CN218301253U - High-voltage frequency conversion soft starting device configured by single-phase low-voltage output reactor - Google Patents
High-voltage frequency conversion soft starting device configured by single-phase low-voltage output reactor Download PDFInfo
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- CN218301253U CN218301253U CN202222627242.6U CN202222627242U CN218301253U CN 218301253 U CN218301253 U CN 218301253U CN 202222627242 U CN202222627242 U CN 202222627242U CN 218301253 U CN218301253 U CN 218301253U
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Abstract
The utility model discloses an adopt soft starting drive of high-pressure frequency conversion of single-phase low voltage output reactor configuration belongs to motor control technical field, characterized by: including an electric network
A high-voltage AC motor M, a high-voltage frequency converter N, and three contactors
Low voltage output reactor
(ii) a Contactor with a magnetic circuit having a magnetic core
One end and the power grid
One end of the frequency converter is connected with the input side of the frequency converter N; contactor with a magnetic circuit having a magnetic core
One end and the power grid
One end of the high-voltage alternating current motor M is connected with the power supply;
one end is connected with the output side of the high-voltage frequency converter N, and the other end is connected with the high-voltage alternating current motor M. High-voltage frequency converter N is connected in series for each phase
A power unit and a low-voltage output reactor by controlling the contactor
The frequency conversion and power frequency smooth switching is realized, the impact current is effectively inhibited, and the safety of the system is protected.
Description
Technical Field
The utility model relates to a motor control technology field, concretely relates to adopt soft starting drive of high-pressure frequency conversion of single-phase low pressure output reactor configuration.
Background
At present, the high-voltage frequency converter has high utilization rate in the speed regulation process of a high-voltage motor, and the three-level voltage source type high-voltage frequency converter and the unit series connection multi-level high-voltage frequency converter occupy the main position in the high-voltage frequency converter. The unit series multilevel high-voltage frequency converter is most widely applied and has absolute advantages in the high-voltage field. In the soft starting process of the high-voltage frequency converter, because voltage waveforms output by the frequency converter are formed by superposition and are not smooth sine waves, in order to prevent overcurrent faults from occurring when the power frequency is switched and to cause switching failure, a unit module is damaged, and a three-phase output reactor with a very high withstand voltage value is required to be connected in series at the output side of the frequency converter to reduce the impact of current. In order to adapt to high-voltage output current, the voltage grade of a three-phase output reactor needs to be high enough, the number of corresponding packaging layers is increased, the size is increased, and the cost is increased, so that great challenges are provided for the structural design, the insulation level, the thermal stability and the like of the reactor, and the maintenance of the reactor is difficult if the reactor is damaged.
SUMMERY OF THE UTILITY MODEL
For solving above problem, the utility model provides an adopt soft starting drive of high-pressure frequency conversion of single-phase low-voltage output reactor configuration, the device adopt former three-phase high-voltage output reactor of three single-phase low-voltage output reactor replacement, have solved the too big problem of three-phase high-voltage output reactor volume, have practiced thrift design cost greatly, can detect every looks low-voltage output reactor trouble alone when the reactor breaks down, the reliability is high and can realize effectively suppressing impulse current and protection system safety.
A high-voltage frequency conversion soft starting device adopting a single-phase low-voltage output reactor configuration comprises a power grid
A high-voltage AC motor M, a high-voltage frequency converter N, and three contactors
Low voltage output reactor
. Contactor with a magnetic circuit having a magnetic core
One end connected to the power grid
One end of the N-shaped magnetic core is connected with the input side of the frequency converter N; contactor with a magnetic circuit having a magnetic core
One end connected to the power grid
One end of the high-voltage alternating current motor M is connected with the power supply;
one end is connected with the output side of the high-voltage frequency converter N, and the other end is connected with the high-voltage alternating current motor M.
Further, high-voltage inverter N, its characterized in that: the high-voltage frequency converter N belongs to a unit series connection three-phase multi-level topological structure, and each phase is connected in series
A power unit and a single-phase low-voltage output reactor.
Further, by the contactor
The switching on and off of the soft starting device realizes the smooth switching between the frequency conversion and the power frequency of the soft starting device,
and
when the high-voltage frequency converter N is closed, the high-voltage alternating current motor M is dragged to a power grid after the high-voltage frequency converter N is powered on to work
Frequency of high-voltage ac motor M, current phase and grid
When the phases of (a) and (b) are identical,
closed, after the system is stably operated for a period of time,
and (4) disconnecting.
Drawings
The invention will be described in further detail with reference to the accompanying drawings:
fig. 1 is a schematic diagram of a high-voltage variable-frequency soft starting device configured by a single-phase low-voltage output reactor provided by the present invention;
fig. 2 is the utility model provides a novel single-phase low voltage output reactor schematic diagram.
Detailed Description
The following description is merely a preferred embodiment of the present invention. The invention is further described in detail in the following with reference to the drawings and the detailed description so as to enable those skilled in the art to understand the invention, it should be noted that all the inventions utilizing the inventive concept can be protected by the ordinary skilled in the art without departing from the principle of the invention as long as the various changes are within the spirit and scope of the invention defined and determined by the appended claims.
