CN107276106A - A kind of low pressure phase selection balance system and its method of work - Google Patents
A kind of low pressure phase selection balance system and its method of work Download PDFInfo
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- CN107276106A CN107276106A CN201710413155.1A CN201710413155A CN107276106A CN 107276106 A CN107276106 A CN 107276106A CN 201710413155 A CN201710413155 A CN 201710413155A CN 107276106 A CN107276106 A CN 107276106A
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Classifications
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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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- 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
- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in 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
- Y02E40/30—Reactive power compensation
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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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- 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
A kind of low pressure phase selection balance system, it is characterised in that it includes three-phase service entrance switch S1, controller T4, three-phase composite switch T3, collection bus B1, three phase rectifier module T1, single-phase full-bridge inverter module T2, single-phase outlet switch S2 and single-phase load；Its method of work includes：System starts, closure switch, and one is conducted, and single-phase load is powered；Balancing the load is adjusted；Power supply switches；Balancing the load is compensated；Its superiority is：With the response speed being exceedingly fast and single-phase load voltage jump will not be caused；Standby efficiency high, working stability, and it is simple in construction, product cost has effectively been saved, has been easy to safeguard, it is easy to operate, cost performance is higher；Active power filtering, no-power compensation function can be realized.
Description
(1) technical field：
The invention belongs to electrical equipment technical field, it is related to quality of power supply three-phase imbalance and administers direction, it is especially a kind of
Low pressure phase selection balance system and its method of work.
(2) background technology：
Three-phrase burden balance is to ensure one of essential condition of custom power quality, but in actual power system, three
Phase load imbalance is low-voltage network common phenomenon, gently the then power supplying efficiency of reduction circuit and distribution transformer, it is heavy then can be because
Heavy load mutually overloads excessive and causes the phase conductor to blow, switch and burns out or even the single-phase serious consequence such as burn of distribution transformer.
Specific influence is as follows：
1) three-phase load is seriously asymmetric, and neutral point potential will shift, and line drop and power loss will be big
Big increase；
2) electric energy loss of circuit is increased；
3) electric energy loss of distribution transformer is increased；
4) distribution transforming is exerted oneself reduction；
5) distribution transforming produces zero-sequence current；
6) safe operation of electrical equipment is influenceed.
Solving three-phase imbalance method at present mainly has two major classes, and a kind of is the three-phase imbalance based on three-phase bridge inverter
Compensation method, another is the phase selection balance method for being forced based on IGCT switching.Method based on three-phase bridge inverter is not only
It can realize that three-phase imbalance is compensated, can also realize the power quality controlling function such as active power filtering and reactive-load compensation, but due to
Program cost is higher, and requires power electronic equipment longtime running, and its reliability and maintainability is difficult to ensure that.Based on crystalline substance
Brake tube forces the method cost of switching relatively low, and reliability is high, but IGCT has voltage interruption and phase in commutation process
Position inconsistence problems, can influence the power supply reliability of user, and this method function expansibility is poor, is difficult to realize the simultaneous of product
Hold.
Therefore, the harm taken new and high technology means to reduce and avoid three-phase imbalance from bringing has become modern enterprise confession
The pressing issues of power technology.Low-cost, the phase selection balance system meaning weight of high reliability, high-performance and multifunction
Greatly.
(3) content of the invention：
The purpose of the present invention is to propose to a kind of low pressure phase selection balance system and its method of work, it can overcome prior art
Deficiency, is a kind of Power quality management system simple in construction, easy to operate, inverse by using three-phase commutation bridge and single-phase full bridge
Become device, while combination switch will be sealed between electric power system and single-phase load, can not only realize that single-phase load inputs phase voltage
Seamless switching, and single-phase load reactive-load compensation harmonic compensation function can be realized, it is real by phase voltage seamless handover function
Existing electric power system three-phase imbalance is administered, and reduces line loss by reactive-load compensation harmonic compensation function and improve circuit utilizing
Rate.
