CN104716680A - Offline uninterruptible power supply with renewable energy and control method thereof - Google Patents
Offline uninterruptible power supply with renewable energy and control method thereof Download PDFInfo
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- CN104716680A CN104716680A CN201310681455.XA CN201310681455A CN104716680A CN 104716680 A CN104716680 A CN 104716680A CN 201310681455 A CN201310681455 A CN 201310681455A CN 104716680 A CN104716680 A CN 104716680A
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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Abstract
The invention provides an offline uninterruptible power supply with renewable energy and a control method thereof. The offline uninterruptible power supply with renewable energy comprises an AC input end, an AC output end, a switch device, a chargeable and dischargeable device, a positive DC bus, a negative DC bus, a capacitor, a first DC/DC converter, a full-bridge inverter, a second DC/DC converter and a renewable energy conversion device, wherein the output end of the renewable energy conversion device is connected between the positive DC bus and the negative DC bus for converting renewable energy into electric energy and outputting the electric energy to the capacitor. The renewable energy conversion device and AC at the AC input end can charge the chargeable and dischargeable device at the same time, the chargeable and dischargeable device and the renewable energy conversion device can provide power for a load at the AC output end at the same time, and the utilization rate of energy is improved.
Description
Technical field
The present invention relates to uninterrupted power supply, be specifically related to off-line type uninterrupted power supply and the control method thereof with regenerative resource.
Background technology
Uninterrupted power supply can be powered to power consumption equipment continuously, is extensively studied and utilizes.Uninterrupted power supply can be divided into off-line type and online according to its working method, inverter in off-line type uninterrupted power supply is only when utility power failure, just start to start work and powering load, off-line type uninterrupted power supply is when civil power is normal, do not need inverter work powering load, therefore there is advantage low in energy consumption.
Along with the needs of people to the energy are increasing, to the consumption of non-renewable energy resources and the pollution of environment also increasing, therefore to regenerative resource, such as, current study hotspot is become to the utilization of solar energy and wind energy.The electrical power produced due to regenerative resource not very stable, therefore can not replace stable civil power completely, can only supplement electricity consumption as one.Utilize the scheme of solar energy to have two kinds at present, a kind of is directly charged to rechargeable battery by the electric energy that solar energy exports, and first scheme is powered to ac output end after being changed by AC/DC by the direct current that solar energy produces.In the first scheme, when needs solar energy and rechargeable battery are powered to ac output end simultaneously, the electric energy that solar energy produces needs to power to ac output end through DC/DC conversion and DC/AC conversion successively, and now the utilance of energy can be very low.In first scheme, needing to increase DC/AC inverter, thus add cost, when the electric energy that solar energy produces is abundant, easily to providing the ac input end of civil power to cause damage, reducing the utilance of energy simultaneously.The electric energy how produced in regenerative resource changes, improve the utilance of the electric energy that regenerative resource produces, also there is no corresponding solution at present.
Summary of the invention
For above-mentioned technical problem, the invention provides a kind of off-line type uninterrupted power supply with regenerative resource, comprising:
Ac input end and ac output end;
Switching device, described switching device is connected between described ac input end and ac output end;
Can charge and discharge device;
Positive direct-current bus and negative DC bus;
Electric capacity, described electric capacity is connected between described positive direct-current bus and negative DC bus;
One DC/DC converter, the input of a described DC/DC converter be connected to described can the two ends of charge and discharge device, the output of a described DC/DC converter is connected between described positive direct-current bus and negative DC bus;
Full-bridge inverter, described full-bridge inverter comprises the semiconductor switch pipe that four have anti-parallel diodes, the input of described full-bridge inverter is connected between described positive direct-current bus and negative DC bus, and the output of described full-bridge inverter is connected to described ac output end;
2nd DC/DC converter, the input of described 2nd DC/DC converter is connected between described positive direct-current bus and negative DC bus, the output of described 2nd DC/DC converter be connected to described can the two ends of charge and discharge device; And
Renewable energy transfer device, the output of described renewable energy transfer device is connected between described positive direct-current bus and negative DC bus, for converting described regenerative resource to electric energy and exporting in described electric capacity.
Preferably, described regenerative resource is solar energy, and described renewable energy transfer device comprises booster circuit.
Preferably, a described DC/DC converter is DC/DC booster converter, and described 2nd DC/DC converter is DC/DC buck converter.
Preferably, when described 2nd DC/DC converter comprises half-bridge inverter, described electric capacity comprises the first electric capacity and the second electric capacity, and described first electric capacity and the second electric capacity are as a part for described half-bridge inverter.
