CN207200283U - A kind of distribution network voltage based on low pressure trend string reinforcing method falls compensation circuit - Google Patents
A kind of distribution network voltage based on low pressure trend string reinforcing method falls compensation circuit Download PDFInfo
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- CN207200283U CN207200283U CN201721007547.XU CN201721007547U CN207200283U CN 207200283 U CN207200283 U CN 207200283U CN 201721007547 U CN201721007547 U CN 201721007547U CN 207200283 U CN207200283 U CN 207200283U
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- frequency transformer
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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
Abstract
Simple structure, cost is low, using stable, a kind of good distribution network voltage based on low pressure trend string reinforcing method of effect falls compensation circuit, including an Industrial Frequency Transformer and an AC DC AC current transformers, the AC DC AC current transformers are the back-to-back converters being formed by connecting by AC DC rectification circuits and DC AC inverter circuits, the rectification circuit is the full bridge rectifier connected and composed by insulated gate bipolar transistor IGBT and anti-paralleled diode VD, the inverter circuit is the full bridge inverter connected and composed by insulated gate bipolar transistor IGBT and anti-paralleled diode VD, the rectification circuit outlet side passes through electric capacity of voltage regulation C1It is connected with the inverter circuit input side, the Industrial Frequency Transformer T is connected with the current transformer, and Industrial Frequency Transformer T is simultaneously connected with low-voltage distribution net side.The utility model is applied to voltage when low-voltage network output voltage offsets too low and augmented.
Description
Technical field
The utility model belongs to low-voltage network field, is related to the control of power distribution network output voltage.The utility model is realized
Low pressure trend string reinforcing method carries out distribution network voltage compensation, is one kind low cost, the high reliability voltage compensation electricity of low-voltage network
Road.
Background technology
In recent years, because power load maintains sustained and rapid growth, the 380V low voltage power distribution networks that former contradiction does not protrude are electric
It is in rising trend that pressure falls phenomenon, so as to cause user's terminal voltage not meet electricity consumption requirement.According to quality of voltage professional standard,
The variation of 380V low-voltage networks should be within ± 7%, i.e. 353~406V；For the single-phase users of 220V, variation should
In -10%~+5%, i.e. 198~231V.Variation is beyond when allowing voltage, it may appear that makes the family expenses sensitive to quality of voltage
Electrical equipment, such as air-conditioning, television set, can not normal work, or even the phenomenon being damaged.
To solve the situation of variation, tradition is conventional following scheme：1) capacity of transformer is changed；2) more thread-changing
Road；3) using Power Quality Comprehensive Treatment Device etc..Situation is investigated according to actual, the existing transformer capacity of most area is enough
Meet at this stage with the use in following certain time.If the measure for changing circuit is used, i.e., by increasing the line footpath of circuit, often
The replacing of electric pole can be related to, its cost will greatly increase.Therefore, conventional addition Power Quality Comprehensive Treatment Device is carried out at present
Improve, its topological structure is as shown in Figure 1.Its operation principle：Access point voltage, load current, equipment are obtained by measuring circuit
The signals such as output current, DC capacitor voltage, the reactive component of load current, imbalance point are detected using measurement gained signal
Amount and each harmonic component, here it is the output current reference signal of equipment, and then the digital signal processor root of control system
The PWM control pulses for acting on inverter are calculated according to current reference signal, and the electricity of inverter bridge is driven by control circuit
Sub switch device (IGBT), so as to export corresponding reactive component, unbalanced component and each harmonic component, realize compensation work(
Energy.Simple analysis understands that it has a disadvantage that：1) reactive-load compensation can only be provided, it is impossible to significantly improve because the resistance of pressure-wire route is made
Into the phenomenon of Voltage Drop；2) can not all the period of time cut-in operation；3) to DC bus capacitor and power electronic devices performance requirement
It is high.Therefore flexibility and reliability, the design of high performance voltage compensating device are highly significant.
The content of the invention
The utility model is overcome the deficiencies in the prior art, proposes that one kind is reasonable in design, easy to maintenance, cost is relatively low simultaneously
And can effectively administer the compensation circuit of low-voltage network variation, i.e., it is a kind of to be based on low pressure trend string reinforcing method (Low
Voltage power flow series, LVPFS) distribution network voltage fall compensation circuit.
The technical solution adopted in the utility model includes an Industrial Frequency Transformer and an AC-DC-AC current transformers, its special character
It is that the AC-DC-AC current transformers are the back-to-back converters being formed by connecting by AC-DC rectification circuits and DC-AC inverter circuits,
The rectification circuit is the full-bridge connected and composed by insulated gate bipolar transistor IGBT and anti-paralleled diode VD
Rectification circuit, the inverter circuit are the full-bridges connected and composed by insulated gate bipolar transistor IGBT and anti-paralleled diode VD
Inverter circuit, the rectification circuit outlet side pass through electric capacity of voltage regulation C1It is connected with the inverter circuit input side, the power frequency becomes
Depressor T is connected with the current transformer, and Industrial Frequency Transformer T is simultaneously connected with low-voltage distribution net side.
The Industrial Frequency Transformer T is connected with the current transformer, and Industrial Frequency Transformer T is simultaneously connected with low-voltage distribution net side, can be with
It is that the Industrial Frequency Transformer T secondary side is concatenated inductance L1It is in parallel with the rectification circuit input side afterwards, Industrial Frequency Transformer T primary sides
Side is in parallel with distribution network system side, the inverter circuit outlet side with by inductance L2With electric capacity C2The filter circuit connection of composition, should
The live wire of the zero line of filter circuit outlet side and low-voltage network connects, the live wire of filter circuit outlet side and low-voltage network
Zero line turns into the outlet side after low-voltage network voltage compensation.
The Industrial Frequency Transformer T is connected with the current transformer, and Industrial Frequency Transformer T is simultaneously connected with low-voltage distribution net side, also may be used
To be that the rectification circuit input side passes through series inductance L1It is in parallel with distribution network system side afterwards, the inverter circuit outlet side with
By inductance L2With electric capacity C2The filter circuit connection of composition, the filter circuit outlet side and the Industrial Frequency Transformer T primary sides side are simultaneously
The live wire of connection, the zero line of Industrial Frequency Transformer T secondary side and low-voltage network connects, the live wire of Industrial Frequency Transformer T secondary side with it is low
Being press-fitted the zero line of power network turns into the outlet side after low-voltage network voltage compensation.
Back-to-back converter described in the utility model can be equivalent to rectification circuit+inverter circuit.The utility model is actually
It is coupled in an Industrial Frequency Transformer and an AC-DC-AC current transformers, a small amount of element of addition is formed, and is matched somebody with somebody on this basis with low pressure
Network system connects, and has two kinds of connections, a kind of connection：Rectification circuit is isolated through Industrial Frequency Transformer with power distribution network, inverter circuit
Zero line is connected with the live wire of low-voltage network, and using the zero line of the live wire of inverter circuit and low-voltage network as low-voltage network
Output after voltage compensation.Another connection：Inverter circuit outlet side is directly articulated on power distribution network, and will through Industrial Frequency Transformer
Inverter circuit outlet side isolation and amplifier, the non-same polarity of Industrial Frequency Transformer connect the live wire of low-voltage network, its Same Name of Ends and low pressure
Live wire and zero line of the zero line of power distribution network respectively as outlet side.
Normal working voltage needed for being less than when low-voltage network single-phase load end (user terminal) voltage, passes through the utility model
One small voltage related to deviateing normal voltage value is provided, makes its output of being connected with power distribution network outlet side, to meet load side
Required normal working voltage.Compared to the method boosted in circuit series connection AC-AC or AC-DC-AC devices, the utility model
Belong to low-voltage, low power device, so as to save cost.Insulated gate bipolar transistor IGBT in the utility model, this
Body can be by controlling service time to provide reactive power.The quality of power supply of reactive-load compensation can be only provided compared to being used in traditional approach
Comprehensive treatment device, the utility model can not only provide reactive-load compensation but also can compensate the Voltage Drop value caused by line resistance
(active compensation).
Brief description of the drawings
Fig. 1 is the conventional Power Quality Comprehensive Treatment Device schematic diagram of tradition.
Fig. 2 is conspectus of the utility model Industrial Frequency Transformer in rectification side.
Fig. 3 is conspectus of the utility model Industrial Frequency Transformer in inverter side.
Fig. 4 A are to apply low-voltage network system side voltage and current waveform of the present utility model.
Fig. 4 B are to apply low-voltage network load side voltage and current waveform of the present utility model.
Fig. 5 is the main oscillogram that the utility model uses Industrial Frequency Transformer in rectification side topological structure.
Fig. 6 is the main oscillogram that the utility model uses Industrial Frequency Transformer in inverter side topological structure.
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
Fig. 2 is the conspectus for the low pressure trend series compensation device for using the first topological structure of the utility model, it is assumed that
System terminal voltage falls to 180V in text, load terminal voltage adjust to target be 220V, and set Industrial Frequency Transformer T no-load voltage ratios as 1:
1, each line current mark is as shown in Figure 2.Rectification circuit is through Industrial Frequency Transformer T series inductances L in back-to-back converter1And with
Network system side (main side) isolates, i.e. Industrial Frequency Transformer T secondary side is concatenated inductance L1Afterwards with the rectification circuit input side simultaneously
Connection, Industrial Frequency Transformer T primary sides side is in parallel with distribution network system side, while system side single-phase alternating current is rectified into directly by rectification circuit
Stream electricity, passes through electric capacity C1It is connected with DC wire with inverter circuit；The inverter circuit outlet side with by inductance L2With electric capacity C2Structure
Into filter circuit connection, the live wire of the zero line of the filter circuit outlet side and low-voltage network connects, filter circuit outlet side
Live wire and low-voltage network zero line turn into low-voltage network voltage compensation after outlet side.
There is following relation in Fig. 2：
From above-mentioned hypothesis and formula (1),
In formula, PLoadThe power consumed by load side, PSystemThe power provided by system side, PCompensationTo flow through compensation dress
The power put.
It is apparent from, PSystem=PLoad, Δ v=220V-180V=40V, so flowing through the power of low pressure trend series compensation device with bearing
Power ratio needed for lotus side is：
ρ=PCompensation/PLoad=Δ v/220=18.18% (3)
Flow through the power P of transformerT=180*I6, ignore line loss, then have PT=PCompensation=18.18%PLoad, that is, flow
The power for crossing transformer is only the 18.18% of whole power, and because it is Industrial Frequency Transformer, therefore holistic cost is relatively small.
Fig. 3 is using the conspectus of the low pressure trend series compensation device of second of topological structure of the utility model, is same as above,
It is assumed that system terminal voltage falls to 180V in text, load terminal voltage adjust to target be 220V, and set Industrial Frequency Transformer T changes
Than for 1:1, each line current mark is as shown in Figure 3.In back-to-back converter rectification circuit directly with low-voltage network system side
(main side) is connected, i.e., rectification circuit input side passes through series inductance L1It is in parallel with distribution network system side afterwards, while utilize rectified current
System side single-phase alternating current is rectified into direct current, such as 400VDC by road topological structure, and passes through electric capacity C1And DC link
It is connected with inverter circuit；Inverter circuit can be with the alternating current of normal use into power distribution network user side by 400V DC inverters；Institute
State inverter circuit outlet side and by inductance L2With electric capacity C2The filter circuit connection of composition, the filter circuit outlet side and the work
Frequency power transformer T primary sides side is in parallel, and the zero line of Industrial Frequency Transformer T secondary side and the live wire of low-voltage network connect, Industrial Frequency Transformer T
The live wire of secondary side and the zero line of low-voltage network turn into the outlet side after low-voltage network voltage compensation.
There is following relation in Fig. 3：
From above-mentioned hypothesis and formula (3),
In formula, PLoadThe power consumed by load side, PSystemThe power provided by system side, PCompensationTo flow through compensation dress
The power put.
It is apparent from, PSystem=PLoad, Δ v=220V-180V=40V, so flowing through the power of low pressure trend series compensation device with bearing
Power ratio needed for lotus side is：
ρ=PCompensation/PLoad=Δ v/220=40/220=18.18% (6)
Flow through the power P of transformerT=Δ v*I7, ignore line loss, then have PT=PCompensation=18.18%PLoad, that is, flow
The power for crossing transformer is only the 18.18% of whole power, and because it is Industrial Frequency Transformer, therefore holistic cost is relatively small.
Claims (3)
1. a kind of distribution network voltage based on low pressure trend string reinforcing method falls compensation circuit, including an Industrial Frequency Transformer and an AC-
DC-AC current transformers, it is characterized in that the AC-DC-AC current transformers be connected by AC-DC rectification circuits with DC-AC inverter circuits and
Into back-to-back converter；
The rectification circuit is the full-bridge rectification connected and composed by insulated gate bipolar transistor IGBT and anti-paralleled diode VD
Circuit, the inverter circuit are the full-bridge invertings connected and composed by insulated gate bipolar transistor IGBT and anti-paralleled diode VD
Circuit, the rectification circuit outlet side pass through electric capacity of voltage regulation C1It is connected with the inverter circuit input side, the Industrial Frequency Transformer T
It is connected with the current transformer, Industrial Frequency Transformer T is simultaneously connected with low-voltage distribution net side.
2. compensation circuit as claimed in claim 1, it is characterized in that the Industrial Frequency Transformer T is connected with the current transformer, power frequency
Transformer T is simultaneously connected with low-voltage distribution net side, refers to that the Industrial Frequency Transformer T secondary side is concatenated inductance L1Afterwards with the rectification
Circuit input side is in parallel, and Industrial Frequency Transformer T primary sides side is in parallel with distribution network system side, the inverter circuit outlet side and by inductance
L2With electric capacity C2The filter circuit connection of composition, the zero line of the filter circuit outlet side and the live wire of low-voltage network connect, filtering
The live wire of circuit output side and the zero line of low-voltage network turn into the outlet side after low-voltage network voltage compensation.
3. compensation circuit as claimed in claim 1, it is characterized in that the Industrial Frequency Transformer T is connected with the current transformer, power frequency
Transformer T is simultaneously connected with low-voltage distribution net side, refers to that the rectification circuit input side passes through series inductance L1Afterwards with power distribution network system
Side of uniting is in parallel, the inverter circuit outlet side with by inductance L2With electric capacity C2The filter circuit connection of composition, filter circuit output
Side is in parallel with the Industrial Frequency Transformer T primary sides side, and the zero line of Industrial Frequency Transformer T secondary side and the live wire of low-voltage network connect,
The live wire of Industrial Frequency Transformer T secondary side and the zero line of low-voltage network turn into the outlet side after low-voltage network voltage compensation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721007547.XU CN207200283U (en) | 2017-08-11 | 2017-08-11 | A kind of distribution network voltage based on low pressure trend string reinforcing method falls compensation circuit |
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|---|---|---|---|
| CN201721007547.XU CN207200283U (en) | 2017-08-11 | 2017-08-11 | A kind of distribution network voltage based on low pressure trend string reinforcing method falls compensation circuit |
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| CN207200283U true CN207200283U (en) | 2018-04-06 |
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| CN201721007547.XU Expired - Fee Related CN207200283U (en) | 2017-08-11 | 2017-08-11 | A kind of distribution network voltage based on low pressure trend string reinforcing method falls compensation circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394787A (en) * | 2017-08-11 | 2017-11-24 | 浙江大学 | A kind of distribution network voltage based on low pressure trend string reinforcing method falls compensation circuit |
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2017
- 2017-08-11 CN CN201721007547.XU patent/CN207200283U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394787A (en) * | 2017-08-11 | 2017-11-24 | 浙江大学 | A kind of distribution network voltage based on low pressure trend string reinforcing method falls compensation circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180406 Termination date: 20190811 |
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| CF01 | Termination of patent right due to non-payment of annual fee |