CN111371101A - Light stores up compound dynamic voltage governing system of grid-connected power generation - Google Patents
Light stores up compound dynamic voltage governing system of grid-connected power generation Download PDFInfo
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- CN111371101A CN111371101A CN202010222363.5A CN202010222363A CN111371101A CN 111371101 A CN111371101 A CN 111371101A CN 202010222363 A CN202010222363 A CN 202010222363A CN 111371101 A CN111371101 A CN 111371101A
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- cell panel
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- 238000010248 power generation Methods 0.000 title claims abstract description 16
- 150000001875 compounds Chemical class 0.000 title claims description 4
- 238000004146 energy storage Methods 0.000 claims abstract description 39
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 238000005286 illumination Methods 0.000 claims description 20
- 230000003287 optical effect Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 210000004027 cell Anatomy 0.000 description 24
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 210000000352 storage cell Anatomy 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a light storage grid-connected power generation composite dynamic voltage regulation system, which comprises: the photovoltaic energy storage device comprises a photovoltaic cell panel and an energy storage unit, wherein the output end of the photovoltaic cell panel is connected with a first converter through a switch S1; the energy storage unit interface is connected with the third converter through a switch S3 and then connected with the output end of the photovoltaic cell panel in parallel, and the tail end of the output end of the photovoltaic cell panel is connected with the second converter through a switch S2. According to the composite dynamic voltage regulating system for the light storage grid-connected power generation, provided by the invention, the voltage compensation of the DVR is realized, meanwhile, the configuration of the energy storage capacity is reduced, and the economy of the whole system is improved.
Description
Technical Field
The invention relates to a light storage grid-connected power generation composite dynamic voltage regulation system, and belongs to the technical field of power system automation.
Background
With the development of society, the requirement of industry on the quality of electric energy is gradually increased. Voltage sag is a serious power quality problem, which has a great influence on production departments, particularly precision production departments, and therefore, it is necessary to solve the voltage sag problem.
The uninterrupted power supply and the reactive compensator are important equipment for ensuring the voltage stability of a power supply system, but the two kinds of equipment have the problems of small compensation capacity, limited compensation capacity and the like. As a series compensation device, a Dynamic Voltage Regulator (DVR) can track the change of voltage in real time and compensate voltage drop in time, and has the characteristics of large compensation capacity, long compensation time and strong compensation capability.
At present, a dynamic voltage regulator DVR uses an energy storage system as an energy source, needs to be charged at regular time, can only realize a compensation function, and therefore is poor in economy and has certain defects in application.
Disclosure of Invention
The purpose is as follows: in order to solve the problems of single function, difficult charging and low cost performance of an energy storage type DVR in the prior art, the invention provides a composite dynamic voltage regulating system for optical storage grid-connected power generation.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a light stores up and is incorporated into power networks compound dynamic voltage governing system of electricity generation, includes: the photovoltaic energy storage device comprises a photovoltaic cell panel and an energy storage unit, wherein the output end of the photovoltaic cell panel is connected with a first converter through a switch S1; the energy storage unit interface is connected with the third converter through a switch S3 and then connected with the output end of the photovoltaic cell panel in parallel, and the tail end of the output end of the photovoltaic cell panel is connected with the second converter through a switch S2.
Preferably, the first converter is a single-stage inverter.
Preferably, the second converter adopts a full-bridge inverter circuit of an H-bridge.
Preferably, the third converter is a DC/DC converter.
As a preferable scheme, the energy storage unit adopts one or a combination of more of super capacitor energy storage, storage by a storage battery pack or superconducting energy storage.
As a preferred scheme, when the voltage of a distribution line in the daytime is within an operation range specified by national standards, a switch S1 is closed, a switch S2 is opened, and a switch S3 is closed, so that the photovoltaic cell panel is connected to the grid through a first converter to transmit power to the power grid, and meanwhile, the energy storage unit is charged;
when the voltage of the distribution line is in the operation range specified by the national standard at night, the switch S1 is disconnected, the switch S2 is disconnected, the switch S3 is closed, and the photovoltaic cell panel does not generate active power;
when the line voltage drops in the daytime and the illumination intensity is sufficient and is greater than the first illumination threshold value, the switch S1 is switched off, the switch S2 is switched on, the switch S3 is switched off, and only the photovoltaic cell panel provides energy to the direct current side of the second converter, so that the DVR compensation voltage is realized;
when the line voltage drops in the daytime and the illumination intensity is insufficient and is smaller than the first illumination threshold value, the switch S1 is switched off, the switch S2 is switched on, the switch S3 is switched on, and the photovoltaic cell panel and the energy storage unit supply energy to the direct current side of the second converter in the same direction, so that the DVR compensation voltage is realized;
when the line voltage drops at night, the switch S1 is switched off, the switch S2 is switched on, the switch S3 is switched on, and the energy storage unit transmits energy to the direct current side of the second converter, so that the voltage compensation of the DVR is realized.
