CN108736495A - A kind of novel phase-change switch device - Google Patents
A kind of novel phase-change switch device Download PDFInfo
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- CN108736495A CN108736495A CN201810717932.6A CN201810717932A CN108736495A CN 108736495 A CN108736495 A CN 108736495A CN 201810717932 A CN201810717932 A CN 201810717932A CN 108736495 A CN108736495 A CN 108736495A
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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 present invention provides a kind of novel phase-change switch device, the device includes monitoring unit, phase-change switch unit, compensating unit, and the monitoring unit includes control module, analog measurement module, phase-change switch triggering and feedback module, compensation triggering and feedback module, communication module；The control module receives the commutation order of communication module transmission and receives the voltage of analog measurement module acquisition, current signal, the control command to commutation switch unit and compensating unit is sent out by certain control strategy, and receives the information of two above module return.The phase-change switch device can avoid the commutation time present in conventional phase-change switch type three-phase load unbalance controlling device commutation process, can accomplish for zero switching time, ensure that power supply continuity.
Description
Technical field
This application involves a kind of novel phase-change switch devices, can be applied to power distribution station and solve taiwan area three-phase load unbalance
Problem.
Background technology
Power distribution network is in the end of electric system, and transmission range is long, and decompression level is more, and multi-point and wide-ranging, operating status is transported
Line mode and load variations are affected, these situations cause power distribution network to be in non-economy in certain area and period to run shape
State needs to carry out coordination control to voltage and the indexs such as idle.In the power supply system of low voltage three-phase four-wire system, electricity consumer is mostly
Single-phase load is single-phase mixed with three-phase load, and the difference of payload difference and electricity consumption time, therefore results in low pressure
The secular disequilibrium of power supply system threephase load.
For three-phase load unbalance, current main solution is uniform by load when having distribution network construction early period to plan
Distribution, in actual operation according to balancing the load situation, three-phase imbalance area in part is generally using manually or automatically switching
Capacitor group compensates.It manually adjusts, inefficiency influences power supply continuity.Even state-of-the-art thyristor point in addition
Phase switching capacitance group, can only solve the compensation problem of power factor, can not effectively balance three-phase load.
Currently there are two kinds of three-phase load unbalance controlling devices, is power electronics type and phase-change switch type respectively.Electricity
Power electron type three-phase imbalance controlling device is with IGBT (igbt) switches for core, using advanced PWM
Pulse modulation technology realizes a kind of totally digitilized power electronic equipment of transformation of electrical energy, can be directed to fluctuating load and carry out quickly
Effective dynamic passive compensation compensates voltage fluctuation and flicker, load unbalanced, power factor, harmonic wave, is effectively changing
Kind power quality.But there are the drawbacks such as own loss height, noise and harmonic pollution for it.Phase-change switch type three-phase load unbalance is controlled
Manage device, be it is a kind of dispersion be installed to power distribution station by switch single-phase load to different phases to realize the dress of three-phase load leveling
It sets, as shown in Figure 1, phase-change switch type three-phase load unbalance controlling device includes a master controller for being installed to taiwan area, one
The three-phase that is installed to of fixed number amount turns phase-change switch at single-phase load, master controller be responsible for measuring total three-phase voltage current and
The phase and voltage and current information each switched, by specific control strategy adjust phase-change switch with residing for single-phase load
Phase, to achieve the purpose that taiwan area total current leveling.
Invention content
When the commutation certainly existed in commutation process for current phase-change switch formula three-phase load unbalance controlling device
Between may influence the successional problem of user power utilization, the present invention proposes a kind of novel phase-change switch device, both ensure that commutation
The low advantage of switching mode three-phase load unbalance controlling device own loss, in turn avoids its commutation power-off time, compensates for it
Itself there are the shortcomings that.
The present invention provides a kind of novel phase-change switch device, the novel phase-change switch device includes：Monitoring unit changes
Phase switch unit, compensating unit；
The monitoring unit includes that control module, analog measurement module, phase-change switch triggering and feedback module, compensation touch
Hair and feedback module, communication module；
The communication module receives changes described in the main controller controls instruction and transmission of three-phase load unbalance controlling device
The feedback information of phase switching device is to the master controller；
The analog measurement module is used to acquire the voltage and or current information of phase-change switch unit and compensating unit,
And transmit this information to control module；
The phase-change switch triggering and feedback module are for being controlled and being acquired phase-change switch list to commutation switch unit
The feedback information of member；
The compensation triggering and feedback module are used to control compensating unit and acquire the feedback information of compensating unit；
The control module receives the control instruction of the communication module transmission, analog measurement module acquisition
Voltage and or current signal and phase-change switch triggering and feedback module and the compensation triggering and feedback module
Feedback information sends out the control command to the phase-change switch unit and the compensating unit by control strategy, completes single-phase
Any switching laws of the load in the alternate continuous electricity of alternating current three.
