CN102082462A - Photovoltaic UPS system and control method - Google Patents

Photovoltaic UPS system and control method Download PDF

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Publication number
CN102082462A
CN102082462A CN2010106088408A CN201010608840A CN102082462A CN 102082462 A CN102082462 A CN 102082462A CN 2010106088408 A CN2010106088408 A CN 2010106088408A CN 201010608840 A CN201010608840 A CN 201010608840A CN 102082462 A CN102082462 A CN 102082462A
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circuit
charging
photovoltaic cell
network
photovoltaic
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CN102082462B (en
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于玮
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Guangdong East Power Co Ltd
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Guangdong East Power Co Ltd
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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
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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Abstract

The invention discloses a photovoltaic uninterrupted power supply (UPS) system and a control method. The system comprises a photovoltaic battery, a rectifying circuit, a storage battery, a DC/DC buck circuit connected with an alternating current power grid, a DC/DC boost circuit, a UPS inverter circuit connected with a load, a charging/discharging controller and a detection circuit, wherein the DC/DC boost circuit is connected with a photovoltaic battery; the system also comprises a switch K1, a switch K2, a switch K3 and a switch K4, wherein one end of the K1, one end of the K2 and one end of the K3 are connected with the storage battery; the other end of the K1 is connected with the DC/DC buck circuit; the other end of the K2 is connected with the DC/DC boost circuit; the other end of the K3 is connected with a UPS inverter; one end of the K4 is connected with the alternating current power grid; the other end of the K4 is connected with the rectifying circuit; the other end of the rectifying circuit is connected with the UPS inverter; and the detection circuit and the UPS inverter circuit are connected with the charging/discharging circuit controller. The system has various power supply modes, maximally utilizes solar energy and has high system efficiency.

Description

A kind of photovoltaic ups system and control method
Technical field
The present invention relates to photovoltaic inverter field, relate in particular to photovoltaic ups system and control method.
Background technology
Photovoltaic power generation technology is as a kind of emerging clean energy resource industry, and development recent years is compared with traditional energy rapidly, advantage such as have environmental protection, can reuse.Implemented photovoltaic roof electricity generation system in countries such as the U.S., Japan, Germany, France, UPS has been widely used in each occasion of industrial production and resident living as the breakpoint protective device of important load.Photovoltaic cell and UPS combined better to bring into play both advantages, realize the maximum utilization of resource.
Summary of the invention
The objective of the invention is to provides a kind of photovoltaic ups system structure at the deficiencies in the prior art, and its supply power mode is various, utilizes solar energy, system effectiveness height substantially.
Purpose of the present invention realizes by following technical measures:
A kind of photovoltaic ups system, comprise photovoltaic cell, rectification circuit, storage battery, the DC/DC reduction voltage circuit that is connected with AC network, the DC/DC booster circuit, the UPS inverter circuit that is connected with load, charging-discharging controller, testing circuit, the DC/DC booster circuit is connected with photovoltaic cell, also comprise K switch 1, K2, K3, K4, K1, K2, the end of K3 is connected with storage battery, the other end of K1 is connected with the DC/DC reduction voltage circuit, the other end of K2 is connected with the DC/DC booster circuit, the other end UPS inverter of K3 connects, the end of K4 is connected with AC network, the other end of K4 is connected with rectification circuit, the rectification circuit other end is connected testing circuit with the UPS inverter, the UPS inverter circuit is connected with charging-discharging controller.
Wherein, also comprise power factor correction circuit, power factor correction circuit one end is connected with rectification circuit, and the power factor correction circuit other end is connected with the UPS inverter.
Wherein, also be provided with second rectification circuit between DC/DC reduction voltage circuit and the AC network, second rectification circuit, one end is connected with AC network, and the second rectification circuit other end is connected with the DC/DC reduction voltage circuit.
Wherein, K switch 1, K2, K3, K4 are power switch pipe, and K1, K2, K3, K4 are connected with charging-discharging controller.
