CN105610185A - Intelligent grid connection control method for photovoltaic grid-connected inverter - Google Patents
Intelligent grid connection control method for photovoltaic grid-connected inverter Download PDFInfo
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- CN105610185A CN105610185A CN201510927887.3A CN201510927887A CN105610185A CN 105610185 A CN105610185 A CN 105610185A CN 201510927887 A CN201510927887 A CN 201510927887A CN 105610185 A CN105610185 A CN 105610185A
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- 230000003750 conditioning effect Effects 0.000 claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 19
- 230000005284 excitation Effects 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
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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
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- 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 present invention provides an intelligent grid connection control method for a photovoltaic grid-connected inverter. According to the method, a sampling conditioning module, a control module, an MPPT controller, an interleaved flyback module and an inversion module are provided; the control module includes a current loop PI regulator composed of a d-axis current regulator and a q-axis current regulator; the control module is connected with the sampling conditioning module, the MPPT controller and the interleaved flyback module separately; the input end of the sampling conditioning module and the input end of the interleaved flyback module are connected with a photovoltaic array; and the output end of the interleaved flyback module and the output end of the MPPT controller are connected with the inversion module. The intelligent grid connection control method of the invention is simple in structural principle. The intelligent grid connection control method can realize the seamless grid connection of the inverter, improve the reliability and stability of a system and the power quality of a power grid, bright social economic benefits and have high control precision and a great application value.
Description
Technical field:
The present invention relates to a kind of photovoltaic grid-connected device, relate in particular to a kind of photovoltaic combining inverter intelligence grid-connected control method.
Background technology:
Along with economic and social development, energy resource consumption is increasing, environmental pollution and electricity needs increase the development that makes people more and more pay attention to regenerative resource rapidly. Solar energy has become one of outer new forms of energy most with prospects of Now Domestic with its inexhaustible property and environment-friendly advantage. Parallel network power generation is exactly that photovoltaic generating system is directly connected with electrical network, has saved bulky, expensive, to be not easy maintenance battery. And combining inverter is as one of key equipment of grid-connected photovoltaic system, its performance, to improving photovoltaic efficiency, reduces costs and has great importance.
Photovoltaic combining inverter is the energy conversion link of solar power system, its Main Function is that direct current that solar panel is exported changes the equipment that meets alternating current that electrical network requires and input electrical network into, it is the core of grid-connected type photovoltaic system power conversion and control, its performance of photovoltaic combining inverter be not only impact and determine whether whole photovoltaic parallel in system can be stablized, safe, reliable, efficient operation, be also to affect the whole system principal element in service life simultaneously.
Summary of the invention:
The object of the invention provides a kind of structural principle simple, can realize inverter seamless grid-connected, and control accuracy is high, improves system reliability, stability, has improved the electrical network quality of power supply, has the technical scheme of very big using value and economic results in society:
A kind of photovoltaic combining inverter intelligence grid-connected control method, comprise sampling conditioning module, control module, MPPT controller, interleaving inverse excitation module, inversion module, control module comprises the electric current loop pi regulator being made up of d shaft current adjuster, q shaft current adjuster, control module connects respectively sampling conditioning module, MPPT controller, interleaving inverse excitation module, sampling conditioning module is connected respectively photovoltaic array with interleaving inverse excitation module input, interleaving inverse excitation module output is connected respectively inversion module with MPPT controller output end, and inversion module is connected with electrical network.
As preferably, interleaving inverse excitation module comprises the first transformer, the second transformer, the first switching tube, second switch pipe, the first transformer input connects the first switching tube, the first transformer output connects diode A, electric capacity A, first transformers connected in parallel the second transformer, the first paralleled power switches second switch pipe, the second transformer output connects diode B.
