CN212785182U - Frequency converter topological structure with redundancy function - Google Patents
Frequency converter topological structure with redundancy function Download PDFInfo
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- CN212785182U CN212785182U CN202021959530.6U CN202021959530U CN212785182U CN 212785182 U CN212785182 U CN 212785182U CN 202021959530 U CN202021959530 U CN 202021959530U CN 212785182 U CN212785182 U CN 212785182U
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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
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model relates to a frequency converter topological structure with redundant function, the frequency converter topological structure with redundant function include two sets of frequency converters with the same structure and two input switches and two output switches respectively arranged at two ends of the two frequency converters, the frequency converter comprises a control unit and a main circuit unit, the control units of the two sets of frequency converters are connected through optical fibers or cables, each control unit is connected with the main circuit unit of the frequency converter through optical fibers or cables, and is also connected with the main circuit unit of the other set of frequency converter through optical fibers or cables, when the frequency converter works normally, the main circuit units of the two sets of frequency converters are simultaneously output, the control unit of one set of frequency converter is used as a main control unit, the control unit of the other set of frequency converter is used as a standby control unit, when the main circuit or the control unit of one set of frequency converter breaks down, the motor can continue to operate without stopping, and the reliability is high.
Description
Technical Field
The utility model relates to a converter topological structure especially relates to a converter topological structure with redundant function, is applied to motor variable frequency speed governing drive field.
Background
In the large-scale production of the mechanical and chemical industry, in the application occasions where certain production processes must be continuous, such as the industries of petrifaction, metallurgy and the like, once a certain device in the process flow breaks down, huge economic loss and even safety accidents occur. Therefore, the production equipment is required to have very high reliability, and the mean time to failure is required to be more than several tens of thousands of hours. If the variable frequency driving motor is adopted in the occasions, the frequency converter is complex in system due to the fact that the number of components is large, and the reliability of the frequency converter is weak in the system, so that the improvement of the reliability of the variable frequency driving system is of great significance. Through document retrieval, a method for improving system reliability by adopting redundancy configuration exists, for example, a unit cascade type high-voltage frequency converter is adopted to provide a power unit bypass function, but the problem that a single power unit fails can be solved, and other faults of the whole machine or power supply faults and the like cannot be solved; the method of controlling the redundancy of the power supply or the control system is adopted, so that the problem that only one set of control power supply fails or one set of control system fails can be solved, and the problem that the main power supply and the main circuit fail cannot be solved; there is also a method for implementing redundant operation by using 2 or more frequency converters, but the known scheme using this method has the following problems: 1) some schemes are cold standby modes, namely one frequency converter drives a motor, other frequency converters are used as standby machines, after the frequency converter of the driving motor breaks down, the standby machine frequency converter is used for driving the motor, the switching time exists, the rotating speed of the motor is greatly dropped or interrupted in a short time, and the requirements of some process applications are not met; 2) a hot standby mode is also adopted, namely 2 or more frequency converters are connected in parallel to drive 1 motor, and because the output pulses of the two frequency converters are asynchronous, the output needs to be added with an inductor to realize current sharing, so that the system cost is increased; 3) in addition, the scheme utilizes 3 or more frequency converters to realize redundant driving, wherein one frequency converter is used as a host and is responsible for the current sharing control of the slave, the cost is high, and the problem of reliability after the fault of a host control system is not solved; and the system structure is complicated, the number of components is large, and the reliability of the system is reduced.
Disclosure of Invention
An object of the utility model is to overcome the problem that exists among the prior art, disclose a converter topological structure with redundant function, when one of them set of converter's main circuit or the control unit broke down, the motor can not shut down and continue the operation, and the converter need not additionally increase the reactor that flow equalizes, with low costs, the reliability is high.
The utility model discloses a realize like this: a frequency converter topological structure with a redundancy function is characterized in that: the frequency converter topology structure with the redundancy function comprises two sets of frequency converters with the same structure which are mutually connected through optical fibers or cables, each frequency converter comprises a control unit and a main circuit unit, an input switch and an output switch are respectively arranged at two ends of each frequency converter, the two sets of frequency converters are respectively a first frequency converter and a second frequency converter, correspondingly, the control units are respectively a first control unit and a second control unit, the main circuit units are respectively a first main circuit unit and a second main circuit unit, the arranged input switches are respectively a first input switch and a second input switch, the arranged output switches are respectively a first output switch and a second output switch, the first input switch is used as the input end of the first frequency converter and is connected with the input end of the first main circuit unit on the first frequency converter, the output end of the first main circuit unit is connected with the first output switch and then is connected with a motor through a cable, the second input switch is used as the input end of the second frequency converter and is connected with the input end of a second main circuit unit on the second frequency converter, the output end of the second main circuit unit is connected with a second output switch and then is connected with the motor through a cable, meanwhile, a first control unit on the first frequency converter and a second control unit on the second frequency converter are connected with each other through optical fibers or cables, the first control unit is also connected with the first main circuit unit and the second main circuit unit through the optical fibers or cables, and a second control unit on the second frequency converter is also connected with the first main circuit unit and the second main circuit unit through the optical fibers or cables. A main circuit unit of the frequency converter adopts a three-phase circuit, and the voltage grade is 220-35 kV alternating current.
