CN211606436U - Full-digital intelligent controller of high-voltage frequency conversion bypass device - Google Patents
Full-digital intelligent controller of high-voltage frequency conversion bypass device Download PDFInfo
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- CN211606436U CN211606436U CN202020163733.8U CN202020163733U CN211606436U CN 211606436 U CN211606436 U CN 211606436U CN 202020163733 U CN202020163733 U CN 202020163733U CN 211606436 U CN211606436 U CN 211606436U
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Abstract
The utility model discloses a full digital intelligent controller of high-voltage frequency conversion bypass device, the device is installed in the main loop of converter VSI, control loop includes PIC intelligent control ware, machine side control box and centralized control DCS system, PIC intelligent control ware includes power module, PIC singlechip and its minimum system module, inlet wire switch cabinet control module, power frequency loop auto-change over device control module, converter inlet wire auto-change over device control module, converter outlet wire auto-change over device control module, AD conversion module, DA conversion module, serial ports communication module; the utility model discloses a PIC singlechip is as high-pressure frequency conversion bypass device's main control chip, and control scheme is nimble, can realize multichannel switching value control, analog quantity control and serial ports communication, realizes the switching value control between high-pressure frequency conversion bypass device and inlet wire cubical switchboard, business turn over line auto-change over device, the bypass auto-change over device, exchanges with the analog quantity of machine side control box, with the data communication of converter and centralized control DCS system.
Description
Technical Field
The utility model relates to an electrical control technical field, specific high pressure frequency conversion bypass device's full-digital intelligent control ware that says so.
Background
The high-power high-voltage frequency converter is widely applied to various fans and pumps in the industries of petrochemical industry, electric power, metallurgy, urban construction and the like, and plays an important role in reducing consumption and energy, improving the process and the like, so that the reliability of the operation of the frequency converter is the most concerned problem for customers in all industries. When the frequency converter breaks down or needs maintenance, the motor in the frequency conversion running state is switched to the power frequency running state to ensure that the production equipment does not stop, and the frequency conversion automatic bypass device is the main function of the frequency conversion automatic bypass device, so that the frequency conversion automatic bypass device is more and more favored by customers. At present, analog control is mostly adopted in traditional automatic bypass devices, the control method has the defects of tedious control, low reliability and maintainability and the like, some documents propose that a PLC is adopted to control the frequency converter bypass device, the control method can solve the problems of the analog control, but the PLC with a data acquisition module and a communication module in the market is generally high in price, and the control flexibility is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high pressure frequency conversion bypass device's full digital intelligent control ware to solve the problem that exists among the above-mentioned background art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a full-digital intelligent controller of a high-voltage frequency conversion bypass device is installed in a main loop of a frequency converter VSI, the main loop of the frequency converter VSI is connected in a mode that a high-voltage bus is connected to an isolating switch QS1 and a vacuum contactor KM1 through a line incoming switch cabinet, the frequency converter VSI, the vacuum contactor KM2 and the isolating switch QS2 are sequentially connected in series, and finally a load motor is connected, and the line incoming switch cabinet is also connected with a power frequency bypass switch QF2 in series and then directly reaches the load motor; the control loop comprises a PIC intelligent controller, a machine side control box and a centralized control DCS system, wherein the PIC intelligent controller comprises a power supply module, a PIC single chip microcomputer and a minimum system module thereof, an incoming line switch cabinet control module, a power frequency loop switching device control module, a frequency converter incoming line switching device control module, a frequency converter outgoing line switching device control module, an AD conversion module, a DA conversion module and a serial port communication module; the PIC single chip microcomputer and the minimum system module thereof are key elements of the PIC intelligent controller, the minimum system module comprises a clock circuit and a reset downloading circuit, the PIC single chip microcomputer adopts a PIC16CR74 chip of American Microchip corporation (Microchip), the crystal oscillator circuit adopts an external crystal oscillator with the frequency of 11.0592MHz, and the reset circuit adopts an external reset button.
Preferably, the incoming line switch cabinet control module comprises a first relay, the first relay is connected with the PIC single-chip microcomputer, and the first relay is simultaneously connected with a circuit breaker QF1 in the incoming line switch cabinet; the switching value output signal sent by the PIC singlechip drives the switching value signal of DC5V to be the switching value signal of DC220V which can be directly received by a breaker QF1 and a protection device in the incoming line switch cabinet through a first relay; the model number of the first relay is G6A-274P-ST-US.
