CN104917281B - A kind of inverter and city's electrical zero switching circuit and method - Google Patents
A kind of inverter and city's electrical zero switching circuit and method Download PDFInfo
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- CN104917281B CN104917281B CN201510293524.9A CN201510293524A CN104917281B CN 104917281 B CN104917281 B CN 104917281B CN 201510293524 A CN201510293524 A CN 201510293524A CN 104917281 B CN104917281 B CN 104917281B
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention discloses a kind of inverter and city's electrical zero switching circuit and method, for solving to be switched to load supplying in inverter and alternating current in the prior art, and when alternating current interrupts suddenly, inverter current can fall to be sent into alternating current, so that the technical problem that load supplying interrupts, zero switching circuit include：Mutually opposing first, second thyristor (11,12) in parallel, for utility grid and the load of being turned on or off；Input terminal is connected with utility grid, the pulse transformer (2) that output terminal is connected with first, second thyristor (11,12), for turning on the first thyristor (11) or the second thyristor (12) when utility grid positive half cycle or negative half period are powered respectively；Inverter power supply sub-circuit (3), for connecting simultaneously charging energy-storing or powering load with utility grid, is additionally operable to disconnect with utility grid when utility grid is powered off, powering load；Realize utility grid and be switched to the technique effect of load supplying with inverter zero.
Description
Technical field
The present invention relates to uninterrupted power supply technical field, more particularly to a kind of inverter and city's electrical zero switching circuit and side
Method.
Background technology
At present, in uninterrupted power source (UPS, Uninterruptible Power Source) and the application of microgrid, warp
It is commonly encountered inverter and utility grid is switched to load (including electrical equipment) power supply, wherein switching time is very crucial finger
Mark.Inverter power supply commonly used in the prior art and the switching circuit of utility grid power supply are as shown in Figure 1, including being connected on load
Utility grid supply line in and mutually opposing thyristor (SCR1 and SCR2) in parallel, the inverter power supply in parallel with load
Circuit (including battery and DC/AC inverters), the Single port of DC/AC inverters is connected by switching K with the one end loaded, and is led to
Cross thyristor (SCR1 and SCR2) with the firewire L of utility grid to be connected, the another port of DC/AC inverters and the other end of load
(i.e. the zero curve N of utility grid) is connected；Wherein, when inverter power supply circuit works, DC/AC inverters are by by the straight of battery
It is load supplying that galvanic electricity, which is converted to alternating current,.
Load supplying switching circuit as shown in Figure 1, to ensure its minimum switching time, relevant control method is：
Set thyristor (SCR1 and SCR2) while obtain trigger pulse and turn on so that utility grid powering load, is opened at this time
DC/AC inverters, allow inverter tracking alternating current input frequency, phase and voltage magnitude, in tracking after, closure switch K,
So that inverter power supply circuit and utility grid turn on the of short duration time jointly, touching for thyristor (SCR1 and SCR2) is then shut off
Send out pulse, then load is just powered by inverter power supply circuit；When load needs to be powered by utility grid again, then first allow inverse
Become frequency, phase and the voltage magnitude for thinking highly of new tracking alternating current input, in tracking after, open thyristor (SCR1 and SCR2)
Trigger pulse, inverter and alternating current one of short duration time of conducting jointly, be then turned off switch K, to close inverter, load just by
Utility grid is powered.
As it can be seen that in the switching circuit that existing inverter power supply and utility grid are powered, thyristor (SCR1 and SCR2)
On and off be the key that is normally carried out of switching, but thyristor closes and needs current over-zero or apply back-pressure, when alternating current is unexpected
During interruption, thyristor may be still in conducting state so that inverter current send utility grid, so as to cause load supplying
Interrupt.
That is, exist in the prior art：Load supplying is switched in inverter and utility grid, and during alternating current is unexpected
When disconnected, inverter current can fall to be sent into utility grid so that the technical problem that load supplying interrupts.
The content of the invention
The embodiment of the present application solves in the prior art by providing a kind of inverter and city's electrical zero switching circuit and method
Load supplying is switched in inverter and utility grid, and when alternating current interrupts suddenly, inverter current can fall to be sent into utility grid
In so that the technical problem that load supplying interrupts, it is load supplying to realize inverter and utility grid collaboration, in utility grid
When interrupting suddenly, utility grid and inverter power supply circuit are disconnected, prevents inverter output power from falling to be sent into utility grid, and it is inverse
Become the seamless technique effect taken over utility grid and be continuously load supplying of device power supply circuit.
