CN101257215A - Three-phase four-wire photovoltaic parallel network generating system - Google Patents
Three-phase four-wire photovoltaic parallel network generating system Download PDFInfo
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- CN101257215A CN101257215A CNA2008100937729A CN200810093772A CN101257215A CN 101257215 A CN101257215 A CN 101257215A CN A2008100937729 A CNA2008100937729 A CN A2008100937729A CN 200810093772 A CN200810093772 A CN 200810093772A CN 101257215 A CN101257215 A CN 101257215A
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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 three-phase four-wire photovoltaic grid-connected power system which includes: a DC-DC boost circuit composed of H bridge constituted by IGBT, high frequency transformer and rectifier bridge, input port connects with solar panel and output port connects with grid-connected inverter circuit; a grid-connected inverter circuit connected with IGBT bridge with four bridge arms and accessed to power network through grid-connected electrical inductance; a control circuit composed of signal process module, micro-process module, drive module and connected with DC-DC boost circuit and grid-connected electrical inductance respectively. The three-phase four-wire photovoltaic grid-connected power system can control solar panel output max power, and automatic adjust three-way single phase power output.
Description
Technical field:
The present invention relates to a kind of grid-connected photovoltaic system of three-phase and four-line, belong to generation of electricity by new energy technology and electric and electronic technical field.
Background technology:
Along with the exhaustion of fossil energy, solar energy has obtained extensive use as one of the most potential new forms of energy.Generating electricity by way of merging two or more grid systems is one of optimal path of solar energy utilization, and it is converted to and stable AC energy input electrical network by the variable direct current energy of grid-connected system with solar panel output, uses for the user.
Grid-connected photovoltaic system mainly is made up of DC-DC booster circuit, grid-connected inverter circuit and control circuit.The inverter main circuit of present three-phase and four-line grid-connected photovoltaic system generally is made up of three single-phase inversion unit, can power respectively for threephase load or three road single-phase loads, but because the power device in the circuit is more, cause cost higher.
Summary of the invention:
The present invention is intended to propose a kind of grid-connected photovoltaic system of three-phase and four-line, by adopting new topological structure, overcome more, the more high shortcoming of cost of power device in the existing system, realize the maximum power output of solar panel simultaneously, can also control the output of each phase electric energy according to the size of three road single-phase loads.
The grid-connected photovoltaic system of a kind of three-phase and four-line that the present invention proposes comprises:
DC-DC booster circuit, grid-connected inverter circuit and control circuit;
The input of described DC-DC booster circuit links to each other with solar panel, output links to each other with grid-connected inverter circuit, be used for will be lower the solar panel output voltage change the direct voltage of higher Gong inversion into, realize the maximum power output of solar panel simultaneously;
Described grid-connected inverter circuit links to each other with electrical network, the direct voltage of DC-DC booster circuit output is converted to and three phase network voltage with the alternating voltage of homophase frequently, for threephase load or three road single-phase loads are powered respectively;
Described control circuit links to each other respectively with grid-connected inverter circuit with the DC-DC booster circuit, is respectively DC-DC booster circuit and grid-connected inverter circuit pwm control signal is provided.
The structure of the DC-DC booster circuit of the grid-connected photovoltaic system of above-mentioned three-phase and four-line is a full-bridge type high frequency chain circuit, and the H bridge, high frequency transformer and the rectifier bridge that are made of IGBT constitute; The H bridge that described IGBT constitutes links to each other with the input of high frequency transformer, solar cell panel voltages is converted to the alternating voltage of high frequency; Output after the high frequency voltage that the H bridge that described high frequency transformer constitutes IGBT is exported boosts; Described rectifier bridge is a high-voltage dc voltage with the output voltage rectification of high frequency transformer.
The grid-connected inverter circuit of the grid-connected photovoltaic system of above-mentioned three-phase and four-line is made up of the IGBT bridge of 4 brachium pontis and the inductance that is incorporated into the power networks, and with the direct voltage inversion is and the alternating current input electrical network of three phase network with the frequency homophase.
The control circuit of the grid-connected photovoltaic system of above-mentioned three-phase and four-line is made up of signal processing module, microprocessor and driver module; Described signal processing module, driver module all link to each other with microcontroller; Described microprocessor starts the A/D sampling, obtain the electric current and voltage value of solar panel, the electric current and voltage value of electrical network and the output current value of grid-connected inverter circuit, search for the voltage reference value at maximum power point place according to the characteristic of solar panel, the difference of voltage reference value and actual voltage value is after PI regulates, calculate the PWM duty ratio and the output of DC-DC booster circuit, size according to three road single-phase load electric currents is calculated the threephase load size, again by current power output capacity, calculate the size of each phase output current, after regulating relatively and by PI with the grid-connected inverter circuit actual output current, the PWM duty ratio and the output of calculating grid-connected inverter circuit.