Present invention also offers for the above-mentioned control method with the off-line type uninterrupted power supply of regenerative resource, when described ac input end has alternating current input, and the electrical power that described regenerative resource produces is when being greater than the electrical power needed for load of described ac output end, described switching device is disconnected, the electric energy described regenerative resource produced is powered to described ac output end, can charge by charge and discharge device to described simultaneously.
When described ac input end has alternating current input, and the electrical power that described regenerative resource produces be less than described can the charge and discharge device maximum electric power required when charging time, make described switching means into conduction, the alternating current of described alternating current input is powered to described ac output end, and the electric energy that the alternating current of described ac input end and described regenerative resource produce can charge by charge and discharge device to described simultaneously, wherein said full-bridge inverter is used to the power factor improving described alternating current.
When described ac input end has alternating current input, and described regenerative resource is not when producing electrical power, make described switching means into conduction, the alternating current of described ac input end is powered to described ac output end, and can charge by charge and discharge device to described, wherein said full-bridge inverter is used to the power factor improving described alternating current.
Preferably, described full-bridge inverter comprises the first semiconductor switch pipe with anti-parallel diodes, there is the second semiconductor switch pipe of anti-parallel diodes, there is the 3rd semiconductor switch pipe of anti-parallel diodes, there is the 4th semiconductor switch pipe of anti-parallel diodes, inverter inductor and inverter electric capacity, be connected between described positive direct-current bus and negative DC bus after described first semiconductor switch pipe and the series connection of the second semiconductor switch pipe, be connected between described positive direct-current bus and negative DC bus after described 3rd semiconductor switch pipe and the series connection of the 4th semiconductor switch pipe, one end of described inverter inductor is connected on the node of described first semiconductor switch pipe and the second semiconductor switch pipe, the other end of described inverter inductor is connected with one end of described inverter electric capacity, the other end of described inverter electric capacity is connected on the node of described 3rd semiconductor switch pipe and the 4th semiconductor switch pipe, described inverter electric capacity is electrically connected with described ac output end as the output of described full-bridge inverter, control described first semiconductor switch pipe and the cut-off of the second semiconductor switch pipe, in the positive half period of described alternating current, control described 3rd semiconductor switch pipe with pulse width modulation mode work and make described 4th semiconductor switch pipe cut-off, in the negative half-cycle of described alternating current, control described 3rd semiconductor switch pipe cut-off and make described 4th semiconductor switch pipe with pulse width modulation mode work.
When described ac input end does not have alternating current input, and the electrical power that described regenerative resource produces is when being greater than the electrical power needed for load of described ac output end, the electric energy described regenerative resource produced is powered to described ac output end, can charge by charge and discharge device to described simultaneously.
When described ac input end does not have alternating current input, and the electrical power that described regenerative resource produces is when being less than the electrical power needed for load of described ac output end, the electric energy that described regenerative resource is produced is powered to described ac output end, makes described can electric discharge and power to described ac output end by charge and discharge device simultaneously.
When described ac input end does not have alternating current input, and when described regenerative resource does not produce electrical power, make described can electric discharge and described ac output end is powered by charge and discharge device.
The present invention can realize controlling separately renewable energy transfer device and uninterrupted power supply, make control method simple, by the alternating current of ac input end and solar energy simultaneously to charging by charge and discharge device, can also realize by solar energy and can ac output end be powered by charge and discharge device simultaneously, improve the utilance of energy simultaneously.
Accompanying drawing explanation
Referring to accompanying drawing, embodiments of the present invention is further illustrated, wherein:
Fig. 1 is the block diagram with the off-line type uninterrupted power supply of regenerative resource of the present invention.
Fig. 2 is the circuit diagram with the off-line type uninterrupted power supply of regenerative resource of present pre-ferred embodiments.
Fig. 3 is the equivalent circuit diagram with the first working method of the off-line type uninterrupted power supply of regenerative resource shown in Fig. 2.
Fig. 4 is the equivalent circuit diagram with the second working method of the off-line type uninterrupted power supply of regenerative resource shown in Fig. 2.
Fig. 5 is the equivalent circuit diagram with the third working method of the off-line type uninterrupted power supply of regenerative resource shown in Fig. 2.
Fig. 6 is the equivalent circuit diagram with the 4th kind of working method of the off-line type uninterrupted power supply of regenerative resource shown in Fig. 2.
