CN117375079A - Photovoltaic energy storage system - Google Patents

Photovoltaic energy storage system Download PDF

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Publication number
CN117375079A
CN117375079A CN202311330244.1A CN202311330244A CN117375079A CN 117375079 A CN117375079 A CN 117375079A CN 202311330244 A CN202311330244 A CN 202311330244A CN 117375079 A CN117375079 A CN 117375079A
Authority
CN
China
Prior art keywords
energy storage
battery device
energy
photovoltaic
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311330244.1A
Other languages
Chinese (zh)
Inventor
张庙林
王天稳
季陈
袁东
王成伟
于鹏鹃
李宇航
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Gutai New Energy Co ltd
Original Assignee
Anhui Gutai New Energy Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anhui Gutai New Energy Co ltd filed Critical Anhui Gutai New Energy Co ltd
Priority to CN202311330244.1A priority Critical patent/CN117375079A/en
Publication of CN117375079A publication Critical patent/CN117375079A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • 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
    • H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
    • 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
    • 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
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously

Abstract

The invention discloses a photovoltaic energy storage system, comprising: the system comprises a diesel generator, an energy storage inverter, a photovoltaic panel, a direct current-direct current converter, an energy storage battery device, an energy management system and a load connecting end; when the diesel generator works, the generated electric energy is preferentially supplied to the load for use, and then the rest electric energy is stored in the energy storage battery device. When the diesel generator is turned off, if the electric energy generated by the photovoltaic panel is used by a sufficient load, the rest electric energy is stored into the energy storage battery device; and if the electric energy generated by the photovoltaic panel cannot meet the use requirement of the load, controlling the energy storage battery device to output a part of electric energy to the load. Thereby greatly reducing the cost.

