CN116707291A - Instantaneous start-stop control method and system for high-voltage frequency conversion - Google Patents
Instantaneous start-stop control method and system for high-voltage frequency conversion Download PDFInfo
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- CN116707291A CN116707291A CN202310479424.XA CN202310479424A CN116707291A CN 116707291 A CN116707291 A CN 116707291A CN 202310479424 A CN202310479424 A CN 202310479424A CN 116707291 A CN116707291 A CN 116707291A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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Abstract
The application relates to the technical field of high-voltage frequency conversion, and discloses a method and a system for instantaneous start-stop control of high-voltage frequency conversion.
Description
Technical Field
The application relates to the technical field of high-voltage frequency conversion, in particular to an instantaneous stopping and starting control method and system for high-voltage frequency conversion.
Background
The high-voltage frequency converter is an alternating current device which converts alternating current with fixed voltage and fixed frequency into adjustable voltage and adjustable frequency, is widely applied to energy saving and automatic systems, improves the technical level, improves the product quality and the like, has various protection functions such as overcurrent protection, overload protection, overheat protection, overvoltage protection, undervoltage protection and the like, and in practical application, when the power supply has instantaneous power failure and resumes power supply, the power failure time is very short, and the situation that the high-voltage frequency converter has instantaneous power failure and restarts is usually within 2 seconds.
The current high-voltage frequency converter is provided with a frequency conversion protection device, when an instantaneous power failure occurs and power supply is restored, the main principle is that when the direct current voltage of a main circuit is reduced to an undervoltage value, the output of the high-voltage frequency converter is stopped, a protection function acts, when the power supply is powered back, the protection function still acts, the high-voltage frequency converter is not started again, but the normal working state of the high-voltage frequency converter can be influenced by the mode, and the normal starting of the high-voltage frequency converter cannot be guaranteed.
Therefore, how to provide an instantaneous start-stop control method capable of effectively controlling a high-voltage frequency converter is a technical problem to be solved at present.
Disclosure of Invention
The embodiment of the application provides a method and a system for controlling instantaneous start and stop of high-voltage frequency conversion, which are used for solving the technical problems that the start and stop of a high-voltage frequency converter cannot be effectively controlled and the safe start of the high-voltage frequency converter cannot be ensured in the prior art.
In order to achieve the above object, the present application provides a method for controlling instantaneous start-stop of high-voltage frequency conversion, the method comprising:
detecting a real-time voltage value of a power grid, judging whether the real-time voltage value is smaller than a rated voltage value, and if yes, generating an instantaneous power failure signal of the power grid;
when the power grid instantaneous power failure signal is generated, acquiring a rotor rotating speed A of a high-voltage motor and a synchronous rotating speed E of the high-voltage motor, and adjusting the synchronous rotating speed E of the high-voltage motor according to the rotor rotating speed A of the high-voltage motor;
collecting a bus current active component F of a high-voltage frequency converter, and setting the frequency reduction speed of the high-voltage frequency converter according to the bus current active component F;
after the frequency reduction speed of the high-voltage frequency converter is set according to the bus current active component F, a regulator is set according to the high-voltage frequency converter, and the working state of the high-voltage frequency converter is regulated based on the regulator.
In one embodiment, when adjusting the synchronous speed E of the high voltage motor according to the rotor speed a of the high voltage motor, it includes:
presetting a rotor speed matrix B of a high-voltage motor, and setting B (B1, B2, B3 and B4), wherein B1 is a first preset rotor speed, B2 is a second preset rotor speed, B3 is a third preset rotor speed, B4 is a fourth preset rotor speed, and B1 is more than B2 and less than B3 and less than B4;
presetting a synchronous rotating speed correction coefficient matrix h of a high-voltage motor, and setting h (h 1, h2, h3, h4 and h 5), wherein h1 is a first preset synchronous rotating speed correction coefficient, h2 is a second preset synchronous rotating speed correction coefficient, h3 is a third preset synchronous rotating speed correction coefficient, h4 is a fourth preset synchronous rotating speed correction coefficient, h5 is a fifth preset synchronous rotating speed correction coefficient, and h1 is more than 0.8 and less than h2 and less than h3 and h4 and less than h5 and less than 1;
correcting the synchronous rotating speed E of the high-voltage motor according to the relation between the rotating speed A of the rotor of the high-voltage motor and each preset rotating speed of the rotor:
when A is smaller than B1, the first preset synchronous speed correction coefficient h1 is selected to correct the synchronous speed E of the high-voltage motor, and the corrected synchronous speed of the high-voltage motor is E.multidot.h1;
when B1 is less than or equal to A and less than B2, selecting the second preset synchronous rotating speed correction coefficient h2 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.h2;
when B2 is less than or equal to A and less than B3, selecting the third preset synchronous rotating speed correction coefficient h3 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.multidot.h3;
when B3 is less than or equal to A and less than B4, the fourth preset synchronous speed correction coefficient h4 is selected to correct the synchronous speed E of the high-voltage motor, and the corrected synchronous speed of the high-voltage motor is E.h4;
and when B4 is less than or equal to A, selecting the fifth preset synchronous rotating speed correction coefficient h5 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.times.h5.