Fig. 7 is the equivalent circuit diagram with the 5th kind of working method of the off-line type uninterrupted power supply of regenerative resource shown in Fig. 2.
Fig. 8 is the equivalent circuit diagram with the 6th kind of working method of the off-line type uninterrupted power supply of regenerative resource shown in Fig. 2.
Main device symbol description
1 push-pull circuit
2 full-bridge inverters
3 DC/DC buck converters
4 booster circuits
5 positive direct-current buses
6 negative DC buss
7 cables
8 cables
9 circuit of power factor correction
20 can charge and discharge device
21 the one DC/DC converters
22 full-bridge inverters
23 the 2nd DC/DC converters
24 renewable energy transfer devices
30 ac input ends
40 ac output ends
B can charge-discharge battery
L1-L4 inductance
D1-D11 diode
S1, S6-S9 metal-oxide half field effect transistor
S2-S5 insulated gate bipolar transistor
Tr1, Tr2 transformer
C electric capacity
C1-C4 electric capacity
S switching device
RLY1, RLY2 relay
Embodiment
In order to make object of the present invention, technical scheme and advantage are clearly understood, below in conjunction with accompanying drawing, by specific embodiment, the present invention is described in more detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 is the block diagram with the off-line type uninterrupted power supply of regenerative resource of the present invention.As shown in Figure 1, uninterrupted power supply comprises ac input end 30 and ac output end 40, there is between ac input end 30 and ac output end 40 cable 7 and cable 8, between ac input end 30 and ac output end 40, be provided with switching device S, uninterrupted power supply also comprise positive direct-current bus 5, negative DC bus 6, can charge and discharge device 20, DC/DC converter 21, electric capacity C, full-bridge inverter 22 and DC/DC converter 23.The input of DC/DC converter 21 is connected to can the two ends of charge and discharge device 20, the output of DC/DC converter 21 is connected between positive direct-current bus 5 and negative DC bus 6, electric capacity C two ends are connected between positive direct-current bus 5 and negative DC bus 6, the input of full-bridge inverter 22 is connected between positive direct-current bus 5 and negative DC bus 6, the output of full-bridge inverter 22 is connected on ac output end 40, the input of DC/DC converter 23 is connected between positive direct-current bus 5 and negative DC bus 6, the output of DC/DC converter 23 is connected to can the two ends of charge and discharge device 20.The off-line type uninterrupted power supply with regenerative resource of the present invention also comprises renewable energy transfer device 24, and its output is connected between positive direct-current bus 5 and negative DC bus 6, and the electric energy for regenerative resource being produced exports electric capacity C to.
When electrical power needed for the load that the electric energy that renewable energy transfer device 24 produces is greater than ac output end 40, switching device S is disconnected, the electric energy that regenerative resource produces is powered to ac output end 40, simultaneously to charging by charge and discharge device 20.
When ac input end 30 has alternating current input, and the electrical power that regenerative resource produces be less than can charge and discharge device when charging during required maximum electric power, make switching device S conducting, the electric energy alternating current of ac input end 30 and regenerative resource produced is simultaneously to charging by charge and discharge device 20.
When ac input end 30 does not have alternating current input, and the electrical power that regenerative resource produces is when being greater than the electrical power needed for load of ac output end 40, the electric energy that regenerative resource produces is powered to ac output end 40, simultaneously to charging by charge and discharge device 20.
When ac input end 30 does not have alternating current input, and the electrical power that regenerative resource produces is when being less than the electrical power needed for load of ac output end 40, the electric energy that regenerative resource is produced is powered to ac output end 40, makes to discharge and power to ac output end 40 by charge and discharge device 20 simultaneously.
Those skilled in the art is known, can charge and discharge device 20, DC/DC converter 21, DC/DC converter 23 and renewable energy transfer device 24 any circuit form that can realize its function known in the art can be adopted to realize above-mentioned mode of operation.In other examples, the cable between switching device S and ac output end 40 can also be connected with the switch for operationally making this cable be turned on or off.
