CN208158131U - Three-phase imbalance commutation device - Google Patents

Three-phase imbalance commutation device Download PDF

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Publication number
CN208158131U
CN208158131U CN201820687812.1U CN201820687812U CN208158131U CN 208158131 U CN208158131 U CN 208158131U CN 201820687812 U CN201820687812 U CN 201820687812U CN 208158131 U CN208158131 U CN 208158131U
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China
Prior art keywords
phase
commutation
unit
resistance
disconnecting link
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CN201820687812.1U
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梁万龙
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Guangdong Power Grid Co Ltd
Dongguan Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Dongguan Power Supply Bureau of Guangdong Power Grid Co Ltd
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Priority to CN201820687812.1U priority Critical patent/CN208158131U/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50Arrangements for eliminating or reducing asymmetry in polyphase networks

Abstract

The utility model discloses a kind of three-phase imbalance commutation devices, including:Current acquisition unit, main control unit, voltage zero-cross detection unit, driving unit, thyristor cell and switch unit;Current acquisition unit and voltage zero-cross detection unit are all connected with each phase and main control unit of three-phase;Thyristor cell is connected to each phase of three-phase and single-phase load, control terminal connect driving unit;Switch unit is connected to each phase and single-phase load of three-phase, wherein switch unit includes commutation disconnecting link and electric machine, and electric machine connects commutation disconnecting link, and the static contact of commutation disconnecting link is separately connected each phase of three-phase, and moving contact connects single-phase load.The utility model may be implemented the monitoring of three-phase imbalance and carry out not power down commutation by the components such as thyristor and commutation disconnecting link, also be switched using voltage over zero greatly to reduce electric arc to improve the safety and service life of commutation device.

Description

Three-phase imbalance commutation device
Technical field
The utility model relates to three-phase distribution technical field more particularly to a kind of three-phase imbalance commutation devices.
Background technique
In Distribution network system, there are a large amount of single-phase, asymmetric, non-linear, impact loads, due to early stage Electrical reticulation design is planned inconsiderate, it may appear that the case where a large amount of single-phase loads concentrate on single-phase or two-phase, these unbalanced load meetings So that distribution system is generated three-phase imbalance, leads to the imbalance of power supply system three-phase voltage, electric current.
Three-phase load unbalance will increase grid loss, seriously affect power supply quality, it is common practice that pass through manual switching The power supply of single-phase load mutually adjusts three-phase equilibrium, but this mode needs first to operate load power failure again, this serious shadow The power supply reliability to user has been rung, challenge is proposed to the quality supply of power grid.Therefore, Distribution network and rural power grids Three-phase imbalance problem has become urgent problem to be solved in current power distribution systems.
Utility model content
In view of the above problems, the utility model proposes a kind of three-phase imbalance commutation device, for using commutation disconnecting link and Thyristor carries out gapless commutation, to solve the problems, such as to complete switching route in the case where single-phase load not power down.
The utility model proposes a kind of three-phase imbalance commutation device, including:Current acquisition unit, main control unit, electricity Press through zero detection unit, driving unit, thyristor cell and switch unit;
The current acquisition unit and the voltage zero-cross detection unit be all connected with three-phase it is each mutually and the main control unit;
The main control unit connects the driving unit;
The thyristor cell is connected to each phase and single-phase load of the three-phase, and it is single that control terminal connects the driving Member, wherein the thyristor cell includes 3 thyristors, each mutually company of one-to-one correspondence of each thyristor and the three-phase It connects;
The switch unit is connected to each phase and single-phase load of the three-phase, wherein the switch unit includes commutation Disconnecting link and electric machine, the electric machine connect the driving unit and the commutation disconnecting link, the stationary contact of the commutation disconnecting link Head is separately connected each phase of the three-phase, and moving contact connects the single-phase load.
Optionally, the voltage zero-cross detection unit includes 3 single-phase zero cross detection circuits, each single-phase zero passage inspection Slowdown monitoring circuit is used to detect its voltage over zero for corresponding to phase line.
