CN101976998A - Variable-frequency driving device and control method thereof - Google Patents
Variable-frequency driving device and control method thereof Download PDFInfo
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- CN101976998A CN101976998A CN2010105308519A CN201010530851A CN101976998A CN 101976998 A CN101976998 A CN 101976998A CN 2010105308519 A CN2010105308519 A CN 2010105308519A CN 201010530851 A CN201010530851 A CN 201010530851A CN 101976998 A CN101976998 A CN 101976998A
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Abstract
The invention provides a variable-frequency driving device used for a first motor, a second motor and a third motor, and a control method thereof, and the device comprises a first frequency converter, a second frequency converter, a circuit breaker and a plurality of knife brakes, wherein the first frequency converter is electrically connected with the first motor via the first knife brake; the second frequency converter is electrically connected with the second motor via the second knife brake; the circuit breaker is electrically connected with the third motor; and the plurality of the knife brakes are respectively connected between the first frequency converter and the third motor, between the second frequency converter and the third motor, between the circuit breaker and the third motor, between the circuit breaker and the second motor and between the circuit breaker and the first motor. The variable-frequency driving device and the control method thereof can meet the requirements on rotation at regular intervals of the three motors, working frequency backup and balanced running, and improve the flexibility and the utilization rate of the use of the motors.
Description
Technical field
The present invention relates to the electrical control field, and relate in particular to a kind of frequency-conversion drive apparatus and control method thereof.
Background technology
Energy-saving and emission-reduction are one of current important process, frequency conversion drive has been listed one of National Development and Reform Committee's emphasis power-saving technology in, factory (for example at present, the power plant) three 50% capacity of separate unit machine configuration set (promptly, system's desired volume 50%) rotating machinery, as water supply pump, condensate pump, blower fan etc., all adopt two fortune, one operational mode that is equipped with in service.As shown in Figure 1, existing frequency-conversion drive apparatus comprises frequency converter U1, frequency converter U3, disconnecting link QS41-1, disconnecting link QS41-2, disconnecting link QS41-3, disconnecting link QS43-1, disconnecting link QS43-2, disconnecting link QS43-3 and circuit breaker Q F2-1, motor M 1 and motor M 3 are driven by frequency converter U1 and frequency converter U3 respectively, described disconnecting link QS41-1 and disconnecting link QS41-2 are located at frequency converter U1 two ends respectively, disconnecting link QS41-3 is located in the bypass of frequency converter U1, and the end that disconnecting link QS41-1 does not connect frequency converter U1 connects power supply (being bus I shown in the figure) through circuit breaker Q F41-1; Correspondingly, disconnecting link QS43-1 and disconnecting link QS43-2 are located at frequency converter U3 two ends respectively, and disconnecting link QS43-3 is located in the bypass of frequency converter U3, and the end that disconnecting link QS43-1 does not connect frequency converter U3 connects power supply (being bus II shown in the figure) through circuit breaker Q F43-1.Motor M 2 directly connects power supply via circuit breaker Q F2-1, with as the standby motor of power frequency.Break down or one of motor M 1 and motor M 3 break down or running time when long at one of frequency converter U1 and frequency converter U3, can make motor M 2 operations by conducting circuit breaker Q F2-1, and make break down or running time process motor quit work, thereby can guarantee that unit still can move as usual.Yet because motor M 2 directly is connected with power supply without frequency converter, so its power frequency (50Hz) is moved the throttling loss that caused and efficient reduction and can be made the economical operation benefit variation of unit.
