CN215817553U - Platform district level photovoltaic energy storage microgrid structure - Google Patents

Platform district level photovoltaic energy storage microgrid structure Download PDF

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Publication number
CN215817553U
CN215817553U CN202121684762.XU CN202121684762U CN215817553U CN 215817553 U CN215817553 U CN 215817553U CN 202121684762 U CN202121684762 U CN 202121684762U CN 215817553 U CN215817553 U CN 215817553U
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China
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energy storage
household
photovoltaic
microgrid
electric meter
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张克勇
王冠瑞
耿新
胡松杰
刘娟
贾子昊
艾晓雨
雷飒
董莹莹
李肖可
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Pingdingshan Power Supply Co of State Grid Henan Electric Power Co Ltd
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Pingdingshan Power Supply Co of State Grid Henan Electric Power Co Ltd
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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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • 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
    • 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

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Abstract

The utility model relates to the technical field of microgrid structures, and provides a district-level photovoltaic energy storage microgrid structure which comprises N household microgrid structures and a distribution transformer, wherein each household microgrid structure comprises a main switch, a household energy terminal, a first intelligent ammeter, a second intelligent ammeter, a household load and a household photovoltaic system, one end of the main switch is connected with the distribution transformer, the other end of the main switch is connected with the first intelligent ammeter, the first intelligent ammeter is connected with the load and used for acquiring the electricity consumption information of the load and sending the electricity consumption information to the household energy terminal, the other end of the main switch is also connected with the second intelligent ammeter, the second intelligent ammeter is connected with the household photovoltaic system and used for acquiring the electricity sales information of an energy storage unit of the household photovoltaic system and sending the electricity sales information of the energy storage unit to the household energy terminal, so that the household microgrid structures are divided, and each family micro-grid structure is conveniently and independently coordinated and scheduled.

