CN104038032B - Low pressure pre-charge system and its control method for high voltage frequency conversion system - Google Patents

Low pressure pre-charge system and its control method for high voltage frequency conversion system Download PDF

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Publication number
CN104038032B
CN104038032B CN201410225259.6A CN201410225259A CN104038032B CN 104038032 B CN104038032 B CN 104038032B CN 201410225259 A CN201410225259 A CN 201410225259A CN 104038032 B CN104038032 B CN 104038032B
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CN
China
Prior art keywords
voltage
charge
frequency conversion
resistance
low pressure
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Application number
CN201410225259.6A
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Chinese (zh)
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CN104038032A (en
Inventor
何伯钧
罗仁俊
黄欢
邓飞
邓霆
彭勃
肖伟
钟强
陈志新
王世平
王博
王飞鹏
何健明
雷立
熊强
汪小梅
王龙
陈孟君
李萍
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株洲变流技术国家工程研究中心有限公司
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Publication of CN104038032A publication Critical patent/CN104038032A/en
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Abstract

The invention discloses a kind of low pressure pre-charge system and its control method for high voltage frequency conversion system, the low pressure pre-charge system includes:High voltage power supply;High-voltage switch gear, its input receive the high voltage power supply;Transformer, its primary side connect the output end of the high-voltage switch gear, and its secondary connects the high voltage frequency conversion system;Low-tension supply;Low pressure pre-charge circuit, its input receives the low-tension supply, its output end is connected with the low pressure winding of the transformer, the low pressure pre-charge circuit include precharge switch, connect with the precharge switch pre-charge resistance, connected with the pre-charge resistance maintenance resistance and with it is described maintain resistor coupled in parallel by-pass switch.Compared to high pressure pre-charge circuit, low pressure pre-charge system of the invention can greatly reduce product cost, effectively reduce the spatial volume of system, can impact of the limiting short-circuit current to power-supply system, while effectively reduce pre-charge resistance power consumption.

Description

Low pressure pre-charge system and its control method for high voltage frequency conversion system

Technical field

The present invention relates to power electronics and High-voltage Frequency Conversion Technology field, more particularly to it is a kind of for the low of high voltage frequency conversion system Press pre-charge system and its control method.

Background technology

Development with Power Electronic Technique and the research to high-voltage frequency converter technology are goed deep into, and high voltage converter is extensive It is applied in the drive system of the high-power machinery equipment such as blower fan, water pump, compressor.

There is the energy-storage travelling wave tubes such as electric capacity in high voltage frequency conversion system, can be produced in the moment that high-voltage switch gear closes a floodgate and be several times as much as frequency conversion system The excitation surge current for rated current of uniting, the excitation surge current can produce huge rush to common frequency power network and high voltage frequency conversion system Hit, the normal startup and operation of high voltage frequency conversion system will be influenceed when serious.

To solve the problem, existing high-pressure frequency-conversion product is required for being pre-charged by high pressure before start-up operation Journey.Fig. 1 is the schematic diagram for the high pressure pre-charge circuit for being used for high voltage frequency conversion system in the prior art.Prior art is utilized in height The high-voltage switch gear 10 of voltage source outlet side series connection pre-charge resistance 11 come suppress high-voltage switch gear 10 close a floodgate when excitation surge Electric current.Specifically, when the DC voltage of high voltage frequency conversion system charges to setting threshold values, the bypass of closure pre-charge resistance 11 is opened 13 are closed, and then realizes high pressure pre-charge process.

But high voltage connector (high-voltage switch gear) and high pressure pre-charge resistance cost are higher used by prior art, and its The spatial volume of occupancy is larger, therefore this pre-charging schemes have turned into what restriction high-pressure frequency-conversion product cost of implementation effectively controlled One of key factor.

The content of the invention

One of technical problems to be solved by the invention are to need to provide a kind of low pressure preliminary filling for high voltage frequency conversion system Electric system, the system can greatly reduce product cost, effectively reduce the spatial volume of system, limiting short-circuit current is to electricity The impact of source system, while effectively reduce the power consumption of pre-charge resistance.In addition, additionally provide a kind of for high voltage frequency conversion system The control method of low pressure pre-charge system.