For addressing the above problem, other proposes a kind of frequency conversion drive mode of one-to-one, as shown in Figure 2, the frequency conversion drive mode of this one-to-one and above-mentioned two fortune, the one operational mode difference that is equipped with are, set up disconnecting link QS42-1 at motor M 2, disconnecting link QS42-2, disconnecting link QS42-3 and frequency converter U2, it is equipped with a frequency converter at each motor, though this mode can solve the problem that throttling loss that the standby motor power frequency operation of power frequency caused and efficient reduce, yet it has set up a cover frequency converter and corresponding three switching disconnecting links, increased the cost of whole frequency-conversion drive apparatus, and increased the corresponding cost of overhaul, the investment repayment phase is long.In addition, because can't be as standby motor (because it needs long start-up time) through the motor of frequency converter driving, therefore, the frequency conversion drive mode of this one-to-one also can't satisfy the requirement of unit safety economical operation.
Summary of the invention
Existing two fortune one are equipped with and the existing above-mentioned defective of operational mode of one-to-one in order to overcome, and spy of the present invention provides a kind of frequency-conversion drive apparatus and control method thereof, and that this frequency-conversion drive apparatus has is with low cost, flexibility is high and satisfy the advantage of energy-conservation demand.
The frequency-conversion drive apparatus that is used for first, second and the 3rd motor provided by the invention comprises: first frequency converter, and this first frequency converter is electrically connected with described first motor via first disconnecting link; Second frequency converter, this second frequency converter is electrically connected with described second motor via second disconnecting link; Circuit breaker, this circuit breaker is electrically connected with described the 3rd motor; And a plurality of disconnecting links, these a plurality of disconnecting links are connected between first frequency converter and the 3rd motor, between second frequency converter and the 3rd motor, between described circuit breaker and the 3rd motor, between described circuit breaker and second motor and between the described circuit breaker and first motor.
Correspondingly, the control method that is used for the frequency-conversion drive apparatus of first, second and the 3rd motor provided by the invention comprises: when making described frequency-conversion drive apparatus be in normal operating conditions, described first disconnecting link of conducting, described second disconnecting link and be connected in described circuit breaker and the 3rd motor between disconnecting link, disconnect other disconnecting links, described first motor and described second motor move under the driving of described first frequency converter and described second frequency converter respectively; When described frequency-conversion drive apparatus is carried out handover operation, described first disconnecting link of conducting, be connected in disconnecting link between second frequency converter and the 3rd motor and the disconnecting link between described circuit breaker and described second motor, disconnect other disconnecting links, to switch to described first motor and described the 3rd motor moves respectively under the driving of described first frequency converter and described second frequency converter; And when making the operation of the standby motor of power frequency, the disconnecting link between the described circuit breaker of conducting and this circuit breaker and the standby motor of power frequency.
Frequency-conversion drive apparatus provided by the present invention has not only solved the problem of existing two fortune existing throttling losses of one operational mode that is equipped with and efficient reduction, and compared to the operational mode of existing one-to-one, reduced the use of frequency converter and disconnecting link, cost is lower, and can satisfy that three motors are rotated at regular intervals, power frequency is standby and the demand of equilibrium operating, improved flexibility and utilance that motor uses.
Description of drawings
Fig. 1 is the structural representation of existing two fortune, one operational mode that is equipped with;
Fig. 2 is the structural representation of the operational mode of existing one-to-one;
Fig. 3 is provided by the invention two structural representations that drag three frequency-conversion drive apparatus;
Fig. 4 is for dragging the structural representation of three frequency-conversion drive apparatus according to two of first embodiment of the invention; And
Fig. 5 is for dragging the structural representation of three frequency-conversion drive apparatus according to two of second embodiment of the invention.
Embodiment
For allow above-mentioned and other purposes of the present invention, feature and advantage can be more obvious, hereinafter will cooperate appended diagram, be described in detail below.
