CN211508943U - Optimal control system based on 660WM thermal power generating unit air preheater motor - Google Patents
Optimal control system based on 660WM thermal power generating unit air preheater motor Download PDFInfo
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- CN211508943U CN211508943U CN202020428910.0U CN202020428910U CN211508943U CN 211508943 U CN211508943 U CN 211508943U CN 202020428910 U CN202020428910 U CN 202020428910U CN 211508943 U CN211508943 U CN 211508943U
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- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model provides an optimal control system based on 660WM thermal power unit air preheater motor, including converter, control circuit and main power supply wiring, through the method that control circuit increases bypass contactor, realize that air preheater motor frequency conversion mode starts, then cuts the power frequency mode operation, the control mode of at last by power frequency mode outage. Through the technical scheme of the utility model, because the torque is larger when the air preheater motor is started, the frequency conversion mode is still kept for starting, the stable starting of the air preheater motor is ensured, and the conditions that the motor is damaged when the air preheater motor is directly started at power frequency are also avoided; after the motor of the air preheater is started, the operation is switched to a power frequency mode, so that the hidden danger of equipment shutdown caused by reasons such as overheating of the frequency converter 1 is avoided; the main motor and the auxiliary motor are isolated in control loop, so that the hidden danger of equipment that the main motor and the auxiliary motor are simultaneously powered off and shut down when the loop fails is avoided.
Description
Technical Field
The utility model relates to a motor control system technical field particularly, belongs to an optimal control system based on 660WM thermal power generating unit air preheater motor.
Background
The on-the-spot equipment that need low-speed start that can use of thermal power plant often, if directly use power frequency power supply to start, can cause equipment to damage because the moment of torsion is too big, generally can directly adopt 1 start-up of converter and operation at present on the market, nevertheless because site environment is abominable, the accident rate is higher.
A common air preheater motor control system is shown in fig. 1, and is a control mode of frequency conversion control and dual-motor standby. Taking a main motor control loop as an example, when a contact YQA (or a contact QA 2) is closed, a contactor CA is closed, a normally open contact of the contactor CA is closed, a frequency converter 1 is powered on to start, at the moment, the frequency converter 1 drives an air preheater motor to slowly start, and according to feedback information such as the rotating speed and current of the main motor, the frequency converter 1 gradually adjusts the frequency to rise to drive the main motor to start until the frequency converter 1 is stabilized to a certain stable frequency, and the air preheater motor runs stably; when the unit normally operates, the air preheater motor is driven by the frequency converter 1 to operate all the time; when the contact YTA (or the contact TA 2) is disconnected, the contactor CA loses power, the normally open contact is disconnected, the frequency converter 1 loses power, and the air preheater motor loses power and stops running. The above steps are the whole process of starting, running and stopping the main motor of the air preheater in a frequency conversion mode.
The starting, running and stopping of a common air preheater motor are all controlled by the frequency converter 1. During actual operation, the field working condition of the air preheater frequency converter 1 of the thermal power plant (or other industrial and mining enterprises with severe working environments) is severe: firstly, the amount of environmental dust is large, the dust is greatly accumulated in the frequency converter 1 through a cooling air channel of the frequency converter 1 under the driving of a cooling fan, the heat dissipation of the frequency converter 1 is seriously influenced, and particularly in summer, the temperature of the frequency converter 1 is sharply increased to form equipment hidden danger; secondly, the ambient temperature is high, especially in summer, and the temperature of the cabinet body can reach 70 ℃ at most due to direct sunlight.
Generally, the requirement on the operating environment of the frequency converter 1 is relatively strict (taking the emerson frequency converter 1 as an example, the operating environment temperature is required to be within a range of-10 ℃ to +40 ℃, and when the environmental temperature reaches 40 ℃ to 50 ℃, the frequency converter needs to be used in a derating manner), the field working condition obviously does not meet the requirement on the normal use condition of the frequency converter 1, and therefore the hidden danger of equipment shutdown is formed.
As can be seen from the drawing, in the original air preheater motor control loop, the main motor control loop and the auxiliary motor control loop are electrically connected at the secondary sides of the control transformers B1 and B2, and the main loop and the auxiliary loop cannot be mutually independent. When elements such as JQA and JQB fail, the simultaneous power loss of the main loop and the auxiliary loop, the simultaneous power loss of the CA and the CB and the return of the CA and the CB can be caused, and the air preheater is stopped, so that the load of a unit is reduced or non-stop accidents are caused finally. In conclusion, the original control mode of the motor of the air preheater and the operation reliability of the control loop are poor.