A kind of photovoltaic ups system control method comprises the steps:
A: establishing the storage battery low-voltage set point is V Bmin1, the minimum discharge voltage of storage battery is V Bmin2, battery tension is that maximum voltage is , establish DC/DC reduction voltage circuit power output and be
Figure 2010106088408100002DEST_PATH_IMAGE004
, DC/DC booster circuit power output is
Figure 2010106088408100002DEST_PATH_IMAGE006
, DC/DC booster circuit output current is
Figure 2010106088408100002DEST_PATH_IMAGE008
, DC/DC booster circuit output minimum current is , the storage battery power output is
Figure 2010106088408100002DEST_PATH_IMAGE012
, bearing power is
Figure 2010106088408100002DEST_PATH_IMAGE014
, testing circuit detects in the circuit
Figure 2010106088408100002DEST_PATH_IMAGE016
,
Figure 173652DEST_PATH_IMAGE004
,
Figure 243108DEST_PATH_IMAGE006
,
Figure 2010106088408100002DEST_PATH_IMAGE018
,
Figure 720226DEST_PATH_IMAGE012
, , and send charging-discharging controller to;
B: charging-discharging controller according to testing circuit detect,,,
Figure 2010106088408100002DEST_PATH_IMAGE020
,
Figure 228272DEST_PATH_IMAGE012
, value, calculate, judgment task state, and then the closure state of control switch K1, K2, K3, K4, when
Figure 2010106088408100002DEST_PATH_IMAGE022
The time, change step C over to, when
Figure 2010106088408100002DEST_PATH_IMAGE024
, and the time, change step D over to;
Figure 773523DEST_PATH_IMAGE024
And
Figure 2010106088408100002DEST_PATH_IMAGE026
The time, change step e over to; When ,
Figure 2010106088408100002DEST_PATH_IMAGE030
And the time, change step F over to; At that time, changed step G over to;
C: charging-discharging controller power controlling switching tube
Figure 2010106088408100002DEST_PATH_IMAGE032
,
Figure 2010106088408100002DEST_PATH_IMAGE034
Disconnect,
Figure 2010106088408100002DEST_PATH_IMAGE036
, Closure, be the photovoltaic cell state that works alone this moment, and photovoltaic cell is an electric, and photovoltaic cell charges a battery simultaneously, when
Figure 2010106088408100002DEST_PATH_IMAGE040
The time, the DC/DC booster circuit that is connected with photovoltaic cell works in the MPPT mode, and the MPPT mode is the generating voltage of charging-discharging controller detecting real-time solar panels, and follows the trail of maximum voltage value, makes system reach the highest efficient, when
Figure DEST_PATH_IMAGE042
The time, the DC/DC booster circuit that is connected with photovoltaic cell works in constant voltage charging method;
D: charging-discharging controller power controlling switching tube
Figure 685241DEST_PATH_IMAGE032
,
Figure 985641DEST_PATH_IMAGE034
Disconnect,,
Figure 910872DEST_PATH_IMAGE038
Closure, jointly be electric state for going out photovoltaic cell and storage battery this moment, photovoltaic cell and storage battery discharge simultaneously, are electric;
E: charging-discharging controller power controlling switching tube
Figure 72863DEST_PATH_IMAGE034
Disconnect,
Figure 321310DEST_PATH_IMAGE032
,
Figure 543344DEST_PATH_IMAGE036
, closure, this moment the DC/DC reduction voltage circuit that is connected with AC network so that storage battery is charged, photovoltaic cell and DC/DC reduction voltage circuit are that charge in batteries and official document are electric jointly;
F: charging-discharging controller power controlling switching tube
Figure 955871DEST_PATH_IMAGE038
Disconnect,
Figure 185469DEST_PATH_IMAGE032
Disconnect,, closure, this moment the AC network operate as normal, when
Figure DEST_PATH_IMAGE044
The time, the DC/DC booster circuit that is connected with photovoltaic cell works in the MPPT mode, and the MPPT mode is the generating voltage of charging-discharging controller detecting real-time solar panels, and follows the trail of maximum voltage value, makes system reach the highest efficient, when
Figure 491685DEST_PATH_IMAGE042
The time, the DC/DC booster circuit that is connected with photovoltaic cell works in constant voltage charging method, and the DC/DC reduction voltage circuit that is connected with AC network is closed, and photovoltaic cell is a charge in batteries, and AC network provides energy to load;
G: charging-discharging controller power controlling switching tube
Figure 681358DEST_PATH_IMAGE036
,
Figure 518864DEST_PATH_IMAGE038
Disconnect,
Figure 271925DEST_PATH_IMAGE032
, closure, AC network provides energy to load, simultaneously storage battery is charged, the DC/DC booster circuit that is connected with photovoltaic cell cuts out, the work of the DC/DC reduction voltage circuit that is connected with AC network charges a battery.