Fig. 3 is provided by the invention two structural representations that drag three frequency-conversion drive apparatus.As shown in Figure 3, the invention provides a kind of frequency-conversion drive apparatus that is used for first motor M 1, second motor M 2 and the 3rd motor M 3, this device comprises: the first frequency converter U1, and this first frequency converter U1 is electrically connected with described first motor M 1 via the first disconnecting link QS12; The second frequency converter U3, this second frequency converter U3 is electrically connected with described second motor M 3 via the second disconnecting link QS31; Circuit breaker Q F11, this circuit breaker Q F11 is electrically connected with described the 3rd motor M 2; And a plurality of disconnecting links, these a plurality of disconnecting links are respectively the disconnecting link QS21, the second frequency converter U3 that are connected between the first frequency converter U1 and the 3rd motor M 2 and the disconnecting link QS11 between disconnecting link QS23, described circuit breaker Q F11 between the 3rd motor M 2 and disconnecting link QS22, described circuit breaker Q F11 between the 3rd motor M 2 and the disconnecting link QS32 between second motor M 3 and the described circuit breaker Q F11 and first motor M 1.
Now describe provided by the invention two and drag the concrete course of work of three frequency-conversion drive apparatus in conjunction with Fig. 3.Shown in the first frequency converter U1 connect power supply (being bus I shown in the figure) via circuit breaker Q F1, the second frequency converter U3 connects power supply (being bus II shown in the figure) via circuit breaker Q F3, shown in the termination bus I that is not electrically connected of circuit breaker Q F11 with described the 3rd motor M 2.Notice that circuit breaker Q F1 herein and circuit breaker Q F3 and nonessential setting can be established as required.
When the frequency-conversion drive apparatus operate as normal, in the driving down-conversion operation of the first frequency converter U1 and the second frequency converter U3, the 3rd motor M 2 power frequencies are standby respectively for first motor M 1 and second motor M 3.At this moment, circuit breaker Q F1, circuit breaker Q F3, disconnecting link QS22, the first disconnecting link QS12 and the second disconnecting link QS31 conducting, circuit breaker Q F11, disconnecting link QS11, disconnecting link QS21, disconnecting link QS23 and disconnecting link QS32 disconnect.
When need carry out alternate operation, for example second motor M, 3 converting operations being switched is the 3rd motor M 2 converting operations, second motor M 3 by converting operation switch into power frequency standby, concrete switch step is as follows: with disconnecting link QS22 and second disconnecting link QS31 disconnection, disconnecting link QS32 and disconnecting link QS23 conducting, just switch to first motor M 1 and the 3rd motor M 2 converting operations this moment, and second motor M, 3 power frequencies are standby.Only switch to converting operation and second motor M 3 to switch to power frequency standby by converting operation be that example describes by power frequency is standby at this with the 3rd motor M 2, also can pass through according to actual needs disconnecting link QS11, the first disconnecting link QS12, disconnecting link QS21, disconnecting link QS22, disconnecting link QS23, the second disconnecting link QS31 and disconnecting link QS32 operate and carry out the switching of other situations, thereby can be under the situation that guarantees to reduce throttling loss and raise the efficiency, make the motor M 1 of winning, second motor M 3 and the 3rd motor M 2 obtain balanced the use, avoid because of long operational times break down, also can when motor breaks down, guarantee the not interrupt run of whole unit in addition.
In addition, frequency-conversion drive apparatus of the present invention also can be when one of the described first frequency converter U1 and second frequency converter U3 break down or have other faults, make the standby electric motor starting of power frequency move by the disconnecting link between conducting circuit breaker Q F11 and this circuit breaker Q F11 and the standby motor of power frequency, thereby guaranteed the continuous operation of whole unit.For example, under the standby situation of first motor M 1 and second motor M, 3 converting operations and the 3rd motor M 2 power frequencies, when the second frequency converter U3 breaks down, but conducting circuit breaker Q F11, disconnecting link QS22 start second motor M 3.More than can find out, frequency-conversion drive apparatus of the present invention has overcome existing one-to-one mode and has not possessed the standby defective of power frequency, has not only taken into account alternate operation simultaneously and power frequency is standby, and can be equipped with mode compared to existing two fortune one, only increased by a disconnecting link QS22, with low cost and energy-saving and emission-reduction.