In a first aspect, the embodiment of the present application provides a kind of inverter and city's electrical zero switching circuit, between to load not
Cut-off electricity, zero switching circuit include：
It is series in the connection circuit of utility grid and the load, and mutually opposing first thyristor and second in parallel
Thyristor, for being turned on when the utility grid is powered, to connect the utility grid and the load so that the alternating current
Power grid is the load supplying, and for disconnecting the utility grid and the load when the utility grid powers off；
Input terminal is connected with the zero curve and firewire of the utility grid, output terminal and first thyristor and described second
The pulse transformer that thyristor is connected, is just touched for being provided when the utility grid positive half cycle is powered to first thyristor
Pulse is sent out, so that first turn on thyristors, and when the utility grid negative half period is powered to second thyristor
Positive triggering pulse is provided, so that second turn on thyristors；
The inverter power supply sub-circuit being connected between the both ends of the load, for being connected at the both ends with the load
Afterwards, when and the utility grid is powered, simultaneously charging energy-storing is connected with the utility grid or to the load supplying, be additionally operable to
After being connected with the both ends of the load, and while the utility grid powers off, disconnected with the utility grid, and to described
Load supplying.
Optionally, the input terminal of the pulse transformer includes：The first input end that is connected with the firewire and with institute
State the second input terminal of zero curve connection；
Zero switching circuit further includes：First be connected on the connecting line of the first input end and the firewire
Switch, for being closed when the utility grid is powered, so that the pulse transformer energization work, in the utility grid just
Positive triggering pulse is provided to first thyristor when half cycle is powered, when the utility grid negative half period is powered to described second
Thyristor provides positive triggering pulse.
Optionally, the pulse transformer includes：Iron core, is wrapped in primary coil on the iron core, the first secondary wire
Circle and second subprime coil；
The primary coil includes the first input end and second input terminal；The first secondary coil bag
Include the first lead-out terminal being connected with first thyristor and second thyristor and the second lead-out terminal；Described second
Level coil includes the 3rd lead-out terminal and the 4th lead-out terminal being connected with first thyristor and second thyristor；
Wherein, when the utility grid positive half cycle is powered, second lead-out terminal and the 3rd lead-out terminal obtain
Positive output is obtained, so that first thyristor bears positive voltage, and obtains positive triggering pulse；Supplied in the utility grid negative half period
When electric, the first lead-out terminal and the 4th lead-out terminal obtain positive output, so that second thyristor bears positive electricity
Pressure, and obtain positive triggering pulse.
Optionally, the inverter power supply sub-circuit includes：Battery, and be connected and be connected to the battery plus-negative plate
Inverter between the both ends of the load；
The inverter is used for after being connected with the both ends of the load, and during utility grid energization, by the city
The AC conversion of power grid is direct current, so as to the battery charging energy-storing or the direct current of the battery is converted to exchange
Electricity, with to the load supplying；The inverter is additionally operable to after being connected with the both ends of the load, and in the utility grid
While power-off, disconnected with the utility grid, and the direct current of the battery is converted into exchange and supplies electricity to the load supplying.
Optionally, zero switching circuit further includes：The be connected on the connecting line of the inverter and the load
Two switches, for being closed in inverter tracking after the frequency of the utility grid input, phase and voltage magnitude, so that
The inverter is connected with the load, and sends when to the load supplying harmonic current needed for the load and idle
Electric current so that the utility grid provides watt current to the load.
Second aspect, the embodiment of the present application additionally provides a kind of inverter and city's electrical zero switching method, applied to such as above-mentioned
In inverter and city's electrical zero switching circuit described in first aspect, zero switching method includes step：
S1, be powered when utility grid, and needs by the utility grid when being load supplying, to connect the utility grid
And pulse transformer, to provide positive triggering pulse to the first thyristor when the utility grid positive half cycle is powered, make described the
One turn on thyristors, and positive triggering pulse is provided to the second thyristor when the utility grid negative half period is powered, make described
Second turn on thyristors, and then turn on the utility grid and the load so that it is described to be supported on the utility grid power supply
During obtain complete power supply sine wave；
S2, control open the inverter of inverter power supply sub-circuit so that the inverter track the utility grid to
Frequency, phase and the voltage magnitude of the power supply signal of the load input；
S3, the utility grid in inverter tracking, and when obtaining the frequency, phase and voltage magnitude, even
Lead to the inverter and the load；
S4, when the utility grid powers off, turn off first thyristor and second thyristor so that described inverse
Become device power supply sub-circuit to disconnect with the utility grid, while the load is continued as by the inverter power supply sub-circuit and is supplied
Electricity.
