CN201051720Y - Power unit bypass machine of high-voltage frequency conversion speed-adjusting device - Google Patents
Power unit bypass machine of high-voltage frequency conversion speed-adjusting device Download PDFInfo
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- CN201051720Y CN201051720Y CNU2007200707357U CN200720070735U CN201051720Y CN 201051720 Y CN201051720 Y CN 201051720Y CN U2007200707357 U CNU2007200707357 U CN U2007200707357U CN 200720070735 U CN200720070735 U CN 200720070735U CN 201051720 Y CN201051720 Y CN 201051720Y
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Abstract
The utility model relates to a power unit by-pass mechanism of a high-voltage frequency conversion speed regulation device, which comprises each intelligent power unit inverter which is connected in parallel on the high-voltage frequency conversion speed regulation device, a gate circuit transistor module at the two ends of an alternating bus wire, and a switch blade mechanism which is mechanically operated. The utility model is characterized in that an absorption return circuit for absorbing dv/dt is arranged between each intelligent power unit inverter and the gate circuit transistor module at the two ends of the alternating bus wire. The utility model has the advantages that the intelligent power unit which is broken down can be on-line changed in the circuit, the cost is low, the power consumption is low, and the working is reliable.
Description
Technical field
The utility model relates to a kind of power unit bypass machine of high-voltage frequency conversion and speed-adjusting device, relates in particular to a kind of power unit bypass machine that adopts the high-voltage frequency conversion and speed-adjusting device behind the units in series multiple technology, belongs to the high-voltage frequency conversion and speed-adjusting device technical field.
Background technology
In recent years, development along with power electronic technology, impelled the development of power electronic device, insulated gate bipolar transistor IGBT was developed rapidly in the nineties, its good insulation preformance, degree of modularity height, operating frequency can reach 20kHz, has therefore obtained using widely on the low-voltage variable frequency speed regulating device.In high-voltage frequency conversion and speed-adjusting,,, can't satisfy the electric pressure of direct use though can accomplish 3.3～4.5Kv at present because the operating voltage of IGBT is low.Adopt the units in series multiple technology so people's design studies goes out in high-voltage frequency conversion and speed-adjusting device, make to meet IGBT module use, that operating voltage is lower and be applied.The autonomous independent 6KV high-voltage frequency conversion and speed-adjusting device of developing of applicant, through too much giving the power supply of intelligent power unit after the step-down of winding phase-shifting rectifier transformer, the intelligent power unit is the AC-DC-AC PWM voltage source inverter structure that three-phase is imported single-phase output, the output of adjacent intelligent power unit is together in series, form Y shape structure, the high pressure of realization variable voltage variable frequency is directly exported, and supplies with high-tension motor.
This high-voltage frequency conversion and speed-adjusting device in use; in the time of can occurring one or several IGBT module once in a while and break down; cause the fault of intelligent power unit; in order to make high-voltage frequency conversion and speed-adjusting device can also continue operate as normal; do not influence the operation of whole system; should be as soon as possible the intelligent power unit of fault is withdrawed from and can carry out online replacing under non-stop-machine situation, this just needs the requirement more than satisfying of a kind of protective circuit and mechanism
The electronics bypass circuit that uses in the present domestic high-voltage frequency conversion and speed-adjusting device, no physics bypass mechanism and can not onlinely changing could be changed trouble unit after can only shutting down, and mainly contains several:
1 constitutes bypass circuit by relay or contactor, and its shortcoming is: because the mechanical contact loose contact sometimes of relay or contactor or move inaccurately, action has the time limit, influences reliability of system operation;
The bypass circuit of the 2 another kind of forms that generally adopt now as shown in Figure 1, it is made of single-phase diode rectifier bridge 2 that is arranged on inverter bridge 1 next door and thyristor 3.When certain power model broke down, inverter bridge 1 was turn-offed by system, triggered thyristor 3, and electric current is flow through by the path that diode rectifier bridge 2 and thyristor 3 form.But this bypass circuit exists certain problem in actual applications, and this is because whole circuit has proposed higher requirement to diode in the bypass circuit and thyristor.As everyone knows, the switching time of IGBT is very short, generally about 300nS, use the IGBT of 1700V now, DC bus-bar voltage can reach about 1000V, so during the IGBT switch dv/dt that produces can be reached the magnitude of 3000V/ μ S, and the dv/dt that thyristor can bear is generally below 1000V/ μ S.So circuit shown in Figure 1, when just powering on, the voltage at thyristor two ends is zero, and when power model IGBT begins moment of normally, thyristor will tolerate the dv/dt above its tolerance.So just cause misleading of thyristor easily, cause the inverter bridge output short-circuit, thereby power model is broken down;
3 to also have a kind of be to have increased a pre-charge circuit 4 on above-mentioned the 2nd kind bypass circuit basis, as shown in Figure 2, though solved some defectives of above-mentioned the 2nd kind of bypass circuit, but can not solve the online replacing of this fault power modular unit, and the components and parts that the mode of this bypass circuit is used are many, circuit is relatively complicated.
