CN109768726A - It is a kind of can under illumination bad condition efficiency operation solar inverter - Google Patents
It is a kind of can under illumination bad condition efficiency operation solar inverter Download PDFInfo
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- CN109768726A CN109768726A CN201711079306.0A CN201711079306A CN109768726A CN 109768726 A CN109768726 A CN 109768726A CN 201711079306 A CN201711079306 A CN 201711079306A CN 109768726 A CN109768726 A CN 109768726A
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Abstract
It is a kind of can under illumination bad condition efficiency operation solar inverter, including the mixing DCDC booster converter, full-bridge inverter, low-pass filter, grid-connected conditions detection device, isolation circuit and the microcontroller that are made of push-pull converter and flyback converter and gate drive circuit.The present invention can mix DCDC boost converter topology structure by adjusting, and work normally under illumination condition unfavorable condition；MPPT function, system effectiveness, which are effectively improved, to be realized to more wide input voltage range；There is smaller switching loss, booster converter efficiency is improved.
Description
Technical field
The present invention relates to field of solar thermal power generation, especially one kind can work under illumination bad condition, has mixing
The high-efficiency solar inverter of DCDC booster converter.
Background technique
With getting worse for global energy crisis and problem of environmental pollution, solar energy is inexhaustible with its,
The advantages that cleanliness without any pollution, has obtained great concern and development.It is excessive or insufficient by intensity of illumination in solar panel
When, current inverter efficiently cannot can not even complete boosting inversion function, and the booster circuit part work in inverter exists
More inefficient, the fainter solar irradiation energy of a part is unable to get effective use.
A kind of " topological structure of wide DC input and high-voltage alternating output photovoltaic DC-to-AC converter " (application number
201410486896) topological structure for disclosing a kind of photovoltaic DC-to-AC converter can be realized the wide model of high-power photovoltaic inverter
Direct current input is enclosed, the generating efficiency of a whole set of photovoltaic system is improved；A kind of " self-adjustable integral solar energy road in inclination angle
Lamp " (application number 201710671764) disclose a kind of integral solar energy street lamp, the top of integrated lamp can be made always
The sun is faced, more solar radiation energy are received.Solar inverter disclosed in above-mentioned document is work in illumination item
In the good situation of part, but when illumination condition is bad, inverter working efficiency is low or even can not work." one kind may be implemented point
The centralized photovoltaic generating system of cloth MPPT " (application number 201710271329) disclose and may be implemented distributed MPPT's
Centralized photovoltaic generating system can make photovoltaic array realize that power maximizes, solve the problems, such as communication mismatch, but due to system
It can not work normally when illumination condition is bad, realize that MPPT envelop of function is small, reduce system effectiveness.As it can be seen that domestic current
Inverter can not work when existing solar inverter has the disadvantage that 1. illumination deficiency.Booster converter is opened up in inverter
General fixation is flutterred, can only be boosted for high-line input voltage, effective boosting is unable to reach for rear to low input
Grade inverter work, is unable to get light energy and maximally utilizes.2. realizing MPPT function only in smaller input voltage range
It is interior.For existing solar inverter in intensity of illumination deficiency, solar panel output voltage is small, and inverter can not normal work
Make, booster converter only realizes MPPT function to input voltage in smaller range.3. booster converter function in solar inverter
Consumption is big.When transformer turns ratio is smaller in existing booster converter, voltage class needed for inverter can not be boosted to；And transformer
When the turn ratio is larger, switching device duty ratio is in compared with low state, to guarantee that output is not too high to contravarianter voltage grade.Switch
Pipe works when compared with low duty ratio, and switching current peak value is higher, and power consumption is big at this time.
Summary of the invention
In order to overcome the shortcomings of existing solar inverter, the purpose of the present invention is to provide one kind can be in the bad item of illumination
The solar inverter of efficiency operation under part.Boosting inversion function can be still realized, i.e., to more in intensity of illumination deficiency
The input voltage of wide scope realizes MPPT function, efficient completion boosting inversion function.
