CN201975771U - Multi-converter type uniform power quality adjusting device in electric distribution system - Google Patents
Multi-converter type uniform power quality adjusting device in electric distribution system Download PDFInfo
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- CN201975771U CN201975771U CN2010206909918U CN201020690991U CN201975771U CN 201975771 U CN201975771 U CN 201975771U CN 2010206909918 U CN2010206909918 U CN 2010206909918U CN 201020690991 U CN201020690991 U CN 201020690991U CN 201975771 U CN201975771 U CN 201975771U
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Abstract
The utility model provides a multi-converter type uniform power quality adjusting device in an electric distribution system, which mainly comprises current-limiting inductors, transformers and connecting inductors; according to different situations that a load of a three-phase distributing line is in a nonlinear rectification mode or a resistance mode, the device respectively comprises two parallel voltage source converters and a series voltage source converter; and the current-limiting inductors are respectively connected with a solid-state switch in parallel for the device to switch among different operational modes. The device integrates a failure current limiter, a dynamic voltage restorer and an active power filter, limits short-circuit current and offset voltage dip by the series converter, and restrains current harmonics by the parallel converters. When the device is used as the failure current limiter to operate, active power is not consumed, the advantage of energy conservation is realized, not only can the power supply voltage requirement of different loads be met, but also the nonlinear load can be effectively prevented from polluting the system, and the short-circuit current standard of the line is lowered while the power quality is improved, and a foundation is laid for internetworking.
Description
Technical field:
The utility model relates to a kind of electric device that is used to connect many distribution lines and each circuit quality of power supply of comprehensive adjustment, belongs to power transmission and distribution device field.
Background technology:
Electric energy is current social indispensable important energy source, and it uses most convenient, and the scope of application is the most extensive.Power quality problem has been not only basic fundamental such as voltage and frequency problem in the electric power system; it is related to safe, stable, economy, the reliability service of whole electric power system and equipment; concern the electric circumstance engineering protection, concern the overall benefit and the development strategy of whole national economy.Under the electricity market condition, user and power supply enterprise are all in the maximum benefit of pursuing oneself.The user can propose to satisfy the electric energy of the different quality of needs separately, the personalization of electricity consumption occurs.Power department not only will satisfy the user to the ever-increasing demand of electric weight like this, also must satisfy the diversity requirement of user to the quality of power supply.
Unified electric energy regulator (Unified Power Quality Conditioner) is as the comprehensive and development of dynamic electric voltage adjuster and Active Power Filter-APF, can better solve the problems of the quality of power supply, have high theoretical research and practical value.At present, unified electric energy regulator mainly is made up of two converters, parallel inverter and series connection converter, shared one group of dc capacitor.Wherein, parallel inverter is mainly used in the inhibition current harmonics, and the series connection converter mainly carries out voltage compensation, keeps supply power voltage stable.But the quality of power supply develops into today, and research range not only is confined to harmonic compensation, a big problem of short circuit current restriction also becoming quality of power supply research.At present, fault current limiter is the usual means that suppresses the line short circuit current level, and its topological structure varies, such as the parallel resonance formula failure current limit that patent CN101609982A proposes, and the three-phase fault flow restricter that patent CN101707365A proposes etc.The external series connection VSC serial connection current-limiting inductance that proposes is used as fault current limiter, and effect is also fine.Aspect the control of many circuit trends, flow controller between line (IPFC) and universal THE UPFC (GUPFC) are furtherd investigate, are used for transmission line mostly, and electric pressure is higher, and are not suitable for carrying out quality of power supply adjusting.
Many converters formula is unified electric energy regulator and is adopted three or three above converter structures, and the shared one group of electric capacity of DC side can be according to the type and the number of system's needs selection converter, flexible configuration.Dynamic electric voltage is recovered, and functions such as failure current limit and active power filtering are dissolved into many converters formula and are unified electric energy regulator and can improve installation cost and operational efficiency greatly.
The utility model content
Technical problem to be solved of the present utility model provides in a kind of distribution system many converters formula and unifies quality of power supply adjusting device, has failure current limit, and dynamic electric voltage recovers, functions such as active power filtering, the quality of power supply that can two distribution lines of comprehensive adjustment.
