CN102931861A - High-efficiency multisource photovoltaic inverter - Google Patents
High-efficiency multisource photovoltaic inverter Download PDFInfo
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- CN102931861A CN102931861A CN2011102310460A CN201110231046A CN102931861A CN 102931861 A CN102931861 A CN 102931861A CN 2011102310460 A CN2011102310460 A CN 2011102310460A CN 201110231046 A CN201110231046 A CN 201110231046A CN 102931861 A CN102931861 A CN 102931861A
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Abstract
The invention relates to a high-efficiency multisource photovoltaic inverter, which comprises an inverter box body, wherein a box cover is arranged on the inverter box body. The high-efficiency multisource photovoltaic inverter is characterized in that a conversion photovoltaic array assembly is arranged in the inverter box body, a processing terminal of the conversion photovoltaic array assembly is respectively connected with a voltage reduction assembly and a voltage boosting assembly; a converter is arranged at the input end of the voltage reduction assembly; a connection terminal of the voltage reduction assembly and the voltage boosting assembly is connected with an inversion conversion module; and a power grid connecting terminal is arranged on the connecting end of the inversion conversion module. The high-efficiency multisource photovoltaic inverter can be used for various photovoltaic arrays and alternative energy resources and avoids switching loss; and if the voltage of the photovoltaic arrays is higher than that of a power grid, a circuit works independently like a voltage reduction converter. If the voltage of the photovoltaic arrays is lower than the voltage of the power grid, the voltage boosting circuit works in synchronization with the voltage reduction converter, and therefore the voltage of the voltage reduction converter is always higher than that of the power grid. Through special selection on the conversers, the high-efficiency multisource photovoltaic inverter has the capability of further improving the efficiency.
Description
Technical field
The present invention relates to a kind of inverter, relate in particular to a kind of high-efficient multi-source photovoltaic inverter.
Background technology
Photovoltaic (PV) battery produces direct current usually, and electric current degree (DC) depends on solar radiation and the galvanic degree relevant with temperature.When alternating current (AC) power supply needed, inverter can change direct current energy into AC energy.Typical photovoltaic DC-to-AC converter uses the energy in two stages to process, and the phase I provides a constant direct voltage, the converting direct-current voltage into alternating-current voltage that second stage is constant with it.Usually the phase I comprises a boost converter, and second stage comprises the inversion system of a single-phase or three-phase, and the transfer ratio of two stage inverters is important parameters that have influence on the photovoltaic system performance.Each stage can cause half the loss of this stage photovoltaic system usually.Single-phase photovoltaic DC-to-AC converter needs two stages to turn the circuit of pressure usually, so that the unsettled direct voltage that solar cell is sent converts the alternating voltage of fixed frequency in the electrical network to.Traditional photovoltaic DC-to-AC converter uses dc bus as the intermediate steps of energy storage, it means that the unsettled voltage transitions that this transducer at first produces the photovoltaic solar the subject of knowledge and the object of knowledge is that galvanic current is pressed, and then is converted to the alternating voltage that can directly be connected to the grid with this burning voltage.
Traditional single-phase photovoltaic DC-to-AC converter uses fixing switching frequency control circuit, use a plurality of (generally being five) conversion equipment, these conversion equipments cause energy losses a large amount of in the conversion process jointly, usually use the low inverter of inversion frequency so that energy consumption reduces as far as possible.
Summary of the invention
Purpose of the present invention is exactly in order to solve the above-mentioned problems in the prior art, and a kind of high-efficient multi-source photovoltaic inverter is provided.
Purpose of the present invention is achieved through the following technical solutions:
High-efficient multi-source photovoltaic inverter, include the inverter box body, be provided with lid on the described inverter box body, wherein: be provided with the conversion photovoltaic array component in the described inverter box body, the processing terminal of described conversion photovoltaic array component is connected with respectively down block and boosts assembly; The input of described down block is provided with transducer; Described down block has the inversion modular converter with the cohesive end sub-connection of the assembly that boosts, and is provided with electrical network on the link of described inversion modular converter and is connected terminal.
