CN107154637A - A kind of control device and method for being applied to regulation three-phase imbalance - Google Patents
A kind of control device and method for being applied to regulation three-phase imbalance Download PDFInfo
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- CN107154637A CN107154637A CN201710579548.XA CN201710579548A CN107154637A CN 107154637 A CN107154637 A CN 107154637A CN 201710579548 A CN201710579548 A CN 201710579548A CN 107154637 A CN107154637 A CN 107154637A
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
Present invention relates particularly to a kind of control device and method for being applied to regulation three-phase imbalance, a kind of control device for being applied to regulation three-phase imbalance, including active SVG module for compensating circuit and 3 tunnel capacitance adjustment circuits；The method of control includes an active SVG module for compensating：According to three phase unbalance current, active SVG module for compensating circuit is first compensated to out-of-balance current.Two passive capacitive coupling regulations：Watt current size is shifted according to three phase unbalance current and capacitive coupling, then capacitance adjustment is carried out to three phase unbalance current；Three active SVG modules are compensated again：Such as step 2 is acted without capacitive coupling switching, and active SVG modules keep step one, if step 2 has the action of capacitive coupling switching, calculates the out-of-balance current after capacitive coupling is adjusted, and the active remaining fundamental wave of SVG module for compensating is uneven.The present invention can accurately detect three phase unbalance current, and three-phase imbalance is adjusted with a wide range of precise and power factor is improved.
Description
Technical field
Field is administered the present invention relates to three-phase imbalance, specifically, is related to and a kind of is applied to regulation three-phase imbalance
Control device and method.
Background technology
In current city and Rural Power Distribution Network, a large amount of presence and power network preconsolidation stress due to single-phase load are imperfect, deposit
In serious three-phase watt current imbalance problem.Meanwhile, energy imbalance may also due to three phase mains load imbalance,
It is probably that some large-scale three-phase equipments are operated under the conditions of unbalanced power grid and caused, the equipment such as the arc-welding in industry causes
There is serious imbalance in power network.Three-phase imbalance can cause many drawbacks：(1) cause neutral line current excessive, heating is serious, line
The problems such as electrical equipment utilization ratio such as road, transformer is relatively low；(2) due to the presence of inductive load, cause transformer efficiency because
Number is relatively low.Improving the quality of power supply, reduction energy consumption, oneself turns into the common recognition of country and industrial economy every profession and trade by warp, existing in the market
Passive capacitive adjusting means, but it is main based on reactive-load compensation, and regulation is uneven limited in one's ability.Therefore, three-phase imbalance is developed
Self-checking device, it can compensate for the trend that uncompensated load turns into inevitable.
Compensated at present for three-phase imbalance, prior art there are following three kinds：
Prior art one：The disclosed static nothing for suppressing unbalanced load of Publication No. CN103475004A patent document
Work(generator SVG and its control method, this method use three-phase four-leg inverter, utilize the electric current based on Instantaneous Power Theory
Detection method, the watt current, reactive current and zero sequence compensation electric current of system, computations are gone out through Clarke, Park transformation calculations
Electric current, the compensation out-of-balance current needed is exported by inverter, and the method for this pure active module embedded therein compensating three-phase unbalance is right
For power grid user, because imbalance compensation capacity requirement is larger, if all higher using active compensation cost, it is difficult to receive
Use on a large scale.
Prior art two：Capacitive coupling three-phase imbalance and nothing disclosed in Publication No. CN105811441A patent document
Work(controlling device and method, this method use capacitive coupling and phase zero capacitance, administer three phase network imbalance, this method is due to adopting
With purely capacitive regulation thus produce precision, can not effectively by degree of unbalancedness regulation within 5%, while the compensation response time it is slow
The problem of.
Prior art three：A kind of low voltage electric network three-phase imbalance disclosed in Publication No. CN105406494A patent document
Current compensation method and device, this method compensate negative-sequence current by switching capacitive coupling device, are mended by Active Power Filter-APF
Zero-sequence current is repaid, this method adds additional zero sequence separation transformer, add cost.
