CN203574369U - Capacitor type distribution network power quality comprehensive compensator - Google Patents
Capacitor type distribution network power quality comprehensive compensator Download PDFInfo
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- CN203574369U CN203574369U CN201320721611.6U CN201320721611U CN203574369U CN 203574369 U CN203574369 U CN 203574369U CN 201320721611 U CN201320721611 U CN 201320721611U CN 203574369 U CN203574369 U CN 203574369U
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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
- Y02E40/30—Reactive power compensation
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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 a capacitor 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 capacitor type distribution network power quality comprehensive compensator comprises a reactor, a current transformer, a star connection capacitor group, an angle connection capacitor group 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 capacitor type distribution network power quality comprehensive compensator also comprises a zero sequence current shunt used for regulating the flow direction of zero sequence current. The zero sequence current shunt, the star connection capacitor group and the angle connection capacitor group are connected in parallel and are connected to a power distribution system. The two capacitor groups are respectively provided with a composite switch. The controller is connected with each composite switch. According to the capacitor type distribution network power quality comprehensive compensator, through the control of the switching of capacitance and the function of nearly short circuit of the zero sequence current by the zero sequence current shunt, the zero sequence current of the transformer is small, 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 capacitor 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.
Summary of the invention
For addressing the above problem, the utility model provides a kind of capacitor type distribution network electric energy quality general compensator, can effectively control three-phase imbalance, and eliminates neutral zero-sequence current and high order harmonic component.
The technical solution adopted in the utility model is as follows: a kind of capacitor type distribution network electric energy quality general compensator, comprise the reactor of being located between main transformer and load, current transformer, star connects capacitor group, corner connection capacitor group and controller, reactor is connected on the neutral line, current transformer is connected on three-phase firewire, also comprise that one for regulating the zero-sequence current shunt of the zero-sequence current flow direction, zero-sequence current shunt and star connect capacitor group, corner connection capacitor group access in parallel distribution system, two group capacitors are respectively equipped with combination switch, controller is connected with each combination switch.Current transformer is used for gathering three-phase current signal and sends to controller, and controller is by controlling the switching of the Closed control electric capacity of combination switch.
Because three-phase imbalance electric current can be decomposed into positive sequence, negative phase-sequence and zero-sequence current, zero-sequence current is offset by zero-sequence current shunt.Most of load is resistance inductive load, controller gathers A from current transformer, B, C three-phase current size and phase angle, calculate together with voltage parameter, target component is power factor and three-phase balance rate, adopting a system perception is inductance, the capacitance of capacitor comes the Mathematical Modeling of equilibrium establishment and capacitance compensation to derive, derive at AB, BC, AC, AO, BO, the electric capacity number dropping between CO, control combination switch and realize the object of eliminating negative-sequence current, thereby the electric current that makes to enter transformer is forward-order current, reach three-phase equilibrium and power factor and be 1 object.
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.
In said apparatus, 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 transformer, 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.
Further, described combination switch consists of magnetic retainer and electronic ac switch, adopts magnetic latching relay marshalling.Can realize capacitor can be connected arbitrarily at phase and phase and between with zero, and can complete operating passing zero, has not only reached and has fully utilized neatly the function of capacitor, has also effectively reduced the power consumption that installs self simultaneously.
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.The combination switch of this controller and the marshalling of energy intelligence adopt 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 organizational systems of compensation capacity and the capacitor of compensator to the Measurement accuracy of meritorious unbalance condition and reactive load amount and calculating, control strategy, and be aided with and move the setting at interval, so device there will not be underloading throw in-of oscillation phenomenon.
The utility model is close to the function of short circuit according to the switching of target control algorithm control capacitance amount and zero-sequence current shunt to zero-sequence current; 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, the first combination switch, the 7, second combination switch, 8, star connects capacitor group, 9, corner connection capacitor group, 10, zero-sequence current shunt, 11, A post, 12, B post, 13, C post, the 14, first winding, 15, the second winding, 16, the tertiary winding.
Embodiment
A kind of capacitor type distribution network electric energy quality general compensator, as shown in Figure 1, comprise reactor 5, current transformer 2, zero-sequence current shunt 10, star connects capacitor group 8, corner connection capacitor group 9, 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, zero-sequence current shunt 10 is for regulating zero-sequence current to flow to, minimizing is by the zero-sequence current of main transformer, itself and star connect capacitor group 8, corner connection capacitor group 9 access distribution system in parallel, star connects capacitor group 8 and is provided with the first combination switch 6, and corner connection capacitor group 9 is provided with the second combination switch 7, and controller 4 is connected with two combination switches, by controlling the switching of the Closed control electric capacity of combination switch.Two combination switches consist of magnetic retainer and electronic ac switch.Described zero-sequence current shunt 10 comprises one " saying " font iron core and three armature windings, iron core comprises A post 11, B post 12,13 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 14 is around the outside of A post 11, rear end coil is around the inner side of B post 12, and its stem is connected with A phase firewire.The front end coil of the second winding 15 is around the outside of B post 12, and rear end coil is around the inner side of C post 13, and its stem is connected with B phase firewire.The front end coil of the tertiary winding 16 is around the outside of C post 13, and rear end coil is around the inner side of A post 11, 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.
