CN112671007A - Frequency conversion anti-disturbance intelligent regulation device - Google Patents
Frequency conversion anti-disturbance intelligent regulation device Download PDFInfo
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- CN112671007A CN112671007A CN202011583589.4A CN202011583589A CN112671007A CN 112671007 A CN112671007 A CN 112671007A CN 202011583589 A CN202011583589 A CN 202011583589A CN 112671007 A CN112671007 A CN 112671007A
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Abstract
A variable-frequency anti-disturbance intelligent adjusting device comprises a power module, an adjusting module and a data processing module. The power module comprises two direct current buses. The adjusting module comprises a rated value presetting module, a detecting module, a comparing module, a charging and discharging module and a switch module. The rated value presetting module is used for presetting the charging voltage value and the discharging voltage value on two direct current buses of the power supply module. The detection module is used for detecting voltage values on two direct current buses of the power supply module. The comparison module is used for comparing the voltage value with the charging voltage value and the discharging voltage value respectively. The charge-discharge module is used for charging or discharging. The switch module comprises a charging switch and a discharging switch. And the data processing module is used for controlling the working states of the charging switch and the discharging switch. The frequency conversion anti-disturbance intelligent adjusting device can protect the normal working state of the frequency conversion transmission system when the under-voltage fluctuation or the over-voltage fluctuation occurs.
Description
Technical Field
The invention relates to the field of circuit design, in particular to a variable-frequency anti-disturbance intelligent adjusting device.
Background
Large motor drives can cause grid voltage fluctuations at start-up, either in thunderstorm weather, or due to interference from other factors. The normal operation of the electrical device is directly affected by the grid voltage fluctuations. For a variable-frequency transmission system, fault protection such as undervoltage and overvoltage can occur, so that a production line is stopped, the production efficiency is reduced, and even the product quality is influenced. In order to prevent the variable frequency transmission system from having the fault protection, a DC-BANK solution is adopted in some places at present, the problem of the undervoltage of a primary loop of a part of the variable frequency transmission system can be solved, but the problem of the fault of a frequency converter caused by the undervoltage of a secondary loop cannot be solved, and meanwhile, the problem of slow system response exists in the solution. Meanwhile, the scheme can not solve the overvoltage fault of the variable frequency transmission system. When the DC-BANK solution is configured with the frequency converter in a one-to-many manner, a storage battery pack and a voltage conversion device are generally adopted, so that the energy loss is high, the charging and discharging of the storage battery have certain influence on the environment, and meanwhile, when the one-to-many configuration scheme is realized, the flexibility and the reliability are poor.
Disclosure of Invention
In view of the above, the present invention provides a novel variable-frequency disturbance-rejection intelligent regulating device to solve the above technical problems.
A variable-frequency disturbance-resistant intelligent adjusting device is electrically connected with a variable-frequency transmission system and comprises a power module, an adjusting module and a data processing module, wherein the adjusting module is electrically connected with the power module, and the data processing module is electrically connected with the adjusting module. The power module is used for providing power for the variable frequency transmission system and comprises two direct current buses. The adjusting module comprises a rated value presetting module, a detection module electrically connected with the power supply module, a comparison module electrically connected with the detection module, a charging and discharging module electrically connected with the power supply module, and a switch module used for controlling the charging and discharging module to be switched on and off. The rated value presetting module is used for presetting the charging voltage value and the discharging voltage value on two direct current buses of the power supply module. The detection module is used for detecting voltage values on two direct current buses of the power supply module. The comparison module is used for comparing the voltage value output by the detection module with the charging voltage value and the discharging voltage value respectively. The charging and discharging module is used for charging or discharging and comprises at least one capacitor. The switch module is electrically connected between the charge-discharge module and the power supply module and comprises a charge switch and a discharge switch. And the data processing module controls the working states of the charging switch and the discharging switch according to the output of the comparison module. When the voltage value output by the detection module is larger than the charging voltage value, the charging switch is turned on by the data processing module and is turned off to charge the charging and discharging module so as to discharge when the power grid is in short-circuit, so that the variable frequency transmission system works normally. And when the voltage value output by the detection module is greater than the discharge voltage value, the data processing module opens the discharge switch and closes the charge switch so as to reduce the instant voltage values on the two direct current buses of the power supply module. And when the voltage value output by the detection module is smaller than the discharge voltage value, the data processing module turns off the discharge switch and turns off the charge switch so as to enable the power supply module to normally output.
