CN112332374A - Overvoltage shutdown protection method and device - Google Patents
Overvoltage shutdown protection method and device Download PDFInfo
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- CN112332374A CN112332374A CN202011187307.9A CN202011187307A CN112332374A CN 112332374 A CN112332374 A CN 112332374A CN 202011187307 A CN202011187307 A CN 202011187307A CN 112332374 A CN112332374 A CN 112332374A
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- 239000003990 capacitor Substances 0.000 claims description 16
- 238000004804 winding Methods 0.000 claims description 13
- 238000004590 computer program Methods 0.000 claims description 6
- 230000005347 demagnetization Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002457 bidirectional effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
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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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Abstract
The invention discloses a protection method and a protection device for overvoltage shutdown. The protection method for overvoltage shutdown comprises the following steps: under the condition of receiving a shutdown instruction, judging whether the running frequency of a compressor to be subjected to shutdown reaches a preset protection frequency or not; and when the running frequency reaches a preset protection frequency, using a safety mode of overvoltage shutdown to perform shutdown protection. On the basis of no need of adding extra circuits and devices, the invention carries out energy bidirectional dissipation by a protection control mode of pre-voltage reduction and active short circuit, has good protection effect on the overvoltage shutdown of the compressor, and improves the reliability of the system.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a protection method and a protection device for overvoltage shutdown.
Background
With the improvement of the energy efficiency grade of the air conditioner and the increasing requirements on energy conservation and emission reduction, the permanent magnet motor has a better energy efficiency ratio, so that the permanent magnet motor is continuously applied to the air conditioner industry. However, because the counter electromotive force of the compressor is high, especially when the compressor is shut down manually at high frequency or is shut down in high frequency protection, the braking regenerative energy of the compressor can reversely charge the hardware system, which causes the problem of overvoltage of the direct current bus and causes impact on the hardware system, thereby reducing the reliability of the system and the service life. How to properly solve the above problems is an urgent issue to be solved in the industry.
Disclosure of Invention
The invention provides a protection method and a protection device for overvoltage shutdown, which are used for performing energy bidirectional dissipation through a protection control mode of pre-voltage reduction and active short circuit on the basis of not adding extra circuits and devices, and have a good protection effect on the overvoltage shutdown of a compressor.
According to a first aspect of embodiments of the present invention, there is provided a protection method of overvoltage shutdown, including:
under the condition of receiving a shutdown instruction, judging whether the running frequency of a compressor to be subjected to shutdown reaches a preset protection frequency or not;
and when the running frequency reaches a preset protection frequency, using a safety mode of overvoltage shutdown to perform shutdown protection.
In one embodiment, the shutdown protection using the safety mode of overvoltage shutdown when the operated frequency reaches a preset protection frequency includes:
when the running frequency reaches a preset protection frequency, reducing the voltage value of the direct current bus;
and executing safe shutdown operation under the condition that the voltage value of the direct current bus reaches a bus high-voltage safety value.
In one embodiment, the reducing the voltage value of the dc bus when the operating frequency reaches a preset protection frequency includes:
when the operating frequency reaches a preset protection frequency, calculating an overvoltage value according to the operating frequency;
and reducing the bus voltage from the overvoltage value to a preset bus high-voltage safety value.
In one embodiment, the reducing the bus voltage from the overvoltage value to a preset bus high voltage safety value includes:
and stably reducing the bus voltage from the overvoltage value to a preset bus high-voltage safety value within the inherent safe voltage reduction duration of the compressor by adjusting the duty ratio of a PWM (pulse width modulation) driving signal of the digital PFC.
In one embodiment, said performing a safety shutdown operation in case the voltage value of the dc bus reaches a bus high voltage safety value comprises:
under the condition that the voltage value of the direct current bus reaches a bus high-voltage safety value, monitoring the voltage value of an electrolytic capacitor of the compressor in real time, and executing shutdown operation;
and when the voltage value of the electrolytic capacitor reaches the preset bus high-voltage safety value, executing active short-circuit control, so that the residual electric energy generated when the compressor is stopped is consumed in a motor winding.
