CN203574371U - SVG type distribution network power quality comprehensive compensator - Google Patents
SVG type distribution network power quality comprehensive compensator Download PDFInfo
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- CN203574371U CN203574371U CN201320721430.3U CN201320721430U CN203574371U CN 203574371 U CN203574371 U CN 203574371U CN 201320721430 U CN201320721430 U CN 201320721430U CN 203574371 U CN203574371 U CN 203574371U
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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
- Y02E40/40—Arrangements for reducing harmonics
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The utility model relates to the field of a power distribution system and particularly relates to an SVG type distribution network power quality comprehensive compensator capable of coping with three-phase unbalance and eliminating neutral point zero sequence current and higher harmonic wave. The SVG type distribution network power quality comprehensive compensator comprises a reactor, a current transformer and a controller which are arranged between a main transformer and a load. The reactor is connected to a neutral line. The current transformer is connected to a three-phase live line. The SVG type distribution network power quality comprehensive compensator also comprises a static var generator (SVG) and a zero sequence current shunt used for regulating the flow direction of zero sequence current. The zero sequence current shunt and the static var generator are in parallel connection and are connected to a power distribution system. The controller is connected with the static var generator. According to the SVG type distribution network power quality comprehensive compensator, the SVG is directly used to eliminate the zero sequence current, the flow direction of the zero sequence current is regulated through the zero sequence current shunt, thus the zero sequence current of the transformer is small, the negative sequence current is zero, the zero sequence higher harmonic wave is suppressed basically, the three-phase unbalance and the damage of the transformer by the zero sequence current and the higher harmonic wave are effectively eliminated, the electric equipment is protected, and the system loss is reduced.
Description
Technical field
The utility model relates to field of power distribution, is specifically related to a kind of SVG type distribution network electric energy quality general compensator that can tackle three-phase imbalance, eliminate neutral point zero-sequence current and high order harmonic component.
Background technology
Three-phase four-wire system is topmost supply power mode in low-voltage network, and the power consumption equipment in power distribution network mostly be take single-phase load as main.Commercial power be take inductive load as many, and resistive and perceptual mixing in civilian electricity consumption be take resistive as main.Due to power consumption equipment asynchronism, transformer nearly all moves under three-phase imbalance state.The connection set of distribution transformer is generally Dyn11 or Yyn0, during three-phase imbalance, can cause neutral point drift and neutral line zero-sequence current to strengthen, neutral point drift meeting produces the imbalance of three-phase voltage, the phase voltage that general electric current is large is high, when serious, phase voltage can reach 380V, thereby burns power consumption equipment and transformer.Due to the increase of zero-sequence current, can increase the loss of transformer, and produce a large amount of eddy current loss in fuel tank folder, likely burn transformer.And have in power consumption equipment, much can produce high order harmonic component, positive and negative order high order harmonic component can be cancelled out each other at the neutral line, and zero sequence high order harmonic component can superpose at the neutral line, thereby make neutral line high order harmonic component very large, high order harmonic component can have a strong impact on electrical network and transformer generation, the probability that greatly increases line loss and electrical network, transformer and power consumption equipment are damaged.And inductive load and neutral point drift meeting reduce transformer efficiency factor, greatly reduce the efficiency of transformer.
At present having on the market the equipment of a solution three-phase imbalance is the different inputs in AB, AC, BC, AO, BO, CO by capacitor group, by the electric capacity reallocation of gaining merit.This scheme can only be when resistance sense load and the larger load of inductive load effective operation, at inductive load, under little and pure resistive resistance capacitive load, cannot move.
Summary of the invention
For addressing the above problem, the utility model provides a kind of SVG type distribution network electric energy quality general compensator, can effectively control three-phase imbalance, and eliminate neutral zero-sequence current and high order harmonic component.
