CN109586323A - A kind of zero passage phase change method - Google Patents
A kind of zero passage phase change method Download PDFInfo
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- CN109586323A CN109586323A CN201910068435.2A CN201910068435A CN109586323A CN 109586323 A CN109586323 A CN 109586323A CN 201910068435 A CN201910068435 A CN 201910068435A CN 109586323 A CN109586323 A CN 109586323A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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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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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a kind of zero passage phase change methods, and the current over-zero moment T for cutting off former phase sequence is calculated including controlleri1, controller is in Ti1Moment is closed reverse-blocking tetrode thyristor, and controller calculates Ti1Next current over-zero moment T afterwardsi2, controller is in Ti2Before, T in advance1When separated third relay, controller calculates Ti2Next current over-zero moment T afterwardsi3, the controller is in the Ti3Moment disconnects reverse-blocking tetrode thyristor, disconnects external load, and controller calculates Ti3Next time puts into the voltage zero-cross moment T of new phase sequence afterwardsU1, first pair is cut relay in Ti3Moment and TU1Investment operation is carried out between moment, in TU1Moment is closed reverse-blocking tetrode thyristor, and controller calculates TU1Next voltage zero-cross moment T afterwardsU2, T in advance1Time is closed third relay, and controller calculates TU2Next voltage zero-cross moment T afterwardsU3, controller is in TU3Moment disconnects reverse-blocking tetrode thyristor, puts into external load.This method can make the external current zero-crossing point that is supported on cut off and put into voltage over zero, and the power-off time in commutation process is short.
Description
Technical field
The invention belongs to power distribution station commutation design field more particularly to a kind of zero passage phase change methods.
Background technique
At present the case where the generally existing three-phase imbalance in distribute-electricity transformer district, and as more and more single-phase customer charges are unordered
Distribute-electricity transformer district is accessed, the three-phase imbalance situation in platform area is got worse.Three-phase imbalance will lead to power quality decline, transformer
The problems such as loss increase, distribution transforming power output with route are reduced, influences the Electrical Safety of field electrical equipment.In response to country's section
It can call, realize that the commutation of load adjusts using phase-change switch, fundamentally realize the three-phase coulomb balance of distribute-electricity transformer district, be to work as
The main trend that preceding distribute-electricity transformer district three-phase imbalance is administered.
Due to needing to realize that commutation is adjusted from load end, commutation process relates to electrical equipment cutting between different phases
It changes, i.e., is cut off from original phase, and put into newly separate.The commutation overlong time of current commutation operation, can allow electricity consumption to set
It is standby to power off for a long time, or even accident occurs.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of zero passage phase change method, this method can make external be supported on
Current zero-crossing point cuts off and puts into voltage over zero, and the power-off time in commutation process is short.
To solve the above problems, the technical solution of the present invention is as follows:
A kind of zero passage phase change method, includes the following steps:
S1: controller receives the phase sequence switching command that external device (ED) is sent, and carries out commutation preparation；
S2: the controller calculates the electricity for cutting off former phase sequence next time according to current effective value I and current flow instantaneous value i
Flow through zero moment Ti1, the controller is in the Ti1Moment is closed reverse-blocking tetrode thyristor；
S3: the controller continues to calculate the Ti1The current over-zero moment T of next former phase sequence after momenti2, root
According to the preset time delay of action T of third relay1, the controller is in the Ti2Moment, in advance T1When the separated third after
Electric appliance；
S4: the controller continues to calculate the Ti2The current over-zero moment T of next former phase sequence after momenti3, institute
Controller is stated in the Ti3Moment disconnects reverse-blocking tetrode thyristor, disconnects external load；
S5: the controller is according to the voltage effective value U and Ti3The instantaneous voltage u at moment calculates investment next time newly
The voltage zero-cross moment T of phase sequenceU1；
S6: the preset time delay of action T of relay is cut according to the first of investment pair2, the controller is in the Ti3Moment mentions
Preceding T2Time puts into described first pair and cuts relay, to guarantee that described first pair is cut relay in the Ti3Moment and the TU1When
Investment operation is carried out between quarter；
S7: the controller is in the TU1Moment is closed the reverse-blocking tetrode thyristor；
S8: the controller continues to calculate the TU1The voltage zero-cross moment T of next new phase sequence after momentU2, mention
Preceding T1Time is closed the third relay；
S9: the controller continues to calculate the TU2The voltage zero-cross moment T of next new phase sequence after momentU3, institute
Controller is stated in the TU3Moment disconnects the reverse-blocking tetrode thyristor, puts into the external load.
