CN206452114U - A kind of distribution network electric energy quality comprehensive treatment device - Google Patents
A kind of distribution network electric energy quality comprehensive treatment device Download PDFInfo
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- CN206452114U CN206452114U CN201621033108.1U CN201621033108U CN206452114U CN 206452114 U CN206452114 U CN 206452114U CN 201621033108 U CN201621033108 U CN 201621033108U CN 206452114 U CN206452114 U CN 206452114U
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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 embodiment discloses a kind of distribution network electric energy quality comprehensive treatment device, solves that reactive-load compensation deficiency, three-phase imbalance, harmonic content in current rural area low-voltage distribution network be big, the underproof quality of power supply technical problem of voltage.The utility model embodiment includes：Current Voltage collecting unit, controller, tandem type high-frequency inversion module, parallel connection type high-frequency inversion module；Current Voltage collecting unit input is connected with distribution, Current Voltage collecting unit output end is connected with controller input, the output end of controller first is connected with tandem type high-frequency inversion module input, the output end of controller second is connected with parallel connection type high-frequency inversion module input, and tandem type high-frequency inversion module output end, parallel connection type high-frequency inversion module output end are connected with distribution.
Description
Technical field
The utility model is related to low-voltage distribution network field, more particularly to a kind of distribution network electric energy quality comprehensive treatment device.
Background technology
Currently, the power quality problem in rural low voltage network is mainly reflected in following aspects：
1) reactive-load compensation is not enough.With rural area expanding economy, increasing peasant household has farm machinery and set
It is standby.Such as welding machine, reactor, rectifier, will not only consume larger active power, but also to consume substantial amounts of idle work(
Rate.The reactive power of consumption accounts for the 10%-20% of electric network reactive-load total amount, the asynchronous machine that rural area is largely used, institute
The reactive power of consumption has even accounted for the 60%-80% of the idle total load in rural area.Rural electricity consumption equipment it is supporting, use and manage
The not science of reason, is in underloading or Light Condition using electric equipment, occupies the reactive power of significant proportion, causes rural area electricity
Net power factor is relatively low and quality of voltage is inferior, and power attenuation and electric energy loss are larger.
2) three-phase imbalance.In the city dweller and countryside low-voltage electric distribution network of three-phase four-wire system, user is generally single-phase negative
Lotus or list, three-phase load are mixed, due to asymmetric, the three alternate out-of-balance currents of the unbalanced and system component parameter of load
Objective generally existing；The irregularities and unpredictability of customer charge unbalance condition, cause low-voltage network three-phase simultaneously
The long-term imbalance of load.According to statistics, the current whole nation has more than 85% low-voltage platform area and there is different degrees of three-phase imbalance
Situation.Load three-phase imbalance will bring very big harm to distribution network operation and power consumer, for example, increase low-voltage distribution netting twine
Damage, increase distribution transformer loss, influences it to exert oneself, increases line drop, reduce quality of voltage, influence the normal of power consumer
Electricity consumption etc..
3) harmonic content is big.In rural power grids, thyristor type rectifying installation, converter plant, inflation electric light source and family
Electrical appliance, can produce a certain amount of harmonic wave.There is statistics to show, the harmonic wave produced by rectifying installation accounts for the near of whole harmonic wave
40%, it is maximum harmonic source；Frequency Conversion Theory is usually used in the equipment such as water pump, blower fan, as a result of phase control technology, institute
So that the harmonic wave for containing complicated cost (whole time or gradation) can be produced after the conversion, because converter plant typically has relatively high power, so
Also serious harmonic pollution can be caused to power network；Electric arc furnaces, furnace of calcium carbide can produce harmonic current when heating raw material, through transformer
Triangle connection coil and inject power network, wherein the harmonic wave of mainly 2-7 time, the average 8%-20% up to fundamental wave, maximum
Up to 45%；It is even more common harmonic source to inflate electric light source and household electrical appliance, such as fluorescent lamp, high-pressure sodium lamp, high-pressure mercury lamp and gold
Belong to halide lamp application gas discharge principle to light, its C-V characteristic has obvious nonlinear characteristic；Computer, television set,
The household electrical appliance such as video recorder, dimming lamp, temperature adjustment cooker, micro-wave oven, because of built-in voltage regulating rectifier element, can produce high order to power network
Strange harmonic wave；Electric fan, washing machine, air conditioner contain fractional electric motor, because the change of out-of-balance current can also make waveform change, production
Raw a certain amount of harmonic wave, though this kind of plant capacity is small, quantity is more, is also very important factor in mains by harmonics source.