SUMMERY OF THE UTILITY MODEL
In order to compensate prior art's not enough, optimize the common control system of 660MW thermal power generating unit air preheater motor, the operating stability of hoisting system, the utility model provides an optimal control system based on 660WM thermal power generating unit air preheater motor.
The utility model discloses a realize through following technical scheme: an optimized control system based on a 660WM thermal power generating unit air preheater motor comprises a frequency converter, a control loop and a main power supply connection wire, wherein a main power supply connection terminal of the main power supply connection wire is connected with a first air switch and is used for the air switch of the main power supply loop of the air preheater, a lower opening connection terminal of the first air switch is connected with a first contactor, an upper opening of the frequency converter is connected with a reactor, an upper opening connection terminal of the reactor is connected with the first contactor, a lower opening connection terminal of the reactor is connected with a frequency converter input connection terminal of the reactor, an output connection terminal of the frequency converter is connected with a second contactor, the second contactor is connected with the main motor, and a third contactor is connected between an input end of the main motor; and a main power supply wiring terminal of the main power supply wiring is also connected with a second air switch, the second air switch is used for controlling the power supply of the loop to be switched on in an air preheater, and the second air switch is connected with the control loop through a control transformer.
The control loop comprises a DCS controller, a first relay, a frequency conversion loop and a power frequency loop; the first relay is used for controlling the relay for monitoring the power on of the loop; the frequency conversion loop consists of a starting frequency converter instruction contact of the DCS controller, a stopping frequency converter instruction contact of the DCS controller, a second relay, a third relay, a normally closed contact of a fifth relay, a first button and a third button; the second relay is connected with a stop frequency converter instruction contact of the DCS controller, a normally closed contact of the second relay is connected between the first contactor and a start frequency converter instruction of the DCS controller, a normally open contact of the third relay is connected with a start frequency converter instruction contact of the DCS controller and a first button respectively, the first button is used for on-site start of a frequency conversion loop, the third button is used for on-site stop of the frequency conversion loop, and a normally closed contact of the fifth relay is connected in series with the frequency conversion start loop; the power frequency loop consists of a starting power frequency instruction contact of the DCS controller, a stopping power frequency instruction contact of the DCS controller, a fourth relay, a fifth relay, a sixth relay, a second button and a fourth button; the normally open contact of fourth relay connects the start power frequency instruction contact and the second button of DCS controller respectively, and the second button is used for the start-up on spot of power frequency return circuit, and the fourth button is used for stopping on spot of power frequency return circuit, and the fifth relay connects in parallel on the third contactor, and the sixth relay connects in the stop power frequency instruction contact of DCS controller, and the normally closed contact of sixth relay connects between the start power frequency instruction contact of third contactor and DCS controller.
Preferably, the main motor power is 15 kW.
Further, the input end of the main motor is connected with a thermocouple.
As the preferred scheme, a 485 communication port is adopted on the frequency converter.
As preferred scheme, the normally open contact control of first contactor has connect first pilot lamp, and the normally closed contact control of first contactor has connect the second pilot lamp, and the normally open contact control of third contactor has connect the third pilot lamp, and the normally closed contact control of second contactor has connect the fourth pilot lamp.
Preferably, the input end of the main motor is connected with a current transducer.
Preferably, the input end of the main motor is connected with a current transducer.
The utility model discloses owing to adopted above technical scheme, compare with prior art and make it have following beneficial effect: the motor of the air preheater has larger torque when being started, and the variable frequency mode is still reserved for starting, so that the stable starting of the motor of the air preheater is ensured, and the conditions of motor damage and the like when the motor of the air preheater is directly started at power frequency are also avoided; after the motor of the air preheater is started, the operation is switched to a power frequency mode, so that the hidden danger of equipment shutdown caused by reasons such as overheating of the frequency converter 1 is avoided; the main motor and the auxiliary motor are isolated in control loop, so that the hidden danger of equipment that the main motor and the auxiliary motor are simultaneously powered off and shut down when the loop fails is avoided.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a control circuit diagram of a frequency conversion mode of a motor of a common air preheater;
fig. 2 is a control loop diagram of the frequency conversion mode of the air preheater motor of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The following specifically explains an optimization control system based on 660WM thermal power generating unit air preheater motor according to an embodiment of the present invention with reference to fig. 2.
