CN112994091A - Efficiency optimization system suitable for photovoltaic power station - Google Patents
Efficiency optimization system suitable for photovoltaic power station Download PDFInfo
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- CN112994091A CN112994091A CN202110207263.XA CN202110207263A CN112994091A CN 112994091 A CN112994091 A CN 112994091A CN 202110207263 A CN202110207263 A CN 202110207263A CN 112994091 A CN112994091 A CN 112994091A
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- 238000005457 optimization Methods 0.000 title claims abstract description 30
- 238000004146 energy storage Methods 0.000 claims abstract description 32
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- 238000010248 power generation Methods 0.000 description 14
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/04—Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/06—Energy or water supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The invention discloses a photovoltaic power station efficiency optimization system, which is applicable to the photovoltaic power station efficiency optimization system, and comprises at least one direct current energy storage unit, at least one bidirectional DC/DC direct current channel is arranged on the direct current side of a photovoltaic inverter, the direct current energy storage unit is connected with the at least one bidirectional DC/DC direct current channel, a control system is connected with the at least one photovoltaic inverter and the at least one bidirectional DC/DC direct current channel, the control system acquires real-time operation data of the inverter, and controls the bidirectional DC/DC direct current channel to compensate or absorb electric power based on the operation data.
Description
Technical Field
The invention belongs to the technical field of photovoltaic power generation, and particularly relates to an efficiency optimization system suitable for a photovoltaic power station.
Background
Due to the consideration of economy, the photovoltaic power generation system is constructed by considering the over-distribution of the photovoltaic modules of 1.1 to 1.3 times, namely the theoretical peak power generation power of the photovoltaic modules is 1.1 to 1.3 times of the maximum power of the inverter. Although the inverter has certain overload capacity, the inverter is limited by temperature and temperature rise of internal components, the overload capacity of the inverter cannot be stably used, the inverter is frequently overloaded to work, the aging problem of inverter devices is increased, and the service life of the whole inverter is shortened. Therefore, the problem that partial peak power of the photovoltaic module cannot be utilized inevitably exists, and the photovoltaic module is a congenital light abandoning phenomenon.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an efficiency optimization system suitable for a photovoltaic power station, which reduces light abandon of the efficiency optimization system suitable for the photovoltaic power station, rationalizes direct current power flow and prevents overload aging of an inverter device.
The purpose of the invention is realized by the following technical scheme, and the efficiency optimization system suitable for the photovoltaic power station comprises:
at least one bidirectional DC/DC direct current channel provided on the DC side of the photovoltaic power plant inverter,
a direct current energy storage unit connected to the at least one bidirectional DC/DC direct current channel,
and the control system is connected with the at least one inverter and the at least one bidirectional DC/DC direct current channel, acquires real-time operation data of the inverter, and controls the bidirectional DC/DC direct current channel to compensate or absorb electric power based on the operation data.
The system is suitable for being used in a photovoltaic power station efficiency optimization system, the operation data comprises power data, and when the power data is 1.1-1.3 times of the maximum power of the inverter, the control system controls the bidirectional DC/DC direct current channel to absorb electric power.
The bidirectional DC/DC direct current channel is suitable for the efficiency optimization system of the photovoltaic power station, at least one photovoltaic string is arranged on the direct current side of the inverter, and the bidirectional DC/DC direct current channel is connected with the photovoltaic string in parallel.
The photovoltaic power station efficiency optimization system is suitable for photovoltaic power stations, the photovoltaic group string comprises N photovoltaic modules which are connected in series, and N is a natural number larger than 1.
The photovoltaic power station efficiency optimization system is suitable for a photovoltaic power station, the inverter is provided with a temperature sensor for measuring temperature data, the control system is connected with the temperature sensor to collect the temperature data, and when the temperature data exceeds a temperature threshold value, the control system reduces the load level of the inverter.
The photovoltaic power station efficiency optimization system is suitable for a photovoltaic power station efficiency optimization system, and the direct-current energy storage unit is a centralized direct-current energy storage device.
