CN113411033A - Method for judging input overvoltage of load with motor of frequency converter - Google Patents
Method for judging input overvoltage of load with motor of frequency converter Download PDFInfo
- Publication number
- CN113411033A CN113411033A CN202110802517.2A CN202110802517A CN113411033A CN 113411033 A CN113411033 A CN 113411033A CN 202110802517 A CN202110802517 A CN 202110802517A CN 113411033 A CN113411033 A CN 113411033A
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- Prior art keywords
- overvoltage
- frequency converter
- motor
- load
- input
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000001629 suppression Effects 0.000 claims abstract description 9
- 238000011084 recovery Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/0241—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an overvoltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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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)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention relates to a method for judging overvoltage of load input of a frequency converter with a motor, and belongs to the field of power electronics. The method is characterized in that overvoltage caused by over-fast speed reduction is quickly restrained and controlled by detecting the direct-current bus voltage of the frequency converter and combining with the load working condition of the motor, so that the overvoltage state of the input side of the frequency converter is differentially judged. The invention mainly solves the problem of fault location of overvoltage suppression control failure caused by the fact that overvoltage on the input side enables the direct-current bus voltage of a unit to be in a primary overvoltage state for a long time when an input voltage detection device is absent in a frequency converter.
Description
Technical Field
The invention belongs to the field of power electronics, and relates to a method for judging input overvoltage of a load with a motor of a frequency converter.
Background
The frequency converter has the characteristics of adjustable voltage and frequency, can optimize the starting performance in a motion control system, improves the operation efficiency, and plays the roles of saving electricity and energy. The direct current side of a power unit of the frequency converter adopts a rectifier bridge and a capacitor bank for voltage stabilization, and the voltage of a direct current bus can be increased by reverse charging when the load of a motor is decelerated too fast, so that the pumping of the direct current bus voltage of the unit can be quickly inhibited by adopting various overvoltage inhibition methods. However, when the input side voltage of the frequency converter is continuously maintained in a high state, the overvoltage suppression control is failed, and finally, a fault that the reason cannot be located occurs.
Therefore, a necessary method is needed to judge the overvoltage state of the input side, the traditional monitoring method is to add a voltage detection device on the input side, the product cost is increased, hardware fault points are increased, and the overall structure modification may be involved in some old equipment occasions.
Disclosure of Invention
In view of the above, the present invention provides a method for determining an input overvoltage of a load with a motor of an inverter.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for judging the input overvoltage of a load with a motor of a frequency converter specifically comprises the following steps:
s1: the system detects the direct-current bus voltage of the frequency converter and uploads the direct-current bus voltage to the main controller;
s2: sampling and calculating to obtain direct current bus voltage Udc;
s3: judging that Udc is greater than a primary overvoltage set value OV1 and less than a secondary overvoltage set value OV 2; the overvoltage counter continuously increases the count;
s4: judging whether the motor load is in a speed reduction working condition, and performing overvoltage suppression control;
s5: when the Udc recovery is judged to be less than a primary overvoltage set value OV1, the overvoltage counter is cleared;
s6: when the overvoltage counter is judged to exceed a set threshold value, an overvoltage alarm is prompted to be sent to the input side;
s7: and when the Udc is judged to be larger than the secondary overvoltage set value OV2, the frequency converter is tripped due to faults.
Optionally, in S4, the overvoltage suppression control method includes: and calculating Udc-OV1 to obtain a voltage difference signal deltV which is used as the input of the PD controller, superposing the output signal to the output frequency of the frequency converter, slowing down the speed reduction rate of the motor and quickly recovering the voltage of the unit direct-current bus.
The invention has the beneficial effects that: the invention solves the problem of monitoring the overvoltage at the input side when the frequency converter is lack of an input voltage detection device, and can distinguish the pumping up of the direct current bus voltage caused by the over-fast speed reduction.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of a method for judging overvoltage of a load with a motor of a frequency converter according to the invention;
FIG. 2 is a schematic diagram of the deceleration overvoltage suppression control;
fig. 3 shows an embodiment of a high-voltage inverter with electromechanical load system.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 3, fig. 3 shows a high voltage inverter with a motor load system according to the present embodiment, an input side of the inverter is connected to a 10kV adjustable power supply, the inverter is a 9-level H-bridge unit with a secondary side of 660V and is cascaded to the high voltage inverter to drive a 2000kW motor, and an interrupt period of the controller is 416 us.
