CN217769936U - Fan control system with frequency conversion redundancy function - Google Patents
Fan control system with frequency conversion redundancy function Download PDFInfo
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- CN217769936U CN217769936U CN202222022523.9U CN202222022523U CN217769936U CN 217769936 U CN217769936 U CN 217769936U CN 202222022523 U CN202222022523 U CN 202222022523U CN 217769936 U CN217769936 U CN 217769936U
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Abstract
The utility model discloses a fan control system with frequency conversion redundancy function, include: the power supply redundancy circuit is connected with a power bus A and a power bus B which are redundant mutually, and the frequency conversion redundancy circuit is connected with a fan No. 1 and a fan No. 2 respectively. The utility model discloses have the redundant function of frequency conversion drive, can be used to the seamless switching operation of two fans to guarantee that positive coal gas cooling air-blower system does not lead to shutting down because of the trouble and the unstability of single converter trouble or unilateral power. Meanwhile, the frequency conversion driving redundancy function can avoid the problems that the traditional fan control system with the power frequency bypass function has overlarge impact current and smaller output power factor when the power frequency is switched aside, so that the fan is electrically heated, shakes and is noisy, and pollutes a power grid, and the like, ensures high-reliability operation of the fan, improves the stability of the system, prolongs the service life of equipment, and ensures that production can be continuously carried out for a long time.
Description
Technical Field
The utility model relates to an electrical drive technical field. More specifically, the utility model relates to a fan control system with frequency conversion redundancy function.
Background
The frequency conversion technology comprises the application of frequency conversion technology and microelectronic technology, and the frequency converter is electrical equipment for controlling an alternating current motor in a mode of changing the frequency of a working power supply of the motor. The frequency converter has the advantages of remarkable energy saving and convenient control, is widely applied to transmission control occasions of general machinery such as fans, pumps and the like, and can be used for meeting the requirements of customers generally in occasions needing to realize load soft start or speed regulation.
At present, the common design scheme applied to the fan frequency converter in the metallurgical industry is as follows:
1) The single line diagram of the electrical principle of the common scheme 1 is shown in fig. 1. A frequency converter drives a fan, a power frequency bypass switch is connected to a main loop of the frequency converter in parallel, and the bypass switch is used for enabling a bypass of the frequency converter to exit from the main loop of the fan to operate and switching the fan to operate at power frequency. When the frequency converter has a fault or the frequency converter reports the fault due to the fluctuation of the power grid, the fan can be manually or automatically switched into a power frequency running state from the frequency conversion running state. Although this solution can ensure the fan to operate continuously for a long time, there are some problems. Such as: the fan is directly converted from frequency conversion operation to power frequency operation, and if the frequency and the power frequency have larger difference in the frequency conversion operation, certain response speed or process requirements on pressure regulation of a pipeline system are met after the fan is converted to the power frequency operation. For another example, the power frequency operation is the fixed frequency operation, the fan always operates at the maximum load, the rotating speed of the fan cannot be adjusted, and when the capacity changes, difficulty is increased for other process links, such as adjustment of a valve. And compared with the frequency conversion operation, the power frequency operation is not economical and energy-saving, and easily causes pollution and impact on a superior power grid, thereby influencing the normal operation of other equipment. And moreover, the running power supply of the frequency converter is not redundant, and when the power grid fails, the frequency converter and the fan stop running. This solution does not meet strict control requirements.
2) And a single line diagram of an electrical principle of the common scheme 2 is shown in fig. 2. Two sets of independent and same fan variable frequency driving systems are in a one-hot standby mode. When the running fan system fails and stops, the hot standby fan is started in time. The scheme solves the defects of non-energy-saving of the power frequency bypass, pollution to a power grid, non-adjustable speed of a fan and the like. There are still some problems, such as: the power supply of the frequency converter is not redundantly configured, and the frequency converter and the fan are stopped when the high-voltage bus is in power failure or the frequency converter breaks down or the frequency converter reports faults caused by power grid fluctuation. For another example: for the occasion with high requirement on the long-term continuous operation of the fans, for example, two fans must not have the condition that the simultaneous shutdown time exceeds a few seconds, otherwise, the production is influenced or accidents are caused, because when the running frequency converter fails, the fan is shut down, at the moment, another frequency converter must be started to drive another fan to run, and the requirement on the running frequency of the fans needs to be the same as that before the failure. Because the link involves the switching of the fans in the mode that the two sets of systems are used and prepared, and the running frequency of the fan is started from 0 rotating speed when the other fan is started, the recovery of the process usually takes longer time, and environmental protection or safety accidents are caused or production is influenced. This solution still does not meet the strict control requirements.