Above-mentioned high-efficient multi-source photovoltaic inverter, wherein: described down block includes main diode (led) module, the output of described main diode (led) module is connected with the waveform inductor module, and the output of described waveform inductor module is connected into the inversion modular converter by being connected terminal.
Further, above-mentioned high-efficient multi-source photovoltaic inverter, wherein: on the described waveform inductor module ripple current cancellation element is installed.
Further, above-mentioned high-efficient multi-source photovoltaic inverter, wherein: the described assembly that boosts includes the boost current switch module, and the control end of described boost current switch module is connected with the boost inductor module, and the output of described boost inductor module is connected with from diode (led) module.
Further, above-mentioned high-efficient multi-source photovoltaic inverter, wherein: be connected with the auxiliary capacitor module on the described conversion photovoltaic array component.
Further, above-mentioned high-efficient multi-source photovoltaic inverter, wherein: described transducer is that the high frequency voltage descending switch is made assembly.
Further, above-mentioned high-efficient multi-source photovoltaic inverter, wherein: be connected with the oscillography module on the described inversion modular converter.
Further, above-mentioned high-efficient multi-source photovoltaic inverter, wherein: be provided with the module fixed head in the described inverter box body.
Further, above-mentioned high-efficient multi-source photovoltaic inverter, wherein: be provided with radiating subassembly in the described inverter box body; Described radiating subassembly includes radiator, on the described radiator fan is installed.
Again further, above-mentioned high-efficient multi-source photovoltaic inverter, wherein: the side plate of described inverter box body is distributed with louvre.
The advantage of technical solution of the present invention is mainly reflected in: can be used for multiple Photovoltaic array and the alternative energy.Photovoltaic DC-to-AC converter produces sinusoidal current and is directly proportional with line voltage, has represented high-power one side.When only having a power semiconductor device to change under high-frequency very, other device will be realized in electrical network that high frequency transforms and can obtain high efficient.Sine-wave current of main switching device shifter generation of step-down controller is incorporated in the electrical network to be stored.Avoided switching loss, because in the switch transition phase, by electric current and the voltage approaching zero of device.If photovoltaic array voltage is higher than line voltage, circuit works independently the same with step-down controller.If Photovoltaic array voltage is lower than line voltage, booster circuit is followed the step-down controller synchronous working, thereby has guaranteed that step-down controller voltage is always greater than line voltage.The output of full-bridge inverter is never at high band.Through the selection special to conversion equipment, further raising that can implementation efficiency.
Description of drawings
Purpose of the present invention, advantage and disadvantage will be for illustration and explanation by the non-limitative illustration of following preferred embodiment.These embodiment only are the prominent examples of using technical solution of the present invention, and all technical schemes of taking to be equal to replacement or equivalent transformation and forming all drop within the scope of protection of present invention.In the middle of these accompanying drawings,
Fig. 1 is the organigram of high-efficient multi-source photovoltaic inverter;
Fig. 2 is buck-boost switch process schematic diagram;
Fig. 3 is high-efficient multi-source photovoltaic inverter circuit theory schematic diagram.
Embodiment
High-efficient multi-source photovoltaic inverter shown in Fig. 1～3 includes inverter box body 1, is provided with lid on the described inverter box body 1, and its unusual part is: be provided with conversion photovoltaic array component 2 in the inverter box body 1 of the present invention.Specifically, the processing terminal of this conversion photovoltaic array component 2 is connected with respectively down block 3 and boosts assembly 4.Simultaneously, being provided with the high frequency voltage descending switch at the input of down block 3 is transducer 5 as assembly.And down block 3 has inversion modular converter 6 with the cohesive end sub-connection of the assembly 4 that boosts, and is provided with electrical network on the link of described inversion modular converter 6 and is connected terminal 7.
