frequency converter 50 includes a comparing unit 502, an RS flip-flop 504, and a switching unit 506;
the comparing unit 502 includes a first comparator 5021 and a second comparator 5022, the first comparator 5021 is used for comparing a set frequency corresponding to the output frequency of the frequency converter with a preset maximum frequency, the output end of the first comparator 5021 is electrically connected with the set end of the RS flip-flop 504, and the set end receives the comparison result of the first comparator 5021; the second comparator 5022 is used for comparing the set frequency corresponding to the output frequency of the frequency converter with a preset minimum frequency, the output end of the second comparator 5022 is electrically connected with the reset end of the RS flip-flop 504, and the reset end receives the comparison result of the second comparator 5022; the output end of the RS flip-flop 504 is electrically connected to the input end of the switching unit 506, and the switching unit 506 switches the set of motor parameters of the frequency converter according to the output result of the RS flip-flop 504.
The comparison unit obtains a set frequency f corresponding to the output frequency of the frequency convertersetpointThe first comparator is used for setting the frequency f corresponding to the output frequency of the frequency convertersetpointWith a predetermined maximum frequency fhighAre compared with each other to judge fsetpointWhether or not it is greater than fhighI.e. fsetpoint＞fhighAnd the comparison result is output to a Set end Set of the RS trigger, and the second comparator is used for setting a Set frequency f corresponding to the output frequency of the frequency convertersetpointWith a predetermined minimum frequency flowAre compared with each other to judge fsetpointWhether or not f is less than or equal tolowI.e. fsetpoint≤flowAnd the comparison result is output to a Reset end Reset of the RS trigger, and an output end Q of the RS trigger is electrically connected with an input end of the switching unitThe output Q of the RS flip-flop inputs a motor parameter set I of the frequency converter to the switching unit, and the switching unit is configured to switch the motor parameter set MDS to I1 or I0 according to a result of the motor parameter set I, where I1 indicates that the motor parameter set is a high-frequency motor parameter set, and I0 indicates that the motor parameter set is a conventional motor parameter set.
Optionally, in an embodiment of the present application, based on fig. 5, the frequency converter 50 further includes a delay 503, as shown in fig. 6, fig. 6 is a schematic diagram of another frequency converter provided in an embodiment of the present application, an input end of the delay 503 is electrically connected to an output end of the second comparator 5022, an output end of the delay 503 is electrically connected to a reset end of the RS flip-flop 504, and the delay 503 is configured to perform delay processing on a comparison result of the second comparator 5022.
The second comparator is used for setting the frequency f corresponding to the output frequency of the frequency convertersetpointAnd a predetermined minimum frequency flowAre compared with each other to judge fsetpointWhether or not f is less than or equal tolowI.e. fsetpoint≤flowAnd when the output result of the second comparator is yes, the delayer is used for timing, optionally, the delayer may be a rising edge delay on delay, and when the delay time set by the delayer is met, the comparison result is sent to the reset terminal of the RS flip-flop.
Optionally, in an embodiment of the present application, on the basis of fig. 5 or fig. 6, the frequency converter 50 further includes an enabling unit 508, as shown in fig. 7, fig. 7 is a schematic diagram of another frequency converter provided in an embodiment of the present application, fig. 7 is an exemplary illustration on the basis of fig. 6, and it is understood that fig. 7 may also include an enabling unit on the basis of the frequency converter of fig. 5, which is not limited to this embodiment of the present application. The enable unit 508 includes a first enable unit 5081 and a second enable unit 5082; the first switching output end of the switching unit 506 is electrically connected with a first enabling unit 5081, and the first enabling unit 5081 is used for triggering a conventional motor parameter group of the frequency converter; a second switching output of the switching unit 506 is electrically connected to a second enabling unit 5082, and the second enabling unit 5082 is configured to trigger a high frequency motor parameter set of the frequency converter.
The first enabling unit MDS0 is used for triggering the normal motor parameter set, i.e. I ═ 0, of the frequency converter and acquiring a second switching frequency of the frequency converter after the motor parameter set is switched to the normal motor parameter set; if the second switching frequency fturnIs greater than the maximum output frequency f0 of the frequency converter in the conventional motor parameter groupmaxI.e. fturn＞f0maxAnd the PWM modulation frequency is low, the motor parameter set of the frequency converter is kept in the conventional motor parameter set. The first enabling unit MDS1 is used to trigger the high-frequency motor parameter set of the frequency converter, i.e. I is 1, and to obtain a first switching frequency of the frequency converter after the motor parameter set is switched to the high-frequency motor parameter set; if the first switching frequency fturnLess than the maximum output frequency f1 of the frequency converter in the high-frequency motor parameter groupmaxI.e. fturn＜f1maxIf the PWM frequency is high, the motor parameter set of the frequency converter is maintained at the high frequency motor parameter set.
