CN205791545U - A kind of distribution system active capacity balancer - Google Patents
A kind of distribution system active capacity balancer Download PDFInfo
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- CN205791545U CN205791545U CN201620435272.9U CN201620435272U CN205791545U CN 205791545 U CN205791545 U CN 205791545U CN 201620435272 U CN201620435272 U CN 201620435272U CN 205791545 U CN205791545 U CN 205791545U
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- reversible transducer
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- distribution 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
A kind of distribution system active capacity balancer, a kind of distribution system active capacity balancer, device includes: the first reversible transducer, the dc bus in attachment means and one of them distribution transformer；Second reversible transducer, connects dc bus and another distribution transformer；Voltage sampling unit；First current sampling unit, connects with one end being connected with distribution transformer of the first reversible transducer；Second current sampling unit, connects with one end being connected with distribution transformer of the second reversible transducer；First controller, connects voltage sampling unit, the first current sampling unit and the first reversible transducer respectively, for driving the first reversible transducer work；Second controller, connects the second current sampling unit and the second reversible transducer respectively, for driving the second reversible transducer work.This utility model can realize localized power distribution capacity enlargement and local reactive-load compensation, it is not necessary to strengthens circuit distribution capacity.
Description
Technical field
This utility model relates to power domain, particularly relates to a kind of distribution system active capacity balancer.
Background technology
Along with expanding economy and the raising of living standards of the people, power consumption increases sharply, former power distribution network of building
Equipment and wire all do not match that with power consumption, many local overload operations, not only affect power supply safety,
Also greatly increases the loss of distribution system.In power supply-distribution system, inductive load increases sharply simultaneously, numerous
Distribution transformer and motor are in the non-economy running status of underload rate, cause the idle merit of power supply-distribution system
The wilderness demand of rate, as supplemented not in time, will cause supply voltage Quality Down, and system loss increases, both
Electric energy to be wasted, will affect the utilization rate of power supplying and distributing equipment again, even cause the accident.
The technical measures solving problem above at present are more new line and equipment, increase and circuit in modernization system
Capacity and the capacity of distribution transformer, simultaneously add prosthetics electric capacity at supplier of electricity and electricity consumption side, reduce line
Path loss consumes, and improves economic row and safety that system is run.It is big to there is technological transformation difficulty in these remodeling methods,
Cost is high, and capacity configuration is dumb, and the problem such as follow-up dilatation is difficult.Especially for localized power distribution capacity
In the case of deficiency, the difficulty of its transformation strengthens especially.
Utility model content
The technical problems to be solved in the utility model is, for the drawbacks described above of prior art, it is provided that a kind of
Distribution system active capacity balancer.
This utility model solves its technical problem and be the technical scheme is that a kind of distribution system of structure is active
Capacity equilibrium device, described distribution system includes at least one grid branch being connected with high voltage bus, each
Being provided with a distribution transformer in grid branch, the input of distribution transformer is connected with high voltage bus and defeated
Going out end to be connected with load, described device is connected between the outfan of two distribution transformers, described device bag
Include:
First reversible transducer, the dc bus in attachment means and one of them distribution transformer, for steady
Determine the voltage of dc bus and corresponding distribution transformer is carried out reactive-load compensation；
Second reversible transducer, connects described dc bus and another distribution transformer, is used for controlling to gain merit
The size and Orientation of electric current and corresponding distribution transformer is carried out reactive-load compensation；
Voltage sampling unit, the voltage of described dc bus of sampling；
First current sampling unit, connects with one end being connected with distribution transformer of the first reversible transducer,
Sample the output electric current of the first reversible transducer；
Second current sampling unit, connects with one end being connected with distribution transformer of the second reversible transducer,
Sample the output electric current of the second reversible transducer；
First controller, connects voltage sampling unit, the first current sampling unit and the first two-way change respectively
Parallel operation, becomes for voltage based on dc bus, the output electric current of the first reversible transducer, corresponding distribution
The reactive power of the load that depressor is carried drives the first reversible transducer work；
Second controller, connects the second current sampling unit and the second reversible transducer respectively, for based on
The active power of load that two distribution transformers are carried, the output electric current of the second reversible transducer, corresponding
The reactive power of the load that distribution transformer is carried drives the second reversible transducer work.
