CN107171325A - A kind of plug and play integrated modular active harmonics isolator - Google Patents
A kind of plug and play integrated modular active harmonics isolator Download PDFInfo
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- CN107171325A CN107171325A CN201710365132.8A CN201710365132A CN107171325A CN 107171325 A CN107171325 A CN 107171325A CN 201710365132 A CN201710365132 A CN 201710365132A CN 107171325 A CN107171325 A CN 107171325A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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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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Abstract
The invention discloses a kind of plug and play integrated modular active harmonics isolator, including：Current detection module, inversion control module and special transformer；Fundamental current and the feedback current that voltage is produced after special transformer secondary side is applied by inverter that current detection module is used to detect in networking electric current；Special transformer includes first side winding and secondary side winding, wherein, first side winding accesses power network, secondary side winding axially coiling as busbar, and is connected with the output end of inversion control module；The input connection DC voltage of inversion control module, the control end of inversion control module is connected to the output end of the current detection module, and the inversion control module is used to export the control voltage for controlling the transformer secondary side to produce feedback current according to reference current signal.The present invention is using the access way of remain silent current transformer type or open-core transformer formula, and access is simply and on this body structure of power network without influence.
Description
Technical field
The invention belongs to Active Power Filter-APF technical field, and in particular to a kind of active harmonics isolator.
Background technology
The active demand of green energy resource and energy-conserving and environment-protective has promoted the development of Power Electronic Technique, and power electronic equipment belongs to
Non-linear device, harmonic wave and power factor problem can hardly be avoided, and passive power filter and Active Power Filter-APF are to grind at present
Study carefully two kinds of at most most ripe and most widely used filters solutions.Passive filter technology maturation, with low cost, reliability is high, can
For high and low pressure system；In actual applications, passive filter has following deficiency：
1) filter effect is highly dependent upon the internal resistance of system, and system internal resistance is very small in low-pressure system, and filter effect is big to give a discount
Button；
2) a LC branch road can only compensate the harmonic wave of certain frequency, and filtering of the Design of Passive Power Filter in order to reach needs is imitated
Fruit is, it is necessary to which the filter branch number of installing a lot, adds the risk of resonance while exacerbating design difficulty；
3) system internal impedance and passive filter may produce resonance, cause some Harmonics amplifications；
4) immobilized once being installed on power network, Mobile state compensation cannot be entered to the harmonic current (voltage) of change；
5) weight and volume are larger etc..
In order to solve the disadvantages mentioned above of passive filter, scholars propose the concept of Active Power Filter-APF, active electrical
Force filter can carry out quick tracing compensation to the harmonic wave of different size and frequency simultaneously, and multiple harmonic can be filtered out simultaneously,
Independent of system impedance, resonance will not be caused, the disadvantages mentioned above of passive filter is solved substantially, but in actual applications again
Encounter following point：
1) active filter cost is higher, is currently used primarily in low-pressure system；
2) high-frequency converter that shunt active power filter is used is essentially boost principle, so
DC bus-bar voltage is higher, reduces the reliability of system；
3) either voltage-type harmonic source or current mode harmonic source, can cause the enlarge-effect of load current；
4) for voltage-type harmonic load it is also possible to there is the phenomenon of secondary wave head.
Above-mentioned passive filter and active filter are typically all to be connected in parallel on power system, and parallel connection type filter is general only
It is suitable for the filtering of current source type harmonic source, but the background harmonicses of bulk power grid or new energy access system can not be suppressed.From into
The combined factors such as this and reliability consider that Active Power Filter-APF is mainly used in low-pressure system, and passive filter can be used for
High pressure and low-pressure system.In general filter out the feasible method of higher hamonic wave be exactly in the line connect an AC inductance or
A filter capacitor in parallel, both above scheme is exactly the low pass branch road for building a harmonic wave, and many electronic equipments are in order to anti-
Only the principle of one magnetic bead of electromagnetic compatibility series connection is the same.The uncontrollable rectifier device of some current middle low powers just has connects in the line
4% or so inductance suppresses the concrete application of harmonic wave, but series inductance also has one while isolated harmonic wave in the line
Fixed fundamental wave pressure drop, is that this makes its fundamental wave pressure drop very small we have proposed the thought based on fundamental flux compensation, to circuit base
This does not influence.But the Active Power Filter-APF series connection based on fundamental flux compensation is in the line, line attachment is inconvenient, because
Here propose a kind of active harmonics isolator of plug and play, using the access of special transformer (being similar to current transformer)
Mode, transformer primary side is the power network line of a circle, does not change the original line construction of grid side so, only changes transformer
Core length, reach harmonic wave isolation effect.
