CN104218830A - Wide-range double-stage photovoltaic inverter and method for applying same - Google Patents
Wide-range double-stage photovoltaic inverter and method for applying same Download PDFInfo
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- CN104218830A CN104218830A CN201410425143.7A CN201410425143A CN104218830A CN 104218830 A CN104218830 A CN 104218830A CN 201410425143 A CN201410425143 A CN 201410425143A CN 104218830 A CN104218830 A CN 104218830A
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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 discloses a wide-range double-stage photovoltaic inverter and application thereof. The wide-range double-stage photovoltaic inverter is characterized in that positive and negative input ends of a Boost circuit are respectively connected with positive and negative poles of a photovoltaic array, and direct-current input voltages are sequentially transmitted through a direct-current bus portion, a three-phase bridge inverter and an alternating-current filter and then are outputted. The wide-range double-stage photovoltaic inverter and the application thereof have the advantages that wide-range direct currents can be inputted into the high-power photovoltaic inverter, and accordingly the direct-current voltage utilization rate of the photovoltaic array can be increased; the alternating-current output voltages are increased, so that alternating current and inverter loss and alternating-current line loss can be reduced, in other words, the power generation efficiency of an integral photovoltaic system can be improved, and an economic benefit of a power station can be increased.
Description
Technical field
The invention belongs to field of photovoltaic power generation, particularly a kind of wide region stage type photovoltaic DC-to-AC converter and application process thereof.
Background technology
Along with the change of world energy sources general layout, how the focus that photovoltaic generation day by day becomes various countries' further investigation, greatly develops, make full use of the energy that photovoltaic array is changed, improve photovoltaic conversion efficiency, is the important directions of photovoltaic system research always; Photovoltaic DC-to-AC converter many employings MPPT maximum power point tracking technology (MPPT) of present main flow realizes making full use of of solar energy, even if photovoltaic array always works in the maximum power point under now external environment condition, so that optimum use solar energy.
When some requires lower from net application or inverter output voltage, in order to follow the trail of maximum power point of photovoltaic array, generally increase a Buck buck circuit in direct current input prime and form two-stage topologies, which results in the serious reduction of the voltage utilization when photovoltaic array output voltage is inherently lower, add power loss and electromagnetic interference; Because this Buck circuit is always in running order, not only add hardware cost, increase switch and the on-state loss of semiconductor, also have impact on the generating efficiency in power station, reduce the reliability of whole photovoltaic system.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, a kind of wide region stage type photovoltaic DC-to-AC converter and application process thereof are provided, the wide region direct current input of high-power photovoltaic inverter can be realized, improve photovoltaic array direct voltage utilance, by improving ac output voltage, thus reduce the loss of alternating current and inverter, also reduce alternating current circuit loss, namely improve the generating efficiency of a whole set of photovoltaic system, improve the economic benefit in power station.
In order to solve above technical problem, the invention provides a kind of wide region stage type photovoltaic DC-to-AC converter, comprise DC bus sections, three-phase bridge inverter and alternating current filter, also comprise Boost circuit, the positive and negative input of described Boost circuit connects the positive and negative electrode of photovoltaic array respectively, and DC input voitage is exported after DC bus sections, three-phase bridge inverter and alternating current filter successively.
Technique effect: the present invention can realize the wide region direct current input of high-power photovoltaic inverter, improves photovoltaic array direct voltage utilance, reduces circuit power loss, improve the generating efficiency of a whole set of photovoltaic system; Ac output voltage can be improved a grade, reduce the current class of power device, filter apparatus, copper bar, transformer etc., also for more Multi benefit is created in power station while saving inverter cost.