In summary, the conventional solutions have the following disadvantages:
(1) the fan control system resists the power grid fluctuation force measured by the power supply and has poor capability. Meanwhile, the power supply of the fan system is not in redundant configuration. These factors are likely to cause accidents and affect production.
(2) The frequency conversion control of the fan has no redundancy function, and once the running frequency converter fails, the fan stops running immediately. After the personnel carry out fault confirmation on the frequency converter, the frequency converter is restarted, or the standby fan is started, and the fan system is recovered to be normal. The failure recovery process takes long time, and will have great influence on safety, environmental protection and production.
Therefore, it is a problem to be solved by those skilled in the art to provide a solution to the above technical problems.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to solve at least the above problems and to provide at least the advantages which will be described later.
In order to realize these objects and other advantages, the utility model provides a fan control system with frequency conversion redundancy function, including the redundant circuit of power supply and the frequency conversion redundancy circuit of being connected with it, wherein, the redundant circuit of power supply is connected respectively with power bus A and power bus B each other is redundant, the frequency conversion redundancy circuit is connected respectively with No. 1 fan and No. 2 fans.
Preferably, the power supply redundant circuit comprises main power switch cabinets AQF1 and BQF2, frequency converter input switch cabinets AQF11 and AQF12, BQF21 and BQF22 and a dual-power PLC logic control cabinet;
the power supply bus A is connected with a main power switch cabinet AQF1 wire inlet end, and the main power switch cabinet AQF1 wire outlet end is respectively connected with the wire inlet ends of a frequency converter input switch cabinet AQF11 and an AQF 12;
the power bus B is connected with the inlet wire end of a main power switch cabinet BQF2, and the outlet wire end of the main power switch cabinet BQF2 is respectively connected with the inlet wire ends of the frequency converter input switch cabinets BQF21 and BQF 22;
the dual-power PLC logic control cabinet is used for controlling the switch cabinets AQF1, BQF2, AQF11, AQF12, BQF21 and BQF22 so as to realize the redundancy function of the power supply of the frequency converter.
Preferably, the frequency conversion redundancy circuit includes: no. 1 converter and No. 2 converter, no. 1 reactor and No. 2 reactor, converter output switch cabinet K1, K2, K3, K4 to and the redundant fan of frequency conversion switches PLC logic control cabinet.
The system comprises a 1-number frequency converter, a 1-number electric reactor, a 1-number frequency converter, a 1-number electric reactor and a frequency converter output switch cabinet, wherein the wire inlet end of the 1-number frequency converter is respectively connected with the wire outlet ends of an AQF11 and a BQF21 of the frequency converter input switch cabinet, the wire outlet end of the 1-number frequency converter is connected with the wire inlet end of the 1-number electric reactor, and the wire outlet end of the 1-number electric reactor is respectively connected with the wire inlet ends of K1 and K2 of the frequency converter output switch cabinet;
the inlet end of the No. 2 frequency converter is respectively connected with the outlet ends of an input switch cabinet AQF12 and a BQF22 of the frequency converter, the outlet end of the No. 2 frequency converter is connected with the inlet end of a No. 2 reactor, and the outlet end of the No. 2 reactor is respectively connected with the inlet ends of output switch cabinets K3 and K4 of the frequency converter;
the wire outlet ends of the frequency converter output switch cabinets K1 and K3 are connected with the No. 1 fan, and the wire outlet ends of the frequency converter output switch cabinets K2 and K4 are connected with the No. 2 fan;
the frequency conversion redundant fan switching PLC logic control cabinet is used for controlling a frequency converter No. 1, a frequency converter No. 2 and frequency converter output switch cabinets K1, K2, K3 and K4 so as to realize the frequency conversion redundant function of the fan and the fan switching operation function.