Preferably, the power frequency loop switching device control module comprises a first optical coupler and a second relay, the first optical coupler isolates the main loop and the PIC intelligent controller, the first optical coupler is connected with the power frequency bypass switch QF2, signal acquisition and logic control are carried out on the state of the power frequency bypass switch QF2, the second relay is connected with the PIC single chip microcomputer, and a switching value output signal sent by the PIC single chip microcomputer drives a switching value signal of the DC5V into a switching value signal of the DC220V which can be directly received by the power frequency bypass switch QF2 through the second relay; the model of the first optocoupler is TLP521, and the model of the second relay is G6A-274P-ST-US.
Preferably, the control module of the incoming line switching device of the frequency converter comprises a second optocoupler and a third relay which are connected with the PIC single-chip microcomputer, the PIC single-chip microcomputer isolates the vacuum contactor KM1 and the disconnecting switch QS1 through the second optocoupler, and the third relay logically controls the vacuum contactor KM 1; the model of the second optocoupler is TLP521, and the model of the third relay is G6A-274P-ST-US.
Preferably, the control module of the frequency converter outgoing line switching device comprises a third optocoupler and a fourth relay which are connected with the PIC single-chip microcomputer, the PIC single-chip microcomputer isolates the vacuum contactor KM2 and the disconnecting switch QS2 through the third optocoupler, and the vacuum contactor KM2 is logically controlled through the fourth relay; the model of the third optocoupler is TLP521, and the model of the fourth relay is G6A-274P-ST-US.
Preferably, the model of the AD conversion module is 12-bit serial multi-channel AD chip TLC 2543; the type of the DA conversion module is a 12-bit serial DAC chip AD 5320.
Preferably, the serial port communication module is in data communication with the frequency converter VSI and the centralized control DCS through RS 485.
The power supply module is used for converting DC220V voltage into 5V and 24V direct-current voltage required by the controller, the model of the module power supply is LH20-10D0524-03, and the module can output two direct-current voltages of 5V/2500mA and 24V/200 mA;
the incoming line switch cabinet control module is used for realizing the logic locking function between the PIC intelligent controller and the incoming line switch cabinet and the identification and switching function of the protection fixed value of the load motor in the power frequency and frequency conversion states. The power frequency loop switching device control module is used for realizing the collection and the logic control of the PIC intelligent controller on the state of the power frequency loop switching device, namely the power frequency bypass switch QF 2. The control module of the frequency converter outgoing line switching device is used for realizing the state acquisition and logic control of a PIC intelligent controller on a vacuum contactor KM2 in the frequency converter outgoing line switching device and the state information acquisition of an isolating switch QS2, and the specific implementation mode is similar to that of the incoming line switching device control module; the control module of the incoming line switching device of the frequency converter is used for realizing state acquisition and logic control of a PIC intelligent controller on a vacuum contactor KM1 in the incoming line switching device of the frequency converter and state information acquisition of an isolating switch QS1, wherein the state acquisition of the vacuum contactor KM1 and the isolating switch QS1 is isolated by using an optical coupler, and the logic control of the vacuum contactor KM1 is driven by using a relay.
