CN2882074Y - Series active filter with short-circuit current-limit function - Google Patents
Series active filter with short-circuit current-limit function Download PDFInfo
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- CN2882074Y CN2882074Y CNU2006200696485U CN200620069648U CN2882074Y CN 2882074 Y CN2882074 Y CN 2882074Y CN U2006200696485 U CNU2006200696485 U CN U2006200696485U CN 200620069648 U CN200620069648 U CN 200620069648U CN 2882074 Y CN2882074 Y CN 2882074Y
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- 230000008878 coupling Effects 0.000 claims abstract description 35
- 238000010168 coupling process Methods 0.000 claims abstract description 35
- 238000005859 coupling reaction Methods 0.000 claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims description 8
- 238000004146 energy storage Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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Abstract
The utility model discloses a series active filter with function of short circuiting and current limiting, which comprises a coupling transformer, a voltage supply inverter, an accumulator capacitor, and an output filter inductor. Wherein, the accumulator capacitor is connected at the DC input end of the voltage supply inverter. The AC output from the voltage supply inverter is added onto the primary side of the coupling transformer after being filtered by the output filter inductor. The secondary side of the coupling transformer is connected in series with the line between an AC power supply and a load. The utility model is characterized in that the coupling transformer is a coupling transformer with variable impedance of over-current magnetic circuit saturation. When any short circuit happens, the utility model can automatically and efficiently limit the rising of the short-circuited current, which eliminates a special short-circuit current limiter, and can save investment.
Description
Technical field
The utility model is a kind of alternating voltage electric power system that is applied to, under the normal situation of system, system is carried out series active filtering, to improve the quality of power supply, under the situation that has short trouble to take place, to the device that short-circuit current and climbing thereof limit, belong to the technical field that exchanges the flexible transmission technology.Be that class employing variable impedance transformer is the series active power filter of series coupled transformer specifically.
Background technology
The increase day by day of electric power system scale, short circuit current numerical value also increase thereupon, and short trouble is also increasing to the harm of system.Based on the solid-state short-circuit fault current limiter of the bridge-type of power electronic technology after detecting short trouble and taking place; impedance parameter by quick change faulty line; short circuit current is limited in the level of permission,, has become one of key element of flexible AC transmitting system with the protection power equipment.Flow restricter is a kind of large-capacity power device, volume, weight, cost are bigger, but reason because of its function, special flow restricter only works in the short time at the utmost point that short trouble takes place, under the normal condition that accounts for most running times, flow restricter is in " preparation " state, and utilization rate of equipment and installations is very low, is a kind of waste to a certain extent.
Along with the continuous development and the extensive utilization of power electronic equipment in electric power system of power electronic technology, the harmonic problem in the electric power system becomes increasingly conspicuous, and for system and device security thereof, stable operation, it is more and more important that harmonic wave control becomes.Active Power Filter-APF can effectively compensate each harmonic, and is not subjected to influence on system parameters, thereby becomes the main direction of studying that Harmonious Waves in Power Systems is administered.The relative parallel connection type of serial active filter is more suitable for bucking voltage type harmonic source.(typical circuit is the rectification circuit that DC side contains big capacitor filtering along with the voltage-type harmonic load, as power electronic equipments such as frequency converter, Switching Power Supply, UPS and electric ballasts) use increasing, it is more and more important that serial active filter just seems.Under normal circumstances; series active power filter is according to detected voltage harmonic; circuit voltage is carried out harmonic compensation; when short trouble takes place, do not having under the situation of current limiting measures, the secondary of a very big short circuit current through over-coupled transformer will be arranged; thereby the primary current of coupling transformer and the output current of voltage source inverter are sharply increased; series active power filter is produced impact, so series active power filter needs a cover reliable protection circuit.Because series active power filter inserts electrical network by a coupling transformer series connection, inject the controllable voltage Vc of a series connection to circuit, when this voltage is anti-phase harmonic voltage, can realize series active filtering, when the system of detecting was short-circuited fault, it was anti-phase to control series voltage Vc and supply voltage, to reduce short circuit current, so on the circuit topology and control principle of series active power filter, it is the potentiality with short circuit current restriction.If design a kind of series active power filter with short circuit current limitation function, under the normal situation of system, be used for realizing active power filtering, improve the voltage waveform quality, and when short trouble takes place, can be automatically, the rising of limiting short-circuit current effectively, just can save the special short circuit current limitation device of a cover, not only can reduce investment outlay, can also improve the reliability of series active power filter.