Has the advantages that: according to the light storage grid-connected power generation composite dynamic voltage regulation system, when the line voltage is in the national standard operation range, the photovoltaic cell is connected to the grid to generate power for the power grid, and energy storage and charging are simultaneously performed, so that the photovoltaic utilization rate is improved, and the energy storage and charging mode is simplified. When the line voltage drops, the energy supply mode to the DVR is determined according to the time of the voltage drop and the illumination intensity. When the illumination intensity is enough in the daytime, the photovoltaic cell alone provides energy for the DVR; when the illumination intensity is insufficient in the daytime, the photovoltaic cell and the low-capacity energy storage are combined to supply energy to the DVR; when the illumination intensity is 0 at night, the DVR is independently powered by the small-capacity energy storage. This energy supply mode has reduced the configuration of energy storage capacity, has promoted the economic nature of entire system.
Drawings
Fig. 1 is a schematic structural diagram of a composite dynamic voltage regulation system for optical storage grid-connected power generation.
Fig. 2 is a single stage inverter topology.
Fig. 3 is a full bridge inverter circuit based on an H-bridge.
Fig. 4 is a bidirectional DC/DC energy storage cell structure.
Fig. 5 is a diagram of switching the working modes of the optical storage grid-connected power generation composite dynamic voltage regulation system.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, an optical storage grid-connected power generation composite dynamic voltage regulation system includes: the photovoltaic solar panel comprises a photovoltaic cell panel 1 and an energy storage unit 2, wherein the output end of the photovoltaic cell panel 1 is connected with a first converter 3 through a switch S16; the interface of the energy storage unit 2 is connected with the third converter 5 through a switch S38 and then connected with the output end of the photovoltaic cell panel 1 in parallel, and the tail end of the output end of the photovoltaic cell panel 1 is connected with the second converter 4 through a switch S27.
As shown in fig. 2, the output end of the photovoltaic cell panel is connected in parallel with a filter capacitor after passing through a switch S1.
The first converter adopts a single-stage inverter.
As shown in fig. 3, the second converter employs a full bridge inverter circuit of an H-bridge.
As shown in fig. 4, the third converter employs a DC/DC converter.
Example 1:
when the light storage grid-connected power generation composite dynamic voltage regulation system is used, the alternating current side of the first converter is connected to a distribution line. The alternating current side of the second converter is connected into a distribution line, the low voltage side of the third converter is connected with a switch S3 in series, and the high voltage side of the third converter is connected with the 1 st and 2 nd outlets of the photovoltaic cell panel in parallel.
The direct current side of the photovoltaic cell panel, the direct current side of the second converter and the high voltage side of the third converter are all connected at the same connection point.
The energy storage unit adopts one or a combination of more of super capacitor energy storage, storage battery pack energy storage or superconducting energy storage.
As shown in fig. 5, example 2:
when the voltage of the distribution line is in the operation range specified by the national standard in the daytime, the switch S1 is closed, the switch S2 is opened, and the switch S3 is closed, so that the photovoltaic cell panel transmits power to the power grid through the inverter grid connection, and meanwhile, the low-capacity energy storage unit is charged.
When the voltage of the distribution line is in the operation range specified by the national standard at night, the switch S1 is switched off, the switch S2 is switched off, and the switch S3 is switched on, so that the switch S1 is switched off because the illumination intensity at night approaches to 0 and the photovoltaic cell panel does not generate active power at the moment; to prepare for voltage sags that may occur at any time, reducing the reaction time of the system, switch S2 is opened and switch S3 is closed.
When the line voltage falls off in the daytime, the illumination intensity is sufficient, and the illumination intensity is greater than the first illumination threshold value, the switch S1 is disconnected, the switch S2 is closed, the switch S3 is disconnected, and only the photovoltaic cell panel provides energy to the direct current side of the second converter, so that the DVR compensation voltage is realized.
When line voltage falls off in the daytime, the illumination intensity is insufficient, and the illumination intensity is smaller than a first illumination threshold value, the output current of the photovoltaic cell panel is low, at the moment, the switch S1 is disconnected, the switch S2 is closed, the switch S3 is closed, the photovoltaic cell panel and the small-capacity energy storage unit provide energy to the direct current side of the second converter in the same direction, and the DVR compensation voltage is realized.
When the line voltage drops at night, the illumination intensity is 0 at the moment, the output power of the photovoltaic cell panel is 0, at the moment, the switch S1 is disconnected, the switch S2 is closed, the switch S3 is closed, and only the small-capacity energy storage unit transmits energy to the direct current side of the second converter, so that the voltage compensation of the DVR is realized.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. A light stores up and is incorporated into power networks compound dynamic voltage governing system of electricity generation, includes: photovoltaic cell board, energy storage unit, its characterized in that: the output end of the photovoltaic cell panel is connected with the first converter through a switch S1; the energy storage unit interface is connected with the third converter through a switch S3 and then connected with the output end of the photovoltaic cell panel in parallel, and the tail end of the output end of the photovoltaic cell panel is connected with the second converter through a switch S2.
