CN105914763A - Novel intelligent phase change switch and method for distribution network - Google Patents
Novel intelligent phase change switch and method for distribution network Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses a phase change device, which comprises a communication module, a period measurement module, multiple contactless switch units, a storage module and a central processing module, wherein the communication module is used for receiving a phase change instruction for changing from the current phase to a target phase; the period measurement module is used for acquiring a current period T1 of the current phase of the user and a voltage period T2 of the target phase to which the user needs to be accessed; the multiple contactless switch units are used for connecting the user with a three-phase AC bus via the multiple contactless switch units; the storage module is used for pre-storing conduction time of the multiple contactless switch units; and the central processing module is used for changing the user from the current phase to the target phase. Thus, three-phase load balanced management can be realized, and a distribution transformer can be well protected.
Description
Technical field
Generally the invention belongs to power domain, particularly to a kind of commutation device and method.
Background technology
In China's power distribution network, power consumer is numerous and position disperses, and there is the unbalanced list of substantial amounts of spatial and temporal distributions
Phase load, causes most power distribution station to there is three-phase load unbalance problem in various degree.We are by distribution
The region that transformator is powered becomes power distribution station, as it is shown in figure 1, distribution transformer through three-phase alternating current bus A,
The outside power transmission of B, C, user 1, user 2 ... user n is connected with three-phase alternating current bus respectively, with user 1
As a example by, user 1 is connected by mechanical contact switch KA1 and A phase, is connected by KB1 with B phase, logical
Crossing KC1 with C phase to be connected, in generally power supply, KA1, KB1, KC1 only have a Guan Bi, KA1 in Fig. 1
Guan Bi, then user 1 accessed A to, in like manner user 2 has accessed B phase, and user n has accessed C phase.By
Different in each user power utilization equipment, the most easily cause three alternate load unbalanced.Such as bear greatly when too much
After lotus (high-power) user accesses A phase, A phase load can be made to sharply increase, B phase or C phase are owing to accessing
User is less, and load is relatively light, the most just causes the alternate imbalance of A, B, C tri-.Three-phase is born
Lotus imbalance can cause distribution transformer and charge circuit loss to increase, and voltage supplied Quality Down, electric energy is changed
Efficiency declines, and distribution transformer running temperature rises high a series of harm.
It is to this, in order to solve three-phase load unbalance problem in prior art, general by unit-area management terminal,
Monitor the operating condition of distribution transformer, in the case of three-phase load unbalance is out-of-limit, unit-area management in real time
Terminal the most optionally remote terminal load carry out commutation, the separate load of heavy duty will be hung over,
It is switched to underloading separate, to reach the purpose of balancing the load.With continued reference to Fig. 1, such as excessive when A phase load
Time, now unit-area management terminal sends commutation instruction, switchs KA1 and open after receiving instruction, and KB1 closes,
The most just user 1 has been switched to B phase by A phase, alleviated A phase load so that each alternate rebalancing.
But the opportunity that in this commutation process, mechanical contact switch is opened and closed is more random, and it is for being used by electricity
The impact of family and switch is the biggest, all can produce electric arc opening, have in short-term during switching in closing course
Power failure, this interruption is can not be received in some important power supply occasions (such as hospital etc.).
Summary of the invention
For the defect of prior art, the invention provides a kind of commutation device and method.