Furthermore, the detection module comprises a direct current voltage transmitter connected in parallel to the power module, and the direct current voltage transmitter is used for transmitting a direct current voltage isolation in a power grid into a linear direct current analog signal so as to obtain an instant voltage value of the power module.
Furthermore, the detection module also comprises a voltage stabilizer connected with the direct current voltage transmitter in series, and the voltage stabilizer is used for enabling the direct current voltage transmitter to be in a normal working state.
Furthermore, the variable-frequency anti-disturbance intelligent adjusting device also comprises an under-current compensation module which is connected in parallel with the two direct-current buses, the under-current compensation module comprises an inverter power supply which is connected in parallel with the power supply module and a switch power supply which is connected in series between the inverter power supply and a charge-discharge module, the inverter power supply is electrically connected with a power grid, and when the power grid is under-current, the charge-discharge module provides 220V alternating current for the variable-frequency transmission system through the inverter power supply so as to ensure the normal work of the variable-frequency transmission system.
Furthermore, the under-power compensation module also comprises a bypass switch connected with the inverter power supply in parallel, and one electric connection end of the bypass switch is positioned between the power grid and the inverter power supply.
Further, the charge and discharge module comprises four super capacitors connected in series.
Further, the charging switch is connected in series with the charging and discharging module and comprises a first insulated gate bipolar transistor and a second insulated gate bipolar transistor which are connected in series, an emitter of the first insulated gate bipolar transistor is electrically connected with the charging and discharging module, a collector of the first insulated gate bipolar transistor is electrically connected with an emitter of the second insulated gate bipolar transistor, and a collector of the second insulated gate bipolar transistor is electrically connected with the power supply module.
Further, the charging switch further comprises a protection resistor connected in parallel between the emitter and the collector of the first insulated gate bipolar transistor.
Further, the charging switch further comprises a protection capacitor connected in parallel between the emitter and the collector of the second insulated gate bipolar transistor.
Further, the discharge switch is connected in parallel with the charge and discharge module and comprises a third insulated gate bipolar transistor and a fourth insulated gate bipolar transistor which are connected in series, an emitter of the third insulated gate bipolar transistor is electrically connected with the charge and discharge module, a collector of the third insulated gate bipolar transistor is electrically connected with an emitter of the fourth insulated gate bipolar transistor, and a collector of the fourth insulated gate bipolar transistor is electrically connected with the power supply module.
Compared with the prior art, the frequency conversion anti-disturbance intelligent adjusting device provided by the invention is provided with the adjusting module, the adjusting module is provided with the detecting module, when the detecting module detects that the voltage of the direct current bus of the power supply module is greater than the charging voltage value, the data processing module automatically triggers the charging switch to be conducted so as to charge the charging and discharging module, and when the power grid generates under-voltage fluctuation, the charging and discharging module can provide electric energy in real time to maintain the voltage of the direct current bus of the frequency conversion transmission system, so that the normal work of the frequency conversion transmission system can be ensured. When the overvoltage fluctuation occurs to the power grid or the voltage of the direct current bus is increased when the motor is in a feedback state, and when the voltage of the direct current bus exceeds a discharge voltage value, the data processing module automatically triggers the discharge switch to conduct the discharge switch to discharge the direct current bus, so that the voltage increase of the direct current bus is inhibited, the overvoltage fault of the variable frequency transmission system is prevented, and when the voltage of the direct current bus is lower than the discharge voltage value, the data processing module automatically turns off the discharge switch. Therefore, the normal working state of the variable-frequency transmission system can be protected when under-voltage fluctuation or over-voltage fluctuation occurs, the production line is prevented from being stopped, the production efficiency is reduced, and even the product quality is influenced. Meanwhile, the frequency conversion anti-disturbance intelligent adjusting device directly adjusts the voltage of the direct current bus of the power module, so that a one-to-many configuration scheme can be realized flexibly and reliably.