Wherein, be electric among step C, step D, step e, step F, the step G before, power factor correction circuit is corrected power factor (PF), after power factor correction circuit is corrected power factor (PF), through powering load after the inversion of UPS inverter circuit.
Wherein, before AC network was electric among step F, the step G, rectification circuit further carried out rectification to alternating current.
Wherein, among step e and the step G, the alternating current of AC network is before entering the DC/DC reduction voltage circuit, through the second rectification circuit rectification.
Beneficial effect of the present invention is: a kind of photovoltaic ups system, comprise photovoltaic cell, rectification circuit, storage battery, the DC/DC reduction voltage circuit that is connected with AC network, the DC/DC booster circuit, the UPS inverter circuit that is connected with load, charging-discharging controller, testing circuit, the DC/DC booster circuit is connected with photovoltaic cell, also comprise K switch 1, K2, K3, K4, K1, K2, the end of K3 is connected with storage battery, the other end of K1 is connected with the DC/DC reduction voltage circuit, the other end of K2 is connected with the DC/DC booster circuit, the other end UPS inverter of K3 connects, the end of K4 is connected with AC network, the other end of K4 is connected with rectification circuit, the rectification circuit other end is connected with the UPS inverter, testing circuit, the UPS inverter circuit is connected with charging-discharging controller, the present invention intelligently realizes the automatic conversion between the various different working modes of UPS, supply power mode is various, utilizes solar energy substantially, the system effectiveness height.
Description of drawings
Fig. 1 is the structured flowchart of an embodiment of photovoltaic ups system of the present invention.
Fig. 2 is mode of operation 1 or the mode of operation 2 of an embodiment of photovoltaic ups system of the present invention.
Fig. 3 is the mode of operation 3 of an embodiment of photovoltaic ups system of the present invention.
Fig. 4 is that an embodiment of photovoltaic ups system of the present invention is in AC network mode of operation 4 or mode of operation 5 just often.
Fig. 5 is that an embodiment of photovoltaic ups system of the present invention is in AC network mode of operation 6 or mode of operation 7 just often.
Fig. 6 is that an embodiment of photovoltaic ups system of the present invention is in AC network mode of operation 8 just often.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing, as Fig. 1-shown in Figure 6.
Embodiment 1
A kind of photovoltaic ups system, comprise photovoltaic cell, rectification circuit, storage battery, the DC/DC reduction voltage circuit that is connected with AC network, the DC/DC booster circuit, the UPS inverter circuit that is connected with load, charging-discharging controller, testing circuit, the DC/DC booster circuit is connected with photovoltaic cell, also comprise K switch 1, K2, K3, K4, K1, K2, the end of K3 is connected with storage battery, the other end of K1 is connected with the DC/DC reduction voltage circuit, the other end of K2 is connected with the DC/DC booster circuit, the other end UPS inverter of K3 connects, the end of K4 is connected with AC network, the other end of K4 is connected with rectification circuit, the rectification circuit other end is connected with the UPS inverter, testing circuit, the UPS inverter circuit is connected with charging-discharging controller, the present invention intelligently realizes the automatic conversion between the various different working modes of UPS, the supply power mode variation, and maximally utilising the light sun can, guaranteed the power supply quality of load and the uninterrupted power supply of important load, system effectiveness height.
Present embodiment also comprise power factor correction circuit, power factor correction circuit one end is connected with rectification circuit, the power factor correction circuit other end is connected with the UPS inverter.
Also be provided with second rectification circuit between the DC/DC reduction voltage circuit of present embodiment and the AC network, second rectification circuit, one end is connected with AC network, and the second rectification circuit other end is connected with the DC/DC reduction voltage circuit.
The K switch 1 of present embodiment, K2, K3, K4 are power switch pipe, and K1, K2, K3, K4 are connected with charging-discharging controller.