In distribution system active capacity balancer described in the utility model, described first reversible transducer
All include with the second reversible transducer: N number of brachium pontis, N number of first electric capacity, N number of first inductance, N number of second
Inductance, N number of reactance, two bus capacitors, wherein N is the integer of 1-3；Each brachium pontis include brachium pontis,
Lower brachium pontis, the first diode and the second diode, upper brachium pontis and lower brachium pontis all include: the power of two concatenations
Switching device and inverse parallel fly-wheel diode on each device for power switching；
Two bus capacitors are serially connected between positive direct-current bus and negative dc bus, the connection of two bus capacitors
Node is as the midpoint of dc bus；The end that controls of all of device for power switching is controlled with corresponding first respectively
Device processed/second controller connects, the connection node and the one or two of two device for power switching of each upper brachium pontis
The negative pole of pole pipe connects, two device for power switching of each lower brachium pontis connect node and the second diode
Positive pole connects, and the positive pole of the first diode and the negative pole of the second diode are connected to the midpoint of dc bus；N
First end of individual first electric capacity is connected to the midpoint of dc bus, the second end of N number of first electric capacity respectively with
First end of N number of first inductance and the first end of N number of second inductance connect, the second of N number of first inductance
End is respectively connecting at the upper brachium pontis of N number of brachium pontis and the connection node of lower brachium pontis, the second of N number of second inductance
End point is connected with the outfan of distribution transformer by N number of reactance.
In distribution system active capacity balancer described in the utility model, described device for power switching is
Audion.
In distribution system active capacity balancer described in the utility model, described first controller and
Two controllers are PI controller.
In distribution system active capacity balancer described in the utility model, described first reversible transducer
And/or second reversible transducer connected with corresponding distribution transformer by an isolating transformer.
Implement distribution system active capacity balancer of the present utility model, have the advantages that this reality
Can apply between two distribution transformers with novel device, it is achieved localized power distribution capacity enlargement and this locality
Reactive-load compensation, and without strengthening the distribution capacity of corresponding transformator and circuit, low cost, capacity configuration is flexible.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the mounting structure schematic diagram of this utility model distribution system active capacity balancer；
Fig. 2 is the structured flowchart of this utility model distribution system active capacity balancer；
Fig. 3 is the circuit theory diagrams of two reversible transducers in Fig. 2；
Fig. 4 is the illustraton of model of the first controller in Fig. 2；
Fig. 5 is the illustraton of model of the second controller in Fig. 2.
Detailed description of the invention
In order to technical characteristic of the present utility model, purpose and effect are more clearly understood from, now compare attached
Figure describes detailed description of the invention of the present utility model in detail.
With reference to Fig. 1, it it is the mounting structure schematic diagram of this utility model distribution system active capacity balancer.
The distribution system that device of the present utility model is applied includes: high voltage bus is connected with high voltage bus
At least one grid branch, as being diagrammatically only by out three grid branch in figure, each grid branch is provided with
One distribution transformer, as shown in T1, T2, T3 in figure, T1, T2, T3 be generally a solitary building or
Distribution transformer in the Relatively centralized regions such as one industrial park.Distribution transformer T1, T2, T3's is defeated
Enter end to be connected with high voltage bus and outfan is connected with load Load1, Load2, Load3, distribution transformer
The voltage of high voltage bus is carried out blood pressure lowering by T1, T2, T3 respectively, supply the load Load1 of respective rear end, Load2,
Load3.Active capacity balancer of the present utility model is connected between the outfan of two distribution transformers,
As in figure, APCS i.e. represents active capacity balancer of the present utility model, A, B represent distribution transformer respectively
The outfan of device T1, T2.
APCS can be arranged as required between two grid branch realize localized power distribution capacity enlargement,
Such as, if the active power of Load1 is more than the meritorious capacity P0 of distribution transformer, and Load2's has
Merit power less than the meritorious capacity P0 of distribution transformer, then can consider the distribution in the two grid branch
An APCS is increased to realize localized power distribution capacity enlargement and local reactive-load compensation problem between transformator.