As shown in fig. 2, the utility model provides an optimization control system based on 660WM thermal power generating unit air preheater motor, including converter 1, control circuit 2 and main power supply wiring, wherein, main power supply binding post X1, X2, X3 of main power supply wiring connect first empty ZKA1 that opens, and first empty ZKA1 that opens is used for the empty division of air preheater main power supply circuit power; the lower opening wiring terminals X10, X20 and X30 of the first air switch ZKA1 are connected with a first contactor KM1, the first contactor KM1 is a contactor at the power supply side of the frequency converter, after the first contactor KM1 is controlled by a frequency conversion starting loop to be powered on, a KM1 normally open contact is closed, the power supply side of the frequency converter is powered on, and the frequency converter is connected with a power supply.
The upper port of the frequency converter 1 is connected with a reactor L1, and the reactor L1 is used for suppressing the harmonic waves of a frequency converter loop; reactor L1 is gone up mouthful binding post X11, X21, X31 and is connect first contactor KM1, reactor L1 is mouthful binding post X12 down, X22, X32 connect reactor L1's converter 1 input binding post, the output binding post X13 of converter 1, X23, X33 second contactor KM2, second contactor KM2 is converter load side contactor, after frequency conversion starting circuit control second contactor KM2 received the electricity, second contactor KM2 normally open contact closed, converter load side received the electricity, the converter output, the motor frequency conversion state received the electricity and started. The second contactor KM2 is connected with a main motor M1, and a third contactor KM3 is connected between the input end of the main motor M1 and lower port wiring terminals X10, X20 and X30 of the first air switch ZKA 1; the third contactor KM3 is a power frequency contactor, after the power frequency starting circuit controls the third contactor KM3 to be electrified, the normally open contact of the third contactor KM3 is closed, the power supply circuit of the motor is switched to a power frequency bypass, and the motor runs in a power frequency mode. And a main power supply terminal of a main power supply wire is also connected with a second air switch QF1, the second air switch QF1 is used for air switching of a control loop power supply of the air preheater, the second air switch QF1 is connected with the control loop 2 through a control transformer BK1, and the transformer BK1 converts a main power supply BC phase line power supply 380V into 220V to supply power for the control loop.
The control loop 2 comprises a DCS controller, a first relay JA1, a frequency conversion loop and a power frequency loop; first relay JA1 is used to control the relay which the loop is electrically active to monitor.
The frequency conversion loop is composed of a starting frequency converter instruction contact of the DCS controller, a stopping frequency converter instruction contact of the DCS controller, a second relay JA2, a third relay JA3, a normally closed contact of a fifth relay JA5, a first button QA2 and a third button TA 1.
The second relay JA2 is connected with a stop frequency converter instruction contact of the DCS controller, a normally closed contact of the second relay JA2 is connected between a start frequency converter instruction of the first contactor KM1 and the DCS controller, the second relay JA2 is a remote control mode frequency conversion stop relay, the remote DCS stop instruction starts the JA2 relay, the normally closed contact of the JA2 relay is disconnected, the first contactor KM1 loses power, and the frequency converter stops running.
The normally open contact of the third relay JA3 is respectively connected with a starting frequency converter instruction contact and a first button QA2 of the DCS controller, the third relay JA3 and a frequency converter starting loop holding relay, after the frequency converter loop is started, the JA3 relay is electrified, the normally open contact of the JA3 is used for holding the remote/local starting frequency converter instruction contact, and the frequency converter starting loop is electrified; the first button QA2 is used for the on-site start of the inverter circuit and the third button TA1 is used for the on-site stop of the inverter circuit.
A normally closed contact of a fifth relay JA5 is connected in series with the variable frequency starting circuit; the fifth relay JA5 is a frequency conversion locking relay, when the power frequency mode is started, the JA5 relay is electrified, and the frequency conversion loop is locked and started at the moment through a normally closed contact of JA5 connected in series in the frequency conversion starting loop.
The power frequency loop consists of a starting power frequency instruction contact of the DCS controller, a stopping power frequency instruction contact of the DCS controller, a fourth relay JA4, a fifth relay JA5, a sixth relay JA6, a second button QA3 and a fourth button TA 2.
The normally open contact of the fourth relay JA4 is respectively connected with a starting power frequency instruction contact and a second button QA3 of the DCS controller, the fourth relay JA4 is a motor power frequency mode starting loop holding relay, after the power frequency loop is started, the JA4 relay is electrified, the normally open contact of the JA4 is used for holding the remote/local starting power frequency loop instruction contact, the power frequency starting loop is electrified, the second button QA3 is used for local starting of the power frequency loop, and the fourth button TA2 is used for local stopping of the power frequency loop.