Drawings
Fig. 1 is a schematic block diagram of a variable-frequency disturbance rejection intelligent regulating device provided by the invention.
Fig. 2 is a schematic diagram of a circuit function module of the variable frequency disturbance rejection intelligent regulating device of fig. 1.
Fig. 3 is a schematic circuit diagram of the variable frequency disturbance rejection intelligent regulating device of fig. 1.
Detailed Description
Specific examples of the present invention will be described in further detail below. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.
Fig. 1 to fig. 3 are schematic structural diagrams of the variable-frequency disturbance rejection intelligent regulating device provided by the present invention. The variable-frequency anti-disturbance intelligent adjusting device is electrically connected with a variable-frequency transmission system and is used for adjusting the voltage applied to the variable-frequency transmission system. The variable-frequency anti-disturbance intelligent adjusting device comprises a power module 10, an adjusting module 20 electrically connected with the power module 10, a data processing module 30 electrically connected with the adjusting module 20, and an under-current compensation module 40 connected with the power module 10 in series. It is conceivable that the variable-frequency disturbance-rejection intelligent adjusting apparatus further includes other functional modules, such as various auxiliary electronic components, such as various functional switches, etc., as well as electrical connection components, installation and assembly, etc., which are well known to those skilled in the art and will not be described herein again.
The power module 10 may be connected to and powered by a utility grid, and may include conventional functional modules, such as a transformer, a rectifier module, a three-terminal isolated power supply, etc., which are known in the art and will not be described in detail herein. The power module 10 includes two dc buses, i.e., a positive connection line 11 and a negative connection line 12.
The adjusting module 20 comprises a rating presetting module 21, a detecting module 22 electrically connected with the power module 10, a comparing module 23 electrically connected with the detecting module 22, a charging and discharging module 24 electrically connected with the power module 10, and a switch module 25 for controlling the charging and discharging module to be switched on and off. The nominal value presetting module 21 is used for setting a threshold value of an operating state for the whole system, and the threshold value is stored in a microprocessor (not shown) and called by the microprocessor for processing. In this embodiment, the microprocessor is a PLC. The rated value presetting module 21 is configured to preset a charging voltage value and a discharging voltage value on two dc buses of the power module 10. When the detected instant voltage value on the direct current bus is smaller than the charging voltage value, the power grid is in an undervoltage state, and when the instant voltage value is larger than the charging voltage value and smaller than the discharging voltage value, the power grid is in a normal state, and the instability of the power grid voltage is processed by other circuit modules such as a voltage stabilizer to provide stable voltage for the power utilization module. When the instantaneous voltage value is greater than the discharge voltage value, it indicates that the power grid is in an overvoltage state, and the voltage on the dc bus of the power module 10 needs to be shunted and discharged so as to return to a value between the charge voltage value and the discharge voltage value. In this embodiment, the charging voltage is 480V, and the discharging voltage is 650V. The detection module 22 is configured to detect voltage values on two dc buses of the power module 10, that is, instant voltage values on two dc buses of the power module 10. The detection module 22 includes a dc voltage transmitter 221 connected in parallel to the power module 10, and a voltage regulator 222 connected in parallel to the dc voltage transmitter 221. The dc voltage transmitter 221 is a prior art technology, and is used for transmitting dc voltage isolation in a power grid to a linear dc analog signal, so that an instant voltage value on two dc buses of the power module 10 can be obtained. Specifically, the dc voltage transmitter 221 is electrically connected to a microprocessor in the variable frequency disturbance rejection intelligent regulating device, so that the detected instant data can be transmitted to the microprocessor for processing. The voltage stabilizer 222 is used for providing a stable voltage to the dc voltage transmitter 221, so as to facilitate the stable operation thereof, and is a prior art, and will not be described herein. The comparison module 23 is a computer program, and it will be apparent to those skilled in the art that the computer program capable of implementing the present invention can be written in the existing computer language as long as the design idea of the present invention is