A kind of commutation device, including: communication module, for receiving from the commutation currently switching to target phase mutually
Instruction；Period measurement module, to access for the current cycle T1 and user obtaining the current phase in user place
The voltage cycle T2 of target phase；Multiple noncontacting switch unit, for through the plurality of noncontacting switch list
User is connected by unit respectively with described three-phase alternating current bus；Memory module, for the plurality of oncontacting of pre-stored
The ON time of some switch element；Central processing module, for receive described commutation instruction initial time
Carve t0, according to leading of the noncontacting switch unit of the current cycle T1 of described current phase and the current phase of pre-stored
The shutoff of the logical current phase of Time Calculation triggers moment tc so that turn off current at current phase current zero-acrross ing moment t1
The noncontacting switch unit of phase, and after turning off the noncontacting switch unit of current phase, according to described target
The ON time of the noncontacting switch unit of the voltage cycle T2 of phase and the target phase of pre-stored calculates target phase
Conducting triggers moment to so that turn on the noncontacting switch list of target phase at the voltage zero-cross moment t2 of target phase
Unit.Described central processing module is additionally operable to, when reading the current over-zero of the previous moment current phase adjacent with t0
Between put t1 ', calculate t1, t1=T1/2-t1 ', calculate tc, tc=t1-Δ t1.Described central processing module is also
For, read the time voltage crosses zero point t2 ' of the subsequent time target phase adjacent with t1, calculate t2,
T2=T2/2-t2 ', calculates to, to=t2-Δ t2.Described central processing module is additionally operable to, after the t1 moment
Read voltage or the current value of current phase user side, after judging that the voltage of user side or current value are as zero, meter
Calculate the voltage zero-cross moment t2 of subsequent time target phase.Also include, waveform conversion module, for intersecting three
The AC signal of stream bus becomes square-wave signal.Also include, along detection module, be used for detecting described square wave letter
Number rising edge and trailing edge；Described central processing module, for judging according to described rising edge and trailing edge
The current zero-crossing point of current phase and the voltage over zero of target phase.Also include, period measurement module, for right
Rising edge and trailing edge count, and calculate current cycle T1 and the target of described current phase according to count results
The current cycle T2 of phase.Also include Intelligent management terminal, for calculating each phase load of three-phase alternating current bus,
When the difference of each phase load sends described commutation instruction more than when setting threshold value to commutation device.
A kind of phase change method, it is characterised in that comprise the following steps: S100: receive from currently switching to mutually
The commutation instruction of target phase；S200: the current cycle T1 and the user that obtain the current phase in user place to access
The voltage cycle T2 of target phase；S300: through multiple noncontacting switch unit by user respectively with described three-phase
Ac bus is connected；The ON time of S400: pre-stored the plurality of noncontacting switch unit；S500:
Receiving the initial time t0 of described commutation instruction, according to current cycle T1 and the pre-stored of described current phase
Current phase noncontacting switch unit ON time calculate current phase shutoff trigger moment tc so that
Current phase current zero-acrross ing moment t1 turns off the noncontacting switch unit of current phase, and is turning off the oncontacting of current phase
After some switch element, open according to the voltage cycle T2 of described target phase and the contactless of target phase of pre-stored
The ON time closing unit calculates the conducting triggering moment to of target phase so that when the voltage zero-cross of target phase
Carve the noncontacting switch unit of t2 conducting target phase.Described step S500 also includes, reads adjacent with t0
The time current crosses zero point t1 ' of the current phase of previous moment, calculates t1, t1=T1/2-t1 ', calculates tc,
Tc=t1-Δ t1.
The invention has the beneficial effects as follows: when there is three-phase imbalance in power distribution station, will result in three-phase imbalance
Single-phase load power-off after, the mode of switching to another phase adjusts three-phrase burden balance, changes at loaded termination
Use intelligent seamless commutation technology to switch in short-term during Xiang, make the end-user experience switching less than commutation
Journey, protects electrical equipment simultaneously to greatest extent；Accurate zero passage commutation controls, and produces without harmonic wave, switching
No-flashy-flow, and without conduction voltage drop and loss, it is not necessary to thermal component；Use contactless electronic beam switch element conduct
The actuator of commutation operation, bearing capacity is very big, and service life is long, turns on, at zero electricity at no-voltage
Turn off at stream, switching transient effect can be reduced, reduce the impact to user power utilization equipment.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art of the present invention；
Fig. 2 is overall structure schematic diagram of the present invention；
Fig. 3 is the structural representation of commutation device of the present invention；
Fig. 4 is the structural representation of control unit of the present invention；
Fig. 5 is commutation oscillogram of the present invention；
Fig. 6 is the flow chart of phase change method of the present invention.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, the most right
The detailed description of the invention of the present invention is described in detail, and makes the above and other purpose of the present invention, feature and excellent
Will definitely become apparent from.The part that reference instruction identical in whole accompanying drawings is identical.The most deliberately by than
Example draws accompanying drawing, it is preferred that emphasis is illustrate the purport of the present invention.