In the existing scheme of above-mentioned three kinds of three-phase imbalances compensation, all have the shortcomings that certain.Therefore need a kind of mixed
The three-phase imbalance compensation device of mould assembly, both including passive capacitive coupling, includes active module embedded therein SVG, can accurately detect again
Three phase unbalance current, while ensure that lower cost, a wide range of adjustment power network power distribution network three-phase imbalance and raising
Power factor, precision can be guaranteed again.
The content of the invention
1st, technical problem to be solved：
For the defect of prior art, the present invention provides a kind of control device for being applied to regulation three-phase imbalance and side
Method, both including passive capacitive coupling, includes active SVG modules again；The present invention can accurately detect three phase unbalance current,
While ensure that lower cost, a wide range of adjustment power network power distribution network three-phase imbalance and raising power factor, and precision
It can be guaranteed again.
2nd, technical scheme：
A kind of control device for being applied to regulation three-phase imbalance, including active SVG module for compensating circuit and 3 road electric capacity are adjusted
Economize on electricity road；The active SVG module for compensating circuit is electrically connected with three-phase；The capacitance adjustment circuit is electrically connected with three-phase；
It is described to include between three capacitive couplings, three capacitive couplings being delta connection, three per road capacitance adjustment circuit
Picking out for angular connection is a little connected with one in three-phase electricity respectively；Each capacitive coupling and a split-phase IGCT string
Triangle connection is carried out after connection again.
Further, the active SVG module for compensating circuit includes active SVG modules and fuse；The active SVG moulds
Block is electrically connected by fuse with three-phase.
A kind of control method for being applied to regulation three-phase imbalance, comprises the following steps
Step 1: active SVG module for compensating：The three phase unbalance current obtained according to extraction, active SVG module for compensating electricity
Road is first responded, and out-of-balance current is compensated.Current value is extracted in the present invention to automatically extract for system.
Step 2: passive capacitive coupling regulation：Obtained three phase unbalance current is extracted, if the three-phase imbalance is electric
Stream is more than capacitive coupling and shifts watt current size, then capacitance adjustment is carried out to three phase unbalance current, so as to adjust electric current
Active imbalance；If the electric current after the compensation is not more than capacitive coupling transfer watt current size, regulation terminates.
Step 3: active SVG modules are compensated again：If step 2 is without the action of capacitive coupling switching, active SVG modules holding
Step one, if step 2 has the action of capacitive coupling switching, the out-of-balance current after capacitive coupling regulation, active SVG modules are calculated
Compensate remaining fundamental wave uneven.
Further, capacitance adjustment method includes in above-mentioned steps two：
According to Fourier decomposition, i will be loadedLa(t),iLb(t),iLc(t), it is expressed as form：
Wherein
As n=1, the fundamental active current DC quantity in the load current is：
According to three-phase watt current DC quantity, active imbalance between calculating AB, BC, CA for obtaining three-phase current per two-phase
Size of current is respectively IPAB、IPBC、IPCA；
Calculated according to the rated capacity, rated voltage, line voltage of capacitive coupling and obtain capacitance current；
The size that electric capacity shifts watt current is calculated using time-vector method：When the alternate access single-phase capacitances of AB, A subtracts each other
Small watt current IAP, B phases increase active power IBP；When the alternate access single-phase capacitances of BC, B phases reduce watt current IBP,
C phases increase watt current ICP；When the alternate access single-phase capacitances of CA, C phases reduce watt current ICP, A phases increase active electricity
Flow IAP；
By setting the switching thresholding Ith for the split-phase IGCT connected with each electric capacity, according to active between AB, BC, CA
Out-of-balance current size IPAB, IPBC, IPCA, with switching thresholding Ith, are mended, control is corresponding if out-of-balance current is owed to mend or crossed
Electric capacity circulation input or cut off, realize capacitive coupling adjust the active out-of-balance current of three-phase process.
Further, the value of the switching thresholding Ith is that corresponding watt current adds specific allowance.
3rd, beneficial effect：
(1) present invention not only has and three phase unbalance current is responded by active SVG modules, and passes through alternate electricity
Hold transfer watt current, regulation three-phase imbalance, finally again by the remaining fundamental wave out-of-balance current of active SVG module for compensating,
It is achieved thereby that the three-phase imbalance compensation of mixed type.It is small that this programme can be prevented effectively from active module embedded therein capacity, cost it is high and
Idle module low-response, the problem of precision is low.