Fig. 1 is a flowchart of a method for monitoring overvoltage of a motor-loaded high-voltage inverter in this embodiment, and includes the following steps:
1. the frequency converter with motor load runs at full speed;
2. the system detects the direct current voltage of each unit through a Hall circuit and uploads the direct current voltage to the main controller through optical fiber communication;
3. the main controller analyzes to obtain the maximum unit direct current voltage Umax;
4. setting the speed reduction time to be 20s, and sending a speed reduction instruction to the frequency converter;
5. judging that Udcmax is larger than a primary overvoltage set value OV1 and smaller than a secondary overvoltage set value OV 2; the overvoltage counter continuously increases the count;
6. at the moment, the speed reduction working condition is adopted, and the frequency converter enters speed reduction overvoltage suppression control: the voltage difference signal Umax-OV1 is used as the input of the PD controller, the output signal is superposed on the output frequency of the frequency converter, and the deceleration speed is reduced
7. When the Udcmax is recovered to be smaller than the primary overvoltage set value OV1, clearing the overvoltage counter;
8. observing that the maximum value of the overvoltage counter is 200-250, namely the corresponding time of overvoltage suppression treatment is about 80-100 ms;
9. setting an input overvoltage judgment threshold value as 1200 continuous counting of an overvoltage counter, namely lasting for about 500 ms;
10. controlling the frequency converter with the motor to run at full speed again;
11. gradually heightening the input side voltage-regulating power supply;
12. judging that Udcmax is larger than a primary overvoltage set value OV1 and smaller than a secondary overvoltage set value OV 2; the overvoltage counter continuously increases the count;
13. when the overvoltage counter is judged to exceed a set threshold value 1200, an overvoltage alarm is prompted on the input side;
14. and when the Udcmax is judged to be larger than the secondary overvoltage set value OV2, the frequency converter is tripped due to faults.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (2)
1. A method for judging the input overvoltage of a load with a motor of a frequency converter is characterized by comprising the following steps: the method specifically comprises the following steps:
s1: the system detects the direct-current bus voltage of the frequency converter and uploads the direct-current bus voltage to the main controller;
s2: sampling and calculating to obtain direct current bus voltage Udc;
s3: judging that Udc is greater than a primary overvoltage set value OV1 and less than a secondary overvoltage set value OV 2; the overvoltage counter continuously increases the count;
s4: judging whether the motor load is in a speed reduction working condition, and performing overvoltage suppression control;
s5: when the Udc recovery is judged to be less than a primary overvoltage set value OV1, the overvoltage counter is cleared;
s6: when the overvoltage counter is judged to exceed a set threshold value, an overvoltage alarm is prompted to be sent to the input side;
s7: and when the Udc is judged to be larger than the secondary overvoltage set value OV2, the frequency converter is tripped due to faults.
2. The method for judging the input overvoltage of the load with the motor of the frequency converter according to claim 1, characterized in that: in S4, the overvoltage suppression control method includes: and calculating Udc-OV1 to obtain a voltage difference signal deltV which is used as the input of the PD controller, superposing the output signal to the output frequency of the frequency converter, slowing down the speed reduction rate of the motor and quickly recovering the voltage of the unit direct-current bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802517.2A CN113411033A (en) | 2021-07-15 | 2021-07-15 | Method for judging input overvoltage of load with motor of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802517.2A CN113411033A (en) | 2021-07-15 | 2021-07-15 | Method for judging input overvoltage of load with motor of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113411033A true CN113411033A (en) | 2021-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110802517.2A Pending CN113411033A (en) | 2021-07-15 | 2021-07-15 | Method for judging input overvoltage of load with motor of frequency converter |
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| Country | Link |
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| CN (1) | CN113411033A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103501135A (en) * | 2013-10-15 | 2014-01-08 | 苏州汇川技术有限公司 | High-voltage frequency converter braking deceleration protection system and method |
| CN104104304A (en) * | 2013-04-09 | 2014-10-15 | 山洋电气株式会社 | Motor control device |
| CN105850024A (en) * | 2013-12-27 | 2016-08-10 | 株式会社日立产机系统 | Power conversion device |
| CN206099314U (en) * | 2016-09-08 | 2017-04-12 | 西门子（中国）有限公司 | Overvoltage protection subassembly of converter and converter subassembly thereof |
| CN107836077A (en) * | 2015-07-09 | 2018-03-23 | 三菱电机株式会社 | Control device of electric motor |
| CN110350486A (en) * | 2019-07-19 | 2019-10-18 | 广东美的暖通设备有限公司 | Failure protecting device, frequency converter and motor driven systems |
| CN112448370A (en) * | 2019-09-04 | 2021-03-05 | 厦门市必易微电子技术有限公司 | Primary side control circuit and control method and isolated power supply conversion circuit |
| CN112448630A (en) * | 2019-09-05 | 2021-03-05 | 麦克维尔空调制冷(武汉)有限公司 | Deceleration overvoltage suppression method for asynchronous variable frequency motor |
| CN112688359A (en) * | 2020-12-08 | 2021-04-20 | 日立电梯（中国）有限公司 | Elevator power failure detection method, equipment, device and storage medium |
-
2021
- 2021-07-15 CN CN202110802517.2A patent/CN113411033A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104304A (en) * | 2013-04-09 | 2014-10-15 | 山洋电气株式会社 | Motor control device |
| CN103501135A (en) * | 2013-10-15 | 2014-01-08 | 苏州汇川技术有限公司 | High-voltage frequency converter braking deceleration protection system and method |
| CN105850024A (en) * | 2013-12-27 | 2016-08-10 | 株式会社日立产机系统 | Power conversion device |
| CN107836077A (en) * | 2015-07-09 | 2018-03-23 | 三菱电机株式会社 | Control device of electric motor |
| CN206099314U (en) * | 2016-09-08 | 2017-04-12 | 西门子（中国）有限公司 | Overvoltage protection subassembly of converter and converter subassembly thereof |
| CN110350486A (en) * | 2019-07-19 | 2019-10-18 | 广东美的暖通设备有限公司 | Failure protecting device, frequency converter and motor driven systems |
| CN112448370A (en) * | 2019-09-04 | 2021-03-05 | 厦门市必易微电子技术有限公司 | Primary side control circuit and control method and isolated power supply conversion circuit |
| CN112448630A (en) * | 2019-09-05 | 2021-03-05 | 麦克维尔空调制冷(武汉)有限公司 | Deceleration overvoltage suppression method for asynchronous variable frequency motor |
| CN112688359A (en) * | 2020-12-08 | 2021-04-20 | 日立电梯（中国）有限公司 | Elevator power failure detection method, equipment, device and storage medium |
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Application publication date: 20210917 |
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