CN103312212A - Photovoltaic inverter - Google Patents
Photovoltaic inverter Download PDFInfo
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- CN103312212A CN103312212A CN2012100718408A CN201210071840A CN103312212A CN 103312212 A CN103312212 A CN 103312212A CN 2012100718408 A CN2012100718408 A CN 2012100718408A CN 201210071840 A CN201210071840 A CN 201210071840A CN 103312212 A CN103312212 A CN 103312212A
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- circuit
- inverter
- inverter circuit
- photovoltaic
- current signal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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 invention relates to a photovoltaic inverter. The photovoltaic inverter comprises a booster circuit, an inverter circuit and a control circuit, wherein the input end of the booster circuit is connected with photovoltaic power generation equipment, and the output end of the booster circuit is connected with a capacitor in parallel and then connected with the input end of the inverter circuit; the output end of the inverter circuit is connected with a power grid; the control circuit is connected with the inverter circuit and the power grid; the inverter circuit is a full-bridge inverter circuit, and comprises four silicon carbide junction type field effect power transistors and diodes which are connected with the two ends of each silicon carbide junction type field effect power transistor in parallel; and the control circuit obtains a given current signal according to the voltage of the power grid and utilizes the given current signal and a tracked current signal which is acquired by the output end of the inverter circuit as input signals, and a pulse-width modulation (PWM) signal is output to the inverter circuit after the processing so as to control the on/off of the silicon carbide junction type field effect power transistors. Compared with the prior art, the inverter has the advantages of high efficiency, simple control, good stability and the like.
Description
Technical field
The present invention relates to a kind of photovoltaic DC-to-AC converter, especially relate to a kind of carborundum junction field power transistor that adopts as the low-loss photovoltaic inverter of inverter circuit element.
Background technology
Along with the attention of the whole world to the energy, environmental issue, people are more and more higher to the expectation of green energy resource, and this has just promoted regenerative resource, especially the development and use of solar energy and wind energy.There is abundant solar energy resources in China, the annual solar electric power can reach 1700TWh, and quiet, safe, pollution-free, the simple installation of photovoltaic generating system, reliability take solar power generation as the basis are high, so realize that being incorporated into the power networks of photovoltaic generating system and utility network has great importance.
Inverter in the photovoltaic system adopts the full-bridge type inversion scheme that is operated in the SPWM state mostly at present, therefore need SPWM pulse generator, synchrolock to equate many links, so control more complicated, reliability is not high, hardware cost is high, and adopting silicon IGBT as element in the full bridge inverter, its switching loss is higher.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of carborundum junction field power transistor that adopts as the low-loss photovoltaic inverter of inverter circuit element for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of photovoltaic DC-to-AC converter, comprise booster circuit, inverter circuit and control circuit, the input of described booster circuit connects photovoltaic power generation equipment, the input that connects inverter circuit behind the output of the booster circuit electric capacity in parallel, the output of described inverter circuit connects electrical network, described control circuit connects inverter circuit and electrical network, described inverter circuit is full bridge inverter, comprise four carborundum junction field power transistors and the diode that is connected in parallel on each carborundum junction field power transistor two ends, described control circuit obtains given current signal according to the voltage of electrical network, and will this given current signal with the follow current signal that collects from the inverter circuit output as input signal, to the inverter circuit output pwm signal, control the break-make of carborundum junction field power transistor after treatment.
Described control circuit comprises that the stagnant chain rate that connects successively is than circuit, minute phase control circuit and drive circuit, described given current signal and follow current signal are inputted than circuit from the chain rate that stagnates, chain rate is exported a level through stagnating, this level is producing the pwm signal that is used for the control inverter circuit via drive circuit after minute phase control.
The output of described inverter is connected and is connected electrical network behind the inductance.
Compared with prior art, the present invention has the following advantages:
1, adopt carborundum junction field power transistor as the inverter circuit element, withstand voltage height, on state resistance is low, leakage current is little, switching speed is high, current density is high, high temperature resistant.
2, adopt new control strategy, namely the voltage with electrical network obtains given current signal, and will this given current signal with the follow current signal that collects from the inverter circuit output as input signal, to the inverter circuit output pwm signal, control algolithm is simple and reliable after treatment.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the efficient comparison diagram of the inverter of the present invention and traditional employing silicon IGBT.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
As shown in Figure 1, a kind of photovoltaic DC-to-AC converter, comprise booster circuit 2, inverter circuit 1 and control circuit 3, the input of booster circuit 2 connects photovoltaic power generation equipment, the input that connects inverter circuit 1 after the output of booster circuit 2 capacitor C in parallel, the output of inverter circuit 1 is connected and is connected electrical network after the inductance L, and control circuit 3 connects inverter circuit 1 and electrical networks.