The fifth relay JA5 is connected in parallel to the third contactor KM3, the sixth relay JA6 is connected to a power frequency stopping instruction contact of the DCS controller, the sixth relay JA6 is a remote control mode power frequency stopping relay, a remote DCS stopping instruction starts the JA6 relay, a normally closed contact of the JA6 relay is disconnected, KM3 is powered off, the motor stops running in a power frequency mode, and the normally closed contact of the sixth relay JA6 is connected between the third contactor KM3 and a power frequency starting instruction contact of the DCS controller.
The main motor M1 was 15kW in power. The input end of the main motor M1 is connected with a thermocouple RJA, when the motor is overloaded, the thermocouple acts, a RJA normally closed contact connected with a control circuit is disconnected, and the motor is controlled to stop.
And a 485 communication port is adopted on the frequency converter 1.
The normally open contact control of first contactor KM1 has connect first pilot lamp XDA3, as frequency conversion return circuit power-on state feedback instruction, the normally closed contact control of first contactor KM1 has connected second pilot lamp XDA4, as frequency conversion return circuit power-off state feedback instruction, the normally open contact control of third contactor KM3 has connected third pilot lamp XDA5, as power frequency return circuit power-on state feedback instruction, the normally closed contact control of second contactor KM3 has connected fourth pilot lamp XDA6, as power frequency return circuit power-off state feedback instruction.
The input end of the main motor M1 is connected with current transmitters Af1 and Af2, the current transmitters Af1 and Af2 convert the phase current of a motor input loop A, B into milliampere quantity, and the milliampere quantity is fed back to a DCS system to be used as the motor running current of a remote monitoring air preheater.
As can be seen by combining the figure 2, the main motor control loop and the auxiliary motor control loop are completely in no electric connection, and the hidden danger that the main motor and the auxiliary motor lose power and stop running simultaneously when the fault does not exist any more. The control mode of the motor of the air preheater is improved, the frequency conversion mode starting of the motor of the air preheater is realized by a method of adding a bypass contactor in a control loop, then the motor of the air preheater is operated in a power frequency switching mode, and finally the motor of the air preheater is stopped in the power frequency switching mode. Namely: when a DCS contact (or a contact QA 2) is closed, the contactors KM1 and KM2 are attracted, a normally open contact is closed, the frequency converter 1 is electrified to be started, and the air preheater motor is driven to be started until the operation is stable, so that the frequency conversion mode starting of the motor is realized;
when the frequency is increased to 50Hz, a stopping instruction is sent by personnel, the contactors KM1 and KM2 lose power, normally open contacts of the contactors are disconnected, the frequency converter 1 loses power and stops running, after the DCS logically judges that a stopping signal (current, rotating speed and state feedback are two) of the frequency converter 1, a starting power frequency running instruction is sent in an interlocking mode, the contactor KM3 is attracted, the normally open contacts of the contactor are closed, the motor of the air preheater is powered on to be directly started in power frequency, the motor is continuously operated in power frequency after being started (the inertia of the air preheater is larger, the inertia time is generally about 20 seconds, the frequency converter 1 stops to a combined starting power frequency switch to be switched on for about 2 seconds, the smooth starting of the power frequency of the air preheater can be realized, the air preheater cannot be stopped to rotate and run), and the power frequency mode; if the DCS does not receive the power frequency power-on signal feedback and the current (8A) feedback within 3 seconds, judging that the power frequency mode fails to start, and starting the standby motor in a frequency conversion mode in an interlocking mode to operate as a backup means for the failure of the process of switching the power frequency mode; when the motor is stopped, the DCS contact is closed (or the contact TA2 is disconnected), the contactor KM3 loses power, the normally open contact is disconnected, the motor of the air preheater loses power and stops running, and the power frequency mode of the motor is realized.
The motor of the air preheater has larger torque when being started, and the variable frequency mode is still reserved for starting, so that the stable starting of the motor of the air preheater is ensured, and the conditions of motor damage and the like when the motor of the air preheater is directly started at power frequency are also avoided; after the motor of the air preheater is started, the operation is switched to a power frequency mode, so that the hidden danger of equipment shutdown caused by reasons such as overheating of the frequency converter 1 is avoided; the main motor and the auxiliary motor are isolated in control loop, so that the hidden danger of equipment that the main motor and the auxiliary motor are simultaneously powered off and shut down when the loop fails is avoided.
In consideration of energy saving and consumption reduction, the frequency converter 1 is increasingly added to the air preheater motor, but for important auxiliary machines such as the air preheater motor, the operation reliability of the auxiliary machines is considered, and the problems of field operation conditions and the like of equipment must be considered during design; for main equipment and backup equipment of an important auxiliary machine, loop isolation is needed to be carried out, complete mutual independence of the main equipment and the auxiliary equipment is achieved, a real backup effect is achieved, and otherwise equipment hidden danger points are increased.
