CN1545198A - Second generation high-voltage large-power frequency converter - Google Patents

Second generation high-voltage large-power frequency converter Download PDF

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Publication number
CN1545198A
CN1545198A CNA031264735A CN03126473A CN1545198A CN 1545198 A CN1545198 A CN 1545198A CN A031264735 A CNA031264735 A CN A031264735A CN 03126473 A CN03126473 A CN 03126473A CN 1545198 A CN1545198 A CN 1545198A
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CN
China
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voltage
current
power
frequency converter
modified
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CNA031264735A
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Chinese (zh)
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CN100386962C (en
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鹏 倚
倚鹏
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北京利德华福电气技术有限公司
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Publication of CN100386962C publication Critical patent/CN100386962C/en

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Abstract

The invention discloses a modified high-voltage high-power frequency converter, and its character: there is a buffer circuit connected in series between the primary side of a multi-secondary winding rectifier transformer and the electric network high-voltage switches; or there is an AC winding added on the secondary side, which is connected with a low-voltage control power supply of the frequency converter. At the beginning of its high-voltage driving power supply being power-on, it can limit charging current by the above buffer circuit, reducing power-on impact of the electric network on it; or before electrified by the high-voltage driving power supply, it can reduce the power-on impact of the electric network on it. Compared with traditional current limiting methods, it not only implements charging current limitation and reduction of power-on impact of electronic network on it, but also reduces number of devices, heightens system reliability, and has small bulk and low cost.

Description

Modified high-voltage high

Technical field

The present invention relates to a kind of high-voltage high-power frequency transformator, more particularly, relate to a kind of modified high-voltage high that reduces surge on the electrical network.

Background technology

Variable-frequency control technique is as a kind of energy-conservation efficiently means, just obtains more and more widely application in various aspects such as China's electric power, metallurgy, petrochemical industry, municipal water supplies.Variable-frequency control technique has various circuit topology implementation, but AC-DC-AC type frequency converter becomes the main flow in market with advantages such as its speed-regulating range width, wide adaptability, dependable performances.

Low pressure AC-DC-AC type frequency converter mainly is followed in series to form by rectification, filtering, inversion three parts, and according to the difference of filtering part energy-storage travelling wave tube, AC-DC-AC type frequency converter can be divided into two kinds of current source type and voltage-source types.The current source type frequency converter is energy-storage travelling wave tube with the inductance, and the voltage-source type frequency converter is energy-storage travelling wave tube with electric capacity; The voltage-source type frequency converter is few to the harmonic pollution of electrical network, the power factor height, and the stability of a system is good, and control is simple, and therefore the trend that progressively replaces the current source type frequency converter arranged.

As shown in Figure 1, low tension potential source type ac-dc-ac frequency converter generally adopts diode rectifier bridge 1 as rectifying device, and electrochemical capacitor 2 is as energy-storage travelling wave tube.The charging current of limit electrolysis electric capacity 2 not in actual use, it is found that when frequency convertor system just powers on, if will be burnt the fuse of rectifier bridge 1 or its front.

For this reason, in low tension potential source type ac-dc-ac frequency converter, generally adopt resistor 3 restriction charging currents, waiting charging to finish after, with bypass relay or contactor 4 resistance 3 bypasses are gone out system again, burnt with the rectifier bridge of avoiding the voltage-source type frequency converter or the fuse of its front.

But, in high voltage converter (more than the line voltage 690V), since be subjected to the restriction of device withstand voltage and electrical machine insulation the restriction of tolerant common-mode voltage and dv/dt climbing, and consider the TL of electrical network to harmonic wave, if still adopt said method restriction charging current to be difficult to accomplish.

High-tension electricity potential source type big-power transducer generally has two kinds of forms: the voltage-source type frequency converter (Fig. 3) that three-level voltage source type frequency converter (Fig. 2) and power model units in series constitute.In these two kinds of frequency converters, still there is aforesaid charging current problem, still,, then there are a lot of problems if adopt aforesaid method restriction charging current.In three-level voltage source type frequency converter, each rectification and filter circuit part voltage is all than higher, and is not normal voltage, so bypass contactor will select high tension apparatus for use, causes the increase of volume and cost; Controlled power device and common-mode inductor addresses this problem if adopt fully, can cause the complexity in the control again.