Summary of the invention
The purpose of this utility model is to provide a kind of intelligent power unit that makes fault can online replacing in circuit, and cost is low, low in energy consumption, the power unit bypass machine of the high-voltage frequency conversion and speed-adjusting device of reliable operation.
For realizing above purpose, the technical solution of the utility model provides a kind of power unit bypass machine of high-voltage frequency conversion and speed-adjusting device, comprise the mechanically operated plug-in strip of thyristor module that each intelligent power unit inverter of being connected in parallel on high-voltage frequency conversion and speed-adjusting device, ac bus output two ends are other and mechanism, it is characterized in that, between a thyristor module on each intelligent power unit inverter and side, ac bus output two ends, be provided with the absorption circuit that absorbs dv/dt.
Described thyristor module is the thyristor module of forward and reverse parallel connection.
The absorption circuit of described dv/dt is made up of radio-frequency rector, absorption electric capacity and absorption resistance, the inverter that radio-frequency rector L is serially connected in the output of each intelligent power unit of RHVC exchanges between end and the output AC bus end, the absorption electric capacity and the absorption resistance of a serial connection in parallel between output AC bus two ends, between output AC bus two ends with a forward and reverse thyristor module parallel connection in parallel.
The utility model is provided with the absorption circuit that absorbs dv/dt between a thyristor module on each intelligent power unit inverter and side, ac bus output two ends; the high dv/dt that produces when the igbt switch motion; because radio-frequency rector has been arranged; the high dv/dt that produces is suppressed to very low when absorbing electric capacity and absorption resistance with the igbt switch motion; make the thyristor module forward and reverse in parallel in the electronics bypass can not bear too high dv/dt; the also situation that can not make forward and reverse thyristor module in parallel occur misleading; thereby the assurance system is reliable electronics bypass during in fault in certain intelligent power unit; make system can under the operating mode of a certain qualification, continue operation simultaneously; wait for that the maintenance personal is ready to spare part; with the intelligent power unit of fault is online withdrawing under non-stop-machine situation; the spare part that more renews; withdraw from the physics bypass mechanism; new spare part drops into automatically, and system recovers operate as normal automatically.
The absorption circuit b of dv/dt of the present utility model not only absorbs the dv/dt that inverter produces, and protects forward and reverse thyristor module in parallel, and the output waveform of inverter is carried out filtering, makes harmful harmonic wave obtain good restraining.The output-index of high-voltage frequency conversion and speed-adjusting device is improved greatly like this;
The utility model has the advantages that the intelligent power unit that makes fault can online replacing in circuit, cost is low, low in energy consumption, reliable operation.
Description of drawings
Fig. 1 is electronics bypass circuit figure of the prior art;
Fig. 2 is another kind of electronics bypass circuit figure of the prior art;
Fig. 3 is the power unit bypass machine circuit diagram of high-voltage frequency conversion and speed-adjusting device;
Fig. 4 is the power unit bypass machine structural representation of high-voltage frequency conversion and speed-adjusting device.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 3, power unit bypass machine circuit diagram for high-voltage frequency conversion and speed-adjusting device, the power unit bypass machine of described a kind of high-voltage frequency conversion and speed-adjusting device is by each the intelligent power unit inverter 1 that is connected in parallel on high-voltage frequency conversion and speed-adjusting device, an other thyristor module 5 of ac bus output two ends, absorbing the mechanically operated plug-in strip of the absorption circuit 6 of dv/dt and mechanism 7 forms, described thyristor module 5 is the thyristor module of forward and reverse parallel connection, is provided with the absorption circuit 6 that absorbs dv/dt between a thyristor module 5 on each intelligent power unit inverter 1 and side, ac bus output two ends.