To achieve the above object, the technical solution adopted by the present invention is that:
Can under illumination bad condition efficiency operation solar inverter, comprising: by push-pull converter and flyback converter
The mixing DCDC booster converter of composition, full-bridge inverter, low-pass filter, grid-connected conditions detection device, isolation circuit, and
Microcontroller and gate drive circuit.
The mixing DCDC booster converter is made of traditional push-pull converter plus flyback converter, mixing
What DCDC booster converter exported is the summation of above two converter voltage output.Become using this novel mixing DCDC boosting
Parallel operation, when illumination condition is good, the transformer work that the low turn ratio can be used in push-pull converter subtracts under high duty ratio mode
Small-power loss；When illumination condition is bad, solar panel output voltage is reduced, and push-pull converter, which works independently, to boost
To voltage class needed for full-bridge inverter, flyback converter is started to work to ensure that inverter has sufficiently high input voltage.
The full-bridge inverter receives the output voltage of mixing DCDC booster converter, is exchange by its inversion output
Electricity is output to power grid by low-pass filter, and receives the mains voltage signal of grid-connected conditions detection device feedback output, makes inverse
It is consistent with network voltage to become device output voltage amplitude phase.The alternating voltage that the low-pass filter exports full-bridge inverter
It is filtered, so as to grid-connected connection.
The grid-connected conditions detection device can detecte direct current source voltage waveform and grid side voltage waveform.Work
In the grid-connected conditions detection device of direct current source, DC power signal is detected and is fed back, is output to microcontroller through isolation circuit
Device.It works in the grid-connected conditions detection device of grid side, detects the information such as the amplitude phase of grid ac voltage waveform, a part
Full bridge inverter is fed back to, so that it is adjusted output voltage amplitude consistent with grid voltage amplitude phase；Another part export to
Isolation circuit is output to microcontroller by isolation circuit, to realize closed-loop control.
The isolation circuit is to isolate main circuit and control circuit, while by DC power signal and grid-connected conditions
Detection device signal is transferred in digital microcontroller.The microcontroller is the control core of entire inverter, according to defeated
Enter DC power supply and output voltage waveforms situation, be controlled by it mixing DCDC booster converter, sets its work and recommending transformation
Device works independently mode or push-pull converter and flyback converter work in combination mode.DC power supply waveform is obtained according to feedback
With inverter output voltage waveform, the pwm signal duty ratio for being output to gate drive circuit is adjusted, adjustment mixing DCDC boosting becomes
The voltage magnitude of parallel operation output, and MPPT function is realized to the voltage that solar panel issues.
The gate drive circuit, according to the pwm control signal that microcontroller exports, driving mixing DCDC boosting inverter
The switching tube of device realizes the control of high frequency on-off.
Due to using the technology described above, the present invention has the advantages that compared with prior art
1. of the invention the solar inverter of efficiency operation can have when illumination condition is bad under illumination bad condition
Function can be still worked normally, inverter operating mode can be automatically switched for different illumination conditions, expand the work model of inverter
It encloses, the energy being radiated on solar panel is used more effectively.
2. of the invention the solar inverter of efficiency operation can have to wider input electricity under illumination bad condition
The MPPT function of range is pressed, flexible inversion topological structure of boosting can carry out the low-voltage that solar panel exports effective
Boosting inversion function, widen the input voltage range that MPPT function may be implemented.
3. of the invention can have smaller power consumption by the solar inverter of efficiency operation under illumination bad condition, by
In taking flexible boost topology, the switching tube in booster converter can always work at higher duty cycle mode,
Reduce the power consumption of booster converter, efficiency is effectively improved.
(4) Detailed description of the invention
Fig. 1 be can under illumination bad condition the solar inverter of efficiency operation design function block diagram；
Fig. 2 is that can connect topology by the mixing transformation device of the solar inverter of efficiency operation under illumination bad condition.
