CN2641913Y - High voltage large power converter with buffer circuit - Google Patents

High voltage large power converter with buffer circuit Download PDF

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Publication number
CN2641913Y
CN2641913Y CN 03276709 CN03276709U CN2641913Y CN 2641913 Y CN2641913 Y CN 2641913Y CN 03276709 CN03276709 CN 03276709 CN 03276709 U CN03276709 U CN 03276709U CN 2641913 Y CN2641913 Y CN 2641913Y
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CN
China
Prior art keywords
current
voltage
limiting
buffer circuit
switch
Prior art date
Application number
CN 03276709
Other languages
Chinese (zh)
Inventor
倚鹏
Original Assignee
北京利德华福电气技术有限公司
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Publication date
Application filed by 北京利德华福电气技术有限公司 filed Critical 北京利德华福电气技术有限公司
Priority to CN 03276709 priority Critical patent/CN2641913Y/en
Application granted granted Critical
Publication of CN2641913Y publication Critical patent/CN2641913Y/en

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Abstract

The utility model discloses a high-pressure high-power transducer with a cushion circuit, which is characterized in that a cushion circuit is connected in series between a primary side of a rectifier transformer of a transducer and the high voltage switch of the power network. The cushion circuit consists of current-limiting resistances or current-limiting inductances and by-pass switches; the current-limiting resistances or current-limiting inductances are connected in series between every phase winding of the primary side of the rectifier transformer and the high voltage switch of the power network; the by-side switches are in parallel connected by the side of every current-limiting resistance or current-limiting inductance. Before the transducer system is electrified, the by-pass switch is in the turned-off state. After the switch of the transducer system is turned on, the current-limiting resistances/or current-limiting inductances limit the excitation and the charge current which transfer the transformer. After the charge course of the filter capacitor which is connected crossly between the parts of the commutate and the contravariance is completed, the by-pass switch is closed. Current-limiting resistances or current-limiting inductances are closed to make the system enter the normal work state. The cushion circuit can reduce the electrification impact of the power network to the transducer.

Description

The high-voltage high-power frequency transformator that has buffer circuit
Technical field
The utility model relates to a kind of high-voltage high-power frequency transformator, more particularly, relates to a kind of high-voltage high-power frequency transformator that has buffer circuit.
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, the low voltage voltage source type 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 just powering 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, particularly for adopting many level or plural serial stage tandem type frequency converter, 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 still 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, and this just 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 or the increase of cost 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 utility model provides a kind of high-voltage high-power frequency transformator that has buffer circuit.
For achieving the above object, the utility model is taked following design: a kind of high-voltage high-power frequency transformator that has buffer circuit, it comprises the rectifier transformer that has many secondary winding, rectifying part, filtering part, inversion part, it is characterized in that: be in series with a buffer circuit between the former limit of described rectifier transformer and electrical network high-voltage switch gear.
Described buffer circuit by current-limiting resistance/or current-limiting inductance and by-pass switch constitute; Described current-limiting resistance/or current-limiting inductance be 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/current-limiting inductance next door by-pass switch also in parallel.
Before frequency convertor system powers on, by-pass switch is in off-state, behind the frequency convertor system switch closure, current-limiting resistance/or current-limiting inductance restriction flow through the excitatory and charging current of rectifier transformer, after waiting to be connected across filter capacitor charging process between rectifying part and the inversion part and finishing, closes bypass switch, with current-limiting resistance/or current-limiting inductance bypass, make system enter normal operating state.
The buffer circuit because the utility model has been connected between the former limit of frequency converter rectifier transformer and electrical network high-voltage switch gear, by this buffer circuit restriction charging current, compare with traditional current-limiting method, both realized the purpose of surge in restriction charging current, the minimizing, reduced the number of components and parts again, improved the reliability of system, 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.
Description of drawings
Fig. 1 is traditional low pressure AC-DC-AC voltage-source type frequency changer schematic diagram
Fig. 2 is a three level high-voltage voltage-source type frequency changer schematic diagram
The high tension voltage source type frequency converter structural representation that Fig. 3 constitutes for the power model units in series
Fig. 4 is the former limit of the high-voltage high-power frequency transformator rectifier transformer partial structurtes schematic diagram that has buffer circuit
Embodiment
By Fig. 2, 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 in order to limit charging current, solves the problem of surge on the high-voltage high-power frequency transformator according to this design feature of high-power transformer, as shown in Figure 4, and series connection one buffer circuit 7 between frequency converter rectifier transformer 6 and electrical network high-voltage switch gear.
As shown in Figure 4, 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, 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.
The disclosed advantage that has the high-voltage high-power frequency transformator of buffer circuit of the utility model is: compare with traditional current-limiting method, reduced the number of components and parts, improved the reliability of system, volume is little, and cost is low.In addition, buffer circuit can be placed separately, is not subjected to the restriction in place.
The above is specific embodiment of the utility model and the know-why used, and is any based on the equivalent transformation on the technical solutions of the utility model basis, all belongs within the utility model protection range.

Claims (5)

1, a kind of high-voltage high-power frequency transformator that has buffer circuit, it comprises the rectifier transformer that has many secondary winding, rectifying part, filtering part, inversion part, it is characterized in that: be in series with a buffer circuit between the former limit of described rectifier transformer and electrical network high-voltage switch gear.
2, the high-voltage high-power frequency transformator that has buffer circuit according to claim 1, it 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.
3, the high-voltage high-power frequency transformator that has buffer circuit according to claim 1, it 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.
4, the high-voltage high-power frequency transformator that has buffer circuit according to claim 1, it 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.
5, according to claim 2 or the 3 or 4 described high-voltage high-power frequency transformators that have buffer circuit, it is characterized in that: described current-limiting resistance, current-limiting inductance and by-pass switch are high tension apparatus.
CN 03276709 2003-08-22 2003-08-22 High voltage large power converter with buffer circuit CN2641913Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 03276709 CN2641913Y (en) 2003-08-22 2003-08-22 High voltage large power converter with buffer circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 03276709 CN2641913Y (en) 2003-08-22 2003-08-22 High voltage large power converter with buffer circuit

Publications (1)

Publication Number Publication Date
CN2641913Y true CN2641913Y (en) 2004-09-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN 03276709 CN2641913Y (en) 2003-08-22 2003-08-22 High voltage large power converter with buffer circuit

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100386962C (en) * 2003-09-28 2008-05-07 北京利德华福电气技术有限公司 Second generation high-voltage large-power frequency converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100386962C (en) * 2003-09-28 2008-05-07 北京利德华福电气技术有限公司 Second generation high-voltage large-power frequency converter

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GR01 Patent grant
C25 Abandonment of patent right or utility model to avoid double patenting
AV01 Patent right actively abandoned

Effective date of abandoning: 20080507