The content of the invention
For the defect of prior art, it is an object of the invention to provide a kind of plug and play integrated modular active harmonics
Isolator, it is intended to the problems such as solving harmonic wave caused by non-linear device and low power factor.
The invention provides a kind of plug and play integrated modular cascade active compensator, including：Current detection module, it is inverse
Become control module and special transformer；The current detection module is used to detect fundamental current in networking electric current and by inverse
Become device and apply the feedback current that voltage is produced after special transformer secondary side；The special transformer include first side winding and
Secondary side winding, wherein, first side winding as busbar access power network, secondary side winding axially coiling, and with it is inverse
Become the output end connection of control module；The input connection DC voltage of the inversion control module, the inversion control mould
The control end of block is connected to the output end of the current detection module, and the inversion control module is used for according to reference current signal
Export the control voltage for controlling the transformer secondary side to produce feedback current.
Further, the current detection module includes：Fundamental Current's Detection unit, feedback current detection unit and add
Musical instruments used in a Buddhist or Taoist mass；The input of the fundamental Current's Detection unit is connected to power network, the input connection of the feedback current detection unit
To the transformer secondary side, the first input end of the adder is connected to the output end of fundamental Current's Detection unit, described
Second input of adder is connected to the output end of feedback current detection unit, and the adder is used for the fundamental current
The reference current signal is exported after being added with the feedback current.
Further, inversion control module includes：Inverter, PWM control driver elements and filter unit；The PWM
The input of control driver element is connected to the output end of the adder, and the input of the inverter connects DC voltage,
The control end of the inverter is connected to the output end that the PWM controls driver element, the input connection of the filter unit
To the output end of inverter, the output end of the filter unit connects the transformer secondary side；The PWM controls driver element
For being produced according to the reference current signal for controlling the PWM ripple signals that switching tube is turned in inverter；The inverter
It is the control voltage by DC voltage inversion under the control of the PWM ripples signal.
Further, in special transformer first side winding and secondary side winding turn ratio k=W1/W2, wherein, W1
For the number of turn of first side winding, W2For the number of turn of secondary side winding, W2More than W1。
Further, the inductance L=W of special transformer1 2μ A/l, μ are the magnetic conductivity of iron core, and A accumulates for core section, l
For the average length of magnetic path.
Further, the iron core of special transformer is elongate cylindrical shape or rectangular-shape.
The active harmonics isolator that the present invention is provided is phase structure, plug and play, using the special transformer of electric current of remaining silent
The access way of formula or the special mutual-inductor type of opening；Module is integrated, the fixed DC bus-bar voltage by inverter at the beginning of this programme
Rectifier makes a module standardized together with inverter design, and with the current transformer of particular design, if being
The impedance of system is not enough, can be several with many series connection in direct-on-line road.
Inversion control module is used as it after the special transformer primary side fundamental current detected is multiplied by into a gain coefficient
Instruction current, then electronic power inverter produce a fundamental current and be applied to the secondary side of special transformer, what it was exported
Electric current passes through a special mutual inductor unit access system after a LC filter circuit.
The special special iron core of transformer is cut in elongate cylindrical shape or rectangular-shape with reducing the average length of magnetic path, increase magnetic circuit
Area, so as to increase primary side equiva lent impedance.Conventional current transformer only plays the detection function of current, therefore its core length ratio
It is shorter.The special transformer that this programme is proposed mainly plays harmonic wave buffer action, if using conventional current transformer structure, will lead
Cause transformer primary side equiva lent impedance too small, do not have the effect of harmonic wave isolation, so this programme is using increase current transformer
Iron core length obtain a special transformer, make grid side equiva lent impedance meet requirement.In actual applications, can be according to need
The amplitude and number of times for the harmonic wave to be filtered out carry out the specific practical structures size for determining transformer.
