CN102856973A - Mains supply compensation device for photovoltaic inverter - Google Patents
Mains supply compensation device for photovoltaic inverter Download PDFInfo
- Publication number
- CN102856973A CN102856973A CN2012103296592A CN201210329659A CN102856973A CN 102856973 A CN102856973 A CN 102856973A CN 2012103296592 A CN2012103296592 A CN 2012103296592A CN 201210329659 A CN201210329659 A CN 201210329659A CN 102856973 A CN102856973 A CN 102856973A
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- CN
- China
- Prior art keywords
- converter
- civil power
- photovoltaic
- photovoltaic cell
- inverter
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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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- Control Of Electrical Variables (AREA)
Abstract
A mains supply compensation device for a photovoltaic inverter comprises a solar photovoltaic panel, a DC (direct current)/DC converter, an inverter and an alternating-current load. The solar photovoltaic panel is connected with the DC/DC converter which is connected with the inverter, and the inverter is connected with the alternating-current load. The mains supply compensation device further comprises a mains supply compensation controller and an AC (alternating current)/DC converter, the main supply grid is connected with the AC/DC converter which is connected with the inverter and the mains supply compensation controller, and the mains supply compensation controller is connected with the DC/DC converter. The mains supply compensation device for the photovoltaic inverter is high in power generation efficiency and lower in cost.
Description
Technical field
The present invention relates to the photovoltaic contravariant generating system, especially a kind of city's power compensation device of photovoltaic DC-to-AC converter.
Background technology
Society production development scale grows stronger day by day, to the demand of the energy also in continuous growth.The total amount of traditional three large energy oil, coal and natural gas is limited, is about to face exhaustion, also can cause environmental pollution and greenhouse effect simultaneously.By contrast, solar energy because it is pollution-free, widely distributed and amount of radiation is high, is known as optimal new forms of energy one of by international community as a kind of renewable resource.Photovoltaic generation then is efficiently to utilize one of optimal path of solar energy at present, the further investigation photovoltaic power generation technology, and improving generating efficiency has great theory and realistic meaning.
Traditional photovoltaic DC-to-AC converter generally is comprised of solar-energy photo-voltaic cell, energy-storage travelling wave tube, controller, transformer, inverter circuit and filter circuit etc.The energy source of photovoltaic cell is in the sun, and differs in the illumination condition various places, is subjected to simultaneously the impact of cloud layer and earth rotation, always is in the state of variation.In order to guarantee that the extraneous factors such as illumination can not affect the normal operation of load, certainly will to take certain measure to stablize the power output of photovoltaic cell.Generally take at present energy storage technology to come the power output of balance photovoltaic cell, and be the lead acid accumulator energy storage more widely in the photovoltaic generation sector application.
When photovoltaic generating system was equipped with lead acid accumulator, the excess energy that photovoltaic cell produces deposited in the storage battery, and powered with photovoltaic cell when illumination is not enough.The problem that exists is to use batteries to store energy need to consider the space that batteries is shared, and change the required maintenance cost of storage battery.In addition, the expense of processing scrapped batteries also is the development that very high, too high cost has restricted photovoltaic industry, so that photovoltaic generation is difficult to promote on a large scale.
Summary of the invention
In order to overcome the deficiency that generating efficiency is lower, cost is higher of existing photovoltaic generating system, the invention provides city's power compensation device that a kind of generating efficiency is higher, reduce the photovoltaic DC-to-AC converter of cost.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of city's power compensation device of photovoltaic DC-to-AC converter, comprise solar energy photovoltaic panel, DC/DC converter, inverter and AC load, described solar energy photovoltaic panel is connected with the DC/DC converter, and described DC/DC converter is connected with inverter, and described inverter is connected with AC load; Described city power compensation device also comprises civil power compensating controller and AC/DC converter, utility grid is connected with the AC/DC converter, described AC/DC converter is connected with inverter, described AC/DC converter is connected with the civil power compensating controller, described civil power compensating controller links to each other with the DC/DC converter, wherein, in the described civil power compensating controller
Access civil power when the output power from photovoltaic cells is not enough, initial time has U
cU
b, photovoltaic cell and civil power side converter carry out the change of current, I
cRise I
bDescend; It is that the photovoltaic cell working point moves to right U that the photovoltaic cell output current descends
bBegin to rise; At I
bDropped to before zero U
c=U
b, I
bNo longer descend;
Output or the illumination enhancing of regulating the civil power side converter make U
c＜U
b, photovoltaic cell and the again change of current of civil power side converter, I
bRise, descend; It is that the photovoltaic cell working point moves to left U that the photovoltaic cell output current rises
bBegin to descend; If at I
cU is still arranged before dropping to zero
c＜U
b, civil power withdraws from power supply, otherwise at I
cDropped to before zero U
c=U
b, I
cNo longer descend.