Optionally, after the step S3, and before the step S4, zero switching method further includes step：
S5, after the inverter is connected with the load, by the inverter by the alternating current of the utility grid
Direct current is converted to, so that the battery charging energy-storing of the inverter power supply sub-circuit.
Optionally, after the step S3, and before the step S4, zero switching method further includes step：
S6, after the inverter connect with the load, pass through the utility grid and inverter power supply be electric
The load supplying is given on road jointly；
Harmonic current from the control inverter to the load offer load and reactive current needed for S7, so that
The utility grid inputs watt current to the load.
The one or more technical solutions provided in the embodiment of the present application, have at least the following technical effects or advantages：
Since in the embodiment of the present application, inverter and city's electrical zero switching circuit include：It is series at utility grid and load
Connection circuit in and mutually opposing first thyristor and the second thyristor in parallel, the zero of input terminal and the utility grid
The pulse transformer that line and firewire are connected and output terminal is connected with first thyristor and second thyristor, and connection
Inverter power supply sub-circuit between the both ends of the load.Wherein, the first thyristor and the second thyristor are used for described
Utility grid turns on when being powered, to connect utility grid and load so that and utility grid is load supplying, and in alternating current
Utility grid and the load are disconnected during grid cut-off；Pulse transformer is used for brilliant to first when utility grid positive half cycle is powered
Brake tube provides positive triggering pulse, so that the first turn on thyristors, and when utility grid negative half period is powered to the second thyristor
Positive triggering pulse is provided, so that the second turn on thyristors, and then turn on utility grid and load so that state and be supported on utility grid
Complete power supply sine wave is obtained during power supply；Inverter power supply sub-circuit is used for after being turned at the both ends with load, and
When utility grid is powered, simultaneously charging energy-storing or powering load are connected with utility grid, is additionally operable to turn at the both ends with load
Afterwards, and while utility grid powers off disconnected with utility grid, and powering load.That is, pass through inverter power supply
Circuit and utility grid collaboration are load supplying, when utility grid is interrupted suddenly, disconnect utility grid and inverter power supply electricity
Road, seamless utility grid of taking over are continuously load supplying, efficiently solve and cut in the prior art in inverter and utility grid
Load supplying is changed to, and when alternating current interrupts suddenly, inverter current can fall to be sent into utility grid so that what load supplying interrupted
Technical problem, realizes when utility grid powers off suddenly, prevents inverter output power from falling to be sent into utility grid, and inverter
It is continuously the technique effect of load supplying.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of inverter and city's electrical switching circuit schematic diagram that background technology provides；
Fig. 2 is the first inverter provided by the embodiments of the present application and city's electrical zero switching circuit structure chart；
Fig. 3 is second of inverter provided by the embodiments of the present application and city's electrical zero switching circuit structure chart；
Fig. 4 is the first inverter provided by the embodiments of the present application and city's electrical zero switching method flow chart；
Fig. 5 is second of inverter provided by the embodiments of the present application and city's electrical zero switching method flow chart；
Fig. 6 is the third inverter provided by the embodiments of the present application and city's electrical zero switching method flow chart.
Embodiment
The embodiment of the present application is solved in the prior art in inversion by providing a kind of inverter and city's electrical zero switching circuit
Device and utility grid are switched to load supplying, and when alternating current interrupts suddenly, inverter current can fall to be sent into utility grid so that
The technical problem that load supplying interrupts, it is load supplying to realize inverter and utility grid collaboration, in utility grid is unexpected
When disconnected, utility grid and inverter power supply circuit are disconnected, prevents inverter output power from falling to be sent into utility grid, and inverter supplies
Circuit is seamless to take over the technique effect that utility grid is continuously load supplying.