It during work, by adjusting α, just can change the magnetic potential of special transformer secondary side, thus change special transformer
Stepless adjustable impedance will be presented in main flux in iron core, the primary side of special transformer.Its leakage that very little is presented to fundamental wave hinders
Anti-, fundamental wave can normally circulate, and very big excitation impedance is presented to harmonic wave, prevent harmonic wave from flowing into grid side, play harmonic wave isolation
Effect.
Plug and play integrated modular active harmonics isolator of the present invention compares master with existing series connection mode filter
There are following features：
(1) plug and play, using the access way of remain silent current transformer type or open-core transformer formula, access it is simple and
On this body structure of power network without influence.
(2) specially made structure, conventional current transformer mainly plays current detecting, therefore its core length is shorter.
The special transformer that this programme is proposed mainly plays harmonic wave isolation, if using conventional current transformer structure, will cause
Transformer primary side equiva lent impedance is too small, does not have the effect of harmonic wave isolation, so this programme is using increase current transformer iron
The length of core obtains a special transformer, grid side equiva lent impedance is met requirement.
(3) control is improved, one and once is injected using active by the way of by the secondary side in special current transformer
Side power frequency is identical, opposite in phase electric current, changes the stool and urine of the secondary side Injection Current of special transformer and can realize spy
The continuously adjustabe of electric current main flux processed, so as to realize the continuously adjustabe of special transformer primary side impedance.
(4) module is integrated, and the rectifier and inverter design of the fixed DC bus-bar voltage by inverter at the beginning of this programme are one
Rise, and the module of a standardization is made with the current transformer of particular design, can be with if the impedance of harmonic wave isolator is not enough
Many series connection are several in direct-on-line road is used together.
(5) wireless telecommunications are realized, when module is used for three-phase system, phase relation passes through wireless telecommunications between disparate modules
Transmitted；When multiple modules are used for monophase system, the magnitude relationship of the compensation rate between disparate modules passes through wireless telecommunications
Transmitted.
(6) high-low pressure is general, and active filter is generally used for low-pressure system, but the present invention can be not only used for low-pressure system
Available for high-pressure system.
Brief description of the drawings
Fig. 1 active harmonics isolators proposed by the present invention couple the single-phase principle electricity for accessing power network by special transformer
Road；
Fig. 2 is special transformer Fundamental Wave Equivalent Circuit figure；
Fig. 3 is special transformer harmonics equivalent circuit diagram；
Fig. 4 (a) and (b) are respectively that primary side, the secondary side of the special transformer of columnar iron core of remaining silent proposed by the present invention show
It is intended to；Wherein, (a) is the special transformer primary side structural representation of hollow cylinder iron core of remaining silent, and (b) is open column shape iron of remaining silent
The special transformer secondary lateral structure schematic diagram of core；
Fig. 5 (a) and (b) are respectively that primary side, the secondary side of the opening special transformer of columnar iron core proposed by the present invention show
It is intended to；Wherein, (a) is the special transformer primary side structural representation of open hollow columnar iron core, and (b) is open hollow column iron
The special transformer secondary lateral structure schematic diagram of core；
Fig. 6 (a) and (b) are respectively the primary side, secondary of the special transformer of remaining silent proposed by the present invention suitable for busbar
Side schematic diagram；Wherein, (a) is the special transformer primary side structural representation of remaining silent suitable for busbar；(b) it is suitable for busbar
Special transformer secondary lateral structure schematic diagram of remaining silent；
Fig. 7 (a) and (b) are respectively the primary side, secondary of the opening special transformer proposed by the present invention suitable for busbar
Side schematic diagram；Wherein, (a) is the special transformer primary side structural representation of opening suitable for busbar；(b) suitable for busbar
Be open special transformer secondary lateral structure schematic diagram；
Fig. 8 is present invention access three-phase system structural representation；
Wherein, 1 is grid line, and 2 be cylinder iron core, and 3 be secondary winding, and 4 be busbar, and 5 be cuboid iron core.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Principle of the invention based on a kind of controllable REgulatable reactor of magnetic flux, by special transformer of the iron core with air gap
Secondary side inject an electric current identical with primary side current frequency, opposite in phase by the way of active, change it is special mutually
The stool and urine of the secondary side Injection Current of sensor can realize the continuously adjustabe of transformer main flux, so as to realize transformer primary side
The continuously adjustabe of impedance.Compared with existing REgulatable reactor, when in transformer iron core carry air gap when, the magnetic flux it is controllable can
Adjust reactor there is no saturated phenomenon, harmonic wave is not produced and the stepless adjustable of reactance value can be realized.But when the magnetic flux is controllable
When REgulatable reactor is used as active harmonics isolator, its primary side is needed to connect in access power network, it is necessary to grid power blackout and break
Power network line is opened, the original structure of power network is changed.