As preferably, sampling conditioning module comprises the first transport and placing device, the second transport and placing device, Si Mite flip chip, Hall element, the Hall element resistance A that is connected in parallel, resistance B, resistance C, resistance D, electric capacity B, and the electrode input end of access the first transport and placing device, the negative input of the first transport and placing device is connected with output, the output of the first transport and placing device is contact resistance E successively, resistance G, resistance F is connected on resistance E and resistance G node, resistance G one end connects the capacitor C being connected in parallel, diode D, diode D negative pole connects diode C positive pole, diode C negative pole access power end,
The second transport and placing device negative input connects the first transport and placing device electrode input end, the electrode input end of the second transport and placing device is contact resistance I one end, resistance J one end respectively, resistance I other end ground connection, second transport and placing device output contact resistance H one end, the resistance H other end connects respectively electric capacity D one end and Si Mite flip chip input, and the resistance J other end and the electric capacity D other end are managed ground connection by TVS respectively.
As preferably, its control method comprises the following steps:
A, sampling conditioning module gather the output current of photovoltaic array, process the feedback signal that forms d shaft current adjuster, q shaft current adjuster by control module;
The direct current of B, photovoltaic array output enters interleaving inverse excitation module, through DC/DC conversion, reaches satisfactory DC voltage, then is reverse into alternating voltage input inversion module through DC/AC;
C, current feedback signal and ac voltage signal are input in MPPT controller, and the signal of telecommunication that the control of MPPT controller collects, and the output of control inversion module, when the output voltage of control inversion module equates with line voltage, be connected to the grid inversion module.
Beneficial effect of the present invention is:
(1) structural principle of the present invention is simple, and the control module antijamming capability of employing is strong, and control accuracy is high, improves system reliability, stability.
(2) can to realize inverter seamless grid-connected in the present invention, improved the electrical network quality of power supply to have reduced to greatest extent the loss of power in conversion, thereby cut down the number of intermediate links, and realizes maximizes power utilization, has very big using value and economic results in society.
(3) the MPPT controller that the present invention adopts, can realize zero steady-state error control, can strengthen steady-state behaviour and the antijamming capability of system, has good tracking performance, can improve the control performance of system.
Brief description of the drawings:
Fig. 1 is fundamental diagram of the present invention;
Fig. 2 is interleaving inverse excitation modular circuit schematic diagram of the present invention;
Fig. 3 is sampling conditioning module circuit theory diagrams of the present invention.
Detailed description of the invention:
For making goal of the invention of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
As shown in Figure 1-Figure 3, a kind of photovoltaic combining inverter intelligence grid-connected control method, comprise sampling conditioning module 1, control module 2, MPPT controller 3, interleaving inverse excitation module 4, inversion module 5, described control module 2 comprises by d shaft current adjuster 6, the electric current loop pi regulator that q shaft current adjuster 7 forms, described control module 2 connects respectively described sampling conditioning module 1, described MPPT controller 3, described interleaving inverse excitation module 4, described sampling conditioning module 1 is connected respectively photovoltaic array 8 with described interleaving inverse excitation module 4 inputs, described interleaving inverse excitation module 4 outputs are connected respectively described inversion module 5 with described MPPT controller 3 outputs, described inversion module 5 is connected with electrical network 9.
In the present embodiment, interleaving inverse excitation module 4 comprises the first transformer 10, the second transformer 11, the first switching tube 12, second switch pipe 13, the first transformer 10 inputs connect the first switching tube 12, the first transformer 10 outputs connect diode A1c, electric capacity A1b, the first transformer 10 the second transformer 11 in parallel, the first switching tube 12 second switch pipe 13, the second transformer 11 outputs in parallel connect diode B2c. Switching tube adopts MOSFET, two staggered conductings of switching tube, and interleaving inverse excitation module 4 can be divided into two kinds of duties. State one: when
When the first switching tube 12 turn-offs, leakage inductance energy is by capacitive absorption, and in the time of 13 conducting of second switch pipe, energy passes to secondary by second switch pipe 13 through the second transformer 11; State two:
In the time that second switch pipe 13 turn-offs, leakage inductance energy is by capacitive absorption, when the first switching tube 12
When conducting, energy passes to secondary by the first switching tube 12 through the first transformer 10.