The technical solution of the embodiment of the present application is in order to solve the above technical problems, general thought is as follows：
The embodiment of the present application provides a kind of inverter and city's electrical zero switching circuit, for for load uninterrupted power supply, institute
Stating zero switching circuit includes：It is series in the connection circuit of utility grid and the load, and mutually opposing first crystalline substance in parallel
Brake tube and the second thyristor, for being turned on when the utility grid is powered, to connect the utility grid and the load, make
It is the load supplying to obtain the utility grid, and for disconnecting the utility grid and institute when the utility grid powers off
State load；Input terminal is connected with the zero curve and firewire of the utility grid, output terminal and first thyristor and described second
The pulse transformer that thyristor is connected, is just touched for being provided when the utility grid positive half cycle is powered to first thyristor
Pulse is sent out, so that first turn on thyristors, and when the utility grid negative half period is powered to second thyristor
Positive triggering pulse is provided, so that second turn on thyristors；Inverter power supply being connected between the both ends of the load
Circuit, for after being connected with the both ends of the load, and when the utility grid is powered, connects and fills with the utility grid
Electric energy storage or to the load supplying, is additionally operable to after being connected with the both ends of the load, and in utility grid power-off
Meanwhile disconnected with the utility grid, and give the load supplying.
As it can be seen that it is load supplying by inverter power supply circuit and utility grid collaboration, in city in the embodiment of the present application
When power grid interrupts suddenly, disconnect utility grid and inverter power supply circuit, seamless utility grid of taking over be continuously load supplying,
Efficiently solve and be switched to load supplying in inverter and utility grid in the prior art, and when alternating current interrupts suddenly, inversion
Device electric current can fall to be sent into utility grid so that the technical problem that load supplying interrupts, realizes and powered off suddenly in utility grid
When, prevent inverter output power from falling to be sent into utility grid, and inverter is continuously the technique effect of load supplying.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
State technical solution to be described in detail, it should be understood that the specific features in the embodiment of the present application and embodiment are to the application
The detailed description of technical solution, rather than the restriction to technical scheme, in the case where there is no conflict, the application are implemented
Technical characteristic in example and embodiment can be mutually combined.
Embodiment one
Please refer to Fig.2, the embodiment of the present application provides a kind of inverter and city's electrical zero switching circuit, between to load not
Cut-off electricity, zero switching circuit include：
It is series in the connection circuit of utility grid and the load, and mutually opposing first thyristor 11 in parallel and
Two thyristors 12, for being turned on when the utility grid is powered, to connect the utility grid and the load so that described
Utility grid is the load supplying, and for disconnecting the utility grid and described negative when the utility grid powers off
Carry；
Input terminal is connected with the zero curve N and firewire L of the utility grid, output terminal and the first thyristor 11 and the second brilliant lock
The connected pulse transformer 2 of pipe 12, for providing positive triggering to the first thyristor 11 when the utility grid positive half cycle is powered
Pulse, so that the first thyristor 11 turns on, and provides just when the utility grid negative half period is powered to the second thyristor 12
Trigger pulse, so that the second thyristor 12 turns on；
The inverter power supply sub-circuit 3 being connected between the both ends of the load, for connecting with the both ends of the load
After logical, and during utility grid energization, simultaneously charging energy-storing connected with the utility grid or to the load supplying, be additionally operable to
After being connected with the both ends of the load, and while the utility grid powers off, disconnected with the utility grid, and give institute
State load supplying.
Specifically, please referring to Fig.3, the input terminal of pulse transformer 2 includes：The first input end 21 being connected with firewire L
The second input terminal 22 being connected with zero curve N；
Zero switching circuit further includes：The first switch being connected on the connecting line of first input end 21 and firewire L
4, for being closed when the utility grid is powered, so that 2 energization work of pulse transformer, supplies in the utility grid positive half cycle
Positive triggering pulse is provided to the first thyristor 11 when electric, is provided when the utility grid negative half period is powered to the second thyristor 12
Positive triggering pulse.
Referring still to Fig. 3, in a kind of embodiment of this programme, pulse transformer 2 includes：Iron core 23, winding
Primary coil 24, the first secondary coil 25 and second subprime coil 26 on iron core 23；Primary coil 24 includes the first input
21 and second input terminal 22 of terminal；First secondary coil 25 includes the be connected with the first thyristor 11 and the second thyristor 12
One lead-out terminal 251 and the second lead-out terminal 252；Second subprime coil 26 includes and the first thyristor 11 and the second thyristor 12
The 3rd lead-out terminal 261 and the 4th lead-out terminal 262 of connection；Wherein, 21 and second lead-out terminal 252 of first input end and
3rd lead-out terminal 261 is Same Name of Ends, and the second input terminal 22 and 251 and the 4th lead-out terminal 262 of first lead-out terminal are same
Name end；The operation principle of pulse transformer 2 is that the power grid sine voltage of input is become using the magnetic coupling performance of iron core 23
Synchronous similar sinusoidal triggering waveform, for when the utility grid positive half cycle is powered, the second lead-out terminal 252 and the
Three lead-out terminals 261 obtain positive output, so that the first thyristor 11 bears positive voltage, and obtain positive triggering pulse, and in institute
When stating the power supply of utility grid negative half period, 251 and the 4th lead-out terminal 262 of first lead-out terminal obtains positive output, so that second is brilliant
Brake tube 12 bears positive voltage, and obtains positive triggering pulse.
