CN204012736U - A kind of three-phase imbalance adjusting device - Google Patents
A kind of three-phase imbalance adjusting device Download PDFInfo
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- CN204012736U CN204012736U CN201420443246.1U CN201420443246U CN204012736U CN 204012736 U CN204012736 U CN 204012736U CN 201420443246 U CN201420443246 U CN 201420443246U CN 204012736 U CN204012736 U CN 204012736U
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- 239000003990 capacitor Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims description 16
- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 208000019901 Anxiety disease Diseases 0.000 description 2
- 230000036506 anxiety Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000001915 proofreading effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
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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
Abstract
The utility model relates to a kind of three-phase imbalance adjusting device, comprises control unit, for gathering the current transformer of A, B, C threephase load end current signal, for driving IGBT control circuit, the first to the 6th IGBT, bus capacitor and first to the 3rd reactance of IGBT conduction and cut-off; The input of control unit is connected with the output of current transformer, and the output of control unit is connected to the input of IGBT control circuit; The one IGBT is connected to the two ends of described bus capacitor after being connected in series mutually with the 6th IGBT with the 4th IGBT and the 5th IGBT with the 2nd IGBT, the 3rd IGBT, the tie point of an IGBT and the 2nd IGBT, the 3rd IGBT and the 4th IGBT and the 5th IGBT and the 6th IGBT is connected to respectively C, B, A threephase load end.The utility model circuit structure is simple, is easy to realize, and can realize fast the balance of three-phase current.
Description
Technical field
The utility model relates to a kind of three-phase imbalance adjusting device.
Background technology
Tradition cross-over connection resistance between phase line and phase line, has and between phase line and phase line, shifts idle ability.Flying capcitor or inductance between phase line and phase line, have and between phase line and phase line, shift meritorious ability.
If 1 uneven active current be equivalent to AB mutually between cross-over connection one resistance, at this moment to have mutually electric current and electric current be I to AB, C phase no current.The method of proofreading and correct so this unsymmetrical current is to access an electric capacity between BC phase, and selecting capacitance to make its electric current is 0.58I, between AC phase, accesses an inductance, and selecting inductance value to make its electric current is 0.58I, so unsymmetrical current disappears.(see figure 1)
If 2 unsymmetrical currents are equivalent to cross-over connection one resistance between A phase and center line, in system at this moment, only have A to have mutually electric current I, BC is equal no current mutually.The method of proofreading and correct so this unsymmetrical current is to access an electric capacity between AB phase, selecting capacitance to make its electric current is 0.67I, between AC phase, access an inductance, selecting inductance value to make its electric current is 0.67I, between B phase and center line, access an inductance, selecting inductance value to make its electric current is 0.58I, accesses an electric capacity between C phase and center line, selecting capacitance to make its electric current is 0.58I, so unsymmetrical current disappears.(see figure 2)
If unsymmetrical current is equivalent to a not only resistance, can be as the criterion by each resistance respectively so, calculate required compensation rate, then utilize superposition principle to calculate.
The method of above-mentioned adjustment unsymmetrical current is also brought a problem, needs exactly to use inductance.In the device of adjusting unsymmetrical current, a large amount of inductance being installed is a pretty troublesome thing, inductance massiveness, and cost is very high, and loss is larger.
The existence of these inductive loads fortunately, in actual system, often has a large amount of inductive loads, exactly because just need to be carried out reactive power compensation.And load in inductance just in time can be utilized by us.Theory analysis and field experiment all show: as long as select rightly the connection of capacitor, just can reach is the object that compensation power factor is adjusted again unsymmetrical current.
Lift an example explanation below and how to connect the object that capacitor reaches not only compensating reactive power but also adjusts unsymmetrical current.
Be provided with a using electricity system as shown in Figure 3, this is the very low and unbalanced example of severe three-phase of power factor, and the power factor of three-phase is 0.71.C phase current is twice than A phase current.By seeing in figure: the total capacity of compensation condenser equals the inductance total capacity in load just, just owing to having selected rightly the connection of capacitor, thereby make the current balance type of three-phase, and the power factor of three-phase is equal to 1, zero line does not have electric current.
Summary of the invention
The purpose of this utility model is to provide a kind of circuit structure simple, is easy to realize, and can realize fast the three-phase imbalance adjusting device of the balance of three-phase current.