Embodiment 1
Refer to Fig. 2 first the overall structure of the present invention is introduced.In the present invention, Intelligent management terminal is used for
The load of each phase of three-phase alternating current bus A, B, C of detection distribution transformer, electrical quantity measurement arrangement such as electric current
The parameters such as the voltage of three-phase alternating current bus A, B, C, electric current measured by table, voltmeter etc., these parameters passed
Transporting to Intelligent management terminal, the commutation device that Intelligent management terminal is installed on various places with dispersion is in communication with each other, root
Send out to corresponding device according to the load of the three-phase alternating current each phase of bus A, B, C and the load condition of each commutation device
Going out commutation instruction, commutation device performs commutation operation after receiving this commutation instruction.Intelligent management terminal also may be used
To be communicated with Surveillance center by such as GPRS, so that the state of Intelligent management terminal is sent to Surveillance center,
Or receive the commutation threshold value that Surveillance center sends.
Refer to Fig. 3, user by tri-electric lines of force of a, b, c respectively with three-phase alternating current bus A, B, C phase
Even, A cross streams bus connecting and has A phase the first detector unit SA1, a phase electric lines of force is contactless with A phase to be opened
Closing unit TA to be connected, TA connects user through A phase the second detector unit SA2；Same, B cross streams bus
Upper connection has B phase the first detector unit SB1, b phase electric lines of force to be connected with B phase noncontacting switch unit TB,
TB connects user through A phase the second detector unit SA2；Connect on C cross streams bus and have C phase first to detect list
Unit's SC1, c phase electric lines of force is connected with C phase noncontacting switch unit TC, and TC is through C phase the second detector unit SC2
Connect user.First detector unit SA1, SB1, SC1, the second detector unit SA2, SB2, SC2, respectively
Being connected with control unit, the outfan of control unit connects noncontacting switch unit TA, TB, TC.Control single
Unit is by communication module and Intelligent management terminal communication, to receive the commutation instruction that Intelligent management terminal sends.
TA, TB, TC can use the power electronic devices such as IGCT, IGBT, in this kind of power electronic devices
There is not mechanical contact in portion, can be controlled conducting and the shutoff of noncontacting switch unit by control signal,
As a example by IGCT, in Fig. 1, control unit is extremely connected with the control of IGCT, when the high electricity of control unit output
Ordinary mail number is to after the control extremely of TA, and TA turns on, then user is access in A phase, accordingly, when TA controls pole
After level step-down, user disconnects from A phase.First detector unit SA1, SB1, SC1 be respectively used to detect A,
The signals of telecommunication such as the voltage of B, C three-phase bus, electric current, frequency, the second detector unit SA2, SB2, SC2 divide
The electricity such as outgoing line side (i.e. user side) voltage, electric current, the frequency that Yong Yu not detect a, b, c three-phase power line
Signal, these signals of telecommunication detected all are admitted to control unit.
Intelligent management terminal according to the detected signal of telecommunication, calculate the load LA of A, B, C three-phase, LB,
, there is multiple Load Calculation Method in prior art, do not repeat them here in LC.Difference when three alternate loads
After value exceedes setting commutation threshold value, Intelligent management terminal sends commutation by communication module to commutation device and instructs,
User from currently switching to the phase that load is the lightest mutually, thus is maintained three-phase alternating current bus by control unit
Balancing the load.Below against Fig. 4, Fig. 5, this is described in further detail.