Wherein, the control of described disconnecting link and circuit breaker can also can be carried out the control of described disconnecting link and circuit breaker by artificial realization by program control machine when detecting corresponding fault.
Fig. 4 is for dragging the structural representation of three frequency-conversion drive apparatus according to two of first embodiment of the invention.Be fail safe and the convenient maintenance that guarantees frequency-conversion drive apparatus of the present invention, provided by the invention two drag three frequency-conversion drive apparatus also can comprise a plurality of safety ground disconnecting links, these a plurality of safety ground disconnecting links are connected to the two ends of the described first frequency converter U1 and the two ends of the described second frequency converter U3, thereby can be when a certain frequency converter failure, make this frequency converter outage by the corresponding safety ground disconnecting link of conducting, so that this frequency converter is overhauled.As shown in Figure 4, the first frequency converter U1 two ends are connected to safety ground disconnecting link G1 and safety ground disconnecting link G2 respectively, the second frequency converter U3 two ends are connected to safety ground disconnecting link G3 and safety ground disconnecting link G4 respectively, thereby can be when for example the first frequency converter U1 breaks down, conducting safety ground disconnecting link G1 and safety ground disconnecting link G2, so that this first frequency converter U1 no current passes through, thereby it is overhauled, guarantee personal safety.
Fig. 5 is for dragging the structural representation of three frequency-conversion drive apparatus according to two of second embodiment of the invention.Provided by the invention two drag three frequency-conversion drive apparatus also can comprise a plurality of motor ground connection disconnecting links, these a plurality of motor ground connection disconnecting links are connected to described first motor M 1, second motor M 3 and the 3rd motor M 2 and the described first disconnecting link QS12, on the tie point of the second disconnecting link QS31 or a plurality of disconnecting links, thereby can be in first motor M 1, when second motor M 3 and/or the 3rd motor M 2 faults, make first motor M 1 by the corresponding motor ground connection of conducting disconnecting link, second motor M 3 and/or 2 outages of the 3rd motor M are so that to this first motor M 1, second motor M 3 and/or the 3rd motor M 2 are overhauled.As shown in Figure 5, be connected to motor ground connection disconnecting link GM1, motor ground connection disconnecting link GM2 and motor ground connection disconnecting link GM3 respectively on tie point C1, the tie point C2 of first motor M 1, second motor M 2 and the 3rd motor M 3 and the described first disconnecting link QS12, the second disconnecting link QS31 or a plurality of disconnecting links and the tie point C3, thereby can be when for example first motor M 1 breaks down, conducting motor ground connection disconnecting link GM1, so that first motor M, 1 no current passes through, thereby it is overhauled.
Wherein, described first motor M 1, second motor M 3 and the 3rd motor M 2 can be identical motor, to realize finishing the power output switching or make whole unit after the standby motor operation of power frequency with switching or make the standby motor operation of power frequency before identical.
The motor overcurrent definite value of frequency converter is one of main performance assessment criteria to frequency converter overload capacity; the overcurrent definite value that general frequency converter provides is 120% motor rated current and 1 minute specified time or inverse time lag; but in the actual motion during operating mode acute variation; cause the frequency converter overload easily; cause frequency converter failure to shut down or locking output, influence unit safety operation.Preferably, the overcurrent definite value of described first frequency converter and/or second frequency converter be set to 150% its when the rated current of the motor of front wheel driving and 1 minute inverse time-lag, the process system requirement can be satisfied preferably like this, the safe operation of unit long period can be guaranteed.Facts have proved, reduced the probability that equipment that frequency converter causes is unusually stopped transport by this parameter setting.
" rise time " of frequency converter and " fall time " are another the main performance assessment criteria to frequency converter overload capacity, often ignore this two parameters on the engineering, cause frequency converter often to transship.Preferably, the rise time of the described first frequency converter U1 and/or the second frequency converter U3 is set to its motor of working as front wheel driving 2-3 times by power frequency full voltage starting required time, be set to the first motor power frequency stoppage in transit coasting operation 1 times fall time, can either guarantee the risk that the dynamic response requirement of regulating system and frequency converter can not bring because of overload trip like this to 10% rated speed required time.