The invention has the beneficial effects as follows:
1. the power device of the grid-connected photovoltaic system of three-phase and four-line of the present invention employing is less, cost is lower.
2. the grid-connected photovoltaic system efficient of three-phase and four-line of the present invention is higher, can be according to the difference of three road single-phase loads, automatically adjust the output of three road single-phase electric energies, make that the big electric energy of output mutually of load is more, the little electric energy of output mutually of load is less, help keeping the power-balance of electrical network, improve the stability of electrical network, be particularly suitable for by solar powered grid and the lower minor scale power net of power grade.
Description of drawings:
Fig. 1 is the structured flowchart of the grid-connected photovoltaic system of three-phase and four-line of the present invention.
Fig. 2 is the control circuit structured flowchart of the grid-connected photovoltaic system of three-phase and four-line of the present invention.
Embodiment:
The grid-connected photovoltaic system of the three-phase and four-line that the present invention proposes, its structured flowchart comprises as shown in Figure 1: DC-DC booster circuit, grid-connected inverter circuit and control circuit.The input of DC-DC booster circuit links to each other with solar panel, output links to each other with grid-connected inverter circuit, be used for will be lower the solar panel output voltage change the direct voltage of higher Gong inversion into, realize the maximum power output of solar panel simultaneously.Grid-connected inverter circuit links to each other with electrical network, direct voltage is converted to and three phase network voltage with the alternating voltage input electrical network of homophase frequently, for threephase load or three road single-phase loads are powered respectively.Control circuit links to each other respectively with grid-connected inverter circuit with the DC-DC booster circuit, is respectively DC-DC booster circuit and grid-connected inverter circuit pwm control signal is provided.
The structure of the DC-DC booster circuit of the grid-connected photovoltaic system of above-mentioned three-phase and four-line is a full-bridge type high frequency chain circuit, by IGBT S1, and S2, S3, H bridge, high frequency transformer T and D1 that S4 constitutes, D2, D3, the rectifier bridge that D4 constitutes is formed; IGBT S1, S2, S3, the H bridge that S4 constitutes links to each other with the input of high frequency transformer T, solar cell panel voltages is converted to the alternating voltage of high frequency; Output after the high frequency voltage that high frequency transformer T exports IGBT H bridge boosts; D1, D2, D3, the rectifier bridge that D4 constitutes is a high-voltage dc voltage with the output voltage rectification of high frequency transformer T.
The grid-connected inverter circuit of the grid-connected photovoltaic system of above-mentioned three-phase and four-line is by the IGBT bridge Uh of 4 brachium pontis, Ul, and Vh, Vl, Wh, Wl, Oh, the Ol and the inductance L s that is incorporated into the power networks form, and with the direct voltage inversion be and three phase network is imported electrical network with the alternating current of homophase frequently.
The structured flowchart of the control circuit of the grid-connected photovoltaic system of above-mentioned three-phase and four-line is made up of signal processing module, microprocessor and driver module as shown in Figure 2.Signal processing module is treated to voltage signal in the certain limit with the voltage and current signal of the voltage and current signal of solar panel, electrical network; The work that microprocessor is finished has: start the A/D sampling, obtain the electric current and voltage value Vdc of solar panel, idc, the electric current and voltage value usabc of electrical network, the output current value iabc0 of isabc and grid-connected inverter circuit, search for the voltage reference value Vdc_ref at maximum power point place according to the characteristic of solar panel, the difference of voltage reference value Vdc_ref and actual voltage value Vdc is after PI regulates, calculate the PWM duty ratio and the output of DC-DC booster circuit, size according to three road single-phase load current i sabc is calculated the threephase load size, again by current power output capacity, calculate the size of each phase output current iabc0_ref, after regulating relatively and by PI with grid-connected inverter circuit actual output current iabc0, the PWM duty ratio and the output of calculating grid-connected inverter circuit; Described driver module is exported the pwm pulse of microprocessor output after power amplification, control DC-DC booster circuit and grid-connected inverter circuit respectively.
Claims (4)
1, a kind of grid-connected photovoltaic system of three-phase and four-line comprises DC-DC booster circuit, grid-connected inverter circuit and control circuit, it is characterized in that, the input of described DC-DC booster circuit links to each other with solar panel, and output links to each other with grid-connected inverter circuit; Described grid-connected inverter circuit links to each other with electrical network; Described control circuit links to each other respectively with grid-connected inverter circuit with the DC-DC booster circuit.
2, the grid-connected photovoltaic system of three-phase and four-line according to claim 1, it is characterized in that, the structure of described DC-DC booster circuit is a full-bridge type high frequency chain circuit, the H bridge, high frequency transformer and the rectifier bridge that are made of IGBT constitute, and wherein the H bridge of IGBT formation links to each other with the input of high frequency transformer; The output of high frequency transformer links to each other with rectifier bridge.