Fig. 2 is the circuit diagram with the off-line type uninterrupted power supply of regenerative resource of present pre-ferred embodiments.Mainly comprising can charge-discharge battery B, push-pull circuit 1, full-bridge inverter 2, DC/DC buck converter 3 and booster circuit 4.As shown in Figure 2, push-pull circuit 1 comprises metal-oxide half field effect transistor S8, metal-oxide half field effect transistor S9, transformer Tr1, diode D2-D5, the source electrode of metal-oxide half field effect transistor S8 and the source ground of metal-oxide half field effect transistor S9, the drain electrode of metal-oxide half field effect transistor S8 is connected on one end of the primary side of transformer Tr1, the drain electrode of metal-oxide half field effect transistor S9 is connected on the other end of the primary side of transformer Tr1, the centre tap of the primary side of transformer Tr1 with can the anode of charge-discharge battery B be connected, can the minus earth of charge-discharge battery B.Diode D2-D5 forms full bridge rectifier, namely the anode of diode D2 is connected with the negative electrode of diode D3, the anode of diode D4 is connected with the negative electrode of diode D5, the negative electrode of diode D2 is connected with the negative electrode of diode D4, the anode of diode D3 is connected with the anode of diode D5, wherein diode D2 and diode D4 anode as full bridge rectifier input and be connected with the secondary side of transformer Tr1, the negative electrode of diode D2 and the anode of diode D5 as the output of full bridge rectifier, simultaneously also as the output of push-pull circuit 1.The negative electrode of diode D4 is connected with one end of inductance L 3, the other end of inductance L 3 is connected on positive direct-current bus 5, the anode of diode D5 is connected on negative DC bus 6, wherein by providing pulse-width signal to the grid of metal-oxide half field effect transistor S8 and metal-oxide half field effect transistor S9, thus realize can direct current after the direct current boosting in charge-discharge battery B and after exporting a boosting.
Full-bridge inverter 2 comprises the insulated gate bipolar transistor S2 with anti-parallel diodes D8, there is the insulated gate bipolar transistor S3 of anti-parallel diodes D9, there is the insulated gate bipolar transistor S4 of anti-parallel diodes D10, there is the insulated gate bipolar transistor S5 of anti-parallel diodes D11, inductance L 2 and electric capacity C3, the collector electrode of insulated gate bipolar transistor S2 is connected on positive direct-current bus 5, the emitter of insulated gate bipolar transistor S2 is connected with the collector electrode of insulated gate bipolar transistor S3, the emitter of insulated gate bipolar transistor S3 is connected on negative DC bus 6, the collector electrode of insulated gate bipolar transistor S4 is connected on positive direct-current bus 5, the emitter of insulated gate bipolar transistor S4 is connected with the collector electrode of insulated gate bipolar transistor S5, the emitter of insulated gate bipolar transistor S5 is connected on negative DC bus 6.One end of inductance L 2 is connected with one end of electric capacity C3, and the other end of inductance L 2 is connected on the emitter of insulated gate bipolar transistor S2, and the other end of electric capacity C3 is connected on the emitter of insulated gate bipolar transistor S4.Wherein, the input of the collector electrode of insulated gate bipolar transistor S2 and the transmitting of insulated gate bipolar transistor S3 very full-bridge inverter 2, the two ends of electric capacity C3 are the output of full-bridge inverter 2.Can by providing pulse-width signal to the base stage of insulated gate bipolar transistor S2-S5, thus realize the direct current on positive direct-current bus 5 and negative DC bus 6 being converted to alternating current and exporting.
DC/DC buck converter 3 comprises metal-oxide half field effect transistor S6, metal-oxide half field effect transistor S7, electric capacity C1, electric capacity C2, transformer Tr2, diode D6, diode D7, inductance L 4 and electric capacity C4, the drain electrode of metal-oxide half field effect transistor S6 is connected on positive direct-current bus 5, the source electrode of metal-oxide half field effect transistor S6 is connected with the drain electrode of metal-oxide half field effect transistor S7, the source electrode of metal-oxide half field effect transistor S7 is connected on negative DC bus 6, electric capacity C1 and electric capacity C2 is connected between positive direct-current bus 5 and negative DC bus 6 after connecting, and there is between electric capacity C1 and electric capacity C2 node F, electric capacity C1 is connected between positive direct-current bus 5 and node F, electric capacity C2 is connected between negative DC bus 6 and node F.One end of the primary side of transformer Tr2 is connected on the source electrode of metal-oxide half field effect transistor S6, and the other end is connected on node F.The secondary side of transformer Tr2 and diode D6, diode D7, inductance L 4 and electric capacity C4 form single-phase full-wave rectifer circuit, namely one end of the secondary side of transformer Tr2 is connected with the anode of diode D6, the other end of the secondary side of transformer Tr2 is connected with the anode of diode D7, the negative electrode of diode D6 is connected with the negative electrode of diode D7, and be connected with one end of inductance L 4, the other end of inductance L 4 is connected with one end of electric capacity, and the other end of electric capacity is connected with the centre tap of the secondary side of transformer Tr2 and ground connection.Wherein positive direct-current bus 5 and negative DC bus 6 are the input of DC/DC buck converter 3, electric capacity C4 two ends are the output of DC/DC buck converter 3, the output of DC/DC buck converter 3 is connected to can the two ends of charge-discharge battery B, by control metal-oxide half field effect transistor S6 and metal-oxide half field effect transistor S7 with pulse width modulation mode work, thus by the direct current on electric capacity C1 and electric capacity C2 after DC/DC decompression transformation to charging by charge-discharge battery B.