Under such thinking and background, the utility model proposes a kind of series active power filter just with short circuit current limitation function.
The utility model content
The main circuit structure of series active power filter, as shown in Figure 1, by control Vc, make its when short trouble takes place and supply voltage anti-phase, short circuit current is reduced to some extent, but because the amplitude of Vc is compared very little with the supply voltage amplitude, metering function is very little, improving the Vc amplitude, the capacity of the capacity of the voltage source inverter of series active power filter and energy-storage travelling wave tube need be improved a lot, in fact is unrealistic, uneconomic.
If coupling transformer adopts special design, make at line current during greater than nominal load current, the magnetic circuit of coupling transformer enters the zone of saturation, thereby the leakage flux of coupling transformer and leakage inductance are increased greatly, when the leakage inductance of coupling transformer is enough big, series active power filter has just had the current-limiting function under the short trouble state, can strengthen the function of series active power filter so greatly, improves its reliability.Suppose that the line impedance before the short dot is Z
1, supply voltage is Vs, and the output voltage of series active power filter is Vc, and the leakage inductance of coupling transformer is L
1, then the numerical value of short circuit current is:
Line impedance Z wherein
1Numerical value very little, can ignore, the amplitude of the phasor difference of supply voltage and compensator output voltage is near the amplitude of supply voltage, so, under the given situation of supply voltage, the mainly leakage inductance decision after saturated of the size of short circuit current by the magnetic circuit of coupling transformer.
The purpose of this utility model is to strengthen the function of existing series active power filter, and the potential short circuit current limitation function of exploitation series active power filter is to improve the reliability of whole system.
A kind of series active power filter with short circuit current limitation function of the present invention comprises that coupling transformer Tr1, the voltage source inverter, energy storage capacitor C1, the output inductor L1 that are made up of turn-off device T1-T4 form; Wherein, storage capacitor C1 is connected on the direct current input side of voltage source inverter; After the interchange output process output inductor L1 filtering of voltage source inverter, be added in the former limit of coupling transformer, the secondary series connection of coupling transformer is on the circuit between AC power and the load; Described coupling transformer is the impedance coupling transformer with overcurrent magnetic circuit saturation characteristic, is a kind of at electric current during greater than nominal load current, and magnetic circuit enters the impedance coupling transformer of saturation condition.
The utility model both can be single-phase, also can be three-phase.
These characteristics with series active power filter of short circuit current limitation function are, under the normal situation of system, impedance coupling transformer magnetic circuit is unsaturated, leakage inductance is very little, this series active power filter is used for system is carried out the harmonic voltage compensation, when short trouble takes place, load impedance becomes suddenly near zero, the output voltage of series active power filter also has little time to change, the phasor difference of the output voltage V c of supply voltage Vs and series active power filter is added in line impedance, on the leakage inductance of impedance coupling transformer and the secondary winding, thereby cause the increase of secondary current, after electric current surpasses the circuit rated current of setting, impedance coupling transformer magnetic circuit is saturated, and leakage inductance and impedance increase, and play the effect of limiting short-circuit current.
This utility model device can be automatically, the rising of limiting short-circuit current effectively when short trouble takes place, thereby saved the special short circuit current limitation device of a cover, can reduce investment outlay.