The zero passage phase change method that one embodiment of the invention provides, the reverse-blocking tetrode thyristor is to detect crossover point signal simultaneously
In zero crossing execution.
The present invention due to using the technology described above, makes it have the following advantages that and actively imitate compared with prior art
Fruit:
1) controller in the zero passage phase change method that one embodiment of the invention provides receives the phase sequence that external device (ED) is sent
Switching command, carries out commutation preparation, and controller calculates excision next time original according to current effective value I and current flow instantaneous value i
The current over-zero moment T of phase sequencei1, controller is in Ti1Moment is closed reverse-blocking tetrode thyristor, and controller continues to calculate Ti1It is next after moment
The current over-zero moment T of a original phase sequencei2, according to the preset time delay of action T of third relay1, controller is in Ti2Moment, in advance T1
When separated third relay, then controller continues to calculate Ti2The current over-zero moment T of next original phase sequence after momenti3, control
Device processed is in Ti3Moment disconnects reverse-blocking tetrode thyristor, disconnects external load, controller is according to voltage effective value U and Ti3Moment
Instantaneous voltage u calculates the voltage zero-cross moment T for putting into new phase sequence next timeU1, it is preset that relay is cut according to the first of investment pair
Time delay of action T2, controller is in Ti3Moment, in advance T2Time puts into first pair and cuts relay, to guarantee that cutting relay for first pair exists
Ti3Moment and TU1Investment operation is carried out between moment, controller is in TU1Moment is closed reverse-blocking tetrode thyristor, and controller continues to calculate TU1
The voltage zero-cross moment T of next new phase sequence after momentU2, T in advance1Time is closed third relay, and controller continues to calculate TU2
The voltage zero-cross moment T of next new phase sequence after momentU3, controller is in TU3Moment disconnects reverse-blocking tetrode thyristor, puts into external bear
It carries.This method can make the external current zero-crossing point that is supported on cut off and put into voltage over zero, disconnected in commutation process
The electric time is short.
2) one embodiment of the invention provide zero passage phase change method in reverse-blocking tetrode thyristor due to actuation time it is short, controllably
The circuit of transwitch control is able to detect zero cross signal, guarantees that commutation operation is carried out in current zero-crossing point and voltage over zero.
Detailed description of the invention
Fig. 1 is the system flow chart of zero passage phase change method of the invention；
Fig. 2 is the hardware structure diagram of the zero passage phase change method of one embodiment of the invention；
Fig. 3 is the timing diagram that the commutation of one embodiment of the invention operates.
Description of symbols:
1: the first pair is cut relay；2: the second pairs are cut relay；3:: third relay；4: reverse-blocking tetrode thyristor；5:C phase electricity
Press mutual inductor；6:A phase voltage mutual inductor；7:B phase voltage mutual inductor；8: current transformer.
Specific embodiment
A kind of zero passage phase change method proposed by the present invention is made further specifically below in conjunction with the drawings and specific embodiments
It is bright.According to following explanation and claims, advantages and features of the invention will be become apparent from.
Referring to Fig. 1, a kind of zero passage phase change method includes the following steps:
S1: controller receives the phase sequence switching command that external device (ED) is sent, and carries out commutation preparation；
S2: controller calculates the electric current mistake for cutting off former phase sequence next time according to current effective value I and current flow instantaneous value i
Zero moment Ti1, controller is in Ti1Moment is closed reverse-blocking tetrode thyristor 4；
S3: controller continues to calculate Ti1The current over-zero moment T of next original phase sequence after momenti2, according to third relay
3 preset time delay of action T1, controller is in Ti2Moment, in advance T1When separated third relay 3；
S4: controller continues to calculate Ti2The current over-zero moment T of next original phase sequence after momenti3, controller is in Ti3Moment
Reverse-blocking tetrode thyristor 4 is disconnected, external load is disconnected；
S5: controller is according to voltage effective value U and Ti3The instantaneous voltage u at moment calculates the electricity for putting into new phase sequence next time
Press through zero moment TU1；
S6: the preset time delay of action T of relay 1 is cut for first pair according to investment2, controller is in Ti3Moment, in advance T2Time
Investment first pair cuts relay 1, cuts relay 1 in T to guarantee first pairi3Moment and TU1Investment operation is carried out between moment；
S7: controller is in TU1Moment is closed reverse-blocking tetrode thyristor 4；
S8: controller continues to calculate TU1The voltage zero-cross moment T of next new phase sequence after momentU2, T in advance1Time closure
Third relay 3；
S9: controller continues to calculate TU2The voltage zero-cross moment T of next new phase sequence after momentU3, controller is in TU3Moment
Reverse-blocking tetrode thyristor 4 is disconnected, external load is put into.