Booster circuit 4 comprises inductance L 1, metal-oxide half field effect transistor S1 and diode D1, one end of inductance L 1, the anode of diode D1 is connected with the drain electrode of metal-oxide half field effect transistor S1 simultaneously, the other end of inductance L 1 and the source electrode of metal-oxide half field effect transistor S1 as booster circuit 4 input and be connected with solar cell (not shown), the negative electrode of diode D1 and the source electrode of metal-oxide half field effect transistor S1 as booster circuit 4 output and be connected on positive direct-current bus 5 and negative DC bus 6, namely the negative electrode of diode D1 is connected on positive direct-current bus 5, the source electrode of metal-oxide half field effect transistor S1 is connected on negative DC bus 6.Export in electric capacity C1 and electric capacity C2 after the direct current boosting produced with pulse width modulation mode work thus by solar cell by the metal-oxide half field effect transistor S1 controlled in booster circuit 4.
The uninterrupted power supply of the present embodiment also comprises relay R LY1, RLY2, and cable 7 and cable 8, one end of cable 7 and one end of cable 8 are as ac input end 30, the other end of cable 7 and the other end of cable 8 are as ac output end 40, wherein ac input end 30 and civil power (not shown) or other can be stablized provides the AC power (not shown) of alternating current to be connected, and ac output end 40 is connected with load (not shown).Relay R LY1 is double-pole single throw, be turned on or off for making cable 7 and cable 8 simultaneously, relay R LY2 alternatively makes cable 7 conducting between relay R LY1 and ac output end 40 or cut-off, and the output of full-bridge inverter 2 is connected with ac output end 40.In the circuit diagram described in Fig. 2, electric capacity C1 and electric capacity C2 mono-aspect are as a part for DC/DC buck converter 3, in addition owing to being connected between positive direct-current bus 5 and negative DC bus 6 after electric capacity C1 and electric capacity C2 series connection, electric capacity C1 and electric capacity C2 is also as the direct current energy storage device between positive direct-current bus 5 and negative DC bus 6.
In other embodiment of the present invention, regenerative resource can be wind energy, can also comprise solar energy and wind energy simultaneously.As long as the push-pull circuit 1 in the present invention can will can carry out boosting and obtain the direct current after boosting on positive direct-current bus 5 and negative DC bus 6 by the direct current in charge-discharge battery B.As long as DC/DC buck converter 3 can realize the direct current step-down in positive direct-current bus 5 and negative DC bus 6 and to charging by charge-discharge battery B.When DC/DC buck converter 3 do not comprise be connected to electric capacity C1 between positive direct-current bus 5 and negative DC bus 6 and electric capacity C2 time, between the positive direct-current bus 5 and negative DC bus 6 of uninterrupted power supply of the present invention, also should have electric capacity.In other examples, relay R LY1 can replace with other switches that cable 7 and cable 8 can be made simultaneously to be turned on or off.In a further embodiment, relay R LY2 can replace with other switches that one of them cable between relay R LY1 and ac output end 40 can be made arbitrarily to be turned on or off.In other examples, also relay R LY2 can not be had.
The working condition with the off-line type uninterrupted power supply of regenerative resource in the present embodiment is described below in conjunction with accompanying drawing 3-8.
When ac input end 30 has alternating current input, and the electrical power that solar energy produces is when being greater than the electrical power needed for load of ac output end 40, now equivalent circuit diagram as shown in Figure 3, relay R LY1 disconnects, relay R LY2 makes the interchange cable 7 between relay R LY1 and ac output end 40 disconnect, control push-pull circuit 1 quit work, control booster circuit 4 with pulse width modulation mode work thus by solar energy produce electric energy export on electric capacity C1 and electric capacity C2.Control full-bridge inverter 2 with pulse width modulation mode work, the direct current on electric capacity C1 and electric capacity C2 is converted to alternating current, thus the load of ac output end 40 is powered.Control DC/DC buck converter 3 is with pulse width modulation mode work simultaneously, thus exports electric capacity C4 two ends to simultaneously to charging by charge-discharge battery B after the voltage at electric capacity C1 and electric capacity C2 two ends is carried out step-down.Therefore, when solar energy is enough powered to the load of ac output end 40, now disconnect ac input end 30, namely disconnect mains-supplied, the electric energy produced by solar energy is completely powered, thus saves the energy, makes the utilization of the energy reach maximum.