4) voltage is unqualified.Unqualified voltage is that low-voltage distribution network is the most universal, is also the quality of power supply most paid close attention to by user
Problem.The underproof situation of voltage is divided into low voltage and the higher two kinds of situations of voltage.
A) low voltage.The power quality problem of low-voltage distribution network is mainly reflected in low voltage problem, and it is various electric energy
The comprehensive embodiment of quality problems.When power factor is relatively low, and reactive compensation capacity deficiency causes circuit reactive loss excessive, it can go out
The situation of existing line end user's low voltage；When line load rate is higher, and three-phase load is serious uneven, the abnormal heavy phase of load
The situation of low voltage occurs；Low pressure harmonic wave, voltage flicker is distorted distribution voltage, terminal voltage can be caused relatively low；
Load is big with seasonal fluctuations, and distribution line radius of electricity supply is long, can produce larger line loss, if pressure regulation scarce capacity
Low voltage of terminal temperature difference etc. can be made；
B) voltage is higher.In the wet season, because subregion Development of Small Hydropower is more concentrated, total installation of generating capacity is larger, and
The abundant general economy in region of hydroelectric resources is all undeveloped, and load density is small, and the wet season electric energy that sends of small power station can not be on the spot
It is balanced, causes line end voltage to raise.When three-phase imbalance occurs in platform area transformer, neutral point can be big to load
Phase shift, the big phase voltage of load is reduced, and the small phase voltage of load can then be raised.
The method solved at present, one kind is to expand transformer capacity, the line footpath of distribution line is increased, so as to improve platform area
Power supply capacity, but the investment of this method is big, long in time limit.It is another, it is that power quality controlling device, bag are installed in line end
End increasing apparatus, reactive power compensation device for capacitor etc. are included, this kind of apparatus function is single, volume is big, and degree of regulation is poor, it is difficult to suitable
Should with load variations changing power quality problem.
Utility model content
The utility model embodiment discloses a kind of distribution network electric energy quality comprehensive treatment device, low for solving current rural area
Reactive-load compensation deficiency in press-fitting net, three-phase imbalance, harmonic content are big, the underproof quality of power supply technical problem of voltage.
The utility model embodiment provides a kind of distribution network electric energy quality comprehensive treatment device, including：
Current Voltage collecting unit, controller, tandem type high-frequency inversion module, parallel connection type high-frequency inversion module；
Current Voltage collecting unit input is connected with distribution, Current Voltage collecting unit output end and controller input
Connection, the output end of controller first is connected with tandem type high-frequency inversion module input, the output end of controller second and parallel connection type
High-frequency inversion module input is connected, and tandem type high-frequency inversion module output end, parallel connection type high-frequency inversion module output end are with matching somebody with somebody
Net connection.
Further, Current Voltage collecting unit is three-phase current voltage signal acquisition unit.
Further, three-phase current voltage signal acquisition unit passes through current sensor CT1, current sensor CT2, circuit
A, B, C phase line connection of sensor CT3 and distribution line.