In order to solve the above-mentioned technical problem, the invention provides a kind of low pressure for high voltage frequency conversion system to be pre-charged system System, the low pressure pre-charge system include:High voltage power supply;High-voltage switch gear, its input receive the high voltage power supply;Transformer, its Primary side connects the output end of the high-voltage switch gear, and its secondary connects the high voltage frequency conversion system;Low-tension supply;Low pressure precharge electricity Road, its input receive the low-tension supply, and its output end is connected with the low pressure winding of the transformer, the low pressure precharge Circuit includes precharge switch, the pre-charge resistance connected with the precharge switch, the dimension connected with the pre-charge resistance Resistance and the by-pass switch with the maintenance resistor coupled in parallel are held, wherein, line precharge is being entered to the high voltage frequency conversion system When, the low-tension supply carries out anti-high pressure by the low pressure pre-charge circuit and the transformer to the high voltage frequency conversion system Charging;In the high voltage frequency conversion system normal operation, the high voltage power supply by the high-voltage switch gear and the transformer to The high voltage frequency conversion system provides power supply.

In one embodiment, the resistance lower limit for maintaining resistance and the pre-charge resistance enables to charge to institute The DC voltage for stating high voltage frequency conversion system maintains certain threshold value, the resistance upper limit for maintaining resistance and the pre-charge resistance Enable to be preset at one in short circuit current caused by the high voltage power supply and the low-tension supply during high-voltage switch gear combined floodgate Determine scope.

In one embodiment, the precharge switch and the by-pass switch are lv contactor, the high-voltage switch gear For high voltage connector.

In one embodiment, the transformer is phase-shifting transformer.

According to another aspect of the present invention, a kind of low pressure preliminary filling as described above for being used for high voltage frequency conversion system is additionally provided The control method of electric system, this method include:The by-pass switch is first closed, closes the precharge switch afterwards, is made described low Voltage source carries out anti-high-voltage charging by the pre-charge resistance and the transformer to the high voltage frequency conversion system;Detecting When the DC voltage of the high voltage frequency conversion system is charged to certain threshold value, the by-pass switch is disconnected, closes the high-voltage switch gear, The short circuit when high-voltage switch gear closes a floodgate between the high voltage power supply and the low-tension supply is suppressed by the maintenance resistance Electric current;After detecting that the high-voltage switch gear closes a floodgate, the precharge switch is then turned off.

Compared with prior art, one or more embodiments of the invention can have the following advantages that:

The present invention proposes a kind of technically more perfect low pressure pre-charge system for high voltage frequency conversion system.Compared to height Pre-charge circuit is pressed, low pressure pre-charge system of the invention can greatly reduce product cost, effectively reduce the space body of system Product.Moreover, resistance is maintained by connecting to put into pre-charge circuit, so as to be closed using larger resistance value to suppress high-voltage switch gear Short circuit current during lock between high voltage power supply and low-tension supply, impact of the limiting short-circuit current to power-supply system, while effectively subtract The power consumption of few pre-charge resistance.In addition, after the completion of precharge, the low pressure pre-charge system switched by first closed high, after The such operation of precharge switch is disconnected, being capable of without dead electricity switching time, and then effectively avoid switching in dead electricity handoff procedure Precharge failure phenomenon caused by division delay.

Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by specification, rights Specifically noted structure is realized and obtained in claim and accompanying drawing.

Brief description of the drawings

Accompanying drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention Apply example to be provided commonly for explaining the present invention, be not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the schematic diagram for the high pressure pre-charge circuit for being used for high voltage frequency conversion system in the prior art;

Fig. 2 is the schematic diagram of the low pressure pre-charge system for high voltage frequency conversion system according to embodiments of the present invention.

Embodiment

To make the object, technical solutions and advantages of the present invention clearer, the present invention is made below in conjunction with accompanying drawing further Ground describes in detail.

Fig. 2 is the schematic diagram of the low pressure pre-charge system for high voltage frequency conversion system according to embodiments of the present invention.Below Describe the composition 26S Proteasome Structure and Function of the system in detail with reference to figure 2.

As shown in Fig. 2 the low pressure pre-charge system mainly includes:High voltage power supply, low-tension supply, high-voltage switch gear 21, transformation Device 22 and low pressure pre-charge circuit 23.The input of high-voltage switch gear 21 receives high voltage power supply, its output end and the original of transformer 22 Side connects.The secondary of transformer 22 is connected with high voltage frequency conversion system.The input of low pressure pre-charge circuit 23 receives low-tension supply, Its output end is connected with the low pressure winding (generally 380V windings) of transformer 22.In one embodiment, the transformer 22 is excellent Elect phase-shifting transformer as, high voltage power supply refers generally to a kilovolt step voltage.