In one embodiment, when setting the down-conversion speed of the high-voltage frequency converter according to the bus current active component F, the method includes:
presetting a bus current active component matrix G of a high-voltage frequency converter, and setting G (G1, G2, G3 and G4), wherein G1 is a first preset bus current active component, G2 is a second preset bus current active component, G3 is a third preset bus current active component, G4 is a fourth preset bus current active component, and G1 is more than G2 and less than G3 and less than G4;
presetting a frequency-reducing speed matrix D of a high-voltage frequency converter, and setting D (D1, D2, D3, D4 and D5), wherein D1 is a first preset frequency-reducing speed, D2 is a second preset frequency-reducing speed, D3 is a third preset frequency-reducing speed, D4 is a fourth preset frequency-reducing speed, D5 is a fifth preset frequency-reducing speed, and D1 is more than D2 and less than D3 and less than D4 and less than D5;
setting the frequency reduction speed of the high-voltage frequency converter according to the relation between the bus current active component F of the high-voltage frequency converter and each preset bus current active component:
when F is smaller than G1, selecting the first preset frequency-reducing speed D1 as the frequency-reducing speed of the high-voltage frequency converter;
when G1 is less than or equal to F and less than G2, selecting the second preset frequency-reducing speed D2 as the frequency-reducing speed of the high-voltage frequency converter;
when G2 is less than or equal to F and less than G3, selecting the third preset frequency-reducing speed D3 as the frequency-reducing speed of the high-voltage frequency converter;
when G3 is less than or equal to F and less than G4, selecting the fourth preset frequency-reducing speed D4 as the frequency-reducing speed of the high-voltage frequency converter;
and when G4 is less than or equal to F, selecting the fifth preset frequency reduction speed D5 as the frequency reduction speed of the high-voltage frequency converter.
In one embodiment, when the regulator is set according to the high-voltage frequency converter and the high-voltage frequency converter is regulated based on the regulator, the method includes:
after setting the down-conversion speed of the high-voltage frequency converter according to the bus current active component F, the down-conversion speed of the high-voltage frequency converter is Di, i=1, 2,3,4,5;
detecting a voltage reference value of the high-voltage frequency converter;
collecting a frequency-reducing time node corresponding to the frequency-reducing speed Di of the high-voltage frequency converter, taking the frequency-reducing time node as an output initial value of the regulator, and establishing the regulator;
and adjusting the voltage reference value of the high-voltage frequency converter according to the regulator.
In one embodiment, the method further comprises:
detecting a second voltage value of the power grid within preset time, and generating a power grid instantaneous start signal when the second voltage value is greater than or equal to the rated voltage value;
and receiving the power grid instantaneous starting signal, closing the regulator, and regulating the operating power of the high-voltage frequency converter based on the frequency-raising speed of the high-voltage frequency converter.
In order to achieve the above object, the present application provides a high-voltage variable-frequency instantaneous start-stop control system, which comprises:
the judging module is used for detecting the real-time voltage value of the power grid and judging whether the real-time voltage value is smaller than the rated voltage value, if yes, generating an instantaneous power failure signal of the power grid;
the adjusting module is used for acquiring the rotor rotating speed A of the high-voltage motor and the synchronous rotating speed E of the high-voltage motor when the power grid instantaneous power failure signal is generated, and adjusting the synchronous rotating speed E of the high-voltage motor according to the rotor rotating speed A of the high-voltage motor;
the setting module is used for collecting a bus current active component F of the high-voltage frequency converter and setting the frequency reduction speed of the high-voltage frequency converter according to the bus current active component F;
and the control module is used for setting the frequency reduction speed of the high-voltage frequency converter according to the bus current active component F, setting a regulator according to the high-voltage frequency converter and controlling the working state of the high-voltage frequency converter based on the regulator.
In one embodiment, the adjusting module is specifically configured to:
the adjusting module is used for presetting a rotor speed matrix B of the high-voltage motor, and setting B (B1, B2, B3 and B4), wherein B1 is a first preset rotor speed, B2 is a second preset rotor speed, B3 is a third preset rotor speed, B4 is a fourth preset rotor speed, and B1 is more than B2 and less than B3 and less than B4;
the adjusting module is used for presetting a synchronous rotating speed correction coefficient matrix h of the high-voltage motor, setting h (h 1, h2, h3, h4 and h 5), wherein h1 is a first preset synchronous rotating speed correction coefficient, h2 is a second preset synchronous rotating speed correction coefficient, h3 is a third preset synchronous rotating speed correction coefficient, h4 is a fourth preset synchronous rotating speed correction coefficient, h5 is a fifth preset synchronous rotating speed correction coefficient, and h1 is more than 0.8 and less than h2, h3 and less than h4 and less than h5 and less than 1;
the adjusting module is used for correcting the synchronous rotating speed E of the high-voltage motor according to the relation between the rotating speed A of the rotor of the high-voltage motor and each preset rotating speed of the rotor:
when A is smaller than B1, the first preset synchronous speed correction coefficient h1 is selected to correct the synchronous speed E of the high-voltage motor, and the corrected synchronous speed of the high-voltage motor is E.multidot.h1;
when B1 is less than or equal to A and less than B2, selecting the second preset synchronous rotating speed correction coefficient h2 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.h2;
when B2 is less than or equal to A and less than B3, selecting the third preset synchronous rotating speed correction coefficient h3 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.multidot.h3;
when B3 is less than or equal to A and less than B4, the fourth preset synchronous speed correction coefficient h4 is selected to correct the synchronous speed E of the high-voltage motor, and the corrected synchronous speed of the high-voltage motor is E.h4;
and when B4 is less than or equal to A, selecting the fifth preset synchronous rotating speed correction coefficient h5 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.times.h5.
