CN102710164A - Photovoltaic inverter - Google Patents
Photovoltaic inverter Download PDFInfo
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- CN102710164A CN102710164A CN2012101739986A CN201210173998A CN102710164A CN 102710164 A CN102710164 A CN 102710164A CN 2012101739986 A CN2012101739986 A CN 2012101739986A CN 201210173998 A CN201210173998 A CN 201210173998A CN 102710164 A CN102710164 A CN 102710164A
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- inverter
- photovoltaic
- inverting
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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
- Y02B10/10—Photovoltaic [PV]
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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. A circuit of the photovoltaic inverter mainly comprises four parts including a boosting circuit, an inverting circuit, a filtering circuit and a control circuit, wherein the boosting circuit is connected with the inverting circuit; the inverting circuit is connected with the filtering circuit; and the control circuit controls an entire inverting process. The boosting circuit uses a common BOOST boosting circuit; the inverting circuit uses an IGBT (Insulated Gate Bipolar Translator) fully-controlled device; and with the adoption of the full-bridge voltage type inverting structure, direct current can be accurately converted into alternative current by controlling switching-on/off of an IGBT. The filtering circuit uses an LC low-pass filter circuit. The boosting circuit and the inverting circuit are coordinately operated under the control of the control circuit. According to the photovoltaic inverter provided by the invention, a high-property DSP (Digital Signal Processor) chip TMS320LF2406 is used as a core of the control circuit, so that the inverting process can be rapidly and accurately controlled and monitored. The photovoltaic inverter using the design has the advantages of high working efficiency, strong reliability and good reliability. Meanwhile, the photovoltaic inverter has the functions of maximum power point tracing, anti-islanding effect and the like.
Description
Technical field
The invention belongs to field of photovoltaic power generation, being specifically related to a kind of can be the photovoltaic DC-to-AC converter that the direct current of solar cell or the other system of electric energy converts alternating current to solar energy converting.
Background technology
Since striding into 21 century, the mankind are faced with the significant challenge that realizes economy and social sustainable development, and under the dual restriction of limited resources and environmental protection strict demand, developing the economy becomes global hot issue.And energy problem will be more outstanding, not only show the deficient not enough of conventional energy resource, the more important thing is that the development and use of fossil energy have brought a series of problems, and like environmental pollution, greenhouse effect etc. are all relevant with fossil fuel.Present environmental problem, be to a great extent since the energy particularly the development and use of fossil energy cause, the mankind will solve these energy problems, realize relying on scientific and technological advances sustainable development, develop renewable clear energy sources on a large scale.
Theoretically, photovoltaic power generation technology can be used for any occasion that needs power supply, goes up to spacecraft, down to domestic power supply, arrives the MW class power station greatly, and little of toy, photo-voltaic power supply is ubiquitous.It is predicted that solar energy power generating can occupy the important seat that world energy sources is consumed in 21 century, not only will substitute the part conventional energy resource, and will become the main body of world energy supplies.Expect the year two thousand thirty, regenerative resource will account for more than 30% in the total energy structure, and the accounting of solar energy power generating in world's total electricity supply also will reach more than 10%; To the year two thousand forty, regenerative resource will account for more than 50% of total energy consumption, and solar energy power generating will account for more than 20% of total electricity; To 21 century Mo, regenerative resource will account in energy resource structure more than 80%, and solar power generation will account for more than 60%.These numerals are enough to demonstrate the development prospect of photovoltaic industry and in the energy field important strategic position.
Summary of the invention
The present invention is directed to the defective that prior art exists, a kind of photovoltaic DC-to-AC converter is provided, can solar absorption be changed into electric energy, convert alternating current into, for the household appliances or the use of being incorporated into the power networks by direct current.