For achieving the above object, the technical solution of the utility model is: a kind of three-phase imbalance adjusting device, comprises control unit, for gathering the current transformer of the A, the B that are connected with electrical network output, C threephase load end current signal, for driving IGBT control circuit, the first to the 6th IGBT, bus capacitor and first to the 3rd reactance of IGBT conduction and cut-off; The input of described control unit is connected with the output of described current transformer, and the output of described control unit is connected to the input of described IGBT control circuit, and the control end of described IGBT control circuit is connected to the gate pole of the 6th IGBT with first respectively; The collector electrode of a described IGBT is connected with the emitter of the 2nd IGBT, the collector electrode of described the 3rd IGBT is connected with the emitter of the 4th IGBT, the collector electrode of described the 5th IGBT is connected with the emitter of the 6th IGBT, the emitter of a described IGBT, the emitter of the 3rd IGBT are connected to the negative pole of described bus capacitor with the emitter of the 5th IGBT, and the collector electrode of the collector electrode of described the 2nd IGBT, the 4th IGBT is connected to the positive pole of described bus capacitor with the collector electrode of the 6th IGBT; The emitter of a described IGBT is also connected to C phase load end through the first reactance, and the emitter of described the 3rd IGBT is also connected to B phase load end through the second reactance, and the emitter of described the 5th IGBT is also connected to A phase load end through the 3rd reactance.
In the utility model embodiment, the three-phase current of described electrical network output is I, and the electric current of A, B, C threephase load end is respectively
,
,
, and
+
+
=3I; When
be greater than I,
,
all be less than I, control unit is according to the side-play amount △ of A phase load end electric current
, controlled for the 6th IGBT conducting and deadline, for described bus capacitor charges until A phase load end electric current
=I; Then, control unit is according to the side-play amount △ of B phase load end electric current and C phase load end electric current
and △
, control respectively conducting and the deadline of the 4th IGBT and the 2nd IGBT, described bus capacitor is discharged to described B phase load end and C phase load end, until B phase load end and C phase load end electric current
,
be I; In like manner, when
be greater than I and
,
all be less than I situation and
be greater than I and
,
the situation that is all less than I all regulates conducting and the deadline of IGBT by said process, realize three-phase balance.
In the utility model embodiment, the three-phase current of described electrical network output is I, and the electric current of A, B, C threephase load end is respectively
,
,
, and
+
+
=3I; When
,
all be greater than I,
be less than I, control unit is according to the side-play amount △ of A phase load end and B phase load end electric current
, △
, controlled for the 6th and the 4th IGBT conducting and deadline, for described bus capacitor charges until A phase load end and B phase load end electric current
=I,
=I; Then, control unit is according to the side-play amount △ of C phase load end electric current
, conducting and the deadline of control the 2nd IGBT, described bus capacitor is discharged to described C phase load end, until C phase load end electric current
for I; In like manner, when
,
all be greater than I and
be less than I situation and
,
be greater than I and
the situation that is less than I all regulates conducting and the deadline of IGBT by said process, realize three-phase balance.
In the utility model embodiment, the three-phase current of described electrical network output is I, and the electric current of A, B, C threephase load end is respectively
,
,
, and
+
+
=3I; When
be greater than I,
equal I,
be less than I, control unit is according to the side-play amount △ of A phase load end electric current
, controlled for the 6th IGBT conducting and deadline, for described bus capacitor charges until A phase load end electric current
=I; Then, control unit is according to the side-play amount △ of C phase load end electric current
, conducting and the deadline of control the 2nd IGBT, described bus capacitor is discharged to described C phase load end, until C phase load end electric current
for I; In like manner, when
be greater than I,
equal I and
be less than the situation of I,
be greater than I,
=I and
be less than the situation of I,
be greater than I,
=I and
be less than the situation of I,
be greater than I,
=I and
be less than I situation and
be greater than I,
=I and
the situation that is less than I all regulates conducting and the deadline of IGBT by said process, realize three-phase balance.
Compared to prior art, the utlity model has following beneficial effect: the utility model administer three-phase imbalance towards to as if electric current and Real-time Collection, make regardless of load Distribution, electricity consumption Time Inconsistency, as long as the three-phase current detecting in real time causes imbalance because of load variations, can quick acting balanced balanced current; The system power factor that generally occurs three-phase imbalance is all lower, this device improves in power factor and has very desirable effect at compensating reactive power, can realize-1, stable regulation between 1, so not only can reactive power compensation but also can administer three-phase imbalance, compare " inductance and capacitor combination adjustment " this same not only can reactive power compensation but also can administer under three-phase imbalance method, when compensating reactive power, have more stability, not affected by line voltage, administer install when three-phase imbalance easier, deduct causing anxiety of troublesome calculation in early stage, cut-in method, immediate shipment is controlled.