When ac input end 30 has alternating current input, and the electrical power that solar energy produces be less than can charge-discharge battery B when charging during required maximum electric power, now equivalent circuit diagram as shown in Figure 4, make relay R LY1 conducting, relay R LY2 makes interchange cable 7 conducting between relay R LY1 and ac output end 40.Control push-pull circuit 1 quit work, control booster circuit 4 with pulse width modulation mode work thus by solar energy produce electric energy export on electric capacity C1 and electric capacity C2.Control insulated gate bipolar transistor S2 and S3 cut-off, now diode D8, diode D9, inductance L 2, electric capacity C3, diode D10, diode D11, insulated gate bipolar transistor S4 and insulated gate bipolar transistor S5 form a circuit of power factor correction 9.In the positive half period of the alternating current of ac input end 30, control insulated gate bipolar transistor S4 with pulse width modulation mode work, control insulated gate bipolar transistor S5 cut-off simultaneously, in negative half-cycle, control insulated gate bipolar transistor S4 cut-off, control insulated gate bipolar transistor S5 with pulse width modulation mode work simultaneously, thus realize utilizing the alternating current of ac input end 30 to charge to electric capacity C1 and electric capacity C2.Now illustrate the working method of circuit of power factor correction 9, in the positive half period of alternating current, control insulated gate bipolar transistor S5 cut-off, insulated gate bipolar transistor S4 conducting is controlled in first time period, now electric current is by inductance L 2, diode D8 and insulated gate bipolar transistor S4 charges to inductance L 2, within the second time period, control insulated gate bipolar transistor S4 end, now by inductance L 2, diode D8, electric capacity C1, electric capacity C2, diode D11 and electric capacity C3 forms loop, thus inductance L 2 is discharged and electric capacity C1 and electric capacity C2 is charged, repeat first time period and the control method of the second time period of positive half period afterwards successively, thus achieve electric capacity C1 and electric capacity C2 is charged.Time in the negative half-cycle of alternating current, control insulated gate bipolar transistor S4 cut-off, in the first time period of negative half-cycle, control insulated gate bipolar transistor S5 conducting, now insulated gate bipolar transistor S5, diode D9 and inductance L 2 form loop thus charge to inductance L 2, within the second time period of negative half-cycle, control insulated gate bipolar transistor S5 cut-off, now by diode D10, electric capacity C1, electric capacity C2, diode D9, inductance L 2 and electric capacity C3 form loop, thus inductance L 2 is discharged and electric capacity C1 and electric capacity C2 is charged, repeat first time period and the control method of the second time period of negative half-cycle afterwards successively, thus achieve electric capacity C1 and electric capacity C2 is charged.While control circuit of power factor correction 9 couples of electric capacity C1 and electric capacity C2 charge, control DC/DC buck converter 3 with pulse width modulation mode work, thus by after the direct current step-down on electric capacity C1 and electric capacity C2 to charging by charge-discharge battery B.In the present embodiment, separately can be controlled booster circuit 4 and uninterrupted power supply by control device (not shown), utilize the alternating current of solar energy and ac input end 30 to charging by charge-discharge battery B simultaneously, make control method simple, improve the utilance of energy simultaneously.
When ac input end 30 has alternating current input, and when solar energy does not produce electric energy, now equivalent circuit diagram as shown in Figure 5, makes relay R LY1 conducting, and relay R LY2 makes interchange cable 7 conducting between relay R LY1 and ac output end 40.Control push-pull circuit 1 to quit work, control booster circuit 4 to quit work, control insulated gate bipolar transistor S2 and S3 cut-off, the working method controlling circuit of power factor correction 9 is identical with Fig. 4, thus the alternating current of ac input end 30 is stored on electric capacity C1 and electric capacity C2, and control DC/DC buck converter 3 is with pulse width modulation mode work, thus by after the direct current step-down on electric capacity C1 and electric capacity C2 to charging by charge-discharge battery B.By this control method ensure that simultaneously the load on ac output end 40 power consumption demand and can the charge requirement of charge-discharge battery B.