Beneficial effect of the present invention is mainly manifested in: (1) civil power compensation way can shift to an earlier date the initial power supply moment of photovoltaic generating system, prolongs the operating time of photovoltaic generating system;
(2) the civil power compensation way can take full advantage of the solar energy that is in the compensation range, improves generating efficiency;
(3) the civil power compensation way does not need to be equipped with high-power photovoltaic cell, is reducing power-on time or is improving under the prerequisite of civil power Remedy percent even can reduce the power grade of photovoltaic cell, Cost reduction;
(4) the civil power compensation way does not need the space of considering that energy-storage battery takies, can not cause environmental pollution yet.
Description of drawings
Fig. 1 is for to open up the benefit structure chart based on the photovoltaic DC-to-AC converter of city's electronic compensating.
Fig. 2 is city's power compensation device power-balance principle schematic.
Fig. 3 is the photovoltaic DC-to-AC converter workflow diagram based on city's electronic compensating.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
With reference to Fig. 1～Fig. 3, a kind of city's power compensation device of photovoltaic DC-to-AC converter comprises solar energy photovoltaic panel, DC/DC converter, inverter and AC load, and described solar energy photovoltaic panel is connected with the DC/DC converter, described DC/DC converter is connected with inverter, and described inverter is connected with AC load; Described city power compensation device also comprises civil power compensating controller and AC/DC converter, utility grid is connected with the AC/DC converter, and described AC/DC converter is connected with inverter, and described AC/DC converter is connected with the civil power compensating controller, described civil power compensating controller and DC/DC converter
Wherein, the civil power compensating controller can determine whether open compensate function according to present behavior, guarantees that the utilance of photovoltaic cell reaches the highest.Fig. 1 is for to open up the benefit structure chart based on the photovoltaic DC-to-AC converter of city's electronic compensating.
When two voltage sources are in parallel, only have both simultaneously outside power outputs of output voltage ability in full accord, otherwise only have the outside power output of the high voltage source of output voltage.Consider as shown in Figure 2 circuit, photovoltaic cell and AC/DC converter power to the load U after by diodes in parallel
b, I
b, P
bBe respectively output voltage, electric current and the power of photovoltaic cell, U
c, I
c, P
cBe respectively output voltage, electric current and the power of AC/DC converter, U, I, P are respectively voltage, electric current and the power in the load.
Just access civil power in the situation of the output power from photovoltaic cells deficiency, so initial time there is U
cU
b, photovoltaic cell and civil power side converter carry out the change of current, I
cRise I
bDescend.It is that the photovoltaic cell working point moves to right U that the photovoltaic cell output current descends
bBegin to rise.Because the open circuit voltage of photovoltaic cell must be higher than U
c, at I
bDropped to before zero U
c=U
b, I
bNo longer descend.
Output or the illumination enhancing of regulating the civil power side converter make U
c＜U
b, photovoltaic cell and the again change of current of civil power side converter, I
bRise I
cDescend.It is that the photovoltaic cell working point moves to left U that the photovoltaic cell output current rises
bBegin to descend.If at I
cU is still arranged before dropping to zero
c＜U
b, meaning the separately power supply of load-supporting of photovoltaic cell, civil power can withdraw from power supply, otherwise at I
cDropped to before zero U
c=U
b, I
cNo longer descend.
In sum, when the output power from photovoltaic cells is not enough, no matter be illumination or U
cU has changed
c=U
b, and I
bBe not subjected to I
cConstraint, with the same under normal circumstances only be U
bReach the function of illumination, temperature, P
b=U
b* I
b, so P
bAlso only with U
bAnd illumination, temperature are relevant, change U
c, P
bAlso change thereupon.Because P
c=P-P
bSo the civil power side converter is only exported the power of photovoltaic cell insufficient section.Fig. 2 is city's power compensation device power-balance principle schematic.
During system works, photovoltaic cell produces electric energy under solar radiation, and electric energy need not to be kept in the energy-storage travelling wave tube, but is detected the power output of photovoltaic cell this moment by the civil power compensate control apparatus.If power enough then directly be promoted to required voltage by the DC/DC conversion, inversion after voltage stabilizing reaches city's electric standard of 220V/50Hz, supply load again through filtering; If the photovoltaic cell underpower is opened the civil power compensate function, the power by civil power completion deficiency is converted into DC voltage-stabilizing via AC/DC, carries out inversion again, can reach equally the standard of civil power after the filtering.Fig. 3 is the photovoltaic DC-to-AC converter workflow diagram based on city's electronic compensating.
