CN214591238U - Main-standby double-frequency-converter dragging system in petrochemical production - Google Patents
Main-standby double-frequency-converter dragging system in petrochemical production Download PDFInfo
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- CN214591238U CN214591238U CN202120830274.9U CN202120830274U CN214591238U CN 214591238 U CN214591238 U CN 214591238U CN 202120830274 U CN202120830274 U CN 202120830274U CN 214591238 U CN214591238 U CN 214591238U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
Main and standby double-frequency-converter dragging system in petrochemical production comprises an incoming line power supply, wherein a liquid resistor RS and a short circuit breaker QF2 which are connected in parallel are arranged at the rear end of the incoming line power supply, a frequency converter A, a frequency converter B and a power frequency breaker QF6 which are connected in parallel are arranged at the output end of the liquid resistor RS and the short circuit breaker QF2 which are connected in parallel, the parallel output ends of the three are connected with a variable frequency motor MD, and the variable frequency operation and the power frequency operation of the variable frequency motor MD are realized through the conversion of the breaker. Through the control that uses two converters, can use reserve converter to control when a converter breaks down or maintains, and can link up in order in advance to can turn into power frequency control automatically, communication each other between two converters reaches optimal operating mode efficiency through the sharing of state parameter.
Description
Technical Field
The utility model relates to a petrochemical industry production facility control field, especially a two frequency converter drive system of activestandby in petrochemical industry production.
Background
In petrochemical industry production line such as ethylene glycol production, large-scale draught fan often uses, according to the difference of production operating mode, needs control draught fan at different rotational speed and moment, consequently generally adopts the converter to control the draught fan, when the converter breaks down or needs to maintain, sets up the switching of frequency conversion to the power frequency. Because the power of the induced draft fan is large, the induced draft fan is limited by the total reduced capacity when being started, and the frequency conversion to power frequency switching is easy to trip by the pressure protection action of a hearth in the process of realizing reduced voltage switching, thereby seriously influencing the production continuity.
Disclosure of Invention
The utility model aims to solve the technical problem that a dual frequency converter of activestandby drags system in petrochemical industry production is provided, through the redundant control of the dual frequency converter of activestandby, has ensured the continuity of petrochemical industry production.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
main and standby double-frequency-converter dragging system in petrochemical production comprises an incoming line power supply, wherein a liquid resistor RS and a short circuit breaker QF2 which are connected in parallel are arranged at the rear end of the incoming line power supply, a frequency converter A, a frequency converter B and a power frequency breaker QF6 which are connected in parallel are arranged at the output end of the liquid resistor RS and the short circuit breaker QF2 which are connected in parallel, the parallel output ends of the three are connected with a variable frequency motor MD, and the variable frequency operation or the power frequency operation of the variable frequency motor MD is realized through the conversion of the breaker.
A control box and a frequency converter control PLC are arranged in the frequency converter A and the frequency converter B, and the two control boxes are connected through double-optical-fiber communication.
The frequency converter A and the frequency converter B are connected with the main control cabinet L1, the frequency converter A and the frequency converter B receive DCS instructions in the main control cabinet L1 and send feedback signals to the DCS, the frequency converter A and the frequency converter B are located in the centralized control cabinet L2, and the frequency converter control PLC is in communication connection with a human-machine interface HMI in the centralized control cabinet L2.
The input and output ends of the PLC in the main control cabinet L1 are connected with the switch ends and the control ends of the step-down incoming breaker QF1, the short circuit breaker QF2, the step-down outgoing breaker QF3, the frequency converter A incoming breaker QF4, the frequency converter A outgoing breaker QF5 and the power frequency breaker QF6, and the input and output ends of the frequency converter control PLC are connected with the switch ends and the control ends of the frequency converter B incoming breaker QF7 and the frequency converter B outgoing breaker QF 8.