The better execution mode of the present invention one just as shown in Figure 1, in order effectively to avoid the unnecessary loss in the switching process, down block 3 includes main diode (led) module 8, output at main diode (led) module 8 is connected with waveform inductor module 9, and the output of waveform inductor module 9 is connected into inversion modular converter 6 by being connected terminal.Simultaneously, can the ripple current cancellation element be installed at waveform inductor module 9.Like this, having lower own loss has and greatly reduces simultaneously switching loss.
Corresponding is that the assembly 4 that boosts of the present invention includes boost current switch module 14 with it.Specifically, the control end of this boost current switch module 14 is connected with boost inductor module 17, and the output of boost inductor module 17 is connected with from diode (led) module 16.Like this, under certain condition, the current voltage switch module is connected and can be realized postponing, and both by postponing closing of high frequency voltage descending switch module, only has a switch that energy loss is arranged, and other switches without any loss.
Further, for the ease of the facility of follow-up use and adjustment, be connected with oscillography module 11 at inversion modular converter 6.Can allow the commissioning staff know current working condition.Simultaneously, consider and avoid modules unnecessary loosening situation after assembling puts in place, to occur, in inverter box body 1, be provided with module fixed head 10.
Again further, consider after the long-term work to produce certain heat, in order to improve the operating efficiency of parts, simultaneously also in order to slow down the heat ageing that is subjected to of part, in inverter box body 1, be provided with radiating subassembly.Certainly, consider and can improve radiating efficiency, radiating subassembly includes radiator 12, on the described radiator 12 fan 13 is installed.Moreover, can be distributed with louvre at the side plate of inverter box body 1, more be conducive to heat radiation.
In conjunction with actual operating position of the present invention, 4 need of assembly that boost operate when the photovoltaic array component output voltage is lower than the instantaneous voltage of public electric wire net.When the photovoltaic array component output voltage was lower than the utility network instantaneous voltage, booster circuit can be stored into extracurrent in the capacitor from photovoltaic array component.Be the operator scheme that keeps improving, combination voltage passes auxiliary capacitor module 15 provides necessary voltage to go to move down block 3.
Dynamically describe from step-down and boost function, as shown in Figure 2: whenever boost function all can have public electric wire net instantaneous voltage 19 to surpass 220 volts of generations of voltage of the required output of photovoltaic array component.By auxiliary capacitor module 15, exceeding voltage 20 when public electric wire net instantaneous voltage 19 surpasses 220 volts provides voltage to add step-down voltage 18 to allow suitable step-down.Boost converter 5 is not to continue to boost continuously in the whole cycle, thereby reduces to greatest extent because improving photovoltaic array voltage to the adverse effect of efficient.
In conjunction with circuit theory Fig. 3 of actual production of the present invention, it comprises a plurality of reduction voltage circuits again, and each reduction voltage circuit is connected with corresponding DC power supply.Also have a single-phase full bridge circuit unfolding circuits, wherein each reduction voltage circuit produces the full-wave-rectified sinewave electric current of a correspondence in the situation that the step-down controller pattern is moved continuously.And, these a plurality of reduction voltage circuits are provided in together jointly, produced and maybe can produce required full-wave-rectified sinewave electric current, the full-wave-rectified sinewave electric current that this is required is in the situation that a plurality of reduction voltage circuit is resulting by the summation of a plurality of full-wave-rectified sinewave electric currents.When the voltage ratio public electric wire net instantaneous voltage of the DC power supply of correspondence output is low, cooperate by a booster circuit inductor, each DC power supply configures corresponding booster circuit to improve circuit supply voltage degree.