(5) specific embodiment
To be best understood from technical solution of the present invention, below in conjunction with attached drawing to the working principle of the invention and embodiment make into
The description of one step.
As shown in Figure 1 for can under illumination bad condition the solar inverter of efficiency operation design function box
Figure, solar inverter of the invention is mainly by mixing DCDC booster converter, full-bridge inverter, low-pass filter, grid-connected item
Part detection device, isolation circuit, microcontroller and the big link of gate drive circuit seven are constituted.Wherein, solar panel receives
The direct current of illumination output connects full-bridge inverter, exports after low-pass filtered device filtering after mixing DCDC booster converter
To power grid；Grid-connected conditions detection device detects direct current source voltage waveform and grid side voltage waveform, is isolated through isolation circuit
After be conveyed to microcontroller；Gate drive circuit receives the pwm signal of microcontroller output, driving mixing dcdc converter.
Be illustrated in figure 2 the mixing transformation device of the solar inverter of efficiency operation can connect under illumination bad condition
Topology.Microcontroller synthesizes and coordinates invertor operation as control core, can be according to light conditions and grid side voltage waveform
The work topological structure of the DCDC booster converter of adjustment mixing at any time and the duty ratio of switching device, to reach to light energy
Effective use and reduce the too low bring power consumption of duty ratio.DCDC booster converter is mixed by push-pull converter and inverse-excitation converting
Device, which links together, carries out boosting inverter, and push-pull converter works always, and flyback converter is in push-pull converter output voltage
When insufficient, just start to devote oneself to work to guarantee that full-bridge inverter there are enough voltage class to input.Full-bridge inverter will boost
Direct current afterwards carries out inversion, and output carries out grid-connected after low-pass filter filters.Grid-connected conditions detection device detects inversion
Device output wave
Shape information is transferred to full-bridge inverter and isolation circuit by shape.Main circuit and control circuit are isolated by isolation circuit,
DC power signal and grid-connected conditions detection device signal are transferred in digital microcontroller simultaneously, to realize closed loop feedback control
System.Gate drive circuit receives the pwm signal that microcontroller issues, and the switching tube of driving mixing dcdc converter carries out effective
On-off control, realizes boost function.
It is described can there are two types of operating modes for the solar inverter tool of efficiency operation under illumination bad condition.First
Kind operating mode, under illumination condition good situations, microcontroller control mixing DCDC booster converter work is recommended only
The topological structure of converter work.Illumination is sufficient, and solar panel exports sufficiently high DC voltage, is only become at this time by recommending
Parallel operation work is just enough voltage class needed for boosting to full-bridge inverter；Microcontroller can opening by control push-pull converter
Pipe on-off is closed, realizes MPPT function, and switching tube work at this time reduces switching loss in duty ratio higher mode.Second
Kind operating mode, under illumination condition unfavorable condition, push-pull converter, which works independently, can not increase voltage to full-bridge inverter institute
Voltage class is needed, two booster converters in microcontroller control mixing DCDC booster converter work at the same time.The liter of formation
The low-voltage that pressure topology can export solar panel is effectively promoted to voltage class needed for full-bridge inverter, improves luminous energy
Utilization rate；The switching tube of push-pull converter and flyback converter can be controlled by microcontroller, be worked in duty ratio higher mode,
Reduce switching loss, improves system effectiveness.The function of full-bridge inverter is consistent with the first operating mode.Grid-connected conditions inspection
It surveys device and acquires direct current source voltage waveform information, microcontroller is transferred to after being isolated；Detect grid side voltage waveform letter
Breath, one is transferred to full bridge inverter, and another part is transferred to microcontroller through isolation circuit.Microcontroller integrated treatment is straight
Galvanic electricity Source side voltage signal and grid side voltage signal drive through gate drive circuit and mix by adjusting the pwm signal of output
The switching tube of DCDC booster converter is realized and stablizes boosting and MPPT function.
