CN217307558U - ACD three-level frequency converter with online backup phase module - Google Patents
ACD three-level frequency converter with online backup phase module Download PDFInfo
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- CN217307558U CN217307558U CN202220708300.5U CN202220708300U CN217307558U CN 217307558 U CN217307558 U CN 217307558U CN 202220708300 U CN202220708300 U CN 202220708300U CN 217307558 U CN217307558 U CN 217307558U
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Abstract
The utility model belongs to the control technology of a medium-low voltage frequency converter, and provides an ACD three-level frequency converter with an online backup phase module, which comprises at least seven phase modules; wherein three phase modules form a rectifier bridge, three phase modules form an inverter bridge, and at least one phase module is used as an online backup phase module for replacing the rectifier bridge or the inverter bridge; the phase module consists of a phase main loop and a phase trigger; phase main loop mainIGBT to be connected in series by upper bridge arm 1 、IGBT 2 IGBT with lower bridge arm connected in series 3 And IGBT 4 And two clamping diodes Z 1 、Z 2 The assembly is fastened on a radiator and is packaged in a drawer or an assembly which can be movably disassembled and assembled together with a phase trigger; the utility model discloses shortened ACD three-level converter because of the accident repair time has improved production efficiency and has reduced risk and the potential safety hazard brought because of the accident, has certain society and economic benefits and is showing.
Description
Technical Field
The invention belongs to the control technology of a medium-low voltage frequency converter, and provides an ACD (alternating current drive) three-level frequency converter with an online backup phase module, wherein the ACD is short for AC Drivers (alternating current drive or alternating current multi-drive). The medium and low voltage generally refers to a voltage level of 3.3kV and below, including 0.66kV, 1.14kV, 2.3kV and the like.
Background
Some mechanical equipment, such as mine hoists, blast furnace burden hoists, large and medium belt conveyors, large and medium mine ventilators, etc., require no stoppages in the middle or possibly short stoppages. In the traditional three-level frequency converter, a power device IGBT is assembled on one or two radiators to form a three-phase rectifier bridge and a three-phase inverter bridge. Due to overvoltage, overcurrent and the like, the power device IGBT and the like are relatively weak, and the probability of failure or damage is high. If the frequency converter fails in the using process, a failure point is searched and determined, the frequency converter is repaired by replacing a damaged component and put into use again, so that the shutdown time is long or uncertain due to the failure, and the production efficiency and the personal safety are influenced; if the damaged components are in shortage of spare parts, or the off-line storage of spare parts is poor or the environment causes the characteristic of the spare parts to be reduced, the down time is longer. For example, a mine hoist for transporting personnel is stopped in the midway due to reasons, passengers in a hoisting container are trapped in the middle of a shaft, the passengers are detained for a long time, the emotion of the passengers can be agitated, and the potential safety hazard is increased along with the stop time; as another example, a mine ventilation system with high gas may cause gas bursts if it is shut down for a long period of time, which may directly threaten the life safety of personnel in the area.
The modular design and packaging of phase medium power devices are also performed by individual traditional three-level frequency converters, but the modules are off-line backup, the performance of the backup modules cannot be guaranteed due to the limitation of conditions such as storage and test, the condition that the backup modules are not good is often found when the conditions occur, and the repair time of the frequency converters is delayed.
Disclosure of Invention
In order to overcome the shortcoming that the repair time of the traditional three-level frequency converter is uncertain due to reasons, the utility model provides an ACD three-level frequency converter with online backup phase module.