Compared with the prior art, the utility model discloses an advantage beneficial effect lies in: the PIC singlechip is used as a main control chip of the high-voltage frequency conversion bypass device, the control scheme is more flexible, multi-path switching value control, analog value control and serial port communication can be realized, switching value control between the high-voltage frequency conversion bypass device and an incoming line switch cabinet, an incoming line and outgoing line switching device and a bypass switching device is completed, analog value exchange between the high-voltage frequency conversion bypass device and a machine side control box is completed, and data communication between the high-voltage frequency conversion bypass device and a frequency converter and a DCS is completed. The utility model discloses compare in traditional controller and have that the structure is small and exquisite, intelligent degree is high, good reliability, advantage such as price/performance ratio height.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a circuit diagram of the frequency conversion bypass device of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the all-digital intelligent controller of the high-voltage frequency conversion bypass device is installed in a main loop of a frequency converter VSI, and the main loop of the frequency converter VSI is connected in a manner that a high-voltage bus is connected to an isolating switch QS1 and a vacuum contactor KM1 through an incoming line switch cabinet, the frequency converter VSI, the vacuum contactor KM2 and the isolating switch QS2 are sequentially connected in series, and finally, a load motor is connected, and the incoming line switch cabinet is also connected with a power frequency bypass switch QF2 in series and then directly reaches the load motor; the control loop comprises a PIC intelligent controller, a machine side control box and a centralized control DCS system, wherein the PIC intelligent controller comprises a power supply module, a PIC single chip microcomputer and a minimum system module thereof, an incoming line switch cabinet control module, a power frequency loop switching device control module, a frequency converter incoming line switching device control module, a frequency converter outgoing line switching device control module, an AD conversion module, a DA conversion module and a serial port communication module; the PIC single chip microcomputer and the minimum system module thereof are key elements of the PIC intelligent controller, the minimum system module comprises a clock circuit and a reset downloading circuit, the PIC single chip microcomputer adopts a PIC16CR74 chip of American Microchip corporation (Microchip), the crystal oscillator circuit adopts an external crystal oscillator with the frequency of 11.0592MHz, and the reset circuit adopts an external reset button.
The incoming line switch cabinet control module comprises a first relay, the first relay is connected with the PIC single chip microcomputer, and the first relay is simultaneously connected with a circuit breaker QF1 in the incoming line switch cabinet; the switching value output signal sent by the PIC singlechip drives the switching value signal of DC5V to be the switching value signal of DC220V which can be directly received by a breaker QF1 and a protection device in the incoming line switch cabinet through a relay; the model number of the first relay is G6A-274P-ST-US.
The power frequency loop switching device control module comprises a first optical coupler and a second relay, the first optical coupler isolates a main loop and a PIC intelligent controller, the first optical coupler is connected with a power frequency bypass switch QF2, signal acquisition and logic control are carried out on the state of the power frequency bypass switch QF2, the second relay is connected with a PIC single chip microcomputer, and a switching value output signal sent by the PIC single chip microcomputer drives a switching value signal of DC5V into a switching value signal of DC220V which can be directly received by the power frequency bypass switch QF2 through the second relay; the model of the first optocoupler is TLP521, and the model of the second relay is G6A-274P-ST-US.
The control module of the incoming line switching device of the frequency converter comprises a second optocoupler and a third relay which are connected with a PIC singlechip, the PIC singlechip isolates the vacuum contactor KM1 and an isolating switch QS1 through the second optocoupler, and the third relay logically controls the vacuum contactor KM 1; the model of the second optocoupler is TLP521, and the model of the third relay is G6A-274P-ST-US.
The control module of the frequency converter outgoing line switching device comprises a third optocoupler and a fourth relay which are connected with a PIC singlechip, the PIC singlechip isolates a vacuum contactor KM2 and an isolating switch QS2 through the third optocoupler, and the vacuum contactor KM2 is logically controlled through the fourth relay; the model of the third optocoupler is TLP521, and the model of the fourth relay is G6A-274P-ST-US.
The model of the AD conversion module is 12-bit serial multi-channel AD chip TLC 2543; the type of the DA conversion module is a 12-bit serial DAC chip AD 5320.
And the serial port communication module is in data communication with the frequency converter VSI and the centralized control DCS through RS 485.
The utility model discloses a PIC singlechip is as high-pressure frequency conversion bypass device's main control chip, and its control scheme is more nimble, can realize multichannel switching value control, analog quantity control and serial ports communication, accomplishes switching value control between high-pressure frequency conversion bypass device and inlet wire cubical switchboard, business turn over line auto-change over device, the bypass auto-change over device, accomplishes the analog quantity exchange of high-pressure frequency conversion bypass device and the other control box of machine, accomplishes the data communication of high-pressure frequency conversion bypass device and converter and DCS. The utility model discloses compare in traditional controller and have that the structure is small and exquisite, intelligent degree is high, good reliability, advantage such as price/performance ratio height.