The utility model is for realizing that above-mentioned utility model purpose adopts following technical scheme:
Many converters formula is unified quality of power supply adjusting device in a kind of distribution system, and described distribution system comprises N bar three-phase distribution circuit, and N is natural number and N 〉=2,
1), when the load of a three-phase distribution circuit is a non-linear rectification load and during for sensitive load, described quality of power supply adjusting device comprises first voltage source converter, is connected inductance with 6 with second voltage source converter, 3 current-limiting inductances that are parallel with solid-state switch respectively, 3 transformers that first voltage source converter is in parallel; Wherein, the two ends of described first voltage source converter 2 electric capacity of connecting mutually in parallel; Described 3 current-limiting inductances, 3 transformers, 6 connection inductance on average are arranged on respectively on the every phase line of described three-phase distribution circuit;
In every phase line, an end of described current-limiting inductance is connected with mains side, and the other end of described current-limiting inductance is connected with an end of the former limit of transformer winding, and the other end of the former limit of described transformer winding is connected inductance respectively with first an end, load-side are connected; One end of described transformer secondary winding is connected with the three-phase brachium pontis of first voltage source converter be connected the inductance serial connection with second after; The other end of described transformer secondary winding connects with the mid point that is connected of described 2 electric capacity of connecting mutually; Described first other end that connects inductance is connected with the three-phase brachium pontis of second voltage source converter;
2), when the load of a three-phase distribution circuit only was sensitive loads, described quality of power supply adjusting device comprised that 1 series-type voltage source converter, 3 are parallel with the current-limiting inductance of solid-state switch, 3 transformers, 3 respectively and connect inductance;
Wherein, the two ends of described voltage source converter 2 electric capacity of connecting mutually in parallel; Described 3 current-limiting inductances, 3 transformers, 3 connection inductance on average are arranged on respectively on the every phase line of described three-phase distribution circuit;
In every bus, an end of described current-limiting inductance is connected with mains side, and the other end of described current-limiting inductance is connected with an end of the former limit of transformer winding, and the other end of the former limit of described transformer winding is connected with load-side; One end of described transformer secondary winding be connected inductance serial connection after, be connected with the three-phase brachium pontis of voltage source converter; The other end of described transformer secondary winding connects with the mid point that is connected of described 2 electric capacity of connecting mutually.
Further, many converters formula is unified quality of power supply adjusting device in the above-mentioned distribution system, and wherein voltage source converter adopts full-control type device IGBT, and the inverse parallel diode.
Further, many converters formula is unified quality of power supply adjusting device in the above-mentioned distribution system, and wherein solid-state switch is the high-power controllable devices of GTO.
The utility model adopts technique scheme to have following beneficial effect:
(1) device can connect many distribution lines, and the quality of power supply of many circuits is carried out Comprehensive Control.Wherein a class distribution line adopts series connection and parallel inverter, and another kind of distribution line adopts series electrical potential source converter.Series electrical potential source converter can carry out failure current limit and dynamic electric voltage recovers, and relies on solid-state switch to carry out mode switch.
(2) utilize series electrical potential source converter to carry out fault current restriction and dynamic electric voltage recovery, utilize solid-state switch that device is switched between current-limit mode, standby mode and moving complementary modulus formula.When running on current-limit mode and standby mode, solid-state switch is opened, and device runs on when moving the complementary modulus formula, the solid-state switch closure.All do not consume active power, have only idle output.
When circuit did not have the short trouble generation, device ran on standby mode, detects fault current-limit mode takes place to switch to immediately, switched to moving complementary modulus formula when electric voltage dropping or distortion take place, and switching rapidly accurately;
(3) function of having integrated dynamic electric voltage recovery device, fault current limiter and Active Power Filter-APF is in one, one-machine-multi-function, and controlled target is various;
When (4) short trouble took place, the converter output voltage can be regulated according to the short circuit current level of system's needs, thereby short-circuit current value is limited in certain scope.When device is controlled to be the fault current limiter operation, do not consume active power, possess energy-saving advantages.
Description of drawings:
Fig. 1 is an electrical schematics of the present utility model.
Fig. 2 is the utility model wiring schematic diagram in electric power system.
Fig. 3 is that the utility model is applied in the tandem type converter structure figure in the phase three-wire three distribution line.
Fig. 4 is the structure chart that the utility model is applied in the parallel connection type converter in the phase three-wire three distribution line.
Fig. 5 is the series connection converter fundamental diagram in the utility model.