Preferably, PLC2-1 and PLC2-2 are arranged in the frequency conversion redundant fan switching PLC logic control cabinet to form CPU redundancy. The types of the PLC2-1 and the PLC2-2 are S7-1500R series redundancy modules.
Preferably, the dual-power PLC logic control cabinet is provided with a PLC1-1, and the model of the PLC1-1 is an S7-1200 series module.
Preferably, the frequency conversion redundant fan switching PLC logic control cabinet is also internally provided with a hot-pluggable I/O module, a communication module and a power module.
Preferably, the power supply redundancy configuration of the dual-power PLC logic control cabinet is used for meeting the requirement of normal power supply for a certain time after the power failure of the mains supply.
Preferably, the frequency conversion redundant fan switches power supply redundancy configuration of the PLC logic control cabinet to meet the requirement of normal power supply for a certain time after the commercial power is lost.
Preferably, the main power switch cabinets AQF1 and BQF2, the frequency converter input switch cabinets AQF11 and AQF12, BQF21 and BQF22, the frequency converter No. 1 and the frequency converter No. 2, and the control power supplies of the frequency converter output switch cabinets K1, K2, K3 and K4 are all configured redundantly so as to meet the requirement of normal power supply for a certain time after the power failure of the mains supply.
The utility model discloses at least, include following beneficial effect:
1. the normal operation of the frequency converter is not influenced by the power loss of the section of the bus;
2. the two frequency converters can control the same fan to operate, and the normal operation of the fan cannot be influenced by the fault of one frequency converter;
3. any one of the two frequency converters can independently control any one fan to operate, and the two frequency converters can respectively control the two fans to operate simultaneously. When one fan finishes the scheduled operation time and needs to be switched off for maintenance, the off-line fan gradually exits under the condition that the fan system does not shut down, the on-line fan gradually replaces the operation, and the switching operation of the two fans can be in seamless butt joint, so that the switching of the fans can be conveniently finished;
4. the high-voltage switch cabinet control power supply, the frequency converter control power supply and the PLC control cabinet power supply are all configured in a redundant manner;
5. and frequency conversion redundancy and CPU redundancy configuration of the fan switching system.
Objects and features of the present invention, as well as other advantages, will be apparent from the following description, and will be understood by those skilled in the art upon examination of the following or may be learned by practice of the present invention.
Drawings
FIG. 1 is an electrical single line schematic of a blower variable frequency control system of prior art solution 1;
FIG. 2 is an electrical single line schematic diagram of a blower variable frequency control system of prior art solution 2;
fig. 3 is an electrical single-line schematic diagram of a fan control system with frequency conversion redundancy function according to an embodiment of the present invention.
Fig. 4 is a man-machine interaction picture of the blower control system with frequency conversion redundancy function according to the embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description.
It is to be noted that the methods described in the following embodiments are, unless otherwise specified, conventional methods, and the devices and materials, unless otherwise specified, are commercially available; in the description of the present invention, the terms "AQF1", "BQF2", "AQF11", "AQF12", "BQF21", "BQF22", "1# converter", "2# converter", "1# reactor", "2# reactor", "K1", "K2", "K3", "K4", "PLC1-1", "PLC2-2", "1 main 2 spare 1# fan", "2 main 1 spare 2# fan", "1# variable frequency-1 # fan 2# variable frequency-2 # fan", "1# variable frequency-2 # fan", "2# variable frequency-1 # fan", etc. represent the components or the function buttons of the system control screen, which are based on the system components shown in the drawings, and are merely for convenience of description, and do not indicate or imply that the device or element referred to must have a specific noun, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.
As shown in fig. 3, the utility model provides a fan control system with redundant function of frequency conversion, include: the power supply redundancy circuit is connected with a power bus A and a power bus B which are redundant mutually, and the frequency conversion redundancy circuit is connected with a fan No. 1 and a fan No. 2 respectively.