Illustratively, the current phase phase and amplitude before the control strategy is used to make compensating unit output and switches are consistent
Voltage waveform, then completing phase shift makes compensating unit export the voltage waveform consistent with target phase phase and amplitude.
Illustratively, the control strategy includes：Control module is controlled using PR, is changed in phase-change switch unit acquirement
After mutually instructing, start the compensating unit；
Power grid three-phase voltage is sampled, by PLL phase locking units into horizontal lock, obtains output voltage phase theta；
After the monitoring unit disconnects the current phase of phase-change switch unit, according to the target phase for obtaining being switched, choosing
Select phase phase shift range；
Selected phase shift phase and PLL phase locking unit output phases are done into summation process, by after ramp function with locking phase
Device output voltage U*Voltage vector is formed, Voltage Feedback controling parameter U is introduced0, by the phase locking unit output voltage U*And voltage
Feedback control parameter U0Superposition after PR controllers adjusting, generates PWM and controls arteries and veins as the input quantity of PR controllers
Punching controls the compensating unit and exports the voltage waveform consistent with current phase phase and amplitude.
Illustratively, the PR controllers include proportional controller and resonant regulator.
Illustratively, the resonant regulator includes that the input quantity of the PR controllers is passed throughWithAfterwards, defeated
Go out result；And it is superimposed with the output result of the proportional controller, the output quantity as PR controllers.
Illustratively, the phase-change switch unit further includes：At least one phase-change switch, wherein each phase-change switch includes
Two single-pole double-throw switch (SPDT)s and a single-pole single-throw switch (SPST)；Described two single-pole double-throw switch (SPDT)s are first switch and the second switch；
The single-pole single-throw switch (SPST) switchs for third；Power grid A connects line end and B connects, and line end is defeated with two of the first switch respectively
Enter terminal electrical connection；The leading-out terminal and power grid C of the first switch line end that connects are defeated with two of the second switch respectively
Enter terminal electrical connection；The leading-out terminal of the second switch passes sequentially through the third switch, current sensor and the simulation
Measure the electrical connection of test module input terminal；The both ends of the third switch are parallel with thyristor.
Illustratively, the phase-change switch unit further includes：The three-phase input end of the phase-change switch unit has identical
Structure, include the first parallel branch and the second parallel branch, first parallel branch include one switch, described second simultaneously
It includes a thyristor to join branch, and a fuse of connecting per phase branch, one end of three fuses connects current sensor jointly, so
It is electrically connected afterwards with analog measurement module input.
Illustratively, the compensating unit further includes single-phase full bridge inverter circuit or single-phase semi-bridge inversion circuit, to generate
Single-phase voltage waveform.
Illustratively, the compensating unit further includes the mode of full bridge rectifier or battery or super capacitor energy-storage, with
DC side energy is provided.
Illustratively, the communication mode of the communication module include wireless communication, power line carrier, PLC, fiber optic communication,
At least one of GPRS communications.
Illustratively, after phase-change switch unit obtains commutation instruction, start compensating unit and PR is passed through by PLL locking phases
The feedback of control and output voltage Uo, generate pwm pulse, and control compensating unit output is consistent with current phase phase and amplitude
Voltage waveform, monitoring unit disconnect the current phase of phase-change switch unit after, according to the target phase for obtaining being switched, control strategy
Still 240 ° of 120 ° of selected phase phase shift, after the completion of phase shift, compensating unit obtains the voltage consistent with target phase phase and amplitude
Waveform, monitoring unit connect phase-change switch unit object phase, compensating unit power cut-off.
The invention has the advantages and positive effects that：
Novel phase-change switch device can be used for three-phase load unbalance controlling device, make three-phase load unbalance controlling device
Have the function of conventional leveling taiwan area load, while also can avoid conventional phase-change switch type three-phase load unbalance controlling device
The commutation time present in commutation process can accomplish for zero switching time, ensure that power supply continuity.
Description of the drawings
The following drawings of the present invention is used to understand the present invention in this as the part of the present invention.Shown in the drawings of this hair
Bright embodiment and its description, principle used to explain the present invention.