The utility model discloses converter topological structure's with redundant function first converter input is connected to same section electric wire netting generating line with the parallelly connected back of second converter input, also can be connected to two sections different electric wire netting generating lines respectively with first converter input and second converter input.
The utility model has the advantages that:
1. the topological structure can solve the problem of the failure of one set of control system and the problem of the failure of one set of main circuit, and improves the reliability of the system.
2. In a field with two sections of power grid buses for power supply, the power supplies of the two sets of frequency converters can be connected to different buses, the problem of failure of the main power supply can be solved, and the reliability of the system is further improved.
3. The frequency converter does not need to additionally increase a current sharing reactor or an additional main controller, the cost is low, the number of components is small, and the system reliability is higher.
4. After one set of control system or main circuit is in fault, the system is not stopped, no shutdown switching time is provided, and the operation is stable and uninterrupted.
Drawings
Fig. 1 is a block diagram schematically illustrating the structure of the present invention.
Fig. 2 is a block diagram schematically illustrating the structure of embodiment 1 of the present invention.
Fig. 3 is a block diagram schematically illustrating the structure of embodiment 2 of the present invention.
In the figure: 1. a first input switch; 2. A first frequency converter; 3. A first output switch; 4. A second input switch; 5. A second frequency converter; 6. A second output switch; 7. A motor; 201. A first control unit; 202. A first main circuit unit; 501. A second control unit; 502. A second main circuit unit.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
According to the attached drawing 1, the utility model relates to a converter topological structure with redundant function, converter topological structure with redundant function include the same converter of two sets of structures through optic fibre or cable interconnect, the converter include the control unit and main circuit unit, and both ends are equipped with input switch and output switch respectively, two sets the converter be first converter 2 and second converter 5 respectively, correspondingly, the control unit is first the control unit 201 and second the control unit 501 respectively, the main circuit unit is first the main circuit unit 202 and second the main circuit unit 502 respectively, the input switch of setting is first the input switch 1 and second input switch 4 respectively, the output switch of setting is then first the output switch 3 and second the output switch 6 respectively. The first input switch 1 is used as an input end of the first frequency converter 2 and connected with an input end of a first main circuit unit 202 on the first frequency converter 2, and an output end of the first main circuit unit 202 of the first frequency converter 2 is connected with the first output switch 3 and then connected to the motor 7 through a cable. The second input switch 4 is used as an input end of the second frequency converter 5 and connected with an input end of a second main circuit unit 502 on the second frequency converter 5, and an output end of the second main circuit unit 502 of the second frequency converter 5 is connected with a second output switch 6 and then connected to a motor 7 through a cable. Meanwhile, the first control unit 201 of the first frequency converter 2 and the second control unit 512 of the second frequency converter 5 are connected to each other through an optical fiber or a cable, the first control unit 201 of the first frequency converter 2 is further connected to the first main circuit unit 202 of the first frequency converter 2 and the second main circuit unit 502 of the second frequency converter 5 through an optical fiber or a cable, respectively, and the second control unit 501 of the second frequency converter 5 is also connected to the first main circuit unit 202 of the first frequency converter 2 and the second main circuit unit 502 of the second frequency converter 5 through an optical fiber or a cable, respectively. The main circuit units of the two frequency converters are three-phase circuits, and the voltage grade is 220-35 kV alternating current.
During normal work, first input switch 1, second input switch 4, first output switch 3 and second output switch 6 are all closed, first converter 2 with second converter 5 is all worked, first control unit 201 with second control unit 501 is as main control unit and standby control unit operation respectively according to the ready order after the circular telegram, and the person of readiness is as main control unit earlier, and the person of readiness is as standby control unit later. The main control unit runs a motor control algorithm and outputs a driving pulse to simultaneously control the first main circuit unit 202 and the second main circuit unit 502; the standby control unit synchronizes the control parameters of the main control unit, but does not output driving pulses, and after the main control unit fails, the standby control unit is converted into the main control unit to operate. The main circuit unit 202 and the main circuit unit 502 are not divided into a master circuit and a slave circuit, and because the master control unit controls the first main circuit unit 202 and the second main circuit unit 502 at the same time, the output pulses of the first main circuit unit 202 and the second main circuit unit 502 can be synchronized, and the current sharing control of the first main circuit unit 202 and the second main circuit unit 502 can be realized without adding a current sharing reactor in the output.