The technical scheme that the present invention limits further is:
Further, aforesaid wide region direct current input stage type photovoltaic DC-to-AC converter topological structure, the concrete structure of Boost circuit is: positive input terminal be in series with an inductance and after this inductance, connect the anode of a fast recovery diode and the collector electrode of a power switch pipe respectively, negative input end connects the emitter of this power switch pipe, is provided with a charge and discharge capacitance between positive and negative input;
In DC bus sections, one end of positive and negative bus connects the negative electrode of fast recovery diode and the emitter of power switch pipe respectively, one direct current Support Capacitor and a discharge resistance are arranged in parallel between positive and negative bus, another termination three-phase bridge inverter of positive and negative bus.
The present invention have also been devised the application process of a kind of wide region direct current input stage type photovoltaic DC-to-AC converter topological structure, when the output voltage of photovoltaic array is higher, Boost circuit does not work, the direct voltage of photovoltaic array directly enters three-phase bridge inverter, now realizes MPPT power tracking with three-phase bridge inverter;
When the optimum operating voltage of photovoltaic array is lower, Boost circuit is started working, and now three-phase bridge inverter terminal voltage is higher than photovoltaic array terminal voltage, realizes MPPT function by Boost circuit, and DC bus-bar voltage is carried out voltage stabilizing by three-phase bridge inverter and controlled;
When the input optimum operating voltage of photovoltaic array is higher, the loss of Boost circuit reduces to zero.
A kind of wide region stage type photovoltaic DC-to-AC converter designed by the present invention and application process thereof, the wide region direct current input of high-power photovoltaic inverter can be realized, improve photovoltaic array direct voltage utilance, by improving ac output voltage, thus reduce the loss of alternating current and inverter, also reduce alternating current circuit loss, namely improve the generating efficiency of a whole set of photovoltaic system, improve the economic benefit in power station.
Accompanying drawing explanation
The wide region stage type photovoltaic DC-to-AC converter of Fig. 1 designed by the present invention.
Embodiment
embodiment 1
As shown in Figure 1, a kind of wide region stage type photovoltaic DC-to-AC converter that the present embodiment provides, comprise DC bus sections, three-phase bridge inverter and alternating current filter, also comprise Boost circuit, the positive and negative input of described Boost circuit connects the positive and negative electrode of photovoltaic array respectively, and DC input voitage is exported after DC bus sections, three-phase bridge inverter and alternating current filter successively.
Technique effect: the present invention can realize the wide region direct current input of high-power photovoltaic inverter, improves photovoltaic array direct voltage utilance, reduces circuit power loss, improve the generating efficiency of a whole set of photovoltaic system; Ac output voltage can be improved a grade, reduce the current class of power device, filter apparatus, copper bar, transformer etc., also for more Multi benefit is created in power station while saving inverter cost.
Aforesaid wide region direct current input stage type photovoltaic DC-to-AC converter topological structure, the concrete structure of Boost circuit is: positive input terminal be in series with an inductance and after this inductance, connect the anode of a fast recovery diode and the collector electrode of a power switch pipe respectively, negative input end connects the emitter of this power switch pipe, is provided with a charge and discharge capacitance between positive and negative input;
In DC bus sections, one end of positive and negative bus connects the negative electrode of fast recovery diode and the emitter of power switch pipe respectively, one direct current Support Capacitor and a discharge resistance are arranged in parallel between positive and negative bus, another termination three-phase bridge inverter of positive and negative bus.
embodiment 2
Present embodiments provide the application process of a kind of wide region direct current input stage type photovoltaic DC-to-AC converter topological structure, when the output voltage of photovoltaic array is higher, Boost circuit does not work, the direct voltage of photovoltaic array directly enters three-phase bridge inverter, now realizes MPPT power tracking with three-phase bridge inverter;
When the optimum operating voltage of photovoltaic array is lower, Boost circuit is started working, and now three-phase bridge inverter terminal voltage is higher than photovoltaic array terminal voltage, realizes MPPT function by Boost circuit, and DC bus-bar voltage is carried out voltage stabilizing by three-phase bridge inverter and controlled;
When the input optimum operating voltage of photovoltaic array is higher, the loss of Boost circuit reduces to zero.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (3)
1. a wide region stage type photovoltaic DC-to-AC converter, comprise DC bus sections, three-phase bridge inverter and alternating current filter, it is characterized in that, also comprise Boost circuit, the positive and negative input of described Boost circuit connects the positive and negative electrode of photovoltaic array respectively, and DC input voitage is exported after DC bus sections, three-phase bridge inverter and alternating current filter successively.