Claims (7)
1. A full-digital intelligent controller of a high-voltage frequency conversion bypass device is installed in a main loop of a frequency converter VSI, the main loop of the frequency converter VSI is connected in a mode that a high-voltage bus is connected to an isolating switch QS1 and a vacuum contactor KM1 through a line incoming switch cabinet, the frequency converter VSI, the vacuum contactor KM2 and the isolating switch QS2 are sequentially connected in series, and finally a load motor is connected, and the line incoming switch cabinet is also connected with a power frequency bypass switch QF2 in series and then directly reaches the load motor; control circuit includes PIC intelligent control ware, machine side control box and centralized control DCS system, its characterized in that: the PIC intelligent controller comprises a power supply module, a PIC single chip microcomputer and a minimum system module thereof, an incoming line switch cabinet control module, a power frequency loop switching device control module, a frequency converter incoming line switching device control module, a frequency converter outgoing line switching device control module, an AD conversion module, a DA conversion module and a serial port communication module; the PIC single chip microcomputer and the minimum system module thereof are key elements of the PIC intelligent controller, the minimum system module comprises a clock circuit and a reset downloading circuit, the PIC single chip microcomputer adopts a PIC16CR74 chip of American micro-core company, the crystal oscillator circuit adopts an external crystal oscillator with the frequency of 11.0592MHz, and the reset circuit adopts an external reset button.
2. The fully digital intelligent controller of the high-voltage frequency conversion bypass device according to claim 1, characterized in that: the incoming line switch cabinet control module comprises a first relay, the first relay is connected with the PIC single chip microcomputer, and the first relay is simultaneously connected with a circuit breaker QF1 in the incoming line switch cabinet; the switching value output signal sent by the PIC singlechip drives the switching value signal of DC5V to be the switching value signal of DC220V which can be directly received by a breaker QF1 and a protection device in the incoming line switch cabinet through a relay; the model number of the first relay is G6A-274P-ST-US.
3. The fully digital intelligent controller of the high-voltage frequency conversion bypass device according to claim 1 or 2, characterized in that: the power frequency loop switching device control module comprises a first optical coupler and a second relay, the first optical coupler isolates a main loop and a PIC intelligent controller, the first optical coupler is connected with a power frequency bypass switch QF2, signal acquisition and logic control are carried out on the state of the power frequency bypass switch QF2, the second relay is connected with a PIC single chip microcomputer, and a switching value output signal sent by the PIC single chip microcomputer drives a switching value signal of DC5V into a switching value signal of DC220V which can be directly received by the power frequency bypass switch QF2 through the second relay; the model of the first optocoupler is TLP521, and the model of the second relay is G6A-274P-ST-US.
4. The fully digital intelligent controller of the high-voltage frequency conversion bypass device according to claim 3, characterized in that: the control module of the incoming line switching device of the frequency converter comprises a second optocoupler and a third relay which are connected with a PIC singlechip, the PIC singlechip isolates the vacuum contactor KM1 and an isolating switch QS1 through the second optocoupler, and the third relay logically controls the vacuum contactor KM 1; the model of the second optocoupler is TLP521, and the model of the third relay is G6A-274P-ST-US.
5. The fully digital intelligent controller of the high-voltage frequency conversion bypass device according to claim 4, characterized in that: the control module of the frequency converter outgoing line switching device comprises a third optocoupler and a fourth relay which are connected with a PIC singlechip, the PIC singlechip isolates a vacuum contactor KM2 and an isolating switch QS2 through the third optocoupler, and the vacuum contactor KM2 is logically controlled through the fourth relay; the model of the third optocoupler is TLP521, and the model of the fourth relay is G6A-274P-ST-US.
6. The fully digital intelligent controller of the high-voltage frequency conversion bypass device according to claim 5, characterized in that: the model of the AD conversion module is 12-bit serial multi-channel AD chip TLC 2543; the type of the DA conversion module is a 12-bit serial DAC chip AD 5320.
7. The fully digital intelligent controller of the high-voltage frequency conversion bypass device according to claim 6, characterized in that: and the serial port communication module is in data communication with the VSI and the centralized control DCS through RS 485.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112615571A (en) * | 2020-12-08 | 2021-04-06 | 西安热工研究院有限公司 | Frequency conversion and power frequency switching control method for induced draft fan of garbage power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112615571A (en) * | 2020-12-08 | 2021-04-06 | 西安热工研究院有限公司 | Frequency conversion and power frequency switching control method for induced draft fan of garbage power plant |
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