Description

Photovoltaic energy storage system
Technical Field
The invention relates to the technical field of new energy, in particular to a photovoltaic energy storage system.
Background
Photovoltaic energy storage systems are systems that utilize solar modules and other auxiliary devices to convert solar energy into electrical energy. Generally, the system is divided into an independent power supply system, a grid-connected power supply system and a hybrid power supply system.
In reality, in addition to using a solar photovoltaic module generator, a diesel engine is used as a hybrid standby power supply in the photovoltaic energy storage system. The purpose of using the hybrid power supply system is to comprehensively utilize the advantages of various power generation technologies and avoid the respective disadvantages. The solar independent photovoltaic system has the advantages of less maintenance and the disadvantages that the energy output depends on weather and is unstable; disadvantages of diesel engine systems are frequent maintenance and high diesel costs. Compared with a single-energy independent system, the hybrid power supply system comprehensively using the diesel generator and the solar photovoltaic power generation has the advantages that initial investment is reduced, the system is independent of weather, stable and reliable is high, and compared with a diesel engine system, maintenance and use cost is lower.
Therefore, how to save the cost in the photovoltaic energy storage system including the diesel engine is a problem to be solved.
Disclosure of Invention
Accordingly, a primary object of the present invention is to provide a photovoltaic energy storage system.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows: a photovoltaic energy storage system, comprising:
the system comprises a diesel generator, an energy storage inverter, a photovoltaic panel, a direct current-direct current converter, an energy storage battery device, an energy management system and a load connecting end; the energy storage inverter is provided with a direct current-alternating current converter, and the direct current-direct current converter is provided with a first direct current end and a second direct current end which are different; the diesel generator and the load connecting end are electrically connected to the alternating current end of the direct current-alternating current converter, the photovoltaic panel is electrically connected with the first direct current end of the direct current-direct current converter, and the second direct current end of the direct current-direct current converter and the energy storage battery device are both connected to the direct current end of the direct current-alternating current converter; the energy management system is in communication connection with the direct current-direct current converter, the energy storage battery device and the energy storage inverter;
the energy management system is used for:
when the diesel generator works and the power of the diesel generator is more than or equal to the output power of the load connecting end, controlling the energy storage inverter to input electric energy to the energy storage battery device, wherein the power=the power of the diesel generator-the output power of the load connecting end;
when the diesel generator is turned off and the power of the photovoltaic panel is more than or equal to the output power of the load connecting end, controlling the energy storage inverter to input electric energy to the energy storage battery device and controlling the power = the power of the photovoltaic panel-the output power of the load connecting end;
when the diesel generator is turned off and the power of the photovoltaic panel is less than the output power of the load connection end, the energy storage inverter and the energy storage battery device are controlled to simultaneously input electric energy to the energy storage battery device, and the output power of the energy storage battery device = the output power of the load connection end-the power of the photovoltaic panel.
As an improvement of the embodiment of the present invention, the energy management system is further configured to: and when the diesel generator works and the power of the diesel generator is smaller than the output power of the load connecting end, sending out alarm information.
As an improvement of the embodiment of the present invention, the method further includes: and the cloud server is in communication connection with the energy management system.
As an improvement of the embodiment of the invention, the cloud server is connected with the energy management system through the ethernet.
As an improvement of the embodiment of the present invention, the method further includes: and the APP is in communication connection with the energy management system.
As an improvement of the embodiment of the invention, the dc-dc converter is installed in a cabinet.
As an improvement of the embodiment of the invention, the energy storage battery device is composed of a plurality of batteries, and each battery is composed of a plurality of electric cores.
As an improvement of the embodiment of the present invention, the plurality of batteries communicate through the first CAN network.
As an improvement of the embodiment of the invention, a switch is connected in series between the energy storage battery device and the energy storage inverter, and the switch is arranged on the battery combiner box.
As an improvement of the embodiment of the invention, the energy management system is connected with the direct current-direct current converter and the energy storage inverter through an RS-485 serial bus, and the energy management system is connected with the energy storage battery device through a second CAN network.
The air heat transfer device provided by the embodiment of the invention has the following advantages: the embodiment of the invention discloses a photovoltaic energy storage system, which comprises: the system comprises a diesel generator, an energy storage inverter, a photovoltaic panel, a direct current-direct current converter, an energy storage battery device, an energy management system and a load connecting end; when the diesel generator works, the generated electric energy is preferentially supplied to the load for use, and then the rest electric energy is stored in the energy storage battery device. When the diesel generator is turned off, if the electric energy generated by the photovoltaic panel is used by a sufficient load, the rest electric energy is stored into the energy storage battery device; and if the electric energy generated by the photovoltaic panel cannot meet the use requirement of the load, controlling the energy storage battery device to output a part of electric energy to the load. Thereby greatly reducing the cost.
Drawings
Fig. 1 is a block diagram of a photovoltaic energy storage system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to embodiments shown in the drawings. The embodiment is not intended to limit the present invention, and structural, methodological, or functional modifications of the invention according to the embodiment are included in the scope of the invention.
The following description and the drawings sufficiently illustrate specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in, or substituted for, those of others. The scope of the embodiments herein includes the full scope of the claims, as well as all available equivalents of the claims. The terms "first," "second," and the like herein are used merely to distinguish one element from another element and do not require or imply any actual relationship or order between the elements. Indeed the first element could also be termed a second element and vice versa. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, apparatus, or device. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a structure, apparatus or device comprising the element. Various embodiments are described herein in a progressive manner, each embodiment focusing on differences from other embodiments, and identical and similar parts between the various embodiments are sufficient to be seen with each other.
The terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like herein refer to an orientation or positional relationship based on that shown in the drawings, merely for ease of description herein and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus are not to be construed as limiting the invention. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanically or electrically coupled, may be in communication with each other within two elements, may be directly coupled, or may be indirectly coupled through an intermediary, as would be apparent to one of ordinary skill in the art.