The absorption circuit 6 of described dv/dt is by radio-frequency rector L, absorbing capacitor C and absorption resistance R forms, wherein the end of radio-frequency rector L is serially connected in each intelligent power unit inversion 1 of high-voltage frequency conversion and speed-adjusting device and exchanges outlet side, the other end that is connected in parallel on radio-frequency rector L after absorbing capacitor C and absorption resistance R connecting exchanges the opposite side of output with intelligent power unit inverter 1, forward and reverse thyristor module in parallel 5 is connected in parallel on the two ends after absorption capacitor C and the absorption resistance R series connection, plug-in strip mechanism 7 is connected in parallel on the two ends of forward and reverse thyristor module in parallel 5, absorb (inhibition) dv/dt loop 6 like this, can make igbt in the intelligent power unit inversion 1 in switch moment, the dv/dt that avoids forward and reverse thyristor module in parallel 5 tolerances not tolerate, and cause misleading of forward and reverse thyristor module in parallel 6.Forward and reverse thyristor module in parallel 5 is when a certain intelligent power of high-voltage frequency conversion and speed-adjusting device unit inverter 1 breaks down; receive the trigger command of the controller in the intelligent power unit; make all conductings of thyristor forward and reverse in parallel in forward and reverse thyristor module in parallel 5; the output of the order locking intelligent power unit inverter 1 of controller simultaneously; the intelligent power unit inverter 1 that has played the high-voltage frequency conversion and speed-adjusting device fault carries out bypass; thereby the assurance system can continue operation under the operating mode of a certain qualification, waits for that the maintenance personal changes under non-stop-machine situation.
As shown in Figure 4, power unit bypass machine structural representation for high-voltage frequency conversion and speed-adjusting device, described plug-in strip mechanism 7 prolongs pull bar 9, plug-in strip 11, plug-in strip fixing closed mouthful 12 and casing 14 by operating grip 8, insulation and forms, insulation prolongs the front and back side that pull bar 9 passes each power cell casing 14, the outer insulation of operating grip 8 connect boxes 14 rear sides prolongs pull bar 9 ends, insulation outside casing 14 front sides prolongs pull bar 9 ends and connects plug-in strip 11, and plug-in strip 11 sides are provided with fixing closed mouthful 12 of plug-in strip.
Intelligent power unit inverter 1, the other thyristor module 5 in ac bus output two ends absorbs the absorption circuit 6 of dv/dt and forms the front side that electronics bypass 15 is installed in casing 14, the ac bus with 1 output of intelligent power unit inverter of plug-in strip 11 connects 13 and is connected, special plug-in strip is fixed on another output AC bus 10 of intelligent power unit inverter 1 for fixing closed mouthful 12, be ready to the laggard line operate of spare part elder generation operating operation handle 8 the maintenance personal, the pulling insulation prolongs pull bar 9, make fixing closed mouthful 12 closures of plug-in strip 11 and plug-in strip, operating current is directly from ac bus 13 plug-in strip 11 of flowing through, flow to next normal intelligent power unit inverter from another output AC bus 10 again, thereby make the thyristor module 5 forward and reverse in parallel in the electronics by-pass line not have electric current to flow through, finished the physics by-pass procedure.Can under non-stop-machine situation, change spare part like this.
Mechanically operated plug-in strip in the utility model is the physics bypass mechanism, and this is a completely new concept, and the present invention has had mechanically operated plug-in strip mechanism 7, can not shut down the replacing trouble unit, thereby the utilance of system is improved greatly.
Claims (4)
1. the power unit bypass machine of a high-voltage frequency conversion and speed-adjusting device, comprise each the intelligent power unit inverter (1), an other thyristor module (5) and the mechanically operated plug-in strip mechanism (7) in ac bus output two ends that are connected in parallel on high-voltage frequency conversion and speed-adjusting device, it is characterized in that, between a thyristor module (5) on each intelligent power unit inverter (1) and side, ac bus output two ends, be provided with the absorption circuit (6) that absorbs dv/dt.
2. the power unit bypass machine of high-voltage frequency conversion and speed-adjusting device according to claim 1 is characterized in that, described thyristor module (5) is the thyristor module of forward and reverse parallel connection.