When ac input end 30 does not have alternating current to input, namely during utility power failure, and the electrical power that solar energy produces is when being greater than the electrical power needed for load of ac output end 40, now equivalent circuit diagram as shown in Figure 6, control push-pull circuit 1 quit work, control booster circuit 4 with pulse width modulation mode work thus by solar energy produce electric energy export on electric capacity C1 and electric capacity C2.Control full-bridge inverter 2 with pulse width modulation mode work, the direct current on electric capacity C1 and electric capacity C2 is converted to alternating current, thus the load of ac output end 40 is powered.Control DC/DC buck converter 3 is with pulse width modulation mode work simultaneously, thus exports electric capacity C4 two ends to, simultaneously to charging by charge-discharge battery B after the voltage at electric capacity C1 and electric capacity C2 two ends is carried out step-down.Therefore when solar energy is enough powered to the load of ac output end 40, the electric energy now produced by solar energy is completely powered, thus saves the energy, makes the utilization of the energy reach maximum.
When ac input end 30 does not have alternating current to input, namely during utility power failure, and the electrical power that solar energy produces is when being less than the electrical power needed for load of ac output end 40, now equivalent circuit diagram as shown in Figure 7, DC/DC buck converter 3 is quit work, control push-pull circuit 1 to work in pulse modulation mode, thus can export on electric capacity C1 and electric capacity C2 after the direct current boosting in charge-discharge battery B, controlling booster circuit 4 with pulse width modulation mode work exports to the electric energy that solar energy produces on electric capacity C1 and electric capacity C2.Control full-bridge inverter 2 with pulse width modulation mode work simultaneously, the direct current on electric capacity C1 and electric capacity C2 is converted to alternating current, thus the load of ac output end 40 is powered.This control method can realize charge-discharge battery B and solar energy being discharged on electric capacity C1 and electric capacity C2 simultaneously, is powered, improve the utilance of the energy by the load of full-bridge inverter 2 pairs of ac output ends 40.
When ac input end 30 does not have alternating current to input, namely during utility power failure, and solar energy is not when producing electric energy, now equivalent circuit diagram as shown in Figure 8, booster circuit 4 and DC/DC buck converter 3 are quit work, control push-pull circuit 1 with pulse width modulation mode work, thus can export on electric capacity C1 and electric capacity C2 after the direct current boosting in charge-discharge battery B, control full-bridge inverter 2 with pulse width modulation mode work simultaneously, direct current on electric capacity C1 and electric capacity C2 is converted to alternating current, thus the load of ac output end 40 is powered.
In control method of the present invention, separately to the control of booster circuit 4, push-pull circuit 1, full-bridge inverter 2 or DC/DC buck converter 3 like the prior art, do not repeat them here.
In circuit structure in the present invention, the alternating current of solar energy and ac input end can be realized simultaneously to can charge-discharge battery charge, also can realize charge-discharge battery and solar energy powering to the load of ac output end 40 simultaneously, improve the utilance of energy, circuit structure is simple simultaneously, volume is little, and cost is low.
Although the present invention is described by preferred embodiment, but the present invention is not limited to embodiment as described herein, also comprises done various change and change without departing from the present invention.
Claims (11)
1. there is an off-line type uninterrupted power supply for regenerative resource, it is characterized in that, comprising:
Ac input end and ac output end;
Switching device, described switching device is connected between described ac input end and ac output end;
Can charge and discharge device;
Positive direct-current bus and negative DC bus;
Electric capacity, described electric capacity is connected between described positive direct-current bus and negative DC bus;
One DC/DC converter, the input of a described DC/DC converter be connected to described can the two ends of charge and discharge device, the output of a described DC/DC converter is connected between described positive direct-current bus and negative DC bus;
Full-bridge inverter, described full-bridge inverter comprises the semiconductor switch pipe that four have anti-parallel diodes, the input of described full-bridge inverter is connected between described positive direct-current bus and negative DC bus, and the output of described full-bridge inverter is connected to described ac output end;
2nd DC/DC converter, the input of described 2nd DC/DC converter is connected between described positive direct-current bus and negative DC bus, the output of described 2nd DC/DC converter be connected to described can the two ends of charge and discharge device; And
Renewable energy transfer device, the output of described renewable energy transfer device is connected between described positive direct-current bus and negative DC bus, for converting described regenerative resource to electric energy and exporting in described electric capacity.
2. the off-line type uninterrupted power supply with regenerative resource according to claim 1, is characterized in that, described regenerative resource is solar energy, and described renewable energy transfer device comprises booster circuit.