The utility model adopts the following technical proposal to complete the purpose of the invention:
an ACD three-level frequency converter with an online backup phase module is provided with a phase module which is used as a basic power unit to carry out modular design, encapsulation and interface; the phase module is at least seven: once a phase module of the rectifier bridge or the inverter bridge fails, the backup phase module replaces the failed phase module, and the ACD three-level frequency converter can recover to operate in the shortest time; the failed phase module is withdrawn and maintained off line, and the failed phase module is used as a backup phase module to restore the online standby operation in time after being repaired qualified, and is recycled; the phase module consists of a phase main loop and a phase trigger and is used as a basic power unit which can be replaced mutually; the phase main loop is mainly formed by connecting IGBTs (insulated gate bipolar transistors) in series by upper bridge arms 1 、IGBT 2 IGBT with lower bridge arm connected in series 3 And IGBT 4 And two clamping diodes Z 1 、Z 2 The assembly is fastened on a radiator and is packaged in a drawer or an assembly which can be movably disassembled and assembled together with the phase trigger; in the phase main loop, four IGBTs are connected in series in turn according to an emitting electrode and a collecting electrode, and two clamping diodes Z 1 And Z 2 In an anode-cathode series, Z 1 And the IGBT of the upper bridge arm 1 Emitter electrode of (1), IGBT 2 Are connected together at the collector electrodes, Z 2 And the IGBT of the lower bridge arm 3 Emitter electrode of (1), IGBT 4 Are connected together to form a typical diode neutral point clamped three-level circuit; the phase main loop forms four power terminals: "+ E, -E, 0", are: the upper bridge arm IGBT 1 The collector outlet terminal is + E', IGBT 2 And the lower bridge arm IGBT 3 Set of (1)The leading-out terminal is "-", the lower bridge arm IGBT 4 The outlet terminal of the emitter is '-E', and two clamping diodes Z 1 And Z 2 The cathode of the capacitor is connected in series, and then the outlet terminal is 0; the trigger signal lines of the phase trigger are respectively connected to the upper bridge arm IGBT 1 、IGBT 2 And lower bridge arm IGBT 3 、IGBT 4 The grid electrode provides trigger signals for the IGBT.
The rectifier bridge consists of three phase modules and a rectifier bridge controller, and the minus terminals of the three phase main circuits are respectively connected with three input terminals on the network side through busbars or power cables to form three input ends of the ACD three-level frequency converter; and connecting the optical fiber ports of the three corresponding phase triggers with the optical fiber port of the rectifier bridge controller through optical fibers, wherein the phase triggers receive control signals from the rectifier bridge controller and transmit the operating parameters of the rectifier bridge, including fault information, to the rectifier bridge controller, so that the safe operation of the rectifier bridge is ensured.
Similarly, the inverter bridge consists of three phase modules and an inverter bridge controller, and the "-" terminals of the three phase main circuits are respectively connected with three output terminals on the motor side through busbars or power cables to form three output ends of the ACD three-level frequency converter; and connecting the optical fiber ports of the three corresponding phase triggers with the optical fiber port of the inverter bridge controller through optical fibers, wherein the phase triggers receive control signals from the inverter bridge controller and transmit the operation parameters of the inverter bridge, including fault information, to the rectifier bridge controller, so that the safe operation of the rectifier bridge is ensured.
The number of the online backup phase modules is at least one, the + E, the-E and the 0 are three poles of a laminated busbar, and the rectifier bridge and the inverter bridge are connected with the + E, the-E and the 0 three poles of the online backup phase module through the laminated busbar to form the + E, the-E and the 0 three poles of the direct current busbar of the ACD three-level frequency converter with the online backup phase module, so that the backup phase module can be in an online standby state.
The online backup phase main loop terminals "-", "0" and the optical fiber ports of the phase trigger are all in idle states, and the online backup phase module is ensured to be in an online standby state in the operation process of the ACD three-level frequency converter with the online backup phase module, so that the capability of replacing a fault phase module at any time is realized.
Once the phase module in the rectifier bridge or the inverter bridge has a fault, replacing the fault phase module with the backup phase module in a power failure state, and removing and maintaining the fault phase module off line; and after the failed phase module is repaired to be qualified, the failed phase module is used as a backup phase module, the online operation is recovered, and the failed phase module is repeated and recycled, so that the ACD three-level frequency converter is ensured to be in a good state and is often provided with the online backup phase module.
The four power terminals "+ E, 0" of the phase main loop are quick plug-in terminals or quick dismounting fasteners, so that the phase module is convenient and quick to dismount.
The radiator is an air cooling radiator and a water cooling plate.
The utility model provides a three level converters of ACD with online backup looks module carries out modular design, encapsulation and interface as basic power unit according to the looks module, online backup at least one looks module. And once the phase module in the rectifier bridge or the inverter bridge breaks down, the phase module is replaced by a backup phase module in the power failure state. And the fault phase module is maintained off line, and after being repaired qualified, the fault phase module serving as a backup phase module is recovered to operate on line, and the fault phase module is repeated and recycled. The ACD three-level frequency converter has the advantages that the repair time of the ACD three-level frequency converter due to the reasons is shortened, the production efficiency is improved, the risk and the potential safety hazard caused by the reasons are reduced, and certain social and economic benefits are remarkable.
Drawings
Fig. 1 is a schematic diagram of an ACD three-level frequency converter with an online backup phase module;
fig. 2 is a schematic diagram of a diode neutral point clamped ACD three-level phase module.