Optionally, the single-phase zero cross detection circuit includes:First resistor, second resistance, 3rd resistor, the 4th resistance, 5th resistance and difference amplifier;
It is detected and mutually passes through the non-inverting input terminal that the first resistor connects the difference amplifier, the one of the 5th resistance End connects the non-inverting input terminal, other end ground connection;A phase in remaining two-phase connects the difference by the second resistance One end of the inverting input terminal of amplifier, the 4th resistance connects the second resistance and the inverting input terminal, another termination Ground;A remaining phase connects the second resistance and the 4th resistance by the 3rd resistor, the difference amplifier it is defeated Outlet exports the voltage over zero signal of the detected phase.
Optionally, the three-phase imbalance commutation device of the utility model further includes:Timing trigger unit, the clocked flip Unit is connect with the current acquisition unit, and the current acquisition unit is triggered for regularly sending current acquisition signal and is carried out Acquisition.
Optionally, the three-phase imbalance commutation device of the utility model further includes:Protection location, the protection location and institute It states switch unit to connect with the single-phase load, for protecting the single-phase load when short circuit or overcurrent occur for route Shield.
Optionally, the current acquisition unit includes:Current transformer, amplification treatment circuit and analog to digital conversion circuit, institute It states current transformer, the amplification treatment circuit and analog-digital conversion circuit as described to be sequentially connected, for acquiring the real-time electricity of three-phase Stream.
Optionally, the amplification treatment circuit includes:Signal amplifier, low-pass filter and inverting integrator, the letter Number amplifier, the low-pass filter and the inverting integrator are sequentially connected, corresponding for carrying out to collected signal Conditioning.
Optionally, the driving unit includes:Thyristor driving circuit and motor-drive circuit, the thyristor driver electricity Road and the motor-drive circuit are connect with the main control unit, are respectively used to drive the thyristor cell and the motor Device.
Optionally, the commutation disconnecting link is using the disconnecting link of single-pole three throw and equipped with corresponding arc-control device.
Optionally, the movable contact of the commutation disconnecting link is connect using rotation or parallel mode with each stationary contact.
A kind of three-phase imbalance commutation device provided by the utility model has following beneficial effect:
The utility model may be implemented the real-time monitoring of three-phase imbalance and not fallen by thyristor and switch unit completion Electric commutation overcomes traditional artificial power-off and relocates problem, and reduces the damage to commutation disconnecting link in voltage over zero switching To prolong its service life.
Detailed description of the invention
It, below will be to attached drawing needed in the embodiment in order to illustrate more clearly of the technical solution of the utility model It is briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore is not construed as Restriction to scope of protection of the utility model.For those of ordinary skill in the art, before not making the creative labor It puts, can also be obtained according to these attached drawings other relevant attached drawings.
Fig. 1 is the application schematic diagram of the three-phase imbalance commutation device of the utility model embodiment;
Fig. 2 is the structural schematic diagram of the three-phase imbalance commutation device of the utility model embodiment;
Fig. 3 is the structural schematic diagram of the thyristor cell of the three-phase imbalance commutation device of the utility model embodiment.
Fig. 4 is the structural schematic diagram of the switch unit of the three-phase imbalance commutation device of the utility model embodiment;
Fig. 5 is the structural schematic diagram of the current acquisition unit of the three-phase imbalance commutation device of the utility model embodiment;
Fig. 6 (a) to Fig. 6 (c) is that the voltage zero-cross of the three-phase imbalance commutation device of the utility model embodiment detects list The circuit of member;
Fig. 7 is the structural schematic diagram of the driving unit of the three-phase imbalance commutation device of the utility model embodiment;
Fig. 8 is the commutation process schematic diagram of the three-phase imbalance commutation device of the utility model embodiment;
Fig. 9 is another structural schematic diagram of the three-phase imbalance commutation device of the utility model embodiment.