Further, three-phase current voltage signal acquisition unit collection three-phase current voltage signal, and transmitting to controller,
By controller calculation process；
Further, controller calculation process three-phase current voltage signal, output drive signal, driving tandem type high frequency is inverse
Become module and the work of parallel connection type high-frequency inversion module
Preferably, tandem type high-frequency inversion module is connected with parallel connection type high-frequency inversion wired in parallel.
Preferably, tandem type high-frequency inversion module is parallel with isolated DC electric capacity with parallel connection type high-frequency inversion intermodule.
Alternatively, tandem type high-frequency inversion module output end passes through isolating transformer T1, isolating transformer T2, isolation transformation
A, B, C, N line connection of device T3 and distribution line；
Alternatively, A, B, C, N line connection of the output end of parallel connection type high-frequency inversion module and distribution line.
As can be seen from the above technical solutions, the utility model embodiment has advantages below：
The utility model embodiment provides a kind of distribution network electric energy quality comprehensive treatment device, including：Current Voltage is gathered
Unit, controller, tandem type high-frequency inversion module, parallel connection type high-frequency inversion module；Current Voltage collecting unit input is with matching somebody with somebody
Net connection, Current Voltage collecting unit output end is connected with controller input, the output end of controller first and tandem type high frequency
Inversion module input is connected, and the output end of controller second is connected with parallel connection type high-frequency inversion module input, tandem type high frequency
Inversion module output end, parallel connection type high-frequency inversion module output end are connected with distribution.Gathered in the present embodiment by Current Voltage
Unit gathers distribution current and voltage signals, and controller operation control tandem type high-frequency inversion module is in parallel connection type high-frequency inversion module
Output, solves that reactive-load compensation deficiency, three-phase imbalance, harmonic content in current rural area low-voltage distribution network be big, voltage is underproof
Quality of power supply technical problem.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of the distribution network electric energy quality comprehensive treatment device provided in the utility model embodiment
Figure；
Fig. 2 is the structural representation of parallel connection type high-frequency inversion module；
Fig. 3 is the structural representation of tandem type high-frequency inversion module.
Illustrate, 1 Current Voltage collecting unit, 2 controllers, 3 tandem type high-frequency inversion modules, 4 parallel connection type high frequencies are inverse
Change module, 5 drive signal a, 6 drive signal b, 7 drive signal c, 8 drive signal d, isolating transformer T, isolating transformer T2,
Isolating transformer T3, current sensor CT1, current sensor CT2, circuit sensor CT3.
Embodiment
The utility model embodiment discloses a kind of distribution network electric energy quality comprehensive treatment device, solves current rural area low pressure
Reactive-load compensation deficiency, three-phase imbalance, harmonic content be big in distribution, the underproof quality of power supply technical problem of voltage.
Referring to Fig. 1, one of a kind of distribution network electric energy quality comprehensive treatment device provided in the utility model embodiment
Embodiment includes：
Current Voltage collecting unit, controller, tandem type high-frequency inversion module, parallel connection type high-frequency inversion module；
Current Voltage collecting unit input is connected with distribution, Current Voltage collecting unit output end and controller input
Connection, the output end of controller first is connected with tandem type high-frequency inversion module input, the output end of controller second and parallel connection type
High-frequency inversion module input is connected, and tandem type high-frequency inversion module output end, parallel connection type high-frequency inversion module output end are with matching somebody with somebody
Net connection.
Further, Current Voltage collecting unit is three-phase current voltage signal acquisition unit.
Further, three-phase current voltage signal acquisition unit passes through current sensor CT1, current sensor CT2, circuit
A, B, C phase line connection of sensor CT3 and distribution line.
Further, three-phase current voltage signal acquisition unit collection three-phase current signal, and transmitting to controller, by controlling
Device calculation process processed；
Further, controller calculation process three-phase current voltage signal, output drive signal, driving tandem type high frequency is inverse
Become module and the work of parallel connection type high-frequency inversion module
Preferably, tandem type high-frequency inversion module is connected with parallel connection type high-frequency inversion wired in parallel.