Fig. 6 is the utility model analogous diagram when using as fault current limiter.Wherein Fig. 6 (a) is a device when standby mode and current-limit mode switch, and current-limiting inductance voltage and converter output voltage waveform, Fig. 6 (b) are devices when standby mode and moving complementary modulus formula are switched, current-limiting inductance and converter output voltage waveform.
Fig. 7 is the utility model power loss analogous diagram when using as fault current limiter.
Specific embodiments:
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
With reference to Fig. 1 and shown in Figure 3, voltage source converter adopts full-control type device IGBT, and the inverse parallel diode, and the DC side energy storage device adopts two group capacitor C
1And C
2, the capacitor mid point is as three groups of common ports that connect transformer.Connection inductance L among Fig. 3 has been omitted the high pass filter that is used near the harmonic wave of filtering switching frequency near system side.Current-limiting inductance L
1With solid-state switch K
1Parallel connection, wherein, solid-state switch is used for device and switches between different working modes.Expression for convenience, Fig. 1 represents with a phase line that with the three-phase brachium pontis of three-phase distribution circuit and converter the detailed structure view of tandem type and parallel connection type converter is referring to Fig. 3 and shown in Figure 4.
With reference to Fig. 2, system powers to sensitive load by two wiring line, and wherein circuit 1 is non-linear rectification load, and the system power harmonic wave is comparatively obvious, and circuit 2 is an ohmic load, only is sensitive load.Three voltage source converters dispose according to Fig. 1 mode according to loading condition, and Fig. 2 has omitted current-limiting inductance and the solid-state switch that links to each other with the series connection converter.
Provide the function implementation method of series connection converter in conjunction with Fig. 3 and Fig. 5 as dynamic electric voltage adjuster and fault current limiter.With converter 1 is example, and when normally moving, the series connection converter uses as fault current limiter, and two kinds of mode of operations are arranged, i.e. standby mode and current-limit mode, K switch at this moment
1Open.Standby mode is at circuit operational mode under voltage distortion and the short trouble state not to take place, current-limit mode is an operational mode of short duration when circuit is short-circuited fault, in a single day fall and dynamic electric voltage takes place, solid-state switch is closed immediately, device switches to moving complementary modulus formula operation, and bucking voltage is fallen and distortion.
Fig. 4 is the structure chart of parallel connection type converter, and detection algorithm adopts the detection algorithm based on instantaneous reactive power theory, and control algolithm adopts the hysteresis current tracking Control.
As shown in Figure 5, device is as the fault current limiter operation, and series connection VSC is modulated into controlled voltage source.Under standby mode, series connection VSC output voltage compensation L
1The drop of pressure that powers on, promptly
At this moment, circuit top voltage and end voltage equate, have
On series connection VSC, do not produce the voltage landing; Under current-limit mode, modulation series connection VSC output voltage and current-limiting inductance voltage landing same-phase, thus make VSC performance inductance characteristic, reduce fault current.This moment the output voltage limiting value, promptly the size of limiting voltage ring is subjected to dc capacitor voltage height and device withstand voltage level affects.System can select the V of output according to different needs
sAmplitude, but its phase place should be identical with current-limiting inductance voltage.In control procedure, idle flowing only arranged, there is no meritorious consumption, dc voltage can not fluctuate because of the switching of pattern, so DC side can adopt electric capacity as energy-storage travelling wave tube.Simultaneously, under the normal condition, suppose that circuit is pure perception, when series connection VSC works in standby mode, also do not consume active power, energy-saving advantages is arranged.
Shunt voltage source converter is used to suppress the current harmonics that nonlinear-load injects to system, dc voltage adopts PI control, when the series connection side needs bucking voltage to fall, dc capacitor voltage provides the active power support for it, at this moment, capacitance voltage reduces, and the capacitance voltage reduction directly causes exchanging and DC side power imbalance, and active power will be that AC side flows to the dc capacitor side from system side.See on the whole, also promptly when the series connection and the active power of parallel inverter are uneven, will cause flowing of active power, alternating current-direct current side power is tended to balance.