Sampling conditioning module 1 comprises the first transport and placing device 14, the second transport and placing device 15, Si Mite flip chip 16, Hall element 17, the Hall element 17 resistance A1a that is connected in parallel, resistance B2a, resistance C3a, resistance D4a, electric capacity B2b, and the electrode input end of access the first transport and placing device 14, the negative input of the first transport and placing device 14 is connected with output, the output of the first transport and placing device 14 is contact resistance E5a successively, resistance G7a, resistance F6a is connected on resistance E5a and resistance G7a node, resistance G7a one end connects the capacitor C 3b being connected in parallel, diode D4c, diode D4c negative pole connects diode C3c positive pole, diode C3c negative pole access power end,
The second transport and placing device 15 negative inputs connect the first transport and placing device 14 electrode input ends, the electrode input end of the second transport and placing device 15 is contact resistance I9a one end, resistance J10a one end respectively, resistance I9a other end ground connection, second transport and placing device 15 output contact resistance H8a one end, the resistance H8a other end connects respectively electric capacity D4b one end and Si Mite flip chip 16 inputs, and the resistance J10a other end and the electric capacity D4b other end are managed 17 ground connection by TVS respectively. Hall element 17 becomes the large voltage transitions of about 220V the small voltage signal of 11V, and transport and placing device is as voltage follower, and then signal is transported to control module after the amplitude limiter circuit of 3.3V and Si Mite flip chip 16.
Its control method comprises the following steps:
A, sampling conditioning module gather the output current of photovoltaic array, process the feedback signal that forms d shaft current adjuster, q shaft current adjuster by control module;
The direct current of B, photovoltaic array output enters interleaving inverse excitation module, through DC/DC conversion, reaches satisfactory DC voltage, then is reverse into alternating voltage input inversion module through DC/AC;
C, current feedback signal and ac voltage signal are input in MPPT controller, and the signal of telecommunication that the control of MPPT controller collects, and the output of control inversion module, when the output voltage of control inversion module equates with line voltage, be connected to the grid inversion module. The control of MPPT controller is very important link, and it can ensure power supply continuity and the high efficiency of whole photovoltaic system.
Beneficial effect of the present invention is: structural principle of the present invention is simple, and the control module antijamming capability of employing is strong, and control accuracy is high, improves system reliability, stability; Can realize inverter seamless grid-connected, improve the electrical network quality of power supply to have reduced to greatest extent the loss of power in conversion, thereby cut down the number of intermediate links, realize maximizes power utilization, there are very big using value and economic results in society; The MPPT controller adopting, can realize zero steady-state error control, can strengthen steady-state behaviour and the antijamming capability of system, has good tracking performance, can improve the control performance of system.
Above-described embodiment is preferred embodiment of the present invention; it is not the restriction to technical solution of the present invention; as long as the technical scheme that can realize on the basis of above-described embodiment without creative work, all should be considered as falling within the scope of the rights protection of patent of the present invention.
Claims (4)
1. a photovoltaic combining inverter intelligence grid-connected control method, it is characterized in that: comprise sampling conditioning module, control module, MPPT controller, interleaving inverse excitation module, inversion module, described control module comprises by d shaft current adjuster, the electric current loop pi regulator of q shaft current adjuster composition, described control module connects respectively described sampling conditioning module, described MPPT controller, described interleaving inverse excitation module, described sampling conditioning module is connected respectively photovoltaic array with described interleaving inverse excitation module input, described interleaving inverse excitation module output is connected respectively described inversion module with described MPPT controller output end, described inversion module is connected with electrical network.
2. a kind of photovoltaic combining inverter intelligence grid-connected control method according to claim 1, it is characterized in that: described interleaving inverse excitation module comprises the first transformer, the second transformer, the first switching tube, second switch pipe, the first transformer input connects the first switching tube, the first transformer output connects diode A, electric capacity A, first transformers connected in parallel the second transformer, the first paralleled power switches second switch pipe, the second transformer output connects diode B.