The technical solution adopted in the utility model is as follows: a kind of SVG type distribution network electric energy quality general compensator, comprise reactor, current transformer and the controller be located between main transformer and load, reactor is connected on the neutral line, current transformer is connected on three-phase firewire, also comprise the zero-sequence current shunt of static reacance generator and for regulating zero-sequence current to flow to, zero-sequence current shunt access in parallel with static reacance generator distribution system, controller is connected with static reacance generator.In this system, utilize static reacance generator SVG to substitute Intelligent capacitor group, by current transformer, gather three-phase current signal and issue controller, by controller analytical calculation negative-sequence current and positive-negative sequence higher harmonic current, by SVG, produce a contrary negative-sequence current and contrary positive-negative sequence high order harmonic component again, negative-sequence current on live wire and positive-negative sequence high order harmonic component are offset, thereby make to only have forward-order current by the electric current of transformer, can reach three-phase equilibrium and power factor and be 1 object.This programme can adapt to all loads, thorough Eliminate highter harmonic, and power saving 15%, further solves the shortcoming that adopts intelligent capacitor compensator.
Described zero-sequence current shunt comprises one " saying " font iron core and three armature windings, and each winding is divided into two coils, respectively on two different stem stems; On each stem stem, have inside and outside two-layer coil, coil winding-direction is identical, equal turn numbers, and the stem of three windings connects respectively A, B, C three-phase firewire, its afterbody common connecting to neutral line that is connected.Armature winding adopts drum type brake.This zero-sequence current shunt is dry impregnation formula, adopts wind cooling.
Zero-sequence current shunt adopts after the above-mentioned mode of connection, and zero-sequence current and positive-negative sequence current flow into coil.Because the phase angle of zero-sequence current is identical, equal and opposite in direction, magnetic flux equal and opposite in direction, phase angle that on each post, two coils produce are identical, opposite direction, thereby make resultant flux, are 0.Due to A, B, C three-phase zero-sequence current by time do not produce magnetic flux, so impedance is very little.Positive and negative order electric current is when this shunt, and on A post, exterior loop is by A phase current, and interior loop is by C phase current, and because inside and outside coil inflow current is contrary, and phase angle differs 120 degree, and magnetic field is vector superposed.
ф A is total=1.732 ф A
Magnetic flux density increases by 1.732 times, and positive and negative like this order impedance is very large, from positive and negative order side, sees the transformer that is equivalent to a no-load running, by the electric current of shunt, only has very little exciting curent.So most of zero-sequence current and zero sequence high order harmonic component flow back to A, B, C three-phase by zero-sequence current shunt, zero-sequence current is cancelled out each other with former zero-sequence current component after flowing back to live wire, and zero-sequence current inflow transformer not can be eliminated zero-sequence current and the impact of zero sequence high order harmonic component on transformer.
The controller that this device adopts can carry out setting parameter according to the different place capacity in scene, and has the collection of real-time running data and the hold function of integral point service data, can or install communication module additional by serial ports, and all data are reached to background management system.This controller has adopted electromagnetic isolation and photoelectricity isolation design, and the means such as configure hardware dog, software administration, hardware fault-tolerant and software fault-tolerant, meet the requirement of various severe running environment, there is superpower interference free performance, stop malfunction and movement resistance, guarantee device reliability service.This controller is by adopting power increments of change to determine the compensation capacity of compensator to the Measurement accuracy of meritorious unbalance condition and reactive load amount and calculating, control strategy.
The utility model device directly utilizes SVG to eliminate negative-sequence current; and regulate zero-sequence current to flow to by zero-sequence current shunt; make the zero-sequence current of transformer little; negative-sequence current is zero; zero sequence high order harmonic component is able to basic inhibition; effectively eliminate three-phase imbalance and zero-sequence current and the destruction of zero sequence high order harmonic component to transformer, protection power consumption equipment, reduces system loss.
Accompanying drawing explanation
Fig. 1 is system pie graph of the present utility model;
Fig. 2 is the elementary diagram of zero-sequence current shunt;
In figure, 1, main transformer, 2, current transformer, 3, load, 4, controller, 5, reactor, 6, static reacance generator, 7, zero-sequence current shunt, 8, A post, 9, B post, 10, C post, the 11, first winding, the 12, second winding, 13, the tertiary winding.
