CN114465545A - Power control method of frequency converter - Google Patents
Power control method of frequency converter Download PDFInfo
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- CN114465545A CN114465545A CN202210167404.4A CN202210167404A CN114465545A CN 114465545 A CN114465545 A CN 114465545A CN 202210167404 A CN202210167404 A CN 202210167404A CN 114465545 A CN114465545 A CN 114465545A
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- power
- frequency converter
- preset
- output
- frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a power control method of a frequency converter, which comprises the following steps: acquiring the output frequency and the input power of a frequency converter within a first preset time, and controlling the output frequency of the frequency converter to be a preset waiting frequency; step two: according to the comparison between the input power of the frequency converter and the preset power, judging whether a preset power limiting mode is needed to control the output power of the frequency converter or not, so that the output power is kept in a fluctuation interval, and performing the third step: compared with the existing frequency conversion control method, the frequency conversion power control method can quickly and effectively control the output power of frequency conversion, and meanwhile, the authority of controlling the rotating speed of the motor can ensure the rotating speed of the motor under special conditions of the motor according to the motor, so that the purpose of controlling the power of the frequency converter is achieved through effective, convenient and stable control.
Description
Technical Field
The invention relates to the technical field of frequency converters, in particular to a power control method of a frequency converter.
Background
The frequency converter is generally applied to motor speed regulation in the industrial field, is an executing device commonly used in the industrial field, and has good speed regulation performance and simple and convenient control mode. Therefore, the system is widely applied in an automatic system, such as industries of water supply, power generation, metallurgy, mining, traffic and the like, the performance of the system is directly related to normal production and product quality of users, for example, in the traction of a railway electric locomotive, a frequency converter directly influences whether the acceleration and deceleration of the locomotive in advancing are smooth, whether the locomotive can be accelerated to a required speed, whether the constant-speed running is stable, whether enough traction force meets the requirement of climbing of a train and the like.
The AC-DC-AC frequency converter is the main form of the current AC motor frequency conversion speed regulation power supply, and can be divided into a controllable rectifying circuit voltage transformation and an uncontrollable rectifying circuit, the uncontrollable rectifying circuit becomes the mainstream because the controllable rectifying circuit voltage transformation output harmonic wave is large, and the power can not be limited directly by limiting the input current because the rectifying circuit is the uncontrollable rectifying circuit in the use of the frequency converter, which causes more difficulties in the control of the motor and simultaneously easily causes the frequency converter to break down.
Disclosure of Invention
Therefore, the invention provides a power control method of the frequency converter, and the control method of the frequency converter is optimized.
A power control method of a frequency converter comprises the following steps:
the method comprises the following steps: acquiring the output frequency and the input power of a frequency converter within a first preset time, and controlling the output frequency of the frequency converter to be a preset waiting frequency;
step two: according to the comparison between the input power of the frequency converter and the preset power, judging whether a preset power limiting mode is needed to be adopted to control the output power of the frequency converter or not, so that the output power is kept in a fluctuation interval, if the output power is in the fluctuation interval of the preset power and the duration is the same as the first preset time, not starting the power limiting mode, and if the output power of the frequency converter is larger than or smaller than the fluctuation interval of the preset power and the duration is the same as the first preset time, adopting the power limiting mode;
step three: and detecting the rotating speed of the motor after the output power reaches the preset power, and controlling the frequency converter according to the rotating speed of the motor if the output power fluctuation value is within the preset power fluctuation value interval so that the detected rotating speed of the motor is greater than a preset value.
Specifically, the power limiting mode, according to a comparison between a current input power and a preset power, if the input power is smaller than a minimum value of a fluctuation interval of the preset power, increases the output frequency of the frequency converter to increase the output power of the frequency converter to ensure that the output frequency is kept within a fluctuation range of the preset power, and if the input power is larger than a maximum value of the fluctuation interval of the preset power, decreases the output frequency of the frequency converter to increase the output power of the frequency converter to ensure that the output power is kept within the fluctuation range of the preset power.
Specifically, the preset fluctuation interval is (91% -100%).
Compared with the existing frequency conversion control method, the frequency conversion control method can quickly and effectively control the output power of frequency conversion, and meanwhile, the authority of controlling the rotating speed of the motor can ensure the rotating speed of the motor according to the special condition of the motor, so that the purpose of controlling the power of the frequency converter is achieved by effective, convenient and stable control.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a power control method of a frequency converter includes the following steps:
the method comprises the following steps: acquiring the output frequency and the input power of a frequency converter within a first preset time, and controlling the output frequency of the frequency converter to be a preset waiting frequency;
step two: according to the comparison between the input power of the frequency converter and the preset power, judging whether a preset power limiting mode is needed to be adopted to control the output power of the frequency converter or not, so that the output power is kept in a fluctuation interval, if the output power is in the fluctuation interval of the preset power and the duration is the same as the first preset time, not starting the power limiting mode, and if the output power of the frequency converter is larger than or smaller than the fluctuation interval of the preset power and the duration is the same as the first preset time, adopting the power limiting mode;
step three: and detecting the rotating speed of the motor after the output power reaches the preset power, and controlling the frequency converter according to the rotating speed of the motor if the output power fluctuation value is within the preset power fluctuation value interval so that the detected rotating speed of the motor is greater than a preset value.
