CN201629677U - Pre-charging circuit for high-voltage frequency converter using high-voltage technology - Google Patents

Pre-charging circuit for high-voltage frequency converter using high-voltage technology Download PDF

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Publication number
CN201629677U
CN201629677U CN2010201534573U CN201020153457U CN201629677U CN 201629677 U CN201629677 U CN 201629677U CN 2010201534573 U CN2010201534573 U CN 2010201534573U CN 201020153457 U CN201020153457 U CN 201020153457U CN 201629677 U CN201629677 U CN 201629677U
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China
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voltage
transformer
winding
switch
kmy
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CN2010201534573U
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Chinese (zh)
Inventor
任志远
施明贤
毕明新
田洪平
杜刚强
宋卫东
朱卫东
于广
李艳萍
赵建伟
栾晓亮
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东方电子股份有限公司
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Publication of CN201629677U publication Critical patent/CN201629677U/en

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Abstract

The utility model relates to a pre-charging circuit for a high-voltage frequency converter using the high-voltage technology, comprising a transformer TM which is connected with a high-voltage switch QF and a high-voltage power supply, also comprising a low-voltage pre-charging circuit which comprises a 380V auxiliary winding connected at the secondary side of the transformer TM, the input end of the 380V auxiliary winding is connected in series in a pre-charging control switch KMY and three pre-charging power resistors and is connected with the input of the three-phase 380V; a node DO1 of a main controller or a PLC is connected with an auxiliary node of the pre-charging control switch KMY in series and is then connected with a control winding of the high-voltage switch QF; and a node DO2 of the main controller or the PLC is connected with an auxiliary node of the high-voltage switch QF in series and is then connected with a control winding of the pre-charging control switch KMY. The utility model reduces the impact to a system busbar under the condition of switching on the high-voltage switch of the frequency converter and meets the normal function debugging of the system without the high-voltage power supply.

Description

Utilize low-voltage technology to carry out the high voltage converter pre-charge circuit

Technical field the utility model relates to a kind of high voltage converter pre-charge circuit, specifically, is that a kind of low-voltage technology that utilizes carries out precharge circuit to high voltage converter.

Background technology is in the high voltage converter system; because it is very big to close input high-voltage electric switch moment transformer excitation flow; wherein peak-peak can reach the transformer rated current 6-8 doubly; transformer secondary winding connects behind the power cell process rectification circuit and connects electric capacity in addition; these electric capacity are equivalent to instantaneous short circuit when system start-up; can cause very big load current; when magnetizing inrush current and load starting current change setting value greater than line protective devices; when especially many high voltage converters start simultaneously; because the stack of current peak; impact very big to bus; can cause the malfunction of switch protection when serious; influence the startup of frequency converter, thereby influence normal production status.In addition at engineering site, also do not possess under the condition of high pressure, in order to carry out the high voltage converter System Functional Test under the translator loading condition not, the most high voltage converter system high-voltage switch gear that must close adds high-tension electricity, if do not satisfy the situation of input high pressure, the power cell of high voltage converter system can't obtain the power supply (AC690V or AC720V) of work, so system can't carry out the normal function debugging.

When closing the input high-voltage electric switch in order to reduce the high voltage converter system, because transformer excitation flow and power cell electric capacity that rectifier terminal adds cause the impact to system power, and satisfy the high voltage converter system in the functional test of not importing under the high voltage source situation, the measure that existing frequency converter product is taked is that current limliting precharge is carried out in the high-pressure side when system start-up, when secondary winding side connects capacitance voltage on the power cell and reaches predetermined value, disconnect precharging circuit, high-voltage switch gear again closes.Its circuit theory connects 3 high-power high voltage resistance R and high-voltage switch gear KM11 in high voltage source one side shown in figure (1), carry out precharge in the high-pressure side for high voltage converter HVF.The shortcoming of this method is: a high-voltage switch gear must be arranged but also needs three high-power resistance (three-phase current limliting) in the system.All device performances all will satisfy high pressure requirement (6KV and 10KV), have increased the volume of system on the one hand, have also increased the cost of system on the other hand.