(2) after the present invention is by capacitance adjustment three-phase imbalance, then it is negative by the active remaining three-phase of SVG module for compensating
Sequence electric current and zero-sequence current, compensating three-phase unbalance.
(3) present invention is by the fundamental active component in the load current that obtains three-phase current Fourier transformation, nothing
Work(component carries out coordinate transform respectively, obtains fundamental wave zero sequence electric current, fundamental negative sequence current, and active module embedded therein compensates remaining fundamental wave and born
Sequence electric current and fundamental wave zero sequence electric current, realize active module embedded therein fundamental wave imbalance compensation.
Brief description of the drawings
Fig. 1 is a kind of control device principle schematic diagram for being applied to regulation three-phase imbalance of the present invention；
Fig. 2 is a kind of block diagram for the control method for being applied to regulation three-phase imbalance of the present invention；
Fig. 3 for the present invention in using time-vector method calculate electric capacity shift watt current polar plot.
Embodiment
It is as shown in Figure 1 a kind of control device principle schematic diagram for being applied to regulation three-phase imbalance in the present invention,
Device as shown in Figure 1 includes active SVG module for compensating circuit and 3 tunnel capacitance adjustment circuits；The active SVG module for compensating circuit
It is electrically connected with three-phase；The capacitance adjustment circuit is electrically connected with three-phase；It is described to include three alternate electricity per road capacitance adjustment circuit
Hold, be delta connection between three capacitive couplings, picking out for delta connection is a little connected with the one of three-phase electricity respectively；It is described
Each capacitive coupling is connected with carrying out triangle after a split-phase Thyristors in series again.Each split-phase IGCT individual-phase control with
Series connection electric capacity input or excision so that carry out it is passive regulation three-phase imbalance watt current；A-SVG is active SVG moulds
Block, realizes the effect of active compensation out-of-balance current.The three-phase imbalance electricity that active SVG module for compensating circuit is obtained according to extracting
Stream, active SVG module for compensating circuit first responds, out-of-balance current is compensated.The three-phase that capacitance adjustment circuit extraction is obtained
Out-of-balance current, if the three phase unbalance current is more than capacitive coupling and shifts watt current size, to three-phase imbalance
Electric current carries out capacitance adjustment, so as to adjust the active imbalance of electric current；If the electric current after the compensation is not more than capacitive coupling
Watt current size is shifted, regulation terminates.
Three-phase imbalance self-regulating process as shown in Figure 2.As can be seen from the figure when three-phase imbalance load increases,
Active SVG modules are first responded, and compensate current imbalance；If three phase unbalance current shifts active more than capacitive coupling in load
During size of current, adjusted by the control input capacitive coupling regulation of split-phase IGCT so as to carry out active imbalance；Finally, it is active
The remaining fundamental wave out-of-balance current of SVG module for compensating.
As Fig. 3 for the present invention in using time-vector method calculate electric capacity shift watt current polar plot.Wherein electric capacity C
AB two-phase of the two ends respectively with three-phase electricity be electrically connected, it can be seen that A phases reduce watt current I from figureAP, B phases increase
Active power IBP。
Although the present invention disclosed as above with preferred embodiment, they be not for limit the present invention, it is any ripe
This those skilled in the art is practised, without departing from the spirit and scope of the invention, can make various changes or retouch from working as, therefore the guarantor of the present invention
What shield scope should be defined by claims hereof protection domain is defined.
Claims (5)
1. a kind of control device for being applied to regulation three-phase imbalance, it is characterised in that：Including active SVG module for compensating circuit and
3 tunnel capacitance adjustment circuits；The active SVG module for compensating circuit is electrically connected with three-phase；The capacitance adjustment circuit and three-phase electricity
It is connected；
It is described to include between three capacitive couplings, three capacitive couplings being delta connection, triangle per road capacitance adjustment circuit
Picking out for connection is a little connected with the one of three-phase electricity respectively；
Each capacitive coupling is connected with carrying out triangle after a split-phase Thyristors in series again.
2. a kind of control device for being applied to regulation three-phase imbalance according to claim 1, it is characterised in that：It is described to have
Source SVG module for compensating circuit includes active SVG modules and fuse；The active SVG modules pass through fuse and three-phase electricity phase
Even.