Pulse transformer 2 and the connection relation of the first thyristor 11 and the second thyristor 12 shown in Fig. 3 are：Second brilliant lock
The cathode of pipe 12 is connected with firewire L, and the anode of the second thyristor 12 is connected with load, is also defeated with the 4th of second subprime coil 26
Go out terminal 262 to be connected, the control pole of the second thyristor 12 passes sequentially through resistance R1 and diode D1 and the first secondary coil 25
First lead-out terminal 251 is connected, is also connected by resistance R3 with the second lead-out terminal 252 of the first secondary coil 25；First is brilliant
The anode of brake tube 11 is connected with the cathode of the second thyristor 12, is also connected with the second lead-out terminal 252；The moon of first thyristor 11
Pole is connected with the anode of the second thyristor 12, and the control pole of the first thyristor 11 passes sequentially through resistance R2 and diode D2 and second
3rd lead-out terminal 261 of secondary coil 26 is connected, also by the 4th lead-out terminal 262 of resistance R4 and second subprime coil 26
It is connected.
Referring still to Fig. 3, in same embodiment, inverter power supply sub-circuit 3 includes：Battery 31, Yi Jiyu
31 positive and negative anodes of battery be connected and be connected to the inverter 32 between the both ends of the load (i.e. DC/AC, DC-AC conversion
Device)；Inverter 32 is used for after being connected with the both ends of the load, and during utility grid energization, by the utility grid
AC conversion be direct current, so as to 31 charging energy-storing of battery or the direct current of battery 31 is converted to alternating current, with to institute
State load supplying；Inverter 32 is additionally operable to after being connected with the both ends of the load, and while the utility grid powers off,
Disconnected with the utility grid, and the direct current of battery 31 is converted into exchange and supplies electricity to the load supplying.Further, in order to
Enough neatly control inverters 32 are connected with the power grid current supply circuit of the load, and zero switching circuit further includes：It is connected on
Inverter 32 and the second switch 5 on the connecting line of the load, for the utility grid input in the tracking of inverter 32
Frequency, close after phase and voltage magnitude so that inverter 32 is connected with the load, and sent out when to the load supplying
Go out the harmonic current and reactive current needed for the load so that the utility grid provides watt current to the load
The operation principle of specific embodiment shown in Fig. 3 is：When utility grid energization, and need by the utility grid
For load supplying when, control first switch 4 close, the utility grid output voltage be in the positive half cycle of sine wave when,
First thyristor 11 bears positive voltage, and 21 and second input terminal 22 of first input end of pulse transformer 2 obtains voltage, and
First input end 21 is positive voltage, the second input terminal 22 is negative voltage, defeated in the Same Name of Ends the 3rd of first input end 21
Go out 261 and second output terminal of terminal and obtain positive output 252, the first thyristor 11 bears positive voltage, and obtains positive triggering pulse
It is and open-minded；When the voltage of utility grid output is in the negative half period of sine wave, the second thyristor 12 bears positive voltage, arteries and veins
Rush the second input terminal 22 of transformer 2 and first input end 21 obtain voltage, and the second input terminal 22 is positive voltage, the
One input terminal 21 is negative voltage, in 251 and the 4th lead-out terminal 262 of Same Name of Ends first lead-out terminal of the second input terminal 22
Positive output is obtained, the second thyristor 12 bears positive voltage, and obtains positive triggering pulse and open-minded；The final load can obtain
Whole sine voltage.Further, in order to avoid that can only control open-minded due to thyristor, its shut-off can only wait until the electricity that flows through
Flow through zero or apply the defects of back-pressure can just close thyristor, cause to accomplish zero switching to it, coordinate and supplied with inverter
Electronic circuit 3 is together the load supplying, specifically, in the utility grid normal power supply, opens inverter 32, allows inverse
Become device 32 and track frequency from the utility grid to the power supply signal of the load input, phase and voltage magnitude, described inverse
When becoming the upper utility grid of the tracking of device 32, and obtaining the frequency, phase and voltage magnitude, second switch 5 is closed, allows inversion
Device 32 and the utility grid give the load supplying, the harmonic current that the load that control inverter 32 provides needs jointly
And reactive current so that the utility grid only need to it is described load input watt current, so flow through the first thyristor 11 or
The electric current of the second thyristor 12 just input voltage same-phase with the load, therefore under any circumstance, when alternating current electricity
During net input power-off, flow through the electric current of the first thyristor 11 and the second thyristor 12 just immediately zero passage and turn off so that anti-non-return
The output power for becoming device 32 falls to be sent into power grid, and then avoids load supplying interruption, realizes the utility grid and inverse
Become device 32 zero can be switched to the load supplying under any circumstance.