Utility model content technical problem to be solved in the utility model is, provide a kind of low-voltage technology that utilizes to carry out the high voltage converter pre-charge circuit, high voltage converter is carried out precharge, having reduced frequency converter is closing under the situation of high-voltage switch gear, impact to system busbar, satisfying is not having system's normal function debugging under the situation of high voltage source, reduces the volume of system, reduces the cost of system.To overcome the deficiency of available circuit.

The technical solution of the utility model is as follows:

A kind of low-voltage technology that utilizes carries out the high voltage converter pre-charge circuit, comprise transformer TM, transformer TM is connected with high-voltage switch gear QF, high voltage source, it is characterized in that: also comprise a low pressure pre-charge circuit, described low pressure pre-charge circuit comprises the auxiliary winding of the 380V that is connected transformer TM secondary, and the input of the auxiliary winding of 380V seals in precharge control switch KMY and is connected with three precharge power resistance R and with three-phase 380V input; The auxiliary node serial connection of the Control Node DO1 of master controller or PLC, precharge control switch KMY links to each other with the control winding of high-voltage switch gear QF; The auxiliary node serial connection of the Control Node DO2 of master controller or PLC, high-voltage switch gear QF links to each other with the control winding of precharge control switch KMY.

Good effect of the present utility model is: (1), the utility model employing is different from other must pass through the mode of high-voltage switch gear to the precharge method of frequency converter, keep original system constant, remove high-voltage switch gear KM11 and high-power resistance R, output at the frequency converter input transformer increases the auxiliary winding of a 380V, three low pressure and low power resistance and low tension switch, conducting by the control of the Main Control Unit on high voltage converter low tension switch, use anti-incentive measure that precharge is carried out on the former limit of transformer, when the former limit of transformer is set up high pressure and powered on after capacity charge voltage finishes in transformer secondary winding power unit, disconnect the low pressure pre-charge circuit, switch to the high pressure input, finish precharge function.Can save a high-voltage switch gear KM11, reduce system cost, obtain reasonable economic benefit; Save more powerful resistance simultaneously, reduced the volume of system.Because the use of pre-charge circuit, the system of greatly reducing powers on (closing high-voltage switch gear) moment because the bigger instantaneous charging current of the magnetizing inrush current of transformer and a plurality of power cell electric capacity to the impact of high voltage bus, avoids the malfunction of system protection to produce.

(2), this circuit charges to the former limit of transformer with anti-incentive measure, set up high pressure on the former limit of phase shifting transformer, and in the winding of phase shifting transformer secondary induction output, the voltage of secondary winding output is given the power cell power supply of system, satisfying is not having system's normal function debugging under the situation of high voltage source, is very easy to the debugging and the detection of system.

Description of drawings Fig. 1 is the schematic diagram of the high pressure pre-charge circuit of background technology.

Fig. 2 is circuit theory diagrams of the present utility model.

Fig. 3 is the circuit theory diagrams of tandem type power cell of the present utility model.

Embodiment is further described the utility model below in conjunction with the drawings and specific embodiments.

Shown in Fig. 2,3, this circuit comprises transformer TM, and transformer TM is connected with high-voltage switch gear QF, high voltage source.Transformer TM is a dry-type transformer, transformer TM is input as 6KV or 10KV bus (delta connection), secondary is a plurality of extend-triangle connection windings (variable according to the cascade voltage grade), and each winding is output as AC690V or AC720V connects power cell, as the operating voltage of power cell.All power cells of system are the modular organization of standard, can exchange.Secondary at transformer TM increases the auxiliary winding of an AC380V, and winding power is decided according to transformer capacity.Assisting the input of winding to seal in precharge control switch KMY at 380V is connected with three precharge power resistance R and with three-phase 380V input, the control of precharge control switch KMY is finished by the DO node of master controller or PLC, and electric mutual locking between high-voltage switch gear QF and the precharge control switch KMY.The auxiliary contact of precharge control switch KMY closing coil seal in the closing coil loop of high-voltage switch gear QF, the auxiliary contact of high-voltage switch gear QF closing coil seal in the closing coil loop of low pressure pre-charge pressure K switch MY, be precharge control switch KMY when closing high-voltage switch gear QF disconnect, precharge control switch KMY disconnected when high-voltage switch gear QF closed, in order to avoid when high-voltage switch gear QF closes (under the situation of electrification in high voltage), the reverse charge of the auxiliary winding of 380V, perhaps the auxiliary winding of 380V is under the precharge situation, the closure of high-voltage switch gear QF causes the danger of system.