In the figure: 1. the system comprises a phase module main loop 2, a phase trigger 3, a rectifier bridge controller 4, an inverter bridge controller 5, a rectifier bridge 6, an inverter bridge 7 and an online backup phase module.
Detailed Description
The embodiment of the present invention is explained with reference to the accompanying drawings:
in the figure, the utility model provides an ACD three-level converter with online backup looks module carries out modular design, encapsulation and interface as basic power unit according to the looks module, constitutes the rectifier bridge by three looks module, constitutes the inverter bridge by other three looks module, is equipped with one and more than one looks module simultaneously and regards as online backup. Once a phase module of the rectifier bridge or the inverter bridge has a fault, the backup phase module replaces the fault phase module, the ACD three-level frequency converter can recover to operate in the shortest time, the fault phase module is quitted and maintained off-line, and the fault phase module is used as the backup phase module to recover to operate on-line standby in time after being repaired to be qualified, and is recycled.
The phase module consists of a phase main loop 1 and a phase trigger 2, and is used as a mutually replaceable basic power unit; the phase main loop 1 mainly comprises two IGBTs (IGBT) connected in series by an upper bridge arm 1 And IGBT 2 ) Two IGBTs (IGBT) connected in series with lower bridge arm 3 And IGBT 4 ) And two clamping diodes (Z) 1 And Z 2 ) The assembly is fastened on a radiator and is packaged in a drawer or assembly which can be movably disassembled and assembled together with the phase trigger 2; in the phase main loop 1, four IGBTs are connected in series in turn according to an emitting electrode and a collecting electrode, and two clamping diodes Z 1 And Z 2 In an anode-cathode series, Z 1 And the IGBT of the upper bridge arm 1 Emitter electrode of (1), IGBT 2 Are connected together by a collector, Z 2 And the IGBT of the lower bridge arm 3 Emitter electrode of (1), IGBT 4 Are connected together to form a typical diode neutral point clamped three-level circuit; the phase main loop 1 forms four power terminals: "+ E, -E, 0", are: the upper bridge arm IGBT 1 The collector terminal is“+E”，IGBT 2 And the lower bridge arm IGBT 3 The collector of the lower bridge arm IGBT is connected with a leading-out terminal of "-", and the lower bridge arm IGBT is connected with a leading-out terminal of "-" 4 The emitting electrode outlet terminal is '-E', two clamping diodes Z 1 And Z 2 The cathode of the capacitor is connected in series, and then the outlet terminal is 0. The trigger signal lines of the phase trigger 2 are respectively connected to the upper bridge arm IGBT 1 、IGBT 2 And lower bridge arm IGBT 3 、IGBT 4 The grid electrode provides trigger signals for the IGBT.
The rectifier bridge 5 consists of three phase modules and a rectifier bridge controller 3, and the "-" terminals of the three phase main circuits 1 are respectively connected with three input terminals on the network side through busbars or power cables to form three input ends R, S, T of the ACD three-level frequency converter; and connecting the optical fiber ports of the three corresponding phase triggers with the optical fiber ports r, s and t of the rectifier bridge controller 3 through optical fibers, wherein the phase triggers 2 receive control signals from the rectifier bridge controller 3 and transmit the operation parameters of the rectifier bridge 5 including fault information to the rectifier bridge controller 3, so that the safe operation of the rectifier bridge 5 is ensured.
Similarly, the inverter bridge 6 is composed of three phase modules and an inverter bridge controller 4, and the "-" terminals of the three phase main circuits 1 are respectively connected with three output terminals on the motor side through busbars or power cables to form three output ends U, V, W of the ACD three-level frequency converter; and connecting the corresponding optical fiber ports of the three phase triggers 2 with the optical fiber ports u, v and w of the inverter bridge controller 4 through optical fibers, wherein the phase triggers 2 receive control signals from the inverter bridge controller 4 and transmit the operation parameters of the inverter bridge 6 including fault information to the rectifier bridge controller 4, so that the safe operation of the rectifier bridge 6 is ensured.
The number of the online backup phase modules 7 is at least one, the + E "," -E "and" 0 "are three poles of a laminated busbar, and the rectifier bridge 5 and the inverter bridge 6 and the + E", "-E" and "0" three poles of the online backup phase module 7 are connected together by the laminated busbar to form + E, -E and 0 three poles of the dc busbar of the ACD three-level frequency converter with the online backup phase module, so that the backup phase module 7 can be in an online standby state.