Fig. 1 is the utility model provides an adopt the high-pressure frequency conversion soft starting device schematic diagram of single-phase low-voltage output reactor configuration. As shown in figure 1, the high-voltage frequency conversion soft starting device adopting the single-phase low-voltage output reactor configuration comprises a power gridV in A high-voltage AC motor M, a high-voltage frequency converter N, and three contactors K 1 ，K 2 ，K 3 Low voltage output reactorL 1 ，L 2 ，L 3 (ii) a Contactor K 1 One end and the power gridV in One end of the frequency converter is connected with the input side of the frequency converter N; contactor K 2 One end connected to the power gridV in One end of the high-voltage alternating current motor M is connected with the power supply; k 3 One end is connected with the output side of the high-voltage frequency converter N, and the other end is connected with the high-voltage alternating current motor M. The high-voltage frequency converter N belongs to a unit series connection three-phase multi-level topological structure, and each phase is connected in seriesnA power unit and a low-voltage output reactor.
When the high-voltage frequency conversion soft starting device enters a working state, the contactor K is controlled 1 ，K 2 ，K 3 Realizing the smooth switching between the frequency conversion and the power frequency of the soft starting device, firstly closing K 1 And K 3 N drives the high-voltage alternating current motor M to be dragged to the power gridVin frequency, when the phase, amplitude and frequency of the current of the high-voltage alternating current motor M are equal to those of the power gridV in When consistent, close K 2 Switching from frequency conversion to power frequency operation; when the motor runs stably, K is switched off 3 And bypassing the variable-frequency high-voltage soft start device.
In the process, in order to prevent overcurrent faults from occurring when the power frequency is switched, the unit modules are damaged and the electric reactor is adopted to limit the power grid sideV in The traditional three-phase reactor is connected between a unit series multi-level high-voltage frequency converter N and a high-voltage alternating current motor M, needs to bear extremely high voltage value, and has huge corresponding volume. The utility model provides a single-phase low pressure output reactor connects by unit series connection multilevel high-voltage inverter N internal power unit, and the power electronic component that only needs to bear the magnitude of voltage that single power unit bore can protect the converter does not receive the damage, and the reduction of withstand voltage also makes the volume of reactor reduce greatly, practices thrift the cost.
Fig. 2 is a schematic diagram of the novel single-phase low-voltage output reactor provided by the invention. The high-voltage alternating current motor and the converter of example 10KV export in order to illustrate the utility model provides a novel withstand voltage ability of single-phase low pressure output reactor, when the multi-level high-voltage frequency converter N of unit series connection exports 10 KV's voltage, totally 8 power cells, power cell output 690V voltage, every looks output 10KV voltage, as shown in fig. 2, reactor outputL 1 And the last power unit A of U phase 8 Series reactorL 2 And the last power unit B of the V phase 8 Series reactorL 3 And W phase last power unit C 8 Series connection, when the system begins to switch power frequency by frequency conversion, K 2 Has been closed and K 1 、K 3 The single-phase low-voltage output reactor of each phase only bears a 690V voltage value without being turned off, and compared with 10KV, the withstand voltage value of the reactor is greatly reduced, so that the volume of the reactor of each phase is reduced, the cost is saved, the current mutation is inhibited, the system safety is protected, and the power factor is improved.
While the present invention has been described in detail and with reference to the accompanying drawings, it is not to be considered as limited to the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (3)
1. A high-voltage frequency conversion soft starting device adopting a single-phase low-voltage output reactor configuration comprises a power grid
A high-voltage AC motor M, a high-voltage frequency converter N, and three contactors
Low voltage output reactor
The method is characterized in that: contactor with a magnetic circuit having a magnetic core
One end connected to the power grid
One end of the N-shaped magnetic core is connected with the input side of the frequency converter N; contactor with a magnetic circuit having a magnetic core
One end and the power grid
One end of the high-voltage alternating current motor M is connected with the power supply;
one end of the high-voltage AC motor is connected with the N output side of the high-voltage frequency converter, and the other end of the high-voltage AC motor is connected with the N output side of the high-voltage frequency converterM。
2. The high-voltage frequency conversion soft starting device configured by the single-phase low-voltage output reactor according to claim 1, wherein: the high-voltage frequency converter N belongs to a unit series connection three-phase multi-level topological structure, and each phase is connected in series
A power unit and a low-voltage output reactor.
3. The high-voltage frequency conversion soft starting device configured by the single-phase low-voltage output reactor according to claim 1, wherein: the contactor
The soft starting device is used for realizing smooth switching between frequency conversion and power frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222627242.6U CN218301253U (en) | 2022-10-08 | 2022-10-08 | High-voltage frequency conversion soft starting device configured by single-phase low-voltage output reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222627242.6U CN218301253U (en) | 2022-10-08 | 2022-10-08 | High-voltage frequency conversion soft starting device configured by single-phase low-voltage output reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218301253U true CN218301253U (en) | 2023-01-13 |
Family
ID=84804545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222627242.6U Active CN218301253U (en) | 2022-10-08 | 2022-10-08 | High-voltage frequency conversion soft starting device configured by single-phase low-voltage output reactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218301253U (en) |
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2022
- 2022-10-08 CN CN202222627242.6U patent/CN218301253U/en active Active
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