3. a kind of photovoltaic combining inverter intelligence grid-connected control method according to claim 1, it is characterized in that: described sampling conditioning module comprises the first transport and placing device, the second transport and placing device, Si Mite flip chip, Hall element, the Hall element resistance A that is connected in parallel, resistance B, resistance C, resistance D, electric capacity B, and the electrode input end of access the first transport and placing device, the negative input of the first transport and placing device is connected with output, the output of the first transport and placing device is contact resistance E successively, resistance G, resistance F is connected on resistance E and resistance G node, resistance G one end connects the capacitor C being connected in parallel, diode D, diode D negative pole connects diode C positive pole, diode C negative pole access power end,
The second transport and placing device negative input connects the first transport and placing device electrode input end, the electrode input end of the second transport and placing device is contact resistance I one end, resistance J one end respectively, resistance I other end ground connection, second transport and placing device output contact resistance H one end, the resistance H other end connects respectively electric capacity D one end and Si Mite flip chip input, and the resistance J other end and the electric capacity D other end are managed ground connection by TVS respectively.
4. a kind of photovoltaic combining inverter intelligence grid-connected control method according to claim 1, is characterized in that: its control method comprises the following steps:
Sampling conditioning module gathers the output current of photovoltaic array, processes the feedback signal that forms d shaft current adjuster, q shaft current adjuster by control module;
The direct current of photovoltaic array output enters interleaving inverse excitation module, through DC/DC conversion, reaches satisfactory DC voltage, then is reverse into alternating voltage input inversion module through DC/AC;
Current feedback signal and ac voltage signal are input in MPPT controller, and the signal of telecommunication that the control of MPPT controller collects, and the output of control inversion module, when the output voltage of control inversion module equates with line voltage, be connected to the grid inversion module.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222937A (en) * | 2011-06-22 | 2011-10-19 | 常熟开关制造有限公司(原常熟开关厂） | Photovoltaic grid-connected inverter and grid-connected control method thereof |
| CN102856926A (en) * | 2012-09-12 | 2013-01-02 | 福州大学 | Integrated magnetics based interleaved flyback micropower grid-connected inverter |
| CN103208939A (en) * | 2013-04-19 | 2013-07-17 | 江西中能电气科技有限公司 | Photovoltaic micro-inverter based on secondary-side reference current reconstruction, control system and control method |
| CN103647453A (en) * | 2013-12-13 | 2014-03-19 | 中南大学 | CCM-based micro inverter and control method thereof |
| CN103997053A (en) * | 2014-06-12 | 2014-08-20 | 四川厚天电气股份有限公司 | Energy bidirectional flow EPS system |
-
2015
- 2015-12-15 CN CN201510927887.3A patent/CN105610185A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222937A (en) * | 2011-06-22 | 2011-10-19 | 常熟开关制造有限公司(原常熟开关厂） | Photovoltaic grid-connected inverter and grid-connected control method thereof |
| CN102856926A (en) * | 2012-09-12 | 2013-01-02 | 福州大学 | Integrated magnetics based interleaved flyback micropower grid-connected inverter |
| CN103208939A (en) * | 2013-04-19 | 2013-07-17 | 江西中能电气科技有限公司 | Photovoltaic micro-inverter based on secondary-side reference current reconstruction, control system and control method |
| CN103647453A (en) * | 2013-12-13 | 2014-03-19 | 中南大学 | CCM-based micro inverter and control method thereof |
| CN103997053A (en) * | 2014-06-12 | 2014-08-20 | 四川厚天电气股份有限公司 | Energy bidirectional flow EPS system |
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Effective date of registration: 20160824 Address after: 273200 No. 34 Guangming Road, Surabaya County, Shandong, Jining Applicant after: SISHUI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER COMPANY Applicant after: State Grid Corporation of China Address before: 273200 No. 34 Guangming Road, Surabaya County, Shandong, Jining Applicant before: SISHUI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER COMPANY |
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