The centralized direct-current energy storage device is suitable for the efficiency optimization system of the photovoltaic power station, and comprises a plurality of series-parallel energy storage structures.
The energy storage structure is suitable for a photovoltaic power station efficiency optimization system and comprises a capacitor and a battery.
The DC/DC direct current channel is a bidirectional direct current channel under different direct current voltages.
The photovoltaic power station efficiency optimization system is suitable for a photovoltaic power station, and the control system comprises a central processing unit and a display screen.
Compared with the prior art, the invention has the following advantages:
compared with the prior art, the photovoltaic module intermittent light abandoning device has the advantage that the intermittent light abandoning generated when the power generation capacity of the photovoltaic module exceeds the power generation capacity of the inverter can be utilized. The overload level of the inverter is reduced, the temperature rise of the inverter is controlled, the energy consumption of a system is reduced, the power generation efficiency of the inverter is improved, and the service life of the inverter is prolonged. The electric energy output distribution is optimized, partial electric energy is transferred among the inverters, the performance difference among the inverters is fully utilized, the inverter with better performance can generate more electric quantity, and the utilization level of the whole photovoltaic power station equipment is better.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
FIG. 1 is a schematic diagram of a prior art photovoltaic power generation inverter power curve, ubiquitous with congenital technical light rejection phenomena;
FIG. 2 is a schematic diagram of a photovoltaic system configuration according to one embodiment of the present invention;
fig. 3 is a schematic structural diagram of a photovoltaic system according to an embodiment of the present invention.
The invention is further explained below with reference to the figures and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 3. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating understanding of the embodiments of the present invention, the following description will be made by taking specific embodiments as examples with reference to the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present invention.
For better understanding, in the prior art, as shown in fig. 1, the intermittent waste light generated by the photovoltaic module power generation capability exceeding the inverter power generation capability allows the energy to be utilized for the intermittent waste light generated by the photovoltaic module power generation capability exceeding the inverter power generation capability. The overload level of the inverter is reduced, the temperature rise of the inverter is controlled, the energy consumption of a system is reduced, the power generation efficiency of the inverter is improved, and the service life of the inverter is prolonged. The electric energy output distribution is optimized, partial electric energy is transferred among the inverters, the performance difference among the inverters is fully utilized, the inverter with better performance can generate more electric quantity, and the utilization level of the whole photovoltaic power station equipment is better. Specifically, as shown in fig. 2 to 3, the photovoltaic power plant comprises at least one inverter 1, suitable for a photovoltaic power plant efficiency optimization system comprising,
at least one bidirectional DC/DC direct current channel 2, which is provided on the direct current side of the inverter 1,
a direct current energy storage unit 3 connected to the at least one bidirectional DC/DC direct current channel 2,
and the control system 4 is connected with the at least one inverter 1 and the at least one bidirectional DC/DC direct current channel 2, and the control system 4 acquires real-time operation data of the inverter 1 and controls the bidirectional DC/DC direct current channel 2 to compensate or absorb electric power based on the operation data.
In the prior art, the photovoltaic power station efficiency optimization system is suitable for a photovoltaic power station, when the illumination condition is very good, the generating capacity of a photovoltaic module is actually larger than the available capacity of the inverter 1, and the part exceeding the capacity cannot be converted into electric energy and can only be abandoned. The invention adds a new outlet for the part of generating capacity, and stores the generating capacity exceeding the capacity of the inverter 1 in the form of direct current in the direct current energy storage.
In the preferred embodiment of the system for optimizing the efficiency of a photovoltaic power plant, the operation data includes power data, and the control system 4 controls the bidirectional DC/DC direct current channel 2 to absorb electric power when the power data is 1.1 to 1.3 times the maximum power of the inverter 1.
In the preferred embodiment suitable for the efficiency optimization system of the photovoltaic power plant, at least one photovoltaic string is arranged on the direct current side of the inverter 1, and the bidirectional DC/DC direct current channel 2 is connected in parallel with the photovoltaic string.