As shown in Figure 4, control unit includes waveform conversion module, and it is connected with A, B, C three-phase bus,
For the three-phase ac signal of input is become square-wave signal；Along detection module, for detecting square-wave signal
Rising edge and trailing edge, be respectively fed to central processing module and week along the edge signal detected by detection module
Phase measurement module；Period measurement module, for counting rising edge and trailing edge, according to count results
Calculate the periodic quantity of A, B, C three-phase, and periodic quantity is inputted central processing module；A/D modular converter, its
It is connected with SA1, SB1, SC1, SA2, SB2, SC2, for by the analog voltage detected, current signal
Be converted to digital signal；Communication module, for receiving the commutation instruction that Intelligent management terminal is sent.Storage
Module, it can use such as nonvolatile memory etc., in memory module at least storage have switch element TA,
The ON time characteristic of TB, TC, so-called ON time refers to switch element and receives after turn-on command extremely
Its fully on required time, such as IGCT, when control unit sends to the control pole of TA
After high level signal, the output end voltage of TA can gradually rise, and after TA is fully on, its input is with defeated
Going out terminal voltage equal (not considering TA self pressure drop), this process required time is referred to as ON time, turns off
Process is contrary with this process, and i.e. after control pole becomes low level, the output end voltage of TA can be gradually decrease to
Zero, the ON time of different components and parts is different typically each in ms level, and ON time can be surveyed by experiment
, the present invention in order to be accurately controlled the commutation moment, leading of TA, TB, TC of pre-stored in memory module
Logical time response.
In the present invention, central processing module, when judging to need commutation, according to along detected by detection module
Edge signal judge that user is currently located the current zero-crossing point of phase, and combine cycle of current phase and switch is single
The ON time characteristic of unit, calculates user and is currently located the shutoff triggering moment of phase, trigger the moment in shutoff and send out
Go out and turn off instruction, thus at the current zero-crossing point of current phase by user from currently disconnecting mutually；Then, centre
According to along the edge signal detected by detection module, reason module, judges that (i.e. user will access target phase
Phase) voltage over zero, and the ON time characteristic of the cycle of combining target phase and switch element, calculate mesh
The conducting of mark phase triggers the moment, sends turn-on command in the conducting triggering moment, thus in the voltage mistake of target phase
User is accessed target phase by zero point.Typically, for electrical equipment, when current over-zero by its power-off,
Do not interfere with the operation of electrical equipment, and when voltage zero-cross, electrical equipment is accessed, due to voltage be now
Zero, to impact minimum produced by electrical equipment, therefore present invention employs zero-current switching, no-voltage is led
Logical mode.
Refer to Fig. 5, by waveform conversion module, alternating voltage or the electric current of A, B, C three-phase are become square wave
Signal, this conversion can be realized by comparator, such as, as a example by A phase current, A phase current is sine
Waveshape, in positive half cycle current value more than 0, at negative half-cycle less than 0, comparator is big at current value accordingly
In 0 time, output amplitude is the square-wave signal of 1, is output as 0 at negative half-cycle, is the most just become by sine wave signal
For corresponding square-wave signal, the biphase conversion of B, C is identical with this, finally just exports through waveform conversion module
Square-wave signal shown in Fig. 4.Along detection module for detecting rising edge and the trailing edge of square-wave signal, on
Rise along identical with the zero-acrross ing moment of the alternating voltage of three-phase or electric current with the trailing edge place moment.As a example by A phase,
In the t1 moment, A phase current is by just becoming negative, and current over-zero, now corresponding with A square-wave signal is also at t1
Moment produces trailing edge, just may determine that the zero-acrross ing moment of A phase current by detecting this trailing edge.
Owing to electric power system exists various interference, the 50Hz that fundamental frequency is the most fixing is each alternate
Load also differ with running environment, each alternate frequency also can there are differences, in order to can accurately be at electricity
Stream zero-acrross ing moment breaks phase, accesses in the voltage zero-cross moment, and the present invention is provided with period measurement module, and it is to upper
Rise along counting with trailing edge, calculate the signal period T1 of current phase and the signal of target phase according to count value
Cycle T 2, also as a example by A phase, can produce 1 rising edge and 1 trailing edge in a current cycle, if
In 1s detected by cycle measurement module to rising edge and the sum of trailing edge be 25, then can draw A
The cycle T 1 of phase current is 1/25s, if sum is 50, T1 is 1/50s, in like manner can calculate B phase
Cycle T 2, T3 with C phase.T1, T2, T3 all send into central processing module.