Specifically, the power supply redundant circuit comprises main power switch cabinets AQF1 and BQF2, frequency converter input switch cabinets AQF11 and AQF12, BQF21 and BQF22 and a dual-power PLC logic control cabinet;
the power supply bus A is connected with a main power switch cabinet AQF1 wire inlet end, and the main power switch cabinet AQF1 wire outlet end is respectively connected with the wire inlet ends of a frequency converter input switch cabinet AQF11 and an AQF 12;
the power bus B is connected with the inlet wire end of a main power switch cabinet BQF2, and the outlet wire end of the main power switch cabinet BQF2 is respectively connected with the inlet wire ends of the frequency converter input switch cabinets BQF21 and BQF 22;
the dual-power PLC logic control cabinet is used for controlling a main power switch cabinet AQF1 and a BQF2, and the frequency converter is input into the switch cabinets AQF11 and AQF12, BQF21 and BQF22 so as to realize the redundancy function of the power supply of the frequency converter.
The dual-power PLC logic control cabinet is provided with a PLC1-1 and a touch screen, wherein the PLC1-1 can adopt an S7-1200 module, and the touch screen is used as a human-computer interface for switching the power supply of the frequency converter.
Specifically, the frequency conversion redundancy circuit includes: the system comprises a frequency converter 1, a frequency converter 2, a reactor 1, a reactor 2, frequency converter output switch cabinets K1, K2, K3 and K4 and a frequency conversion redundant fan switching PLC logic control cabinet;
the system comprises a 1-number frequency converter, a 1-number electric reactor, a 1-number frequency converter, a 1-number electric reactor and a frequency converter output switch cabinet, wherein the wire inlet end of the 1-number frequency converter is respectively connected with the wire outlet ends of an AQF11 and a BQF21 of the frequency converter input switch cabinet, the wire outlet end of the 1-number frequency converter is connected with the wire inlet end of the 1-number electric reactor, and the wire outlet end of the 1-number electric reactor is respectively connected with the wire inlet ends of K1 and K2 of the frequency converter output switch cabinet;
the inlet end of the No. 2 frequency converter is respectively connected with the outlet ends of an input switch cabinet AQF12 and a BQF22 of the frequency converter, the outlet end of the No. 2 frequency converter is connected with the inlet end of a No. 2 reactor, and the outlet end of the No. 2 reactor is respectively connected with the inlet ends of output switch cabinets K3 and K4 of the frequency converter;
the wire outlet ends of the frequency converter output switch cabinets K1 and K3 are connected with the No. 1 fan, and the wire outlet ends of the frequency converter output switch cabinets K2 and K4 are connected with the No. 2 fan;
the frequency conversion redundant fan switching PLC logic control cabinet is used for controlling a frequency converter No. 1, a frequency converter No. 2 and frequency converter output switch cabinets K1, K2, K3 and K4 so as to realize a fan frequency conversion redundant control function and a fan switching operation function.
The PLC logic control cabinet for switching the frequency conversion redundant fans is internally provided with a PLC2-1, a PLC2-2 and a touch screen, models of the PLC2-1 and the PLC2-2 can adopt an S7-1500R series redundancy module to form CPU redundancy, and the touch screen is used as a man-machine interface for switching the running frequency converter and the hot standby frequency converter and switching operation of the two fans. The frequency conversion redundant fan switching PLC logic control cabinet is also internally provided with a hot-pluggable I/O module, a communication module and a power module.