Photovoltaic combining inverter is used at a kind of family, realizes that the technical scheme of above-mentioned purpose is: comprise control board, and base plate, base is characterized in that: said base plate is installed on the base, and control board is installed on the base plate; Said control board is core with the dsp chip; Handle through the voltage and current signal of collection and the comparing unit of chip internal, calculate back output control signal, pass to base plate through data wire; Through after the light-coupled isolation; Produce the pwm control signal that control IGBT opens or turn-offs, base is a radiator, when inverter is worked, plays a protective role.The circuit of whole inverter comprises booster circuit, inverter circuit, filter circuit and control circuit, and booster circuit is connected with inverter circuit, and inverter circuit is connected with filter circuit, and control circuit is controlled the whole system circuit.Booster circuit adopts the BOOST boost circuit structure, and said inverter circuit adopts full-bridge voltage-type inverter structure.Control circuit is realized the control to BOOST booster circuit and inverter circuit.Booster circuit and inverter circuit be coordinate operation under the control of control circuit.The present invention has adopted high performance DSP digital signal processing chip TMS320LF2406 to monitor, can be fast and accurately to complete machine operation enforcement control and monitoring, and RS485 communication and human-computer interaction interface have also improved the expansion and the practicality of complete machine.
Said booster circuit has adopted the BOOST circuit structure, and turn-offing duty ratio through the conducting of power controlling switching device can be promoted to the photovoltaic array output voltage about 150V ~ 550V.In addition, through being implemented under the different ambient temperature and sunshine condition the power output of the capture photovoltaic array of maximum possible to the detection of photovoltaic array output voltage, electric current and the maximal power tracing control of DSP.
Said inverter circuit is the imported full bridge inverter of voltage source, and it is flexible that this structure has the inversion algorithm, the high advantage of the output quality of power supply.Fly-wheel diode of four switching device difference inverse parallels, the inversion system of formation doube bridge arm.
Said filter circuit comprises inductance and filter capacitor, and their output is connected with electrical network, and input is connected with inverter.The effect of filter circuit is to reduce the inverter output current, improves the output quality of power supply of inverter.
Said control circuit has adopted high performance DSP digital signal processing chip TMS320LF2406 to carry out system's control and monitoring.
After the present invention adopted technique scheme, the inverter complete machine can be realized the maximal power tracing of photovoltaic array, for electrical network provides harmonic wave few, and high-quality electric energy.Complete machine is stable, reliable, and whole efficiency is high.
The present invention has following conspicuous outstanding substantive distinguishing features and marked improvement compared with prior art:
1), the IGBT short-circuit protection realizes powerful IGBT abnormal condition protection with owing drive feedback compensation, the optical fiber encoding and decoding technique that IGBT drives with protection improves the antijamming capability of system under big electric current; Utilize the integrated morphology of noninductive bus row and high life thin-film capacitor to reduce the impact of di/dt and du/dt, highly reliable, the low-loss of realization high power contravariant device and long-life.
2), low pressure input (Vdc < 40V), big step-up ratio (1:8), efficient conversion (> 98.5%), the DC/DC circuit design technique of low ripple breaks through the global problem of photovoltaic generating system in the BIPV applications, improves the fail safe of system.
3), utilize DSP embedded system+FPGA association treatment technology make up out 32 high accuracy triple modular redundant SVPWM space vectors calculate, be incorporated into the power networks low harmonic wave control with repeat to control, the hardware association treatment technology of core algorithms such as the quick MPPT tracking of high accuracy; Realized the important breakthrough of digital control system real-time, high reliability, reached advanced world standards.
4), the idle disturbance active detecting of M sequence+passive algorithm that detects; Turn-off with the level two protection system of switch disjunction tactful in conjunction with IGBT; Make system in 900ms, accomplish island detection and protection response, cut off being connected of electrical network and photovoltaic generating system, effectively solve anti-isolated island be controlled in the practical applications blind area greatly, response speed waits the bottleneck technical barrier slowly; Performance is higher than specification requirements such as UL1741, DIN0126, reaches the advanced international standard of anti-isolated island control.
5), the calm control technology of distributed photovoltaic grid-connected system and dispersion self-discipline regulation technology; Solve DC bus-bar voltage fluctuation or vibration altogether; And technical barrier such as inverter output current harmonic content increase, realize the operation control of the distributed connecting system high stability of dc bus.
Description of drawings
Fig. 1 is the shape assumption diagram of photovoltaic DC-to-AC converter of the present invention
Fig. 2 is the Circuits System block diagram of photovoltaic DC-to-AC converter of the present invention
Fig. 3 is that the system of photovoltaic DC-to-AC converter of the present invention forms structured flowchart
Fig. 4 is the booster circuit schematic diagram of photovoltaic DC-to-AC converter of the present invention
Fig. 5 is the circuit diagram of photovoltaic DC-to-AC converter of the present invention
Fig. 6 is the control circuit structured flowchart of photovoltaic DC-to-AC converter.