In one embodiment, when the voltage value of the electrolytic capacitor reaches the preset bus high-voltage safety value, the active short-circuit control is executed so that the residual electric energy generated when the compressor is stopped is consumed in a motor winding, and the method comprises the following steps:
when the voltage value of the electrolytic capacitor reaches the preset bus high-voltage safety value, executing active short-circuit control;
and controlling the current in the motor winding through the duty ratio of the PWM driving signal so that the current does not exceed the demagnetization current preset by the compressor.
According to a second aspect of the embodiments of the present invention, there is provided a protection device for overvoltage shutdown, including:
the judging module is used for judging whether the running frequency of the compressor to be stopped reaches a preset protection frequency or not;
and the protection module is used for performing shutdown protection by using an overvoltage shutdown safety mode when the running frequency reaches a preset protection frequency.
In one embodiment, further comprising: the judging module and the protecting module are controlled to execute the protecting method in any one of the above embodiments.
According to a third aspect of embodiments of the present invention, an electronic device is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements the steps of the method provided in the first aspect when executing the program.
According to a fourth aspect of embodiments of the present invention, there is also provided a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method as provided by the first aspect.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart illustrating a method of protecting against an overvoltage shutdown in accordance with an exemplary embodiment of the present invention;
fig. 2 is a flowchart illustrating a step S12 of a method for protecting against an overvoltage shutdown in accordance with an exemplary embodiment of the present invention;
fig. 3 is a flowchart illustrating a step S21 of a method for protecting against an overvoltage shutdown in accordance with an exemplary embodiment of the present invention;
fig. 4 is a flowchart illustrating a step S32 of a method for protecting against an overvoltage shutdown in accordance with an exemplary embodiment of the present invention;
fig. 5 is a flowchart illustrating a step S22 of a method for protecting against an overvoltage shutdown in accordance with an exemplary embodiment of the present invention;
fig. 6 is a block diagram illustrating a step S52 of the overvoltage shutdown protection device in accordance with an exemplary embodiment of the present invention;
FIG. 7 is an apparatus diagram illustrating a method of protecting against over-voltage shutdown in accordance with an exemplary embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Fig. 1 is a flowchart illustrating a method of protecting against an overvoltage shutdown, according to an exemplary embodiment, as shown in fig. 1, including the following steps S11-S12:
in step S11, in the case of receiving the stop instruction, it is determined whether the operating frequency of the compressor to be stopped reaches a preset protection frequency;
in step S12, shutdown protection is performed using a safety mode of overvoltage shutdown when the operated frequency reaches a preset protection frequency.
In one embodiment, the compressor in the present embodiment may be applied to any device, and for convenience, an air conditioner is taken as an example in the technical solution of the present application. Before the compressor (especially a high-back compressor) is operated at a high frequency and stopped, the bus voltage is reduced, and then active short-circuit control is executed, so that the influence caused by regenerative braking energy generated when the compressor is stopped is controlled within a certain range. By adopting the technical scheme in the embodiment, the influence caused by overvoltage generated by shutdown of the compressor can be avoided, extra devices are not required to be added or the specification of hardware is not required to be improved, and the operation reliability of the compressor is improved in a cost-free mode.
Under the condition of receiving a stop instruction, firstly, the current running frequency of the compressor is read, and then whether the running frequency reaches the set protection frequency is judged. Since the compressor operating frequency is proportional to the value of the overvoltage generated when it is stopped. Therefore, when the operating frequency does not exceed the set value, the normal shutdown mode can be adopted. When the operating frequency is higher than the set protection frequency, the energy generated during shutdown is dissipated by adopting the safety mode of overvoltage shutdown in the embodiment.
According to the technical scheme in the embodiment, energy bidirectional dissipation is performed in a pre-step-down and active short circuit protection control mode on the basis of not adding extra circuits and devices, so that the compressor overvoltage shutdown protection device has a good protection effect, and the reliability of a system is improved.
In one embodiment, as shown in FIG. 2, step S12 includes the following steps S21-S22:
in step S21, when the operating frequency reaches a preset protection frequency, decreasing the voltage value of the dc bus;
in step S22, in a case where the voltage value of the dc bus reaches a bus high voltage safety value, a safety shutdown operation is performed.
In one embodiment, the protection scheme for the overvoltage shutdown is mainly divided into reducing the voltage value of the direct current bus and consuming the electric energy generated when the compressor is shut down. The high frequency operation mode of the compressor is generally an internal heating mode at an external low temperature. When the outdoor unit is defrosted or a user sends a shutdown instruction, the air conditioner generates a shutdown instruction to close the compressor. Different compressors have different motor parameters such as back electromotive force coefficients, line-to-line resistances, dq-axis inductances, and the like, so that different preset protection frequencies should be set according to the characteristics of the different compressors, and the preset protection frequencies can be determined through multiple experiments. And under the condition that the voltage value of the direct current bus reaches the bus high-voltage safety value, the electric energy generated when the compressor is shut down is safely and reliably consumed.
In one embodiment, as shown in FIG. 3, step S21 includes the following steps S31-S32:
in step S31, when the operating frequency reaches a preset protection frequency, calculating an overvoltage value according to the operating frequency;
in step S32, the bus voltage is reduced from the overvoltage value to a preset bus high voltage safety value.
In one embodiment, the overvoltage energy of the compressor at the time of shutdown is generated by cutting magnetic induction lines by wires, and the compressor is equivalent to a generator and is in a state of generating electric energy. The overvoltage value is proportional to the operating frequency, so that the overvoltage value can be estimated by the operating frequency which is stably operated immediately before the shutdown. The specific calculation formula is as follows:
U＝2πfPnKe (1)
in formula (1), the symbol U is an overvoltage value, the symbol f is an operating frequency, and the symbol P isnIs a number of polar pairs, symbol KeIs the back electromotive force coefficient. It can be seen that the overvoltage value U is proportional to the operating frequency f.
Preset bus high voltage safety value USecureIs at the high voltage protection value U of the bus voltageProtection ofOn the basis of (1), subtracting a preset voltage margin UMargin valueObtained is not only USecure＝UProtection of-UMargin value. Reducing the bus voltage from the overvoltage value U to a preset bus high-voltage safety value USecureThe voltage value U to be reducedReduce＝U-USecure. And the compressor is stopped after the bus voltage is reduced, so that the overshoot does not exceed the rated value of the electrolytic capacitor, and the influence of voltage overshoot on a hardware system when the compressor is stopped is avoided.
In one embodiment, as shown in FIG. 4, step S32 includes the following step S41:
in step S41, the bus voltage is smoothly decreased from the overvoltage value to a preset bus high voltage safety value within an intrinsic safety step-down duration of the compressor by adjusting a duty ratio of a PWM driving signal of the digital PFC.
In one embodiment, the bus voltage should be gently decreased because the instantaneous drop amount of the bus voltage is too large, which may have some effect on the stability of the compressor. However, this can extend the down time, which can affect energy consumption and comfort. The dc bus voltage can be controlled by adjusting the duty ratio of a PWM (Pulse width modulation) driving signal of a digital PFC (Power factor correction). Therefore, within the inherent safe voltage reduction time of the compressor, the speed of bus voltage reduction is stably controlled, the shutdown delay is shortened as much as possible on the basis of not influencing the stability of the compressor, the perception of a user is reduced, and the use experience of the user is improved.
In one embodiment, as shown in FIG. 5, step S22 includes the following steps S51-S52:
in step S51, in the case that the voltage value of the dc bus reaches the bus safety voltage value, monitoring the voltage value of the electrolytic capacitor of the compressor in real time, and performing a shutdown operation;
in step S52, when the voltage value of the electrolytic capacitor reaches the preset bus high-voltage safety value, performing active short-circuit control so that the residual electric energy generated when the compressor is stopped is consumed in the motor winding.