With reference to Fig. 6 simulation waveform, wherein (a) is that device is when standby mode and current-limit mode switching, current-limiting inductance voltage and converter output voltage waveform are devices when standby mode and moving complementary modulus formula are switched (b), current-limiting inductance and converter output voltage waveform.When device runs on standby mode, K switch
1Be in open mode, the converter output voltage equates with the current-limiting inductance voltage swing, 180 ° of phase phasic differences, when having detected the fault generation, device switches to current-limit mode rapidly, converter output voltage phase place is identical with the current-limiting inductance voltage-phase, and choosing of amplitude needs according to the line short circuit current level, shown in figure (a).When detecting the electric voltage dropping generation under the standby mode, device switches to moving complementary modulus formula, K switch rapidly
1Rapid closing, with the current-limiting inductance short circuit, converter output voltage compensation system voltage falls, shown in figure (b).As can be seen, the device mode switch is rapid, precise control.
With reference to Fig. 7 simulation waveform, when device uses as fault current limiter, do not consume active power, have only idle output, device has energy-saving advantages.
Claims (3)
1. many converters formula is unified quality of power supply adjusting device in the distribution system, and it is characterized in that: described distribution system comprises N bar three-phase distribution circuit, and N is natural number and N 〉=2,
1), when the load of a three-phase distribution circuit is a non-linear rectification load and during for sensitive load, described quality of power supply adjusting device comprises first voltage source converter, is connected inductance with 6 with second voltage source converter, 3 current-limiting inductances that are parallel with solid-state switch respectively, 3 transformers that first voltage source converter is in parallel; Wherein, the two ends of described first voltage source converter 2 electric capacity of connecting mutually in parallel; Described 3 current-limiting inductances, 3 transformers, 6 connection inductance on average are arranged on respectively on the every phase line of described three-phase distribution circuit;
In every phase line, an end of described current-limiting inductance is connected with mains side, and the other end of described current-limiting inductance is connected with an end of the former limit of transformer winding, and the other end of the former limit of described transformer winding is connected inductance respectively with first an end, load-side are connected; One end of described transformer secondary winding is connected with the three-phase brachium pontis of first voltage source converter be connected the inductance serial connection with second after; The other end of described transformer secondary winding connects with the mid point that is connected of described 2 electric capacity of connecting mutually; Described first other end that connects inductance is connected with the three-phase brachium pontis of second voltage source converter;
2), when the load of a three-phase distribution circuit only was sensitive loads, described quality of power supply adjusting device comprised that 1 series-type voltage source converter, 3 are parallel with the current-limiting inductance of solid-state switch, 3 transformers, 3 respectively and connect inductance;
Wherein, the two ends of described voltage source converter 2 electric capacity of connecting mutually in parallel; Described 3 current-limiting inductances, 3 transformers, 3 connection inductance on average are arranged on respectively on the every phase line of described three-phase distribution circuit;
In every bus, an end of described current-limiting inductance is connected with mains side, and the other end of described current-limiting inductance is connected with an end of the former limit of transformer winding, and the other end of the former limit of described transformer winding is connected with load-side; One end of described transformer secondary winding be connected inductance serial connection after, be connected with the three-phase brachium pontis of voltage source converter; The other end of described transformer secondary winding connects with the mid point that is connected of described 2 electric capacity of connecting mutually.
2. many converters formula is unified quality of power supply adjusting device in the distribution system according to claim 1, it is characterized in that: described voltage source converter adopts full-control type device IGBT, and the inverse parallel diode.
3. many converters formula is unified quality of power supply adjusting device in the distribution system according to claim 1, it is characterized in that: described solid-state switch is the high-power controllable devices of GTO.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206909918U CN201975771U (en) | 2010-12-30 | 2010-12-30 | Multi-converter type uniform power quality adjusting device in electric distribution system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206909918U CN201975771U (en) | 2010-12-30 | 2010-12-30 | Multi-converter type uniform power quality adjusting device in electric distribution system |
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| CN201975771U true CN201975771U (en) | 2011-09-14 |
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| CN2010206909918U Expired - Lifetime CN201975771U (en) | 2010-12-30 | 2010-12-30 | Multi-converter type uniform power quality adjusting device in electric distribution system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097793A (en) * | 2010-12-30 | 2011-06-15 | 东南大学 | Multi-current converter unified power quality conditioning device for power distribution system |
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2010
- 2010-12-30 CN CN2010206909918U patent/CN201975771U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097793A (en) * | 2010-12-30 | 2011-06-15 | 东南大学 | Multi-current converter unified power quality conditioning device for power distribution system |
| CN102097793B (en) * | 2010-12-30 | 2013-05-08 | 东南大学 | Multi-current converter unified power quality conditioning device for power distribution system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110914 Effective date of abandoning: 20130508 |
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| RGAV | Abandon patent right to avoid regrant |