Embodiment 2
A kind of photovoltaic ups system control method comprises the steps:
A: establishing the storage battery low-voltage set point is that Vbmin1, the minimum discharge voltage of storage battery are Vbmin2, and battery tension is that maximum voltage is
Figure 511277DEST_PATH_IMAGE002
, establish DC/DC reduction voltage circuit power output and be
Figure 58802DEST_PATH_IMAGE004
, DC/DC booster circuit power output is , DC/DC booster circuit output current is
Figure 753405DEST_PATH_IMAGE008
, DC/DC booster circuit output minimum current is that the storage battery power output is
Figure 833881DEST_PATH_IMAGE012
, bearing power is , testing circuit detects in the circuit
Figure 177455DEST_PATH_IMAGE016
,
Figure 537898DEST_PATH_IMAGE004
,
Figure 486263DEST_PATH_IMAGE006
,
Figure 641169DEST_PATH_IMAGE018
,,
Figure 737301DEST_PATH_IMAGE014
, and send charging-discharging controller to;
B: charging-discharging controller detects according to testing circuit
Figure 386588DEST_PATH_IMAGE016
,
Figure 438727DEST_PATH_IMAGE004
,,,
Figure 515267DEST_PATH_IMAGE012
, value, calculate, judgment task state, and then the closure state of control switch K1, K2, K3, K4, when
Figure 288576DEST_PATH_IMAGE022
The time, change step C over to, when
Figure 475975DEST_PATH_IMAGE024
, and
Figure DEST_PATH_IMAGE046
The time, change step D over to;
Figure 648199DEST_PATH_IMAGE024
And the time, change step e over to; When,
Figure 895640DEST_PATH_IMAGE030
And The time, change step F over to; When
Figure DEST_PATH_IMAGE050
The time, change step G over to;
C: charging-discharging controller power controlling switching tube
Figure 277949DEST_PATH_IMAGE032
,
Figure 331356DEST_PATH_IMAGE034
Disconnect,
Figure 108819DEST_PATH_IMAGE036
, closure, be the photovoltaic cell state that works alone this moment, and photovoltaic cell is an electric, and photovoltaic cell charges a battery simultaneously, when
Figure 779359DEST_PATH_IMAGE040
The time, the DC/DC booster circuit that is connected with photovoltaic cell works in the MPPT mode, and the MPPT mode is the generating voltage of charging-discharging controller detecting real-time solar panels, and follows the trail of maximum voltage value, makes system reach the highest efficient, when
Figure 9483DEST_PATH_IMAGE042
The time, the DC/DC booster circuit that is connected with photovoltaic cell works in constant voltage charging method;
D: charging-discharging controller power controlling switching tube
Figure 866581DEST_PATH_IMAGE032
,
Figure 747818DEST_PATH_IMAGE034
Disconnect,, closure, jointly be electric state for going out photovoltaic cell and storage battery this moment, photovoltaic cell and storage battery discharge simultaneously, are electric;
E: charging-discharging controller power controlling switching tube
Figure 337062DEST_PATH_IMAGE034
Disconnect,
Figure 382379DEST_PATH_IMAGE032
,
Figure 964539DEST_PATH_IMAGE036
,
Figure 451015DEST_PATH_IMAGE038
Closure, the DC/DC reduction voltage circuit that be connected with AC network this moment is to charge to storage battery, and photovoltaic cell and DC/DC reduction voltage circuit are that charge in batteries and official document are electric jointly;
F: charging-discharging controller power controlling switching tube
Figure 726007DEST_PATH_IMAGE038
Disconnect,
Figure 993041DEST_PATH_IMAGE032
Disconnect,
Figure 129624DEST_PATH_IMAGE036
,
Figure 711085DEST_PATH_IMAGE034
Closure, this moment the AC network operate as normal, when
Figure 907711DEST_PATH_IMAGE044
The time, the DC/DC booster circuit that is connected with photovoltaic cell works in the MPPT mode, and the MPPT mode is the generating voltage of charging-discharging controller detecting real-time solar panels, and follows the trail of maximum voltage value, makes system reach the highest efficient, when
Figure 662041DEST_PATH_IMAGE042
The time, the DC/DC booster circuit that is connected with photovoltaic cell works in constant voltage charging method, and the DC/DC reduction voltage circuit that is connected with AC network is closed, and photovoltaic cell is a charge in batteries, and AC network provides energy to load;
G: charging-discharging controller power controlling switching tube
Figure 586003DEST_PATH_IMAGE036
,
Figure 47071DEST_PATH_IMAGE038
Disconnect,,
Figure 476916DEST_PATH_IMAGE034
Closure, AC network provides energy to load, simultaneously storage battery is charged, and the DC/DC booster circuit that is connected with photovoltaic cell cuts out, and the DC/DC reduction voltage circuit that is connected with AC network charges a battery.