In the above embodiment:
the power bus A provides a 1 st power supply for the system;
the power bus B provides a 2 nd power supply for the system;
the power supply bus A and the power supply bus B can generally adopt 10 kilovolt buses to operate in a segmented mode, the power supply bus A and the power supply bus B are not connected, and two power supplies are mutually standby;
the main power switch cabinet AQF1 is used for protecting systems and equipment under a power bus A, and is switched off in time when the power side is in overvoltage, overcurrent and power failure, so that the systems and the equipment are electrically isolated from a power upper-level power grid, and the systems and the equipment hung under the bus are prevented from being damaged;
the main power supply switch cabinet BQF2 is used for protecting systems and equipment under a power supply bus B, and is timely opened when the power supply side is in overvoltage, overcurrent and power loss, so that the systems and the equipment are electrically isolated from a superior power grid of the power supply, and the systems and the equipment hung under the bus are prevented from being damaged;
the frequency converter input switch cabinet AQF11 is used for supplying power to the No. 1 frequency converter;
the frequency converter input switch cabinet AQF12 is used for supplying power to the No. 2 frequency converter;
the frequency converter input switch cabinet BQF21 is used for supplying power to the No. 1 frequency converter;
the frequency converter input switch cabinet BQF22 is used for supplying power to the No. 2 frequency converter;
the No. 1 frequency converter and the No. 2 frequency converter are used for carrying out soft start and speed regulation on the fan motor;
the No. 1 reactor and the No. 2 reactor are used for resisting the impact of grid connection;
the frequency converter output switch cabinets K1 and K3 are frequency converter output switches and are connected with the No. 1 fan armature;
the frequency converter output switch cabinets K2 and K4 are frequency converter output switches and are connected with No. 2 fan armatures;
the frequency converter input switch cabinets AQF11 and BQF21 are electrically interlocked and software interlocked, and the frequency converter input switch cabinets AQF12 and BQF22 are electrically interlocked and software interlocked, so that a loop formed by short circuit of the power bus A and the power bus B is avoided; the frequency converter output switch cabinets K1 and K2 are electrically interlocked and software interlocked, so that the condition that the No. 1 frequency converter is provided with two fans at the same time is avoided; the frequency converter output switches K3 and K4 are electrically interlocked and software interlocked, so that the situation that the No. 2 frequency converter is provided with two fans at the same time is avoided; the frequency converter output switches K1 and K3 are electrically interlocked and software interlocked, so that the condition that the No. 1 and No. 2 frequency converters are connected in parallel and operate with a draught fan is avoided; the frequency converter output switches K2 and K4 are electrically interlocked and software interlocked, so that the condition that the No. 1 and No. 2 frequency converters are connected in parallel and operate with a draught fan is avoided;
the dual-power PLC logic control cabinet is used for controlling power supply main incoming line switch cabinets AQF1 and BQF2 and frequency converter input switch cabinets AQF11, AQF12, BQF21 and BQF22. The dual-power PLC logic control cabinet controls the opening and closing actions of the switch cabinet through the opening and closing contacts of the opening and closing control circuit of the switch cabinet.
The control logic of the double-power PLC logic control cabinet is as follows: 1) The No. 1 frequency converter is powered by a power bus A through the AQF1 and the AQF11, and when the PLC detects that the power bus A is under voltage loss and current loss, the PLC sends a brake opening instruction to the AQF1, and then sends a switch closing instruction to the BQF21 to enable the BQF21 to be switched on. When the power bus A returns to normal, the original power supply mode is manually returned through the touch screen; 2) Similarly, the 2# frequency converter is powered by the power bus B through BQF2 and BQF22, when the PLC detects that the power bus B is under voltage loss and current loss, the PLC sends a brake opening instruction to the BQF2 to open the BQF2, and then sends a switch closing instruction to the AQF12 to close the AQF 12. When the power bus B returns to normal, the original power supply mode is manually returned through the touch screen. Under the condition that the low voltage ride through capability of the frequency converter meets the requirement that the voltage of a power grid falls in 5 cycles without influencing the operation, the switching of a power supply can be realized without influencing the normal operation of the frequency converter. Therefore, the power supply redundancy function of the frequency converter is realized.
The frequency conversion redundant fan switching PLC logic control cabinet controls the start, stop, alarm or fault reset of the No. 1 frequency converter and the No. 2 frequency converter in a communication mode, and adjusts the output frequency of the frequency converters. And meanwhile, the output current, the output voltage and the output frequency of the frequency converter are monitored in real time, and alarm and fault data are recorded and displayed on the touch screen. The PLC controls the start and stop of the frequency converter through the upper computer to realize the operation switching of the frequency converter. The frequency conversion redundant fan switching PLC logic control cabinet performs switching-on and switching-off control on K1, K2, K3 and K4 through hard wiring and a switching-on and switching-off loop of a switch cabinet, realizes selection of a frequency converter during operation of a fan, and is used for realizing a convenient fan switching operation function.
