CN102237824B - Photovoltaic (PV) inverter - Google Patents
Photovoltaic (PV) inverter Download PDFInfo
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- CN102237824B CN102237824B CN2011100972936A CN201110097293A CN102237824B CN 102237824 B CN102237824 B CN 102237824B CN 2011100972936 A CN2011100972936 A CN 2011100972936A CN 201110097293 A CN201110097293 A CN 201110097293A CN 102237824 B CN102237824 B CN 102237824B
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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 (PV) inverter, belonging to the technical field of PV power generation applications. For the purpose of improving the overall conversion efficiency of a PV power generation system, the wide input voltage range and the high conversion efficiency of the inverter are required in a PV grid-connected system. The PV inverter comprises a main controller, a voltage changing and stabilizing circuit, a network-side system under MPPT (maximum power point tracking), an inverse grid-connected system and a solar-cell panel, wherein the voltage changing and stabilizing circuit is utilized to realize requirements of wide-input voltage range; and in the circuit, a double-Boost interleaving grid-connected control technology and a silicon carbide Schottky diode are adopted to improve the voltage bearing capacity of a power switching element and reduce the loss of power elements greatly as well as meet the special requirements of the PV grid-connected system for the inverter. In the inversion part, a high-speed H-bridge IGBT (insulated gate bipolar translator) module is adopted to carry out full-bridge inversion, and an MPPT algorithm is adopted, thus improving the overall conversion efficiency of the PV power generation system and increasing the overall generated energy of the PV power generation system.
Description
Technical field:
The present invention relates to a kind of photovoltaic DC-to-AC converter, belong to the photovoltaic generation applied technical field.
Background technology:
Summary of the invention:
The object of the invention is to provide a kind of photovoltaic DC-to-AC converter, improves the conversion efficiency of electricity generation system, and inverter structure is compact, reduces costs, and solves the problems referred to above that exist in background technology.
technical scheme of the present invention is: a kind of photovoltaic DC-to-AC converter, comprise master controller, voltage transformation and voltage stabilizing circuit, net side system under MPPT maximum power point tracking, the inversion grid connection system, solar panel, master controller DSP28335 chip gathers the dc voltage and current of solar panel, when the solar panel output voltage during lower than 320V, adopt the Boost circuit to realize that DC/DC boosts, the voltage of exporting when cell panel is able to keep DC/AC inversion output requirement, be that the cell panel output voltage is when surpassing 320V, the Boost circuit quits work, solar panel directly by diode to inverter power supply, master controller DSP28335 chip gathers voltage, the electric current of electrical network simultaneously, according to the MPPT maximum power point tracking algorithm, calculates current controlled quentity controlled variable, and drive high speed H bridge IGBT module and carry out inversion, and AC energy input electrical network.
Voltage transformation and voltage stabilizing circuit are realized the requirement of wide input voltage range, adopt two Boost crisscross parallel control technologys and silicon carbide schottky diode not only to improve device for power switching voltage ability to bear in circuit, also significantly reduce the loss of power device, satisfied the specific (special) requirements of photovoltaic parallel in system to inverter; The inversion grid connection system adopts high speed H bridge IGBT module full-bridge inverting, and adopts the MPPT maximum power point tracking algorithm, has improved the whole conversion efficiency of photovoltaic generation, has increased and decreased the whole energy output of photovoltaic generating system.
The invention has the beneficial effects as follows: photovoltaic DC-to-AC converter uses the DSP28335 chip as master controller, adopt wide input voltage working range and MPPT maximum power point tracking to control the control algolithm that (MPPT) combines, grid-connected photovoltaic system can be shone under the illumination unfavorable conditions at low light still can track fast the maximum power working point of photovoltaic array, increase conversion efficiency and the operating time of electricity generation system, thereby improved the whole efficiency of photovoltaic generating system.Main circuit adopts high speed H bridge IGBT module full-bridge inverting, has reduced the filter inductance value, thereby the filter inductance volume is reduced, and not only makes inverter structure compact, and has reduced cost.
