CN203368028U - Cascade type multi-bypass dynamic voltage recovery device based on metalized film capacitor - Google Patents
Cascade type multi-bypass dynamic voltage recovery device based on metalized film capacitor Download PDFInfo
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- CN203368028U CN203368028U CN 201320382949 CN201320382949U CN203368028U CN 203368028 U CN203368028 U CN 203368028U CN 201320382949 CN201320382949 CN 201320382949 CN 201320382949 U CN201320382949 U CN 201320382949U CN 203368028 U CN203368028 U CN 203368028U
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Abstract
The utility model discloses a cascade type multi-bypass dynamic voltage recovery device based on a metalized film capacitor. The cascade type multi-bypass dynamic voltage recovery device based on the metalized film capacitor comprises multiple unit modules which are connected in series, wherein the unit modules connected in series is coupled with a filter unit to connect with an electric power system, each unit module comprises an energy storage system formed by the metalized film capacitor and an inversion unit used for outputting compensation voltage, and the energy storage system is connected in parallel with a positive and negative direct current bus of the inversion unit. The cascade type multi-bypass dynamic voltage recovery device employs the metalized film capacitor to realize energy storage requirements of a direct current side of the device, meets compensation requirements during short time voltage dropping in the electric power system, has properties of better dynamic response, longer compensation time, relatively long service life and maintenance-free property during the whole service life, and comprehensively meliorates disadvantages of great capacity deviation, low voltage, small current, great loss and poor frequency characteristic of a traditional energy storage component during application, and can realize no negative effects during compensation output.
Description
Technical field
The utility model relates to a kind of cascade connection type dynamic electric voltage recovery device that adopts metallization film capacitor energy-storage system and multiple bypass mechanism, belongs to electrical equipment technical field.
Background technology
Continuous development along with Chinese society economy, a large amount of precision equipments and instrument come into operation, and with it contradiction be that the power supply quality of electrical network of China is not high, line voltage moment rises sharply, rapid drawdown and flickering frequently occur, to the running precision of these precision equipments and instrument with use safety to form very large threat.In fact, even in mains supply quality countries and regions relatively preferably, due to the impact in factors such as load impact, non-linear, asymmetric loads, various transient electric-energy quality problems still frequently occur.
Voltage dip refers to the event that the supply power voltage effective value descends suddenly at short notice, and in electrical network, the duration of this phenomenon is mostly 0.5～1.5s.Voltage dip has become the topmost power quality problem of the large industrial electric energy user of impact with interruption.And the number of times of voltage dip occurs often more than voltage interruption, owing to falling temporarily, frequency is comparatively frequent, so on the whole, it is huge falling temporarily the loss brought.
Dynamic electric voltage recovery device (DVR) with meritorious tenability is a kind of high-end power quality controlling equipment, it is connected to various precision equipments and instrument front end, the various transient electric-energy quality problems such as fall/rise sharply by quick bucking voltage, thereby guarantee the load operation voltage stabilization.This device adopts metallization film capacitor as energy-storage travelling wave tube, in the time of can realizing compensation output to electrical network without negative interaction, and can realize non-maintaining.
This product is with a wide range of applications in fields such as petrochemical industry, electric power, semiconductor manufacture, industrial robot and medicine equipments.Dynamic electric voltage recovery device can effectively be avoided the serious consequence of falling and rising sharply and cause due to voltage, has significant social benefit.By avoiding voltage to fall and the produced various losses that rise sharply, can greatly improve the service efficiency of electric energy and other energy, thereby become energy-saving and cost-reducing effective way.
Summary of the invention
The utility model provides a kind of dynamic electric voltage recovery device of the multiple bypass of cascade connection type based on metallization film capacitor, meet that bucking voltage is fallen and the power quality problem that rises sharply under, adopted metallization film capacitor as energy-storage travelling wave tube, while realizing compensation output to electrical network without negative interaction, and can realize non-maintaining; Adopt multiple by-pass unit design in main circuit structure, improved greatly the reliability of equipment.