Based on the modulation method of the frequency converter described in any of the above embodiments, the present application provides a computer storage medium storing a computer program, and the computer program, when executed by a processor, implements the method described in any of the above embodiments.
It should be noted that, according to implementation needs, each component/step described in the embodiment of the present application may be divided into more components/steps, and two or more components/steps or partial operations of the components/steps may also be combined into a new component/step to achieve the purpose of the embodiment of the present application.
The above-described methods according to the embodiments of the present application may be implemented in hardware, firmware, or as software or computer code that may be stored in a recording medium such as a CD ROM, RAM, floppy disk, hard disk, or magneto-optical disk, or as computer code downloaded through a network, originally stored in a remote recording medium or a non-transitory machine-readable medium, and to be stored in a local recording medium, so that the methods described herein may be stored in such software processes on a recording medium using a general purpose computer, a dedicated processor, or programmable or dedicated hardware such as an ASIC or FPGA. It will be appreciated that the computer, processor, microprocessor controller or programmable hardware includes memory components (e.g., RAM, ROM, flash memory, etc.) that can store or receive software or computer code that, when accessed and executed by the computer, processor or hardware, implements the modulation method of the frequency converter described herein. Further, when a general-purpose computer accesses code for implementing the modulation method of the frequency converter shown herein, execution of the code converts the general-purpose computer into a special-purpose computer for executing the modulation method of the frequency converter shown herein.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Those of ordinary skill in the art will appreciate that the various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above embodiments are only used for illustrating the embodiments of the present application, and not for limiting the embodiments of the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application, so that all equivalent technical solutions also belong to the scope of the embodiments of the present application, and the scope of the patent protection of the embodiments of the present application should be defined by the claims.
Claims (12)
1. A modulation method of a frequency converter, wherein the method comprises:
acquiring a set frequency (101) corresponding to the output frequency of the frequency converter;
determining the working mode of the frequency converter according to the relation between the set frequency and a preset maximum frequency and a preset minimum frequency, wherein the working mode comprises a high-frequency control mode and a conventional control mode (102);
if the set frequency is greater than the preset maximum frequency, setting the working mode of the frequency converter to be the high-frequency control mode; if the set frequency is less than or equal to the preset minimum frequency, setting the working mode of the frequency converter to be the conventional control mode;
in the high-frequency control mode, determining the maximum output frequency (103) of the frequency converter in the high-frequency motor parameter group according to the relation between the maximum frequency in the actual working frequency of the frequency converter and the maximum rated output frequency of the frequency converter;
and in the normal control mode, setting the maximum output frequency of the frequency converter in the normal motor parameter group to be less than or equal to the frequency corresponding to the PWM carrier frequency conversion point, wherein the PWM carrier frequency conversion point comprises a conversion point corresponding to the maximum value of the PWM carrier frequency and a conversion point corresponding to the minimum value of the PWM carrier frequency (104).
2. The method of claim 1, wherein determining the operation mode of the frequency converter according to the relationship between the set frequency and a preset maximum frequency and a preset minimum frequency comprises:
in the high-frequency control mode, setting a motor parameter group of the frequency converter as the high-frequency motor parameter group;
in the normal control mode, setting a motor parameter group of the frequency converter as the normal motor parameter group;
and if the set frequency is greater than the preset minimum frequency and less than or equal to the preset maximum frequency, automatically controlling the frequency converter according to the conventional control mode.
3. The method of claim 1, wherein determining the maximum output frequency of the inverter in the set of high frequency motor parameters based on a relationship between the maximum frequency of the actual operating frequencies of the inverter and the maximum rated output frequency of the inverter comprises:
if the maximum rated output frequency of the frequency converter is greater than the maximum frequency in the actual working frequencies of the frequency converter, setting the maximum output frequency of the frequency converter as the maximum frequency in the actual working frequencies of the frequency converter;
and if the maximum rated output frequency of the frequency converter is less than or equal to the maximum frequency in the actual working frequency of the frequency converter, setting the maximum output frequency of the frequency converter as the maximum rated output frequency of the frequency converter.
4. The method of claim 1, wherein the method further comprises:
when the working mode of the frequency converter is the high-frequency control mode, judging whether the set frequency corresponding to the output frequency of the frequency converter is less than or equal to a preset minimum frequency;
and if the set frequency is less than or equal to the preset minimum frequency, switching the motor parameter group of the frequency converter from the high-frequency motor parameter group to the conventional motor parameter group.