Description of drawings:
Fig. 1 is figure main program flow schematic diagram of the present invention;
Fig. 2 is photovoltaic DC-to-AC converter structure composition diagram;
Embodiment:
Below in conjunction with accompanying drawing, the invention will be further described by embodiment.
in an embodiment, a kind of photovoltaic DC-to-AC converter, comprise master controller, voltage transformation and voltage stabilizing circuit, net side system under MPPT maximum power point tracking, the inversion grid connection system, solar panel, master controller DSP28335 chip gathers the dc voltage and current of solar panel, when the solar panel output voltage during lower than 320V, adopt the Boost circuit to realize that DC/DC boosts, the voltage of exporting when cell panel is able to keep DC/AC inversion output requirement, be that the cell panel output voltage is when surpassing 320V, the Boost circuit quits work, solar panel directly by diode to inverter power supply, master controller DSP28335 chip gathers voltage, the electric current of electrical network simultaneously, according to the MPPT maximum power point tracking algorithm, calculates current controlled quentity controlled variable, and drive high speed H bridge IGBT module and carry out inversion, and AC energy input electrical network.
Photovoltaic DC-to-AC converter adopts the DSP28335 chip as master controller, and control section has following function:
1) voltage transformation and voltage stabilizing
Master controller gathers the DC input voitage of solar panel, when the solar panel output voltage during lower than 320V, adopt the Boost circuit to realize that DC/DC boosts, the voltage of exporting when cell panel is able to keep DC/AC inversion output requirement, be that the cell panel output voltage is when surpassing 320V, the Boost circuit quits work, solar panel directly by diode to inverter power supply.In order to reduce the DC side ripple current, reduce dc bus capacitor, the Boost circuit adopts two Boost crisscross parallel control technologys, make wide input voltage range, conversion efficiency is high, can also reduce the harmonic content in output waveform simultaneously, reduce ripple, reduce the filtering device volume; Isolating diode adopts the silicon carbide schottky diode, not only improved device for power switching voltage ability to bear, also significantly reduced the loss of power device, satisfied the specific (special) requirements of photovoltaic parallel in system to inverter, improve the whole conversion efficiency of photovoltaic generation, increased and decreased the whole energy output of photovoltaic generating system.
2) parallel network reverse under MPPT maximum power point tracking
Step (1). with microprocessor as the MPPT maximum power point tracking controller in the formation circuit of controlling width-modulation pulse in photovoltaic generating system independently or parallel networking type photovoltaic electricity generation system, detect the output voltage V n of solar cell photovoltaic array in described photovoltaic generating system, output current In;
Step (2). the output voltage sampled value Vp's of this microprocessor calculating current output voltage Vn and a upper control cycle is poor
, and output current Ip poor of calculating current output current In and a upper control cycle
, and judgement:
If,
=0,
, judgement
Whether equal 0,
If,
≠ 0,
, judgement
Whether equal 0;
Step (3). according to the judged result of step (2):
If,
=0,, Vp=Vn, Ip=In returns;
If,
=0,
, Vp=Vn, Ip=In returns;
Step (4). according to the judged result of step (3):
If,
≠ 0,
, judgement
＞0,
If,
≠ 0,
, judgement
＞0 is no;
Step (5): according to the judged result of step (4):
If,
＞0,
, reduce linearly the value of the reference current Iref of this microprocessor output, regulate PWM and drive signal, until Vp=Vn, Ip=In returns;
If,
＜0,
, increase linearly the value of the reference current Iref of this microprocessor output, regulate PWM and drive signal, until Vp=Vn, Ip=In returns;
If,
＞0,
, reduce linearly the value of the reference current Iref of this microprocessor output, regulate PWM and drive signal, until Vp=Vn, Ip=In returns;
If,
＜0,
, increase linearly the value of the reference current Iref of this microprocessor output, regulate PWM and drive signal, until Vp=Vn, Ip=In returns.