It is cut it is appreciated that the controller in zero passage phase change method provided in this embodiment receives the phase sequence that external device (ED) is sent
Order is changed, commutation preparation is carried out, controller calculates according to current effective value I and current flow instantaneous value i and cuts off former phase next time
The current over-zero moment T of sequencei1, controller is in Ti1Moment is closed reverse-blocking tetrode thyristor 4, and controller continues to calculate Ti1It is next after moment
The current over-zero moment T of a original phase sequencei2, according to the preset time delay of action T of third relay 31, controller is in Ti2Moment, in advance
T1When separated third relay 3, then controller continues to calculate Ti2The current over-zero moment T of next original phase sequence after momenti3,
Controller is in Ti3Moment disconnects reverse-blocking tetrode thyristor 4, disconnects external load, controller is according to voltage effective value U and Ti3Moment
Instantaneous voltage u calculate the voltage zero-cross moment T for putting into new phase sequence next timeU1, it is default that relay 1 is cut according to the first of investment pair
Time delay of action T2, controller is in Ti3Moment, in advance T2Time puts into first pair and cuts relay 1, cuts relay to guarantee first pair
Device 1 is in Ti3Moment and TU1Investment operation is carried out between moment, controller is in TU1Moment is closed reverse-blocking tetrode thyristor 4, and controller continues
Calculate TU1The voltage zero-cross moment T of next new phase sequence after momentU2, T in advance1Time is closed third relay 3, and controller continues
Calculate TU2The voltage zero-cross moment T of next new phase sequence after momentU3, controller is in TU3Moment disconnects reverse-blocking tetrode thyristor 4, investment
External load.This method can make the external current zero-crossing point that is supported on cut off and put into voltage over zero, commutation
Power-off time in journey is short.
Since the actuation time of reverse-blocking tetrode thyristor is short, can be acted at current over-zero moment and voltage zero-cross moment,
Crossover point signal is detected, guarantees that commutation is carried out in zero passage point moment.
Further, it with continued reference to Fig. 2 and Fig. 3, when three-phase imbalance occurs in distribute-electricity transformer district, needs to load from original
Phase sequence switches to new phase sequence to reach three-phase equilibrium.Assuming that C phase need to be shifted to from A phase for load, controller acquires current transformer 9
Current current instantaneous value i simultaneously calculates the current over-zero moment T for removing A phase according to current effective value Ii1, due to reverse-blocking tetrode thyristor 4
Actuation time is short, can guarantee that commutation is carried out in zero crossing, controller is in Ti1Moment is closed reverse-blocking tetrode thyristor 4, and controller continues
Calculate Ti1The current over-zero moment T of next A phase after momenti2, since there are action delays for relay itself, to guarantee third
Relay 3 is carried out in current over-zero point moment, need to be according to the preset time delay of action T of third relay 31, controller is in Ti2Moment,
T in advance1When separated third relay 3, then controller continues to calculate Ti2The current over-zero moment of next A phase after moment
Ti3, controller is in Ti3Moment disconnects reverse-blocking tetrode thyristor 4, to disconnect external load, controller acquires Ti3The C phase electricity at moment
It presses the instantaneous voltage u of mutual inductor 5 and calculates the voltage zero-cross moment T of investment C phase next time according to voltage effective value UU1, also need root
The preset time delay of action T of relay 1 is cut according to first pair of investment2, controller is in Ti3Moment, in advance T2Time puts into first pair and cuts
Relay 1 guarantees first pair and cuts relay 1 in Ti3Moment and TU1Investment operation is carried out between moment, then controller is in TU1When
Closure reverse-blocking tetrode thyristor 4 is carved, controller continues to calculate TU1The voltage zero-cross moment T of next C phase after momentU2, T in advance1Time
It is closed third relay 3, controller continues to calculate TU2The voltage zero-cross moment T of next C phase after momentU3, controller is in TU3When
It carves and disconnects reverse-blocking tetrode thyristor 4, put into external load, thus complete entire commutation process.In addition, commutation system (is not marked in figure
Second pair is further comprised out) cuts relay 2, A phase voltage mutual inductor 6 and B phase voltage mutual inductor 7.