2. The optical storage grid-connected power generation composite dynamic voltage regulation system according to claim 1, characterized in that: the first converter adopts a single-stage inverter.
3. The optical storage grid-connected power generation composite dynamic voltage regulation system according to claim 1, characterized in that: the second converter adopts a full-bridge inverter circuit of an H bridge.
4. The optical storage grid-connected power generation composite dynamic voltage regulation system according to claim 1, characterized in that: the third converter adopts a DC/DC converter.
5. The optical storage grid-connected power generation composite dynamic voltage regulation system according to claim 1, characterized in that: the energy storage unit adopts one or a combination of more of super capacitor energy storage, storage battery pack energy storage or superconducting energy storage.
6. The optical storage grid-connected power generation composite dynamic voltage regulation system according to claims 1 to 5, characterized in that:
when the voltage of the distribution line is in the operation range specified by the national standard in the daytime, the switch S1 is closed, the switch S2 is opened, and the switch S3 is closed, so that the photovoltaic cell panel is connected to the grid through the first converter to transmit power to the power grid, and meanwhile, the energy storage unit is charged;
when the voltage of the distribution line is in the operation range specified by the national standard at night, the switch S1 is disconnected, the switch S2 is disconnected, the switch S3 is closed, and the photovoltaic cell panel does not generate active power;
when the line voltage drops in the daytime and the illumination intensity is sufficient and is greater than the first illumination threshold value, the switch S1 is switched off, the switch S2 is switched on, the switch S3 is switched off, and only the photovoltaic cell panel provides energy to the direct current side of the second converter, so that the DVR compensation voltage is realized;
when the line voltage drops in the daytime and the illumination intensity is insufficient and is smaller than the first illumination threshold value, the switch S1 is switched off, the switch S2 is switched on, the switch S3 is switched on, and the photovoltaic cell panel and the energy storage unit supply energy to the direct current side of the second converter in the same direction, so that the DVR compensation voltage is realized;
when the line voltage drops at night, the switch S1 is switched off, the switch S2 is switched on, the switch S3 is switched on, and the energy storage unit transmits energy to the direct current side of the second converter, so that the voltage compensation of the DVR is realized.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010222363.5A CN111371101A (en) | 2020-03-26 | 2020-03-26 | Light stores up compound dynamic voltage governing system of grid-connected power generation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010222363.5A CN111371101A (en) | 2020-03-26 | 2020-03-26 | Light stores up compound dynamic voltage governing system of grid-connected power generation |
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| CN111371101A true CN111371101A (en) | 2020-07-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201479046U (en) * | 2009-08-17 | 2010-05-19 | 戴超波 | Dynamic voltage recovery system based on solar power generation and energy storage |
| CN103346570A (en) * | 2013-06-07 | 2013-10-09 | 上海驹电电气科技有限公司 | Solar photovoltaic power generation dynamic voltage compensator with energy storage function |
| CN107733065A (en) * | 2017-11-17 | 2018-02-23 | 南京理工大学 | Photovoltaic power supply hybrid energy storage system under low-light condition and energy management method thereof |
| CN108233396A (en) * | 2018-03-15 | 2018-06-29 | 南京工程学院 | A kind of Unified Power Quality Controller and its control method with light storage unit |
| CN109546686A (en) * | 2018-12-28 | 2019-03-29 | 长沙理工大学 | The voltage compensation and uninterrupted power supply method of dynamic electric voltage recovery device based on light hair long electric unit |
-
2020
- 2020-03-26 CN CN202010222363.5A patent/CN111371101A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201479046U (en) * | 2009-08-17 | 2010-05-19 | 戴超波 | Dynamic voltage recovery system based on solar power generation and energy storage |
| CN103346570A (en) * | 2013-06-07 | 2013-10-09 | 上海驹电电气科技有限公司 | Solar photovoltaic power generation dynamic voltage compensator with energy storage function |
| CN107733065A (en) * | 2017-11-17 | 2018-02-23 | 南京理工大学 | Photovoltaic power supply hybrid energy storage system under low-light condition and energy management method thereof |
| CN108233396A (en) * | 2018-03-15 | 2018-06-29 | 南京工程学院 | A kind of Unified Power Quality Controller and its control method with light storage unit |
| CN109546686A (en) * | 2018-12-28 | 2019-03-29 | 长沙理工大学 | The voltage compensation and uninterrupted power supply method of dynamic electric voltage recovery device based on light hair long electric unit |
Non-Patent Citations (2)
| Title |
|---|
| 付学谦等: "基于光伏发电的DVR补偿配电网电压暂降", 《华东电力》 * |
| 成瑞芬等: "微电网动态电压恢复器运行模式研究", 《电网技术》 * |
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Application publication date: 20200703 |