Power network is easily accessed for active harmonics isolator and does not change the original structure of power network, and the present invention proposes one kind
Pluging and playing module active harmonics isolator.
The single-phase active harmonic wave isolator that the present invention is provided includes：Current detection module, inversion control module and it is special mutually
Sensor；Fundamental current and special transformer two is applied to by inverter that current detection module is used to detect in networking electric current
The feedback current produced behind secondary side；Special transformer includes first side winding and secondary side winding, wherein, first side winding conduct
Busbar accesses power network, secondary side winding axially coiling, and is connected with the output end of inversion control module；Inversion control
The input connection DC voltage of module, the control end of inversion control module is connected to the output end of current detection module, inverse
Becoming control module is used to export the control for controlling the transformer secondary side to produce feedback current according to reference current signal
Voltage.
Current detection module includes：Fundamental Current's Detection unit, feedback current detection unit and adder；Fundamental current is examined
The input for surveying unit is connected to power network, and the input of feedback current detection unit is connected to the transformer secondary side, addition
The first input end of device is connected to the output end of fundamental Current's Detection unit, and the second input of adder is connected to feedback current
The output end of detection unit, adder is used to export the reference current after the fundamental current is added with the feedback current
Signal.
Inversion control module includes：Inverter, PWM control driver elements and LC filter units；PWM controls driver element
Input be connected to the output end of the adder, the input connection DC voltage of inverter, the control end of inverter connects
The output end that the PWM controls driver element is connected to, the input of filter unit is connected to the output end of inverter, filter unit
Output end connect the transformer secondary side；PWM control driver elements are used to be produced according to the reference current signal to be used for
Control the PWM ripple signals that switching tube is turned in inverter；Inverter is under the control of the PWM ripples signal, by DC voltage
Inversion is the control voltage.
The primary side of special transformer is the power circuit of power network, is connected between power network and load, secondary side connection
To the output end of inversion control module.
Fundamental Current's Detection module includes：Current transformer I and fundamental Current's Detection link.In the secondary of special transformer
Side is connected around circle coil formation current transformer, the output of current transformer with the input of fundamental Current's Detection link, base
Ripple current detecting unit will detect that fundamental current signal, as element output signal, is sent from special transformer primary side current
Enter the current gain circuit of inversion control module.
Inversion control module is used as it after the special transformer primary side fundamental current detected is multiplied by into a gain coefficient
Instruction current, then electronic power inverter produce a flux compensation electric current and be applied to the secondary side of special transformer, its is defeated
The electric current gone out passes through a special mutual inductor unit access system after a LC filter circuit.LC filter circuits are used to suppress
The high frequency ripple that inverter is produced.
The control voltage that special mutual inductor unit is used to export Inverter control module produces fundamental wave benefit by transformer
Electric current is repaid to be linked into system.
DC bus-bar voltage UdAcquisition can pass through three kinds of modes：(1) power taking is sensed on the spot；(2) by inverter
Control come control active power flow into inverter, so as to realize to UdControl；(3) direct current is directly accessed with battery female
Line side, by realizing the constant of busbar voltage to inverter control.
The operation principle of the present invention, (gain of the link is set as k by fundamental Current's Detection uniti) detect transformation
The fundamental current of device primary sideWillIt is used as reference signalOne current source is produced by electronic power inverter(current source can be usedTo represent, α is the fundamental wave of transformer primary side current and the ratio system of secondary side current
Number).WillBy transformer series between the harmonious wave source of system.By adjusting α for 1, then the series transformer primary side pair
Fundamental wave is rendered as primary side leakage impedance (the value very little does not influence substantially on system), and high impedance is rendered as to harmonic wave, the height
Impedance is mainly shown as induction reactance property, increases with the increase of overtone order.
