CN114172177A - Photovoltaic power station topology and method utilizing battery and inertial energy storage system - Google Patents
Photovoltaic power station topology and method utilizing battery and inertial energy storage system Download PDFInfo
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- CN114172177A CN114172177A CN202111405476.XA CN202111405476A CN114172177A CN 114172177 A CN114172177 A CN 114172177A CN 202111405476 A CN202111405476 A CN 202111405476A CN 114172177 A CN114172177 A CN 114172177A
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- energy storage
- photovoltaic
- power
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- storage system
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- 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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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
-
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention provides a photovoltaic power station topology and a method using a battery and an inertial energy storage system, which relate to the technical field of photovoltaic power generation and comprise the following steps: an energy storage element, a bidirectional DC/DC, a flywheel energy storage system, and a photovoltaic system; the flywheel energy storage system comprises a flywheel and a generator; the energy storage element supplies power to the power grid through the bidirectional DC/DC, the flywheel system and the photovoltaic system. The topology and the method provided by the invention can relieve the technical problem of direct grid disconnection of the photovoltaic system caused by the fact that the current amplitude exceeds the amplitude upper limit of the inverter of the photovoltaic system in order to control the voltage sag.
Description
Technical Field
The invention relates to the technical field of photovoltaic power supply, in particular to a photovoltaic power station topology and a method utilizing a battery and an inertial energy storage system.
Background
The photovoltaic power generation is environment-friendly and flexible to control, the development is rapid in recent years, roof photovoltaic is integrated into a power grid, the roof photovoltaic is a good supplement and substitute for the current urban power grid power supply system, but the roof photovoltaic is directly connected into the power distribution network, so that the power distribution network which only bears power supply for users originally becomes an active power distribution network which bears the functions of load and power supply, and the permeability of the power distribution network is increased along with the continuous development of the photovoltaic system. When the power grid has a short-time fault to cause voltage sag, the photovoltaic system can not be processed like processing load, and the current amplitude increased due to the voltage sag of the power grid needs to be controlled by a method to prevent the occurrence of direct grid disconnection of the photovoltaic system caused by the fact that the current amplitude exceeds the amplitude upper limit of the inverter of the photovoltaic system.
To solve this problem, there are two types of solutions commonly used today:
(1) and designing a photovoltaic inverter control scheme. The photovoltaic inverter is controlled in different modes, so that the output current of the inverter is adjusted under the condition of voltage sag, and the stable voltage output of a photovoltaic system under the condition of voltage sag meets the regulation requirement;
(2) the photovoltaic system is integrated with an energy storage system. The photovoltaic-energy storage integrated system is utilized to perfect the connection between the power grid and the load, and the impact caused by voltage sag is reduced by means of inertia of the energy storage system under the condition of voltage sag. The function can be realized through any other capacity storage system, the energy storage system can be connected with the photovoltaic inverter when the capacity storage system is realized, the photovoltaic inverter has the function of an energy router at the same time, and the energy storage unit can also be connected to a bus of the photovoltaic system through devices such as a dynamic voltage restorer.
The former has simple form and can be realized by adjusting the control mode of the inverter; the latter is complex in situation, but is more comprehensive in function, and has the functions of energy storage and system inertia improvement besides meeting the requirement of voltage sag.
Disclosure of Invention
In view of the above, the present invention provides a photovoltaic power station topology and a method using a battery and an inertial energy storage system, so as to alleviate the technical problem of direct disconnection of a photovoltaic system caused by the fact that the current amplitude exceeds the amplitude upper limit of the photovoltaic system inverter in order to control the voltage sag.
The invention provides a photovoltaic power station topology utilizing a battery and an inertial energy storage system, comprising:
an energy storage element, a bidirectional DC/DC, a flywheel energy storage system, and a photovoltaic system;
the flywheel energy storage system comprises a flywheel and a generator;
the energy storage element supplies power to a power grid through the bidirectional DC/DC, the flywheel system and the photovoltaic system.
In another aspect, the invention provides a photovoltaic power plant method utilizing a battery and an inertial energy storage system, wherein when a power distribution network is operating normally, the photovoltaic system supplies power to an external load and supplies power to an energy storage element; when the voltage of the power distribution network drops temporarily, the photovoltaic system and the flywheel energy storage system supply power to an external load together; when the power distribution network outputs peak-valley load requirements for a long time, the photovoltaic system and the energy storage element supply power to an external power grid together.