Main element symbol description:
Three-phase imbalance commutation device -10;Current acquisition unit -100;- 110 amplification treatment circuit of current transformer- 120;Analog to digital conversion circuit -130;Voltage zero-cross detection unit -200;Main control unit -300;Driving unit -400;Thyristor drives Dynamic circuit -410;Motor-drive circuit -420;Thyristor cell -500;Switch unit -600;Commutation disconnecting link -610;Motor dress Set -620;Timing trigger unit -90;Protection location 700.
Specific embodiment
Hereinafter, the various embodiments of the disclosure will be described more fully.The disclosure can have various embodiments, and It can adjust and change wherein.It should be understood, however, that:There is no disclosure protection scope is limited to specific reality disclosed herein The intention of example is applied, but the disclosure should be interpreted as to all in the spirit and scope for covering the various embodiments for falling into the disclosure Adjustment, equivalent and/or optinal plan.
Hereinafter, can the term " includes " used in the various embodiments of the disclosure or " may include " instruction disclosed in Function, operation or the presence of element, and do not limit the increase of one or more functions, operation or element.In addition, such as existing Used in the various embodiments of the disclosure, term " includes ", " having " and its cognate are meant only to indicate special characteristic, number Word, step, operation, the combination of element, component or aforementioned item, and be understood not to exclude first one or more other Feature, number, step, operation, element, component or aforementioned item combined presence or increase one or more features, number, Step, operation, element, component or aforementioned item combination a possibility that.
The statement (" first ", " second " etc.) used in the various embodiments of the disclosure can be modified in various implementations Various constituent element in example, but respective sets can not be limited into element.For example, the above statement is not intended to limit the suitable of the element Sequence and/or importance.The above statement is only used for the purpose for differentiating an element and other elements.For example, the first user fills It sets and indicates different user device with second user device, although the two is all user apparatus.For example, not departing from each of the disclosure In the case where the range of kind embodiment, first element is referred to alternatively as second element, and similarly, second element is also referred to as first Element.
It should be noted that:It, can be by the first composition member if a constituent element ' attach ' to another constituent element by description Part is directly connected to the second constituent element, and " connection " third can form between the first constituent element and the second constituent element Element.On the contrary, when a constituent element " being directly connected to " is arrived another constituent element, it will be appreciated that in the first constituent element And second third constituent element is not present between constituent element.
The term used in the various embodiments of the disclosure " user " can be indicated using the people of electronic device or using electricity The device (for example, artificial intelligence electronic device) of sub-device.
The term used in the various embodiments of the disclosure is used only for the purpose of describing specific embodiments and not anticipates In the various embodiments of the limitation disclosure.Unless otherwise defined, otherwise all terms used herein (including technical term and Scientific term) there is contain identical with the various normally understood meanings of embodiment one skilled in the art of the disclosure Justice.The term (term such as limited in the dictionary generally used) be to be interpreted as have in the related technical field The identical meaning of situational meaning and Utopian meaning or meaning too formal will be interpreted as having, unless this It is clearly defined in disclosed various embodiments.
With reference to the accompanying drawing, it elaborates to specific embodiment of the present utility model.
Referring to Fig.1, the utility model provides a kind of three-phase imbalance commutation device, can be used for the 380V/ of three-phase four-wire system 220V low-voltage distribution system, the case where being able to detect three-phase imbalance, simultaneously pass through thyristor and commutation knife according to default commutation rule Lock etc. automatically adjusts the line attachment of single-phase load, and the artificial power-off of traditional dependence is overcome to relocate to be balanced adjustment Problem.
Referring to a kind of three-phase imbalance commutation device 10 that Fig. 2, the present embodiment are proposed, including:Current acquisition unit 100, Voltage zero-cross detection unit 200, main control unit 300, driving unit 400, thyristor cell 500 and switch unit 600.
Current acquisition unit 100 and the input terminal of voltage zero-cross detection unit 200 are all connected with each phase of three-phase, output end It is all connected with main control unit 300.The input terminal of driving unit 400 connects main control unit 300, and output end is separately connected thyristor list The control terminal of member 500 and switch unit 600.
Referring to Fig. 3, the input terminal of thyristor cell 500 is connected to each phase of three-phase, and output end is connected to single-phase load, Its control terminal connects driving unit 400.Wherein, thyristor cell 500 includes 3 thyristors, each thyristor and three-phase it is each Mutually connect one to one.