Technical scheme：A kind of low pressure phase selection balance system, including electric power system transformer and central management system
System, it is characterised in that it includes three-phase service entrance switch S1, controller T4, three-phase composite switch T3, collection bus B1, three phase rectifier
Module T1, single-phase full-bridge inverter module T2, single-phase outlet switch S2 and single-phase load；Wherein, the three-phase service entrance switch S1
Input be connected with A, B, C tri- of electric power system transformer, its A, B, C three-phase output end respectively with three-phase composite switch T3
Input and three phase rectifier module T1 exchange survey connection；Described three-phase composite switchs T3 A, B, C three-phase output end
It is connected respectively with collection bus B1 three-phase side A, B, C tri-；The single-phase load is connected to according to single-phase outlet switch S2 to be collected
Between bus B1 unidirectional survey output end and the zero line output end N of electric power system transformer；The input of the controller T4
The output end of center management system is connected, its output end switchs T3 input and single-phase full-bridge inverter module with three-phase composite
T2 input connection；The AC zero line input of the single-phase full-bridge inverter module T2 is inputted with single-phase outlet switch S2
Connection, its AC live wire input is then connected with collection bus B1；The DC side of the three phase rectifier module T1 with it is single-phase complete
Bridge inverter module T2 DC side connection；The AC zero line of the single-phase full-bridge inverter module T2 and three-phase service entrance switch
S1 zero line output end N connections.
The input of the controller T4 receives the communication signal C1 of center management system, its output end output control signal
The input that K1 switchs T3 with three-phase composite is connected, while output control signal K2 and single-phase full-bridge inverter module T2 input
End connection.
The three-phase composite switch T3 is composed in parallel by three bidirectional thyristors with three contactors；Three two-way crystalline substances
Brake tube is serially connected between three-phase service entrance switch S1 output end and collection bus B1 respectively, is in be connected in parallel between three；It is described
Three contactors are connected in parallel on three bidirectional thyristor two ends respectively.
The three phase rectifier module T1 is conventional rectification circuit topological structure.
The single-phase full-bridge inverter module T2 is single-phase full-bridge inverter and LCL filter built-up circuit topological structure,
Its connection is conventional connection.
A kind of method of work of low pressure phase selection balance system, it is characterised in that it comprises the following steps：
1. the A phase, B phase, C phase in electric power system connects respective single-phase load respectively, and single-phase load L1 passes through low pressure
Phase selection balance system is connected with electric power system, after system startup work, closes three-phase service entrance switch S1 and single-phase outlet switch S2,
Wherein one in three-phase composite switch T3 any moment only A, B, C three-phase is conducted, i.e., real by the closure of the phase contact
Now turn on, be that single-phase load L1 powers, now, single-phase full-bridge inverter module T2 is operated in the electricity of reactive-load compensation harmonic compensation
Flow under source module；
2. when center management system by detect three-phase each power analyze in real time three phase power whether disequilibrium, if this
When electric power system in A phases power supply institute on-load L1 and L3 capacity it is overweight, and B phases power supply institute on-load L4 capacity is lighter, then in
Centre management system will send order by the load L1 of the system institute band to low pressure phase selection balance system and be switched to B phases by A phase power supplys
Power supply, so just realizes the load L1 of A phases power supply institute band being transferred to and is powered by B phase power supplys, is born so as to alleviate A phases power supply
Lotus capacity, has aggravated B phase power supply load capacities, has finally realized the balancing the load of three-phase；
3. handoff procedure comprises the following steps, disconnects the A phase contacts in three-phase composite switch T3, simultaneously turns on three-phase and answer
A phase bidirectional thyristors in combination switch T3, to ensure that electric current is not interrupted, IGCT is then stopped after the conducting of A phases bidirectional thyristor
Triggering, therefore, can then be turned it off after the current zero-crossing point of A phase bidirectional thyristors, turn off the moment by single-phase full-bridge inverter
Module T2, which is switched to voltage source mode of operation by current source mode of operation and continues as A phase loads, to power, and its energy of powering comes from
Three phase rectifier module REC；
4. single-phase full-bridge inverter module T2 adjusts the phase of the alternating voltage of its output, and initial phase is adjusted from A phases
To consistent with B, stop single-phase full-bridge inverter module T2 work, and the B phases in triggering three-phase composite switch T3 simultaneously this moment
Bidirectional thyristor, it is ensured that load current is not interrupted；
5. the B phase contacts in closure three-phase composite switch T3, while stopping triggering B phase bidirectional thyristors, are finally completed
The process that single-phase load is powered by original A phases power switching to B phases, it is achieved thereby that the compensation of three-phrase burden balance.