In the voltage-source type frequency converter that the power model units in series constitutes, the voltage of each power cell inside is not high, if adopt prior art, can adopt resistor current limiting behind the rectifier bridge of each power cell, after charging is finished, uses the contactor bypass; This processing method has a lot of shortcomings.Because the power cell number is more, each power cell all will add a resistor and contactor, and is very complicated in the control; If contactor is selected band time-delay auto-closing for use, then can cause original reliability more unreliable with regard to low contactor; Such processing method also will cause the rising of volume and cost.

Summary of the invention

In view of the foregoing, the purpose of this invention is to provide a kind of modified high-voltage high that reduces electrical network to surge on the frequency converter.

For achieving the above object, the present invention takes following design: a kind of modified high-voltage high, it comprises many secondary winding rectifier transformer, rectifying part, filtering part, inversion part, it is characterized in that: have additional a buffer circuit on described many secondary winding rectifier transformer.

In specific embodiments of the invention, described buffer circuit is connected between the former limit and electrical network high-voltage switch gear of described many secondary winding rectifier transformer; Described buffer circuit is made of current-limiting resistance and by-pass switch; Described current-limiting resistance is connected between each phase winding of the former limit of rectifier transformer and the electrical network high-voltage switch gear; At each current-limiting resistance next door by-pass switch also in parallel.

In specific embodiments of the invention, described buffer circuit can also be made of AC Windings and the regulating circuit set up at described many secondary winding rectifier transformer secondary, and described AC Windings links to each other with the low-voltage control power of frequency converter by regulating circuit.

Described regulating circuit can be made of an alternating-current switch and a common voltage regulator series connection; Described regulating circuit can also be a thyristor bridge; Can also be the circuit that constitutes by rectifier bridge, filter capacitor, inverter bridge.

The buffer circuit because the present invention has connected between the former limit of frequency converter rectifier transformer and electrical network high-voltage switch gear, at the beginning of frequency convertor system powers on, flow through the excitatory and charging current of rectifier transformer by this buffer circuit restriction, after waiting to be connected across filter capacitor charging process between rectifying part and the inversion part and finishing, closes bypass switch, this buffer circuit is bypassed, make system enter normal operating state; Reduce the purpose of electrical network thereby reach, reduce the failure rate of frequency converter, reduce the maintenance cost of frequency converter surge on the frequency converter.The present invention compares with traditional current-limiting method, has both realized the purpose of surge in restriction charging current, the minimizing, has reduced the number of components and parts again, has improved the reliability of system, and volume is little, and cost is low.In addition, buffer circuit can be placed separately, is not subjected to the restriction in place, controls more flexible.

Because the present invention can also set up an AC Windings that links to each other with the control power supply at the secondary of frequency converter rectifier transformer, before frequency converter high voltage power power supply electrifying, make the voltage of each winding of transformer secondary progressively rise to rated voltage by this AC Windings earlier by zero, utilize this process, after making the filter capacitor that is connected across between rectifying part and the inversion part finish charging process, closed again frequency converter high voltage power mains switch, system is normally powered on, thereby reduce the last surge of electrical network to frequency converter, compare with traditional current-limiting method, both realized the restriction charging current, the purpose of surge in the minimizing, reduced the number of components and parts again, improved the reliability of system, volume is little, and cost is low.And, after frequency converter is finished safety and powered on, can also utilize this AC Windings to be blower fan, control circuit power supply, the influence that makes the operation of frequency converter not interrupted by factory's low-voltage control power.