The embodiment of the invention provides a photovoltaic energy storage system, which is shown in fig. 1:
the energy storage system comprises a diesel generator DG, an energy storage inverter PWS, a photovoltaic panel PV, a direct current-direct current converter 2, an energy storage battery device 1, an energy management system EMS and a Load connecting end Load; the energy storage inverter PWS is provided with a direct current-alternating current converter 4, and the direct current-direct current converter is provided with a first direct current end and a second direct current end which are different; the diesel generator DG and the Load connection end Load are both electrically connected to the ac end of the dc-ac converter 4, the photovoltaic panel PV is electrically connected to the first dc end of the dc-dc converter, and the second dc end of the dc-dc converter and the energy storage battery device 1 are both connected to the dc end of the dc-ac converter 4; the energy management system EMS is in communication connection with the direct current-direct current converter, the energy storage battery device 1 and the energy storage inverter PWS; here, the diesel generator DG is provided with a diesel engine and a generator, and when the diesel engine works, the generator can be driven to generate alternating current; the dc-ac converter 4 in the energy storage inverter PWS can convert the ac power generated by the diesel generator DG into dc power, and send the dc power to the energy storage battery device 1 for storage; in addition, the diesel generator DG can be provided for use by the Load via the Load connection Load. The direct current generated by the photovoltaic panel PV is processed (e.g. transformed) by a direct current-direct current converter and then is transmitted to a direct current-alternating current converter 4, and the direct current-alternating current converter 4 converts the direct current into alternating current and then provides the alternating current for a Load through a Load connection end Load; the dc power generated by the energy storage battery device 1 is supplied to the dc-ac converter 4, and the dc-ac converter 4 converts the dc power into ac power, and then the ac power is supplied to a Load through the Load connection terminal Load.
In practice, a photovoltaic energy storage system adopting an AC (Alternating Current ) coupling scheme is generally used, and a photovoltaic panel PV is connected to an AC side of an energy storage inverter, so that not only can the output power of the photovoltaic panel PV not be directly controlled, but also the control accuracy is insufficient and the response time is long;
in the photovoltaic energy storage system of the embodiment, the output power of the photovoltaic panel PV can be directly controlled, and the photovoltaic energy storage system has the advantages of high precision and quick response; in addition, the capacity of the accessed photovoltaic is not limited by the specification of the energy storage inverter PWS, and the premise is, of course, smaller than the specification of the energy storage battery device 1 in the photovoltaic energy storage system; in addition, the photovoltaic charges the energy storage battery device 1 through the direct current-direct current converter, so that the energy storage battery device has the advantage of small loss; when the photovoltaic is not available at night, if the capacity of the energy storage battery device 1 cannot meet the load requirement for a long time, the diesel generator DG can be automatically started to supply power to the load.
The energy management system EMS is configured to:
when the diesel generator DG works and the power of the diesel generator DG is greater than or equal to the output power of the load connection end, controlling the energy storage inverter PWS to input electric energy to the energy storage battery device 1 and the power=the power of the diesel generator DG-the output power of the load connection end;
when the diesel generator DG is turned off and the power of the photovoltaic panel PV is equal to or greater than the output power of the load connection terminal, controlling the energy storage inverter PWS to input electric energy to the energy storage battery device 1 and power=the power of the photovoltaic panel PV-the output power of the load connection terminal;
when the diesel generator DG is turned off and the power of the photovoltaic panel PV is less than the output power of the load connection terminal, the energy storage inverter PWS and the energy storage battery device 1 are controlled to simultaneously input electric energy to the energy storage battery device 1, and the output power of the energy storage battery device 1=the output power of the load connection terminal-the power of the photovoltaic panel PV.
Here, when the diesel generator DG is operated, the generated electric power is preferentially supplied to the load, and then the remaining electric power is stored in the energy storage battery device 1. When the diesel generator DG is turned off, if the electric energy generated by the photovoltaic panel PV is used for a sufficient load, the remaining electric energy is stored in the energy storage battery device 1; if the power generated by the photovoltaic panel PV cannot meet the load usage, a part of the power is output to the load usage in the energy storage cell apparatus 1 is controlled. Thereby greatly reducing the cost.
In this embodiment, the energy management system EMS is further configured to: and when the diesel generator DG works and the power of the diesel generator DG is smaller than the output power of the load connecting end, sending out alarm information. In practical use, when the diesel engine specification is selected, the rated power of the diesel engine must be ensured to be larger than the load, so that once the power of the diesel generator DG is smaller than the output power of the load connection end, the diesel generator DG is indicated to be faulty.
In this embodiment, the method further includes: and the cloud server is in communication connection with the energy management system EMS. Optionally, the and server is Alpha Cloud.
In this embodiment, the cloud server is connected to the energy management system EMS through an ethernet.
In this embodiment, the method further includes: and the APP is in communication connection with the energy management system EMS. Here, APP may be used to manage the photovoltaic energy storage system.
In this embodiment, the dc-dc converter 2 is installed in a cabinet.
In this embodiment, the energy storage battery device 1 is composed of a plurality of batteries, and each battery is composed of a plurality of electric cores.
In this embodiment, the plurality of batteries communicate via a first CAN (Controller Area Network ) network.
In this embodiment, a switch Q5 is connected in series between the energy storage battery device 1 and the energy storage inverter PWS, and the switch Q5 is mounted on the battery combiner box 3.
In this embodiment, the energy management system EMS is connected to the dc-dc converter and the energy storage inverter PWS through an RS-485 serial bus, and the energy management system EMS is connected to the energy storage battery device 1 through a second CAN network.
Here, as shown in fig. 1, a switch Q1 is provided between the energy storage inverter PWS and the diesel generator DG, a switch Q2 is provided between the energy storage inverter PWS and the Load connection terminal Load, a switch Q3 is provided at the dc terminal of the dc-ac converter 4, and the connection between the dc terminal and the second dc terminal of the dc-dc converter and the connection between the dc terminal and the energy storage battery device 1 can be disconnected or connected by the switch Q3. The second dc end of the dc-dc converter is provided with a switch Q4, and the connection between the dc end of the dc-ac converter 4 and the second dc end of the dc-dc converter can be disconnected or connected by the switch Q3. Alternatively, the number of the photovoltaic panels PV may be plural, and each photovoltaic panel PV is correspondingly provided with one dc-dc converter 2.
The energy management system EMS is capable of controlling the on/off of the switches Q1, Q2, Q3, Q4 and Q5, and optionally, the energy management system EMS is connected to the switches Q1, Q2, Q3, Q4 and Q5 in a dry manner.
It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.