The superiority of the present invention：1st, coordinate handoff technique present invention uses combination switch and single-phase inverter, not only have
There is the response speed being exceedingly fast and single-phase load voltage jump will not be caused；2nd, combination switch it is applicable cause standby efficiency high,
Working stability, and it is simple in construction, product cost has effectively been saved, has been easy to safeguard, it is easy to operate, cost performance is higher；3rd, may be used
To realize active power filtering, no-power compensation function.
(4) illustrate：
Fig. 1 is a kind of involved overall structure diagram of low pressure phase selection balance system of the present invention.
Three phase rectifier module REC circuit theory schematic diagram in a kind of Fig. 2 low pressure phase selection balance systems involved by the present invention.
Fig. 3 illustrates for the circuit theory of single-phase inverter module I NV in a kind of involved low pressure phase selection balance system of the present invention
Figure.
(5) embodiment：
Embodiment：A kind of low pressure phase selection balance system (see Fig. 1), including electric power system transformer and center management system,
It is characterized in that it includes three-phase service entrance switch S1, controller T4, three-phase composite switch T3, collection bus B1, three phase rectifier mould
Block T1, single-phase full-bridge inverter module T2, single-phase outlet switch S2 and single-phase load；Wherein, the three-phase service entrance switch S1
Input is connected with A, B, C tri- of electric power system transformer, and its A, B, C three-phase output end switchs T3's with three-phase composite respectively
Connection is surveyed in input and three phase rectifier module T1 exchange；Described three-phase composite switch T3 A, B, C three-phase output end point
It is not connected with collection bus B1 three-phase side A, B, C tri-；The single-phase load is connected to according to single-phase outlet switch S2 collects mother
Between line B1 unidirectional survey output end and the zero line output end N of electric power system transformer；The input of the controller T4 connects
The output end of center management system is connect, its output end switchs T3 input and single-phase full-bridge inverter module T2 with three-phase composite
Input connection；The AC zero line input of the single-phase full-bridge inverter module T2 is inputted with single-phase outlet switch S2 to be connected
Connect, its AC live wire input is then connected with collection bus B1；The DC side and single-phase full bridge of the three phase rectifier module T1
Inverter module T2 DC side connection；The AC zero line of the single-phase full-bridge inverter module T2 and three-phase service entrance switch S1
The N connections of zero line output end.
The input of the controller T4 receives the communication signal C1 of center management system, its output end output control signal
The input that K1 switchs T3 with three-phase composite is connected, while output control signal K2 and single-phase full-bridge inverter module T2 input
End connection is (see Fig. 1).
The three-phase composite switch T3 (see Fig. 1) is composed in parallel by three bidirectional thyristors with three contactors；Described three
Individual bidirectional thyristor is serially connected between three-phase service entrance switch S1 output end and collection bus B1 respectively, is connected between three in parallel
Connect；Three contactors are connected in parallel on three bidirectional thyristor two ends respectively.
The three phase rectifier module T1 is conventional rectification circuit topological structure (see Fig. 2).
The single-phase full-bridge inverter module T2 is single-phase full-bridge inverter and LCL filter built-up circuit topological structure,
It is conventional connect (see Fig. 3) that it, which is connected,.