To achieve these goals, the utility model adopts following technical scheme:
The multiple bypass dynamic electric voltage recovery device of cascade connection type based on metallization film capacitor, it is characterized in that: comprise a plurality of unit modules that are connected in series, a plurality of unit module series connection are by overcoupling filter unit access electric power system, described each unit module comprises the energy-storage system that is comprised of metallization film capacitor and, for exporting the inversion unit of bucking voltage, described energy-storage system is connected in parallel on the positive and negative DC bus of inversion unit.
Described unit module further comprises the charging device that metallization film capacitor is charged, and between this charging device and energy-storage system, is in series with electronic switch.
Described charging device, comprise high frequency transformer and the single-phase rectification bridge be comprised of four fast recovery diodes.
Described inversion unit comprises the half-bridge converter be comprised of four switching devices.
The two ends of described energy-storage system are parallel with the discharge resistance R1 for energy storage system discharges.
The output of described unit module is connected with the unit module by-pass unit, this unit module by-pass unit is mainly by not controlling rectifier bridge and thyristor forms, the described rectifier bridge of not controlling is comprised of four diodes, and described thyristor is parallel between the positive and negative busbar of not controlling rectifier bridge.
Further be parallel with the resistance-capacitance absorption loop between the described positive and negative busbar of not controlling rectifier bridge, this resistance-capacitance absorption loop mainly is comprised of resistance R 2 and capacitor C 2.
Described coupling filter unit mainly is comprised of inductance and the electric capacity of series connection.
The two ends of described coupling filter unit further are parallel with the dynamic electric voltage recovery device by-pass unit, so that whole voltage restorer is cut off.
Electric power system further includes the mechanical switch K4 in parallel with the dynamic electric voltage recovery device by-pass unit.
Compared with prior art, the multiple bypass dynamic electric voltage recovery device of the cascade connection type of the utility model based on metallization film capacitor at least has the following advantages: the utility model adopts metallization film capacitor as energy-storage travelling wave tube, can realize when output compensation to electrical network without negative interaction, and can realize non-maintaining; The utility model adopts multiple by-pass unit design, has improved greatly the reliability of equipment.
The accompanying drawing explanation
Fig. 1: the multiple bypass dynamic electric voltage recovery device of the cascade connection type of the utility model based on metallization film capacitor main circuit structure figure;
Fig. 2: unit module structure chart.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
The main circuit structure figure that accompanying drawing 1 is the multiple bypass dynamic electric voltage recovery device of the cascade connection type of the utility model based on metallization film capacitor, comprise system power supply, adopts the dynamic electric voltage recovery device of H bridge cascade structure, corresponding mechanical switch, load.Wherein, the unit module that N1-N5 is 5 grades of cascades, K1, K2, K3, K4 are corresponding series-parallel connection mechanical switch.A plurality of unit module series connection are by overcoupling filter unit access electric power system, described coupling filter unit mainly is comprised of inductance and the electric capacity of series connection, the two ends of described coupling filter unit further are parallel with the dynamic electric voltage recovery device by-pass unit, so that whole voltage restorer is cut off.
Refer to shown in Fig. 2, described unit module comprises charging device M1 that metallization film capacitor is charged, for the energy-storage system C0 formed by metallization film capacitor of storage of electrical energy, for exporting the inversion unit M0 of bucking voltage, and for unit module being carried out to the unit module bypass circuit unit M2 of bypass.
Described charging device comprises the single-phase rectification bridge be comprised of four fast recovery diodes, and the front end of this single-phase rectification bridge is parallel with high frequency transformer, between described charging device and energy-storage system, is in series with electronic switch, as charge initiation and excision switch.
The half-bridge converter that described inversion unit mainly is comprised of four diodes forms, be parallel with Absorption Capacitance C1 with half-bridge converter, be connected in parallel to the resistance-capacitance absorption loop with Absorption Capacitance C1, described resistance-capacitance absorption loop comprises thyristor, the discharge resistance R1 be connected in series.