Can find out by above-mentioned character express, behind employing the present invention, can be used for multiple Photovoltaic array and the alternative energy.Photovoltaic DC-to-AC converter produces sinusoidal current and is directly proportional with line voltage, has represented high-power one side.When only having a power semiconductor device to change under high-frequency very, other device will be realized in electrical network that high frequency transforms and can obtain high efficient.Sine-wave current of main switching device shifter generation of step-down controller is incorporated in the electrical network to be stored.Avoided switching loss, because in the switch transition phase, by electric current and the voltage approaching zero of device.If photovoltaic array voltage is higher than line voltage, circuit works independently the same with step-down controller.If Photovoltaic array voltage is lower than line voltage, booster circuit is followed the step-down controller synchronous working, thereby has guaranteed that step-down controller voltage is always greater than line voltage.The output of full-bridge inverter is never at high band.Through the selection special to conversion equipment, further raising that can implementation efficiency.
Claims (10)
1. high-efficient multi-source photovoltaic inverter, include the inverter box body, be provided with lid on the described inverter box body, it is characterized in that: be provided with the conversion photovoltaic array component in the described inverter box body, the processing terminal of described conversion photovoltaic array component is connected with respectively down block and boosts assembly; The input of described down block is provided with transducer; Described down block has the inversion modular converter with the cohesive end sub-connection of the assembly that boosts, and is provided with electrical network on the link of described inversion modular converter and is connected terminal.
2. high-efficient multi-source photovoltaic inverter according to claim 1, it is characterized in that: described down block includes main diode (led) module, the output of described main diode (led) module is connected with the waveform inductor module, and the output of described waveform inductor module is connected into the inversion modular converter by being connected terminal.
3. high-efficient multi-source photovoltaic inverter according to claim 1 is characterized in that: on the described waveform inductor module ripple current cancellation element is installed.
4. high-efficient multi-source photovoltaic inverter according to claim 1, it is characterized in that: the described assembly that boosts includes the boost current switch module, the control end of described boost current switch module is connected with the boost inductor module, and the output of described boost inductor module is connected with from diode (led) module.
5. high-efficient multi-source photovoltaic inverter according to claim 1 is characterized in that: be connected with the auxiliary capacitor module on the described conversion photovoltaic array component.
6. high-efficient multi-source photovoltaic inverter according to claim 1, it is characterized in that: described transducer is that the high frequency voltage descending switch is made assembly.
7. high-efficient multi-source photovoltaic inverter according to claim 1 is characterized in that: be connected with the oscillography module on the described inversion modular converter.
8. high-efficient multi-source photovoltaic inverter according to claim 1 is characterized in that: be provided with the module fixed head in the described inverter box body.
9. high-efficient multi-source photovoltaic inverter according to claim 1 is characterized in that: be provided with radiating subassembly in the described inverter box body; Described radiating subassembly includes radiator, on the described radiator fan is installed.
10. high-efficient multi-source photovoltaic inverter according to claim 1, it is characterized in that: the side plate of described inverter box body is distributed with louvre.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102310460A CN102931861A (en) | 2011-08-12 | 2011-08-12 | High-efficiency multisource photovoltaic inverter |
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| CN2011102310460A CN102931861A (en) | 2011-08-12 | 2011-08-12 | High-efficiency multisource photovoltaic inverter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101594068A (en) * | 2008-05-27 | 2009-12-02 | 通用电气公司 | Efficiently, multi-source photovoltaic inverter |
| CN201821283U (en) * | 2010-09-16 | 2011-05-04 | 徐新华 | Coke-can-shaped inverter |
| CN202261063U (en) * | 2011-08-12 | 2012-05-30 | 苏州绿茵能源科技有限公司 | High-efficient multi-source photovoltaic inverter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101594068A (en) * | 2008-05-27 | 2009-12-02 | 通用电气公司 | Efficiently, multi-source photovoltaic inverter |
| CN201821283U (en) * | 2010-09-16 | 2011-05-04 | 徐新华 | Coke-can-shaped inverter |
| CN202261063U (en) * | 2011-08-12 | 2012-05-30 | 苏州绿茵能源科技有限公司 | High-efficient multi-source photovoltaic inverter |
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Application publication date: 20130213 |