And the power limiting mode is used for increasing the output frequency of the frequency converter to increase the output power of the frequency converter according to the comparison between the current input power and the preset power, if the input power is smaller than the minimum value of the fluctuation interval of the preset power, so as to ensure that the output frequency is kept in the fluctuation range of the preset power, and if the input power is larger than the maximum value of the fluctuation interval of the preset power, the power limiting mode is used for reducing the output frequency of the frequency converter to increase the output power of the frequency converter to ensure that the output power is kept in the fluctuation range of the preset power.
The preset fluctuation interval is (91% -100%).
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A power control method of a frequency converter is characterized by comprising the following steps:
the method comprises the following steps: acquiring the output frequency and the input power of a frequency converter within a first preset time, and controlling the output frequency of the frequency converter to be a preset waiting frequency;
step two: according to the comparison between the input power of the frequency converter and the preset power, judging whether a preset power limiting mode is needed to be adopted to control the output power of the frequency converter or not, so that the output power is kept in a fluctuation interval, if the output power is in the fluctuation interval of the preset power and the duration is the same as the first preset time, not starting the power limiting mode, and if the output power of the frequency converter is larger than or smaller than the fluctuation interval of the preset power and the duration is the same as the first preset time, adopting the power limiting mode;
step three: and detecting the rotating speed of the motor after the output power reaches the preset power, and controlling the frequency converter according to the rotating speed of the motor if the output power fluctuation value is within the preset power fluctuation value interval so that the detected rotating speed of the motor is greater than a preset value.
2. The method as claimed in claim 1, wherein the power limiting mode increases the output frequency of the frequency converter to increase the output power of the frequency converter according to the comparison between the current input power and the preset power, if the input power is smaller than the minimum value of the fluctuation interval of the preset power, so as to ensure that the output frequency is kept within the fluctuation range of the preset power, and if the input power is larger than the maximum value of the fluctuation interval of the preset power, the power limiting mode decreases the output frequency of the frequency converter to increase the output power of the frequency converter to ensure that the output power is kept within the fluctuation range of the preset power.
3. The power control method of the frequency converter according to claim 1, wherein the preset fluctuation interval is (91% -100%).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210167404.4A CN114465545A (en) | 2022-02-23 | 2022-02-23 | Power control method of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210167404.4A CN114465545A (en) | 2022-02-23 | 2022-02-23 | Power control method of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114465545A true CN114465545A (en) | 2022-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210167404.4A Pending CN114465545A (en) | 2022-02-23 | 2022-02-23 | Power control method of frequency converter |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682828A (en) * | 2015-02-11 | 2015-06-03 | 广东威灵电机制造有限公司 | Motor power limitation method and motor control system |
| CN105958835A (en) * | 2016-06-28 | 2016-09-21 | 国电南京自动化股份有限公司 | Instantaneous power control-based high-voltage converter power failure crossing method |
| CN205847108U (en) * | 2016-06-28 | 2016-12-28 | 国电南京自动化股份有限公司 | A kind of high voltage converter based on instantaneous power control |
| CN109327179A (en) * | 2017-07-31 | 2019-02-12 | 株洲中车时代电气股份有限公司 | A kind of transducer power control method and frequency changer controller |
| CN109357436A (en) * | 2018-10-18 | 2019-02-19 | 佛山市顺德区和而泰电子科技有限公司 | Frequency conversion heat pump control method |
| CN111130421A (en) * | 2018-10-12 | 2020-05-08 | 乐星电气(无锡)有限公司 | Frequency converter control method |
| CN112054744A (en) * | 2020-09-18 | 2020-12-08 | 中国第一汽车股份有限公司 | Inverter temperature control method, system, vehicle and medium |
-
2022
- 2022-02-23 CN CN202210167404.4A patent/CN114465545A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682828A (en) * | 2015-02-11 | 2015-06-03 | 广东威灵电机制造有限公司 | Motor power limitation method and motor control system |
| CN105958835A (en) * | 2016-06-28 | 2016-09-21 | 国电南京自动化股份有限公司 | Instantaneous power control-based high-voltage converter power failure crossing method |
| CN205847108U (en) * | 2016-06-28 | 2016-12-28 | 国电南京自动化股份有限公司 | A kind of high voltage converter based on instantaneous power control |
| CN109327179A (en) * | 2017-07-31 | 2019-02-12 | 株洲中车时代电气股份有限公司 | A kind of transducer power control method and frequency changer controller |
| CN111130421A (en) * | 2018-10-12 | 2020-05-08 | 乐星电气(无锡)有限公司 | Frequency converter control method |
| CN109357436A (en) * | 2018-10-18 | 2019-02-19 | 佛山市顺德区和而泰电子科技有限公司 | Frequency conversion heat pump control method |
| CN112054744A (en) * | 2020-09-18 | 2020-12-08 | 中国第一汽车股份有限公司 | Inverter temperature control method, system, vehicle and medium |
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