understood, and will not be described in detail herein. The comparison module 23 is configured to compare the voltage value output by the detection module 21 with the charging voltage value and the discharging voltage value, respectively, and transmit the comparison value to the PLC for processing. The charge and discharge module 24 includes at least one capacitor, and in this embodiment, the charge and discharge module 24 includes four super capacitors connected in series or in parallel to two dc buses of the power module 10. The four super capacitors are charged or discharged to ensure that the voltages on the two dc buses of the power module 10 are maintained in a normal interval. The switch module 25 is electrically connected between the charge-discharge module 24 and the power module 10 and includes a charge switch 251 and a discharge switch 252. The charge switch 251 is connected in series with the charge and discharge module 24 and includes a first insulated gate bipolar transistor 2511 and a second insulated gate bipolar transistor 2512 connected in series. An emitter of the first insulated gate bipolar transistor 2511 is electrically connected with the charge and discharge module 24, and a collector of the first insulated gate bipolar transistor 2511 is electrically connected with an emitter of the second insulated gate bipolar transistor 2512. The collector of the second igbt 2512 is electrically connected to the power module 10, and the gates of the first and second igbts 2511 and 2512 are electrically connected to the data processing module 30, so that the first and second igbts 2511 and 2512 can be turned on or off under the control of the data processing module 30. In order to ensure that the first and second igbts 2511 and 2512 can work normally, the charging switch 251 further includes a protection resistor connected in parallel between the emitter and the collector of the first igbts 2511, and a protection capacitor connected in parallel between the emitter and the collector of the second igbts 2512. The discharge switch 252 is connected in parallel with the charge and discharge module 24 and includes a third igbt 2521 and a fourth igbt 2522 connected in series. An emitter of the third igbt 2521 is electrically connected to the charge/discharge module 24, a collector of the third igbt 2522 is electrically connected to an emitter of the fourth igbt 2522, and a collector of the fourth igbt 2522 is electrically connected to a power supply module.
The data processing module 30 may be any conventional electronic component having data storage and data processing functions, such as a central processing unit, a microprocessor, or a PLC. In this embodiment, the data processing module 30 is a PLC, which receives the output value from the comparing module 23 and controls the operating state of the switch module 25 according to the output value of the comparing module 23. When the voltage of the power grid fluctuates due to undervoltage, the voltages of the two dc buses of the power module 10 are lower than the charging voltage value, that is, lower than 480V, and at this time, the data processing module 30 will automatically and directly turn on the discharging switch 251, that is, turn on the first igbt 2511 and the second igbt 2512, so that the four supercapacitors discharge, provide power for the variable frequency transmission system, maintain the dc bus voltage of the frequency converter, and ensure the normal operation of the frequency converter. When the voltage on the power grid is normal, that is, the voltages on the two dc buses of the power module 10 are greater than the charging voltage value and less than the discharging voltage value, that is, greater than 480V and less than 650V, the charging and discharging module 24 performs charging. At this time, the first and second igbts 2511 and 2512 each have a diode, so that the charge/discharge module 24 can be charged. When the charging and discharging module 24 approaches the voltage value on the dc bus, it will enter a float state. When the voltage of the dc bus is increased due to overvoltage fluctuation of the power grid or when the motor is in a feedback state, and when the voltage value of the dc bus exceeds the discharge voltage value, i.e. is greater than 650V, the data processing module 30 will automatically trigger the discharge switch 252 and turn it on to discharge the dc bus, thereby suppressing the voltage increase of the dc bus and preventing the variable frequency transmission system from overvoltage failure. When the voltage value on the dc bus is lower than the discharging voltage, the data processing module 30 will automatically turn off the discharging switch 252. It should be understood that the data processing module 30 can also be used to program a computer to perform the above-mentioned operations, and the PLC is known in the art, and the programming method thereof should be known to those skilled in the art, that is, those skilled in the art can program a corresponding computer using the programming language in the art to perform the above-mentioned control operations as long as the idea of the present invention is understood.