In one embodiment, the setting module is specifically configured to:
the setting module is used for presetting a bus current active component matrix G of the high-voltage frequency converter and setting G (G1, G2, G3 and G4), wherein G1 is a first preset bus current active component, G2 is a second preset bus current active component, G3 is a third preset bus current active component, G4 is a fourth preset bus current active component, and G1 is more than G2 and less than G3 and less than G4;
the setting module is used for presetting a frequency-reducing speed matrix D of the high-voltage frequency converter and setting D (D1, D2, D3, D4 and D5), wherein D1 is a first preset frequency-reducing speed, D2 is a second preset frequency-reducing speed, D3 is a third preset frequency-reducing speed, D4 is a fourth preset frequency-reducing speed, D5 is a fifth preset frequency-reducing speed, D1 is more than D2 and less than D3 and less than D4 and less than D5;
the setting module is used for setting the frequency reduction speed of the high-voltage frequency converter according to the relation between the bus current active component F of the high-voltage frequency converter and each preset bus current active component:
when F is smaller than G1, selecting the first preset frequency-reducing speed D1 as the frequency-reducing speed of the high-voltage frequency converter;
when G1 is less than or equal to F and less than G2, selecting the second preset frequency-reducing speed D2 as the frequency-reducing speed of the high-voltage frequency converter;
when G2 is less than or equal to F and less than G3, selecting the third preset frequency-reducing speed D3 as the frequency-reducing speed of the high-voltage frequency converter;
when G3 is less than or equal to F and less than G4, selecting the fourth preset frequency-reducing speed D4 as the frequency-reducing speed of the high-voltage frequency converter;
and when G4 is less than or equal to F, selecting the fifth preset frequency reduction speed D5 as the frequency reduction speed of the high-voltage frequency converter.
In one embodiment, the control module is specifically configured to:
the control module is used for setting the frequency-reducing speed of the high-voltage frequency converter according to the bus current active component F, wherein the frequency-reducing speed of the high-voltage frequency converter is Di, i=1, 2,3,4 and 5;
the control module is used for detecting a voltage reference value of the high-voltage frequency converter;
the control module is used for collecting a frequency-reducing time node corresponding to the frequency-reducing speed Di of the high-voltage frequency converter, taking the frequency-reducing time node as an output initial value of the regulator, and establishing the regulator;
the control module is used for adjusting the voltage reference value of the high-voltage frequency converter according to the adjuster.
In one embodiment, the method further comprises:
the second adjusting module is used for detecting a second voltage value of the power grid in preset time and generating a power grid instantaneous starting signal when the second voltage value is greater than or equal to the rated voltage value;
the second adjusting module is also used for receiving the power grid instantaneous starting signal, closing the regulator and adjusting the operating power of the high-voltage frequency converter based on the frequency-raising speed of the high-voltage frequency converter.
The application provides a method and a system for controlling instantaneous stop and start of high-voltage frequency conversion, which have the following beneficial effects compared with the prior art:
the application discloses a method and a system for controlling instantaneous stopping of high-voltage frequency conversion, which are used for detecting a real-time voltage value of a power grid, judging whether the real-time voltage value is smaller than a rated voltage value, if so, generating a power grid instantaneous power failure signal, acquiring a rotor rotating speed A of a high-voltage motor and a synchronous rotating speed E of the high-voltage motor, regulating the synchronous rotating speed E of the high-voltage motor according to the rotor rotating speed A of the high-voltage motor, acquiring a bus current active component F of a high-voltage frequency converter, setting a frequency-reducing speed of the high-voltage frequency converter according to the bus current active component F, setting a regulator according to the high-voltage frequency converter after setting the frequency-reducing speed of the high-voltage frequency converter according to the bus current active component F, and controlling the working state of the high-voltage frequency converter based on the regulator.
Drawings
FIG. 1 shows a schematic flow chart of a method for controlling instantaneous shutdown of high-voltage frequency conversion in an embodiment of the application;
fig. 2 shows a schematic structural diagram of a high-voltage variable-frequency instantaneous start-stop control system according to an embodiment of the application.
Detailed Description
The following describes in further detail the embodiments of the present application with reference to the drawings and examples. The following examples are illustrative of the application and are not intended to limit the scope of the application.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The following is a description of preferred embodiments of the application, taken in conjunction with the accompanying drawings.
As shown in fig. 1, an embodiment of the present application discloses a method for controlling instantaneous start-stop of high-voltage frequency conversion, which includes:
s110: and detecting a real-time voltage value of the power grid, judging whether the real-time voltage value is smaller than a rated voltage value, and if so, generating an instantaneous power failure signal of the power grid.
In this embodiment, the rated voltage value may be set according to actual situations, and when the real-time voltage value is smaller than the rated voltage value, the power grid is powered off at this time, so as to generate a power grid instantaneous power-off signal.
S120: when the power grid instantaneous power failure signal is generated, the rotor rotating speed A of the high-voltage motor and the synchronous rotating speed E of the high-voltage motor are obtained, and the synchronous rotating speed E of the high-voltage motor is adjusted according to the rotor rotating speed A of the high-voltage motor.