Distribution system packs into after said apparatus, and running is as follows:
1, system three-phase equilibrium, and without high order harmonic component
Zero-sequence current shunt is not worked, and capacitive part only plays intelligent capacitor compensating action, more than making system power factor compensation to 0.98.
2, system three-phase equilibrium, has high order harmonic component.
High order harmonic component positive-negative sequence on zero line is cancelled out each other, and zero sequence high order harmonic component is stack.Therefore, on zero line, zero sequence higher harmonic current is larger, and zero sequence higher harmonic current is divided into three parts from zero-sequence current shunt and flows to A, B, C three-phase, because of equal and opposite in direction, and opposite direction, zero sequence high order harmonic component is cancelled out each other, thereby eliminates zero sequence high order harmonic component.
Capacitive part only plays intelligent capacitor compensating action in the case.
3, system three-phase imbalance
In this situation, zero-sequence current is larger, and zero-sequence current is divided into three parts by zero-sequence current shunt and flows to A, B, C three-phase, in A, B, C three-phase, offsets.Three characteristics of the middle term uncompensated load electric current can be decomposed into forward-order current component, negative-sequence current component and zero-sequence current component.Zero-sequence current component is offset by zero-sequence current shunt, so only remaining positive-negative sequence current component.Because load major part is resistance sense mixed type, and pure resistance type and capacitance-resistance mixed type are less.Therefore most of transformer station can offset negative-sequence current component with electric capacity.Our Mathematical Modeling is exactly to calculate and be divided into the amount of mending electric capacity and offset negative-sequence current by calculating the size of negative sequence component.It is 1 that the electric current that enters like this transformer just only has the forward-order current of balance, the power factor of transformer, and load unbalanced rate is no more than 5%.
Claims (3)
1. a capacitor 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), star connects capacitor group (8), corner connection capacitor group (9) 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 that one for regulating the zero-sequence current shunt (10) of the zero-sequence current flow direction, zero-sequence current shunt (10) connects capacitor group (8) with star, corner connection capacitor group (9) access in parallel distribution system, two group capacitors are respectively equipped with combination switch, controller (4) is connected with each combination switch.
2. capacitor type distribution network electric energy quality general compensator according to claim 1, it is characterized in that: described zero-sequence current shunt (10) 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.
3. capacitor type distribution network electric energy quality general compensator according to claim 1, is characterized in that: described combination switch consists of magnetic retainer and electronic ac switch, adopts magnetic latching relay marshalling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320721611.6U CN203574369U (en) | 2013-06-07 | 2013-11-13 | Capacitor type distribution network power quality comprehensive compensator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320326579.1 | 2013-06-07 | ||
| CN201320326579 | 2013-06-07 | ||
| CN201320721611.6U CN203574369U (en) | 2013-06-07 | 2013-11-13 | Capacitor type distribution network power quality comprehensive compensator |
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| CN203574369U true CN203574369U (en) | 2014-04-30 |
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| CN201320721611.6U Expired - Fee Related CN203574369U (en) | 2013-06-07 | 2013-11-13 | Capacitor type distribution network power quality comprehensive compensator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229983A (en) * | 2016-10-18 | 2016-12-14 | 国网重庆市电力公司电力科学研究院 | A kind of Energy Saving for Distribution Transformer runs system and method |
-
2013
- 2013-11-13 CN CN201320721611.6U patent/CN203574369U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229983A (en) * | 2016-10-18 | 2016-12-14 | 国网重庆市电力公司电力科学研究院 | A kind of Energy Saving for Distribution Transformer runs system and method |
| CN106229983B (en) * | 2016-10-18 | 2019-03-29 | 国网重庆市电力公司电力科学研究院 | A kind of Energy Saving for Distribution Transformer operating system and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170308 Address after: The central Ji'nan city in Shandong Province Yu Hang Road 250000 No. 59 building 6 layer Zichen Patentee after: Ji'nan Luyuan Electric Power Design Consulting Co., Ltd. Address before: 250000 Ji'nan Province Flyover District, No. 2 North Road, No. 86066, No. Patentee before: ELECTRIC POWER ECONOMIC TECHNOLOGY INSTITUTE OF JINAN POWER SUPPLY COMPANY |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20161113 |