CN205160400U - Seven single -phase inverter and photovoltaic power generation device - Google Patents
Seven single -phase inverter and photovoltaic power generation device Download PDFInfo
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- CN205160400U CN205160400U CN201520812908.2U CN201520812908U CN205160400U CN 205160400 U CN205160400 U CN 205160400U CN 201520812908 U CN201520812908 U CN 201520812908U CN 205160400 U CN205160400 U CN 205160400U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- 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 utility model relates to a dc -to -ac converter, concretely relates to seven single -phase inverter and photovoltaic power generation device, including 6 power switch device S1 -S6, these seven single -phase inverter have a symmetry, and its input distributes in the left and right sides and links to each other with the input power respectively, and the output is connected at the both ends of alternating load, and the voltage that seven single -phase inverter exported alternating load (6) both ends under the normal mode is seven level forms, imports in certain one end and can move in single -phase H bridge mode under power failure circumstances, and the voltage of exporting alternating load (6) both ends is two level forms. The utility model discloses small, the static investment is few, and the power switch device in the dc -to -ac converter need not to set up the blind spot guard time, and the electric energy quality is higher. Simultaneously, the device has automatic fault -tolerant serviceability, and after certain one end photovoltaic array input is broken down, but automatic operation has improved the service reliability of load in single -phase H bridge mode greatly.
Description
Technical field
The utility model relates to a kind of inverter, is specifically related to a kind of single-phase seven electrical level inverters and photovoltaic power generation apparatus.
Background technology
Along with energy crisis appearance and science and technology progress, the utilization of new forms of energy and research obtain and develop rapidly, and wherein solar energy resources is widely distributed, inexhaustible and pollution-free be one of new forms of energy of current most prospect.Especially on some outlying mountain areas and the ground such as island, pasture, photovoltaic generation is the primary selection of residential electricity consumption, and in recent years along with the support of national policy, increasing roof photovoltaic generation project is arisen at the historic moment.
At present; the single-phase photovoltaic inversion device output level number that market extensively adopts is low; device for power switching arrange the dead zone protection time cause export the quality of power supply poor; need to increase extra passive filtration unit; because middle low power occasion photovoltaic array output voltage is low; need to increase boosting inverter at outlet side, device volume is large, and reliability is low.
Utility model content
For solving the deficiency of above-mentioned existence, the utility model provides a kind of single-phase seven electrical level inverters and photovoltaic power generation apparatus, and concrete technical scheme is as follows:
A kind of single-phase seven electrical level inverters, described single-phase seven electrical level inverters comprise 6 device for power switching S1-S6; These single-phase seven electrical level inverters have symmetry, its input is distributed in the left and right sides and is connected with input power respectively, output is connected to the two ends of AC load, the voltage that under normal mode of operation, single-phase seven electrical level inverters output to AC load two ends is seven level forms, under certain one end input power failure condition, may operate at single-phase H bridge mode, the voltage outputting to AC load two ends is two level forms.
Use a photovoltaic power generation apparatus for above-mentioned single-phase seven electrical level inverters, comprising: PV1 photovoltaic battery array, PV1 array booster circuit, single-phase seven electrical level inverters, PV2 array booster circuit, PV2 photovoltaic battery array, AC load, cpu controller, voltage detection unit and isolation drive unit, described PV1 photovoltaic battery array and PV2 photovoltaic battery array are as the input DC power of device, be connected with the input of PV2 array booster circuit with single-phase seven electrical level inverters respectively by PV1 array booster circuit, DC inverter after boosting becomes alternating current for AC load by single-phase seven electrical level inverters, and voltage detection unit gathers PV1 photovoltaic battery array respectively, PV1 array booster circuit, PV2 array booster circuit, the output voltage signal of PV2 photovoltaic battery array also passes to cpu controller, and cpu controller exports 8 road pwm signal control PV1 array booster circuits by isolation drive unit, the turn-on and turn-off of the device for power switching in single-phase seven electrical level inverters and PV2 array booster circuit.
Preferably, described PV1 array booster circuit is made up of device for power switching Sf, 2 diodes Df1, Df2 and inductance L f, electric capacity Cf, resistance Rf, coordinate the pass-through state of the power switch in single-phase seven electrical level inverters can realize exporting the boosting of photovoltaic battery array, and without the need to arranging Dead Time in inverter circuit, described PV2 array booster circuit has the symmetrical structure of PV1 array booster circuit, and the two output dc voltage polarity is contrary.
Preferably, described CPU model is TMS320F28335, and power device is IGBT, and isolation drive unit adopts HCPL-316J chip and peripheral processes circuit thereof, and voltage detection unit adopts AVS400-SD-420E AC voltage transformer and peripheral processes circuit thereof.