In some embodiments of the application, when adjusting the synchronous speed E of the high voltage motor according to the rotor speed a of the high voltage motor, it comprises:
presetting a rotor speed matrix B of a high-voltage motor, and setting B (B1, B2, B3 and B4), wherein B1 is a first preset rotor speed, B2 is a second preset rotor speed, B3 is a third preset rotor speed, B4 is a fourth preset rotor speed, and B1 is more than B2 and less than B3 and less than B4;
presetting a synchronous rotating speed correction coefficient matrix h of a high-voltage motor, and setting h (h 1, h2, h3, h4 and h 5), wherein h1 is a first preset synchronous rotating speed correction coefficient, h2 is a second preset synchronous rotating speed correction coefficient, h3 is a third preset synchronous rotating speed correction coefficient, h4 is a fourth preset synchronous rotating speed correction coefficient, h5 is a fifth preset synchronous rotating speed correction coefficient, and h1 is more than 0.8 and less than h2 and less than h3 and h4 and less than h5 and less than 1;
correcting the synchronous rotating speed E of the high-voltage motor according to the relation between the rotating speed A of the rotor of the high-voltage motor and each preset rotating speed of the rotor:
when A is smaller than B1, the first preset synchronous speed correction coefficient h1 is selected to correct the synchronous speed E of the high-voltage motor, and the corrected synchronous speed of the high-voltage motor is E.multidot.h1;
when B1 is less than or equal to A and less than B2, selecting the second preset synchronous rotating speed correction coefficient h2 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.h2;
when B2 is less than or equal to A and less than B3, selecting the third preset synchronous rotating speed correction coefficient h3 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.multidot.h3;
when B3 is less than or equal to A and less than B4, the fourth preset synchronous speed correction coefficient h4 is selected to correct the synchronous speed E of the high-voltage motor, and the corrected synchronous speed of the high-voltage motor is E.h4;
and when B4 is less than or equal to A, selecting the fifth preset synchronous rotating speed correction coefficient h5 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.times.h5.
It should be understood that there are the following differences between the synchronous speed of the high voltage motor and the rotor speed of the high voltage motor:
the objects are different. The synchronous rotational speed is for the stator; the rotor speed is for the rotor.
The second effect is different. The speed of the rotating magnetic field generated on the stator, i.e. the synchronous rotational speed, acts to convert electrical energy into a magnetic field and thus into kinetic energy of the rotor. The rotor converts the received kinetic energy into mechanical energy by a mechanical principle and applies the mechanical energy to daily life.
And (III) different speeds. In theory, in a high voltage motor, the rotor speed is not greater than the synchronous speed. However, in practical application, due to the construction principle and mechanical characteristics of the high-voltage motor, the rotor speed is lower than the synchronous speed, and the rotation speed becomes smaller as the load increases.
In this embodiment, when the power grid instantaneous power failure signal is generated, the high-voltage motor is not stopped, but the synchronous rotation speed E of the high-voltage motor is corrected according to the relationship between the rotor rotation speed a of the high-voltage motor and each preset rotor rotation speed, the synchronous rotation speed of the high-voltage motor is reduced, the synchronous rotation speed of the high-voltage motor is lower than the rotor rotation speed of the high-voltage motor, the negative slip between the synchronous rotation speed of the high-voltage motor and the rotor rotation speed of the high-voltage motor is stable, and the motor is in a micro-electric state, and at the moment, the motor cannot absorb the power of the power grid.
S130: and collecting a bus current active component F of the high-voltage frequency converter, and setting the frequency reduction speed of the high-voltage frequency converter according to the bus current active component F.
In some embodiments of the application, when setting the down-conversion speed of the high-voltage frequency converter according to the bus current active component F, the method comprises:
presetting a bus current active component matrix G of a high-voltage frequency converter, and setting G (G1, G2, G3 and G4), wherein G1 is a first preset bus current active component, G2 is a second preset bus current active component, G3 is a third preset bus current active component, G4 is a fourth preset bus current active component, and G1 is more than G2 and less than G3 and less than G4;
presetting a frequency-reducing speed matrix D of a high-voltage frequency converter, and setting D (D1, D2, D3, D4 and D5), wherein D1 is a first preset frequency-reducing speed, D2 is a second preset frequency-reducing speed, D3 is a third preset frequency-reducing speed, D4 is a fourth preset frequency-reducing speed, D5 is a fifth preset frequency-reducing speed, and D1 is more than D2 and less than D3 and less than D4 and less than D5;
setting the frequency reduction speed of the high-voltage frequency converter according to the relation between the bus current active component F of the high-voltage frequency converter and each preset bus current active component:
when F is smaller than G1, selecting the first preset frequency-reducing speed D1 as the frequency-reducing speed of the high-voltage frequency converter;
when G1 is less than or equal to F and less than G2, selecting the second preset frequency-reducing speed D2 as the frequency-reducing speed of the high-voltage frequency converter;
when G2 is less than or equal to F and less than G3, selecting the third preset frequency-reducing speed D3 as the frequency-reducing speed of the high-voltage frequency converter;
when G3 is less than or equal to F and less than G4, selecting the fourth preset frequency-reducing speed D4 as the frequency-reducing speed of the high-voltage frequency converter;
and when G4 is less than or equal to F, selecting the fifth preset frequency reduction speed D5 as the frequency reduction speed of the high-voltage frequency converter.
In this embodiment, when the power grid instantaneous power failure signal is generated, the high-voltage frequency converter is not stopped, and the down-conversion speed of the high-voltage frequency converter is set according to the relation between the bus current active component F of the high-voltage frequency converter and each preset bus current active component.