Claims (1)
1. city's power compensation device of a photovoltaic DC-to-AC converter, comprise solar energy photovoltaic panel, DC/DC converter, inverter and AC load, described solar energy photovoltaic panel is connected with the DC/DC converter, and described DC/DC converter is connected with inverter, and described inverter is connected with AC load; It is characterized in that: described city power compensation device also comprises civil power compensating controller and AC/DC converter, utility grid is connected with the AC/DC converter, described AC/DC converter is connected with inverter, described AC/DC converter is connected with the civil power compensating controller, described civil power compensating controller and DC/DC converter, wherein, in the described civil power compensating controller
Access civil power when the output power from photovoltaic cells is not enough, initial time has U
cU
b, photovoltaic cell and civil power side converter carry out the change of current, I
cRise I
bDescend; It is that the photovoltaic cell working point moves to right U that the photovoltaic cell output current descends
bBegin to rise; At I
bDropped to before zero U
b=U
c, I
bNo longer descend;
Output or the illumination enhancing of regulating the civil power side converter make U
c＜U
b, photovoltaic cell and the again change of current of civil power side converter, I
bRise I
cDescend; It is that the photovoltaic cell working point moves to left U that the photovoltaic cell output current rises
bBegin to descend; If at I
cU is still arranged before dropping to zero
c＜U
b, civil power withdraws from power supply, otherwise at I
cDropped to before zero U
b=U
c, I
cNo longer descend.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103296592A CN102856973A (en) | 2012-09-07 | 2012-09-07 | Mains supply compensation device for photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103296592A CN102856973A (en) | 2012-09-07 | 2012-09-07 | Mains supply compensation device for photovoltaic inverter |
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| Publication Number | Publication Date |
|---|---|
| CN102856973A true CN102856973A (en) | 2013-01-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103296592A Pending CN102856973A (en) | 2012-09-07 | 2012-09-07 | Mains supply compensation device for photovoltaic inverter |
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| CN (1) | CN102856973A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810913A (en) * | 2015-05-22 | 2015-07-29 | 蚌埠市徽泰电气自动化有限公司 | Photovoltaic power generation device based on commercial power compensation and water pump system of photovoltaic power generation device |
| WO2020244667A1 (en) * | 2019-06-06 | 2020-12-10 | 华为技术有限公司 | Power supply circuit and inverter |
| CN112713622A (en) * | 2019-10-25 | 2021-04-27 | 华为技术服务有限公司 | Power supply method, device and base station |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05108176A (en) * | 1991-10-17 | 1993-04-30 | Tonen Corp | Solar battery power source |
| US5560218A (en) * | 1993-11-26 | 1996-10-01 | Samsung Electronics Co., Ltd. | Control apparatus and method for an air conditioner |
| CN101951011A (en) * | 2010-08-25 | 2011-01-19 | 南京航空航天大学 | Solar photovoltaic and commercial power combined power supply system and control method thereof |
| CN102403776A (en) * | 2010-09-19 | 2012-04-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Hybrid power supply system and hybrid power supply method for air conditioner |
-
2012
- 2012-09-07 CN CN2012103296592A patent/CN102856973A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05108176A (en) * | 1991-10-17 | 1993-04-30 | Tonen Corp | Solar battery power source |
| US5560218A (en) * | 1993-11-26 | 1996-10-01 | Samsung Electronics Co., Ltd. | Control apparatus and method for an air conditioner |
| CN101951011A (en) * | 2010-08-25 | 2011-01-19 | 南京航空航天大学 | Solar photovoltaic and commercial power combined power supply system and control method thereof |
| CN102403776A (en) * | 2010-09-19 | 2012-04-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Hybrid power supply system and hybrid power supply method for air conditioner |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810913A (en) * | 2015-05-22 | 2015-07-29 | 蚌埠市徽泰电气自动化有限公司 | Photovoltaic power generation device based on commercial power compensation and water pump system of photovoltaic power generation device |
| WO2020244667A1 (en) * | 2019-06-06 | 2020-12-10 | 华为技术有限公司 | Power supply circuit and inverter |
| US11532938B2 (en) | 2019-06-06 | 2022-12-20 | Huawei Digital Power Technologies Co., Ltd. | Power supply circuit and inverter |
| CN112713622A (en) * | 2019-10-25 | 2021-04-27 | 华为技术服务有限公司 | Power supply method, device and base station |
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Application publication date: 20130102 |