The capacities of the first main circuit unit 202 and the second main circuit unit 502 are both greater than the power of the motor during model selection, when the first main circuit unit 202 fails, the control system will block the output pulse of the main circuit unit 202, and the second main circuit unit 502 works alone to continue driving the motor to operate. After the output pulse of the first main circuit unit 202 is blocked, a user can sequentially disconnect the first output switch 3 and the first input switch 3, detach the main circuit unit 202 for maintenance, and after maintenance, if the unit returns to normal, the unit can be reloaded, and the first input switch 1 and the first output switch 3 are sequentially closed, and the control system detects that the unit is normal and returns to the common output state of the two main circuit units. No current interruption exists in the switching process, and the motor runs without fluctuation.
When the second main circuit unit 502 fails, its operation state and operation procedure are the same as those when the first main circuit unit 202 fails.
The first control unit 201 is used as a main control unit, and the second control unit 501 is used as a standby control unit to explain the operation state and operation steps when the control unit fails. When the second control unit 501 fails, the control unit 501 operates as a standby control unit at this time, does not participate in the driving of the main circuit unit, and has no influence on the operation of the system. When the first control unit 201 fails, the control unit 201 is a main control unit, the main control unit actively blocks the driving pulse and notifies the standby control unit 501, and the standby control unit 501 receives a failure signal of the main control unit, then switches to the main control unit to operate, and continues to operate according to the synchronous control parameters. The user may remove the control unit 201 for maintenance or replace with a new control unit and operate it as a backup control unit after recovery.
Example 1:
according to the attached drawing 2, the utility model discloses be connected to same section electric wire netting generating line after 2 inputs of first converter with redundant function's converter topological structure connect in parallel with 5 inputs of second converter. The wiring method can be adopted when only one bus is powered on the site, the embodiment can realize that when one set of control unit fails, the control unit is switched to the control unit thermal redundancy function driven by the other set of control unit to operate, and can also realize the main circuit unit thermal redundancy function except for the power grid failure, thereby improving the reliability of the system.
Example 2:
according to the attached drawing 3, the utility model discloses 2 inputs of first converter and 5 inputs of second converter of converter topological structure with redundant function are connected to two sections different electric wire netting generating lines respectively. When one section of bus has a fault, the main circuit unit powered by the bus has a fault, and the system can be driven by the other main circuit unit to operate continuously.
The above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications, changes and substitutions can be made on the embodiments according to the present invention, and these modifications, changes and substitutions should fall within the scope of the present invention. The protection scope of the present invention is subject to the description of the claims of the present application.
Claims (4)
1. A frequency converter topological structure with a redundancy function is characterized in that: the frequency converter topology structure with the redundancy function comprises two sets of frequency converters with the same structure which are mutually connected through optical fibers or cables, each frequency converter comprises a control unit and a main circuit unit, an input switch and an output switch are respectively arranged at two ends of each frequency converter, the two sets of frequency converters are respectively a first frequency converter and a second frequency converter, correspondingly, the control units are respectively a first control unit and a second control unit, the main circuit units are respectively a first main circuit unit and a second main circuit unit, the arranged input switches are respectively a first input switch and a second input switch, the arranged output switches are respectively a first output switch and a second output switch, the first input switch is used as the input end of the first frequency converter and is connected with the input end of the first main circuit unit on the first frequency converter, the output end of the first main circuit unit is connected with the first output switch and then is connected with a motor through a cable, the second input switch is used as the input end of the second frequency converter and is connected with the input end of a second main circuit unit on the second frequency converter, the output end of the second main circuit unit is connected with a second output switch and then is connected with the motor through a cable, meanwhile, a first control unit on the first frequency converter and a second control unit on the second frequency converter are connected with each other through optical fibers or cables, the first control unit is also connected with the first main circuit unit and the second main circuit unit through the optical fibers or cables, and a second control unit on the second frequency converter is also connected with the first main circuit unit and the second main circuit unit through the optical fibers or cables.
2. The frequency converter topology with redundancy function according to claim 1, characterized by: a main circuit unit of the frequency converter adopts a three-phase circuit, and the voltage grade is 220-35 kV alternating current.
3. The frequency converter topology with redundancy function according to claim 1, characterized by: and the first input end and the second input end of the frequency converter topological structure are connected in parallel and then are connected to the same section of power grid bus.
4. The frequency converter topology with redundancy function according to claim 1, characterized by: and a first input end and a second input end of the frequency converter topological structure are respectively connected to two sections of different power grid buses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021959530.6U CN212785182U (en) | 2020-09-09 | 2020-09-09 | Frequency converter topological structure with redundancy function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021959530.6U CN212785182U (en) | 2020-09-09 | 2020-09-09 | Frequency converter topological structure with redundancy function |
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| Publication Number | Publication Date |
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| CN212785182U true CN212785182U (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021959530.6U Active CN212785182U (en) | 2020-09-09 | 2020-09-09 | Frequency converter topological structure with redundancy function |
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| CN (1) | CN212785182U (en) |
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2020
- 2020-09-09 CN CN202021959530.6U patent/CN212785182U/en active Active
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