Preferably, when a voltage dip occurs in the distribution network, the energy required by the flywheel for energy storage is the sum of S11 and S12:
t-voltage sag time;
c, connecting the photovoltaic inverter and the voltage restorer to an equivalent capacitance value on the side of a direct current bus;
Uc-a dc bus voltage;
s11, storing energy into the flywheel to increase the voltage of the distribution network;
t-photovoltaic system time constant;
PS-power delivered by the photovoltaic system;
s12, reserving the output capacity of the flywheel energy storage part to support the minimum air supply requirements of loads such as air cooling and air conditioning of a transformer in the photovoltaic power station;
the rotor speed of the flywheel energy storage system is obtained by adopting the following formula:
JM-the moment of inertia of the rotor;
ωn-the motor speed;
PM-flywheel energy storage system output power.
The embodiment of the invention has the following beneficial effects: .
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a topological diagram of a photovoltaic power plant utilizing a battery and an inertial energy storage system according to an embodiment of the present invention;
fig. 2 is a flowchart of a photovoltaic power plant method using a battery and an inertial energy storage system according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, when a voltage dip is caused by a short-time fault of a power grid, a photovoltaic system cannot be processed like processing a load, a method needs to be provided for controlling a current amplitude increased due to the voltage dip of the power grid, and the situation that the photovoltaic system is directly disconnected from the power grid due to the fact that the current amplitude exceeds the amplitude upper limit of an inverter of the photovoltaic system is prevented.
For the convenience of understanding the present embodiment, a photovoltaic power plant topology using a battery and an inertial energy storage system disclosed in the embodiment of the present invention will be described in detail first.
Example one
The embodiment of the invention provides a photovoltaic power station topology utilizing a battery and an inertial energy storage system, which comprises:
an energy storage element, a bidirectional DC/DC, a flywheel energy storage system, and a photovoltaic system;
the flywheel energy storage system comprises a flywheel and a generator;
the energy storage element supplies power to a power grid through the bidirectional DC/DC, the flywheel system and the photovoltaic system.
Example two
The second embodiment of the invention provides a photovoltaic power station method utilizing a battery and an inertial energy storage system,
further, when the power distribution network normally operates, the photovoltaic system supplies power to an external load and supplies power to the energy storage element;
specifically, in the embodiment provided by the invention, the photovoltaic system partially supports energy storage requirements of an energy storage element and a flywheel energy storage system, the energy storage element system can enter a cold standby state after meeting the charging requirement without long-term working, the flywheel energy storage system simultaneously outputs load energy requirements of an air conditioner and the like, and the energy of the flywheel energy storage system is in a dynamic balance state of input and output of an external system and is used as a hot standby state; namely: in the daytime, the flywheel system works only by ensuring that the battery system is fully charged; and the energy storage system is started in the evening, and the flywheel energy storage system only reserves and supports the minimum air supply requirements of loads such as air cooling of a transformer, air conditioning and the like in the photovoltaic power station.
When the voltage of the power distribution network drops temporarily, the photovoltaic system and the flywheel energy storage system supply power to an external load together;
when the power distribution network outputs peak-valley load requirements for a long time, the photovoltaic system and the energy storage element supply power to an external power grid together.
Preferably, when a voltage dip occurs in the distribution network, the energy required by the flywheel for energy storage is the sum of S11 and S12:
t-voltage sag time;
c, connecting the photovoltaic inverter and the voltage restorer to an equivalent capacitance value on the side of a direct current bus;
UC-a dc bus voltage;
s11, storing energy into the flywheel to increase the voltage of the distribution network;
t-photovoltaic system time constant;
PS-power delivered by the photovoltaic system;
s12, reserving the output capacity of the flywheel energy storage part to support the minimum air supply requirements of loads such as air cooling and air conditioning of a transformer in the photovoltaic power station;
the rotor speed of the flywheel energy storage system is obtained by adopting the following formula:
JM-the moment of inertia of the rotor;
ωn-the motor speed;
PMflywheel energy storageThe system outputs power.