S140: after the frequency reduction speed of the high-voltage frequency converter is set according to the bus current active component F, a regulator is set according to the high-voltage frequency converter, and the working state of the high-voltage frequency converter is regulated based on the regulator.
In some embodiments of the present application, when a regulator is set according to the high-voltage frequency converter and the high-voltage frequency converter is regulated based on the regulator, the method includes:
after setting the down-conversion speed of the high-voltage frequency converter according to the bus current active component F, the down-conversion speed of the high-voltage frequency converter is Di, i=1, 2,3,4,5;
detecting a voltage reference value of the high-voltage frequency converter;
collecting a frequency-reducing time node corresponding to the frequency-reducing speed Di of the high-voltage frequency converter, taking the frequency-reducing time node as an output initial value of the regulator, and establishing the regulator;
and adjusting the voltage reference value of the high-voltage frequency converter according to the regulator.
In this embodiment, the collection of the down-conversion time node corresponding to the down-conversion speed Di of the high-voltage frequency converter refers to a time node consumed by the down-conversion of the high-voltage frequency converter based on the down-conversion speed Di of the high-voltage frequency converter, and the voltage reference value of the high-voltage frequency converter is adjusted according to the regulator, so that the voltage reference value of the high-voltage frequency converter is located in a preset range, and the high-voltage frequency converter continuously works.
In some embodiments of the application, further comprising:
detecting a second voltage value of the power grid within preset time, and generating a power grid instantaneous start signal when the second voltage value is greater than or equal to the rated voltage value;
and receiving the power grid instantaneous starting signal, closing the regulator, and regulating the operating power of the high-voltage frequency converter based on the frequency-raising speed of the high-voltage frequency converter.
In this embodiment, a second voltage value of the power grid is detected within a preset time, when the second voltage value is greater than or equal to a rated voltage value, the power grid is electrified at this time to generate a power grid instantaneous start signal, the regulator is closed, and the running power of the high-voltage frequency converter is regulated based on the frequency-raising speed of the high-voltage frequency converter, wherein the frequency-raising speed of the high-voltage frequency converter is equal to the frequency-lowering speed of the high-voltage frequency converter, that is, the value of the frequency-lowering speed is taken as the frequency-raising speed of the high-voltage frequency converter.
In order to further explain the technical idea of the application, the technical scheme of the application is described with specific application scenarios.
Correspondingly, as shown in fig. 2, the application also provides a high-voltage variable-frequency instantaneous start-stop control system, which comprises:
the judging module is used for detecting the real-time voltage value of the power grid and judging whether the real-time voltage value is smaller than the rated voltage value, if yes, generating an instantaneous power failure signal of the power grid;
the adjusting module is used for acquiring the rotor rotating speed A of the high-voltage motor and the synchronous rotating speed E of the high-voltage motor when the power grid instantaneous power failure signal is generated, and adjusting the synchronous rotating speed E of the high-voltage motor according to the rotor rotating speed A of the high-voltage motor;
the setting module is used for collecting a bus current active component F of the high-voltage frequency converter and setting the frequency reduction speed of the high-voltage frequency converter according to the bus current active component F;
and the control module is used for setting the frequency reduction speed of the high-voltage frequency converter according to the bus current active component F, setting a regulator according to the high-voltage frequency converter and controlling the working state of the high-voltage frequency converter based on the regulator.
In some embodiments of the application, the adjustment module is specifically configured to:
the adjusting module is used for presetting a rotor speed matrix B of the high-voltage motor, and setting B (B1, B2, B3 and B4), wherein B1 is a first preset rotor speed, B2 is a second preset rotor speed, B3 is a third preset rotor speed, B4 is a fourth preset rotor speed, and B1 is more than B2 and less than B3 and less than B4;
the adjusting module is used for presetting a synchronous rotating speed correction coefficient matrix h of the high-voltage motor, setting h (h 1, h2, h3, h4 and h 5), wherein h1 is a first preset synchronous rotating speed correction coefficient, h2 is a second preset synchronous rotating speed correction coefficient, h3 is a third preset synchronous rotating speed correction coefficient, h4 is a fourth preset synchronous rotating speed correction coefficient, h5 is a fifth preset synchronous rotating speed correction coefficient, and h1 is more than 0.8 and less than h2, h3 and less than h4 and less than h5 and less than 1;
the adjusting module is used for correcting the synchronous rotating speed E of the high-voltage motor according to the relation between the rotating speed A of the rotor of the high-voltage motor and each preset rotating speed of the rotor:
when A is smaller than B1, the first preset synchronous speed correction coefficient h1 is selected to correct the synchronous speed E of the high-voltage motor, and the corrected synchronous speed of the high-voltage motor is E.multidot.h1;
when B1 is less than or equal to A and less than B2, selecting the second preset synchronous rotating speed correction coefficient h2 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.h2;
when B2 is less than or equal to A and less than B3, selecting the third preset synchronous rotating speed correction coefficient h3 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.multidot.h3;
when B3 is less than or equal to A and less than B4, the fourth preset synchronous speed correction coefficient h4 is selected to correct the synchronous speed E of the high-voltage motor, and the corrected synchronous speed of the high-voltage motor is E.h4;
and when B4 is less than or equal to A, selecting the fifth preset synchronous rotating speed correction coefficient h5 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.times.h5.