Description of drawings

Fig. 1 is traditional low pressure AC-DC-AC voltage-source type frequency changer schematic diagram that has current-limiting resistance

Fig. 2 is a three level high-voltage voltage-source type ac-dc-ac frequency converter structural representation

The high-tension electricity potential source type ac-dc-ac frequency converter structural representation that Fig. 3 constitutes for the power model units in series

Fig. 4 improves back high-voltage high-power frequency transformator many secondary winding transformer partial structurtes schematic diagrames () for the present invention

Fig. 5 improves back high-voltage high-power frequency transformator many secondary winding transformer partial structurtes schematic diagrames (two) for the present invention

Fig. 6 improves back many secondary winding transformer partial structurtes schematic diagrames (three) for the present invention

Fig. 7 improves back many secondary winding transformer partial structurtes schematic diagrames (four) for the present invention

Embodiment

By Fig. 1~Fig. 3 as can be known, the difference of high-tension electricity potential source type high-power transformer and low voltage voltage source type frequency converter is: high-voltage high-power frequency transformator also is provided with a rectifier transformer 6 with many secondary winding between rectifying part and electrical network except including rectification 1, filtering 2, inversion 5 three parts.

The present invention is according to this design feature of high-power transformer, in order to limit charging current, reduce the last surge of electrical network to high-voltage high-power frequency transformator, as shown in Figure 4, the present invention's series connection one between the former limit of frequency converter rectifier transformer 6 and electrical network high-voltage switch gear can limit the buffer circuit 7 of charging current.

As shown in Figure 4, this buffer circuit 7 is made of current-limiting resistance 71 and by-pass switch 72.Current-limiting resistance 71 is connected between rectifier transformer 6 each phase winding of former limit and the electrical network high-voltage switch gear; At each current-limiting resistance 71 next door by-pass switch 72 also in parallel.Before powering on, by-pass switch 72 is in off-state, behind the frequency convertor system switch closure, current-limiting resistance 71 flows through restriction the excitatory and charging current of rectifier transformer 6, after the certain hour, promptly be connected across after filter capacitor 2 charging processes between rectifying part 1 and the inversion part 5 finish closes bypass switch 72, current-limiting resistance 71 is bypassed, make system enter normal operating state.

Because the former avris of rectifier transformer is a high-pressure section, so the current-limiting resistor 1 and the by-pass switch 2 that constitute buffer circuit 7 are high tension apparatus.

Among Fig. 4, current-limiting resistance 71 also can replace with current-limiting inductance, and in general, the volume of current-limiting inductance is big slightly, just can reach the effect identical with current-limiting resistance, but not consume active power; Also have,,, can save by-pass switch 72 if system is less demanding to voltage landing and power factor in the occasion of using current-limiting inductance.

In order to limit charging current, reduce the last surge of electrical network to high-voltage high-power frequency transformator, as shown in Figure 5, buffer circuit 7 can also be arranged on the secondary at frequency converter rectifier transformer 6, this buffer circuit 7 is made of AC Windings 73 and the regulating circuit 74 set up at many secondary winding transformer 6 secondary.

General high-voltage high-power frequency transformator all has two power supplies, and one is low-voltage control power, and its electric pressure is consistent with the control power supply of factory, is generally 380V; Another is the high voltage power power supply.AC Windings 73 of the present invention links to each other with low-voltage control power by regulating circuit 74.When frequency convertor system does not power on, be that the former limit of transformer 6 is not when linking to each other with the high voltage power power supply, on AC Windings 73, apply earlier a low-voltage control power, make on other winding of rectifier transformer 6 and induce normal operating voltage, thereby make filter capacitor 2 charging in advance between frequency converter rectifying part 1 and the inversion part 5; After treating that electric capacity 2 chargings are finished, the former limit of transformer 6 is linked to each other with the high voltage power power supply, make electric capacity 2 further charging again; Thereby the restriction charging current reduces the last surge of electrical network to high-voltage high-power frequency transformator.