The invention has the following advantages:
(1) the cost is relatively reduced. The newly-built chemical energy storage system is independent from the original fan system, and the investment of the newly-built chemical energy storage system is independent from the investment of the original fan system. The invention replaces the original fan host machine part with the flywheel system, combines partial functions of the fan with the energy storage system, and relatively reduces the cost. And flywheel energy storage has matured in fields such as automobiles, and although the energy storage power is small relative to a battery, instantaneous problems such as voltage sag and the like are sufficiently supported.
(3) The service life is long. The inertial energy storage system is a mechanical system, and the service life of the inertial energy storage system is generally far longer than that of a chemical energy storage system.
Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A photovoltaic power plant topology utilizing a battery and an inertial energy storage system, comprising:
an energy storage element, a bidirectional DC/DC, a flywheel energy storage system, and a photovoltaic system;
the flywheel energy storage system comprises a flywheel and a generator;
the energy storage element supplies power to a power grid through the bidirectional DC/DC, the flywheel system and the photovoltaic system.
2. A photovoltaic power plant method utilizing batteries and inertial energy storage system employing the photovoltaic power plant topology utilizing batteries and inertial energy storage system of claim 1,
when the power distribution network normally operates, the photovoltaic system supplies power to an external load and supplies power to the energy storage element;
when the voltage of the power distribution network drops temporarily, the photovoltaic system and the flywheel energy storage system supply power to an external load together;
when the power distribution network outputs peak-valley load requirements for a long time, the photovoltaic system and the energy storage element supply power to an external power grid together.
3. The method of claim 2, wherein when a voltage sag occurs in the distribution network, the flywheel energy storage needs to provide energy of the sum of S11 and S12:
t-voltage sag time;
c, connecting the photovoltaic inverter and the voltage restorer to an equivalent capacitance value on the side of a direct current bus;
UC-DC busLine voltage;
s11, storing energy into the flywheel to increase the voltage of the distribution network;
t-photovoltaic system time constant;
PS-power delivered by the photovoltaic system;
s12, reserving the output capacity of the flywheel energy storage part to support the minimum air supply requirements of loads such as air cooling and air conditioning of a transformer in the photovoltaic power station;
the rotor speed of the flywheel energy storage system is obtained by adopting the following formula:
JM-the moment of inertia of the rotor;
ωn-the motor speed;
PM-flywheel energy storage system output power.
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| CN202111405476.XA CN114172177A (en) | 2021-11-24 | 2021-11-24 | Photovoltaic power station topology and method utilizing battery and inertial energy storage system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141066A (en) * | 2007-09-07 | 2008-03-12 | 华北电力大学 | Method for regulating and controlling renewable energy resources power generation system by flywheel accumulation energy device |
| CN103560542A (en) * | 2013-11-18 | 2014-02-05 | 沈阳工业大学 | Method and device for restraining power fluctuation of wind generation set based on flywheel energy storage |
| CN105515019A (en) * | 2016-01-19 | 2016-04-20 | 盾石磁能科技有限责任公司 | Method and system for increasing micro-grid operation reliability |
| CN210490481U (en) * | 2019-11-20 | 2020-05-08 | 盾石磁能科技有限责任公司 | Dynamic voltage restorer based on short-time high-frequency secondary flywheel energy storage system |
| CN111404199A (en) * | 2020-04-22 | 2020-07-10 | 江苏东源电器集团股份有限公司 | Micro-grid hybrid energy storage system based on flywheel energy storage and control method |
-
2021
- 2021-11-24 CN CN202111405476.XA patent/CN114172177A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141066A (en) * | 2007-09-07 | 2008-03-12 | 华北电力大学 | Method for regulating and controlling renewable energy resources power generation system by flywheel accumulation energy device |
| CN103560542A (en) * | 2013-11-18 | 2014-02-05 | 沈阳工业大学 | Method and device for restraining power fluctuation of wind generation set based on flywheel energy storage |
| CN105515019A (en) * | 2016-01-19 | 2016-04-20 | 盾石磁能科技有限责任公司 | Method and system for increasing micro-grid operation reliability |
| CN210490481U (en) * | 2019-11-20 | 2020-05-08 | 盾石磁能科技有限责任公司 | Dynamic voltage restorer based on short-time high-frequency secondary flywheel energy storage system |
| CN111404199A (en) * | 2020-04-22 | 2020-07-10 | 江苏东源电器集团股份有限公司 | Micro-grid hybrid energy storage system based on flywheel energy storage and control method |
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