Correspondingly, the invention provides a kind of control method that is used for the frequency-conversion drive apparatus of first, second and the 3rd motor, this method comprises: when making described frequency-conversion drive apparatus be in normal operating conditions, described first disconnecting link of conducting, described second disconnecting link and be connected in described circuit breaker and the 3rd motor between disconnecting link, disconnect other disconnecting links, described first motor and described second motor move under the driving of described first frequency converter and described second frequency converter respectively; When described frequency-conversion drive apparatus is carried out handover operation, described first disconnecting link of conducting, be connected in disconnecting link between second frequency converter and the 3rd motor and the disconnecting link between described circuit breaker and described second motor, disconnect other disconnecting links, to switch to described first motor and described the 3rd motor moves respectively under the driving of described first frequency converter and described second frequency converter; And when making the operation of the standby motor of power frequency, the disconnecting link between the described circuit breaker of conducting and this circuit breaker and the standby motor of power frequency.The exemplary description of this method can be consulted above description at frequency-conversion drive apparatus, repeats no more in this.
Frequency-conversion drive apparatus of the present invention can realize that energy-saving and emission-reduction, alternate operation and power frequency are standby by switching flexibly, not only overcome existing two fortune one and be equipped with mode and cause the defective of throttling loss and inefficiency, and having overcome existing one-to-one mode, not possess power frequency standby and because of adopting three frequency converters to cause the higher defective of cost because of rotating at regular intervals.
Though the present invention is disclosed by the foregoing description, yet the foregoing description is not to be used to limit the present invention, and any the technical staff in the technical field of the invention without departing from the spirit and scope of the present invention, should make various changes and modification.Therefore protection scope of the present invention should be as the criterion with the scope that appended claims was defined.
Claims (6)
1. frequency-conversion drive apparatus that is used for first, second and the 3rd motor is characterized in that this device comprises:
First frequency converter, this first frequency converter is electrically connected with described first motor via first disconnecting link;
Second frequency converter, this second frequency converter is electrically connected with described second motor via second disconnecting link;
Circuit breaker, this circuit breaker is electrically connected with described the 3rd motor; And
A plurality of disconnecting links, these a plurality of disconnecting links are connected between first frequency converter and the 3rd motor, between second frequency converter and the 3rd motor, between described circuit breaker and the 3rd motor, between described circuit breaker and second motor and between the described circuit breaker and first motor.
2. device according to claim 1, wherein, this device also comprises a plurality of safety ground disconnecting links, these a plurality of safety ground disconnecting links are connected to the two ends of described first frequency converter and the two ends of described second frequency converter.
3. device according to claim 1, wherein, this device also comprises a plurality of motor ground connection disconnecting links, and these a plurality of motor ground connection disconnecting links are connected on the tie point of described first, second and the 3rd motor and described first disconnecting link, second disconnecting link or a plurality of disconnecting links.
4. according to the described device of each claim among the claim 1-3, wherein, the overcurrent definite value of described first frequency converter and/or second frequency converter is set to this first frequency converter of 150% and/or second frequency converter when the rated current of the motor of front wheel driving and 1 minute inverse time-lag.
5. according to the described device of each claim among the claim 1-3, wherein, the rise time of described first frequency converter and/or second frequency converter be set to this first frequency converter and/or second frequency converter when the motor of front wheel driving by the 2-3 of power frequency full voltage starting required time doubly, be set to this first frequency converter and/or second frequency converter fall time when the motor power frequency stoppage in transit coasting operation of front wheel driving 1 times to 10% rated speed required time.