3, the grid-connected photovoltaic system of three-phase and four-line according to claim 1 is characterized in that, described grid-connected inverter circuit links to each other with the IGBT bridge of 4 brachium pontis, and inductance inserts electrical network by being incorporated into the power networks.
4, the grid-connected photovoltaic system of three-phase and four-line according to claim 1 is characterized in that, described control circuit is made up of signal processing module, microprocessor and driver module; Wherein signal processing module, driver module all link to each other with microcontroller; Microprocessor starts the A/D sampling, obtain the electric current and voltage value of solar panel, the electric current and voltage value of electrical network and the output current value of grid-connected inverter circuit, search for the voltage reference value at maximum power point place according to the characteristic of solar panel, the difference of voltage reference value and actual voltage value is after PI regulates, calculate the PWM duty ratio and the output of DC-DC booster circuit, size according to three road single-phase load electric currents is calculated the threephase load size, again by current power output capacity, calculate the size of each phase output current, after regulating relatively and by PI with the grid-connected inverter circuit actual output current, the PWM duty ratio and the output of calculating grid-connected inverter circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100937729A CN101257215A (en) | 2008-04-18 | 2008-04-18 | Three-phase four-wire photovoltaic parallel network generating system |
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| CNA2008100937729A CN101257215A (en) | 2008-04-18 | 2008-04-18 | Three-phase four-wire photovoltaic parallel network generating system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101795101A (en) * | 2010-04-08 | 2010-08-04 | 北京交通大学 | Maximum power point tracking (MPPT) control device of photovoltaic generating system |
| CN101697418B (en) * | 2009-10-23 | 2011-11-30 | 湖南大学 | Photovoltaic inversion grid-connection and harmonic suppression hybrid system for micro grid and composite control method thereof |
| CN102347706A (en) * | 2010-07-27 | 2012-02-08 | 冯益安 | Photovoltaic or wind-energy signal source type pure sine wave grid-connected inverter |
| CN102545374A (en) * | 2011-12-26 | 2012-07-04 | 东莞市凯登能源科技有限公司 | Method without needing direct connection between solar cell panels and cells, device and system |
| CN102593868A (en) * | 2012-02-29 | 2012-07-18 | 黑龙江省电力科学研究院 | Distributed three-phase four-wire photovoltaic grid-connected device with electric energy adjusting function |
| CN103023358A (en) * | 2012-12-17 | 2013-04-03 | 中国科学院电工研究所 | Method for calculating current reference value of three-phase four-wire grid-connected voltage source type pulse-width modulation (PWM) rectifier |
| CN103151948A (en) * | 2013-02-04 | 2013-06-12 | 安徽明赫新能源有限公司 | Dual H-bridge high-frequency isolation type photovoltaic grid-connected inverter |
| CN103368442A (en) * | 2013-07-16 | 2013-10-23 | 上海煦达新能源科技有限公司 | Grid-connected inverter |
-
2008
- 2008-04-18 CN CNA2008100937729A patent/CN101257215A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101697418B (en) * | 2009-10-23 | 2011-11-30 | 湖南大学 | Photovoltaic inversion grid-connection and harmonic suppression hybrid system for micro grid and composite control method thereof |
| CN101795101A (en) * | 2010-04-08 | 2010-08-04 | 北京交通大学 | Maximum power point tracking (MPPT) control device of photovoltaic generating system |
| CN101795101B (en) * | 2010-04-08 | 2012-09-05 | 北京交通大学 | Maximum power point tracking (MPPT) control device of photovoltaic generating system |
| CN102347706A (en) * | 2010-07-27 | 2012-02-08 | 冯益安 | Photovoltaic or wind-energy signal source type pure sine wave grid-connected inverter |
| CN102545374A (en) * | 2011-12-26 | 2012-07-04 | 东莞市凯登能源科技有限公司 | Method without needing direct connection between solar cell panels and cells, device and system |
| CN102545374B (en) * | 2011-12-26 | 2015-08-26 | 东莞市凯登能源科技有限公司 | A kind of method, Apparatus and system directly connecting solar panel without the need to battery |
| CN102593868A (en) * | 2012-02-29 | 2012-07-18 | 黑龙江省电力科学研究院 | Distributed three-phase four-wire photovoltaic grid-connected device with electric energy adjusting function |
| CN103023358A (en) * | 2012-12-17 | 2013-04-03 | 中国科学院电工研究所 | Method for calculating current reference value of three-phase four-wire grid-connected voltage source type pulse-width modulation (PWM) rectifier |
| CN103151948A (en) * | 2013-02-04 | 2013-06-12 | 安徽明赫新能源有限公司 | Dual H-bridge high-frequency isolation type photovoltaic grid-connected inverter |
| CN103368442A (en) * | 2013-07-16 | 2013-10-23 | 上海煦达新能源科技有限公司 | Grid-connected inverter |
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Open date: 20080903 |