The ON time Δ t1 of TA, TB, TC, Δ t2, Δ t3 it is pre-stored with in memory module；Set changes
Phase threshold value is Y, when difference is more than the threshold value set between LA, LB, LC, carries out commutation, manages terminal
Phase commutation device sends commutation instruction, if now for commutation start time t0.Before central processing module reads t0
The time current crosses zero point t1 ' of one moment current phase, calculates current phase according to the current cycle T1 of current phase
Next current over-zero moment t1, t1=T1/2-t1 ', after obtaining t1, central processing module is from memory module
Interior reading Δ t1, calculates to turn off and triggers moment tc, tc=t1-Δ t1, and when arriving tc, central processing module is sent out
Going out cut-off signals to the switch element of current phase, be so the moment of zero in t1 moment, i.e. electric current, switch is single
Unit turns off just.After arriving the t1 moment, central processing module reads the voltage of t1 previous moment target phase
Zero-crossing timing point t2 ', calculates next voltage zero-cross moment of target phase according to the current cycle T2 of target phase
T2, t2=T2/2-t2 ', after obtaining t2, central processing module reads leading of target phase in memory module
Logical time Δ t2, calculates conducting and triggers moment to, to=t2-Δ t2, and when arriving to, central processing module is sent out
Going out Continuity signal to the switch element of target phase, so in the t2 moment, i.e. target phase voltage is the moment of zero,
Switch element is opened just, and user is from currently having switched to target phase mutually.Owing to power cycle is usually 50Hz
Left and right, the interval time between t1 and t2 is the shortest, and is to turn off electrical equipment, so in the current over-zero moment
In commutation process, can be the least to customer impact, whole deciliter response time is the switching of Millisecond, uses
Family and common electrical equipment are imperceptible, substantially increase power supply reliability.
Further, if the conducting target phase when current phase not yet completely cuts through, then there will be phase fault,
In order to prevent the generation of this situation, in the present invention, central processing module reads the of current phase after the t1 moment
The voltage of the current phase user side detected by two detector units or current value, when voltage or current value are zero,
Start again to calculate next voltage zero-cross moment t2, so guarantee again user to be accessed mesh after current disconnection mutually
Mark phase, it is to avoid the appearance of phase fault.
As a example by switching to B phase from A phase, if Y is 50, the A phase current cycle is T1, the B phase voltage cycle
For T2, and at t0 moment LA=300, LB=100, LA-LB=300-100=200 ＞ 50, then in the t0 moment,
Central processing module reads the time current crosses zero point t1 ' of the previous moment A phase adjacent with t0, according to A phase
Current cycle T1 calculate A phase next current over-zero moment t1, t1=T1/2-t1 ', central processing module
In memory module, read A phase on time Δ t1, calculate A phase and turn off triggering moment tc, tc=t1-Δ t1,
When arriving tc, central processing module sends low level signal to the control pole of IGCT TA, so arrives
During t1 moment, i.e. electric current is the moment of zero, and TA turns off just.After arriving the t1 moment, central authorities process mould
Block reads the voltage detected by the second detector unit SA2 or the current value of A phase, in voltage and current value is
When zero, central processing module reads the time voltage crosses zero point t2 ' of t1 previous moment B phase, calculates B phase
Next voltage zero-cross moment t2, t2=T2/2-t2 ', after obtaining t2, central processing module is from memory module
The ON time Δ t2 of interior reading B phase, calculating B are conducted and trigger moment to, to=t2-Δ t2, arrive to
Time central processing module send high level signal to the control pole of IGCT TB, so in t2 moment, i.e. B
Phase voltage is the moment of zero, and TB opens just, and user is from currently having switched to target phase mutually.