The method is regulated the active current of photovoltaic combining inverter output by the compensating action of PI under synchronous coordinate system
Real-time tracking through the given reference current Iref of MPPT algorithm so that the photovoltaic array steady operation in maximum power point, the output current that is incorporated into the power networks is synchronizeed with line voltage (power factor is 1) fully, certainly also can realize no-power compensation function according to the requirement of local load.
Main circuit adopts high speed H bridge IGBT module full-bridge inverting, has reduced the filter inductance value, thereby the filter inductance volume is reduced, and not only makes inverter structure compact, and has reduced cost.
Claims (1)
1. photovoltaic DC-to-AC converter, it is characterized in that comprising master controller, voltage transformation and voltage stabilizing circuit, net side system under MPPT maximum power point tracking, the inversion grid connection system, solar panel, master controller DSP28335 chip gathers the dc voltage and current of solar panel, when the solar panel output voltage during lower than 320V, adopt the Boost circuit to realize that DC/DC boosts, the voltage of exporting when cell panel is able to keep DC/AC inversion output requirement, be that the cell panel output voltage is when surpassing 320V, the Boost circuit quits work, solar panel directly by diode to inverter power supply, master controller DSP28335 chip gathers voltage, the electric current of electrical network simultaneously, according to the MPPT maximum power point tracking algorithm, calculates current controlled quentity controlled variable, and drive high speed H bridge IGBT module and carry out inversion, and AC energy input electrical network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100972936A CN102237824B (en) | 2010-12-30 | 2011-04-19 | Photovoltaic (PV) inverter |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010613416.2 | 2010-12-30 | ||
| CN201010613416 | 2010-12-30 | ||
| CN2011100972936A CN102237824B (en) | 2010-12-30 | 2011-04-19 | Photovoltaic (PV) inverter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102237824A CN102237824A (en) | 2011-11-09 |
| CN102237824B true CN102237824B (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100972936A Expired - Fee Related CN102237824B (en) | 2010-12-30 | 2011-04-19 | Photovoltaic (PV) inverter |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403737A (en) * | 2011-12-27 | 2012-04-04 | 保定天威集团有限公司 | Method and system for controlling wind-solar hybrid power generation and energy storage |
| CN103683313B (en) * | 2012-09-13 | 2016-11-23 | 华中科技大学 | A kind of photovoltaic DC-to-AC converter using mixed type power device |
| CN105094203B (en) * | 2014-12-01 | 2017-07-07 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | A kind of control method of multichannel Boost circuit |
| CN105033240A (en) * | 2015-08-07 | 2015-11-11 | 重庆铸豪机械有限责任公司 | Mini-tiller clutch production device which is powered on basis of renewable energy sources |
| CN113636628B (en) * | 2021-08-30 | 2024-03-12 | 江苏美淼环保科技有限公司 | Photovoltaic direct-driven membrane capacitance electro-adsorption desalination system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7099169B2 (en) * | 2003-02-21 | 2006-08-29 | Distributed Power, Inc. | DC to AC inverter with single-switch bipolar boost circuit |
| CN101610038A (en) * | 2009-07-13 | 2009-12-23 | 南京航空航天大学 | The photovoltaic combining inverter of Boost and Buck cascade and control method thereof |
| CN101867291A (en) * | 2009-04-17 | 2010-10-20 | 吕斌 | Household solar photovoltaic inverter |
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- 2011-04-19 CN CN2011100972936A patent/CN102237824B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7099169B2 (en) * | 2003-02-21 | 2006-08-29 | Distributed Power, Inc. | DC to AC inverter with single-switch bipolar boost circuit |
| CN101867291A (en) * | 2009-04-17 | 2010-10-20 | 吕斌 | Household solar photovoltaic inverter |
| CN101610038A (en) * | 2009-07-13 | 2009-12-23 | 南京航空航天大学 | The photovoltaic combining inverter of Boost and Buck cascade and control method thereof |
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| Publication number | Publication date |
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| CN102237824A (en) | 2011-11-09 |
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