2. wide region stage type photovoltaic DC-to-AC converter according to claim 1, it is characterized in that, the concrete structure of described Boost circuit is: positive input terminal be in series with an inductance and after this inductance, connect the anode of a fast recovery diode and the collector electrode of a power switch pipe respectively, negative input end connects the emitter of this power switch pipe, is provided with a charge and discharge capacitance between positive and negative input;
In described DC bus sections, one end of positive and negative bus connects the negative electrode of described fast recovery diode and the emitter of power switch pipe respectively, one direct current Support Capacitor and a discharge resistance are arranged in parallel between positive and negative bus, another termination three-phase bridge inverter of described positive and negative bus.
3. the application process of wide region direct current input stage type photovoltaic DC-to-AC converter topological structure according to claim 2, it is characterized in that, when the output voltage of photovoltaic array is higher, Boost circuit does not work, the direct voltage of photovoltaic array directly enters three-phase bridge inverter, now realizes MPPT power tracking with three-phase bridge inverter;
When the optimum operating voltage of photovoltaic array is lower, Boost circuit is started working, and now three-phase bridge inverter terminal voltage is higher than photovoltaic array terminal voltage, realizes MPPT function by Boost circuit, and DC bus-bar voltage is carried out voltage stabilizing by three-phase bridge inverter and controlled;
When the input optimum operating voltage of photovoltaic array is higher, the loss of Boost circuit reduces to zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410425143.7A CN104218830A (en) | 2014-08-27 | 2014-08-27 | Wide-range double-stage photovoltaic inverter and method for applying same |
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| CN201410425143.7A CN104218830A (en) | 2014-08-27 | 2014-08-27 | Wide-range double-stage photovoltaic inverter and method for applying same |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953847A (en) * | 2015-06-29 | 2015-09-30 | 航天长峰朝阳电源有限公司 | Isolated DC/DC (direct current/direct current) power supply module adopting ultra-wide input range and ultra-low output voltage |
| CN104967354A (en) * | 2015-07-22 | 2015-10-07 | 苏州景新电气有限公司 | Photovoltaic inverter and photovoltaic inversion system |
| CN105305953A (en) * | 2015-10-15 | 2016-02-03 | 浙江大学 | High-voltage wide-range photovoltaic inversion structure with reconstruction capability and application thereof |
| 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 |
| CN108899937A (en) * | 2018-09-05 | 2018-11-27 | 阳光电源股份有限公司 | A kind of exchange optimizer system |
| CN109494983A (en) * | 2017-09-13 | 2019-03-19 | 株洲中车时代电气股份有限公司 | A kind of DC converter |
-
2014
- 2014-08-27 CN CN201410425143.7A patent/CN104218830A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953847A (en) * | 2015-06-29 | 2015-09-30 | 航天长峰朝阳电源有限公司 | Isolated DC/DC (direct current/direct current) power supply module adopting ultra-wide input range and ultra-low output voltage |
| CN104967354A (en) * | 2015-07-22 | 2015-10-07 | 苏州景新电气有限公司 | Photovoltaic inverter and photovoltaic inversion system |
| CN105305953A (en) * | 2015-10-15 | 2016-02-03 | 浙江大学 | High-voltage wide-range photovoltaic inversion structure with reconstruction capability and application thereof |
| CN109494983A (en) * | 2017-09-13 | 2019-03-19 | 株洲中车时代电气股份有限公司 | A kind of DC converter |
| 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 |
| CN108899937A (en) * | 2018-09-05 | 2018-11-27 | 阳光电源股份有限公司 | A kind of exchange optimizer system |
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Application publication date: 20141217 |