Described unit module bypass circuit mainly is comprised of four diodes does not control rectifier bridge, the thyristor T in parallel with not controlling rectifier bridge
j, and be connected in parallel on thyristor T
jresistance R 2 and the capacitor C 2 of two ends and series connection mutually.
The utility model is as the metallization film capacitor of energy-storage system, and its appearance value is determined according to capacity, make-up time and the compensation depth of institute's compensating load.Than the dynamic electric voltage recovery device that adopts other energy-storage units, this device has better dynamic response, higher useful life, whole life period, fully non-maintaining, and improve that traditional energy-storage travelling wave tube capacity tolerance is large, voltage is low, electric current is little comprehensively, loss reaches greatly the defects in application such as frequency characteristic is poor.
Described metallization film capacitor capacity tolerance is little, loss is little, can be filled to its speed of discharging by internal resistance of observation under operating voltage according to the selected metallization film capacitor of actual measurement, if electric discharge is very fast, the loss of voltage caused after the quick charge device that can adopt the designed high frequency transformer of the utility model to add the compositions such as fast recovery diode and current-limiting resistance discharges to metallization film capacitor compensates, if electric discharge, in the scope of a permission, can be omitted above-mentioned charging device.After each bucking voltage is fallen, on storage capacitor, the voltage magnitude landing is larger, now by IGBT switch in main circuit, implements the respective switch action and charges to metallization film capacitor.
When the faults such as overcurrent or module failure occurring, the dynamic electric voltage recovery device by-pass unit will the whole compensation arrangement of bypass, to reduce the harm to compensation arrangement, simultaneously the say the word switch (being K4A, K4B, K4C) that will be parallel to thyristor of compensation arrangement is closed to share the electric current in thyristor, reduces the heat radiation of thyristor.Out of service with being about to the thyristor bypass branch after the mechanical switch closure.
In the utility model, in each unit module, the series-parallel connection mechanical switch is to improve the reliability of compensation arrangement, as the K1 in Fig. 1, K2, K3.When compensation arrangement moves, K2, K3 closure, K1, K4A, K4B, K4C disconnect.When breaking down or need maintenance by the compensation arrangement bypass, need dynamic electric voltage recovery device by-pass unit and in parallel K4A, K4B thereof, K4C switch closure by the compensation arrangement bypass, again by the K1 closure, confirm after the K1 closure, K2, K3 to be disconnected, to guarantee the continuity to load supplying, after after this needing closed corresponding earthed switch etc. to install to isolate fully, overhauled.
Fig. 2 is the unit module structural representation that the utility model adopts, single inversion unit that in figure, M0 is the cascade of H bridge, and wherein C0 is energy-storage system, and R1 is the discharge resistance for the storage capacitor electric discharge, and C1 is the Absorption Capacitance in parallel and IGBT switching device.The M1 unit is charhing unit, the high frequency transformer of its front termination low capacity.The unit module by-pass unit that M2 is the unit module bypass.
Add the unit module by-pass unit at each unit module output, this by-pass unit is comprised of 4 diodes the thyristor of not controlling rectifier bridge and being parallel to positive and negative busbar and forms.After a certain module breaks down, whole compensation arrangement need not be exited, by above-mentioned unit module by-pass unit, by its bypass, all the other modules are shared the voltage that needs output jointly, to improve the reliability of compensation arrangement.
The main circuit structure figure that Fig. 1 is the multiple bypass dynamic electric voltage recovery device of the cascade connection type of the utility model based on metallization film capacitor, adopt H bridge cascade structure, in figure, can find out, after some unit modules break down, can be by figure, in 2, unit module by-pass unit M2 is by its bypass, and now bucking voltage is shared jointly by remaining 4 unit modules, and remaining unit module output voltage will be higher than the rated output voltage of design.
In the utility model, in each facies unit, the quick by-pass unit of parallel thyristors is to meet the rapidity of bypass requirement.As there is antiparallel thyristor at the two ends of each cascade module in Fig. 2, when the faults such as overcurrent or module failure occurring, the quick bypass branch of thyristor will the whole compensation arrangement of bypass, to reduce the harm to compensation arrangement, simultaneously the say the word switch (being K4A, K4B, K4C) that will be parallel to thyristor of compensation arrangement is closed to share the electric current in thyristor, reduces the heat radiation of thyristor.Out of service with being about to the thyristor bypass branch after the mechanical switch closure.