Referring to Fig. 4, the input terminal of switch unit 600 is connected to each phase of three-phase, and output end is connected to single-phase load.Its In, switch unit 600 includes commutation disconnecting link 610 and electric machine 620, and electric machine 620 connects driving unit 400 and commutation knife Lock 610;The static contact of commutation disconnecting link 610 is separately connected each phase of three-phase, and moving contact connects single-phase load.
Specifically, current acquisition unit 100 is used to detect the real-time current of each phase of three-phase.Referring to Fig. 5, current acquisition list Member 100 may include current transformer 110, amplification treatment circuit 120 and analog to digital conversion circuit 130.Current transformer 110 will acquire Signal amplification treatment circuit 120 is accessed after sampling resistor is converted into voltage signal.Amplification treatment circuit 120 can specifically wrap Signal amplifier, low-pass filter and inverting integrator etc. are included, is respectively used to carry out signal amplification, filter to collected small signal Involve the processing such as reverse phase integral, to keep the analog signal of output more accurate, reliable.It then will by analog to digital conversion circuit 130 The acquisition signal of conditioning output is converted to digital signal and is sent into main control unit 300, is finally handled and is obtained pair by main control unit 300 Answer the real-time current of phase line.Preferably, the A/D converter in the analog to digital conversion circuit 130 in the present embodiment, which can be used, gradually forces The conversion chip of nearly formula completes analog-to-digital conversion, and the conversion accuracy and conversion time of the family chip can reach acquisition and require, Such as 8 ADC0809.
Voltage zero-cross detection unit 200 is used to detect signal when each phase voltage zero passage of three-phase.Referring to Fig. 6 (a) to Fig. 6 (c), voltage zero-cross detection unit 200 may include 3 single-phase zero cross detection circuits, be respectively used to detect the zero cross signal of each phase. The single-phase zero-crossing detection circuit as shown in Fig. 6 (a), for detecting the voltage over zero of A phase.The circuit includes first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5 and difference amplifier U.A phase voltage signal passes through first The non-inverting input terminal of resistance R1 connection difference amplifier U;One end connection first resistor R1's and difference amplifier U of 5th resistance R5 is same Phase input terminal, other end ground connection.B phase then passes through the inverting input terminal of second resistance R2 connection difference amplifier U, the 4th resistance R4 One end connection second resistance R2 and difference amplifier U inverting input terminal, the other end ground connection.C phase passes through 3rd resistor R3 company Second resistance R2 and the 4th resistance R4 are met, the output end of difference amplifier U exports the voltage over zero signal of A phase, wherein B phase and C The position of phase can be interchanged.Similarly, Fig. 6 (b) and Fig. 6 (c) is respectively the single-phase zero cross detection circuit of B phase and C phase, they have There is identical structure.Voltage zero-cross detection unit 200 in the present embodiment by carrying out signed magnitude arithmetic(al) to three-phase voltage signal, It is contemplated that the correlation of three-phase voltage, and three-phase common-mode signal can be eliminated using differential type detection, further decrease interference Influence of the signal to zero-crossing examination.
Main control unit 300 is used to calculate tri-phase unbalance factor simultaneously according to the collected real-time current of current acquisition unit 100 Judge whether obtained tri-phase unbalance factor is more than preset threshold.It is main when obtained tri-phase unbalance factor is more than preset threshold It controls unit 300 and corresponding control command is then sent to driving circuit according to the voltage zero-crossing signal of preset commutation rule and each phase 300, it is operated to complete corresponding commutation by 300 drive control thyristor cell 500 of driving circuit and switch unit 600.Institute State default commutation rule can self-defining according to actual needs, the commutation rule in the present embodiment is will be in the biggish phase line of electric current Single-phase load be switched in the lesser phase line of electric current.Wherein, main control unit 300 includes microprocessor, which can adopt Use arm processor.Arm processor has small in size, low-power consumption, low cost, high-performance, instruction execution speed fastly and execution efficiency The features such as high.