As shown in fig. 4, the control logic of the frequency conversion redundant fan switching PLC logic control cabinet is as follows:
A. and in the single-variable-frequency-band single-fan operation mode, the operation state of the fan is that two frequency converters control one fan to operate. The single-variable-frequency-band single-fan operation mode comprises the following 4 modes:
(1) the No. 1 frequency converter operates with the No. 1 fan, and the picture of the touch screen is called as '1 main fan 2 spare fan 1': at the moment, the frequency converter No. 1 operates, the frequency converter No. 2 is standby for hot standby, the K2, the K3 and the K4 are switched off, and the K1 is switched on. When the PLC detects that the No. 1 frequency converter has a fault or a selection button on a control cabinet is automatically turned to manual mode and clicks a one-key switching button after a mode button of a '2 main 1 standby 1# fan' is selected on a touch screen, the PLC sends a brake-off instruction to K1, the PLC sends a brake-off signal to K3 after receiving the brake-off feedback signal of K1, the PLC starts the No. 2 frequency converter after receiving the brake-off feedback signal of K3, the No. 2 frequency converter starts the fan at a speed following runaway, and the starting frequency starts from the running frequency of the current fan. Namely, the whole process is that when the 1# frequency converter fails in the mode of 1 master 2 spare 1# fan, the mode of 2 master 1 spare 1# fan is automatically switched.
(2) The No. 1 frequency converter operates with the No. 2 fan, and the picture of the touch screen is called as '1 main 2 standby 2# fan' for short: at the moment, the frequency converter No. 1 operates, the frequency converter No. 2 is standby for hot standby, the K1, the K3 and the K4 are switched off, and the K2 is switched on. When the PLC detects that the No. 1 frequency converter fails or a selection button on a control cabinet is automatically turned to manual mode and clicks a one-key switching button after a mode button of a 2-master-1-to-2 # fan is selected on a touch screen, the PLC sends a brake opening instruction to K2, the PLC sends a brake closing signal to K4 after receiving the brake opening feedback signal of K2, the PLC starts the No. 2 frequency converter after receiving the brake closing feedback signal of K4, the No. 2 frequency converter starts the fan in a speed following flying mode, and the starting frequency starts from the running frequency of the current fan. Namely, the whole process is that when the 1# frequency converter fails, the mode is automatically switched to the 2# fan mode when the 1# frequency converter is in a mode of '1 master 2 spare 2# fan'.
(3) The No. 2 frequency converter runs with the No. 1 fan, and is called as '2 main 1 spare No. 1 fan' for short on the picture of the touch screen: at the moment, the frequency converter 2 operates, the frequency converter 1 is standby for hot standby, the K1, the K2 and the K4 are switched off, and the K3 is switched on. When the PLC detects that the No. 2 frequency converter fails or a selection button on the control cabinet is automatically turned to manual mode and a mode button of a No. 1 main fan and a No. 2 standby fan is selected on the touch screen and then a button of one-key switching is clicked, the PLC cabinet sends an opening instruction to the K3, the PLC receives an opening feedback signal of the K3 and then sends a closing signal to the K1, the PLC receives a closing feedback signal of the K1 and then starts the No. 1 frequency converter, the No. 1 frequency converter performs speed following runaway starting on the fan, and the starting frequency starts from the running frequency of the current fan. Namely, the whole process is that when the 2# frequency converter fails in the mode of '2 main 1 spare 1# fan', the mode of '1 main 2 spare 1# fan' is automatically switched to.