Central processing module can use high performance MCU chip, have concurrently high efficiency digital signal processing capability and
The real-time control capability of microprogram control unit, core operating frequency is empty up to 120MHz, the program space and data
Between separately addressing, support parallel processing, FLASH, RAM of the suitable capacity of Embedded and abundant I/O
Module, and there is the intervalometer that multiple tape input catches, interrupt management is powerful.Carrier module uses FSK
The asynchronous serial port communications of modulation system, half-duplex mode and CPU, CPU uses DMA mode to read asynchronous string
Row mouth transceiving data, it is achieved with the data interaction of unit-area management terminal.CPU workflow is, system electrification or
After reset perform initialization operation, including sampled data initialize, communication data initialize, I/O port initialize,
AD sampling initialization etc.；Followed by self-test operations, reads frequency measurement square wave edge signal after self-inspection success and calculates
Real-time frequency, and synchronization control sampling interval；Use half-wave fourier transform algorithm calculate three-phase voltage,
Load current amplitude and phase place, it is achieved measure display and communication transporting function, realize simultaneously overvoltage, under-voltage,
Cross the defencive functions such as stream；After receiving commutation instruction, software real-time judge voltage, current sample waveform,
Intelligent seamless commutation technology is used accurately to send switching command, after commutation action completes, by carrier communication
Pass operating result；Software real time scan button, refreshes according to corresponding operation logarithmic code pipe display content,
Update corresponding LED light state simultaneously；CPU carries out running self-test operations at each cycle period, if
Fail self-test then sends alarm instruction, and locking intelligence phase-change switch.
Embodiment 2
Refer to Fig. 6, the invention also discloses a kind of phase change method accordingly, a kind of phase change method, including with
Lower step: S100: receive from the commutation instruction currently switching to target phase mutually；S200: obtain user place
The current cycle T1 of current phase and the voltage cycle T2 of user's target phase to be accessed；S300: through multiple nothings
User is connected by contact switch unit respectively with described three-phase alternating current bus；The plurality of nothing of S400: pre-stored
The ON time of contact switch unit；S500: receiving the initial time t0 of described commutation instruction, root
According to the current cycle T1 of described current phase and the ON time meter of the noncontacting switch unit of the current phase of pre-stored
The shutoff calculating current phase triggers moment tc so that turn off the oncontacting of current phase at current phase current zero-acrross ing moment t1
Point switch element, and after turning off the noncontacting switch unit of current phase, according to the voltage of described target phase
The ON time of the noncontacting switch unit of the target phase of cycle T 2 and pre-stored calculates the conducting of target phase and triggers
Moment to so that turn on the noncontacting switch unit of target phase at the voltage zero-cross moment t2 of target phase.Described
Step S500 also includes, reads the time current crosses zero point t1 ' of the previous moment current phase adjacent with t0,
Calculate t1, t1=T1/2-t1 ', calculate tc, tc=t1-Δ t1.
Each embodiment in this specification all uses the mode gone forward one by one to describe, and each embodiment stresses
Being all the difference with other embodiments, between each embodiment, identical similar part sees mutually.
For the present processes embodiment, due to itself and device embodiment basic simlarity, so the ratio described
Relatively simple, relevant part sees the part of device embodiment and illustrates.
Elaborate a lot of detail in the above description so that fully understanding the present invention.But more than retouch
Stating is only presently preferred embodiments of the present invention, and the present invention can be to be much different from other side described here
Formula is implemented, and therefore the present invention is not limited by disclosed above being embodied as.The most any it is familiar with this area
Technical staff, without departing under technical solution of the present invention ambit, may utilize method and the skill of the disclosure above
Technical solution of the present invention is made many possible variations and modification by art content, or be revised as equivalent variations etc.
Effect embodiment.Every content without departing from technical solution of the present invention, according to the present invention technical spirit to more than
Any simple modification, equivalent variations and the modification that embodiment is done, all still falls within technical solution of the present invention protection
In the range of.