Driving unit 400 is used to drive thyristor cell 500 and motor according to the control command that main control unit 300 is sent Device 620.Referring to Fig. 7, driving unit 400 includes thyristor driving circuit 410 and motor-drive circuit 420, thyristor driver Circuit 410 connects the control terminal of thyristor cell 500, for driving being turned on and off for each thyristor.Motor-drive circuit 420 The control terminal for connecting electric machine 620, is rotated for the motor in drive motor means 620.Optionally, which uses High-speed motor or variable speed machine.
Thyristor cell 500 and switch unit 600 are for completing the switching of phase line in the case where single-phase load does not power off. Thyristor cell 500 is used to provide temporary electric current for single-phase load during commutation disconnecting link 610 switches phase line, to make list Phase load not power down in commutation process.Switch unit 600 is used in turn on thyristors according to motor in electric machine 620 Rotation drive commutation disconnecting link 610 moving contact rotation or movement so that connection single-phase load moving contact and three-phase it is a certain Static contact connection, to complete the phase line switching of single-phase load.Wherein, the moving contact of commutation disconnecting link 610 can be moved using rotation Flowing mode is contacted with static contact, can also be contacted using parallel mobile mode with static contact.For example, referring to Fig. 8, if having judged three Mutually there is uneven situation and need single-phase load being switched to B phase by the C phase being currently located, and assumes that C phase is switched to B phase The angle of motor rotation is 60 degree, then by the turn on thyristors of C phase and in C phase voltage zero passage before C phase voltage zero crossing reaches Commutation disconnecting link 610 is disconnected from C phase and rotates 60 degree by point.Then the thyristor shutdown of C phase is simultaneously simultaneously led the thyristor of B phase It is logical, commutation disconnecting link 610 is closed in B phase then, then turns off the thyristor of B phase, then completes the commutation of single-phase load.It is excellent Selection of land, commutation disconnecting link 610 can be used the disconnecting link of single-pole three throw simultaneously while equipped with corresponding arc-control device, such as use vacuum interrupter In or increase corresponding arc-extinguish chamber etc..
Referring to Fig. 9, optionally, a kind of three-phase imbalance commutation device 10 that the embodiments of the present invention propose can be with Including:Timing trigger unit 90, timing trigger unit 90 is connect with current acquisition unit 100, for regularly sending current acquisition Signal is timed acquisition with trigger current acquisition unit 100.Specifically, timing trigger unit 90 may include timer and triggering Device, timer are sequentially connected with trigger.Therefore timing acquiring three-phase current can make collected data more uniform, may be used also To reduce the power consumption etc. of real-time acquisition and processing.
Optionally, a kind of three-phase imbalance commutation device 10 of the embodiments of the present invention proposition can also include:It protects Unit 700 is protected, protection location 700 connects single-phase load and switch unit 600, is used for when short circuit or overcurrent occur for phase line to list Phase load is protected.
The real-time detection of three-phase imbalance may be implemented in a kind of three-phase imbalance commutation device proposed through this embodiment And commutation is not powered off in voltage over zero completion single-phase load, by the easily-controllable and oncontacting dot characteristics using thyristor, make crystalline substance Brake tube work play the role of during switching moment inhibition shove, over-voltage and arcing;And use mechanical commutation disconnecting link It is able to achieve and is reliably closed and reduces the calorific value that phase-change switch generates in commutation process.Meanwhile also using in voltage over zero Switching, can reduce the damage to commutation disconnecting link and prolong its service life.
It will be appreciated by those skilled in the art that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, module in attached drawing or Process is not necessarily implemented necessary to the utility model.
It will be appreciated by those skilled in the art that the module in device in implement scene can be described according to implement scene into Row is distributed in the device of implement scene, can also be carried out corresponding change and is located at the one or more dresses for being different from this implement scene In setting.The module of above-mentioned implement scene can be merged into a module, can also be further split into multiple submodule.
Above-mentioned the utility model serial number is for illustration only, does not represent the superiority and inferiority of implement scene.Disclosed above is only this Several specific implementation scenes of utility model, still, the utility model is not limited to this, any those skilled in the art's energy Think of variation should all fall into the protection scope of the utility model.