Certainly,, can also be by inverter 32 by institute after inverter 32 is connected with the load in specific implementation process
The alternating current for stating utility grid is converted to direct current, to charge for the battery 31 of inverter power supply sub-circuit 3.
It should be noted that it is to drive the first thyristor 11 and second using pulse transformer 2 in the embodiment of the present application
Thyristor 12 provides just to the first thyristor 11 or the second thyristor 12 respectively when utility grid positive half cycle or negative half period are powered
Trigger pulse, so that the first thyristor 11 or the second thyristor 12 turn on, and when the utility grid is inputted and powered off, positive touches
Hair pulse is automatically stopped.In other embodiments, also main electricity using high-frequency impulse form, can found accurately by electronic circuit
The zero crossing on road sends out trigger pulse to thyristor, realizes the function of accurately opening as starting point.
To sum up, be load supplying by inverter power supply circuit and utility grid collaboration in the embodiment of the present application,
When utility grid is interrupted suddenly, disconnect utility grid and inverter power supply circuit, seamless utility grid of taking over are continuously load
Power supply, efficiently solves and is switched to load supplying in inverter and utility grid in the prior art, and when alternating current interrupts suddenly,
Inverter current can fall to be sent into utility grid so that the technical problem that load supplying interrupts, realizes unexpected in utility grid
During power-off, prevent inverter output power from falling to be sent into utility grid, and inverter is continuously the technique effect of load supplying.Together
When, the alternating current of utility grid can be also converted to direct current and charged for battery by inverter, to do standard for later stage powering load
It is standby.
Embodiment two
Please refer to Fig.4, based on same inventive concept, the embodiment of the present application additionally provides a kind of inverter and the switching of city's electrical zero
Method, applied in the inverter as described in above-described embodiment one and city's electrical zero switching circuit, zero switching method includes step
Suddenly：
S1, be powered when utility grid, and needs by the utility grid when being load supplying, to connect the utility grid
With pulse transformer 2, to provide positive triggering pulse to the first thyristor 11 when the utility grid positive half cycle is powered, make described
First thyristor 11 turns on, and provides positive triggering pulse to the second thyristor 12 when the utility grid negative half period is powered,
Second thyristor 12 is turned on, and then turns on the utility grid and the load so that is described to be supported on the alternating current
Power grid obtains complete power supply sine wave during powering；
S2, control open the inverter 32 of inverter power supply sub-circuit 3, so that the inverter 32 tracks the alternating current electricity
Frequency, phase and voltage magnitude of the net to the power supply signal of the load input；
S3, the utility grid in the inverter 32 tracking, and when obtaining the frequency, phase and voltage magnitude,
Connect the inverter 32 and the load；
S4, when the utility grid powers off, turn off first thyristor 11 and second thyristor 12 so that institute
State inverter power supply sub-circuit 3 and the utility grid to disconnect, while continued as by the inverter power supply sub-circuit 3 described
Load supplying.
In a kind of embodiment, after the step S3, and before the step S4, zero switching method
Further include step：
S5, after the inverter 32 is connected with the load, by the inverter 32 by the friendship of the utility grid
Galvanic electricity is converted to direct current, so that 31 charging energy-storing of battery of the inverter power supply sub-circuit 3.
In another embodiment, after the step S3, and before the step S4, the zero switching side
Method further includes step：
S6, after the inverter 32 connect with the load, it is sub to pass through the utility grid and the inverter power supply
Circuit 3 gives the load supplying jointly；
Harmonic current from the control inverter 32 to the load offer load and reactive current needed for S7, with
Make the utility grid to the load input watt current.