In some embodiments of the present application, the setting module is specifically configured to:
the setting module is used for presetting a bus current active component matrix G of the high-voltage frequency converter and setting G (G1, G2, G3 and G4), wherein G1 is a first preset bus current active component, G2 is a second preset bus current active component, G3 is a third preset bus current active component, G4 is a fourth preset bus current active component, and G1 is more than G2 and less than G3 and less than G4;
the setting module is used for presetting a frequency-reducing speed matrix D of the high-voltage frequency converter and setting D (D1, D2, D3, D4 and D5), wherein D1 is a first preset frequency-reducing speed, D2 is a second preset frequency-reducing speed, D3 is a third preset frequency-reducing speed, D4 is a fourth preset frequency-reducing speed, D5 is a fifth preset frequency-reducing speed, D1 is more than D2 and less than D3 and less than D4 and less than D5;
the setting module is used for setting the frequency reduction speed of the high-voltage frequency converter according to the relation between the bus current active component F of the high-voltage frequency converter and each preset bus current active component:
when F is smaller than G1, selecting the first preset frequency-reducing speed D1 as the frequency-reducing speed of the high-voltage frequency converter;
when G1 is less than or equal to F and less than G2, selecting the second preset frequency-reducing speed D2 as the frequency-reducing speed of the high-voltage frequency converter;
when G2 is less than or equal to F and less than G3, selecting the third preset frequency-reducing speed D3 as the frequency-reducing speed of the high-voltage frequency converter;
when G3 is less than or equal to F and less than G4, selecting the fourth preset frequency-reducing speed D4 as the frequency-reducing speed of the high-voltage frequency converter;
and when G4 is less than or equal to F, selecting the fifth preset frequency reduction speed D5 as the frequency reduction speed of the high-voltage frequency converter.
In some embodiments of the application, the control module is specifically configured to:
the control module is used for setting the frequency-reducing speed of the high-voltage frequency converter according to the bus current active component F, wherein the frequency-reducing speed of the high-voltage frequency converter is Di, i=1, 2,3,4 and 5;
the control module is used for detecting a voltage reference value of the high-voltage frequency converter;
the control module is used for collecting a frequency-reducing time node corresponding to the frequency-reducing speed Di of the high-voltage frequency converter, taking the frequency-reducing time node as an output initial value of the regulator, and establishing the regulator;
the control module is used for adjusting the voltage reference value of the high-voltage frequency converter according to the adjuster.
In some embodiments of the application, further comprising:
the second adjusting module is used for detecting a second voltage value of the power grid in preset time and generating a power grid instantaneous starting signal when the second voltage value is greater than or equal to the rated voltage value;
the second adjusting module is also used for receiving the power grid instantaneous starting signal, closing the regulator and adjusting the operating power of the high-voltage frequency converter based on the frequency-raising speed of the high-voltage frequency converter.
In summary, the embodiment of the application detects a real-time voltage value of a power grid, judges whether the real-time voltage value is smaller than a rated voltage value, if so, generates a power grid instantaneous power failure signal, acquires a rotor rotating speed A of a high-voltage motor and a synchronous rotating speed E of the high-voltage motor, adjusts the synchronous rotating speed E of the high-voltage motor according to the rotor rotating speed A of the high-voltage motor, acquires a bus current active component F of a high-voltage frequency converter, sets a frequency reduction speed of the high-voltage frequency converter according to the bus current active component F, sets a regulator according to the high-voltage frequency converter after setting the frequency reduction speed of the high-voltage frequency converter according to the bus current active component F, and controls the working state of the high-voltage frequency converter based on the regulator.
In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
Although the application has been described hereinabove with reference to embodiments, various modifications thereof may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the features of the disclosed embodiments may be combined with each other in any manner as long as there is no structural conflict, and the entire description of these combinations is not made in the present specification merely for the sake of omitting the descriptions and saving resources. Therefore, it is intended that the application not be limited to the particular embodiment disclosed, but that the application will include all embodiments falling within the scope of the appended claims.
Those of ordinary skill in the art will appreciate that: the above is only a preferred embodiment of the present application, and the present application is not limited thereto, but it is to be understood that the present application is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method for controlling instantaneous start-up of high-voltage variable frequency, the method comprising:
detecting a real-time voltage value of a power grid, judging whether the real-time voltage value is smaller than a rated voltage value, and if yes, generating an instantaneous power failure signal of the power grid;
when the power grid instantaneous power failure signal is generated, acquiring a rotor rotating speed A of a high-voltage motor and a synchronous rotating speed E of the high-voltage motor, and adjusting the synchronous rotating speed E of the high-voltage motor according to the rotor rotating speed A of the high-voltage motor;
collecting a bus current active component F of a high-voltage frequency converter, and setting the frequency reduction speed of the high-voltage frequency converter according to the bus current active component F;
after the frequency reduction speed of the high-voltage frequency converter is set according to the bus current active component F, a regulator is set according to the high-voltage frequency converter, and the working state of the high-voltage frequency converter is controlled based on the regulator.