(4) The No. 2 frequency converter operates with the No. 2 fan, and the picture of the touch screen is called as '2 main 1 spare 2# fan': at the moment, the frequency converter 2 operates, the frequency converter 1 is standby for hot standby, the K1, the K2 and the K3 are switched off, and the K4 is switched on. When the PLC detects that the No. 2 frequency converter has a fault or a selection button on a control cabinet is automatically turned to manual mode and clicks a one-key switching button after a mode button of a 1 main 2 standby 2# fan is selected on a touch screen, the PLC sends a brake-off instruction to K4, the PLC sends a brake-off signal to K2 after receiving a brake-off feedback signal of K4, the PLC starts the No. 1 frequency converter after receiving a brake-off feedback signal of K2, the No. 1 frequency converter starts the fan at a speed following runaway, and the starting frequency starts from the running frequency of the current fan. Namely, the whole process is that when the 2# frequency converter fails in the mode of 2 main 1 standby 2# fan, the mode of 1 main 2 standby 2# fan is automatically switched.
B. Double frequency conversion area double fan operational mode (this mode is also called fan and switches the operational mode for carry out the switching operation link of fan, the fan does not have frequency conversion redundancy function under this mode), includes:
(1) the No. 1 frequency converter runs with the No. 1 fan, the No. 2 frequency converter runs with the No. 2 fan, and the picture of the touch screen is called as '1 # frequency conversion-1 # fan 2# frequency conversion-2 # fan' for short: at the moment, K1 and K4 are switched on, K2 and K3 are switched off, and the frequency converter No. 1 and the frequency converter No. 2 are in running states;
(2) no. 1 converter takes No. 2 fan to operate, no. 2 converter takes No. 1 fan to operate, and "1# frequency conversion-2 # fan 2# frequency conversion-1 # fan" is shortened for short on the touch-screen picture: at the moment, K2 and K3 are switched on, K1 and K4 are switched off, and the frequency converter No. 1 and the frequency converter No. 2 are in running states.
The fan switching process: when the fan is in a single-frequency-band single-motor operation mode, the frequency of the fan to be off-line can be manually adjusted to gradually decrease to 0 Hz, and meanwhile, the operation frequency of the fan to be on-line can be manually adjusted to gradually increase to meet the operation frequency of the production requirement. And the double-frequency-band double-fan operation mode can be switched to the single-frequency-band single-fan operation mode or the single-frequency-band single-fan operation mode to the double-frequency-band double-fan operation mode by one key.
Further, in a more preferred embodiment, the power supply redundancy configuration of the dual-power supply PLC logic control cabinet is configured to satisfy a certain time of normal power supply after the commercial power is lost.
Further, in a more preferred embodiment, the frequency conversion redundant fan switches power supply redundancy configuration of the PLC logic control cabinet to satisfy a certain time of normal power supply after the commercial power is lost.
Further, in a more preferred embodiment, the main power switch cabinets AQF1 and BQF2, the control power supplies of the frequency converter input switch cabinets AQF11 and AQF12, BQF21 and BQF22, the frequency converter 1 and the frequency converter 2, and the frequency converter output switch cabinets K1, K2, K3 and K4 are in redundant configuration so as to meet the requirement of normal power supply for a certain time after the power failure of the mains supply.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, particular embodiments, but rather to those skilled in the art, having the benefit of the teachings of the present invention, which is capable of numerous modifications and alternative forms, and will be readily apparent to those skilled in the art, and it is not intended to limit the invention to the details shown and described without departing from the general concepts defined by the appended claims and their equivalents.
Claims (10)
1. The utility model provides a fan control system with redundant function of frequency conversion which characterized in that includes: the power supply redundancy circuit is connected with a power bus A and a power bus B which are redundant mutually, and the frequency conversion redundancy circuit is connected with a fan No. 1 and a fan No. 2 respectively.
2. The fan control system with frequency conversion redundancy function according to claim 1, wherein the power supply redundancy circuit comprises main power switch cabinets AQF1 and BQF2, frequency converter input switch cabinets AQF11 and AQF12, BQF21 and BQF22, and a dual power PLC logic control cabinet;
the power supply bus A is connected with a main power switch cabinet AQF1 wire inlet end, and the main power switch cabinet AQF1 wire outlet end is respectively connected with the wire inlet ends of a frequency converter input switch cabinet AQF11 and an AQF 12;
the power bus B is connected with the inlet wire end of a main power switch cabinet BQF2, and the outlet wire end of the main power switch cabinet BQF2 is respectively connected with the inlet wire ends of the frequency converter input switch cabinets BQF21 and BQF 22;
the dual-power PLC logic control cabinet is used for controlling a main power switch cabinet AQF1 and a BQF2, and the frequency converter is input into the switch cabinets AQF11 and AQF12, BQF21 and BQF22 so as to realize the redundancy function of the power supply of the frequency converter.