For the plug and play integrated modular active harmonics isolator that the further description present invention is provided, tie below
Close accompanying drawing and instantiation is specifically further illustrated to active harmonics isolator principle and special transformer in detail：
As shown in figure 1, the number of turn for being located at special transformer iron core last time side winding AX is W1(being herein 1), it is secondary
The side winding ax number of turn is W2, then the turn ratio k=W of primary side and secondary side1/W2.If the primary side AX of this special transformer is gone here and there
It is connected between power network and a load, then just has electric current i in its primary side1Flow through.By detecting special transformer primary side
Electric current i1, and track this electric current to produce an electric current i using a voltage source inverter2, by i2Antiphase injection is special mutually
The secondary side of sensor.The T-shaped equivalent circuit of this special transformer (i as shown in Figure 22It is after converting special transformer primary side
i2'), wherein:Z1=r1+jx1It is the leakage impedance of primary side AX coils；Z'2=r'2+jx'2Converted for special transformer secondary side
To the leakage impedance of primary side；Zm=rm+jxmFor special transformer excitation impedance.
Discussed respectively for fundamental wave harmonic below according to principle of stacking：
1) for fundamental wave, because series transformer secondary side is equivalent to a controlled fundamental current sourceIts etc.
Imitate circuit as shown in Figure 2.The equiva lent impedance of fundamental wave is
When the fundamental wave of α=1 is compensated entirely, the impedance value is the primary side leakage reactance Z of very little1, system is not influenceed substantially,
During harmonic wave isolator normal work, α value is 1.
2) for harmonic wave, in Circuit Fault on Secondary Transformer equivalent to open circuit (i.e. the situation of α=0), then active power filter system
It is as shown in Figure 3 for the equivalent circuit of harmonic wave.For arbitrary nth harmonic, the harmonic wave equiva lent impedance of transformer primary side is
Because the excitation impedance Z of transformermMuch larger than leakage reactance Z1, so transformer primary side is rendered as high impedance to harmonic wave,
And increase with the increase of overtone order；Active harmonics isolator is connected between system and harmonic source load, is improved and is
The impedance united to harmonic wave, serves the effect of harmonic wave isolation.
Due to the active harmonics isolator series connection based on fundamental flux compensation in the line, line attachment is inconvenient, so
Proposition replaces series transformer using special transformer.Fig. 4 (a) and (b) are the special mutual inductance utensil of hollow cylinder iron core of remaining silent
Body structure chart, wherein (a) figure is transformer iron core and grid line schematic diagram, (b) figure is transformer secondary side winding on iron core
Around drawing, axially carry out coiling along iron core；Fig. 5 (a) and (b) are the special transformer concrete structure of open hollow cylinder iron core
Figure, wherein (a) figure is transformer iron core and grid line schematic diagram, (b) figure is coiling of the transformer secondary side winding on iron core
Figure, coiling is axially carried out along iron core；Fig. 6 (a) and (b) they are the special transformer concrete structure diagram of remaining silent suitable for busbar, wherein
(a) figure is transformer iron core and busbar schematic diagram, (b) figure be transformer secondary side winding on cuboid iron core around drawing,
Coiling is axially carried out along iron core；Fig. 7 (a) and (b) are the special transformer concrete structure diagram of opening suitable for busbar, wherein (a)
Figure is transformer iron core and busbar schematic diagram, (b) figure be transformer secondary side winding on cuboid iron core around drawing, along iron
Mandrel to carry out coiling.Wherein the special transformer of open type, can access power network, it is contemplated that current clamp pair in the way of current clamp
It is well known that here to schematic diagram 4 (a) and (b), 5 (a) and the tool of current clamp form in (b) for those skilled in the art
Body structure is repeated no more.Because the primary side of special transformer only has the circle of system line one, inductance L=W1 2μ A/l, (wherein W1For
The special transformer primary side number of turn, μ is the magnetic conductivity of iron core, and A is that core section is accumulated, and l is the length of magnetic path that is averaged) if with general
Logical iron core, grid side equivalent inductance is too small, so the iron core for illustrating special transformer is made into elongate cylindrical shape or rectangular-shape
To reduce the length of magnetic path, increase core section product, so as to increase inductance L.If inductance value is still unsatisfactory for requiring, can it be inserted multiple
I.e. with harmonic wave isolator series connection access power network.