5. The method of claim 4, wherein switching the set of motor parameters of the frequency converter from the set of high frequency motor parameters to the set of regular motor parameters if the set frequency is less than or equal to the preset minimum frequency comprises:
when the set frequency is less than or equal to the preset minimum frequency, timing is started to obtain the working time length of the frequency converter under the set frequency;
judging whether the working time of the frequency converter under the set frequency is less than or equal to the delay time or not, if the working time of the frequency converter under the set frequency is less than or equal to the delay time, the motor parameter group of the frequency converter is consistent with the current motor parameter group;
and if the working time of the frequency converter under the set frequency is longer than the delay time, switching the motor parameter group of the frequency converter from the high-frequency motor parameter group to the conventional motor parameter group.
6. The method of claim 2, wherein after setting the set of motor parameters of the frequency converter to the set of high frequency motor parameters, the method further comprises:
acquiring a first switching frequency of the frequency converter after the motor parameter group is switched into the high-frequency motor parameter group;
and if the first switching frequency is less than the maximum output frequency of the frequency converter in the high-frequency motor parameter group, keeping the motor parameter group of the frequency converter in the high-frequency motor parameter group.
7. The method of claim 2, wherein after setting the set of motor parameters of the frequency converter to the set of regular motor parameters, the method further comprises:
acquiring a second switching frequency of the frequency converter after the motor parameter group is switched to the conventional motor parameter group;
and if the second switching frequency is greater than the maximum output frequency of the frequency converter in the regular motor parameter group, keeping the motor parameter group of the frequency converter in the regular motor parameter group.
8. A modulation apparatus of a frequency converter, comprising:
the acquisition module (401) is used for acquiring a set frequency corresponding to the output frequency of the frequency converter;
a working mode determining module (402) for determining a working mode of the frequency converter according to a relationship between the set frequency and a preset maximum frequency and a preset minimum frequency, wherein the working mode comprises a high-frequency control mode and a conventional control mode; if the set frequency is greater than the preset maximum frequency, setting the working mode of the frequency converter to be the high-frequency control mode; if the set frequency is less than or equal to the preset minimum frequency, setting the working mode of the frequency converter to be the conventional control mode;
a high-frequency control module (403) for determining the maximum output frequency of the frequency converter in the high-frequency motor parameter group according to the relationship between the maximum frequency in the actual working frequency of the frequency converter and the maximum rated output frequency of the frequency converter in the high-frequency control mode;
and the normal control module (404) is used for setting the maximum output frequency of the frequency converter in the normal motor parameter group to be less than or equal to the frequency corresponding to the PWM carrier frequency conversion point when in the normal control mode, wherein the PWM carrier frequency conversion point comprises a conversion point corresponding to the maximum value of the PWM carrier frequency and a conversion point corresponding to the minimum value of the PWM carrier frequency.
9. A frequency converter comprises a comparison unit (502), an RS trigger (504) and a switching unit (506);
the comparison unit (502) comprises a first comparator (5021) and a second comparator (5022), the first comparator (5021) is used for comparing a set frequency corresponding to the output frequency of the frequency converter with a preset maximum frequency, the output end of the first comparator (5021) is electrically connected with the set end of the RS trigger (504), and the set end receives the comparison result of the first comparator (5021);
the second comparator (5022) is used for comparing a set frequency corresponding to the output frequency of the frequency converter with a preset minimum frequency, the output end of the second comparator (5022) is electrically connected with the reset end of the RS trigger (504), and the reset end receives the comparison result of the second comparator (5022);
the output end of the RS trigger (504) is electrically connected with the input end of the switching unit (506), and the switching unit (506) switches the motor parameter group of the frequency converter according to the output result of the RS trigger (504), wherein the motor parameter group comprises a conventional motor parameter group and a high-frequency motor parameter group.
10. The frequency converter of claim 9, further comprising a delay (503);
the input end of the delayer (503) is electrically connected with the output end of the second comparator (5022), the output end of the delayer (503) is electrically connected with the reset end of the RS trigger (504), and the delayer (503) is used for delaying the comparison result of the second comparator (5022).
11. The frequency converter according to claim 9, further comprising an enabling unit (508), the enabling unit (508) comprising a first enabling unit (5081) and a second enabling unit (5082);
a first switching output of the switching unit (506) is electrically connected to the first enabling unit (5081), the first enabling unit (5081) is configured to trigger the conventional motor parameter set of the frequency converter;
a second switching output of the switching unit (506) is electrically connected to a second enabling unit (5082), and the second enabling unit (5082) is configured to trigger the set of high frequency motor parameters of the frequency converter.
12. A computer storage medium, on which a computer program is stored which, when being executed by a processor, carries out the modulation method of a frequency converter according to any one of claims 1-7.
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| CN111884564A (en) * | 2020-08-06 | 2020-11-03 | 深圳市海浦蒙特科技有限公司 | Frequency converter control method, frequency converter system and storage medium |
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| CN111884564A (en) * | 2020-08-06 | 2020-11-03 | 深圳市海浦蒙特科技有限公司 | Frequency converter control method, frequency converter system and storage medium |
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