Embodiment
The preferred embodiments of the present invention accompanying drawings is following:
Embodiment one:
Structure is as shown in Figure 1; Photovoltaic combining inverter is by control board (1); Base plate (2); Base (3) three parts are formed, and base (1) is installed on the base (3), and control board (1) is installed on the base plate (2); Direct current input adapter (4) is arranged on base plate (2) and exchange out splice going splice (5), and light-coupled isolation (6) is arranged.The circuit of inverter is like Fig. 2, shown in 3; Comprise booster circuit (1 '), inverter circuit (2 '), filter circuit (3 ') and control circuit (4 '); Booster circuit (1 ') is connected with inverter circuit (2 '); Inverter circuit (2 ') is connected with filter circuit (3 '), and control circuit (4 ') is controlled the whole system circuit.
Embodiment two:
Present embodiment and embodiment one are basic identical, and characteristic is pointed out as follows:
Said control board (1) is core with the dsp chip; Handle through the voltage and current signal of collection and the comparing unit of chip internal, calculate back output control signal, be transferred to base plate (2) through data wire; Through after the light-coupled isolation, produce the pwm control signal that control IGBT opens or turn-offs.Can the direct current signal of importing be reverse into AC signal fast and accurately to complete machine operation enforcement control and monitoring, RS485 communication and human-computer interaction interface have also improved the expansion and the practicality of complete machine.Base is a radiator (4), when inverter is worked, plays a protective role.
Said booster circuit (1 ') has adopted the BOOST booster circuit, and the schematic diagram of the part of boosting is as shown in Figure 3.When switching device V was in on-state, service time was t
OnPower supply E charges to inductance L, charging current substantially constant (i
1), the voltage on the capacitor C is to load R power supply simultaneously, and capacitor C is very big, can keep output voltage U basically
oBe steady state value.When V is in off-state, turn-off time t
OffPower supply E and inductance L are charged to capacitor C jointly, and to load energy are provided.Energy according to inductance L in one-period T savings equates with the energy of release, i.e. E*i1*t
On=(U
o-E) * i
1* t
Off, can get U behind the abbreviation
o=(T/ t
Off) * E.Hence one can see that, and we can turn-off duty ratio through the conducting of power controlling switching device and can the photovoltaic array output voltage be promoted to about the 150V ~ 550V voltage of possibility of reversal.In addition, through being implemented under the different ambient temperature and sunshine condition the power output of the capture photovoltaic array of maximum possible to the detection of photovoltaic array output voltage, electric current and the maximal power tracing control of DSP.
Said inverter circuit (2 ') is the imported full bridge inverter of voltage source, and it is flexible that this structure has the inversion algorithm, the high advantage of the output quality of power supply.As shown in Figure 4, T1 and D1 inverse parallel, T2 and D2 inverse parallel, T3 and D3 inverse parallel, T4 and D4 inverse parallel constitute doube bridge arm inversion system.By control circuit pwm signal is provided; Control T1 ~ T4 opening or turn-offing, and it is open-minded that T4 keeps, and T2 and T3 all turn-off; Control T1 switch and then control voltage pulse width this moment; When being applied on the link with inertia according to the equal and variform burst pulse of momentum, its effect is basic identical, can equivalence becomes the sinusoidal signal of forward; Otherwise, keeping the T2 conducting, T1 and T4 turn-off, and control T3 switch and then control voltage pulse width can the reverse sinusoidal signals of equivalence.So two groups of IGBT of alternate conduction can realize the inversion to direct current signal.
Said filter circuit (3 ') is made up of inductance and filter capacitor; The output of filter circuit (3 ') links to each other with electrical network; Input links to each other with before inverter circuit (2 '), adds filter circuit and is in order to reduce the output current of inverter, and the raising inverter is exported the quality of electric energy.
Control circuit (4 ') is realized booster circuit (1 ') and inverter circuit (2 ') are controlled.Control chip adopts the high performance digital signal process chip DSP of TI company; It can detect each parameter in the circuit; And then control signal is provided; Circuit is controlled, mainly comprised drive signal that switching element T 0 is opened and turn-offed in the control booster circuit and the pwm signal of controlling T1 ~ T4 in the inverter circuit.