In the preferred embodiment of the system for optimizing the efficiency of the photovoltaic power plant, the photovoltaic string includes N photovoltaic modules connected in series, where N is a natural number greater than 1.
In the preferred embodiment of the system for optimizing the efficiency of the photovoltaic power plant, the inverter 1 is provided with a temperature sensor for measuring temperature data, the control system 4 is connected with the temperature sensor to collect the temperature data, and when the temperature data exceeds a temperature threshold, the control system 4 reduces the load level of the inverter 1. Due to long-time high-load operation, the heat accumulation condition of the core power module of the inverter 1 is serious, which can cause the problems of aging of the inverter 1 device, reduction of the internal insulation performance, reduction of the electric conversion efficiency and the like, thereby causing permanent reduction of the generating efficiency and the service life of the inverter 1. According to the invention, the energy storage system is added on the direct current side of the inverter 1, and the function of stabilizing the output can be achieved, so that the output of the inverter 1 is controlled in a more reasonable range, and the heating accumulation of the core device of the inverter 1 is controlled.
In the preferred embodiment of the efficiency optimization system for a photovoltaic power plant, the dc energy storage unit 3 is a centralized dc energy storage device.
In the preferred embodiment of the system for optimizing photovoltaic power plant efficiency, the centralized dc energy storage device includes a plurality of energy storage structures connected in series and parallel.
In the preferred embodiment of the system for optimizing the efficiency of a photovoltaic power plant, the energy storage structure comprises a capacitor and a battery.
In the preferred embodiment of the efficiency optimization system suitable for the photovoltaic power station, the energy storage structures comprise lithium batteries, lead-acid batteries, hydrogen batteries and the like, and are all energy storage devices in a direct current form, and the centralized type is an energy storage system with a large scale formed by connecting a large number of energy storage devices in series and parallel.
In the preferred embodiment of the system for optimizing the efficiency of a photovoltaic power plant, the DC/DC direct current channel 2 is a bidirectional direct current channel 2 with different direct current voltages.
In the preferred embodiment of the system for optimizing the efficiency of a photovoltaic power plant, the control system 4 comprises a central processor and a display screen. The central processing unit is used for collecting, transmitting and analyzing data and signals in the photovoltaic system, and generating and sending out control signals of the DC/DC direct current channel 2.
In the preferred embodiment of the system for optimizing the efficiency of the photovoltaic power plant, the display screen is a liquid crystal screen or a touch screen, and displays at least the temperature data of the inverter 1, the stored electric energy of the direct current energy storage unit 3, and the compensated or absorbed electric power of the bidirectional DC/DC direct current channel 2.
The DC/DC direct current channel 2 is involved in the transfer of electric energy of two direct current systems of different voltages, and can exchange redundant electric energy to the direct current energy storage unit 3 as an electric energy exchange device. Further, the DC/DC direct current channel 2 stores the electric energy which exceeds the capacity of the photovoltaic inverter 1 and cannot be sent out for alternating current power generation into direct current energy storage; when the capacity of the photovoltaic inverter 1 is not fully used, a part of electric energy in the stored energy is output to the inverter 1, and the alternating current power generation electric energy of the inverter 1 is increased. The photovoltaic inverters 1 are independent of one another, in particular on the direct current side, and are completely electrically unconnected. According to the invention, the direct current channels 2 are established on the direct current sides of different inverters 1, and an energy sharing system is established through an energy storage system.
The photovoltaic inverters 1 are mutually independent, particularly the direct current sides are not electrically connected at all, a bidirectional DC/DC channel is added on the direct current side of the inverter 1 and is connected with a set of centralized direct current energy storage, and the regulation capability of the direct current side power of the inverter 1 and the optimized flow of the direct current power between the inverters 1 are realized. The invention comprises two core components of a DC/DC direct current channel 2 and a centralized direct current energy storage and a control system 4. The control system 4 collects real-time operation data of the inverter 1, analyzes the state of the inverter 1, takes the operation state of the photovoltaic system as a target, and controls the DC/DC direct current channel 2 to compensate or absorb electric power.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. A system for optimizing the efficiency of a photovoltaic power plant, comprising,
at least one bidirectional DC/DC direct current channel provided on the DC side of the photovoltaic power plant inverter,
a direct current energy storage unit connected to the at least one bidirectional DC/DC direct current channel,
and the control system is connected with the at least one inverter and the at least one bidirectional DC/DC direct current channel, acquires real-time operation data of the inverter, and controls the bidirectional DC/DC direct current channel to compensate or absorb electric power based on the operation data.