Brief description of the drawings
Fig. 1 is existing a kind of mode of eliminating three-phase imbalance.
Fig. 2 is the existing another kind of mode of eliminating three-phase imbalance.
Fig. 3 is existing the third a kind of mode of eliminating three-phase imbalance.
Fig. 4 is that the utility model is implemented illustration one.
Fig. 5 is that the utility model is implemented illustration two.
Fig. 6 is that the utility model is implemented illustration three.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is specifically described.
A kind of three-phase imbalance adjusting device of the present utility model, comprises control unit, for gathering the current transformer of the A, the B that are connected with electrical network output, C threephase load end current signal, for driving IGBT control circuit, the first to the 6th IGBT, bus capacitor and first to the 3rd reactance of IGBT conduction and cut-off; The input of described control unit is connected with the output of described current transformer, and the output of described control unit is connected to the input of described IGBT control circuit, and the control end of described IGBT control circuit is connected to the gate pole of the 6th IGBT with first respectively; The collector electrode of a described IGBT is connected with the emitter of the 2nd IGBT, the collector electrode of described the 3rd IGBT is connected with the emitter of the 4th IGBT, the collector electrode of described the 5th IGBT is connected with the emitter of the 6th IGBT, the emitter of a described IGBT, the emitter of the 3rd IGBT are connected to the negative pole of described bus capacitor with the emitter of the 5th IGBT, and the collector electrode of the collector electrode of described the 2nd IGBT, the 4th IGBT is connected to the positive pole of described bus capacitor with the collector electrode of the 6th IGBT; The emitter of a described IGBT is also connected to C phase load end through the first reactance, and the emitter of described the 3rd IGBT is also connected to B phase load end through the second reactance, and the emitter of described the 5th IGBT is also connected to A phase load end through the 3rd reactance.
Be below three kinds of three-phase equilibrium principles in situation:
1. a phase current of threephase load end is greater than the phase current I of electrical network output, and biphase current is less than I:
The three-phase current of described electrical network output is I, and the electric current of A, B, C threephase load end is respectively
,
,
, and
+
+
=3I; When
be greater than I,
,
all be less than I, control unit is according to the side-play amount △ of A phase load end electric current
, controlled for the 6th IGBT conducting and deadline, for described bus capacitor charges until A phase load end electric current
=I; Then, control unit is according to the side-play amount △ of B phase load end electric current and C phase load end electric current
and △
, control respectively conducting and the deadline of the 4th IGBT and the 2nd IGBT, described bus capacitor is discharged to described B phase load end and C phase load end, until B phase load end and C phase load end electric current
,
be I; In like manner, when
be greater than I and
,
all be less than I situation and
be greater than I and
,
the situation that is all less than I all regulates conducting and the deadline of IGBT by said process, realize three-phase balance.
2. the biphase current of threephase load end is greater than I, and a phase current is less than I:
The three-phase current of described electrical network output is I, and the electric current of A, B, C threephase load end is respectively
,
,
, and
+
+
=3I; When
,
all be greater than I,
be less than I, control unit is according to the side-play amount △ of A phase load end and B phase load end electric current
, △
, controlled for the 6th and the 4th IGBT conducting and deadline, for described bus capacitor charges until A phase load end and B phase load end electric current
=I,
=I; Then, control unit is according to the side-play amount △ of C phase load end electric current
, conducting and the deadline of control the 2nd IGBT, described bus capacitor is discharged to described C phase load end, until C phase load end electric current
for I; In like manner, when
,
all be greater than I and
be less than I situation and
,
be greater than I and
the situation that is less than I all regulates conducting and the deadline of IGBT by said process, realize three-phase balance.
3. a phase current of threephase load end is greater than I, and a phase current equals I, and a phase current is less than I:
The three-phase current of described electrical network output is I, and the electric current of A, B, C threephase load end is respectively
,
,
, and
+
+
=3I; When
be greater than I,
equal I,
be less than I, control unit is according to the side-play amount △ of A phase load end electric current
, controlled for the 6th IGBT conducting and deadline, for described bus capacitor charges until A phase load end electric current
=I; Then, control unit is according to the side-play amount △ of C phase load end electric current
, conducting and the deadline of control the 2nd IGBT, described bus capacitor is discharged to described C phase load end, until C phase load end electric current
for I; In like manner, when
be greater than I,
equal I and
be less than the situation of I,
be greater than I,
=I and
be less than the situation of I,
be greater than I,
=I and
be less than the situation of I,
be greater than I,
=I and
be less than I situation and
be greater than I,
=I and
the situation that is less than I all regulates conducting and the deadline of IGBT by said process, realize three-phase balance.