Described regulating circuit 74 is made of an alternating-current switch 741 and a common voltage regulator 742.Before frequency converter high voltage power power supply electrifying, the closed alternating-current switch 741 of elder generation, regulate voltage regulator 742, make the voltage of transformer 6 each winding of secondary progressively rise to rated voltage, after this process is finished by zero, the filter capacitor that is connected across between rectifying part and the inversion part has been finished charging process, at this moment, disconnect alternating-current switch 741, closed again frequency converter high voltage power mains switch, system is normally powered on, thereby reduce the last surge of frequency converter.

Voltage regulator 742 can be made of common manual automatic coupling voltage regulator, realizes charging process by regulating manually before powering on; Also can constitute by electric voltage regulator.After the Frequency Converter Control system powers on, send a command signal by the control section of frequency converter, finish charging process automatically, after process to be charged is finished, send an instruction again and disconnect alternating-current switch 741, allow system high pressure electrical source of power closure.

Above-mentioned regulating circuit 74 also can be made of advanced at present power electronic power supply, Fig. 6 and Fig. 7 provide an example respectively, the controlled bridge that regulating circuit 74 shown in Figure 6 is made up of controllable silicon constitutes, it can regulate the voltage that is applied on the AC Windings 73 smoothly, realizes and the voltage regulator identical functions.

Fig. 7 then is another comparatively advanced form, can use general variable-frequency control technique, realizes the smooth adjustment of AC Windings 73 voltages.

The transformer secondary additional one with the identical AC Windings of control supply voltage, before frequency convertor system connection high voltage source, can the minimizing system on surge, finish charging to energy-storage travelling wave tube; After frequency convertor system is connected high voltage source, all right fan of this AC Windings, control circuit power supply, the reliability of increase frequency converter.Because; the control power supply of frequency converter be with factory in other many power consumption equipments connect together; because the maintenance or the switching of equipment; usually can cause the interruption of power supply; thereby threaten the security of operation of frequency converter; so; after frequency convertor system is connected high voltage source; utilize this AC Windings fan of frequency converter self transformer; the control circuit power supply; can guarantee when other operating personnel's misoperations; after making the control power supply power-fail of factory, the control circuit of frequency converter; blower fan still can operate as normal, makes the operation of frequency converter not be subjected to the influence of factory's control power interruptions.

The above is specific embodiments of the invention and the know-why used, and is any based on the equivalent transformation on the technical solution of the present invention basis, all belongs within the protection range of the present invention.

Claims (9)

1, a kind of modified high-voltage high, it comprises many secondary winding rectifier transformer, rectifying part, filtering part, inversion part, it is characterized in that: set up a buffer circuit on described many secondary winding rectifier transformer.
2, modified high-voltage high according to claim 1 is characterized in that: described buffer circuit is connected between the former limit and electrical network high-voltage switch gear of described many secondary winding rectifier transformer.
3, modified high-voltage high according to claim 2 is characterized in that: described buffer circuit is made of current-limiting resistance and by-pass switch; Described current-limiting resistance is connected between each phase winding of the former limit of rectifier transformer and the electrical network high-voltage switch gear; At each current-limiting resistance next door by-pass switch also in parallel.
4, modified high-voltage high according to claim 2 is characterized in that: described buffer circuit is made of current-limiting inductance and by-pass switch; Described current-limiting inductance is connected between each phase winding of the former limit of rectifier transformer and the electrical network high-voltage switch gear; At each current-limiting inductance next door by-pass switch also in parallel.
5, modified high-voltage high according to claim 2 is characterized in that: described buffer circuit is made of current-limiting inductance; Described current-limiting inductance is connected between each phase winding of the former limit of rectifier transformer and the electrical network high-voltage switch gear.
6, modified high-voltage high according to claim 1, it is characterized in that: described buffer circuit is made of AC Windings and the regulating circuit set up at described many secondary winding rectifier transformer secondary, and described AC Windings links to each other with the low-voltage control power of frequency converter by regulating circuit.
7, modified high-voltage high according to claim 6 is characterized in that: described regulating circuit is made of an alternating-current switch and a common voltage regulator series connection.
8, modified high-voltage high according to claim 6 is characterized in that: described regulating circuit is a thyristor bridge.
9, modified high-voltage high according to claim 6 is characterized in that: described regulating circuit is made of rectifier bridge, filter capacitor, inverter bridge.
CNB031264735A 2003-09-28 2003-09-28 Second generation high-voltage large-power frequency converter CN100386962C (en)