2. The high-voltage variable-frequency instantaneous stop-start control method according to claim 1, characterized by comprising, when adjusting the synchronous rotation speed E of the high-voltage motor according to the rotor rotation speed a of the high-voltage motor:
presetting a rotor speed matrix B of a high-voltage motor, and setting B (B1, B2, B3 and B4), wherein B1 is a first preset rotor speed, B2 is a second preset rotor speed, B3 is a third preset rotor speed, B4 is a fourth preset rotor speed, and B1 is more than B2 and less than B3 and less than B4;
presetting a synchronous rotating speed correction coefficient matrix h of a high-voltage motor, and setting h (h 1, h2, h3, h4 and h 5), wherein h1 is a first preset synchronous rotating speed correction coefficient, h2 is a second preset synchronous rotating speed correction coefficient, h3 is a third preset synchronous rotating speed correction coefficient, h4 is a fourth preset synchronous rotating speed correction coefficient, h5 is a fifth preset synchronous rotating speed correction coefficient, and h1 is more than 0.8 and less than h2 and less than h3 and h4 and less than h5 and less than 1;
correcting the synchronous rotating speed E of the high-voltage motor according to the relation between the rotating speed A of the rotor of the high-voltage motor and each preset rotating speed of the rotor:
when A is smaller than B1, the first preset synchronous speed correction coefficient h1 is selected to correct the synchronous speed E of the high-voltage motor, and the corrected synchronous speed of the high-voltage motor is E.multidot.h1;
when B1 is less than or equal to A and less than B2, selecting the second preset synchronous rotating speed correction coefficient h2 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.h2;
when B2 is less than or equal to A and less than B3, selecting the third preset synchronous rotating speed correction coefficient h3 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.multidot.h3;
when B3 is less than or equal to A and less than B4, the fourth preset synchronous speed correction coefficient h4 is selected to correct the synchronous speed E of the high-voltage motor, and the corrected synchronous speed of the high-voltage motor is E.h4;
and when B4 is less than or equal to A, selecting the fifth preset synchronous rotating speed correction coefficient h5 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.times.h5.
3. The method according to claim 1, wherein when setting the down-conversion speed of the high-voltage inverter according to the bus current active component F, comprising:
presetting a bus current active component matrix G of a high-voltage frequency converter, and setting G (G1, G2, G3 and G4), wherein G1 is a first preset bus current active component, G2 is a second preset bus current active component, G3 is a third preset bus current active component, G4 is a fourth preset bus current active component, and G1 is more than G2 and less than G3 and less than G4;
presetting a frequency-reducing speed matrix D of a high-voltage frequency converter, and setting D (D1, D2, D3, D4 and D5), wherein D1 is a first preset frequency-reducing speed, D2 is a second preset frequency-reducing speed, D3 is a third preset frequency-reducing speed, D4 is a fourth preset frequency-reducing speed, D5 is a fifth preset frequency-reducing speed, and D1 is more than D2 and less than D3 and less than D4 and less than D5;
setting the frequency reduction speed of the high-voltage frequency converter according to the relation between the bus current active component F of the high-voltage frequency converter and each preset bus current active component:
when F is smaller than G1, selecting the first preset frequency-reducing speed D1 as the frequency-reducing speed of the high-voltage frequency converter;
when G1 is less than or equal to F and less than G2, selecting the second preset frequency-reducing speed D2 as the frequency-reducing speed of the high-voltage frequency converter;
when G2 is less than or equal to F and less than G3, selecting the third preset frequency-reducing speed D3 as the frequency-reducing speed of the high-voltage frequency converter;
when G3 is less than or equal to F and less than G4, selecting the fourth preset frequency-reducing speed D4 as the frequency-reducing speed of the high-voltage frequency converter;
and when G4 is less than or equal to F, selecting the fifth preset frequency reduction speed D5 as the frequency reduction speed of the high-voltage frequency converter.
4. The method according to claim 1, characterized by comprising, when a regulator is set according to the high-voltage inverter and the high-voltage inverter is controlled based on the regulator:
after setting the down-conversion speed of the high-voltage frequency converter according to the bus current active component F, the down-conversion speed of the high-voltage frequency converter is Di, i=1, 2,3,4,5;
detecting a voltage reference value of the high-voltage frequency converter;
collecting a frequency-reducing time node corresponding to the frequency-reducing speed Di of the high-voltage frequency converter, taking the frequency-reducing time node as an output initial value of the regulator, and establishing the regulator;
and adjusting the voltage reference value of the high-voltage frequency converter according to the regulator.
5. The high-voltage variable-frequency instantaneous start-stop control method according to claim 1, further comprising:
detecting a second voltage value of the power grid within preset time, and generating a power grid instantaneous start signal when the second voltage value is greater than or equal to the rated voltage value;
and receiving the power grid instantaneous starting signal, closing the regulator, and regulating the operating power of the high-voltage frequency converter based on the frequency-raising speed of the high-voltage frequency converter.
6. A high voltage variable frequency transient shutdown control system, the system comprising:
the judging module is used for detecting the real-time voltage value of the power grid and judging whether the real-time voltage value is smaller than the rated voltage value, if yes, generating an instantaneous power failure signal of the power grid;
the adjusting module is used for acquiring the rotor rotating speed A of the high-voltage motor and the synchronous rotating speed E of the high-voltage motor when the power grid instantaneous power failure signal is generated, and adjusting the synchronous rotating speed E of the high-voltage motor according to the rotor rotating speed A of the high-voltage motor;
the setting module is used for collecting a bus current active component F of the high-voltage frequency converter and setting the frequency reduction speed of the high-voltage frequency converter according to the bus current active component F;
and the control module is used for setting the frequency reduction speed of the high-voltage frequency converter according to the bus current active component F, setting a regulator according to the high-voltage frequency converter and controlling the working state of the high-voltage frequency converter based on the regulator.