In one embodiment, in the case that the voltage value of the direct current bus reaches the bus safety voltage value, the shutdown operation is started, and a part of energy generated by the shutdown of the compressor charges the electrolytic capacitor, so that the voltage of the electrolytic capacitor is pumped up. And when the voltage value of the electrolytic capacitor rises to a preset bus high-voltage safety value, executing active short-circuit control, and dissipating the residual electric energy generated when the compressor is shut down in a heating mode through a motor winding.
In one embodiment, as shown in FIG. 6, step 52 includes the following steps S61-S62:
in step S61, when the voltage value of the electrolytic capacitor reaches the preset bus high-voltage safety value, performing active short-circuit control;
in step S62, the current in the motor winding is controlled by the duty ratio of the PWM driving signal so as not to exceed the demagnetization current preset by the compressor.
In one embodiment, when the voltage value of the electrolytic capacitor reaches the preset bus high-voltage safety value, active short-circuit control is executed. The current in the motor winding cannot exceed the demagnetization current preset by the compressor, and the specific adjustment mode is to adjust and control the current in the motor winding through a PWM duty ratio. The formula for the calculation of the flow through the compressor motor winding is as follows:
wherein, the symbol D is PWM duty ratio, and the symbol UDCIs a DC bus voltage, symbol R1、R2、 R3The resistances between three coil lines of the compressor are respectively represented by the symbol R1、R2、R3Forming the motor winding.
In one embodiment, fig. 7 is a block diagram of an overvoltage shutdown protection device, shown in accordance with an exemplary embodiment. As shown in fig. 7, the apparatus includes a judgment module 71 and a protection module 72.
The judging module 71 is configured to, in a case where the shutdown instruction is received, judge whether an operating frequency of the compressor to be shutdown reaches a preset protection frequency;
the protection module 72 is configured to perform shutdown protection using a safety mode of overvoltage shutdown when the operating frequency reaches a preset protection frequency.
The judging module 71 and the protection module 72 included in the overvoltage protection device are controlled to execute the overvoltage protection method set forth in any one of the above embodiments.
Fig. 8 illustrates a physical structure diagram of a server, and as shown in fig. 8, the server may include: a processor (processor)810, a communication Interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication Interface 820 and the memory 830 communicate with each other via the communication bus 840. The processor 810 may call logic instructions in the memory 830 to perform the following method: under the condition of receiving a shutdown instruction, judging whether the running frequency of a compressor to be subjected to shutdown reaches a preset protection frequency or not; and when the running frequency reaches a preset protection frequency, using a safety mode of overvoltage shutdown to perform shutdown protection.
In addition, the logic instructions in the memory 830 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the transmission method provided in the foregoing embodiments when executed by a processor, and for example, the method includes: under the condition of receiving a shutdown instruction, judging whether the running frequency of a compressor to be subjected to shutdown reaches a preset protection frequency or not; and when the running frequency reaches a preset protection frequency, using a safety mode of overvoltage shutdown to perform shutdown protection.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of protecting against an overvoltage shutdown, comprising:
under the condition of receiving a shutdown instruction, judging whether the running frequency of a compressor to be subjected to shutdown reaches a preset protection frequency or not;
and when the running frequency reaches a preset protection frequency, using a safety mode of overvoltage shutdown to perform shutdown protection.
2. The method of claim 1, wherein said shutdown protection using a safe mode of overvoltage shutdown when said operated frequency reaches a preset protection frequency comprises:
when the running frequency reaches a preset protection frequency, reducing the voltage value of the direct current bus;
and executing safe shutdown operation under the condition that the voltage value of the direct current bus reaches a preset bus high-voltage safety value.
3. The method of claim 2, wherein reducing the voltage value of the dc bus when the operating frequency reaches a predetermined protection frequency comprises:
when the operating frequency reaches a preset protection frequency, calculating an overvoltage value according to the operating frequency;
and reducing the bus voltage from the overvoltage value to a preset bus high-voltage safety value.
4. The method of claim 3, wherein said reducing said bus voltage from said overvoltage value to a preset bus high voltage safety value comprises:
and stably reducing the bus voltage from the overvoltage value to a preset bus high-voltage safety value within the inherent safe voltage reduction duration of the compressor by adjusting the duty ratio of a PWM (pulse width modulation) driving signal of the digital PFC.