When the power grid is under voltage, in order to prevent the power grid from still failing to recover to a normal state after the charge-discharge module 24 is discharged, the under-voltage compensation module 40 is configured to provide a compensation voltage to the power module 10 to ensure that the variable frequency transmission system can normally operate, for example, ensure that relays, contactors, and the like in a control loop are not released. The undervoltage compensation module 40 comprises an inverter power supply 41 connected in parallel between the power grid and the power supply module 40, a switching power supply 42 connected in parallel between the inverter power supply 41 and the charging and discharging module 24, and a bypass switch 43 connected in parallel with the inverter power supply 41. The inverter 43 is an electronic component in the prior art, and can convert direct current electric energy (batteries, storage batteries) into a converter with fixed frequency, fixed voltage or frequency and voltage regulation. The AC power supply provided by the inverter 41 can ensure that the variable frequency transmission system can work normally when the power grid is in short supply. The switching power supply 42 may be a stabilizer for ensuring the inverter 41 can work normally, which is a prior art and will not be described herein. The bypass switch 43 is an emergency switch, i.e. the bypass switch 43 can be opened to supply power when the inverter 41 is damaged or inconvenient to use.
Compared with the prior art, the frequency conversion anti-disturbance intelligent adjusting device provided by the invention is provided with the adjusting module 20, the adjusting module 20 is provided with the detecting module 21, when the detecting module 21 detects that the voltage of the direct current bus of the power supply module 10 is greater than the charging voltage value, the data processing module 30 automatically triggers the charging switch 251 to be conducted so as to charge the charging and discharging module 24, when the power grid generates under-voltage fluctuation, the charging and discharging module 24 can provide electric energy in real time to maintain the voltage of the direct current bus of the frequency conversion transmission system, and therefore the normal work of the frequency conversion transmission system can be ensured. When the overvoltage fluctuation occurs to the power grid, or when the voltage of the dc bus is increased due to the motor being in a feedback state, and when the voltage of the dc bus exceeds the discharge voltage value, the data processing module 30 will automatically trigger the discharge switch 252 to turn on, so as to discharge the dc bus, thereby suppressing the voltage increase of the dc bus, preventing the variable frequency transmission system from generating an overvoltage fault, and when the voltage of the dc bus is lower than the discharge voltage value, the data processing module 30 will automatically turn off the discharge switch. Therefore, the normal working state of the variable-frequency transmission system can be protected when under-voltage fluctuation or over-voltage fluctuation occurs, the production line is prevented from being stopped, the production efficiency is reduced, and even the product quality is influenced. Meanwhile, the frequency conversion anti-disturbance intelligent adjusting device directly adjusts the voltage of the direct current bus of the power module 10, so that a one-to-many configuration scheme can be realized flexibly and reliably.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.
Claims (10)
1. The utility model provides a frequency conversion anti-disturbance intelligent regulation device, its is connected with a frequency conversion transmission system electricity, its characterized in that: the frequency conversion disturbance-resistant intelligent adjusting device comprises a power supply module, an adjusting module and a data processing module, wherein the adjusting module is electrically connected with the power supply module, the power supply module is used for providing power for the frequency conversion transmission system and comprises two direct current buses, the adjusting module comprises a rated value presetting module, a detecting module, a comparing module, a charging and discharging module and a switch module, the detecting module is electrically connected with the power supply module, the comparing module is electrically connected with the detecting module, the charging and discharging module is electrically connected with the power supply module, the switch module is used for controlling the on-off of the charging and discharging module, the rated value presetting module is used for presetting the charging voltage value and the discharging voltage value on the two direct current buses of the power supply module, and the detecting module is used for detecting the voltage values on the two direct current buses of the power supply module, the comparison module is used for comparing the voltage value output by the detection module with the charging voltage value and the discharging voltage value respectively, the charging and discharging module is used for charging or discharging and comprises at least one capacitor, the switch module is electrically connected between the charging and discharging module and the power supply module and comprises a charging switch and a discharging switch, the data processing module controls the working states of the charging switch and the discharging switch according to the output of the comparison module, when the voltage value output by the detection module is larger than the charging voltage value, the charging switch is turned on by the data processing module to turn on the charging switch and turn off the discharging switch to charge the charging and discharging module so as to enable the variable-frequency transmission system to work normally when the power grid is in short-circuit, and when the voltage value output by the detection module is larger than the discharging voltage value, the data processing module turns on the discharging switch and turns off the charging switch And turning off the instant voltage values on two direct current buses of the power supply module, and turning off the discharge switch and turning on a charge switch by the data processing module when the voltage value output by the detection module is smaller than the discharge voltage value so that the power supply module outputs the voltage value normally.