Preferably, tandem type high-frequency inversion module is parallel with isolated DC electric capacity with parallel connection type high-frequency inversion intermodule.
Alternatively, tandem type high-frequency inversion module output end passes through isolating transformer T1, isolating transformer T2, isolation transformation
A, B, C, N line connection of device T3 and distribution line；
Alternatively, A, B, C, N line connection of the output end of parallel connection type high-frequency inversion module and distribution line.
A kind of distribution network electric energy quality comprehensive treatment device in the embodiment of the present invention, including three isolating transformers, series connection
Type high-frequency inversion module, parallel connection type high-frequency inversion module, isolation capacitance, three current sensors, and three-phase current three-phase voltage
Signal gathering unit.Tandem type high-frequency inversion module and the connection of parallel connection type high-frequency inversion wired in parallel, tandem type high-frequency inversion mould
Isolated DC electric capacity is parallel between block and parallel connection type high-frequency inversion module.
The ac output end of parallel connection type high-frequency inversion module and A, B, C, N line of distribution line are connected；Tandem type high frequency is inverse
The ac output end for becoming module is connected by A, B, C, N line of three isolating transformers and distribution line respectively.
Power Quality Comprehensive Treatment Device monitors the three-phase current magnitude of voltage in distribution line in real time, and by controller
The arithmetic element in portion calculates harmonic content, tri-phase unbalance factor, power factor and the phase voltage value in circuit.Wherein, control
Device is made up of A/D converting units, digital processing element, memory cell, driver element and man-machine interface.Electric current, voltage acquisition
Unit gathers current and voltage signals in distribution line in real time, inputs to controller A/D converting units, and turns through A/D converting units
Change and transmit to digital processing element, calculation process is carried out by digital processing element.Digital processing element is according to operation result, control
Driver element exports corresponding signal.Memory cell is then responsible for storage current and voltage signals and its corresponding calculation process result.It is man-machine
Interface can show relevant voltage current signal situation in real time.
When the phase voltage value of line end is when outside acceptability limit (198V~235V), controller output drive signal a,
Drive the work of tandem type high-frequency inversion module, tandem type high-frequency inversion module output offset voltage, by corresponding isolation transformation
Device is superimposed upon circuit front end, phase voltage is reached acceptability limit；When the power factor in circuit<When 0.9, controller output driving
Signal b, driving parallel connection type high-frequency inversion module work, parallel connection type high-frequency inversion module output inductive reactive power increases power factor
Greatly；When the tri-phase unbalance factor in circuit>When 15%, controller output drive signal c drives parallel connection type high-frequency inversion module work
Make, parallel connection type high-frequency inversion module output imbalance compensation electric current reduces tri-phase unbalance factor；When the harmonic content in circuit
>When 5%, controller output drive signal d, the module work of driving parallel connection type high-frequency inversion, the output of parallel connection type high-frequency inversion module
Harmonic compensation current, reduces harmonic content；Between tandem type high-frequency inversion module and parallel connection type high-frequency inversion module use every
Isolated from direct current capacitors, the capacitor can also play a part of DC energy storage.
The inventive technique device provided in the embodiment of the present invention is, based on high-frequency power electronic Semiconductor Converting Technology, to collect dynamic reactive
The functions such as compensation, dynamic active filtering, three-phase current unbalance adjustment, frequency stepless pressure regulation are in the low-voltage distribution network electric energy matter of one
Comprehensive treatment device is measured, the device is lightweight due to without using traditional reactor and capacitor, will be provided with small volume, uses
The features such as long lifespan, there is the unrivaled advantage of conventional low distribution network electric energy quality controlling device.