In attached drawing：
Fig. 1 is the schematic diagram of phase-change switch type three-phase load unbalance controlling device in the prior art.
The schematic block diagram of Fig. 2 embodiments to realize the present invention.
The schematic block diagram of Fig. 3 another embodiments to realize the present invention.
The schematic block diagram of Fig. 4 another embodiments to realize the present invention.
The schematic control strategy schematic diagrames of Fig. 5 to realize the present invention.
Fig. 6 is one structural schematic diagram of phase-change switch unit.
Fig. 7 is another structural schematic diagram of phase-change switch unit.
Specific implementation mode
In order to enable the object, technical solutions and advantages of the present invention become apparent, root is described in detail below with reference to accompanying drawings
According to example embodiments of the present invention.Obviously, described embodiment is only a part of the embodiment of the present invention, rather than this hair
Bright whole embodiments, it should be appreciated that the present invention is not limited by example embodiment described herein.Based on described in the present invention
The embodiment of the present invention, those skilled in the art's obtained all other embodiment in the case where not making the creative labor
It should all fall under the scope of the present invention.
First, the diagrammatic view in principle of the phase-change switch device for realizing the embodiment of the present invention is described with reference to figure 2- Fig. 4
Figure.
As shown in figs 2-4, a kind of novel phase-change switch device, the device include monitoring unit 1, phase-change switch unit 2,
Compensating unit 3, the monitoring unit 1 include control module, analog measurement module, phase-change switch triggering and feedback module, benefit
Repay triggering and feedback module, communication module 11.
The communication module receives the instruction of three-phase load unbalance controlling device master controller and feeds back present apparatus
Feedback information is to the master controller；Different communication mode can be used in the communication module, including but not limited to wireless communication, electricity
Power carrier communication, fiber optic communication, GPRS communications etc..
The analog measurement module is used to acquire the voltage and current information of phase-change switch unit and compensating unit, and should
Information is transmitted to control module.
The phase-change switch triggering and feedback module are for being controlled and being acquired its feedback letter to device in phase-change switch
Breath.
The compensation triggering and feedback module are anti-for power electronic devices in compensating unit being controlled and being acquired it
Feedforward information.
The control module receives the commutation order of the communication module transmission and receives the acquisition of analog measurement module
Voltage and current signal, the control command to commutation switch unit and compensating unit is sent out by certain control strategy, and connect
The information of receipts phase-change switch triggering described above and feedback module and the compensation triggering and feedback module return.
The phase-change switch unit may be implemented single-phase load in three alternate any switching laws of alternating current, and realization method has
A variety of, as one embodiment, phase-change switch unit can take structure as shown in FIG. 6, the three-phase of phase-change switch unit defeated
Enter to hold structure having the same, include the first parallel branch and the second parallel branch, the first parallel branch includes a switch
(S1, S2, S3), the second parallel branch include a thyristor (T1, T2, T3), a fuse of connecting per phase branch, three fusing
One end of device connects current sensor jointly, is then electrically connected with analog measurement module input.
By taking A phases are switched to B phases as an example, when normal operation, A phase switches S1 is in closed state, other two-phases switch and
All thyristors are in off-state, load powered by A phases at this time.When terminal receives switching command, control module
Just trigger pulse is sent out to thyristor T1, turns off switch S1 after thyristor T1 conductings, waits for that S1 is complete switched off, remove thyristor T1's
Trigger signal, 1st primary current zero crossings of the thyristor T1 after removing start pulse signal turn off naturally.In order to avoid there is phase
Between short-circuit conditions, after detecting that A phase thyristors T1 is complete switched off, then trigger the thyristor T2 conducting of B phases, triggered after T2 conductings
B phase switches S2 is closed, and T2 is then disconnected, by B phase powering loads.So far, the separate handoff procedure knot of B phases is switched to by A phases
Beam.Other handoff procedures are similar with the above process, no longer describe herein.The phase-change switch unit can realize that handoff procedure is flat
Surely, rapidly, the power reguirements of sensibility load can be met.