In conclusion the present invention can mix DCDC boost converter topology structure by adjusting, in the bad feelings of illumination condition
It is worked normally under condition；MPPT function, system effectiveness, which are effectively improved, to be realized to more wide input voltage range；Have smaller
Switching loss, booster converter efficiency are improved.
Claims (3)
1. one kind can under illumination bad condition efficiency operation solar inverter, which is characterized in that the inverter packet
It includes: the mixing DCDC booster converter that is made of push-pull converter and flyback converter, full-bridge inverter, low-pass filter, simultaneously
Net sync detection device, isolation circuit and microcontroller and gate drive circuit.
2. it is according to claim 1 can under illumination bad condition efficiency operation solar inverter, feature exists
In: mixing DCDC booster converter is made of push-pull converter and flyback converter, when illumination condition is good, only recommends transformation
Device work；When illumination is bad, two converters are worked at the same time, and complete boost function.
3. it is according to claim 1 can under illumination bad condition efficiency operation solar inverter, feature exists
The range for realizing MPPT function is widened in: increased flyback converter, solar energy can still be efficiently used when illumination deficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711079306.0A CN109768726A (en) | 2017-11-06 | 2017-11-06 | It is a kind of can under illumination bad condition efficiency operation solar inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711079306.0A CN109768726A (en) | 2017-11-06 | 2017-11-06 | It is a kind of can under illumination bad condition efficiency operation solar inverter |
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| CN102856926A (en) * | 2012-09-12 | 2013-01-02 | 福州大学 | Integrated magnetics based interleaved flyback micropower grid-connected inverter |
| CN202712871U (en) * | 2012-05-14 | 2013-01-30 | 厦门镁尔捷能源技术有限公司 | Integrated alternating current grid-connected solar power generation system |
| CN202713179U (en) * | 2012-03-30 | 2013-01-30 | 德信泰和（北京）科技股份有限公司 | Double-transformer series resonance type miniature photovoltaic inverter |
| CN103956924A (en) * | 2014-04-23 | 2014-07-30 | 苏州微盛特变新能源科技有限公司 | Double-flyback resonant photovoltaic micro inverter |
| CN203896210U (en) * | 2014-01-26 | 2014-10-22 | 全天自动化能源科技（东莞）有限公司 | Mini-sized grid-connected inverter |
| CN204046457U (en) * | 2014-08-11 | 2014-12-24 | 西安后羿半导体科技有限公司 | A kind of combining inverter |
| CN206452299U (en) * | 2016-12-30 | 2017-08-29 | 上海联影医疗科技有限公司 | A kind of converter |
-
2017
- 2017-11-06 CN CN201711079306.0A patent/CN109768726A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6600376B1 (en) * | 2002-08-23 | 2003-07-29 | Entrust Power Co., Ltd. | High efficiency power amplifier |
| CN101834539A (en) * | 2010-05-27 | 2010-09-15 | 浙江大学 | High-efficiency AC/DC combined converter with wide output voltage range |
| CN102801179A (en) * | 2011-05-26 | 2012-11-28 | 武汉金天新能源科技有限公司 | Photovoltaic grid-connected micro-inverter system |
| CN202713179U (en) * | 2012-03-30 | 2013-01-30 | 德信泰和（北京）科技股份有限公司 | Double-transformer series resonance type miniature photovoltaic inverter |
| CN202712871U (en) * | 2012-05-14 | 2013-01-30 | 厦门镁尔捷能源技术有限公司 | Integrated alternating current grid-connected solar power generation system |
| CN102856926A (en) * | 2012-09-12 | 2013-01-02 | 福州大学 | Integrated magnetics based interleaved flyback micropower grid-connected inverter |
| CN203896210U (en) * | 2014-01-26 | 2014-10-22 | 全天自动化能源科技（东莞）有限公司 | Mini-sized grid-connected inverter |
| CN103956924A (en) * | 2014-04-23 | 2014-07-30 | 苏州微盛特变新能源科技有限公司 | Double-flyback resonant photovoltaic micro inverter |
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Application publication date: 20190517 |