A kind of method of work of low pressure phase selection balance system, it is characterised in that it comprises the following steps：
1. the A phase, B phase, C phase in electric power system connects respective single-phase load respectively, and single-phase load L1 passes through low pressure
Phase selection balance system is connected with electric power system, after system startup work, closes three-phase service entrance switch S1 and single-phase outlet switch S2,
Wherein one in three-phase composite switch T3 any moment only A, B, C three-phase is conducted, i.e., real by the closure of the phase contact
Now turn on, such as B phases, load L1 can be now switched to electric power system B phases, be that single-phase load L1 powers, now, single-phase full bridge
Inverter module T2 is operated under the current source mode of reactive-load compensation harmonic compensation；
2. when center management system by detect three-phase each power analyze in real time three phase power whether disequilibrium, if this
When electric power system in A phases power supply institute on-load L1 and L3 capacity it is overweight, and B phases power supply institute on-load L4 capacity is lighter, then in
Centre management system will send order by the load L1 of the system institute band to low pressure phase selection balance system and be switched to B phases by A phase power supplys
Power supply, so just realizes the load L1 of A phases power supply institute band being transferred to and is powered by B phase power supplys, is born so as to alleviate A phases power supply
Lotus capacity, has aggravated B phase power supply load capacities, has finally realized the balancing the load of three-phase；
3. handoff procedure comprises the following steps, disconnects the A phase contacts in three-phase composite switch T3, simultaneously turns on three-phase and answer
A phase bidirectional thyristors in combination switch T3, to ensure that electric current is not interrupted, IGCT is then stopped after the conducting of A phases bidirectional thyristor
Triggering, therefore, can then be turned it off after the current zero-crossing point of A phase bidirectional thyristors, turn off the moment by single-phase full-bridge inverter
Module T2, which is switched to voltage source mode of operation by current source mode of operation and continues as A phase loads, to power, and its energy of powering comes from
Three phase rectifier module REC；
4. single-phase full-bridge inverter module T2 adjusts the phase of the alternating voltage of its output, and initial phase is adjusted from A phases
To consistent with B, stop single-phase full-bridge inverter module T2 work, and the B phases in triggering three-phase composite switch T3 simultaneously this moment
Bidirectional thyristor, it is ensured that load current is not interrupted；
5. the B phase contacts in closure three-phase composite switch T3, while stopping triggering B phase bidirectional thyristors, are finally completed
The process that single-phase load is powered by original A phases power switching to B phases, it is achieved thereby that the compensation of three-phrase burden balance.
Claims (4)
1. a kind of low pressure phase selection balance system, including electric power system transformer and center management system, it is characterised in that it includes
Three-phase service entrance switch S1, controller T4, three-phase composite switch T3, collection bus B1, three phase rectifier module T1, single-phase full bridge inversion
Device module T2, single-phase outlet switch S2 and single-phase load；Wherein, the input of the three-phase service entrance switch S1 becomes with electric power system
A, B, C tri- of depressor is connected, and its A, B, C three-phase output end switchs T3 input and three phase rectifier with three-phase composite respectively
Connection is surveyed in module T1 exchange；Described three-phase composite switch T3 A, B, C three-phase output end respectively with collection bus B1 three
Phase side A, B, C tri- is connected；The single-phase load is exported according to the single-phase outlet switch S2 unidirectional surveys for being connected to collection bus B1
Between end and the zero line output end N of electric power system transformer；The input of the controller T4 connects the defeated of center management system
Go out end, the input of input and single-phase full-bridge inverter module T2 that its output end switchs T3 with three-phase composite is connected；It is described
Single-phase full-bridge inverter module T2 AC zero line input is connected with single-phase outlet switch S2 inputs, and its AC live wire is defeated
Enter end to be then connected with collection bus B1；The DC side of the three phase rectifier module T1 and single-phase full-bridge inverter module T2 direct current
Side is connected；The AC zero line of the single-phase full-bridge inverter module T2 is connected with three-phase service entrance switch S1 zero line output end N.
2. a kind of low pressure phase selection balance system according to claim 1, it is characterised in that the input termination of the controller T4
The communication signal C1 of center management system is received, the input that its output end output control signal K1 switchs T3 with three-phase composite connects
Connect, while output control signal K2 is connected with single-phase full-bridge inverter module T2 input.