As one embodiment, Fig. 7 shows another form of phase-change switch unit：The structure of phase-change switch unit is
Each phase-change switch includes two single-pole double-throw switch (SPDT)s and a single-pole single-throw switch (SPST)；Described two single-pole double-throw switch (SPDT)s are first
Switch and second switch；The single-pole single-throw switch (SPST) switchs for third；Power grid A connects line end and B connects line end is respectively with first
Two input terminals electrical connection of switch；The leading-out terminal and power grid C of the first switch connect line end respectively with second switch
Two input terminals electrical connection；The leading-out terminal of the second switch passes sequentially through third switch, current sensor and simulation
Measure the electrical connection of test module input terminal；The both ends of the third switch are parallel with thyristor.
Proposed by the present invention to use two single-pole double-throw switch (SPDT)s and a single-pole single-throw switch (SPST), the program is during commutation
Except that can accomplish " current over-zero is cut off, voltage zero-cross input " outside, three-phase switching mutually locking, is not in phase fault, and
And volume of switch is all smaller than other schemes, is conducive to the Miniaturization Design of switch.
The switch includes magnetic latching relay or contactor.
Various ways realization may be used in the compensating unit 3, and generation single-phase voltage waveform can be used described in the invention
Single-phase full bridge inverter circuit, a variety of topologys such as single-phase semi-bridge inversion circuit can also be used.
Various ways realization can be used in the DC side energy of the compensating unit, as one embodiment, as shown in figure 3,
DC voltage is obtained by rectification using exchange side, capacitance can be saved, rectification circuit 32 uses full-bridge rectification mode.As
One embodiment can be combined as shown in figure 4, carrying out energy storage using battery 33 or super capacitor 31 with user's energy storage.
Specific control strategy to realize the present invention is further elucidated below.Traditional PI Instantaneous control has structure letter
It is single, control parameter is easy to set, the advantages that being widely used, but there is steady-state errors under rest frame, cause grid-connected electricity
The deficiencies of harmonic wave of stream increases, robustness is small.
In one embodiment of the present of invention use proportional resonant control method (PR controls), can under rest frame with
Track reference current realizes zero steady-state error control, is effectively improved grid-connected current waveform, detailed process is as follows：
After phase-change switch obtains commutation instruction, start compensating unit, sampling power grid three-phase voltage UAN、UBN、UCNPass through
PLL phase locking units obtain an output voltage phase theta into horizontal lock, after monitoring unit disconnects the current phase of phase-change switch unit, root
According to the target phase for obtaining being switched, still 240 ° of 120 ° of selected phase phase shift is defeated by selected phase shift phase and PLL phase locking units
Go out phase and do summation process, by after ramp function ramp and trigonometric function cos with phase locking unit output voltage U*Form voltage arrow
Amount introduces Voltage Feedback controling parameter U0, the two superposition, as the input quantity of PR controllers, PR controllers include proportion adjustment
The input quantity of device P and resonant regulator, the PR controllers inputs proportional controller P, the knot of export ratio adjuster P all the way
Fruit；Another way inputs in resonant regulatorThen pass throughThen after carrying out amplitude limit, export resonance is adjusted
The result of device；Both the result of the proportional controller P and result of the resonant regulator, which are added after input saturation, finally produces
Raw PWM controls pulse, and control compensating unit exports the voltage waveform consistent with current phase phase and amplitude, after the completion of phase shift, mends
It repays unit and obtains the voltage waveform consistent with target phase phase and amplitude, monitoring unit connects phase-change switch unit object phase, mends
Repay unit power cut-off.
The above description is merely a specific embodiment or to the explanation of specific implementation mode, protection of the invention
Range is not limited thereto, and any one skilled in the art in the technical scope disclosed by the present invention, can be easily
Expect change or replacement, should be covered by the protection scope of the present invention.Protection scope of the present invention should be with claim
Subject to protection domain.
Claims (10)
1. a kind of novel phase-change switch device, which is characterized in that the novel phase-change switch device includes：Monitoring unit, commutation
Switch unit, compensating unit；
The monitoring unit include control module, analog measurement module, phase-change switch triggering and feedback module, compensation triggering and
Feedback module, communication module；
The communication module receives the main controller controls instruction of three-phase load unbalance controlling device and sends the commutation and opens
The feedback information of device is closed to the master controller；
The analog measurement module is used to acquire the voltage and or current information of phase-change switch unit and compensating unit, and will
The information is transmitted to control module；
The phase-change switch triggering and feedback module are for being controlled and being acquired phase-change switch unit to commutation switch unit
Feedback information；
The compensation triggering and feedback module are used to control compensating unit and acquire the feedback information of compensating unit；
The control module receives the electricity that the control instruction, the analog measurement module of the communication module transmission acquire
Pressure and/or the triggering of current signal and the phase-change switch and feedback module and the feedback of the compensation triggering and feedback module
Information sends out the control command to the phase-change switch unit and the compensating unit by control strategy, completes single-phase load
In any switching laws of the alternate continuous electricity of alternating current three.