As described above, above-mentioned inverter and city's electrical zero switching method are applied to above-mentioned inverter and city's electrical zero switches
In circuit, so, one or more embodiments of this method are consistent with one or more embodiments of the system, herein just no longer
Repeat one by one.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make these embodiments other change and modification.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and scope.In this way, if these modifications and changes of the present invention belongs to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these modification and variations.
Claims (7)
1. a kind of inverter and city's electrical zero switching circuit, for load uninterrupted power supply, it is characterised in that the zero switching electricity
Road includes：
It is series in the connection circuit of utility grid and the load, and mutually opposing first thyristor (11) and second in parallel
Thyristor (12), for being turned on when the utility grid is powered, to connect the utility grid and the load so that described
Utility grid is the load supplying, and for disconnecting the utility grid and described negative when the utility grid powers off
Carry；
Input terminal is connected with the zero curve and firewire of the utility grid, output terminal and first thyristor (11) and described second
The connected pulse transformer (2) of thyristor (12), for when the utility grid positive half cycle is powered to first thyristor
(11) positive triggering pulse is provided, so that first thyristor (11) turns on, and when the utility grid negative half period is powered
Positive triggering pulse is provided to second thyristor (12), so that second thyristor (12) turns on；
The inverter power supply sub-circuit (3) being connected between the both ends of the load, for being connected at the both ends with the load
Afterwards, when and the utility grid is powered, simultaneously charging energy-storing is connected with the utility grid or to the load supplying, be additionally operable to
After being connected with the both ends of the load, and while the utility grid powers off, disconnected with the utility grid, and to described
Load supplying；
The input terminal of the pulse transformer (2) includes：The first input end (21) that is connected with the firewire and with described zero
The second input terminal (22) of line connection；The pulse transformer (2) includes：Iron core (23), is wrapped on the iron core (23)
Primary coil (24), the first secondary coil (25) and second subprime coil (26)；
The primary coil (24) includes the first input end (21) and second input terminal (22)；The first time
Level coil (25) includes the first lead-out terminal (251) being connected with first thyristor (11) and second thyristor (12)
With the second lead-out terminal (252)；The second subprime coil (26) includes and first thyristor (11) and second crystalline substance
The 3rd lead-out terminal (261) and the 4th lead-out terminal (262) of brake tube (12) connection；
Wherein, when the utility grid positive half cycle is powered, second lead-out terminal (252) and the 3rd lead-out terminal
(261) positive output is obtained, so that first thyristor (11) bears positive voltage, and obtains positive triggering pulse；In the alternating current
When power grid negative half period is powered, the first lead-out terminal (251) and the 4th lead-out terminal (262) obtain positive output, so that
Second thyristor (12) bears positive voltage, and obtains positive triggering pulse.
2. inverter as claimed in claim 1 and city's electrical zero switching circuit, it is characterised in that zero switching circuit is also wrapped
Include：The first switch (4) being connected on the connecting line of the first input end (21) and the firewire, in the alternating current
Power grid closes when being powered, so that the pulse transformer (2) energization work, when the utility grid positive half cycle is powered to described
First thyristor (11) provides positive triggering pulse, is carried when the utility grid negative half period is powered to second thyristor (12)
For positive triggering pulse.
3. inverter as claimed in claim 1 or 2 and city's electrical zero switching circuit, it is characterised in that inverter power supply
Circuit (3) includes：Battery (31), and be connected with the battery (31) positive and negative anodes and be connected between the both ends of the load
Inverter (32)；
The inverter (32) is used for after being connected with the both ends of the load, and during utility grid energization, by the city
The AC conversion of power grid is direct current so that the battery (31) charging energy-storing or by the direct current of the battery (31) turn
Alternating current is changed to, with to the load supplying；The inverter (32) is additionally operable to after being connected with the both ends of the load, and
While the utility grid power-off, disconnected with the utility grid, and the direct current of the battery (31) is converted into exchange
Supply electricity to the load supplying.
4. inverter as claimed in claim 3 and city's electrical zero switching circuit, it is characterised in that zero switching circuit is also wrapped
Include：The inverter (32) and the second switch (5) on the connecting line of the load are connected on, in the inverter (32)
Closed in tracking after the frequency of the utility grid input, phase and voltage magnitude, so that the inverter (32) is born with described
Connection is carried, and harmonic current and reactive current needed for the load are sent when to the load supplying so that the alternating current
Power grid provides watt current to the load.