Basic principle of the present invention is:
After after being incorporated into the power networks, suppose that the switching tube of inverter circuit 1 all is in off-state at the beginning, the current i on the inductance L
sBe zero, this moment i
s *Be just (regulation inflow power network current direction as shown in Figure 1 is for just), as can be known, i
s *With i
sDifference i
s *-i
s＞0, then the output level of hysteresis comparator produces the pwm signal of two pairs of carborundum junction field power transistors of control inverter circuit after minute phase control, makes carborundum junction field power transistor VS
1, VS
4Open-minded, carborundum junction field power transistor VS
2, VS
3Turn-off, because the U of inverter
dGreater than line voltage peak value U
mSo, bear forward on the inductance and press Δ u=U
d-U
mSin ω t is so that flow through the i of inductance
sNear linear rises, and follows the tracks of i
s *, its slope k=(U
d-e
s)/L is (because the switching frequency of carborundum junction field power transistor much larger than mains frequency, therefore can be thought in a switch periods i
s *And e
sSize be a constant).Be i when reaching the predetermined stagnant endless belt upper limit
sWith i
s *Difference i
s-i
s *During＞H/2 (H is wide for the endless belt that stagnates), the chain rate that stagnates is than the upset of circuit 31 output levels, and this level produces pwm signal behind a minute phase control circuit 32, drive circuit 33, change inverter circuit 1 operating state, so that carborundum junction field power transistor VS
1, VS
4Turn-off carborundum junction field power transistor VS
2, VS
3Open-minded, so bear reverse pressure drop Δ u=-(U on the inductance
d+ U
mSin ω t), so that flow through the i of inductance
sNear linear descends, its slope k=-(U
d+ e
s)/L, when reaching under the predetermined stagnant endless belt in limited time, the chain rate that stagnates is overturn again than circuit 31 output levels, turns back to front a kind of state.So go round and begin again, force the current i that flows into electrical network
sAt i
s *-H/2 and i
s *Be sawtooth in the scope between the+H/2 and hummock follow the tracks of i
s *Change, with the line voltage same-phase, realized to the electrical network power output.Work as i
s *During for negative half period, equally can be to the electrical network power output, its operation principle is similar, realizes being incorporated into the power networks.
An important indicator of photovoltaic DC-to-AC converter is exactly efficient, and the loss of inverter mainly is divided into conduction loss, turn-off power loss and switching loss, and the leakage current of silicon carbide device is little, and the device turn-off power loss can be ignored.Compare with silicon device, silicon carbide device does not almost have the oppositely charge-storage effect of recovery, therefore, does not almost have reverse recovery current, the conduction loss in switching tube that is not also caused by reverse recovery current, and the transwitch device then has this part loss.
Adopt the present invention to testing three-phase alternating current output line voltage 380V, power frequency 50Hz, from 0 to 1 kilowatt of power output.Choose the insulating power supply of 4 groups of doubleway outputs as the driving power of inverter circuit, control circuit adopts the TI28346 processor, and this device computing capability is powerful, and the power electronics peripheral hardware is abundant, can satisfy well and implement control and the needs of using.The efficient comparing result of the inverter of the present invention and traditional employing silicon IGBT as shown in Figure 2, as can be seen from the figure, raising along with switching frequency, the lifting of the photovoltaic DC-to-AC converter efficient of employing carborundum junction field power transistor is more and more obvious, during 30kHz, its efficient will improve more than 3% than conventional photovoltaic inverter, embodied the advantage of silicon carbide device aspect high frequencyization and high efficiency, its high frequency so that the volume of volt inverter little, lightweight, be easy to install, high efficiency has been saved resource so that the whole efficient of photovoltaic power generation apparatus raises.
Claims (3)
1. photovoltaic DC-to-AC converter, comprise booster circuit, inverter circuit and control circuit, the input of described booster circuit connects photovoltaic power generation equipment, the input that connects inverter circuit behind the output of the booster circuit electric capacity in parallel, the output of described inverter circuit connects electrical network, described control circuit connects inverter circuit and electrical network, it is characterized in that, described inverter circuit is full bridge inverter, comprise four carborundum junction field power transistors and the diode that is connected in parallel on each carborundum junction field power transistor two ends, described control circuit obtains given current signal according to the voltage of electrical network, and will this given current signal with the follow current signal that collects from the inverter circuit output as input signal, to the inverter circuit output pwm signal, control the break-make of carborundum junction field power transistor after treatment.