7. The high-voltage variable-frequency instantaneous start-stop control system according to claim 6, wherein the regulation module is specifically configured to:
the adjusting module is used for presetting a rotor speed matrix B of the high-voltage motor, and setting B (B1, B2, B3 and B4), wherein B1 is a first preset rotor speed, B2 is a second preset rotor speed, B3 is a third preset rotor speed, B4 is a fourth preset rotor speed, and B1 is more than B2 and less than B3 and less than B4;
the adjusting module is used for presetting a synchronous rotating speed correction coefficient matrix h of the high-voltage motor, setting h (h 1, h2, h3, h4 and h 5), wherein h1 is a first preset synchronous rotating speed correction coefficient, h2 is a second preset synchronous rotating speed correction coefficient, h3 is a third preset synchronous rotating speed correction coefficient, h4 is a fourth preset synchronous rotating speed correction coefficient, h5 is a fifth preset synchronous rotating speed correction coefficient, and h1 is more than 0.8 and less than h2, h3 and less than h4 and less than h5 and less than 1;
the adjusting module is used for correcting the synchronous rotating speed E of the high-voltage motor according to the relation between the rotating speed A of the rotor of the high-voltage motor and each preset rotating speed of the rotor:
when A is smaller than B1, the first preset synchronous speed correction coefficient h1 is selected to correct the synchronous speed E of the high-voltage motor, and the corrected synchronous speed of the high-voltage motor is E.multidot.h1;
when B1 is less than or equal to A and less than B2, selecting the second preset synchronous rotating speed correction coefficient h2 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.h2;
when B2 is less than or equal to A and less than B3, selecting the third preset synchronous rotating speed correction coefficient h3 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.multidot.h3;
when B3 is less than or equal to A and less than B4, the fourth preset synchronous speed correction coefficient h4 is selected to correct the synchronous speed E of the high-voltage motor, and the corrected synchronous speed of the high-voltage motor is E.h4;
and when B4 is less than or equal to A, selecting the fifth preset synchronous rotating speed correction coefficient h5 to correct the synchronous rotating speed E of the high-voltage motor, wherein the corrected synchronous rotating speed of the high-voltage motor is E.times.h5.
8. The high-voltage variable-frequency instantaneous start-stop control system according to claim 6, wherein the setting module is specifically configured to:
the setting module is used for presetting a bus current active component matrix G of the high-voltage frequency converter and setting G (G1, G2, G3 and G4), wherein G1 is a first preset bus current active component, G2 is a second preset bus current active component, G3 is a third preset bus current active component, G4 is a fourth preset bus current active component, and G1 is more than G2 and less than G3 and less than G4;
the setting module is used for presetting a frequency-reducing speed matrix D of the high-voltage frequency converter and setting D (D1, D2, D3, D4 and D5), wherein D1 is a first preset frequency-reducing speed, D2 is a second preset frequency-reducing speed, D3 is a third preset frequency-reducing speed, D4 is a fourth preset frequency-reducing speed, D5 is a fifth preset frequency-reducing speed, D1 is more than D2 and less than D3 and less than D4 and less than D5;
the setting module is used for setting the frequency reduction speed of the high-voltage frequency converter according to the relation between the bus current active component F of the high-voltage frequency converter and each preset bus current active component:
when F is smaller than G1, selecting the first preset frequency-reducing speed D1 as the frequency-reducing speed of the high-voltage frequency converter;
when G1 is less than or equal to F and less than G2, selecting the second preset frequency-reducing speed D2 as the frequency-reducing speed of the high-voltage frequency converter;
when G2 is less than or equal to F and less than G3, selecting the third preset frequency-reducing speed D3 as the frequency-reducing speed of the high-voltage frequency converter;
when G3 is less than or equal to F and less than G4, selecting the fourth preset frequency-reducing speed D4 as the frequency-reducing speed of the high-voltage frequency converter;
and when G4 is less than or equal to F, selecting the fifth preset frequency reduction speed D5 as the frequency reduction speed of the high-voltage frequency converter.
9. The high voltage variable frequency transient shutdown control system of claim 6, wherein the control module is specifically configured to:
the control module is used for setting the frequency-reducing speed of the high-voltage frequency converter according to the bus current active component F, wherein the frequency-reducing speed of the high-voltage frequency converter is Di, i=1, 2,3,4 and 5;
the control module is used for detecting a voltage reference value of the high-voltage frequency converter;
the control module is used for collecting a frequency-reducing time node corresponding to the frequency-reducing speed Di of the high-voltage frequency converter, taking the frequency-reducing time node as an output initial value of the regulator, and establishing the regulator;
the control module is used for adjusting the voltage reference value of the high-voltage frequency converter according to the adjuster.
10. The high voltage variable frequency transient shutdown control system of claim 6, further comprising:
the second adjusting module is used for detecting a second voltage value of the power grid in preset time and generating a power grid instantaneous starting signal when the second voltage value is greater than or equal to the rated voltage value;
the second adjusting module is also used for receiving the power grid instantaneous starting signal, closing the regulator and adjusting the operating power of the high-voltage frequency converter based on the frequency-raising speed of the high-voltage frequency converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310479424.XA CN116707291A (en) | 2023-04-25 | 2023-04-25 | Instantaneous start-stop control method and system for high-voltage frequency conversion |
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| CN202310479424.XA CN116707291A (en) | 2023-04-25 | 2023-04-25 | Instantaneous start-stop control method and system for high-voltage frequency conversion |
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