6. one kind according to the described control method that is used for the frequency-conversion drive apparatus of first, second and the 3rd motor of each claim among the claim 1-5, and this method comprises:
When making described frequency-conversion drive apparatus be in normal operating conditions, described first disconnecting link of conducting, described second disconnecting link and be connected in described circuit breaker and the 3rd motor between disconnecting link, disconnect other disconnecting links, described first motor and described second motor move under the driving of described first frequency converter and described second frequency converter respectively;
When described frequency-conversion drive apparatus is carried out handover operation, described first disconnecting link of conducting, be connected in disconnecting link between second frequency converter and the 3rd motor and the disconnecting link between described circuit breaker and described second motor, disconnect other disconnecting links, to switch to described first motor and described the 3rd motor moves respectively under the driving of described first frequency converter and described second frequency converter; And
When the standby motor of power frequency is moved, the disconnecting link between the described circuit breaker of conducting and this circuit breaker and the standby motor of power frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105308519A CN101976998A (en) | 2010-10-29 | 2010-10-29 | Variable-frequency driving device and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105308519A CN101976998A (en) | 2010-10-29 | 2010-10-29 | Variable-frequency driving device and control method thereof |
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| CN101976998A true CN101976998A (en) | 2011-02-16 |
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| CN2010105308519A Pending CN101976998A (en) | 2010-10-29 | 2010-10-29 | Variable-frequency driving device and control method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332855A (en) * | 2011-05-25 | 2012-01-25 | 谢青云 | Motor control device for range hood |
| CN104022692A (en) * | 2013-02-28 | 2014-09-03 | 浙江万享科技有限公司 | Motor control circuit |
| AT14813U1 (en) * | 2014-12-22 | 2016-06-15 | Gerald Hehenberger | Drive train and method for operating a drive train |
| CN112019127A (en) * | 2019-05-31 | 2020-12-01 | 河南科锐特科技发展有限公司 | Online frequency conversion power frequency switched systems device |
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| CN2464013Y (en) * | 2001-02-16 | 2001-12-05 | 重庆钢铁(集团)有限责任公司 | Switchin device |
| CN200963876Y (en) * | 2006-11-06 | 2007-10-24 | 成都市新筑路桥机械股份有限公司 | Multifunctional double horizontal axis frequency conversion blender |
| CN101561664A (en) * | 2008-04-14 | 2009-10-21 | 中国洛阳浮法玻璃集团有限责任公司 | Method for controlling combined type double-control and double-purpose single-backup system and controller thereof |
| CN201928220U (en) * | 2010-10-29 | 2011-08-10 | 中国神华能源股份有限公司 | Variable frequency drive device |
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2010
- 2010-10-29 CN CN2010105308519A patent/CN101976998A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2464013Y (en) * | 2001-02-16 | 2001-12-05 | 重庆钢铁(集团)有限责任公司 | Switchin device |
| CN200963876Y (en) * | 2006-11-06 | 2007-10-24 | 成都市新筑路桥机械股份有限公司 | Multifunctional double horizontal axis frequency conversion blender |
| CN101561664A (en) * | 2008-04-14 | 2009-10-21 | 中国洛阳浮法玻璃集团有限责任公司 | Method for controlling combined type double-control and double-purpose single-backup system and controller thereof |
| CN201928220U (en) * | 2010-10-29 | 2011-08-10 | 中国神华能源股份有限公司 | Variable frequency drive device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332855A (en) * | 2011-05-25 | 2012-01-25 | 谢青云 | Motor control device for range hood |
| CN104022692A (en) * | 2013-02-28 | 2014-09-03 | 浙江万享科技有限公司 | Motor control circuit |
| AT14813U1 (en) * | 2014-12-22 | 2016-06-15 | Gerald Hehenberger | Drive train and method for operating a drive train |
| US10458524B2 (en) | 2014-12-22 | 2019-10-29 | Gerald Hehenberger | Drive train and method for operating a drive train |
| CN112019127A (en) * | 2019-05-31 | 2020-12-01 | 河南科锐特科技发展有限公司 | Online frequency conversion power frequency switched systems device |
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Application publication date: 20110216 |