The foregoing is only a kind of execution mode of the present utility model, it not whole or unique execution mode, the conversion of any equivalence that those of ordinary skills take technical solutions of the utility model by reading the utility model specification, be claim of the present utility model and contain.
Claims (10)
1. the multiple bypass dynamic electric voltage recovery device of the cascade connection type based on metallization film capacitor, it is characterized in that: comprise a plurality of unit modules that are connected in series, a plurality of unit module series connection are by overcoupling filter unit access electric power system, described each unit module comprises energy-storage system (C0) and the inversion unit (M0) for exporting bucking voltage be comprised of metallization film capacitor, and described energy-storage system is connected in parallel on the positive and negative DC bus of inversion unit.
2. dynamic electric voltage recovery device as claimed in claim 1, it is characterized in that: described unit module further comprises the charging device (M1) that metallization film capacitor is charged, and between this charging device (M1) and energy-storage system (C0), is in series with electronic switch.
3. dynamic electric voltage recovery device according to claim 2, it is characterized in that: described charging device comprises high frequency transformer and the single-phase rectification bridge be comprised of four fast recovery diodes.
4. dynamic electric voltage recovery device according to claim 1, it is characterized in that: described inversion unit comprises the half-bridge converter be comprised of four switching devices.
5. dynamic electric voltage recovery device according to claim 1, it is characterized in that: the two ends of described energy-storage system are parallel with the discharge resistance (R1) for energy storage system discharges.
6. dynamic electric voltage recovery device according to claim 1, it is characterized in that: the output of described unit module is connected with the unit module by-pass unit, this unit module by-pass unit is mainly by not controlling rectifier bridge and thyristor forms, the described rectifier bridge of not controlling is comprised of four diodes, and described thyristor is parallel between the positive and negative busbar of not controlling rectifier bridge.
7. dynamic electric voltage recovery device according to claim 6 is characterized in that: further be parallel with the resistance-capacitance absorption loop between the described positive and negative busbar of not controlling rectifier bridge, this resistance-capacitance absorption loop mainly is comprised of resistance (R2) and electric capacity (C2).
8. dynamic electric voltage recovery device according to claim 1 is characterized in that: described coupling filter unit mainly is comprised of inductance and the electric capacity of series connection.
9. dynamic electric voltage recovery device according to claim 1, it is characterized in that: the two ends of described coupling filter unit further are parallel with the dynamic electric voltage recovery device by-pass unit, so that whole voltage restorer is cut off.
10. dynamic electric voltage recovery device according to claim 9, it is characterized in that: electric power system further includes the mechanical switch in parallel with the dynamic electric voltage recovery device by-pass unit (K4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320382949 CN203368028U (en) | 2013-06-28 | 2013-06-28 | Cascade type multi-bypass dynamic voltage recovery device based on metalized film capacitor |
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| CN 201320382949 CN203368028U (en) | 2013-06-28 | 2013-06-28 | Cascade type multi-bypass dynamic voltage recovery device based on metalized film capacitor |
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| CN203368028U true CN203368028U (en) | 2013-12-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882890A (en) * | 2015-05-28 | 2015-09-02 | 株洲变流技术国家工程研究中心有限公司 | Current limiting type dynamic voltage restorer and uninterrupted power supply method thereof |
-
2013
- 2013-06-28 CN CN 201320382949 patent/CN203368028U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882890A (en) * | 2015-05-28 | 2015-09-02 | 株洲变流技术国家工程研究中心有限公司 | Current limiting type dynamic voltage restorer and uninterrupted power supply method thereof |
| CN104882890B (en) * | 2015-05-28 | 2018-04-17 | 株洲变流技术国家工程研究中心有限公司 | A kind of current-limiting type dynamic electric voltage recovery device and its uninterrupted power supply method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131225 |
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| CX01 | Expiry of patent term |