The utility model has following beneficial effect relative to prior art:
Only realize single-phase seven level alternating voltages with 6 power devices to export; output-voltage levels number is more than 3 times of common single-phase inverter; adopt DC voltage booster circuit can realize the direct boosting inversion of low-power photovoltaic battery; without the need to outlet side step-up transformer; volume is little; static investment is few, and the device for power switching in inverter is without the need to arranging the dead zone protection time, and the quality of power supply is higher.Meanwhile, device has automatic fault tolerant serviceability, after certain one end photovoltaic array input is broken down, automatically can operate in single-phase H bridge mode, substantially increase the power supply reliability of load.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit structure diagram of the utility model device;
Fig. 2 is single-phase seven electrical level inverter switch-turn-ON states figure;
Fig. 3 is device for power switching driver element circuit diagram;
Fig. 4 is voltage detecting and peripheral processes circuit diagram thereof.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment 1:
In present embodiment, composition graphs 1, illustrates the operation principle of single-phase seven electrical level inverters 3 in the utility model.Definition PV1 photovoltaic battery array 1 output voltage is Vgf, PV1 array booster circuit 2 exports as Vf0, PV2 photovoltaic battery array 5 output voltage is Vgt, PV2 array booster circuit 4 exports as Vt0, AC load 6 both end voltage is V0, in the present embodiment, voltage detection unit comprises: PV1 voltage detection unit 8, Vf0 voltage detection unit 9, Vt0 voltage detection unit 11 and PV2 voltage detection unit 12, according to the different conditions of six device for power switching S1-S6 in inverter 3, load end output voltage V0 can be obtained and present seven kinds of states, as shown in Figure 2.Because PV1 array booster circuit 2 and PV2 array booster circuit 4 have symmetrical structure, analyze its boosting operation principle for the former below.Under initial condition, in PV1 array booster circuit 2, electric capacity Cf both end voltage equals the output voltage Vgf of photovoltaic cell, and the electric current flowing through inductance L f is zero.Under pass-through state, i.e. Sf, S1, S2 conducting, diode Df1, Df2 are reverse-biased, photovoltaic cell PV1 and electric capacity Cf charges to inductance L f, inductance L f both end voltage is VLf=Vgf+Vf0, under non-pass-through state, and diode Df1, Df2 conducting, inductance L f discharges, and now inductance both end voltage is VLf=Vgf-Vf0.In steady operation situation, according to one-period internal inductance two ends voltage-second balance principle, can obtain boosting coefficient B=Vf0/Vgf=1/ (1-2D), wherein D is conducting duty ratio.As 0<D<0.5, output voltage all has boosting effect, gets D=0.45 in present embodiment, coefficient B=10 of namely boosting, and AC load both end voltage peak value can reach the photovoltaic array output voltage of ten times.In addition, when getting Vgt=2Vgf, AC load terminal voltage presents 0, ± 10Vgf, ± 20Vgf, these seven kinds of level of ± 30Vgf.Because device adopts two ends photovoltaic array to power, after certain one end photovoltaic array breaks down, the permanent conducting of S5, S6, plant running is at single-phase H bridge mode, and adjust conducting duty ratio, still can realize single-phase inversion is load supplying, improves power supply reliability simultaneously.
Embodiment 2:
In present embodiment, composition graphs 3, illustrates isolation drive and the defencive function of power device in the utility model device.DSP control system exports pwm pulse and drives IGBT by HCPL-316J, and realizes overcurrent, under-voltage protection and fault feedback function.Pwm pulse inputs the drive singal by obtaining power tube after light-coupled isolation amplification in chip by VIN+, and is exported by pin VOUT.FAULT is fault message output, and when IGBT is in over-current state, CBLANK shows the time being issued to protection response by fault-signal, thus has avoided the reduction time of VCE.If circuit malfunctions, HCPL-316J will automatically shut down IGBT, and send fault-signal to control system, and controller blocks and exports.When after failture evacuation, to reset HCPL-316J by setting low level to RESET end.In figure, C3 mainly plays charging time-lag action, when system bootrom is started working, because the collector terminal voltage (Vc) of IGBT is much larger than 7V, if do not have C3, the mistake of short circuit fault signal will be caused to produce, thus shielding output signal.Under chip is in normal operating conditions, if Vc raises suddenly, after this recover immediately, if there is no C3, equally also can cause the fault-signal of mistake, cause power device to turn off by mistake.