Before being electric among the step C of present embodiment, step D, step e, step F, the step G, power factor correction circuit is corrected power factor (PF), after power factor correction circuit is corrected power factor (PF), through powering load after the inversion of UPS inverter circuit.
Before AC network was electric among the step F of present embodiment, the step G, rectification circuit further carried out rectification to alternating current.
The alternating current of the AC network of present embodiment is before entering the DC/DC reduction voltage circuit, through the second rectification circuit rectification.
As shown in Figure 2, the photovoltaic cell energy is not only exported to load equipment, and some is stored in the storage battery, and promptly photovoltaic cell works in the state of working alone, therefore no matter AC network normally whether, system works in the condition of this pattern is:
Figure 639913DEST_PATH_IMAGE022
, and
Figure DEST_PATH_IMAGE052
With magnitude relationship determined the DC/DC booster circuit to work in MPPT mode or constant voltage charging method.When
Figure 305249DEST_PATH_IMAGE040
The time DC/DC booster circuit work in the MPPT mode, this moment, present embodiment was in mode of operation 1, when The time DC/DC booster circuit work in constant voltage charging method, this moment, present embodiment was in mode of operation 2.This moment power switch pipe
Figure 221570DEST_PATH_IMAGE032
,
Figure 140372DEST_PATH_IMAGE034
Disconnect,
Figure 156869DEST_PATH_IMAGE036
,
Figure 841797DEST_PATH_IMAGE038
Closure, photovoltaic cell provides energy to load and charges a battery.
As shown in Figure 3, photovoltaic cell energy and storage battery energy are the load equipment power supply jointly, and therefore no matter normally whether AC network, system works in the condition of this pattern is: and, the DC/DC booster circuit works in the MPPT mode, and this moment, present embodiment was in mode of operation 3, power switch pipe
Figure 347865DEST_PATH_IMAGE032
,
Figure 501766DEST_PATH_IMAGE034
Disconnect,
Figure 571222DEST_PATH_IMAGE036
,
Figure 861389DEST_PATH_IMAGE038
Closure, photovoltaic cell and storage battery discharge simultaneously.
As shown in Figure 4, the photovoltaic cell energy shortage is to supply with load equipment, and because thereby the storage battery energy deficiency must start the DC/DC reduction voltage circuit so that storage battery is charged, this moment, present embodiment was in mode of operation 4 or mode of operation 5, so the condition that AC network just often works in this pattern is:
Figure 803937DEST_PATH_IMAGE024
And.This moment, the DC/DC reduction voltage circuit worked in the constant current charge stage, and the DC/DC booster circuit works in the MPPT mode, and photovoltaic cell and DC/DC reduction voltage circuit are that charger provides energy for charge in batteries and to load jointly.
As shown in Figure 5, photovoltaic cell energy and storage battery energy be all much smaller than load equipment institute energy requirement, so the condition that AC network just often works in this pattern is: ,
Figure 787122DEST_PATH_IMAGE030
And
Figure 449573DEST_PATH_IMAGE048
, and
Figure 235126DEST_PATH_IMAGE052
Size determined the DC/DC booster circuit to work in MPPT mode or constant voltage charging method.The DC/DC booster circuit worked in the MPPT mode at that time, and this moment, present embodiment was in mode of operation 6, when
Figure 160357DEST_PATH_IMAGE042
The time DC/DC booster circuit work in constant voltage charging method, this moment, present embodiment was in mode of operation 7.Power switch pipe disconnection this moment,
Figure 571615DEST_PATH_IMAGE032
Disconnect,
Figure 836374DEST_PATH_IMAGE036
,
Figure 307676DEST_PATH_IMAGE034
Closure, the DC/DC reduction voltage circuit is closed, and photovoltaic cell is a charge in batteries, and AC network provides energy to load.