Claims (10)
1. a commutation device, it is characterised in that including:
Communication module, for receiving from the commutation instruction currently switching to target phase mutually；
Period measurement module is to be accessed for the current cycle T1 and user obtaining the current phase in user place
The voltage cycle T2 of target phase；
Multiple noncontacting switch unit, for through the plurality of noncontacting switch unit by user respectively with described
Three-phase alternating current bus is connected；
Memory module, for the ON time of pre-stored the plurality of noncontacting switch unit；
Central processing module, for receiving described commutation instruction initial time t0, according to described currently
The ON time of the noncontacting switch unit of the current cycle T1 of phase and the current phase of pre-stored calculates current phase
Turn off and trigger moment tc so that turn off the noncontacting switch unit of current phase at current phase current zero-acrross ing moment t1,
And after turning off the noncontacting switch unit of current phase, according to the voltage cycle T2 of described target phase with prestore
The ON time of the noncontacting switch unit of the target phase of storage calculates the conducting of target phase and triggers moment to so that
The noncontacting switch unit of target phase is turned at the voltage zero-cross moment t2 of target phase.
Commutation device the most according to claim 1, it is characterised in that described central processing module is also used
In, read the time current crosses zero point t1 ' of the previous moment current phase adjacent with t0, calculate t1,
T1=T1/2-t1 ', calculates tc, tc=t1-Δ t1.
Commutation device the most according to claim 1, it is characterised in that described central processing module is also used
In, read the time voltage crosses zero point t2 ' of the subsequent time target phase adjacent with t1, calculate t2,
T2=T2/2-t2 ', calculates to, to=t2-Δ t2.
Commutation device the most according to claim 1, it is characterised in that described central processing module is also used
In, after the t1 moment, read voltage or the current value of current phase user side, judge voltage or the electricity of user side
After flow valuve is zero, calculate the voltage zero-cross moment t2 of subsequent time target phase.
Commutation device the most according to claim 1, it is characterised in that also include, waveform conversion module,
For the AC signal of three-phase alternating current bus is become square-wave signal.
Commutation device the most according to claim 5, it is characterised in that also include, along detection module,
For detecting rising edge and the trailing edge of described square-wave signal；Described central processing module, for according to described
Rising edge and trailing edge judge current zero-crossing point and the voltage over zero of target phase of current phase.
Commutation device the most according to claim 6, it is characterised in that also include, period measurement module,
For rising edge and trailing edge are counted, calculate the current cycle T1 of described current phase according to count results
Current cycle T2 with target phase.
Commutation device the most according to claim 1, it is characterised in that also include Intelligent management terminal,
For calculating each phase load of three-phase alternating current bus, when the difference of each phase load fills to commutation more than when setting threshold value
Put transmission described commutation instruction.
9. a phase change method, it is characterised in that comprise the following steps:
S100: receive from the commutation instruction currently switching to target phase mutually；
S200: obtain the current cycle T1 of user place current phase and the voltage of user's target phase to be accessed
Cycle T 2；
S300: user is connected with described three-phase alternating current bus respectively through multiple noncontacting switch unit；
The ON time of S400: pre-stored the plurality of noncontacting switch unit；
S500: receiving the initial time t0 of described commutation instruction, according to the electric current week of described current phase
When the ON time of the noncontacting switch unit of the current phase of phase T1 and pre-stored calculates the shutoff triggering of current phase
Carve tc so that turn off the noncontacting switch unit of current phase at current phase current zero-acrross ing moment t1, and turning off
After the noncontacting switch unit of current phase, according to voltage cycle T2 and the target of pre-stored of described target phase
The ON time of the noncontacting switch unit of phase calculates the conducting of target phase and triggers moment to so that in target phase
Voltage zero-cross moment t2 conducting target phase noncontacting switch unit.
10., according to claim 1 phase change method, it is characterised in that described step S500 also includes, read
The time current crosses zero point t1 ' of the current phase of the previous moment adjacent with t0, calculates t1, t1=T1/2-t1 ',
Calculate tc, tc=t1-Δ t1.
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