3. a kind of low pressure phase selection balance system according to claim 1, it is characterised in that the three-phase composite switchs T3 by three
Individual bidirectional thyristor is composed in parallel with three contactors；Three bidirectional thyristors are serially connected in three-phase service entrance switch S1's respectively
It is in be connected in parallel between output end and collection bus B1, between three；Three contactors are connected in parallel on three two-way crystalline substances respectively
Brake tube two ends.
4. a kind of method of work of low pressure phase selection balance system, it is characterised in that it comprises the following steps：
1. the A phase, B phase, C phase in electric power system connects respective single-phase load respectively, and single-phase load L1 passes through low pressure phase selection
Balance system is connected with electric power system, after system startup work, closes three-phase service entrance switch S1 and single-phase outlet switch S2, three-phase
Wherein one in combination switch T3 any moment only A, B, C three-phase is conducted, i.e., realized and led by the closure of the phase contact
It is logical, it is that single-phase load L1 powers, now, single-phase full-bridge inverter module T2 is operated in the current source of reactive-load compensation harmonic compensation
Under pattern；
2. when center management system by detect three-phase each power analyze in real time three phase power whether disequilibrium, if now supplying
A phases power supply institute on-load L1 and L3 capacity in electric system is overweight, and B phases power supply institute on-load L4 capacity is lighter, then mesotube
Reason system will send order by the load L1 of the system institute band to low pressure phase selection balance system and be switched to B phase power supplys by A phase power supplys,
So just realize the load L1 of A phases power supply institute band being transferred to and powered by B phase power supplys, so as to alleviate A phase power supplys load appearance
Amount, has aggravated B phase power supply load capacities, has finally realized the balancing the load of three-phase；
3. handoff procedure comprises the following steps, disconnects the A phase contacts in three-phase composite switch T3, simultaneously turns on three-phase composite and open
The A phase bidirectional thyristors in T3 are closed, to ensure that electric current is not interrupted, then stop the triggering of IGCT after the conducting of A phases bidirectional thyristor,
Therefore, it can then be turned it off after the current zero-crossing point of A phase bidirectional thyristors, turn off the moment by single-phase full-bridge inverter module T2
Voltage source mode of operation is switched to by current source mode of operation continues as A phase loads and power, it is whole that its energy of powering comes from three-phase
Flow module REC；
4. single-phase full-bridge inverter module T2 adjusts the phase of the alternating voltage of its output, and initial phase is adjusted to and B from A phases
It is consistent, stop single-phase full-bridge inverter module T2 work, and the two-way crystalline substance of B phases in triggering three-phase composite switch T3 simultaneously this moment
Brake tube, it is ensured that load current is not interrupted；
5. the B phase contacts in closure three-phase composite switch T3, while stopping triggering B phase bidirectional thyristors, are finally completed single-phase
The process that load is powered by original A phases power switching to B phases, it is achieved thereby that the compensation of three-phrase burden balance.
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| CN107677912A (en) * | 2017-11-09 | 2018-02-09 | 云南电网有限责任公司临沧供电局 | A kind of detection device and detection method of low pressure automatic phase selecting load equalizer |
| CN109842134A (en) * | 2019-01-18 | 2019-06-04 | 国网湖南省电力有限公司 | A kind of commutation device, system and method |
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| CN109842134A (en) * | 2019-01-18 | 2019-06-04 | 国网湖南省电力有限公司 | A kind of commutation device, system and method |
| CN109842134B (en) * | 2019-01-18 | 2024-01-26 | 国网湖南省电力有限公司 | Commutation device, system and method |
| CN110336473A (en) * | 2019-07-11 | 2019-10-15 | 珠海万力达电气自动化有限公司 | A kind of railway Special low-voltage power supply and half-closed loop control method |
| CN110336473B (en) * | 2019-07-11 | 2021-05-18 | 珠海万力达电气自动化有限公司 | Low-voltage power supply special for railway and semi-closed loop control method |
| CN110323766A (en) * | 2019-07-19 | 2019-10-11 | 云南电网有限责任公司电力科学研究院 | A kind of low-voltage network imbalance of three-phase voltage governing system and method |
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