Embodiment 3:
In present embodiment, composition graphs 4, illustrates voltage detecting and peripheral processes circuit working process thereof in the utility model device.AVS400-SD-420E AC voltage transformer, measuring voltage scope is 0-400VAC, output current is 4-20mA, for gathering for AD in DSP, the signal of output is needed to carry out corresponding conversion process, the signal that AC voltage transformer exports is input to U1 and carries out light-coupled isolation, then voltage signal is converted to through U2, U3 circuit mirror current, be input to voltage follower U4, improve the antijamming capability of signal, be then input to negative circuit U5 and carry out negate in proportion, in order to ensure to amplify precision, by voltage reference circuit U8, return to zero for late-class circuit.
The utility model provides a kind of single-phase seven electrical level inverters; only realize single-phase seven level alternating voltages with 6 power devices to export; output-voltage levels number is more than 3 times of common single-phase inverter; adopt DC voltage booster circuit can realize the direct boosting inversion of low-power photovoltaic battery; without the need to outlet side step-up transformer, volume is little, and static investment is few; device for power switching in inverter is without the need to arranging the dead zone protection time, and the quality of power supply is higher.Meanwhile, device has automatic fault tolerant serviceability, after certain one end photovoltaic array input is broken down, automatically can operate in single-phase H bridge mode, substantially increase the power supply reliability of load
Above embodiment only in order to the technical solution of the utility model to be described, is not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (4)
1. single-phase seven electrical level inverters, is characterized in that, described single-phase seven electrical level inverters (3) comprise 6 device for power switching S1-S6; These single-phase seven electrical level inverters have symmetry, its input is distributed in the left and right sides and is connected with input power respectively, output is connected to the two ends of AC load, under normal mode of operation, single-phase seven electrical level inverters output to the voltage at AC load (6) two ends is seven level forms, under certain one end input power failure condition, may operate at single-phase H bridge mode, the voltage outputting to AC load (6) two ends is two level forms.
2. one kind is used the photovoltaic power generation apparatus of single-phase seven electrical level inverters according to claim 1, it is characterized in that, comprise: PV1 photovoltaic battery array (1), PV1 array booster circuit (2), single-phase seven electrical level inverters (3), PV2 array booster circuit (4), PV2 photovoltaic battery array (5), AC load (6), cpu controller (7), voltage detection unit and isolation drive unit (10), described PV1 photovoltaic battery array (1) and PV2 photovoltaic battery array (5) are as the input DC power of device, be connected with the input of PV2 array booster circuit (4) with single-phase seven electrical level inverters (3) respectively by PV1 array booster circuit (2), DC inverter after boosting becomes alternating current for AC load (6) by single-phase seven electrical level inverters (3), voltage detection unit gathers PV1 photovoltaic battery array (1) respectively, PV1 array booster circuit (2), PV2 array booster circuit (4), the output voltage signal of PV2 photovoltaic battery array (5) also passes to cpu controller (7), cpu controller (7) exports 8 road pwm signal controls PV1 array booster circuit (2) by isolation drive unit (10), the turn-on and turn-off of the device for power switching in single-phase seven electrical level inverters (3) and PV2 array booster circuit (4).
3. a kind of photovoltaic power generation apparatus according to claim 2, it is characterized in that: described PV1 array booster circuit (2) is by device for power switching Sf, 2 diode Df1, Df2, and inductance L f, electric capacity Cf, resistance Rf forms, coordinate the pass-through state of the power switch in single-phase seven electrical level inverters (3) can realize exporting the boosting of photovoltaic battery array, and without the need to arranging Dead Time in inverter circuit, described PV2 array booster circuit (4) has the symmetrical structure of PV1 array booster circuit (2), the two output dc voltage polarity is contrary.
4. a kind of photovoltaic power generation apparatus according to claim 2, it is characterized in that: described CPU model is TMS320F28335, power device is IGBT, isolation drive unit adopts HCPL-316J chip and peripheral processes circuit thereof, and voltage detection unit adopts AVS400-SD-420E AC voltage transformer and peripheral processes circuit thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520812908.2U CN205160400U (en) | 2015-10-16 | 2015-10-16 | Seven single -phase inverter and photovoltaic power generation device |
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| CN201520812908.2U CN205160400U (en) | 2015-10-16 | 2015-10-16 | Seven single -phase inverter and photovoltaic power generation device |
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| CN205160400U true CN205160400U (en) | 2016-04-13 |
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| CN201520812908.2U Expired - Fee Related CN205160400U (en) | 2015-10-16 | 2015-10-16 | Seven single -phase inverter and photovoltaic power generation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786729A (en) * | 2016-11-22 | 2017-05-31 | 阜阳师范学院 | A kind of microgrid unsteady flow energy storage device and its energy management method |
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- 2015-10-16 CN CN201520812908.2U patent/CN205160400U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786729A (en) * | 2016-11-22 | 2017-05-31 | 阜阳师范学院 | A kind of microgrid unsteady flow energy storage device and its energy management method |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160413 Termination date: 20161016 |