2. The variable-frequency disturbance rejection intelligent regulation device of claim 1, wherein: the detection module comprises a direct-current voltage transmitter connected in parallel to the power supply module, and the direct-current voltage transmitter is used for transmitting a direct-current voltage in a power grid in an isolated mode to a linear direct-current analog signal so as to obtain an instant voltage value of the power supply module.
3. The variable-frequency disturbance rejection intelligent regulation device of claim 2, wherein: the detection module also comprises a voltage stabilizer connected with the direct-current voltage transmitter in series, and the voltage stabilizer is used for enabling the direct-current voltage transmitter to be in a normal working state.
4. The variable-frequency disturbance rejection intelligent regulation device of claim 1, wherein: the variable-frequency anti-disturbance intelligent adjusting device further comprises an under-current compensation module which is connected in parallel with the two direct-current buses, the under-current compensation module comprises an inverter power supply which is connected in parallel with the power supply module, and a switching power supply which is connected in series between the inverter power supply and a charge-discharge module, the inverter power supply is electrically connected with a power grid, and when the power grid is under-current, the charge-discharge module provides 220V alternating current to the variable-frequency transmission system through the inverter power supply so as to ensure that the variable-frequency transmission system works normally.
5. The variable-frequency disturbance rejection intelligent regulation device of claim 4, wherein: the under-power compensation module further comprises a bypass switch connected with the inverter power supply in parallel, and one electric connection end of the bypass switch is positioned between the power grid and the inverter power supply.
6. The variable-frequency disturbance rejection intelligent regulation device of claim 1, wherein: the charge and discharge module comprises a plurality of super capacitors connected in series or in parallel.
7. The variable-frequency disturbance rejection intelligent regulation device of claim 1, wherein: the charging switch is connected with the charging and discharging module in series and comprises a first insulated gate bipolar transistor and a second insulated gate bipolar transistor which are connected in series, an emitting electrode of the first insulated gate bipolar transistor is electrically connected with the charging and discharging module, a collecting electrode of the first insulated gate bipolar transistor is electrically connected with an emitting electrode of the second insulated gate bipolar transistor, and a collecting electrode of the second insulated gate bipolar transistor is electrically connected with the power supply module.
8. The variable-frequency disturbance rejection intelligent regulation device of claim 7, wherein: the charging switch also comprises a protective resistor connected in parallel between the emitter and the collector of the first insulated gate bipolar transistor.
9. The variable-frequency disturbance rejection intelligent regulation device of claim 7, wherein: the charging switch also comprises a protective capacitor connected in parallel between the emitter and the collector of the second insulated gate bipolar transistor.
10. The variable-frequency disturbance rejection intelligent regulation device of claim 8, wherein: the discharging switch is connected with the charging and discharging module in parallel and comprises a third insulated gate bipolar transistor and a fourth insulated gate bipolar transistor which are connected in series, an emitting electrode of the third insulated gate bipolar transistor is electrically connected with the charging and discharging module, a collecting electrode of the third insulated gate bipolar transistor is electrically connected with an emitting electrode of the fourth insulated gate bipolar transistor, and a collecting electrode of the fourth insulated gate bipolar transistor is electrically connected with the power supply module.
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| CN110854983A (en) * | 2019-11-29 | 2020-02-28 | 国家电网有限公司 | Voltage stabilizing device and method for stabilizing sudden change of direct current bus voltage based on super capacitor |
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Application publication date: 20210416 |