Concrete, with reference to Fig. 2, described device includes:
First reversible transducer, the dc bus in attachment means and one of them distribution transformer, for steady
Determine the voltage of dc bus and corresponding distribution transformer is carried out reactive-load compensation；
Second reversible transducer, connects described dc bus and another distribution transformer, is used for controlling to gain merit
The size and Orientation of electric current and corresponding distribution transformer is carried out reactive-load compensation；
Voltage sampling unit, the voltage of described dc bus of sampling；
First current sampling unit, connects with one end being connected with distribution transformer of the first reversible transducer,
Sample the output electric current of the first reversible transducer；
Second current sampling unit, connects with one end being connected with distribution transformer of the second reversible transducer,
Sample the output electric current of the second reversible transducer；
First controller, connects voltage sampling unit, the first current sampling unit and the first two-way change respectively
Parallel operation, becomes for voltage based on dc bus, the output electric current of the first reversible transducer, corresponding distribution
The reactive power of the load that depressor is carried drives the first reversible transducer work；
Second controller, connects the second current sampling unit and the second reversible transducer respectively, for based on
The active power of load that two distribution transformers are carried, the output electric current of the second reversible transducer, corresponding
The reactive power of the load that distribution transformer is carried drives the second reversible transducer work.
Wherein, the first controller and second controller can use PI controller.
Preferably, described first reversible transducer and/or the second reversible transducer are by an isolating transformer
Connect with corresponding distribution transformer.
With continued reference in Fig. 1, it is assumed that the amount of capacity of distribution transformer T1, T2, T3 is P0/Q0/S0,
The power of each distribution transformer T1, T2, T3 backend load is respectively P1/Q1/S1, P2/Q2/S2, P3/Q3/S3,
P0-P3 represents meritorious capacity, and Q0-Q3 represents that reactive capability, S0-S3 represent apparent capacity.Above APCS
The power flow through is Δ P/QA/QB。
Without installing APCS additional, the maximum system capacity that the most each power supply unit can bear is transformation
Device capacity, i.e. S1≤S0, S2≤S0, S3≤S0.If a certain load increases and exceeds distribution transformer in system
The meritorious capacity of device, it is assumed that P1 ＞ P0, P2 ＜ P0, P3≤P0, then active power is flowed to A by B by APCS,
Its size is Δ P (it is reference direction that power is flowed to A by B), and therefore obtain at Load1 and Load2 is
System capacity is respectively P1=P0+ Δ P, P2=P0-Δ P.In like manner, if P1 is ＜ P0, P2 ＞ P0, P3≤P0,
Then active power is flowed to B by A by APCS.
If it addition, there is bigger reactive load at T1 and T2, then APCS sends idle Q at A portA,
B port sends idle QB, and then compensate the reactive load that distribution transformer goes out, i.e. Q0=Q1-Q at T1A,
Q0=Q2-Q at T2B；The capacity of APCS device is only dependent upon Δ P, QA, QBSize, the least
Capacity in transformator.
With reference to Fig. 3, the first reversible transducer, the second reversible transducer all with representation shown in 100 in figure,
It all includes: N number of brachium pontis, N number of first electric capacity C1, N number of first inductance L1, N number of second inductance L2,
N number of reactance Z1, two bus capacitor C0, wherein N is the integer of 1-3, and in the present embodiment, N is 3.
Each brachium pontis includes brachium pontis, lower brachium pontis, the first diode D1 and the second diode D2, upper brachium pontis
All include with lower brachium pontis: the device for power switching of two concatenations and inverse parallel are on each device for power switching
Fly-wheel diode.Device for power switching can be the audion of the NPN type selected in audion, such as figure,
The emitter stage of the positive pole connecting triode of fly-wheel diode, the current collection of the negative pole connecting triode of fly-wheel diode
Pole.
Two bus capacitor C0 are serially connected between positive direct-current bus and negative dc bus, two bus capacitor C0
Connect node as the midpoint of dc bus, as shown in N in figure；The control of all of device for power switching
End connects with the first corresponding controller/second controller respectively, two power switch devices of each upper brachium pontis
The negative pole connecting node and the first diode D1 of part connects, two device for power switching of each lower brachium pontis
The positive pole connection connecting node and the second diode D2, the positive pole of the first diode D1 and the second diode
The negative pole of D2 is connected to the midpoint of dc bus；It is female that first end of N number of first electric capacity C1 is connected to direct current
The midpoint of line, second end of N number of first electric capacity C1 respectively with the first end and the N of N number of first inductance L1
First end of individual second inductance L2 connects, and second end of N number of first inductance L1 is respectively connecting to N number of brachium pontis
Upper brachium pontis and lower brachium pontis connection node at, second end of N number of second inductance L2 divides by N number of reactance
Z1 is connected with the outfan of distribution transformer.