As shown in Figure 6, the photovoltaic cell energy is zero, and start the UPS function this moment, and promptly AC network provides all required energy of system, not only supplies load equipment institute energy requirement, and storage battery is charged.Therefore AC network just often works in the condition of this pattern and is: This moment, present embodiment was in mode of operation 8 power switch pipes
Figure 420305DEST_PATH_IMAGE036
,
Figure 788839DEST_PATH_IMAGE038
Disconnect,
Figure 244091DEST_PATH_IMAGE032
, Closure, the DC/DC booster circuit cuts out.The DC/DC reduction voltage circuit works in constant voltage or constant current charge stage, and AC network provides energy for charge in batteries and to load.
Table 1 is under the AC network normal condition, and switching condition between the various mode of operations of system switches to realize the intelligence between the various states of UPS.Mainly be according to the magnitude relationship between photovoltaic cell energy, storage battery energy, the energy requirement three of load equipment institute determine system works in where mode of operation.
Table 1
Figure DEST_PATH_IMAGE054
Should be noted that at last; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although the present invention has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the essence and the scope of technical solution of the present invention.

Claims (8)

1. photovoltaic ups system, comprise photovoltaic cell, rectification circuit, storage battery, the DC/DC reduction voltage circuit that is connected with AC network, the DC/DC booster circuit, the UPS inverter circuit that is connected with load, charging-discharging controller, testing circuit, the DC/DC booster circuit is connected with photovoltaic cell, it is characterized in that: also comprise K switch 1, K2, K3, K4, K1, K2, the end of K3 is connected with storage battery, the other end of K1 is connected with the DC/DC reduction voltage circuit, the other end of K2 is connected with the DC/DC booster circuit, the other end UPS inverter of K3 connects, the end of K4 is connected with AC network, the other end of K4 is connected with rectification circuit, the rectification circuit other end is connected testing circuit with the UPS inverter, the UPS inverter circuit is connected with charging-discharging controller.
2. a kind of photovoltaic ups system according to claim 1 is characterized in that: also comprise power factor correction circuit, power factor correction circuit one end is connected with rectification circuit, and the power factor correction circuit other end is connected with the UPS inverter.
3. a kind of photovoltaic ups system according to claim 2, it is characterized in that: also be provided with second rectification circuit between DC/DC reduction voltage circuit and the AC network, second rectification circuit, one end is connected with AC network, and the second rectification circuit other end is connected with the DC/DC reduction voltage circuit.
4. a kind of photovoltaic ups system according to claim 3 is characterized in that: K switch 1, K2, K3, K4 are power switch pipe, and K1, K2, K3, K4 are connected with charging-discharging controller.
5. a photovoltaic ups system control method is characterized in that: comprise the steps:
A: establishing the storage battery low-voltage set point is V Bmin1, the minimum discharge voltage of storage battery is V Bmin2, battery tension is
Figure 2010106088408100001DEST_PATH_IMAGE002
, maximum voltage is
Figure 2010106088408100001DEST_PATH_IMAGE004
, establish DC/DC reduction voltage circuit power output and be
Figure 2010106088408100001DEST_PATH_IMAGE006
, DC/DC booster circuit power output is
Figure 2010106088408100001DEST_PATH_IMAGE008
, DC/DC booster circuit output current is that DC/DC booster circuit output minimum current is that the storage battery power output is that bearing power is that testing circuit detects in the circuit
Figure 52502DEST_PATH_IMAGE002
,
Figure 159523DEST_PATH_IMAGE006
,
Figure 876943DEST_PATH_IMAGE008
,
Figure 2010106088408100001DEST_PATH_IMAGE010
,
Figure 2010106088408100001DEST_PATH_IMAGE012
, , and send charging-discharging controller to;
B: charging-discharging controller detects according to testing circuit ,
Figure 522743DEST_PATH_IMAGE006
,,
Figure 2010106088408100001DEST_PATH_IMAGE016
,
Figure 484487DEST_PATH_IMAGE012