Claims (10)

1. A photovoltaic energy storage system, comprising:
a Diesel Generator (DG), an energy storage inverter (PWS), a photovoltaic Panel (PV), a dc-dc converter (2), an energy storage battery device (1), an Energy Management System (EMS) and a Load connection (Load); -providing a direct current to alternating current converter (4) at the energy storage inverter (PWS), the direct current to direct current converter being provided with a first and a second different direct current end; the Diesel Generator (DG) and the Load connection terminal (Load) are both electrically connected to the ac terminal of the dc-ac converter (4), the photovoltaic Panel (PV) is electrically connected to the first dc terminal of the dc-dc converter, and the second dc terminal of the dc-dc converter and the energy storage battery device (1) are both connected to the dc terminal of the dc-ac converter (4); the Energy Management System (EMS) is in communication connection with the direct current-direct current converter, the energy storage battery device (1) and the energy storage inverter (PWS);
the Energy Management System (EMS) is configured to:
when the Diesel Generator (DG) works and the power of the Diesel Generator (DG) is more than or equal to the output power of the load connection end, controlling the energy storage inverter (PWS) to input electric energy to the energy storage battery device (1) and controlling the power = the power of the Diesel Generator (DG) -the output power of the load connection end;
when the Diesel Generator (DG) is turned off and the power of the photovoltaic Panel (PV) is more than or equal to the output power of the load connection end, controlling the energy storage inverter (PWS) to input electric energy to the energy storage battery device (1) and controlling the power = the power of the photovoltaic Panel (PV) -the output power of the load connection end;
when the Diesel Generator (DG) is turned off and the power of the photovoltaic Panel (PV) is less than the output power of the load connection, the energy storage inverter (PWS) and the energy storage battery device (1) are controlled to simultaneously input electric energy to the energy storage battery device (1), and the output power of the energy storage battery device (1) =the output power of the load connection-the power of the photovoltaic Panel (PV).
2. The photovoltaic energy storage system of claim 1 wherein,
the Energy Management System (EMS) is further configured to: and when the Diesel Generator (DG) works and the power of the Diesel Generator (DG) is smaller than the output power of the load connection end, sending out alarm information.
3. The photovoltaic energy storage system of claim 1, further comprising:
and the cloud server is in communication connection with an Energy Management System (EMS).
4. A photovoltaic energy storage system according to claim 3, characterized in that:
the cloud server is connected with an Energy Management System (EMS) through an Ethernet.
5. The photovoltaic energy storage system of claim 1, further comprising:
an APP communicatively coupled to an Energy Management System (EMS).
6. The photovoltaic energy storage system of claim 1, wherein:
the DC-DC converter (2) is installed in a cabinet.
7. The photovoltaic energy storage system of claim 1, wherein:
the energy storage battery device (1) is composed of a plurality of batteries, and each battery is composed of a plurality of electric cores.
8. The photovoltaic energy storage system of claim 7, wherein:
the plurality of batteries communicate over a first CAN network.
9. The photovoltaic energy storage system of claim 7, wherein:
a switch (Q5) is connected in series between the energy storage battery device (1) and the energy storage inverter (PWS), and the switch (Q5) is mounted on the battery combiner box (3).
10. The photovoltaic energy storage system of claim 1, wherein:
the Energy Management System (EMS) is connected with the direct current-direct current converter and the energy storage inverter (PWS) through an RS-485 serial bus, and the Energy Management System (EMS) is connected with the energy storage battery device (1) through a second CAN network.
CN202311330244.1A 2023-10-13 2023-10-13 Photovoltaic energy storage system Pending CN117375079A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311330244.1A CN117375079A (en) 2023-10-13 2023-10-13 Photovoltaic energy storage system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311330244.1A CN117375079A (en) 2023-10-13 2023-10-13 Photovoltaic energy storage system

Publications (1)

Publication Number Publication Date
CN117375079A true CN117375079A (en) 2024-01-09

Family

ID=89399775

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311330244.1A Pending CN117375079A (en) 2023-10-13 2023-10-13 Photovoltaic energy storage system

Country Status (1)

Country Link
CN (1) CN117375079A (en)

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