Understand according to above-mentioned, if the active power of Load1 is more than P0, and Load2 less than P0, then
Active power is flowed to A by B by APCS, particularly as follows: the second reversible transducer is by the grid branch of T2 place
Part alternating current be converted to unidirectional current and be stored in dc bus, then the first reversible transducer is again by direct current
DC inverter in bus is that alternating current exports T1 place grid branch.
It should be explicitly made clear at this point, although be a specific embodiment as a example by the reversible transducer of three-phase above,
Actually reversible transducer can be three-phase, it is also possible to be single-phase, can be three-level converter, also
Can be two level converters, the physical switch of changer be any power conversion device, two two-way changings
Device can be independent converter module, it is also possible to be integrated in circuitry together.It addition, in scheme
Control strategy, either use digital control, or use analog circuit control, be this utility model
Deformation, all within protection domain of the present utility model.
Mentioned above, the first reversible transducer is used for the voltage of stable DC bus and becomes corresponding distribution
Depressor carries out reactive-load compensation, and the second reversible transducer is for controlling the size and Orientation of watt current and to phase
The distribution transformer answered carries out reactive-load compensation.It practice, the control of the equalizing sections for meritorious capacity, also
Can exchange the function of two changers, the i.e. first reversible transducer is for controlling size and the side of watt current
To, the second reversible transducer is for the voltage of stable DC bus.Below with the first reversible transducer for steady
Determine the voltage of dc bus, the second reversible transducer as a example by controlling the size and Orientation of watt current, say
The structure of its two corresponding controllers bright and operation principle.
With reference to Fig. 4, described first controller includes:
Voltage control loop, for the dc bus according to given busbar voltage reference value Ubus and sampling
Voltage Ubus_Fb is calculated reference value Id_ref of watt current；
First coordinate converter, for will the output electric current Iabc_Fb of the first reversible transducer of sampling through three
After two phase inversion, then obtained d shaft current i by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
Current regulator, for reference value Id_ref according to watt current, the reference value of reactive current
Iq_ref, d shaft current idWith q shaft current iqIt is calculated d axle, q axle, the output order of 0 axle；
Second coordinate converter, for obtaining d axle, q axle, the output order of 0 axle after Coordinate Conversion
SPWM control instruction uact；
SPWM driver, obtains driving for carrying out space vector modulation according to SPWM control instruction uact
The PWM drive signal of the first reversible transducer；
Wherein, reference value Iq_ref of reactive current is carried according to the corresponding distribution transformer detected
The reactive power Q 1 of load and the grid branch voltage V1 at place are calculated, Iq_ref=Q1/V1.
With reference to Fig. 5, described second controller includes:
First coordinate converter, for will the output electric current Iabc_Fb of the second reversible transducer of sampling through three
After two phase inversion, then obtained d shaft current i by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
Current regulator, for reference value Id_ref according to watt current, the reference value of reactive current
Iq_ref, d shaft current idWith q shaft current iqIt is calculated d axle, q axle, the output order of 0 axle；
Second coordinate converter, for obtaining d axle, q axle, the output order of 0 axle after Coordinate Conversion
SPWM control instruction uact；
SPWM driver, obtains driving for carrying out space vector modulation according to SPWM control instruction uact
The PWM drive signal of the first reversible transducer；
Wherein, reference value Id_ref of watt current is the meritorious capacity P0 and two according to distribution transformer
Individual load active power P1, P2 calculated Δ P and grid branch voltage V1 is calculated:
The load that reference value Iq_ref of reactive current is carried according to the corresponding distribution transformer detected
The grid branch voltage V2 at reactive power Q 2 and place is calculated, Iq_ref=Q2/V2.
In sum, implement distribution system active capacity balancer of the present utility model, have following useful
Effect: device of the present utility model can apply between two distribution transformers, it is achieved localized power distribution capacity
Dilatation and local reactive-load compensation, and without strengthening the distribution capacity of corresponding transformator and circuit, low cost, hold
Amount flexible configuration.
Above in conjunction with accompanying drawing, embodiment of the present utility model is described, but this utility model not office
Being limited to above-mentioned detailed description of the invention, above-mentioned detailed description of the invention is only schematically rather than to limit
Property, those of ordinary skill in the art is under enlightenment of the present utility model, without departing from this utility model ancestor
In the case of purport and scope of the claimed protection, it may also be made that a lot of form, it is new that these belong to this practicality
Within the protection of type.