The signal of control coil comes two node signal DO1 and the DO2 of autonomous controller or PLC, and simultaneity factor is also carried out back production with the state of precharge control switch KMY and high-voltage switch gear QF as DI (remote signalling) signal, and carries out logic determines.

Corresponding latching logic is:

If (KMY state=close) then (DO1=0);

If (QF state=close) then (DO2=0);

Therefore system has guaranteed logic blocking relation between two coils from hardware and software, has improved the reliability of system greatly.

The operation principle of pre-charge circuit is as follows:

When precharge control switch KMY closes, three-phase 380V input is through precharge power resistance R and the auxiliary winding of 380V, former limit winding to transformer TM charges, and responds to output voltage simultaneously on a plurality of windings of secondary, powers to the power cell on the corresponding windings.

Owing to adopted the precharge power resistance R, play metering function, so the process electric current to transformer TM charging has obtained better controlled, the charging process of whole system is slowly, has avoided owing to the impact of the big electric capacity instantaneous short circuit electric current on all power cells of powered on moment to system.

After system detects DC bus-bar voltage on the power cell and reaches predetermined value, disconnect precharge control switch KMY, the high-voltage switch gear QF that closes gets final product, and has finished system's pre-charge process.Because the load on the transformer TM secondary winding is a power cell at this moment, the big electric capacity on the power cell is still charged, so can not cause the phenomenon of secondary winding electric capacity instantaneous short circuit when closing high-voltage switch gear QF, has reduced the impact to the system busbar electric current.

In addition under the situation that the system high pressure electricity does not possess, send instruction by master controller or PLC, system enters debugging mode, control control switch KMY closes a floodgate, through the auxiliary winding charging of 380V, make that former limit of transformer TM and secondary are all charged, guaranteed the working power of system power unit, so whole system can enter complete function debugging state.

Adopt low-voltage technology to solve above problem well, and be successfully used in the DF5000 series high voltage frequency converter in conjunction with control circuit.

Claims (1)

1. one kind is utilized low-voltage technology to carry out the high voltage converter pre-charge circuit, comprise transformer TM, transformer TM is connected with high-voltage switch gear QF, high voltage source, it is characterized in that: also comprise a low pressure pre-charge circuit, described low pressure pre-charge circuit comprises the auxiliary winding of the 380V that is connected transformer TM secondary, and the input of the auxiliary winding of 380V seals in precharge control switch KMY and is connected with three precharge power resistance R and with three-phase 380V input; The auxiliary node serial connection of the Control Node DO1 of master controller or PLC, precharge control switch KMY links to each other with the control winding of high-voltage switch gear QF; The auxiliary node serial connection of the Control Node DO2 of master controller or PLC, high-voltage switch gear QF links to each other with the control winding of precharge control switch KMY.
CN2010201534573U 2010-04-03 2010-04-03 Pre-charging circuit for high-voltage frequency converter using high-voltage technology CN201629677U (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102594159A (en) * 2012-02-16 2012-07-18 华为技术有限公司 Intermediate-voltage concatenated frequency converter, pre-charging method and system
CN103457451A (en) * 2013-08-22 2013-12-18 深圳市英威腾电气股份有限公司 High-voltage frequency converter low voltage power-on control circuit and control method thereof
CN103647458A (en) * 2013-12-24 2014-03-19 苏州汇川技术有限公司 Frequency conversion system and method and device for precharging high-voltage frequency converter in frequency conversion system
CN104038032A (en) * 2014-05-26 2014-09-10 株洲变流技术国家工程研究中心有限公司 Low-voltage precharging system for high-voltage variable frequency system, and control method of low-voltage precharging system
CN104811050A (en) * 2015-04-13 2015-07-29 广东明阳龙源电力电子有限公司 High-voltage frequency converter with centralized charged power units
CN105048825A (en) * 2015-09-23 2015-11-11 大禹电气科技股份有限公司 Super-power cascade type high-voltage inverter and method for surge inhibiting of super-power cascade type high-voltage inverter
CN105186886A (en) * 2015-10-27 2015-12-23 东方日立(成都)电控设备有限公司 Compensated current transformer system based on co-phase power supply technology and working method of compensated current transformer system
CN105207462A (en) * 2015-09-23 2015-12-30 北京动力源科技股份有限公司 High-voltage high-power frequency converter and electrical equipment provided with same
CN108267665A (en) * 2017-11-22 2018-07-10 珠海格力电器股份有限公司 Detection method, circuit, storage medium and the processor of busbar short-circuit