Embodiment
A kind of SVG type distribution network electric energy quality general compensator, as shown in Figure 1, comprise reactor 5, current transformer 2, zero-sequence current shunt 7, static reacance generator 6, controller 4, above-mentioned device is between main transformer 1 and load 3, wherein reactor 5 is connected on the neutral line, current transformer 2 is connected on three-phase firewire, be used for gathering three-phase current signal and send to controller 4, controller 4 is connected with static reacance generator 6, zero-sequence current shunt 7 is for regulating zero-sequence current to flow to, minimizing is by the zero-sequence current of main transformer, itself and static reacance generator 6 access in parallel distribution system.As shown in Figure 2, described zero-sequence current shunt 7 comprises one " saying " font iron core and three armature windings, iron core comprises A post 8, B post 9,10 3 stem stems of C post, each winding is divided into two coils, respectively on two different stem stems, on each stem stem, there is inside and outside two-layer coil, coil winding-direction on same winding and same stem stem is all identical, inner-outer coil equal turn numbers on same stem stem, concrete, the front end coil of the first winding 11 is around the outside of A post 8, and rear end coil is around the inner side of B post 9, and its stem is connected with A phase firewire.The front end coil of the second winding 12 is around the outside of B post 9, and rear end coil is around the inner side of C post 10, and its stem is connected with B phase firewire.The front end coil of the tertiary winding 13 is around the outside of C post 10, and rear end coil is around the inner side of A post 8, and its stem is connected with C phase firewire.The afterbody of three windings is connected and jointly connects zero line.Armature winding adopts drum type brake.This zero-sequence current shunt is dry impregnation formula, adopts wind cooling.
Claims (2)
1. a SVG type distribution network electric energy quality general compensator, comprise the reactor (5) of being located between main transformer (1) and load (3), current transformer (2) and controller (4), reactor (5) is connected on the neutral line, current transformer (2) is connected on three-phase firewire, it is characterized in that: also comprise the zero-sequence current shunt (7) of static reacance generator (6) and for regulating zero-sequence current to flow to, zero-sequence current shunt (7) and static reacance generator (6) access in parallel distribution system, controller (4) is connected with static reacance generator (6).
2. SVG type distribution network electric energy quality general compensator according to claim 1, it is characterized in that: described zero-sequence current shunt (7) comprises one " saying " font iron core and three armature windings, each winding is divided into two coils, respectively on two different stem stems; On each stem stem, have inside and outside two-layer coil, coil winding-direction is identical, equal turn numbers, and the stem of three windings connects respectively A, B, C three-phase firewire, its afterbody common connecting to neutral line that is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320721430.3U CN203574371U (en) | 2013-06-07 | 2013-11-13 | SVG type distribution network power quality comprehensive compensator |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320326493 | 2013-06-07 | ||
| CN201320326493.9 | 2013-06-07 | ||
| CN201320721430.3U CN203574371U (en) | 2013-06-07 | 2013-11-13 | SVG type distribution network power quality comprehensive compensator |
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| Publication Number | Publication Date |
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| CN203574371U true CN203574371U (en) | 2014-04-30 |
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| CN201320721430.3U Expired - Fee Related CN203574371U (en) | 2013-06-07 | 2013-11-13 | SVG type distribution network power quality comprehensive compensator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207202A (en) * | 2015-09-15 | 2015-12-30 | 湖南大学 | Direct power control method for current negative sequence component restraining under network unbalance |
| CN105990841A (en) * | 2015-04-17 | 2016-10-05 | 长沙理工大学 | Resonant injection type power distribution line three-phase unbalance overvoltage suppression device |
-
2013
- 2013-11-13 CN CN201320721430.3U patent/CN203574371U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105990841A (en) * | 2015-04-17 | 2016-10-05 | 长沙理工大学 | Resonant injection type power distribution line three-phase unbalance overvoltage suppression device |
| CN105990841B (en) * | 2015-04-17 | 2018-09-11 | 长沙理工大学 | Resonant current injection type distribution line three-phase imbalance overvoltage inhibiting apparatus |
| CN105207202A (en) * | 2015-09-15 | 2015-12-30 | 湖南大学 | Direct power control method for current negative sequence component restraining under network unbalance |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20161113 |
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| CF01 | Termination of patent right due to non-payment of annual fee |