2. novel phase-change switch device according to claim 1, which is characterized in that the control strategy is for making compensation list
Member output and the current phase phase and the consistent voltage waveform of amplitude before switching, then completing phase shift makes compensating unit output and mesh
Mark phase phase and the consistent voltage waveform of amplitude.
3. novel phase-change switch device according to claim 1, which is characterized in that the control strategy includes：Control mould
Block is controlled using PR, after the phase-change switch unit obtains commutation instruction, starts the compensating unit；
Power grid three-phase voltage is sampled, by PLL phase locking units into horizontal lock, obtains output voltage phase theta；
After the monitoring unit disconnects the current phase of phase-change switch unit, according to the target phase for obtaining being switched, phase is selected
Position phase shift range；
Selected phase shift phase and PLL phase locking unit output phases are done into summation process, by defeated with phase locking unit after ramp function
Go out voltage U*Voltage vector is formed, Voltage Feedback controling parameter U is introduced0, by the phase locking unit output voltage U*With Voltage Feedback control
Parameter U processed0Superposition after PR controllers adjusting, generates PWM and controls pulse, control institute as the input quantity of PR controllers
It states compensating unit and exports the voltage waveform consistent with current phase phase and amplitude.
4. novel phase-change switch device according to claim 3, which is characterized in that the PR controllers include proportion adjustment
Device and resonant regulator.
5. novel phase-change switch device according to claim 4, which is characterized in that the resonant regulator includes the PR
The input quantity of controller is passed throughWithAfterwards, result is exported；And be superimposed with the output result of the proportional controller,
Output quantity as PR controllers.
6. novel phase-change switch device according to claim 1, it is characterised in that：The phase-change switch unit further includes：
At least one phase-change switch, wherein each phase-change switch includes two single-pole double-throw switch (SPDT)s and a single-pole single-throw switch (SPST)；It is described
Two single-pole double-throw switch (SPDT)s are first switch and the second switch；The single-pole single-throw switch (SPST) switchs for third；Power grid A connects line end
It is electrically connected respectively with two input terminals of the first switch with the B line ends that connect；The leading-out terminal and electricity of the first switch
The net C line ends that connect are electrically connected with two input terminals of the second switch respectively；The leading-out terminal of the second switch is successively
It is electrically connected with the analog quantity test module input terminal by third switch, current sensor；The third switch
Both ends are parallel with thyristor.
7. novel phase-change switch device according to claim 1, it is characterised in that：The phase-change switch unit further includes：
The three-phase input end structure having the same of the phase-change switch unit, include the first parallel branch and the second parallel branch,
First parallel branch includes a switch, and second parallel branch includes a thyristor, a fuse of connecting per phase branch,
One end of three fuses connects current sensor jointly, is then electrically connected with analog measurement module input.
8. novel phase-change switch device according to claim 1, it is characterised in that：The compensating unit further includes single-phase complete
Bridge inverter circuit or single-phase semi-bridge inversion circuit, to generate single-phase voltage waveform.
9. novel phase-change switch device according to claim 1, it is characterised in that：The compensating unit further includes that full-bridge is whole
The mode of current circuit or battery or super capacitor energy-storage, to provide DC side energy.
10. novel phase-change switch device according to claim 1, it is characterised in that：The communication mode of the communication module
Including at least one of wireless communication, power line carrier, PLC, fiber optic communication, GPRS communications.
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| CN201810717932.6A CN108736495A (en) | 2018-07-03 | 2018-07-03 | A kind of novel phase-change switch device |
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| CN110445155B (en) * | 2019-08-09 | 2021-05-07 | 山东大学 | Intelligent phase change switch, system and method and electronic equipment |
| CN110867877A (en) * | 2019-12-09 | 2020-03-06 | 国网上海市电力公司 | Seamless smooth switch in load commutation process |
| CN111044893A (en) * | 2019-12-12 | 2020-04-21 | 云南电网有限责任公司临沧供电局 | System and method for measuring load response time of phase change switch |
| CN111044893B (en) * | 2019-12-12 | 2020-11-13 | 云南电网有限责任公司临沧供电局 | System and method for measuring load response time of phase change switch |
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Application publication date: 20181102 |