Fig. 5 is the circuit structure diagram of control circuit (4 '), is core with dsp chip TMS320LF2406, and it has abundant memory space and Peripheral Interface, can satisfy the design's needs.ADC0 ~ the ADC15 of dsp chip is used for receiving the detection to dc voltage, DC side electric current, AC side voltage and ac-side current.Four road pwm control signals of the PWM1 of dsp chip ~ PWM4 output control inverter bridge.
Characteristics of the present invention are:
1), the IGBT short-circuit protection realizes powerful IGBT abnormal condition protection with owing drive feedback compensation, the optical fiber encoding and decoding technique that IGBT drives with protection improves the antijamming capability of system under big electric current; Utilize the integrated morphology of noninductive bus row and high life thin-film capacitor to reduce the impact of di/dt and du/dt, highly reliable, the low-loss of realization high power contravariant device and long-life.
2), low pressure input (V
Dc<40V), big step-up ratio (1:8), efficient conversion (; 98.5%), the DCDC circuit design technique of low ripple is broken through the global problem of photovoltaic generating system in the BIPV applications, the fail safe of raising system.
3), utilize DSP embedded system+FPGA association treatment technology make up out 32 high accuracy triple modular redundant SVPWM space vectors calculate, be incorporated into the power networks low harmonic wave control with repeat to control, the hardware association treatment technology of core algorithms such as the quick MPPT tracking of high accuracy; Realized the important breakthrough of digital control system real-time, high reliability, reached advanced world standards.
4), the idle disturbance active detecting of M sequence+passive algorithm that detects; Turn-off with the level two protection system of switch disjunction tactful in conjunction with IGBT; Make system in 900ms, accomplish island detection and protection response, cut off being connected of electrical network and photovoltaic generating system, effectively solve anti-isolated island be controlled in the practical applications blind area greatly, response speed waits the bottleneck technical barrier slowly; Performance is higher than specification requirements such as UL1741, DIN0126, reaches the advanced international standard of anti-isolated island control.
5), the calm control technology of distributed photovoltaic grid-connected system and dispersion self-discipline regulation technology; Solve DC bus-bar voltage fluctuation or vibration altogether; And technical barrier such as inverter output current harmonic content increase, realize the operation control of the distributed connecting system high stability of dc bus.
Claims (7)
1. a photovoltaic DC-to-AC converter comprises control board (1), and base plate (2) and base (3) is characterized in that: said base plate (2) is installed on the base (3), and control board (1) is installed on the base plate (2); Said control board (1) is core with the dsp chip, links to each other with base plate (2) through data wire, through after the light-coupled isolation; Produce pwm control signal, base (3) is a radiator, when inverter is worked, plays a protective role; The circuit of inverter comprises booster circuit (1 '), inverter circuit (2 '), filter circuit (3 ') and control circuit (4 '); Wherein booster circuit (1 ') is connected with inverter circuit (2 '); Inverter circuit (2 ') is connected with filter circuit (3 '), and control circuit (4 ') connects inverter circuit (2 ') and break-make through the control switch device, and the process of inversion is controlled; The alternating current of output supplies to be incorporated into the power networks or household appliances uses.
2. according to claims 1 described photovoltaic DC-to-AC converter, it is characterized in that: control board (1) is an acp chip with TMS320LF2406, comprises the serial communication interface module, Serial Peripheral Interface (SPI) module, CAN controller module, AD module; Input current, the voltage of control board (1) through sampling is obtained, output current, voltage, the comparing element in the task manager of chip internal provides control signal to base plate (2) after handling.
3. according to claims 1 described photovoltaic DC-to-AC converter, it is characterized in that: base plate (2) comprises accessory power supply, light-coupled isolation (6) and strong power part, realizes controlling forceful electric power with light current through light-coupled isolation (6), produces the PWM drive signal of four road IGBT.
4. according to claims 1 described photovoltaic DC-to-AC converter, it is characterized in that: booster circuit (1 ') adopts BOOST booster circuit commonly used, through the opening and break off the change duty ratio of power controlling device, with boost in voltage to 150V-550V; In addition, through detection to the output voltage and the electric current of photovoltaic module, the maximal power tracing of DSP technology, under different temperatures and sunshine condition, the power output of maximum possible seizure photovoltaic module.