Claims (5)
1. a distribution system active capacity balancer, described distribution system includes being connected with high voltage bus
At least one grid branch, each grid branch is provided with a distribution transformer, distribution transformer
Input is connected with high voltage bus and outfan is connected with load, it is characterised in that described device is connected to two
Between the outfan of individual distribution transformer, described device includes:
First reversible transducer, the dc bus in attachment means and one of them distribution transformer, for steady
Determine the voltage of dc bus and corresponding distribution transformer is carried out reactive-load compensation；
Second reversible transducer, connects described dc bus and another distribution transformer, is used for controlling to gain merit
The size and Orientation of electric current and corresponding distribution transformer is carried out reactive-load compensation；
Voltage sampling unit, the voltage of described dc bus of sampling；
First current sampling unit, connects with one end being connected with distribution transformer of the first reversible transducer,
Sample the output electric current of the first reversible transducer；
Second current sampling unit, connects with one end being connected with distribution transformer of the second reversible transducer,
Sample the output electric current of the second reversible transducer；
First controller, connects voltage sampling unit, the first current sampling unit and the first two-way change respectively
Parallel operation, becomes for voltage based on dc bus, the output electric current of the first reversible transducer, corresponding distribution
The reactive power of the load that depressor is carried drives the first reversible transducer work；
Second controller, connects the second current sampling unit and the second reversible transducer respectively, for based on
The active power of load that two distribution transformers are carried, the output electric current of the second reversible transducer, corresponding
The reactive power of the load that distribution transformer is carried drives the second reversible transducer work.
Distribution system active capacity balancer the most according to claim 1, it is characterised in that institute
State the first reversible transducer and the second reversible transducer all includes: be N number of brachium pontis, N number of first electric capacity, N number of
First inductance, N number of second inductance, N number of reactance, two bus capacitors, wherein N is the integer of 1-3；
Each brachium pontis includes that brachium pontis, lower brachium pontis, the first diode and the second diode, upper brachium pontis and lower brachium pontis are equal
Including: the device for power switching of two concatenations and inverse parallel fly-wheel diode on each device for power switching；
Two bus capacitors are serially connected between positive direct-current bus and negative dc bus, the connection of two bus capacitors
Node is as the midpoint of dc bus；The end that controls of all of device for power switching is controlled with corresponding first respectively
Device processed/second controller connects, the connection node and the one or two of two device for power switching of each upper brachium pontis
The negative pole of pole pipe connects, two device for power switching of each lower brachium pontis connect node and the second diode
Positive pole connects, and the positive pole of the first diode and the negative pole of the second diode are connected to the midpoint of dc bus；N
First end of individual first electric capacity is connected to the midpoint of dc bus, the second end of N number of first electric capacity respectively with
First end of N number of first inductance and the first end of N number of second inductance connect, the second of N number of first inductance
End is respectively connecting at the upper brachium pontis of N number of brachium pontis and the connection node of lower brachium pontis, the second of N number of second inductance
End point is connected with the outfan of distribution transformer by N number of reactance.
Distribution system active capacity balancer the most according to claim 2, it is characterised in that institute
Stating device for power switching is audion.
Distribution system active capacity balancer the most according to claim 1, it is characterised in that institute
State the first controller and second controller is PI controller.
Distribution system active capacity balancer the most according to claim 1, it is characterised in that institute
State the first reversible transducer and/or the second reversible transducer to be become with corresponding distribution by an isolating transformer
Depressor connects.
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| CN201620435272.9U CN205791545U (en) | 2016-05-12 | 2016-05-12 | A kind of distribution system active capacity balancer |
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| CN201620435272.9U CN205791545U (en) | 2016-05-12 | 2016-05-12 | A kind of distribution system active capacity balancer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811434A (en) * | 2016-05-12 | 2016-07-27 | 深圳市盛弘电气股份有限公司 | Active capacity balancing device and balancing method of power distribution system |
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2016
- 2016-05-12 CN CN201620435272.9U patent/CN205791545U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811434A (en) * | 2016-05-12 | 2016-07-27 | 深圳市盛弘电气股份有限公司 | Active capacity balancing device and balancing method of power distribution system |
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