, value, calculate, judgment task state, and then the closure state of control switch K1, K2, K3, K4, when
Figure 2010106088408100001DEST_PATH_IMAGE018
The time, change step C over to, when
Figure 2010106088408100001DEST_PATH_IMAGE020
, and The time, change step D over to;
Figure 813838DEST_PATH_IMAGE020
And
Figure 2010106088408100001DEST_PATH_IMAGE024
The time, change step e over to; When ,
Figure 2010106088408100001DEST_PATH_IMAGE028
And
Figure 2010106088408100001DEST_PATH_IMAGE030
The time, change step F over to; At that time, changed step G over to;
C: charging-discharging controller power controlling switching tube ,
Figure 2010106088408100001DEST_PATH_IMAGE034
Disconnect,
Figure 2010106088408100001DEST_PATH_IMAGE036
,
Figure 2010106088408100001DEST_PATH_IMAGE038
Closed, be the photovoltaic cell state that works alone this moment, photovoltaic cell is an electric, photovoltaic cell charges a battery simultaneously, and at that time, the DC/DC booster circuit that is connected with photovoltaic cell worked in the MPPT mode, the MPPT mode is the generating voltage of charging-discharging controller detecting real-time solar panels, and the tracking maximum voltage value, make system reach the highest efficient, when The time, the DC/DC booster circuit that is connected with photovoltaic cell works in constant voltage charging method;
D: charging-discharging controller power controlling switching tube
Figure 701153DEST_PATH_IMAGE032
, disconnect,
Figure 307715DEST_PATH_IMAGE036
,
Figure 301079DEST_PATH_IMAGE038
Closure, jointly be electric state for going out photovoltaic cell and storage battery this moment, photovoltaic cell and storage battery discharge simultaneously, are electric;
E: charging-discharging controller power controlling switching tube
Figure 242359DEST_PATH_IMAGE034
Disconnect,
Figure 917054DEST_PATH_IMAGE032
,
Figure 440439DEST_PATH_IMAGE036
,
Figure 60164DEST_PATH_IMAGE038
Closure, the DC/DC reduction voltage circuit that be connected with AC network this moment is to charge to storage battery, and photovoltaic cell and DC/DC reduction voltage circuit are charge in batteries jointly and are electric jointly;
F: charging-discharging controller power controlling switching tube
Figure 239472DEST_PATH_IMAGE038
Disconnect,
Figure 701547DEST_PATH_IMAGE032
Disconnect, ,
Figure 617867DEST_PATH_IMAGE034
Closure, this moment the AC network operate as normal, at that time, the DC/DC booster circuit that is connected with photovoltaic cell works in the MPPT mode, and the MPPT mode is the generating voltage of charging-discharging controller detecting real-time solar panels, and follows the trail of maximum voltage value, make system reach the highest efficient, when
Figure 533739DEST_PATH_IMAGE040
The time, the DC/DC booster circuit that is connected with photovoltaic cell works in constant voltage charging method, and the DC/DC reduction voltage circuit that is connected with AC network is closed, and photovoltaic cell is a charge in batteries, and AC network provides energy to load;
G: charging-discharging controller power controlling switching tube
Figure 612554DEST_PATH_IMAGE036
,
Figure 48214DEST_PATH_IMAGE038
Disconnect,, Closure, AC network provides energy to load, simultaneously storage battery is charged, and the DC/DC booster circuit that is connected with photovoltaic cell cuts out, and the DC/DC reduction voltage circuit work that is connected with AC network charges a battery.
6. photovoltaic ups system control method according to claim 5, it is characterized in that: before being electric among step C, step D, step e, step F, the step G, power factor correction circuit is corrected power factor (PF), after power factor correction circuit is corrected power factor (PF), through powering load after the inversion of UPS inverter circuit.
7. photovoltaic ups system control method according to claim 6 is characterized in that: before AC network was electric among step F, the step G, rectification circuit further carried out rectification to alternating current.
8. according to any described photovoltaic ups system control method of claim 5-7, it is characterized in that: among step e and the step G, the alternating current of AC network is before entering the DC/DC reduction voltage circuit, through the second rectification circuit rectification.
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