Description of drawings
Fig. 1, for the utlity model has series active power filter (single-phase) schematic diagram of short circuit current limitation function;
Fig. 2, for the utlity model has series active power filter (three-phase) schematic diagram of short circuit current limitation function.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Embodiment 1: as shown in Figure 1, be single-phase series active power filter, comprise that the impedance coupling transformer Tr1 with overcurrent magnetic circuit saturation characteristic, voltage source inverter, energy storage capacitor C1, the output inductor L1 etc. that are made up of turn-off device T1-T4 form with short circuit current limitation function.Wherein, storage capacitor C1 is connected on the direct current input side of the voltage source inverter of being made up of T1-T4; After interchange output process filtering inductance L 1 filtering of voltage source inverter, be added in the former limit of the impedance coupling transformer with overcurrent magnetic circuit saturation characteristic, the secondary series connection of impedance coupling transformer is on the circuit between AC power and the load.Three separate single-phase have the series active power filter of short circuit current limitation function, be applied to three-phase system, can form the series active power filter that a three-phase has the short circuit current limitation function, advantage is not only to be applicable to symmetrical system, also be applicable to the asymmetric three-phase system of load, shortcoming is that main circuit components and parts number is many, and cost is higher.
The series active power filter that embodiment 2 has the short circuit current limitation function for the three-phase of the utility model cramped construction, comprise three-phase impedance coupling transformer Tr, form three-phase voltage source inverter, storage capacitor C1 by turn-off device T1-T6 with overcurrent magnetic circuit saturation characteristic, compositions such as three-phase filter inductance L1 are shown in the inner branch of frame of broken lines among Fig. 2.Va, Vb, Vc are three-phase mains voltage among the figure, and Lx1 is a line inductance, and Z is the three-phase nonlinear load.Storage capacitor C1 is connected on the DC side of three-phase voltage source inverter, behind the interchange output process three-phase filter inductance L1 of three-phase voltage source inverter, be connected on the former limit of the three-phase impedance coupling transformer of star-like connection, three secondary of three-phase impedance coupling transformer are connected on respectively on the power supply and the circuit between the load in the three-phase system.
Claims (3)
1, a kind of series active power filter with short circuit current limitation function comprises coupling transformer, voltage source inverter, energy storage capacitor, output inductor composition; Wherein, storage capacitor is connected on the direct current input side of voltage source inverter; After the interchange output process output inductor filtering of voltage source inverter, be added in the former limit of coupling transformer, the secondary series connection of coupling transformer is on the circuit between AC power and the load; It is characterized in that: described coupling transformer is the impedance coupling transformer with overcurrent magnetic circuit saturation characteristic.
2, according to the described series active power filter with short circuit current limitation function of claim 1, it is characterized in that: described impedance coupling transformer, voltage source inverter, output inductor with overcurrent magnetic circuit saturation characteristic is single-phase.
3, according to the described series active power filter with short circuit current limitation function of claim 1, it is characterized in that: described impedance coupling transformer, voltage source inverter, output inductor with overcurrent magnetic circuit saturation characteristic is three-phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200696485U CN2882074Y (en) | 2006-02-27 | 2006-02-27 | Series active filter with short-circuit current-limit function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200696485U CN2882074Y (en) | 2006-02-27 | 2006-02-27 | Series active filter with short-circuit current-limit function |
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|---|---|
| CN2882074Y true CN2882074Y (en) | 2007-03-21 |
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| CNU2006200696485U Expired - Fee Related CN2882074Y (en) | 2006-02-27 | 2006-02-27 | Series active filter with short-circuit current-limit function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097794A (en) * | 2011-02-21 | 2011-06-15 | 山东大学 | Device and method for limiting short circuit current by utilizing saturation characteristics of transformer |
| CN113315127A (en) * | 2021-05-31 | 2021-08-27 | 上海蓝瑞电气有限公司 | Filter circuit of active power filter |
-
2006
- 2006-02-27 CN CNU2006200696485U patent/CN2882074Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097794A (en) * | 2011-02-21 | 2011-06-15 | 山东大学 | Device and method for limiting short circuit current by utilizing saturation characteristics of transformer |
| CN113315127A (en) * | 2021-05-31 | 2021-08-27 | 上海蓝瑞电气有限公司 | Filter circuit of active power filter |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |