CN109755934A - A kind of bipolarity DC power supply apparatus applied to direct-flow distribution system - Google Patents
A kind of bipolarity DC power supply apparatus applied to direct-flow distribution system Download PDFInfo
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- CN109755934A CN109755934A CN201711059569.5A CN201711059569A CN109755934A CN 109755934 A CN109755934 A CN 109755934A CN 201711059569 A CN201711059569 A CN 201711059569A CN 109755934 A CN109755934 A CN 109755934A
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Abstract
A kind of bipolarity DC power supply apparatus applied to direct-flow distribution system of the present invention, when the power of bipolarity DC bus is in a basic balance, the bipolarity DC bus power that transformation of electrical energy unit can use 20% ~ 30% power meets the needs of electrical appliance total power, and transformation of electrical energy unit needs distribution and power characteristic with electrical appliance on bipolarity bus etc. to be intimately associated in design in bipolarity DC power supply apparatus.Bipolarity DC power supply apparatus internal control system carries out fft analysis according to the current signal that CS1, CS2, CS3 current sensor sample; and the judgement such as overcurrent and electric arc is carried out according to concrete outcome; and control switch K1, K2, K3 are moved at the same time, and realize control protection and arc protection etc..
Description
Technical field
The invention patent relates to DC distribution fields, more particularly to using the field of power distribution of bipolarity direct current supply.
Background technique
Compared to current AC distribution field, DC distribution is not due to having the challenges such as frequency, phase, in the reliable of distribution
Property and stability in terms of have greater advantages, in addition gradualling mature and applying with systems such as new energy and energy storage, these hair
Electricity and charge storage unit itself are also DC form, and in addition current power load is greatly whole by exchanging inside load
It flows to direct current to be gone again to load power supply, such direct-flow distribution system that is directly accessed can be realized more using the method for DC distribution
Low energy consumption and higher benefit, therefore DC distribution certainly will be a kind of development trend of the following power supply.Using the straight of low-voltage
Stream is limited with electrical transmission radius of electricity supply, is had using the compatibility of the current DC electric apparatus of the DC distribution of high voltage and is asked greatly again very much
Topic, therefore the following DC distribution certainly will be a kind of in such a way that high voltage direct current is with electrical transmission and the power supply of low-voltage direct distribution, need
The power supply unit for wanting a high pressure and low pressure to convert.Current ask can solve using the high-low pressure conversion power supply device of total power
Topic, but initial outlay and loss are very big, will be greatly reduced using the advantage of DC distribution, how to use a kind of power supply unit
Realize the conversion of high-low pressure, and the initial outlay with very little and very high Energy Efficiency Ratio are must to consider that is solved asks first
Topic.Low-voltage direct distribution directly docks electrical appliance simultaneously, and perfect DC measurement, direct current protecting etc. must be complete in this section
At this is also a kind of this background that the bipolarity DC power supply apparatus applied to direct-flow distribution system proposes.
Summary of the invention
In order to solve the problems, such as direct-flow distribution system mesohigh direct current transmission and low-voltage DC supply, consider initial outlay and
Efficiency etc. is improved, in combination with the safety etc. of low-voltage DC supply, the present invention provides one kind to be applied to direct-flow distribution system
Bipolarity DC power supply apparatus.Using a kind of bipolarity DC power supply apparatus connection high voltage transmission monopole type DC bus and
Low voltage power supply bipolarity DC bus, and the functions such as integrated DC measurement, direct current protecting.It is electric in bipolarity DC power supply apparatus
Energy converter unit maintains the stabilization of bipolarity supplying DC bus using the class three-level topology structure of two half-bridge modules compositions,
It can reduce the power grade of transformation of electrical energy unit by the electrical appliance that rational design is distributed in bipolarity DC bus, utilize
The transformation of electrical energy unit of Partial Power meets the needs of bipolarity DC bus bearing power.
Technical solution
A kind of bipolarity DC power supply apparatus applied to direct-flow distribution system of the present invention is suitable for straight using unipolar high voltage
Stream bus is carried out remote electric energy transmission and is carried out the DC distribution of local electric power supply using bipolarity low-voltage direct-current bus
System, as shown in Figure 1.Direct-flow distribution system carries out electric energy with 750V unipolarity DC bus and transmits at a distance, while high-power
Load can be directly connected on 750V transmission bus.Unipolarity 750V DC bus is turned by bipolarity DC power supply apparatus
Being changed to ± 375V bipolarity DC bus is the power supply such as DC electric apparatus in local zone.Each region uses a bipolarity direct current
Power supply unit generation ± 375V bipolarity DC bus is local load power supply.
It is straight in small area that a kind of bipolarity DC power supply apparatus applied to direct-flow distribution system of the present invention, which is a kind of,
The device that galvanic electricity device is powered, join domain outside 750V DC bus, internal generation ± 375V bipolarity DC bus are
Local load power supply.As shown in Fig. 2, the terminal as one's respective area power supply, bipolarity DC power supply apparatus is internally integrated electric energy change
It changes, electrical energy measurement, control the units such as protection, electric arc detection of electrical leakage and monitoring display.
A kind of bipolarity DC power supply apparatus applied to direct-flow distribution system of the present invention, transformation of electrical energy unit use two
The class three-level topology structure of half-bridge module composition, as shown in Figure 3.Electricity can be reduced using class three-level topology DC/DC structure
Feel volume, reduce current ripples, realizes the pressure stabilizing and equilibrium to positive and negative busbar voltage using class three-level topology DC/DC converter
Control.Class three-level topology DC/DC converter only undertakes Down Highway difference power on bipolarity DC bus, by suitably setting
Meter bipolarity DC bus electrical appliance can greatly reduce transformation of electrical energy cell power grade, improve system effectiveness.
A kind of bipolarity DC power supply apparatus applied to direct-flow distribution system of present method invention increases in double-polarity control side
Making alive and current detecting unit, while active switch is configured, meet the functions such as transformation of electrical energy, electrical energy measurement, arc protection
It is required that.
Beneficial effect
It is straight that a kind of bipolarity DC power supply apparatus applied to direct-flow distribution system is satisfied with the following direct-flow distribution system high voltage
Flow long distance transmission, the demand of low-voltage direct-current short distance distribution；
A kind of bipolarity DC power supply apparatus applied to direct-flow distribution system uses three level of class of two half-bridge modules composition
Topological structure realization high-low voltage is directly converted and power transmission, and different from traditional total power converter, this one kind is applied to
The bipolarity DC power supply apparatus of direct-flow distribution system is only carrying out power between bipolarity DC bus opposed polarity bus
Difference interaction, not carry out total power transformation, cooperation external dc electrical appliance distribution can greatly reduce system at the beginning of
Begin investment and energy consumption；Again, a kind of this bipolarity DC power supply apparatus applied to direct-flow distribution system is as in local zone
The critical point of DC distribution is also equipped with electrical energy measurement especially direct-current arc and detects in addition to having voltage conversion and power transmission
With protection etc. functions, improve the safety of direct current supply.
Detailed description of the invention
Fig. 1 is direct-flow distribution system figure.
Fig. 2 is bipolarity DC power supply apparatus schematic diagram.
Fig. 3 is bipolarity power supply unit internal structure.
In Fig. 1
750V is long range direct current transmission voltage class；
+ 375V is local zone low voltage dipole DC bus positive bus-bar；
0V is zero bus of local zone low voltage dipole DC bus；
- 375V is local zone low voltage dipole DC bus negative busbar；
In Fig. 2
750V is long range direct current transmission voltage class；
+ 375V is local zone low voltage dipole DC bus positive bus-bar；
0V is zero bus of local zone low voltage dipole DC bus；
- 375V is local zone low voltage dipole DC bus negative busbar；
In Fig. 3
750V is long range direct current transmission voltage class；
+ 375V is local zone low voltage dipole DC bus positive bus-bar；
0V is zero bus of local zone low voltage dipole DC bus；
- 375V is local zone low voltage dipole DC bus negative busbar；
T1, T2, T3, T4 are bipolarity power supply unit transformation of electrical energy unit switch device；
C1, C2 are bipolarity power supply unit transformation of electrical energy unit double-polarity control lateral capacitance；
TS1, TS2 are bipolarity power supply unit transformation of electrical energy unit double-polarity control side voltage sensor；
CS1, CS2, CS3 are bipolarity power supply unit transformation of electrical energy unit double-polarity control side current sensor；
K1, K2, K3 are bipolarity power supply unit transformation of electrical energy unit double-polarity control side switch；
V1 is bipolarity power supply unit transformation of electrical energy unit double-polarity control side positive pole line voltage；
V2 is bipolarity power supply unit transformation of electrical energy unit double-polarity control side negative busbar voltage；
I1 is bipolarity power supply unit transformation of electrical energy unit double-polarity control side positive pole line current；
I2 is bipolarity power supply unit transformation of electrical energy unit double-polarity control side negative busbar electric current；
I0 is zero bus current of bipolarity power supply unit transformation of electrical energy unit double-polarity control side；
IL is bipolarity power supply unit transformation of electrical energy unit inductive current.
Specific embodiment
As shown in Figure 1, bipolarity DC power supply apparatus is suitable for being passed at a distance using unipolar high voltage (750V)
Direct-flow distribution system defeated, that local zone power supply is carried out using bipolarity low-voltage (± 375V), as unipolar high voltage and
The conversion equipment of bipolarity low-voltage, while as bipolarity DC power supply apparatus in region, high-tension high-power DC electric apparatus
Can connect between+375V bus and -375V bus, conventional DC electric appliance can connect in+375V bus and 0V bus with
And between 0V bus and -375V bus.
As shown in Fig. 2, device of the bipolarity DC power supply apparatus as bipolarity direct current supply in region, in addition to high pressure to
Low pressure, unipolarity are to except bipolarity transformation of electrical energy, being also integrated with electrical energy measurement, control protection, electric arc detection of electrical leakage and monitoring
The functions such as display.
As shown in figure 3, mainly including transformation of electrical energy main circuit, sampling sensing in bipolarity DC power supply apparatus internal structure
Device and switch, control system etc..Wherein transformation of electrical energy main circuit is topological using the three level DC/DC of class of two half-bridge modules composition
Structure, bipolarity DC power supply apparatus outlet side increase positive polarity voltage sensor TS1 and reverse voltage sensor TS2,
Positive bus-bar, zero bus and negative busbar increase current sensor CS1, CS2, CS3 and active protective switch K1, K2, K3.
Bipolarity DC power supply apparatus transformation of electrical energy main circuit part, setting bipolar voltage deviation are VH, control system
Three level of class is controlled according to bipolar voltage the value V1 and V2 that voltage sensor TS1 and reverse voltage sensor TS2 are detected
DC/DC work.When detecting V1 > V2 and V1-V2 >=VH, switching element T 1, T3 are led in 3 main circuit of control system control figure
Logical, T2, T4 shutdown, input 750V voltage are charged by T1, T3 and inductance L to capacitor C2, so that voltage V2 is increased, while capacitor
C1 is by T1, T3 and inductance L self-discharge, so that voltage V1 is reduced, when detecting V1-V2 < VH, control system control T2,
T3 conducting, T1, T4 shutdown, inductive current pass through T1, T2 afterflow, capacitor C1 and capacitor C2 without charge circuit, as bipolarity is straight
The difference of electrical appliance power changes on stream bus；When detecting V2 > V1 and V2-V1 >=VH, control system control figure
Switching element T 2, T4 conducting, T1, T3 shutdown, input 750V voltage are filled by T2, T4 and inductance L to capacitor C1 in 3 main circuits
Electricity, so that voltage V1 is increased, while capacitor C2 is by T2, T4 and inductance L self-discharge, so that voltage V2 is reduced, when detecting
When V2-V1 < VH, control system controls T2, T3 conducting, T1, T4 shutdown, and inductive current passes through T3, T2 afterflow, capacitor C1 and electricity
Hold C2 without charge circuit, as the difference of electrical appliance power on bipolarity DC bus changes.Transformation of electrical energy unit fortune
Row is divided into three operating conditions: 1., V1 > V2 and when V1-V2 >=VH, T1, T3 conducting, T2, T4 shutdown；2., V2 > V1 and V2-V1 >=
When VH, T2, T4 conducting, T1, T3 shutdown；3., | V1-V2 | when < VH, T2, T3 conducting, T1, T4 shutdown.
Zero bus current I0=I1-I2 of bipolarity DC bus in Fig. 3 passes through direct current between reasonable layout bipolarity bus
Device power can make I0 ≈ 0, and it is about 0 that bipolarity DC power supply apparatus transformation of electrical energy unit, which flows through power, therefore by reasonable
Design is distributed in the DC electric apparatus between bipolarity bus, and the transformation of electrical energy unit that can use 20% ~ 30% power meets in region
The full power of direct current electrical appliance.
Bipolarity DC power supply apparatus control system is carried out according to the current signal that CS1, CS2, CS3 current sensor sample
Fft analysis, and the judgement such as overcurrent and electric arc is carried out according to concrete outcome, and control switch K1, K2, K3 are moved at the same time, and realize control
System protection and arc protection etc..
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (7)
1. a kind of bipolarity DC power supply apparatus applied to direct-flow distribution system, it is characterised in that: be suitable for using unipolarity
High voltage meets long distance powedr transmission radius requirement, using the direct-flow distribution system of bipolarity low-voltage compatible direct current electrical appliance,
The terminal DC power supply apparatus of conversion equipment and small area as unipolar high voltage and bipolarity low-voltage.
2. bipolarity DC power supply apparatus according to claim 1, it is characterised in that: bipolarity DC power supply apparatus is not only
Be one realization voltage transformation power cell or an integrated transformation of electrical energy, control protection, electric arc current leakage detection protection and
The direct current terminal power supply unit that monitoring display is integrated.
3. bipolarity DC power supply apparatus according to claim 2, it is characterised in that: electric in bipolarity DC power supply apparatus
Energy converter unit needs distribution and power characteristic with electrical appliance on bipolarity bus etc. to be intimately associated in design, does as far as possible
To the power-balance of bipolarity DC bus, transformation of electrical energy unit can use the bipolarity DC bus function of 20% ~ 30% power
Rate meets the needs of electrical appliance total power.
4. bipolarity DC power supply apparatus according to claim 3, it is characterised in that: electric in bipolarity DC power supply apparatus
Can converter unit use two half-bridge modules composition class three-level topology structure, the positive bus-bar of bipolarity direct current supply bus and
Negative busbar is directly connected to unipolar high voltage bus positive and negative terminal, controls bipolarity DC bus by class three-level topology structure DC/DC
Zero curve, power density is high, controls simple and reliable, the direct current supply use in suitable region.
5. bipolarity DC power supply apparatus according to claim 4, it is characterised in that: electric in bipolarity DC power supply apparatus
Can converter unit operation is divided into three operating conditions: 1., V1 > V2 and when V1-V2 >=VH, T1, T3 conducting, T2, T4 shutdown；2., V2 >
V1 and when V2-V1 >=VH, T2, T4 conducting, T1, T3 shutdown；3., | V1-V2 | when < VH, T2, T3 conducting, T1, T4 shutdown.
6. bipolarity DC power supply apparatus according to claim 5, it is characterised in that: electric in bipolarity DC power supply apparatus
When energy converter unit detects V1 > V2 and V1-V2 >=VH, switching element T 1, T3 conducting in 3 main circuit of control system control figure,
T2, T4 shutdown, input 750V voltage is charged by T1, T3 and inductance L to capacitor C2, so that voltage V2 is increased, while capacitor C1
By T1, T3 and inductance L self-discharge, so that voltage V1 is reduced, when detecting V1-V2 < VH, control system controls T2, T3
Conducting, T1, T4 shutdown, inductive current pass through T2, T3 afterflow, capacitor C1 and capacitor C2 without charge circuit, with bipolarity direct current
The difference of electrical appliance power changes on bus；When detecting V2 > V1 and V2-V1 >=VH, control system control figure 3
Switching element T 2, T4 conducting in main circuit, T1, T3 shutdown, input 750V voltage are charged by T2, T4 and inductance L to capacitor C1,
So that voltage V1 is increased, while capacitor C2 is by T2, T4 and inductance L self-discharge, so that voltage V2 is reduced, when detecting V2-
When V1 < VH, control system controls T2, T3 conducting, T1, T4 shutdown, and inductive current passes through T3, T2 afterflow, capacitor C1 and capacitor C2
Without charge circuit, as the difference of electrical appliance power on bipolarity DC bus changes.
7. bipolarity DC power supply apparatus according to claim 2, it is characterised in that: inside bipolarity DC power supply apparatus
Control system carries out fft analysis according to the current signal that CS1, CS2, CS3 current sensor sample, and is carried out according to concrete outcome
The judgement such as overcurrent and electric arc, and control switch K1, K2, K3 are moved at the same time, and realize control protection and arc protection etc..
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711059569.5A CN109755934A (en) | 2017-11-01 | 2017-11-01 | A kind of bipolarity DC power supply apparatus applied to direct-flow distribution system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711059569.5A CN109755934A (en) | 2017-11-01 | 2017-11-01 | A kind of bipolarity DC power supply apparatus applied to direct-flow distribution system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110167233A (en) * | 2019-06-10 | 2019-08-23 | 马化盛 | A kind of direct current supply distribution structure |
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| US20100008105A1 (en) * | 2008-07-09 | 2010-01-14 | Sma Solar Technology Ag | Dc/dc converter |
| CN104218805A (en) * | 2014-07-25 | 2014-12-17 | 国家电网公司 | Unipolar-bipolar convertible direct-current converter |
| CH708498A2 (en) * | 2013-08-28 | 2015-03-13 | ETH Zürich | Apparatus and method for galvanic isolation and voltage balancing in a bi-directional DC-DC converter with high-frequency AC-AC transformer. |
| US20170117817A1 (en) * | 2015-10-22 | 2017-04-27 | Qatar Foundation For Education, Science And Community Development | Method of converting high voltage ac lines into bipolar high voltage dc systems |
| CN106786694A (en) * | 2016-12-21 | 2017-05-31 | 太原理工大学 | A kind of bipolarity direct-current grid mixed energy storage system control method for coordinating |
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2017
- 2017-11-01 CN CN201711059569.5A patent/CN109755934A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100008105A1 (en) * | 2008-07-09 | 2010-01-14 | Sma Solar Technology Ag | Dc/dc converter |
| CH708498A2 (en) * | 2013-08-28 | 2015-03-13 | ETH Zürich | Apparatus and method for galvanic isolation and voltage balancing in a bi-directional DC-DC converter with high-frequency AC-AC transformer. |
| CN104218805A (en) * | 2014-07-25 | 2014-12-17 | 国家电网公司 | Unipolar-bipolar convertible direct-current converter |
| US20170117817A1 (en) * | 2015-10-22 | 2017-04-27 | Qatar Foundation For Education, Science And Community Development | Method of converting high voltage ac lines into bipolar high voltage dc systems |
| CN106786694A (en) * | 2016-12-21 | 2017-05-31 | 太原理工大学 | A kind of bipolarity direct-current grid mixed energy storage system control method for coordinating |
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|---|---|---|---|---|
| CN110167233A (en) * | 2019-06-10 | 2019-08-23 | 马化盛 | A kind of direct current supply distribution structure |
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Application publication date: 20190514 |