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102594159A (en) * 2012-02-16 2012-07-18 华为技术有限公司 Intermediate-voltage concatenated frequency converter, pre-charging method and system
CN102594159B (en) * 2012-02-16 2014-06-04 华为技术有限公司 Intermediate-voltage concatenated frequency converter, pre-charging method and system
CN103457451A (en) * 2013-08-22 2013-12-18 深圳市英威腾电气股份有限公司 High-voltage frequency converter low voltage power-on control circuit and control method thereof
CN103457451B (en) * 2013-08-22 2016-12-28 深圳市英威腾电气股份有限公司 A kind of high-voltage frequency converter low voltage electrifying control circuit and control method thereof
CN103647458B (en) * 2013-12-24 2016-03-23 苏州汇川技术有限公司 Frequency conversion system and carry out the method and apparatus of precharge to the high voltage converter in it
CN103647458A (en) * 2013-12-24 2014-03-19 苏州汇川技术有限公司 Frequency conversion system and method and device for precharging high-voltage frequency converter in frequency conversion system
CN104038032A (en) * 2014-05-26 2014-09-10 株洲变流技术国家工程研究中心有限公司 Low-voltage precharging system for high-voltage variable frequency system, and control method of low-voltage precharging system
CN104038032B (en) * 2014-05-26 2018-01-05 株洲变流技术国家工程研究中心有限公司 Low pressure pre-charge system and its control method for high voltage frequency conversion system
CN104811050A (en) * 2015-04-13 2015-07-29 广东明阳龙源电力电子有限公司 High-voltage frequency converter with centralized charged power units
CN105207462A (en) * 2015-09-23 2015-12-30 北京动力源科技股份有限公司 High-voltage high-power frequency converter and electrical equipment provided with same
CN105048825B (en) * 2015-09-23 2018-11-20 大禹电气科技股份有限公司 Super high power cascaded high-voltage frequency converter and its method for inhibiting surge
CN105048825A (en) * 2015-09-23 2015-11-11 大禹电气科技股份有限公司 Super-power cascade type high-voltage inverter and method for surge inhibiting of super-power cascade type high-voltage inverter
CN105207462B (en) * 2015-09-23 2018-07-31 北京动力源科技股份有限公司 A kind of high-voltage high-power frequency transformator and the electrical equipment with the frequency converter
CN105186886A (en) * 2015-10-27 2015-12-23 东方日立(成都)电控设备有限公司 Compensated current transformer system based on co-phase power supply technology and working method of compensated current transformer system
CN108267665A (en) * 2017-11-22 2018-07-10 珠海格力电器股份有限公司 Detection method, circuit, storage medium and the processor of busbar short-circuit
CN108267665B (en) * 2017-11-22 2020-10-02 珠海格力电器股份有限公司 Bus short circuit detection method, circuit, storage medium and processor

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