3. a kind of control method for being applied to regulation three-phase imbalance, it is characterised in that：
Comprise the following steps
Step 1: active SVG module for compensating：：The three phase unbalance current obtained according to extraction, active SVG module for compensating circuit
First respond, out-of-balance current is compensated；
Step 2: passive capacitive coupling regulation：Obtained three phase unbalance current is extracted, if the three phase unbalance current is big
Watt current size is shifted in capacitive coupling, then capacitance adjustment is carried out to three phase unbalance current, so as to adjust the active of electric current
It is uneven；If the electric current after the compensation is not more than capacitive coupling transfer watt current size, regulation terminates；
Step 3: active SVG modules are compensated again：If step 2 is without the action of capacitive coupling switching, active SVG modules holding step
One, if step 2 has the action of capacitive coupling switching, calculate the out-of-balance current after capacitive coupling regulation, active SVG module for compensating
Remaining fundamental wave out-of-balance current.
4. a kind of control method for being applied to regulation three-phase imbalance according to claim 3, it is characterised in that：It is electric in step 2
Hold adjusting method to specifically include：
According to Fourier decomposition, i will be loadedLa(t),iLb(t),iLc(t), it is expressed as form：
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Wherein
As n=1, the fundamental active current DC quantity in the load current is：
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According to three-phase watt current DC quantity, active out-of-balance current between calculating AB, BC, CA for obtaining three-phase current per two-phase
Size is respectively IPAB、IPBC、IPCA；
Calculated according to the rated capacity, rated voltage, line voltage of capacitive coupling and obtain capacitance current；
The size that electric capacity shifts watt current is calculated using time-vector method：When the alternate access single-phase capacitances of AB, A phases are reduced
Watt current IAP, B phases increase watt current IBP；When the alternate access single-phase capacitances of BC, B phases reduce watt current IBP, C phases
Increase watt current ICP；When the alternate access single-phase capacitances of CA, C phases reduce watt current ICP, A phases increase watt current
IAP；
By setting the switching thresholding Ith for the split-phase IGCT connected with each electric capacity, according to active injustice between AB, BC, CA
The size of current that weighs IPAB、IPBC、IPCA, with switching thresholding Ith；If out-of-balance current is owed to mend or crossed and mends, corresponding electric capacity is controlled to throw
Enter or cut off, realize the capacitive coupling regulation active unbalanced process of three-phase.
5. a kind of control method for being applied to regulation three-phase imbalance according to claim 4, it is characterised in that：The switching door
Limit Ith value and add specific allowance for corresponding watt current.
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| CN201710579548.XA CN107154637B (en) | 2017-07-17 | 2017-07-17 | Control device and method applied to three-phase unbalance adjustment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710579548.XA CN107154637B (en) | 2017-07-17 | 2017-07-17 | Control device and method applied to three-phase unbalance adjustment |
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| CN107154637A true CN107154637A (en) | 2017-09-12 |
| CN107154637B CN107154637B (en) | 2023-09-01 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201584790U (en) * | 2009-12-28 | 2010-09-15 | 苏州工业园区和顺电气股份有限公司 | Low-voltage dynamic reactive power compensation device |
| CN205986164U (en) * | 2016-07-27 | 2017-02-22 | 河南隆鑫电力设备有限公司 | Balanced compensation arrangement of intelligence |
| CN207320843U (en) * | 2017-07-17 | 2018-05-04 | 南京亚派科技股份有限公司 | A kind of control device for being applied to adjust three-phase imbalance |
-
2017
- 2017-07-17 CN CN201710579548.XA patent/CN107154637B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201584790U (en) * | 2009-12-28 | 2010-09-15 | 苏州工业园区和顺电气股份有限公司 | Low-voltage dynamic reactive power compensation device |
| CN205986164U (en) * | 2016-07-27 | 2017-02-22 | 河南隆鑫电力设备有限公司 | Balanced compensation arrangement of intelligence |
| CN207320843U (en) * | 2017-07-17 | 2018-05-04 | 南京亚派科技股份有限公司 | A kind of control device for being applied to adjust three-phase imbalance |
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