3. The fan control system with variable frequency redundancy of claim 2, wherein the variable frequency redundancy circuit comprises: the system comprises a frequency converter 1, a frequency converter 2, a reactor 1, a reactor 2, frequency converter output switch cabinets K1, K2, K3 and K4 and a frequency conversion redundant fan switching PLC logic control cabinet;
the system comprises a 1-number frequency converter, a 1-number electric reactor, a 1-number frequency converter, a 1-number electric reactor and a frequency converter output switch cabinet, wherein the wire inlet end of the 1-number frequency converter is respectively connected with the wire outlet ends of an AQF11 and a BQF21 of the frequency converter input switch cabinet, the wire outlet end of the 1-number frequency converter is connected with the wire inlet end of the 1-number electric reactor, and the wire outlet end of the 1-number electric reactor is respectively connected with the wire inlet ends of K1 and K2 of the frequency converter output switch cabinet;
the inlet end of the No. 2 frequency converter is respectively connected with the outlet ends of an input switch cabinet AQF12 and a BQF22 of the frequency converter, the outlet end of the No. 2 frequency converter is connected with the inlet end of a No. 2 reactor, and the outlet end of the No. 2 reactor is respectively connected with the inlet ends of output switch cabinets K3 and K4 of the frequency converter;
the wire outlet ends of the frequency converter output switch cabinets K1 and K3 are connected with the No. 1 fan, and the wire outlet ends of the frequency converter output switch cabinets K2 and K4 are connected with the No. 2 fan;
the frequency conversion redundant fan switching PLC logic control cabinet is used for controlling a frequency converter No. 1, a frequency converter No. 2 and frequency converter output switch cabinets K1, K2, K3 and K4 so as to realize a fan frequency conversion redundant function and a fan switching operation function.
4. The fan control system with frequency conversion redundancy function according to claim 3, wherein the frequency conversion redundancy fan switching PLC logic control cabinet is provided with PLC2-1 and PLC2-2 to form CPU redundancy function.
5. The fan control system with frequency conversion redundancy function according to claim 4, wherein the frequency conversion redundancy fan switching PLC logic control cabinet is further provided with a hot-pluggable I/O module, a communication module and a power supply module.
6. The fan control system with frequency conversion redundancy function of claim 5, wherein the power supply redundancy configuration of the dual-power PLC logic control cabinet is configured to meet the requirement of normal power supply for a certain time after the commercial power is lost.
7. The fan control system with frequency conversion redundancy function according to claim 5, wherein the frequency conversion redundancy fan switches power supply redundancy configuration of the PLC logic control cabinet to satisfy normal power supply for a certain time after commercial power is lost.
8. The fan control system with the frequency conversion redundancy function according to claim 5, wherein the main power switch cabinets AQF1 and BQF2, the frequency converter input switch cabinets AQF11 and AQF12, BQF21 and BQF22, the No. 1 frequency converter and the No. 2 frequency converter, and the frequency converter output switch cabinets K1, K2, K3 and K4 are redundantly configured to meet the requirement of normal power supply for a certain time after the power failure of the mains supply.
9. The fan control system with frequency conversion redundancy function according to claim 5, wherein the dual power PLC logic control cabinet is provided with PLC1-1, and the PLC1-1 is S7-1200 series module.
10. The fan control system with frequency conversion redundancy function of claim 5, wherein the PLC2-1 and the PLC2-2 are both of the type S7-1500R series redundancy module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222022523.9U CN217769936U (en) | 2022-08-03 | 2022-08-03 | Fan control system with frequency conversion redundancy function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222022523.9U CN217769936U (en) | 2022-08-03 | 2022-08-03 | Fan control system with frequency conversion redundancy function |
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| Publication Number | Publication Date |
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| CN217769936U true CN217769936U (en) | 2022-11-08 |
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