2. The photovoltaic power plant efficiency optimization system adapted according to claim 1, wherein preferably the operation data comprises power data, and the control system controls the bi-directional DC/DC direct current channel to absorb electrical power when the power data is 1.1 to 1.3 times the maximum power of the inverter.
3. The photovoltaic power plant efficiency optimization system according to claim 1, wherein the inverter DC side is provided with at least one string of photovoltaic strings, and the bi-directional DC/DC channel connects the strings of photovoltaic strings in parallel.
4. The photovoltaic power plant efficiency optimization system according to claim 3, wherein the photovoltaic string comprises N photovoltaic modules connected in series, N being a natural number greater than 1.
5. The photovoltaic power plant efficiency optimization system according to claim 1, wherein the inverter is provided with a temperature sensor for measuring temperature data, and the control system is connected to the temperature sensor for collecting temperature data, and when the temperature data exceeds a temperature threshold, the control system reduces the inverter load level.
6. The system for optimizing efficiency for a photovoltaic power plant according to claim 1, wherein the dc energy storage unit is a centralized dc energy storage device.
7. The photovoltaic power plant efficiency optimization system according to claim 6, wherein the centralized direct current energy storage device comprises a plurality of series-parallel energy storage structures.
8. The photovoltaic power plant efficiency optimization system according to claim 7, wherein the energy storage structure comprises capacitors and batteries.
9. The photovoltaic power plant efficiency optimization system according to claim 1, wherein the DC/DC direct current channels are bidirectional direct current channels at different direct current voltages.
10. The photovoltaic power plant efficiency optimization system adapted for use according to claim 1, wherein the control system comprises a central processor and a display screen.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105245018A (en) * | 2015-09-25 | 2016-01-13 | 中国电力科学研究院 | Distributed energy storage system for improving confidence capacitance of photovoltaic power station |
| CN105490320A (en) * | 2014-09-19 | 2016-04-13 | 比亚迪股份有限公司 | Energy storage method and system for photovoltaic power station |
| CN107124004A (en) * | 2017-06-21 | 2017-09-01 | 中国华能集团清洁能源技术研究院有限公司 | A kind of photovoltaic plant DC side distributed energy storage system and operation method |
| CN110829464A (en) * | 2019-11-19 | 2020-02-21 | 国网安徽省电力有限公司 | Photovoltaic energy storage battery frequency modulation system and method based on direct current side |
| CN110915090A (en) * | 2017-05-15 | 2020-03-24 | 戴纳动力有限责任公司 | Method and system for extracting excess power |
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- 2021-02-24 CN CN202110207263.XA patent/CN112994091A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490320A (en) * | 2014-09-19 | 2016-04-13 | 比亚迪股份有限公司 | Energy storage method and system for photovoltaic power station |
| CN105245018A (en) * | 2015-09-25 | 2016-01-13 | 中国电力科学研究院 | Distributed energy storage system for improving confidence capacitance of photovoltaic power station |
| CN110915090A (en) * | 2017-05-15 | 2020-03-24 | 戴纳动力有限责任公司 | Method and system for extracting excess power |
| CN107124004A (en) * | 2017-06-21 | 2017-09-01 | 中国华能集团清洁能源技术研究院有限公司 | A kind of photovoltaic plant DC side distributed energy storage system and operation method |
| CN110829464A (en) * | 2019-11-19 | 2020-02-21 | 国网安徽省电力有限公司 | Photovoltaic energy storage battery frequency modulation system and method based on direct current side |
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