Below for threephase load end three-phase current wherein a phase current be greater than I, a phase current equals I, a phase current is less than a specific embodiment of I.
As shown in Figure 4, suppose that A, B, C threephase load electric current are respectively: 5A, 10A, 15A, at this time we just think that imbalance has appearred in the three-phase current of this system, the state of three-phase current complete equipilibrium should be that A, B, C three-phase current are all 10A.
This device is in the time of operation, can be by external impressed current instrument transformer (current transformer adopting in the present embodiment is SCTK662B-45-0.66 500/5A) real-time detecting system electric current, then by A, B, the current information that C threephase current transformer (CT) collects is issued internal control unit and is processed, through control unit, (control unit in the present embodiment can adopt MCS 51 series monolithic systems, also can adopt other can realize other single-chip microcomputers of the present embodiment control unit function) analyze after, calculate the current value that three-phase current reaches the required conversion of poised state simultaneously.Taking Fig. 4 as example, A phase current wants to reach the electric current that poised state needs to increase 5A, B phase current be just in time 10A without adjustment, C phase current wants to reach the electric current that poised state needs to reduce 5A.After calculating completes, control unit will drive IGBT action by IGBT control circuit, thereby makes electric current flow into mutually this device 5A from system C, from the inner 5A that flows out of this device to system A phase.Thereby A, B, C three-phase current are all redistributed as 10A, and the three-phase total current of system remain unchanged.Certainly, this a series of calculating and control action all complete in a short period of time, and, this device just plays an effect for shunting again in this course, only needs to consume the energy (as the energy consumption of the energy consumption of fan running, control device, switching device) of a very little part.
As the size of common our said current value is current effective value, our size of previously described device shunt current is also effective value within a certain period of time.And in fact when this device compensating three-phase unbalance the action of switching device be all instantaneous.
Some instantaneous, the IGBT of C phase action, is to be stored in this after direct current to install in inner bus capacitor, as shown in Figure 5 by the AC rectification of C phase.
And instantaneous at another, the IGBT action of A phase, the direct current installing on inner bus capacitor (A, B, the public same group of bus capacitor of C) carries out inversion, is then discharged into system A to go up mutually, as shown in Figure 6.
The action of this device is instantaneous, and within certain a period of time, the effective value of its transmitting-receiving electric current is balance, therefore the result of its action can be interpreted as to shunting action, makes the effective value of system three-phase current reach a poised state.
In the time that system three-phase current all departs from balance point, the situation that compensation principle and above-described two deviates balance point is similar.Its cardinal principle stores certain mutually additional electric current in this device bus capacitor into exactly, then takes out from bus capacitor certain phase that current compensation need to compensate.
The utility model administer three-phase imbalance towards to as if electric current and Real-time Collection, make regardless of load Distribution, electricity consumption Time Inconsistency, as long as the three-phase current detecting in real time causes imbalance because of load variations, can quick acting balanced balanced current.This has just solved the objective limitation in three-phase imbalance solution.The system power factor that generally occurs three-phase imbalance is all lower, this device improves in power factor and has very desirable effect at compensating reactive power, can realize-1, stable regulation between 1, so not only can reactive power compensation but also can administer three-phase imbalance, compare " inductance and capacitor combination adjustment " this same not only can reactive power compensation but also can administer under three-phase imbalance method, when compensating reactive power, have more stability, not affected by line voltage, administer install when three-phase imbalance easier, deduct causing anxiety of troublesome calculation in early stage, cut-in method, immediate shipment is controlled.
Be more than preferred embodiment of the present utility model, all changes of doing according to technical solutions of the utility model, when the function producing does not exceed the scope of technical solutions of the utility model, all belong to protection range of the present utility model.
Claims (4)
1. a three-phase imbalance adjusting device, is characterized in that: comprise control unit, for gathering the current transformer of the A, the B that are connected with electrical network output, C threephase load end current signal, for driving IGBT control circuit, the first to the 6th IGBT, bus capacitor and first to the 3rd reactance of IGBT conduction and cut-off; The input of described control unit is connected with the output of described current transformer, and the output of described control unit is connected to the input of described IGBT control circuit, and the control end of described IGBT control circuit is connected to the gate pole of the 6th IGBT with first respectively; The collector electrode of a described IGBT is connected with the emitter of the 2nd IGBT, the collector electrode of described the 3rd IGBT is connected with the emitter of the 4th IGBT, the collector electrode of described the 5th IGBT is connected with the emitter of the 6th IGBT, the emitter of a described IGBT, the emitter of the 3rd IGBT are connected to the negative pole of described bus capacitor with the emitter of the 5th IGBT, and the collector electrode of the collector electrode of described the 2nd IGBT, the 4th IGBT is connected to the positive pole of described bus capacitor with the collector electrode of the 6th IGBT; The emitter of a described IGBT is also connected to C phase load end through the first reactance, and the emitter of described the 3rd IGBT is also connected to B phase load end through the second reactance, and the emitter of described the 5th IGBT is also connected to A phase load end through the 3rd reactance.