2. a kind of photovoltaic DC-to-AC converter according to claim 1, it is characterized in that, described control circuit comprises that the stagnant chain rate that connects successively is than circuit, minute phase control circuit and drive circuit, described given current signal and follow current signal are inputted than circuit from the chain rate that stagnates, chain rate is exported a level through stagnating, this level is producing the pwm signal that is used for the control inverter circuit via drive circuit after minute phase control.
3. a kind of photovoltaic DC-to-AC converter according to claim 1 is characterized in that, the output of described inverter is connected and connected electrical network behind the inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100718408A CN103312212A (en) | 2012-03-16 | 2012-03-16 | Photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100718408A CN103312212A (en) | 2012-03-16 | 2012-03-16 | Photovoltaic inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103312212A true CN103312212A (en) | 2013-09-18 |
Family
ID=49137078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100718408A Pending CN103312212A (en) | 2012-03-16 | 2012-03-16 | Photovoltaic inverter |
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| Country | Link |
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| CN (1) | CN103312212A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141162A (en) * | 2015-10-22 | 2015-12-09 | 保定四方三伊电气有限公司 | Series resonant inverter based on silicon carbide MOSFETs |
| CN106941325A (en) * | 2017-03-08 | 2017-07-11 | 中国矿业大学 | One kind improves carborundum H bridge inverters stability with dropping low-loss method |
| CN106972760A (en) * | 2017-05-26 | 2017-07-21 | 江西清华泰豪三波电机有限公司 | Carborundum inversion control device and generating equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6060859A (en) * | 1997-09-30 | 2000-05-09 | Kabushiki Kaisha Toshiba | Motor driver having a booster circuit and an inverter both controlled by pulse width modulation |
| CN101030705A (en) * | 2006-12-31 | 2007-09-05 | 湖南大学 | Method for tracking and controlling current of hybrid active filter |
| CN201118254Y (en) * | 2007-11-23 | 2008-09-17 | 薛剑鸿 | Large-capacity accumulator modularized discharging device |
| CN101388616A (en) * | 2008-11-03 | 2009-03-18 | 南京航空航天大学 | Double step-down combining inverter |
| CN102130622A (en) * | 2011-04-07 | 2011-07-20 | 上海威特力焊接设备制造股份有限公司 | High-efficiency photovoltaic inverter |
-
2012
- 2012-03-16 CN CN2012100718408A patent/CN103312212A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6060859A (en) * | 1997-09-30 | 2000-05-09 | Kabushiki Kaisha Toshiba | Motor driver having a booster circuit and an inverter both controlled by pulse width modulation |
| CN101030705A (en) * | 2006-12-31 | 2007-09-05 | 湖南大学 | Method for tracking and controlling current of hybrid active filter |
| CN201118254Y (en) * | 2007-11-23 | 2008-09-17 | 薛剑鸿 | Large-capacity accumulator modularized discharging device |
| CN101388616A (en) * | 2008-11-03 | 2009-03-18 | 南京航空航天大学 | Double step-down combining inverter |
| CN102130622A (en) * | 2011-04-07 | 2011-07-20 | 上海威特力焊接设备制造股份有限公司 | High-efficiency photovoltaic inverter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141162A (en) * | 2015-10-22 | 2015-12-09 | 保定四方三伊电气有限公司 | Series resonant inverter based on silicon carbide MOSFETs |
| CN106941325A (en) * | 2017-03-08 | 2017-07-11 | 中国矿业大学 | One kind improves carborundum H bridge inverters stability with dropping low-loss method |
| CN106972760A (en) * | 2017-05-26 | 2017-07-21 | 江西清华泰豪三波电机有限公司 | Carborundum inversion control device and generating equipment |
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Address after: 201108 Shanghai, Minhang District, Hong Jian Road, No. third, building 1, building 99, 2 Applicant after: Leith electric (Shanghai) Co. Ltd. Address before: 200240 C building, No. 4299 Jin Du Road, Shanghai, Minhang District, 1-773 Applicant before: Shanghai Double X Technology Co., Ltd. |
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Application publication date: 20130918 |