Monophase system is may be referred under three-phase system, harmonic wave isolation is carried out using harmonic wave isolator in each phase.If
A certain phase line current harmonic ratio is larger, when single harmonic wave isolator filter effect is bad, can in the phase many several groups of increases this
The harmonic wave isolator of sample achieves the goal, and it is normal to ensure to carry out communication on same circuit between multiple harmonic wave isolators in addition
Work.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (7)
1. a kind of plug and play integrated modular active harmonics isolator, it is characterised in that including：Current detection module, inversion
Control module and special transformer；
Fundamental current and voltage is applied special by inverter that the current detection module is used to detect in networking electric current
The feedback current produced after transformer secondary side；
The special transformer includes first side winding and secondary side winding, wherein, first side winding accesses power network as busbar,
Secondary side winding axially coiling, and be connected with the output end of inversion control module；
The input connection DC voltage of the inversion control module, the control end of the inversion control module is connected to described
The output end of current detection module, the inversion control module is used to be exported for controlling the mutual inductance according to reference current signal
Device secondary side produces the control voltage of feedback current.
2. harmonic wave isolator as claimed in claim 1, it is characterised in that the current detection module includes：Fundamental current is examined
Survey unit I, feedback current detection unit II and adder；
The input of the fundamental Current's Detection unit is connected to power network, and the input of the feedback current detection unit is connected to
The transformer secondary side, the first input end of the adder is connected to the output end of fundamental Current's Detection unit, described to add
Second input of musical instruments used in a Buddhist or Taoist mass is connected to the output end of feedback current detection unit, the adder be used for by the fundamental current with
The feedback current exports the reference current signal after being added.
3. harmonic wave isolator as claimed in claim 2, it is characterised in that the inversion control module includes：Inverter, PWM
Control driver element and filter unit；
The input of the PWM controls driver element is connected to the output end of the adder, the input connection of the inverter
DC voltage, the control end of the inverter is connected to the output end that the PWM controls driver element, the filter unit
Input is connected to the output end of inverter, and the output end of the filter unit connects the transformer secondary side；The PWM controls
Driver element processed is used to be produced for controlling the PWM ripple signals that switching tube is turned in inverter according to the reference current signal；
DC voltage inversion is the control voltage under the control of the PWM ripples signal by the inverter.
4. the harmonic wave isolator as described in claim any one of 1-3, it is characterised in that in the special transformer primary side around
The turn ratio k=W of group and secondary side winding1/W2, wherein, W1For the number of turn of first side winding, W2For the number of turn of secondary side winding,
W2More than W1。
5. harmonic wave isolator as claimed in claim 4, it is characterised in that the inductance L=W of the special transformer1 2μ A/l, μ
For the magnetic conductivity of iron core, A accumulates for core section, and l is the average length of magnetic path, W1For the number of turn of first side winding.
6. harmonic wave isolator as claimed in claim 4, it is characterised in that the iron core of the special transformer is elongate cylindrical shape
Or rectangular-shape.
7. active harmonics isolator according to claim 1, it is characterised in that the active harmonics isolator is single-phase by three sets
Structure constitutes three-phase system, for three-phase electrical power system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638833A (en) * | 2018-11-30 | 2019-04-16 | 华中科技大学 | Plug and play Active Power Filter-APF and filtering method with high permeability material |
| CN115528692A (en) * | 2022-11-22 | 2022-12-27 | 云南电力试验研究院(集团)有限公司 | Distributed new energy self-adaptive active impedance control method and device |
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| CN103036236A (en) * | 2012-12-04 | 2013-04-10 | 湖南大学 | Control method of wide frequency range multi-type harmonic comprehensive governance system |
| CN104993484A (en) * | 2015-04-27 | 2015-10-21 | 深圳市今朝时代新能源技术有限公司 | Active electrical filter |
| CN206850431U (en) * | 2017-05-22 | 2018-01-05 | 华中科技大学 | A kind of plug and play integrated modular active harmonics isolator |
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| CN109638833A (en) * | 2018-11-30 | 2019-04-16 | 华中科技大学 | Plug and play Active Power Filter-APF and filtering method with high permeability material |
| CN115528692A (en) * | 2022-11-22 | 2022-12-27 | 云南电力试验研究院(集团)有限公司 | Distributed new energy self-adaptive active impedance control method and device |
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