The utility model provides a two frequency converter drive system of activestandby in petrochemical industry production, through the control that uses two frequency converters, can use reserve converter to control when a converter breaks down or maintains, and can link up in order in advance to can turn into power frequency control automatically, communication of each other between two converters reaches the optimal operating mode efficiency through state parameter's sharing.
Drawings
The invention will be further explained with reference to the following figures and examples:
fig. 1 is a schematic view of a primary connection structure of a main circuit of the present invention;
FIG. 2 is a schematic view of the communication connection between the frequency converters;
FIG. 3 is a schematic diagram of the connection of the switch and control signals of the main control cabinet and the centralized control cabinet;
fig. 4 shows a frequency converter and a main control cabinet. The connection schematic diagram of the centralized control cabinet.
In the figure: the system comprises a frequency converter A, a frequency converter B, a liquid resistor RS, a step-down inlet circuit breaker QF1, a short circuit breaker QF2, a step-down outlet circuit breaker QF3, a frequency converter A inlet circuit breaker QF4, a frequency converter A outlet circuit breaker QF5, a power frequency circuit breaker QF6, a frequency converter B inlet circuit breaker QF7, a frequency converter B outlet circuit breaker QF8, a variable frequency motor MD, a master control cabinet L1, a centralized control cabinet L2 and a human-computer interface HMI.
Detailed Description
As shown in fig. 1-4, the active-standby dual-frequency-converter dragging system in petrochemical production comprises an incoming line power supply, a liquid resistor RS and a short circuit breaker QF2 which are connected in parallel are arranged at the rear end of the incoming line power supply, a frequency converter a, a frequency converter B and a power frequency breaker QF6 which are connected in parallel are arranged at the output end of the liquid resistor RS and the short circuit breaker QF2 which are connected in parallel, the parallel output ends of the three are connected with a variable frequency motor MD, and the variable frequency operation or the power frequency operation of the variable frequency motor MD is realized through the conversion of the breaker.
A control box and a frequency converter control PLC are arranged in the frequency converter A and the frequency converter B, and the two control boxes are connected through double-optical-fiber communication.
The frequency converter A and the frequency converter B are connected with the main control cabinet L1, the frequency converter A and the frequency converter B receive DCS instructions in the main control cabinet L1 and send feedback signals to the DCS, the frequency converter A and the frequency converter B are located in the centralized control cabinet L2, and the frequency converter control PLC is in communication connection with a human-machine interface HMI in the centralized control cabinet L2.
The input and output ends of the PLC in the main control cabinet L1 are connected with the switch ends and the control ends of the step-down incoming breaker QF1, the short circuit breaker QF2, the step-down outgoing breaker QF3, the frequency converter A incoming breaker QF4, the frequency converter A outgoing breaker QF5 and the power frequency breaker QF6, and the input and output ends of the frequency converter control PLC are connected with the switch ends and the control ends of the frequency converter B incoming breaker QF7 and the frequency converter B outgoing breaker QF 8.
As shown in fig. 1, the frequency converter control scheme is divided into three parts, i.e., starting, frequency conversion, and power frequency operation:
firstly, pressure reduction starting:
after the step-down inlet breaker QF1 and the step-down outlet breaker QF3 are started, the liquid resistance cabinet pole plate moves, and the step-down starts to operate. And controlling according to the required voltage reduction requirement, closing the short circuit breaker QF2 when the pole plate is in place or the set control time is up, operating at full voltage, and then returning the pole plate.
Secondly, frequency conversion operation: the premise is that the power frequency circuit breaker QF6 is in an off state.
The operation of the frequency converter A is completed when the frequency converter A is switched on and switched off at two sides of the frequency converter A, the frequency converter A enters a breaker QF4, the frequency converter A exits a breaker QF5 and the inrush current magnetizing switch is switched on.
And the switch-on of the frequency converter B at the two sides of the frequency converter B is performed by the switching-in of the frequency converter B into the breaker QF7, the switching-out of the frequency converter B from the breaker QF8 and the switching-on of the inrush current magnetizing switch, namely the operation of the frequency converter B.