5. a kind of inverter and city's electrical zero switching method, applied to the inverter as described in any claim of above-mentioned Claims 1 to 4
In city's electrical zero switching circuit, it is characterised in that zero switching method includes step：
S1, be powered when utility grid, and needs by the utility grid when being load supplying, to connect the utility grid and arteries and veins
Transformer (2) is rushed, to provide positive triggering pulse to the first thyristor (11) when the utility grid positive half cycle is powered, is made described
First thyristor (11) turns on, and provides positive triggering arteries and veins to the second thyristor (12) when the utility grid negative half period is powered
Punching, turns on second thyristor (12), and then turns on the utility grid and the load so that it is described be supported on it is described
Utility grid obtains complete power supply sine wave during powering；
S2, control open the inverter (32) of inverter power supply sub-circuit (3), so that the inverter (32) tracks the alternating current
Frequency, phase and voltage magnitude of the power grid to the power supply signal of the load input；
S3, the utility grid in the inverter (32) tracking, and when obtaining the frequency, phase and voltage magnitude, even
Lead to the inverter (32) and the load；
S4, when the utility grid powers off, turn off first thyristor (11) and second thyristor (12) so that institute
State inverter power supply sub-circuit (3) to disconnect with the utility grid, while continued as by the inverter power supply sub-circuit (3)
The load supplying.
6. inverter as claimed in claim 5 and city's electrical zero switching method, it is characterised in that after the step S3, and
Before the step S4, zero switching method further includes step：
S5, after the inverter (32) is connected with the load, by the inverter (32) by the friendship of the utility grid
Galvanic electricity is converted to direct current, so that battery (31) charging energy-storing of the inverter power supply sub-circuit (3).
7. inverter as claimed in claim 5 and city's electrical zero switching method, it is characterised in that after the step S3, and
Before the step S4, zero switching method further includes step：
S6, after the inverter (32) connect with the load, pass through the utility grid and inverter power supply be electric
The load supplying is given on road (3) jointly；
Harmonic current from the control inverter (32) to the load offer load and reactive current needed for S7, so that
The utility grid inputs watt current to the load.
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| CN201510293524.9A CN104917281B (en) | 2015-06-01 | 2015-06-01 | A kind of inverter and city's electrical zero switching circuit and method |
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| CN201510293524.9A CN104917281B (en) | 2015-06-01 | 2015-06-01 | A kind of inverter and city's electrical zero switching circuit and method |
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| CN104917281B true CN104917281B (en) | 2018-04-20 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017094179A1 (en) * | 2015-12-04 | 2017-06-08 | 東芝三菱電機産業システム株式会社 | Power conversion system |
| EP3291411B1 (en) * | 2016-09-01 | 2019-05-08 | Maschinenfabrik Reinhausen GmbH | Method for controlling an uninterruptible power supply and installation for an uninterruptible power supply |
| CN107196631B (en) * | 2017-05-16 | 2021-03-23 | 深圳市盛弘电气股份有限公司 | System and method for forcibly turning off thyristor |
| CN107085190A (en) * | 2017-05-16 | 2017-08-22 | 沃太能源南通有限公司 | A kind of and off-network switching time test device and method |
| CN111600376A (en) * | 2020-06-09 | 2020-08-28 | 李舒 | Uninterruptible power supply device |
| CN114301272A (en) * | 2021-12-13 | 2022-04-08 | 弘正储能(上海)能源科技有限公司 | Method for improving loading capacity of energy storage inverter at load-on moment |
| CN115663989B (en) * | 2022-10-20 | 2023-04-28 | 上海山源电子科技股份有限公司 | Commercial power inversion switching control method and circuit |
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| EP0514171A1 (en) * | 1991-05-17 | 1992-11-19 | Best Power Technology, Inc. | Back-up uninterruptible power system |
| CN1754294A (en) * | 2003-02-25 | 2006-03-29 | 伊顿动力品质公司 | Uninterruptible power supplies with converter operation conditioned upon static switch communication and method of operation thereof |
| CN204794322U (en) * | 2015-06-01 | 2015-11-18 | 深圳市盛弘电气股份有限公司 | Dc -to -ac converter and municipality's electrical zero switching circuit |
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| EP0514171A1 (en) * | 1991-05-17 | 1992-11-19 | Best Power Technology, Inc. | Back-up uninterruptible power system |
| CN1754294A (en) * | 2003-02-25 | 2006-03-29 | 伊顿动力品质公司 | Uninterruptible power supplies with converter operation conditioned upon static switch communication and method of operation thereof |
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