3. the power unit bypass machine of high-voltage frequency conversion and speed-adjusting device according to claim 1, it is characterized in that, the absorption circuit of described dv/dt (6) is made up of radio-frequency rector L, absorption capacitor C and absorption resistance R, the inverter (1) that radio-frequency rector L is serially connected in the output of each intelligent power unit of RHVC exchanges between end and the output AC bus end, in parallel one absorption capacitor C and the absorption resistance R that is connected in series between output AC bus two ends; Between output AC bus two ends with a forward and reverse thyristor module in parallel (6) parallel connection.
4. the power unit bypass machine of high-voltage frequency conversion and speed-adjusting device according to claim 1, it is characterized in that, described plug-in strip mechanism (7) is by operating grip (8), insulation prolongs pull bar (9), plug-in strip (11), plug-in strip fixing closed mouthful (12) and casing (14) are formed, insulation prolongs the front and back side that pull bar (9) passes each power cell casing (14), the outer insulation of operating grip (8) connect box (14) rear side prolongs pull bar (9) end, insulation outside casing (14) front side prolongs pull bar (9) end and connects plug-in strip (11), and plug-in strip (11) side is provided with plug-in strip fixing closed mouthful (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200707357U CN201051720Y (en) | 2007-06-07 | 2007-06-07 | Power unit bypass machine of high-voltage frequency conversion speed-adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200707357U CN201051720Y (en) | 2007-06-07 | 2007-06-07 | Power unit bypass machine of high-voltage frequency conversion speed-adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201051720Y true CN201051720Y (en) | 2008-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200707357U Expired - Lifetime CN201051720Y (en) | 2007-06-07 | 2007-06-07 | Power unit bypass machine of high-voltage frequency conversion speed-adjusting device |
Country Status (1)
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| CN (1) | CN201051720Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841158A (en) * | 2010-04-09 | 2010-09-22 | 上海电气集团股份有限公司 | 10kV dynamic voltage restorer based on cascade of power units |
| CN102780224A (en) * | 2012-08-08 | 2012-11-14 | 西安交通大学 | Seamless cut-off controlling method for chained multi-level inverter error unit |
| CN105186475A (en) * | 2015-08-28 | 2015-12-23 | 中国神华能源股份有限公司 | Bypass unit, bypass device and subsynchronous oscillation suppression system |
| CN106100404A (en) * | 2016-06-07 | 2016-11-09 | 南方电网科学研究院有限责任公司 | Modular multilevel converter and use method thereof |
| CN106329978A (en) * | 2016-09-28 | 2017-01-11 | 南京比恩机电科技有限公司 | Distributed structure and control method of high voltage and high frequency electrostatic precipitation power supply inverting circuit |
| CN112886536A (en) * | 2021-01-14 | 2021-06-01 | 济南海林科技有限公司 | Voltage transformation system with instantaneous quick-break protection function and quick-break protection method thereof |
-
2007
- 2007-06-07 CN CNU2007200707357U patent/CN201051720Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841158A (en) * | 2010-04-09 | 2010-09-22 | 上海电气集团股份有限公司 | 10kV dynamic voltage restorer based on cascade of power units |
| CN102780224A (en) * | 2012-08-08 | 2012-11-14 | 西安交通大学 | Seamless cut-off controlling method for chained multi-level inverter error unit |
| CN102780224B (en) * | 2012-08-08 | 2014-04-23 | 西安交通大学 | Seamless cut-off controlling method for chained multi-level inverter error unit |
| CN105186475A (en) * | 2015-08-28 | 2015-12-23 | 中国神华能源股份有限公司 | Bypass unit, bypass device and subsynchronous oscillation suppression system |
| CN106100404A (en) * | 2016-06-07 | 2016-11-09 | 南方电网科学研究院有限责任公司 | Modular multilevel converter and use method thereof |
| CN106329978A (en) * | 2016-09-28 | 2017-01-11 | 南京比恩机电科技有限公司 | Distributed structure and control method of high voltage and high frequency electrostatic precipitation power supply inverting circuit |
| CN112886536A (en) * | 2021-01-14 | 2021-06-01 | 济南海林科技有限公司 | Voltage transformation system with instantaneous quick-break protection function and quick-break protection method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20080423 Effective date of abandoning: 20070607 |
|
| RGAV | Abandon patent right to avoid regrant |