Operating at power frequency:
when the frequency conversion input and output switches of the double frequency converter are both switched off, the power frequency circuit breaker QF6 is switched on to operate.
As shown in fig. 2, the frequency converter which is received by the master PLC cabinet and started first is the master supply, and the operation data is transmitted to the standby frequency converter through the dual optical fibers between the master boxes in the two frequency converters in real time.
After the switching instruction is sent out, the standby frequency converter triggers redundant operation according to real-time data before main power supply switching.
As shown in fig. 3, the master PLC cabinet program logic intelligent execution scheme takes the frequency converter a as an example, and the frequency converter B controls the following processes:
1. the frequency converter A operates:
firstly, a command of a DCS (distributed control system) up-start frequency converter A is → a main control cabinet L1 is executed → a switch-on state of a circuit breaker QF4 of the frequency converter A is → a switch-on state of a step-down output circuit breaker QF3 is → a switch-on state of a step-down input circuit breaker QF1 is → a soft start pole plate moving state (time 1s) → → a switch-on state of an internal control excitation inrush current suppression cabinet of the frequency converter A is → a switch-on state of a short circuit breaker QF2 (post soft start return exit) → → a self-inspection standby state of the frequency converter A is → a switch-on state of a circuit breaker QF5 of the frequency converter A.
Executing the main control cabinet L1, and sending a starting instruction of the frequency converter A → starting of the frequency converter A in a delayed time.
And thirdly, giving a 4-20mA regulating signal by the DCS, and respectively giving two paths of outputs to the main control cabinet L1 and then respectively to the input end of the frequency converter A/B) → → always giving an instruction to control the operation of the frequency converter A.
And fourthly, feeding back the frequency converter A to DCS quantity display.
2. The operation of the frequency converter A \ B is set as the default host form:
the main control cabinet L1 is set on a program, firstly, a frequency converter A is started on the DCS, the frequency converter A is a main machine, and a frequency converter B is a standby machine after the frequency converter B is started on the DCS, and the program control details are shown in Table 1.
After the frequency converter A works normally, the DCS starts the frequency converter B to operate:
a switching-on command of a switch of a frequency converter B started by DCS → a main control cabinet L1 and a centralized control cabinet L2 are executed → a breaker QF7 of the frequency converter B enters a circuit breaker QF → 26 of the frequency converter B is closed → a switch of an excitation inrush current suppression cabinet controlled inside the frequency converter B is closed → a self-checking standby state of the frequency converter B is → a switch of a breaker QF8 of the frequency converter B is closed → a signal of a standby machine is sent.
TABLE 1 variable frequency A \ B Single Start operation settings Programming Specification
3. The A \ B frequency conversion master control box is in communication operation:
the frequency converter A is in operation, the frequency converter B is standby and standby, the main control boxes (IGBT tube control systems) in the two frequency converters adopt optical fiber real-time communication schemes which are mutually standby full-intelligent redundancy control, the communication speed can reach 10M at most, and the time of transmitted key parameters can be finished within millisecond level. When one path of the double-path optical fiber fails, the standby optical fiber is switched to continue communication, and a fault alarm signal is sent out through the PLC of the frequency converter.
The main control box of the control power module in the frequency converter A/B has certain information storage capacity, and control operation data of the frequency converter A can be copied to the control box of the frequency converter B in real time for storage. The method mainly comprises the following steps: the amplitude and angle of the reference voltage, the operating frequency, the output voltage, the current and other important electrical parameters.
Once the frequency converter B receives the signal of the artificial DCS upper instruction of switching A to B (note that when the frequency conversion A has a heavy fault, the main control cabinet L1 can quickly judge and send out the instructions of jumping QF4 and QF5, the frequency converter A is suddenly stopped, and the DCS sends out the artificial mutual switching and non-stop two-side switch).