5. according to claims 1 described photovoltaic DC-to-AC converter, it is characterized in that: inverter circuit (2 ') is the voltage-type full bridge inverter, and the switching device of use is IGBT.
6. according to claims 1 described photovoltaic DC-to-AC converter, described filter circuit (3 ') is made up of inductance and filter capacitor, and the output of filter circuit (3 ') links to each other with electrical network, and input links to each other with before inverter circuit (2 ').
7. according to claims 1 described photovoltaic DC-to-AC converter, described control circuit (4 ') is a core with the dsp chip TMS320LF2406 that TI company produces.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101739986A CN102710164A (en) | 2012-05-31 | 2012-05-31 | Photovoltaic inverter |
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|---|---|---|---|
| CN2012101739986A CN102710164A (en) | 2012-05-31 | 2012-05-31 | Photovoltaic inverter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293983A (en) * | 2013-06-06 | 2013-09-11 | 无锡杰尔迅科技有限公司 | Anti-reflux domestic photovoltaic inverter |
| US9065336B2 (en) | 2013-06-26 | 2015-06-23 | Industrial Technology Research Institute | Maximum power point tracking method and apparatus |
| CN108169596A (en) * | 2017-12-22 | 2018-06-15 | 湖南科比特新能源科技股份有限公司 | A kind of calibration system of photovoltaic DC-to-AC converter input current channel and the method calibrated using the calibration system |
| CN111245359A (en) * | 2020-01-20 | 2020-06-05 | 上海发电设备成套设计研究院有限责任公司 | Cascaded photovoltaic inverter unit module device and control method |
| CN111239642A (en) * | 2018-11-28 | 2020-06-05 | 广东威灵汽车部件有限公司 | Inverter fault detection method, system and storage medium |
| CN115244839A (en) * | 2020-03-24 | 2022-10-25 | 弗罗纽斯国际有限公司 | Method for operating an inverter and inverter for carrying out the method |
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| CN102005772A (en) * | 2009-08-31 | 2011-04-06 | 比亚迪股份有限公司 | Network combination inversion system and control method thereof |
| CN201821285U (en) * | 2010-09-21 | 2011-05-04 | 山东博奥斯电源有限公司 | DSP (digital signal processor) control grid-connected photovoltaic inverter |
| CN102412758A (en) * | 2011-11-18 | 2012-04-11 | 中国南方航空工业(集团)有限公司 | Portable solar power supply system |
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| CN102005772A (en) * | 2009-08-31 | 2011-04-06 | 比亚迪股份有限公司 | Network combination inversion system and control method thereof |
| CN201821285U (en) * | 2010-09-21 | 2011-05-04 | 山东博奥斯电源有限公司 | DSP (digital signal processor) control grid-connected photovoltaic inverter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293983A (en) * | 2013-06-06 | 2013-09-11 | 无锡杰尔迅科技有限公司 | Anti-reflux domestic photovoltaic inverter |
| US9065336B2 (en) | 2013-06-26 | 2015-06-23 | Industrial Technology Research Institute | Maximum power point tracking method and apparatus |
| CN108169596A (en) * | 2017-12-22 | 2018-06-15 | 湖南科比特新能源科技股份有限公司 | A kind of calibration system of photovoltaic DC-to-AC converter input current channel and the method calibrated using the calibration system |
| CN111239642A (en) * | 2018-11-28 | 2020-06-05 | 广东威灵汽车部件有限公司 | Inverter fault detection method, system and storage medium |
| CN111245359A (en) * | 2020-01-20 | 2020-06-05 | 上海发电设备成套设计研究院有限责任公司 | Cascaded photovoltaic inverter unit module device and control method |
| CN115244839A (en) * | 2020-03-24 | 2022-10-25 | 弗罗纽斯国际有限公司 | Method for operating an inverter and inverter for carrying out the method |
| CN115244839B (en) * | 2020-03-24 | 2023-03-24 | 弗罗纽斯国际有限公司 | Method for operating an inverter and inverter for carrying out the method |
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Application publication date: 20121003 |