Claims (10)

1. a kind of three-phase imbalance commutation device, which is characterized in that including:Current acquisition unit, main control unit, voltage zero-cross inspection Survey unit, driving unit, thyristor cell and switch unit;
The current acquisition unit and the voltage zero-cross detection unit be all connected with three-phase it is each mutually and the main control unit;
The main control unit connects the driving unit;
The thyristor cell is connected to each phase of the three-phase and single-phase load, control terminal connect the driving unit, In, the thyristor cell includes 3 thyristors, and each thyristor respectively mutually connects one to one with three-phase;
The switch unit is connected to each phase and single-phase load of the three-phase, wherein the switch unit includes commutation disconnecting link And electric machine, the electric machine connect the driving unit and the commutation disconnecting link, the static contact point of the commutation disconnecting link Not Lian Jie three-phase each phase, moving contact connects the single-phase load.
2. three-phase imbalance commutation device according to claim 1, which is characterized in that the voltage zero-cross detection unit packet 3 single-phase zero cross detection circuits are included, each single-phase zero cross detection circuit is used to detect its voltage over zero for corresponding to phase line.
3. three-phase imbalance commutation device according to claim 2, which is characterized in that the single-phase zero cross detection circuit packet It includes:First resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance and difference amplifier;
It is detected the non-inverting input terminal that the difference amplifier is mutually connected by the first resistor, one end of the 5th resistance connects Connect the non-inverting input terminal, other end ground connection;A phase in remaining two-phase connects the difference amplifier by the second resistance Inverting input terminal, one end of the 4th resistance connects the second resistance and the inverting input terminal, other end ground connection;It is surplus Under a phase by the 3rd resistor connect the second resistance and the 4th resistance, the output end of the difference amplifier it is defeated The voltage over zero signal of the detected phase out.
4. three-phase imbalance commutation device according to claim 1, which is characterized in that further include:Timing trigger unit, institute It states timing trigger unit to connect with the current acquisition unit, be adopted for regularly sending current acquisition signal with triggering the electric current Collection unit is acquired.
5. three-phase imbalance commutation device according to claim 1, which is characterized in that further include:Protection location, the guarantor Shield unit is connect with the switch unit and the single-phase load, is used for when short circuit or overcurrent occur for route to described single-phase negative Lotus is protected.
6. three-phase imbalance commutation device according to claim 1, which is characterized in that the current acquisition unit includes: Current transformer, amplification treatment circuit and analog to digital conversion circuit, the current transformer, the amplification treatment circuit and the mould Number conversion circuit is sequentially connected, for acquiring the real-time current of three-phase.
7. three-phase imbalance commutation device according to claim 6, which is characterized in that the amplification treatment circuit includes: Signal amplifier, low-pass filter and inverting integrator, the signal amplifier, the low-pass filter and reverse phase integral Device is sequentially connected, for being improved accordingly collected signal.
8. three-phase imbalance commutation device according to claim 1, which is characterized in that the driving unit includes:Brilliant lock Tube drive circuit and motor-drive circuit, the thyristor driving circuit and the motor-drive circuit with the main control unit Connection, is respectively used to drive the thyristor cell and the electric machine.
9. three-phase imbalance commutation device according to claim 1, which is characterized in that the commutation disconnecting link uses hilted broadsword three The disconnecting link thrown and equipped with corresponding arc-control device.
10. three-phase imbalance commutation device according to claim 1, which is characterized in that the movable contact of the commutation disconnecting link It is connect using rotation or parallel mode with each stationary contact.
CN201820687812.1U 2018-05-03 2018-05-03 Three-phase imbalance commutation device Active CN208158131U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109802407A (en) * 2019-01-14 2019-05-24 国网江西省电力有限公司电力科学研究院 A kind of phase-change switch device and its control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109802407A (en) * 2019-01-14 2019-05-24 国网江西省电力有限公司电力科学研究院 A kind of phase-change switch device and its control method

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