Then, a 'frequency converter B starting' command is rapidly sent, the DSP non-speed sensing vector control technology is fully utilized, the frequency converter B starts speed regulation operation in an overhead running mode according to read data, the switching time is completed within a millisecond level, and compared with a fan with the inertia mass, the stable operation of the boiler cannot be influenced; for the medium-voltage frequency converter with the voltage source type, the frequency before the shutdown of the frequency converter A can be directly output within the rated frequency range, and the frequency converter B drags the motor to operate, so that the load is transferred from the frequency converter A to the frequency converter B, the master control PLC cabinet program intelligently sends out a master/standby machine signal, and the stable operation of equipment is ensured.
Under normal conditions, the duty drag load operation between two frequency converters can be carried out, planned overhaul and maintenance are realized, simple, reliable, intelligent and undisturbed switching is realized, and the operation requirement is completely met.
Table 2 sets the programming description for A \ B frequency conversion artificial or heavy fault mutual switching.
TABLE 2A \ B variable frequency man-made or heavy fault inter-cut setting programming description
4. "frequency conversion is cut to" frequency conversion "or" frequency conversion is cut to power frequency "operation
The control scheme has the functions of frequency conversion and power frequency conversion and frequency conversion at power frequency, and the detailed program control is shown in table 3.
Under normal conditions, after a command of 'frequency conversion power frequency switching' is sent out on the DCS, the main control cabinet L1 quickly sends out all the circuit breakers of the inlet and the outlet of the frequency converter A/B, and the frequency converter is stopped.
Simultaneously, a power frequency voltage reduction and automatic full voltage switching operation mode is triggered and started: the DCS emits a 'variable-frequency power switching' → → a main control cabinet L1 executes → → a frequency converter two-side switch QF4\ QF5\ QF7\ QF8 → → a power frequency breaker QF6 combined → → a step-down output breaker QF3 combined → → a step-down input breaker QF1 combined → → a soft start pole plate moving downward in place → → a short circuit breaker QF2 combined (soft start returns to exit) → → power frequency operation.
5. A/B mutual cutting of frequency converter
When one A/B of the frequency converter operates normally and the other one is in normal hot standby, the A/B of the DCS can be manually switched, and the switches on the two sides do not need to be powered off.
If the frequency converter A is running and the B has a fault or the condition is not met, the program automatically judges that the 'A is switched to the B' to be invalid and is not switched, if the B is ready, switches on two sides of the frequency converter B are immediately switched off in the process of switching to start the B if the fault is reported to be not started. The operation of the switch A is carried out again in priority, a total delay is set in the program, if the A is not operated, and the total delay is reached, the frequency conversion and the power frequency switching are automatically carried out.
TABLE 3 Programming description of mutual switching between frequency conversion A \ B and power frequency
5. FIG. 4 shows the control relationship between the PLC in the A/B of the frequency converter and the Schneider PLC communication of the centralized control cabinet, and the DCS and the main control PLC cabinet.
In the figure, the PLC in the frequency converter A/B communicates with the Schneider PLC in the centralized control cabinet in real time, and a background industrial personal computer is used for monitoring.
The main control box of the A/B power module of the frequency converter runs all data such as running current, voltage, power, frequency, fault information and the like, and the PLC controlled by the main control box is communicated with the PLC of the centralized control cabinet, and the industrial personal computer is used for real-time communication to acquire, transmit, process, store, call and other frequency converter running signals. The method is characterized in that the operation data and the switch states of the main and standby frequency converters are inquired on the background in real time, the remote measurement, the fault information and the like of the switches are quickly and accurately judged, the artificial intelligence inquiry is achieved, and the monitoring program is uploaded or downloaded in real time. The method has the super-large functions of high transmission rate, strong picture intuition and high readability.
The characteristics of ultra-large storage capacity and ultra-strong processing capacity of the industrial personal computer are fully utilized, and various stored data are effectively analyzed and compared for real-time calling.