5. The method of claim 3, wherein performing a safe shutdown operation in the event the voltage value of the DC bus reaches a bus high voltage safety value comprises:
under the condition that the voltage value of the direct current bus reaches a bus high-voltage safety value, monitoring the voltage value of an electrolytic capacitor of the compressor in real time, and executing shutdown operation;
and when the voltage value of the electrolytic capacitor reaches the preset bus high-voltage safety value, executing active short-circuit control, so that the residual electric energy generated when the compressor is stopped is consumed in a motor winding.
6. The method as claimed in claim 5, wherein the performing of the active short circuit control when the voltage value of the electrolytic capacitor reaches the preset bus bar high voltage safety value so that the residual electric energy generated by the compressor at the shutdown is consumed at the motor winding comprises:
when the voltage value of the electrolytic capacitor reaches the preset bus high-voltage safety value, executing active short-circuit control;
and controlling the current in the motor winding through the duty ratio of the PWM driving signal so that the current does not exceed the demagnetization current preset by the compressor.
7. A protection device for overvoltage shutdown, comprising:
the judging module is used for judging whether the running frequency of the compressor to be stopped reaches a preset protection frequency or not under the condition of receiving the stop instruction;
and the protection module is used for performing shutdown protection by using an overvoltage shutdown safety mode when the running frequency reaches a preset protection frequency.
8. The protection device of claim 7, wherein: the judging module and the protecting module are controlled to execute the protecting method of any one of claims 1 to 6.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the protection method according to any one of claims 1 to 6 are implemented when the processor executes the program.
10. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the protection method according to any one of claims 1 to 6.
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| CN202011187307.9A CN112332374B (en) | 2020-10-29 | 2020-10-29 | Overvoltage shutdown protection method and device |
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| CN202011187307.9A CN112332374B (en) | 2020-10-29 | 2020-10-29 | Overvoltage shutdown protection method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113346731A (en) * | 2021-05-10 | 2021-09-03 | Tcl空调器(中山)有限公司 | Compressor shutdown circuit and method and air conditioner |
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| CN111271840A (en) * | 2020-03-09 | 2020-06-12 | 珠海格力电器股份有限公司 | Effective voltage abnormity protection method and device and air conditioning unit |
| CN112178885A (en) * | 2020-09-08 | 2021-01-05 | Tcl空调器(中山)有限公司 | Shutdown control method of compressor and air conditioning equipment |
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2020
- 2020-10-29 CN CN202011187307.9A patent/CN112332374B/en active Active
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| CN104110775A (en) * | 2013-09-13 | 2014-10-22 | 广东美的制冷设备有限公司 | Frequency-conversion air conditioner operation control method and device |
| WO2017186436A1 (en) * | 2016-04-27 | 2017-11-02 | Zf Friedrichshafen Ag | System for actively short-circuiting phases of an inverter and motor vehicle drive |
| CN111092590A (en) * | 2018-10-23 | 2020-05-01 | 上海汽车变速器有限公司 | Active discharging system and control method of motor controller |
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| CN113346731A (en) * | 2021-05-10 | 2021-09-03 | Tcl空调器(中山)有限公司 | Compressor shutdown circuit and method and air conditioner |
| CN113346731B (en) * | 2021-05-10 | 2023-01-20 | Tcl空调器(中山)有限公司 | Compressor shutdown circuit and method and air conditioner |
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Effective date of registration: 20230625 Address after: 400039 GREE Road, Kowloon District, Chongqing, No. 1 Patentee after: GREE ELECTRIC APPLIANCES (CHONGQING) Co.,Ltd. Patentee after: GREE ELECTRIC APPLIANCES,Inc.OF ZHUHAI Address before: 519070 golden hill west road, Qianshan, Xiangzhou District, Zhuhai, Guangdong Patentee before: GREE ELECTRIC APPLIANCES,Inc.OF ZHUHAI |
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