When entering line precharge to high voltage frequency conversion system, low-tension supply by low pressure pre-charge circuit 23 and transformer 22 to High voltage frequency conversion system carries out anti-high-voltage charging;In high voltage frequency conversion system normal operation, high voltage power supply passes through the He of high-voltage switch gear 21 Transformer 22 provides power supply to high voltage frequency conversion system.

Wherein, low pressure pre-charge circuit 23 mainly includes:Precharge switch 231, pre-charge resistance 233, maintain resistance 235 And by-pass switch 237.Precharge switch 231 is arranged on the input of low pressure pre-charge circuit, is connected with low-tension supply.Preliminary filling Core component of the resistance 233 as low pressure pre-charge circuit, it is arranged on the output end of precharge switch 231, is established by cable with preliminary filling Close 231 series connection.Resistance 235 is maintained to be arranged on the output end of pre-charge resistance 233, connected with pre-charge resistance 233, and and transformation The low pressure winding connection of device 22.Maintain resistance 235 be used for suppressing when high-voltage switch gear 21 closes a floodgate high voltage power supply and low-tension supply it Between short circuit current.Maintain resistance 235 both ends be parallel with by-pass switch 237, by by-pass switch 237 point, close a floodgate come Realize the switching for maintaining resistance 235.

It should be noted that selected maintenance resistance 235 and pre-charge resistance 233 needs to meet following condition:Maintain The DC voltage that the resistance lower limit of resistance 235 and pre-charge resistance 233 can make to charge to high voltage frequency conversion system maintains necessarily Threshold value, in high voltage power supply and low when maintaining the resistance upper limit of resistance 235 and pre-charge resistance 233 to make the high-voltage switch gear 21 close a floodgate Short circuit current is preset at certain limit caused by voltage source.So it is to prevent from, because pre-charge resistance 233 is excessive, causing to fill Electric overlong time, charged DC voltage are less than certain threshold value.

Precharge switch 231 and by-pass switch 237 are preferably lv contactor, and high-voltage switch gear 21 is preferably high pressure contact Device.

Resistance 235 is maintained due to increasing in the output end of pre-charge resistance 233, when can so suppress the combined floodgate of high-voltage switch gear 21 Short circuit current between high voltage power supply and low-tension supply, impact of the limiting short-circuit current to power-supply system, while effectively reduce pre- The power consumption of charging resistor.

For high pressure pre-charge circuit, device belongs to low pressure used by the low pressure pre-charge circuit 23 of the system The device in field, product cost can be greatly reduced, effectively reduce the spatial volume of system.

The following detailed description of how to control, the low pressure pre-charge system of the present embodiment is pre- to high voltage frequency conversion system progress low pressure Charging.

Under the original state of system, high-voltage switch gear 21 disconnects, precharge switch 231 disconnects, by-pass switch 237 disconnects.

By-pass switch 237 is first closed, it is rear to close precharge switch 231, low-tension supply is begun through pre-charge resistance 233 and transformer 22 carry out anti-high-voltage charging to high voltage frequency conversion system.

After the DC voltage of system detectio to high voltage frequency conversion system reaches setting threshold values, by-pass switch 237, closure are disconnected The high-voltage switch gear 21, system maintain resistance 235 to suppress high voltage power supply and low tension when high-voltage switch gear 21 closes a floodgate by putting into Short circuit current between source.After system detectio to high-voltage switch gear 21 is closed a floodgate, precharge switch 231, low pressure preliminary filling are then turned off Electric process terminates.

It should be noted that maintenance resistance is not put into initial stage, using less resistance to high voltage frequency conversion system in precharge Enter line precharge, due to the speed of this charge mode, be advantageous to the higher pre-charge voltage of quick foundation.

Moreover, after pre-charge voltage foundation, resistance is maintained by input of being connected in low pressure pre-charge circuit, so as to profit Suppress short circuit current when high-voltage switch gear closes a floodgate between high voltage power supply and low-tension supply with larger resistance value, limit short circuit electricity The impact to power-supply system is flowed, while effectively reduces the power consumption of pre-charge resistance.

In addition, after the completion of precharge, switched by first closed high, the rear this operation for disconnecting precharge switch, energy Enough without dead electricity switching times, and then the precharge for effectively avoiding switching in dead electricity handoff procedure caused by division delay unsuccessfully shows As being advantageous to the stable of high voltage frequency conversion system and starting and run.