3. the off-line type uninterrupted power supply with regenerative resource according to claim 1 and 2, is characterized in that, a described DC/DC converter is DC/DC booster converter, and described 2nd DC/DC converter is DC/DC buck converter.
4. the off-line type uninterrupted power supply with regenerative resource according to claim 1 and 2, it is characterized in that, when described 2nd DC/DC converter comprises half-bridge inverter, described electric capacity comprises the first electric capacity and the second electric capacity, and described first electric capacity and the second electric capacity are as a part for described half-bridge inverter.
5. one kind for the control method with the off-line type uninterrupted power supply of regenerative resource described in any one of Claims 1-4, it is characterized in that: when described ac input end has alternating current input, and the electrical power that described regenerative resource produces is when being greater than the electrical power needed for load of described ac output end, described switching device is disconnected, the electric energy described regenerative resource produced is powered to described ac output end, can charge by charge and discharge device to described simultaneously.
6. one kind for the control method with the off-line type uninterrupted power supply of regenerative resource described in any one of Claims 1-4, it is characterized in that: when described ac input end has alternating current input, and the electrical power that described regenerative resource produces be less than described can the charge and discharge device maximum electric power required when charging time, make described switching means into conduction, the alternating current of described alternating current input is powered to described ac output end, and the electric energy that the alternating current of described ac input end and described regenerative resource produce can charge by charge and discharge device to described simultaneously, wherein said full-bridge inverter is used to the power factor improving described alternating current.
7. one kind for the control method with the off-line type uninterrupted power supply of regenerative resource described in any one of Claims 1-4, it is characterized in that: when described ac input end has alternating current input, and described regenerative resource is not when producing electrical power, make described switching means into conduction, the alternating current of described alternating current input is powered to described ac output end, and the alternating current of described ac input end can charge by charge and discharge device to described, wherein said full-bridge inverter is used to the power factor improving described alternating current.
8. one kind for the control method with the off-line type uninterrupted power supply of regenerative resource described in claim 6 or 7, described full-bridge inverter comprises the first semiconductor switch pipe with anti-parallel diodes, there is the second semiconductor switch pipe of anti-parallel diodes, there is the 3rd semiconductor switch pipe of anti-parallel diodes, there is the 4th semiconductor switch pipe of anti-parallel diodes, inverter inductor and inverter electric capacity, be connected between described positive direct-current bus and negative DC bus after described first semiconductor switch pipe and the series connection of the second semiconductor switch pipe, be connected between described positive direct-current bus and negative DC bus after described 3rd semiconductor switch pipe and the series connection of the 4th semiconductor switch pipe, one end of described inverter inductor is connected on the node of described first semiconductor switch pipe and the second semiconductor switch pipe, the other end of described inverter inductor is connected with one end of described inverter electric capacity, the other end of described inverter electric capacity is connected on the node of described 3rd semiconductor switch pipe and the 4th semiconductor switch pipe, described inverter electric capacity is electrically connected with described ac output end as the output of described full-bridge inverter, it is characterized in that: control described first semiconductor switch pipe and the cut-off of the second semiconductor switch pipe, in the positive half period of described alternating current, control described 3rd semiconductor switch pipe with pulse width modulation mode work and make described 4th semiconductor switch pipe cut-off, in the negative half-cycle of described alternating current, control described 3rd semiconductor switch pipe cut-off and make described 4th semiconductor switch pipe with pulse width modulation mode work.
9. one kind about the control method with the off-line type uninterrupted power supply of regenerative resource described in any one of Claims 1-4, it is characterized in that: when described ac input end does not have alternating current input, and the electrical power that described regenerative resource produces is when being greater than the electrical power needed for load of described ac output end, the electric energy described regenerative resource produced is powered to described ac output end, can charge by charge and discharge device to described simultaneously.
10. one kind about the control method with the off-line type uninterrupted power supply of regenerative resource described in any one of Claims 1-4, it is characterized in that: when described ac input end does not have alternating current input, and the electrical power that described regenerative resource produces is when being less than the electrical power needed for load of described ac output end, the electric energy that described regenerative resource is produced is powered to described ac output end, makes described can electric discharge and power to described ac output end by charge and discharge device simultaneously.
11. 1 kinds about the control method with the off-line type uninterrupted power supply of regenerative resource described in any one of Claims 1-4, it is characterized in that: when described ac input end does not have alternating current input, and described regenerative resource is not when producing electrical power, make described can charge and discharge device electric discharge described ac output end is powered.
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