In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An optimized control system based on a 660WM thermal power unit air preheater motor comprises a frequency converter, a control loop and a main power supply connection wire, and is characterized in that a main power supply connection terminal of the main power supply connection wire is connected with a first air switch and used for the air switch of the main power supply loop of the air preheater, a lower opening connection terminal of the first air switch is connected with a first contactor, an upper opening of the frequency converter is connected with a reactor, an upper opening connection terminal of the reactor is connected with the first contactor, a lower opening connection terminal of the reactor is connected with an input connection terminal of the frequency converter of the reactor, an output connection terminal of the frequency converter is connected with a second contactor, the second contactor is connected with the main motor, and a third contactor is connected between the input end of the main; the main power supply wiring terminal of the main power supply wiring is also connected with a second air switch, the second air switch is used for the air preheater control loop to control the power supply air switch, and the second air switch is connected with the control loop through a control transformer;
the control loop comprises a DCS controller, a first relay, a frequency conversion loop and a power frequency loop; the first relay is used for controlling the relay for monitoring the power on of the loop; the frequency conversion loop consists of a starting frequency converter instruction contact of the DCS controller, a stopping frequency converter instruction contact of the DCS controller, a second relay, a third relay, a normally closed contact of a fifth relay, a first button and a third button; the second relay is connected with a stop frequency converter instruction contact of the DCS controller, a normally closed contact of the second relay is connected between the first contactor and a start frequency converter instruction of the DCS controller, a normally open contact of the third relay is connected with a start frequency converter instruction contact of the DCS controller and a first button respectively, the first button is used for on-site start of a frequency conversion loop, the third button is used for on-site stop of the frequency conversion loop, and a normally closed contact of the fifth relay is connected in series with the frequency conversion start loop; the power frequency loop consists of a starting power frequency instruction contact of the DCS controller, a stopping power frequency instruction contact of the DCS controller, a fourth relay, a fifth relay, a sixth relay, a second button and a fourth button; the normally open contact of fourth relay connects the start power frequency instruction contact and the second button of DCS controller respectively, and the second button is used for the start-up on spot of power frequency return circuit, and the fourth button is used for stopping on spot of power frequency return circuit, and the fifth relay connects in parallel on the third contactor, and the sixth relay connects in the stop power frequency instruction contact of DCS controller, and the normally closed contact of sixth relay connects between the start power frequency instruction contact of third contactor and DCS controller.
2. The optimal control system based on the 660WM thermal power generating unit air preheater motor as claimed in claim 1, wherein the main motor power is 15 kW.
3. The optimal control system based on the 660WM thermal power generating unit air preheater motor as claimed in claim 1 or 2, wherein the input end of the main motor is connected with a thermocouple.
4. The optimal control system based on the 660WM thermal power generating unit air preheater motor as claimed in claim 1, wherein a 485 communication port is adopted on the frequency converter.
5. The optimized control system based on the 660WM thermal power generating unit air preheater motor as claimed in claim 1, wherein the normally open contact control of the first contactor is connected with a first indicator lamp, the normally closed contact control of the first contactor is connected with a second indicator lamp, the normally open contact control of the third contactor is connected with a third indicator lamp, and the normally closed contact control of the second contactor is connected with a fourth indicator lamp.
6. The optimal control system based on the 660WM thermal power generating unit air preheater motor as claimed in claim 1, wherein the input end of the main motor is connected with a current transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020428910.0U CN211508943U (en) | 2020-03-30 | 2020-03-30 | Optimal control system based on 660WM thermal power generating unit air preheater motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020428910.0U CN211508943U (en) | 2020-03-30 | 2020-03-30 | Optimal control system based on 660WM thermal power generating unit air preheater motor |
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| CN211508943U true CN211508943U (en) | 2020-09-15 |
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| CN202020428910.0U Expired - Fee Related CN211508943U (en) | 2020-03-30 | 2020-03-30 | Optimal control system based on 660WM thermal power generating unit air preheater motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922706A (en) * | 2021-09-30 | 2022-01-11 | 华能汕头海门发电有限责任公司 | Frequency conversion control system of boiler air preheater |
-
2020
- 2020-03-30 CN CN202020428910.0U patent/CN211508943U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922706A (en) * | 2021-09-30 | 2022-01-11 | 华能汕头海门发电有限责任公司 | Frequency conversion control system of boiler air preheater |
| CN113922706B (en) * | 2021-09-30 | 2023-07-25 | 华能汕头海门发电有限责任公司 | Variable frequency control system of boiler air preheater |
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Granted publication date: 20200915 |