In summary, can be greatly reduced compared to high pressure pre-charge circuit, the low pressure pre-charge system of the embodiment of the present invention Product cost, effectively reduce the spatial volume of system.Moreover, resistance is maintained by connecting to put into pre-charge circuit, so as to profit Suppress short circuit current when high-voltage switch gear closes a floodgate between high voltage power supply and low-tension supply with larger resistance value, limit short circuit electricity The impact to power-supply system is flowed, while effectively reduces the power consumption of pre-charge resistance.In addition, after the completion of precharge, the low pressure is pre- Charging system switched by first closed high, it is rear disconnect operation as precharge switch, can without dead electricity switching time, enter And effectively avoid switching the precharge failure caused by division delay in dead electricity handoff procedure.

It is described above, it is only the specific implementation case of the present invention, protection scope of the present invention is not limited thereto, any ripe Those skilled in the art are known in technical specification of the present invention, modifications of the present invention or replacement all should be in the present invention Protection domain within.

Claims (3)

1. a kind of control method of low pressure pre-charge system for high voltage frequency conversion system, the low pressure pre-charge system include: High voltage power supply;
High-voltage switch gear, its input receive the high voltage power supply;
Transformer, its primary side connect the output end of the high-voltage switch gear, and its secondary connects the high voltage frequency conversion system;
Low-tension supply;
Low pressure pre-charge circuit, its input receive the low-tension supply, and its output end and the low pressure winding of the transformer connect Connect, the low pressure pre-charge circuit include precharge switch, connected with the precharge switch pre-charge resistance, with it is described pre- Charging resistor series connection maintains resistance and the by-pass switch with the maintenance resistor coupled in parallel,
Wherein, when entering line precharge to the high voltage frequency conversion system, the low-tension supply passes through the low pressure pre-charge circuit With the transformer anti-high-voltage charging is carried out to the high voltage frequency conversion system;In the high voltage frequency conversion system normal operation, institute State high voltage power supply and provide power supply to the high voltage frequency conversion system by the high-voltage switch gear and the transformer;
The resistance lower limit for maintaining resistance and the pre-charge resistance enables to charge to the straight of the high voltage frequency conversion system Stream voltage maintains certain threshold value, and the resistance upper limit for maintaining resistance and the pre-charge resistance enables to the height to press off When closing lock certain limit is preset in short circuit current caused by the high voltage power supply and the low-tension supply;
This method includes:
The by-pass switch is first closed, closes the precharge switch afterwards, the low-tension supply is passed through the pre-charge resistance With the transformer anti-high-voltage charging is carried out to the high voltage frequency conversion system;
When the DC voltage for detecting the high voltage frequency conversion system is charged to certain threshold value, the by-pass switch is disconnected, is closed The high-voltage switch gear, the high voltage power supply and the low tension when high-voltage switch gear closes a floodgate are suppressed by the maintenance resistance Short circuit current between source;
After detecting that the high-voltage switch gear closes a floodgate, the precharge switch is then turned off.
2. the control method of the low pressure pre-charge system according to claim 1 for high voltage frequency conversion system, the preliminary filling Electric switch and the by-pass switch are lv contactor, and the high-voltage switch gear is high voltage connector.
3. the control method of the low pressure pre-charge system according to claim 1 or 2 for high voltage frequency conversion system, its feature It is, the transformer is phase-shifting transformer.
CN201410225259.6A 2014-05-26 2014-05-26 Low pressure pre-charge system and its control method for high voltage frequency conversion system CN104038032B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201523337U (en) * 2009-10-30 2010-07-07 湖南中科电气股份有限公司 High-voltage high-power frequency converter by using low-voltage power to pre-charge
CN201629677U (en) * 2010-04-03 2010-11-10 东方电子股份有限公司 Pre-charging circuit for high-voltage frequency converter using high-voltage technology
CN203289169U (en) * 2013-06-17 2013-11-13 上海亿思特电气股份有限公司 Pre-charging device of power unit cascaded high-voltage inverter
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201523337U (en) * 2009-10-30 2010-07-07 湖南中科电气股份有限公司 High-voltage high-power frequency converter by using low-voltage power to pre-charge
CN201629677U (en) * 2010-04-03 2010-11-10 东方电子股份有限公司 Pre-charging circuit for high-voltage frequency converter using high-voltage technology
CN203289169U (en) * 2013-06-17 2013-11-13 上海亿思特电气股份有限公司 Pre-charging device of power unit cascaded high-voltage inverter
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

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