The high reliability of the control of the centralized control system is fully ensured. When a frequency converter operates, the frequency converter is free from various interferences such as magnetic field radiation interference during frequency conversion output, dead halt and delay control. And secondly, the moisture resistance, dust prevention, corrosion prevention, condensation prevention, vibration prevention and lightning protection (additionally provided with lightning protection facilities) of various electronic printing plates must be ensured. And the third centralized control cabinet adopts uninterrupted AC of UPS and undisturbed redundant power supply of double power supplies such as 220V DC.
6. The power grid voltage loss protection function:
the frequency converter collects data conversion at the phase-shifting transformer end, has self-checking high-voltage electricity existence or nonelectric electricity, and when electricity existence or nonelectric electricity is detected, outputs passive closed contacts, is connected with a PLC in the frequency converter in a closed state with the incoming line switch cabinet, and outputs network voltage loss information by a program, and the high-voltage switch is directly blocked, sends a shutdown command and stops corresponding high-voltage switches.
The double frequency converter adopts a 'one-main-supply one-hot-standby' undisturbed switching scheme, can be designed into a plurality of working modes such as 'one-drive-one' and 'two-drive-one', has strong flexibility, ensures stable operation of equipment, can be reliably operated on line, and meets the continuous process requirements of petrochemical industry production.
Claims (4)
1. Main double frequency converter drags system of activestandby in petrochemical industry production, characterized by: the device comprises an incoming line power supply, wherein a liquid resistor RS and a short circuit breaker QF2 which are connected in parallel are arranged at the rear end of the incoming line power supply, an output end of the liquid resistor RS and the short circuit breaker QF2 which are connected in parallel is provided with a frequency converter A, a frequency converter B and a power frequency breaker QF6 which are connected in parallel, the parallel output ends of the three are connected with a variable frequency motor MD, and the variable frequency operation or the power frequency operation of the variable frequency motor MD is realized through the conversion of the breaker.
2. The active-standby dual-frequency-converter dragging system in petrochemical production according to claim 1, wherein a control box and a frequency converter control PLC are arranged in the frequency converter A and the frequency converter B, and the two control boxes are connected through dual-fiber communication.
3. The main-standby dual-frequency-converter dragging system in petrochemical production according to claim 2, wherein the frequency converter A and the frequency converter B are connected with a main control cabinet L1, the frequency converter A and the frequency converter B receive DCS commands in a main control cabinet L1 and send feedback signals to the DCS, the frequency converter A and the frequency converter B are located in a centralized control cabinet L2, and the frequency converter control PLC is in communication connection with a human-machine interface HMI in the centralized control cabinet L2.
4. The active-standby dual-frequency-converter dragging system in petrochemical production according to claim 3, wherein an input/output end of a PLC in the main control cabinet L1 is connected with switching ends and control ends of a step-down incoming breaker QF1, a short-circuit breaker QF2, a step-down outgoing breaker QF3, a frequency converter A incoming breaker QF4, a frequency converter A outgoing breaker QF5 and a power frequency breaker QF6, and an input/output end of a frequency converter control PLC is connected with switching ends and control ends of a frequency converter B incoming breaker QF7 and a frequency converter B outgoing breaker QF 8.
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| CN202120830274.9U CN214591238U (en) | 2021-04-21 | 2021-04-21 | Main-standby double-frequency-converter dragging system in petrochemical production |
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| CN202120830274.9U CN214591238U (en) | 2021-04-21 | 2021-04-21 | Main-standby double-frequency-converter dragging system in petrochemical production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113931830A (en) * | 2021-11-12 | 2022-01-14 | 华能伊敏煤电有限责任公司 | Combined type variable frequency control system and method for open-pit coal mine open-drainage system |
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2021
- 2021-04-21 CN CN202120830274.9U patent/CN214591238U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113931830A (en) * | 2021-11-12 | 2022-01-14 | 华能伊敏煤电有限责任公司 | Combined type variable frequency control system and method for open-pit coal mine open-drainage system |
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