The terminals "-" of the online backup phase main loop 1 and the optical fiber ports of the phase trigger 2 are in idle states, and the online backup phase module 7 is ensured to be in an online standby state in the operation process of the ACD three-level frequency converter with the online backup phase module, so that the capability of replacing a fault phase module at any time is achieved.
Once the phase module in the rectifier bridge 5 or the inverter bridge 6 has a fault, the online backup phase module 7 is used for replacing the fault phase module in a power failure state, and the fault phase module is removed and maintained offline; and after the failed phase module is repaired to be qualified, the failed phase module is used as a backup phase module, the online operation is recovered, and the module is repeatedly and circularly used, so that the ACD three-level frequency converter is ensured to be in a good state and is often provided with the online backup phase module 7.
The four power terminals "+ E, 0" of the phase main loop 1 are quick plug-in terminals or quick dismounting fasteners, so that the phase module is convenient and quick to dismount.
The radiator is an air cooling radiator and a water cooling plate.
The above only be the utility model discloses a preferred embodiment, the utility model discloses a protection scope is not limited to here, and is any based on the utility model discloses equivalent transform on the technical scheme all belongs to within the protection scope.
Claims (4)
1. An ACD three-level frequency converter with an online backup phase module is characterized in that: the ACD three-level frequency converter is provided with a phase module which is used as a basic power unit to carry out modular design, packaging and interface; the phase module is at least seven: wherein three phase modules form a rectifier bridge, three phase modules form an inverter bridge, and at least one phase module is used as an online backup phase module for replacing the rectifier bridge or the inverter bridge; the phase module consists of a phase main loop and a phase trigger and is used as a mutually replaceable basic power unit; the phase main loop is mainly formed by connecting IGBTs (insulated gate bipolar transistors) in series by upper bridge arms 1 、IGBT 2 IGBT with lower bridge arm connected in series 3 And IGBT 4 And two clamping diodes Z 1 、Z 2 The assembly is fastened on a radiator and is packaged in a drawer or an assembly which can be movably disassembled and assembled together with the phase trigger; in the phase main loop, four IGBTs are connected in series in turn according to an emitting electrode and a collecting electrode, and two clamping diodes Z 1 And Z 2 In an anode-cathode series, Z 1 And the IGBT of the upper bridge arm 1 Emitter electrode of (1), IGBT 2 Are connected together at the collector electrodes, Z 2 And the IGBT of the lower bridge arm 3 Emitter electrode of (1), IGBT 4 Are connected together to form a typical diode neutral point clamped three-level circuit; the phase main loop forms four power terminals: "+ E, -E, 0", are: the upper bridge arm IGBT 1 The collector outlet terminal is + E', IGBT 2 And the lower bridge arm IGBT 3 The collector of the lower bridge arm IGBT is connected with a leading-out terminal of "-", and the lower bridge arm IGBT is connected with a leading-out terminal of "-" 4 The emitting electrode outlet terminal is '-E', two clamping diodes Z 1 And Z 2 The cathode of the capacitor is connected in series, and then the outlet terminal is 0; the trigger signal lines of the phase trigger are respectively connected to the upper bridge arm IGBT 1 、IGBT 2 And a lower arm IGBT 3 、IGBT 4 The grid electrode provides trigger signals for the IGBT.
2. The ACD three-level frequency converter with an online backup phase module according to claim 1, wherein: at least one online backup phase module is provided; connecting three poles of + E, E and 0 of the rectifier bridge, the inverter bridge and the online backup phase module together through a laminated busbar to form three poles of + E, E and 0 of a direct current busbar of the ACD three-level frequency converter with the online backup phase module; and the terminal "-" of the online backup phase module and the optical fiber port of the phase trigger are both in idle states, and the backup phase module is always in an online standby state.
3. The ACD three-level frequency converter with an online backup phase module according to claim 1 or 2, wherein: the four power terminals "+ E, 0" of the phase main loop are quick plug-in terminals or quick dismounting fasteners.
4. The ACD three-level frequency converter with an online backup phase module according to claim 1, wherein: the radiator is an air cooling radiator and a water cooling plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220708300.5U CN217307558U (en) | 2022-03-30 | 2022-03-30 | ACD three-level frequency converter with online backup phase module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220708300.5U CN217307558U (en) | 2022-03-30 | 2022-03-30 | ACD three-level frequency converter with online backup phase module |
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| CN217307558U true CN217307558U (en) | 2022-08-26 |
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| CN202220708300.5U Active CN217307558U (en) | 2022-03-30 | 2022-03-30 | ACD three-level frequency converter with online backup phase module |
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