2. a kind of three-phase imbalance adjusting device according to claim 1, is characterized in that: the three-phase current of described electrical network output is I, and the electric current of A, B, C threephase load end is respectively
,
,
, and
+
+
=3I; When
be greater than I,
,
all be less than I, control unit is according to the side-play amount △ of A phase load end electric current
, controlled for the 6th IGBT conducting and deadline, for described bus capacitor charges until A phase load end electric current
=I; Then, control unit is according to the side-play amount △ of B phase load end electric current and C phase load end electric current
and △
, control respectively conducting and the deadline of the 4th IGBT and the 2nd IGBT, described bus capacitor is discharged to described B phase load end and C phase load end, until B phase load end and C phase load end electric current
,
be I; In like manner, when
be greater than I and
,
all be less than I situation and
be greater than I and
,
the situation that is all less than I all regulates conducting and the deadline of IGBT by said process, realize three-phase balance.
3. a kind of three-phase imbalance adjusting device according to claim 1, is characterized in that: the three-phase current of described electrical network output is I, and the electric current of A, B, C threephase load end is respectively
,
,
, and
+
+
=3I; When
,
all be greater than I,
be less than I, control unit is according to the side-play amount △ of A phase load end and B phase load end electric current
, △
, controlled for the 6th and the 4th IGBT conducting and deadline, for described bus capacitor charges until A phase load end and B phase load end electric current
=I,
=I; Then, control unit is according to the side-play amount △ of C phase load end electric current
, conducting and the deadline of control the 2nd IGBT, described bus capacitor is discharged to described C phase load end, until C phase load end electric current
for I; In like manner, when
,
all be greater than I and
be less than I situation and
,
be greater than I and
the situation that is less than I all regulates conducting and the deadline of IGBT by said process, realize three-phase balance.
4. a kind of three-phase imbalance adjusting device according to claim 1, is characterized in that: the three-phase current of described electrical network output is I, and the electric current of A, B, C threephase load end is respectively
,
,
, and
+
+
=3I; When
be greater than I,
equal I,
be less than I, control unit is according to the side-play amount △ of A phase load end electric current
, controlled for the 6th IGBT conducting and deadline, for described bus capacitor charges until A phase load end electric current
=I; Then, control unit is according to the side-play amount △ of C phase load end electric current
, conducting and the deadline of control the 2nd IGBT, described bus capacitor is discharged to described C phase load end, until C phase load end electric current
for I; In like manner, when
be greater than I,
equal I and
be less than the situation of I,
be greater than I,
=I and
be less than the situation of I,
be greater than I,
=I and
be less than the situation of I,
be greater than I,
=I and
be less than I situation and
be greater than I,
=I and
the situation that is less than I all regulates conducting and the deadline of IGBT by said process, realize three-phase balance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420443246.1U CN204012736U (en) | 2014-08-07 | 2014-08-07 | A kind of three-phase imbalance adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420443246.1U CN204012736U (en) | 2014-08-07 | 2014-08-07 | A kind of three-phase imbalance adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204012736U true CN204012736U (en) | 2014-12-10 |
Family
ID=52052678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420443246.1U Expired - Fee Related CN204012736U (en) | 2014-08-07 | 2014-08-07 | A kind of three-phase imbalance adjusting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204012736U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552939A (en) * | 2016-03-07 | 2016-05-04 | 山东电工电气集团新能科技有限公司 | Three-phase unbalance governance system and method |
| CN109103907A (en) * | 2018-09-26 | 2018-12-28 | 深圳市泰昂能源科技股份有限公司 | A kind of control method and device of three-phase imbalance compensation device |
-
2014
- 2014-08-07 CN CN201420443246.1U patent/CN204012736U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552939A (en) * | 2016-03-07 | 2016-05-04 | 山东电工电气集团新能科技有限公司 | Three-phase unbalance governance system and method |
| CN109103907A (en) * | 2018-09-26 | 2018-12-28 | 深圳市泰昂能源科技股份有限公司 | A kind of control method and device of three-phase imbalance compensation device |
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