It is appreciated that first pair is cut relay and second pair is cut relay and can be avoided phase fault in commutation.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode.Even if to the present invention, various changes can be made, if these variations belong to the model of the claims in the present invention and its equivalent technologies
Within enclosing, then still fall within the protection scope of the present invention.
Claims (2)
1. a kind of zero passage phase change method, which comprises the steps of:
S1: controller receives the phase sequence switching command that external device (ED) is sent, and carries out commutation preparation；
S2: the controller calculates the electric current mistake for cutting off former phase sequence next time according to current effective value I and current flow instantaneous value i
Zero moment Ti1, the controller is in the Ti1Moment is closed reverse-blocking tetrode thyristor；
S3: the controller continues to calculate the Ti1The current over-zero moment T of next former phase sequence after momenti2, according to
The preset time delay of action T of three relays1, the controller is in the Ti2Moment, in advance T1When the separated third relay；
S4: the controller continues to calculate the Ti2The current over-zero moment T of next former phase sequence after momenti3, the control
Device processed is in the Ti3Moment disconnects the reverse-blocking tetrode thyristor, disconnects external load；
S5: the controller is according to the voltage effective value U and Ti3The instantaneous voltage u at moment, which is calculated, puts into new phase sequence next time
Voltage zero-cross moment TU1；
S6: the preset time delay of action T of relay is cut according to the first of investment pair2, the controller is in the Ti3Moment, in advance T2
Time puts into described first pair and cuts relay, to guarantee that described first pair is cut relay in the Ti3Moment and the TU1Moment
Between carry out investment operation；
S7: the controller is in the TU1Moment is closed the reverse-blocking tetrode thyristor；
S8: the controller continues to calculate the TU1The voltage zero-cross moment T of next new phase sequence after momentU2, T in advance1
Time is closed the third relay；
S9: the controller continues to calculate the TU2The voltage zero-cross moment T of next new phase sequence after momentU3, the control
Device processed is in the TU3Moment disconnects the reverse-blocking tetrode thyristor, puts into the external load.
2. zero passage phase change method as described in claim 1, which is characterized in that the reverse-blocking tetrode thyristor is to detect zero crossing letter
Number and in zero crossing execution.
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| CN201910068435.2A CN109586323A (en) | 2019-01-24 | 2019-01-24 | A kind of zero passage phase change method |
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| CN201910068435.2A CN109586323A (en) | 2019-01-24 | 2019-01-24 | A kind of zero passage phase change method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266025A (en) * | 2019-07-03 | 2019-09-20 | 青岛鼎信通讯股份有限公司 | A kind of three-phase intelligent phase-change switch device and control method optimizing switch topology |
| CN114076844A (en) * | 2020-08-21 | 2022-02-22 | 深圳绿米联创科技有限公司 | Zero-crossing control method, electronic device, and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207283168U (en) * | 2017-09-29 | 2018-04-27 | 夏季真 | A kind of electric load commutation circuit for electrical zero interruption |
| CN108306315A (en) * | 2018-01-19 | 2018-07-20 | 中南大学 | A kind of low-voltage network phase change method and commutation equipment and terminal |
| CN108933444A (en) * | 2017-05-22 | 2018-12-04 | 菏泽峥艳电力科技有限公司 | Intelligent phase-change switch control circuit |
-
2019
- 2019-01-24 CN CN201910068435.2A patent/CN109586323A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108933444A (en) * | 2017-05-22 | 2018-12-04 | 菏泽峥艳电力科技有限公司 | Intelligent phase-change switch control circuit |
| CN207283168U (en) * | 2017-09-29 | 2018-04-27 | 夏季真 | A kind of electric load commutation circuit for electrical zero interruption |
| CN108306315A (en) * | 2018-01-19 | 2018-07-20 | 中南大学 | A kind of low-voltage network phase change method and commutation equipment and terminal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266025A (en) * | 2019-07-03 | 2019-09-20 | 青岛鼎信通讯股份有限公司 | A kind of three-phase intelligent phase-change switch device and control method optimizing switch topology |
| CN114076844A (en) * | 2020-08-21 | 2022-02-22 | 深圳绿米联创科技有限公司 | Zero-crossing control method, electronic device, and storage medium |
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Application publication date: 20190405 |