In summary, the utility model embodiment provides a kind of distribution network electric energy quality comprehensive treatment device, including：Electric current
Voltage acquisition unit, controller, tandem type high-frequency inversion module, parallel connection type high-frequency inversion module；Current Voltage collecting unit is defeated
Enter end to be connected with distribution, Current Voltage collecting unit output end is connected with controller input, the output end of controller first and string
Connection type high-frequency inversion module input is connected, and the output end of controller second is connected with parallel connection type high-frequency inversion module input, is gone here and there
Connection type high-frequency inversion module output end, parallel connection type high-frequency inversion module output end are connected with distribution, solve current rural area low pressure
Reactive-load compensation deficiency, three-phase imbalance, harmonic content be big in distribution, the underproof quality of power supply technical problem of voltage.
A kind of distribution network electric energy quality comprehensive treatment device provided by the utility model is described in detail above, it is right
In those of ordinary skill in the art, according to the thought of the utility model embodiment, in specific embodiments and applications
It will change, in summary, this specification content should not be construed as to limitation of the present utility model.
Claims (9)
1. a kind of distribution network electric energy quality comprehensive treatment device, it is characterised in that including：
Current Voltage collecting unit, controller, tandem type high-frequency inversion module, parallel connection type high-frequency inversion module；
The Current Voltage collecting unit input is connected with distribution, the Current Voltage collecting unit output end and the control
Device input is connected, and the output end of controller first is connected with the tandem type high-frequency inversion module input, the control
The output end of device second is connected with the parallel connection type high-frequency inversion module input, the tandem type high-frequency inversion module output end,
The parallel connection type high-frequency inversion module output end is connected with distribution.
2. distribution network electric energy quality comprehensive treatment device according to claim 1, it is characterised in that the Current Voltage collection
Unit is three-phase current voltage signal acquisition unit.
3. distribution network electric energy quality comprehensive treatment device according to claim 2, it is characterised in that the three-phase current voltage
Signal gathering unit by current sensor CT1, current sensor CT2, the A of current sensor CT3 and the distribution line, B,
C phase lines are connected.
4. distribution network electric energy quality comprehensive treatment device according to claim 2, it is characterised in that：
The three-phase current voltage signal acquisition unit gathers three-phase current voltage signal, and transmits to the controller computing
Reason.
5. distribution network electric energy quality comprehensive treatment device according to claim 4, it is characterised in that including：
The controller calculation process three-phase current voltage signal, output drive signal, driving tandem type high-frequency inversion module and
Parallel connection type high-frequency inversion module works.
6. distribution network electric energy quality comprehensive treatment device according to claim 1, it is characterised in that the tandem type high frequency is inverse
Become module to be connected with the parallel connection type high-frequency inversion wired in parallel.
7. distribution network electric energy quality comprehensive treatment device according to claim 6, it is characterised in that the tandem type high frequency is inverse
Become module and be parallel with isolated DC electric capacity with the parallel connection type high-frequency inversion intermodule.
8. distribution network electric energy quality comprehensive treatment device according to claim 1, it is characterised in that
The tandem type high-frequency inversion module output end by isolating transformer T1, isolating transformer T2, isolating transformer T3 with
A, B, C, N line connection of the distribution line.
9. distribution network electric energy quality comprehensive treatment device according to claim 1, it is characterised in that
The output end of the parallel connection type high-frequency inversion module is connected with A, B, C, N line of the distribution line.
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| CN201621033108.1U CN206452114U (en) | 2016-08-31 | 2016-08-31 | A kind of distribution network electric energy quality comprehensive treatment device |
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| CN201621033108.1U CN206452114U (en) | 2016-08-31 | 2016-08-31 | A kind of distribution network electric energy quality comprehensive treatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113346493A (en) * | 2021-04-25 | 2021-09-03 | 西安交通大学 | Optimal scheduling method for power distribution network terminal power quality management cluster system |
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2016
- 2016-08-31 CN CN201621033108.1U patent/CN206452114U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113346493A (en) * | 2021-04-25 | 2021-09-03 | 西安交通大学 | Optimal scheduling method for power distribution network terminal power quality management cluster system |
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