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Application Number Priority Date Filing Date Title
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101860232A (en) * 2010-03-29 2010-10-13 北京利德华福电气技术有限公司 Resonant type pre-charging circuit for high-voltage frequency converter and control method thereof
CN101860229A (en) * 2010-03-29 2010-10-13 北京利德华福电气技术有限公司 Thyristor voltage regulation type pre-charging circuit for high-voltage frequency converter and control method thereof
CN101860226A (en) * 2010-03-29 2010-10-13 北京利德华福电气技术有限公司 Phase-locking switching type pre-charging circuit for high-voltage frequency converter and control method thereof
CN101777826B (en) * 2009-12-24 2013-10-23 艾默生网络能源有限公司 Converter device and auxiliary circuit used for same
CN103441663A (en) * 2013-08-26 2013-12-11 广州智光电气股份有限公司 Cascade type high-voltage inverter pre-charging circuit and control method thereof
CN103441731A (en) * 2013-08-26 2013-12-11 广州智光电气股份有限公司 Charging circuit of high-voltage variable-frequency speed adjustment system and control method thereof
CN103580458A (en) * 2012-07-26 2014-02-12 珠海格力电器股份有限公司 Method and device for controlling capacitor charging circuit and capacitor charging circuit
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
CN104426406A (en) * 2013-08-29 2015-03-18 Ls产电株式会社 Inverter with power cell of dual structure

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CN101860225A (en) * 2010-03-29 2010-10-13 北京利德华福电气技术有限公司 Alternating current inversion type pre-charging circuit for high-voltage frequency converter and control method thereof
CN102497112A (en) * 2011-11-30 2012-06-13 连云港星火岸电工程有限公司 High voltage frequency conversion power supply device

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JPH069164A (en) * 1992-06-29 1994-01-18 Mitsubishi Electric Corp Control method and device of elevator
CN2641913Y (en) * 2003-08-22 2004-09-15 北京利德华福电气技术有限公司 High voltage large power converter with buffer circuit

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101777826B (en) * 2009-12-24 2013-10-23 艾默生网络能源有限公司 Converter device and auxiliary circuit used for same
CN101860232A (en) * 2010-03-29 2010-10-13 北京利德华福电气技术有限公司 Resonant type pre-charging circuit for high-voltage frequency converter and control method thereof
CN101860229A (en) * 2010-03-29 2010-10-13 北京利德华福电气技术有限公司 Thyristor voltage regulation type pre-charging circuit for high-voltage frequency converter and control method thereof
CN101860226A (en) * 2010-03-29 2010-10-13 北京利德华福电气技术有限公司 Phase-locking switching type pre-charging circuit for high-voltage frequency converter and control method thereof
CN103580458A (en) * 2012-07-26 2014-02-12 珠海格力电器股份有限公司 Method and device for controlling capacitor charging circuit and capacitor charging circuit
CN103441663A (en) * 2013-08-26 2013-12-11 广州智光电气股份有限公司 Cascade type high-voltage inverter pre-charging circuit and control method thereof
CN103441731A (en) * 2013-08-26 2013-12-11 广州智光电气股份有限公司 Charging circuit of high-voltage variable-frequency speed adjustment system and control method thereof
CN103441663B (en) * 2013-08-26 2016-09-21 广州智光电气股份有限公司 Precharge circuit for cascade high-voltage frequency converter and control method thereof
CN104426406A (en) * 2013-08-29 2015-03-18 Ls产电株式会社 Inverter with power cell of dual structure
CN104426406B (en) * 2013-08-29 2018-01-16 Ls产电株式会社 The inverter of power unit with double structure
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
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

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