Description

Platform district level photovoltaic energy storage microgrid structure
Technical Field
The utility model relates to the technical field of microgrid structures, in particular to a platform area level photovoltaic energy storage microgrid structure.
Background
At present, photovoltaic power generation has two coexistence modes, namely 'decentralized development, medium and low voltage access and local consumption' and 'centralized development, medium and high voltage access and external delivery and consumption'. The large-scale photovoltaic access influences the active frequency characteristic, the reactive voltage characteristic and the power angle stability of a system, and as grid-connected inverters are mostly power electronic devices and belong to nonlinear loads, the problems of over-standard harmonic waves, resonance and the like can be caused in certain scenes. In addition, the fault characteristics of the distribution network are changed due to the large-scale access of distributed photovoltaic, the sensitivity and the accuracy of the relay protection and the automatic device of the distribution network are affected, and when a platform area or a line is overhauled due to power failure, if the photovoltaic grid-connected control device is not normally disconnected, reverse power transmission can be generated to cause safety threats to overhaul operators. Furthermore, the distributed light-storage units are relatively small in capacity and are distributed in installation locations, and the capacity of a single unit is extremely limited. Therefore, with the increase of the photovoltaic grid-connected capacity and the light abandoning phenomenon, the existing grid-connected system is poor in coordination and scheduling.
SUMMERY OF THE UTILITY MODEL
The utility model provides a platform area level photovoltaic energy storage micro-grid structure, which aims to solve the problem of poor coordination and scheduling of the existing distribution network system.
In order to achieve the purpose, the utility model is realized by the following technical scheme:
the utility model provides a transformer area level photovoltaic energy storage micro-grid structure, which comprises N household micro-grid structures and a distribution transformer, wherein N is a positive integer, the household micro-grid structure comprises a main switch, a household energy terminal, a first intelligent electric meter, a second intelligent electric meter, a household load and a household photovoltaic system, one end of the main switch is connected with the distribution transformer, the other end of the main switch is connected with the first intelligent electric meter, the first intelligent electric meter is connected with the household load and used for acquiring the electricity consumption information of the household load and sending the electricity consumption information to the household energy terminal, the other end of the main switch is also connected with the second intelligent electric meter, the second intelligent electric meter is connected with the household photovoltaic system and used for acquiring the electricity sales information of an energy storage unit of the household photovoltaic system and sending the electricity sales information of the energy storage unit to the household energy terminal, the first intelligent electric meter and the second intelligent electric meter are connected with the household energy terminal.
Optionally, the household microgrid structure further comprises an energy storage system, and the energy storage system and the household photovoltaic system are connected in parallel at an output end and then connected with the second smart electric meter.
Optionally, in the N home microgrid structures, the home energy terminals of two adjacent home microgrid structures are in communication connection.
Optionally, the system further comprises a PCC grid-connected switch, and the distribution transformer is connected to the power grid through the PCC grid-connected switch.
Optionally, the system further comprises a common service class load, wherein the common service class load is connected with the distribution transformer.
Optionally, the photovoltaic system further comprises a plurality of independent photovoltaic stations and photovoltaic substations corresponding to the independent photovoltaic stations one to one, and the photovoltaic substations are connected with the independent photovoltaic stations.
Optionally, the system further comprises a plurality of independent energy storage stations and energy storage substations corresponding to the independent energy storage stations one to one, and the energy storage substations are connected with the independent energy storage stations.
Optionally, the photovoltaic substation further comprises a master station, and the master station is in communication connection with the distribution transformer and the photovoltaic substation.
Optionally, the capacity of the photovoltaic system in the home microgrid is 10 kW.
Optionally, the capacity of the energy storage system in the home microgrid is 5kW/5 kWh.
Has the advantages that:
the utility model provides a platform region level photovoltaic energy storage micro-grid structure, which comprises N household micro-grid structures and a distribution transformer, wherein N is a positive integer, wherein the household micro-grid structure comprises a main switch, a household energy terminal, a first intelligent electric meter, a second intelligent electric meter, a household load and a household photovoltaic system, one end of the main switch is connected with the distribution transformer, the other end of the main switch is connected with the first intelligent electric meter, the first intelligent electric meter is connected with the household load, the household energy management system is used for acquiring the electricity consumption information of the household load and sending the electricity consumption information to the household energy terminal, the other end of the main switch is also connected with a second intelligent electric meter, the second intelligent electric meter is connected with the photovoltaic system, the system is used for acquiring the information of the electricity selling quantity of the energy storage unit of the photovoltaic system and sending the information of the electricity selling quantity of the energy storage unit to the household energy terminal, the first intelligent electric meter and the second intelligent electric meter are connected with the household energy terminal. Therefore, the household micro-grid structures are divided, and each household micro-grid structure is conveniently and independently coordinated and scheduled.
Drawings
Fig. 1 is a structural diagram of a platform-level photovoltaic energy storage microgrid structure according to a preferred embodiment of the present invention.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. 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.
As shown in fig. 1, the present invention provides a platform-level photovoltaic energy storage microgrid structure, which comprises N household microgrid structures and a distribution transformer, where N is a positive integer, wherein the household micro-grid structure comprises a main switch, a household energy terminal, a first intelligent electric meter, a second intelligent electric meter, a household load and a household photovoltaic system, one end of the main switch is connected with the distribution transformer, the other end of the main switch is connected with the first intelligent electric meter, the first intelligent electric meter is connected with the household load, the household energy management system is used for acquiring the electricity consumption information of the household load and sending the electricity consumption information to the household energy terminal, the other end of the main switch is also connected with a second intelligent electric meter, the second intelligent electric meter is connected with a household photovoltaic system, the system comprises a household energy terminal, a first intelligent electric meter and a second intelligent electric meter, wherein the household energy terminal is used for acquiring the electricity selling amount information of an energy storage unit of a household photovoltaic system and sending the electricity selling amount information of the energy storage unit to the household energy terminal, and the first intelligent electric meter and the second intelligent electric meter are both connected with the household energy terminal.
The platform area level photovoltaic energy storage micro-grid structure divides the family micro-grid structure, and is convenient for independently carrying out coordination scheduling on each family micro-grid structure.
Optionally, the household microgrid structure further comprises an energy storage system, and the energy storage system and the household photovoltaic system are connected in parallel at the output end and then connected with the second smart electric meter.
Specifically, the capacity of a household distributed photovoltaic system complete device is usually about 10kW, and solar energy can be converted into 220V single-phase power frequency alternating current or 380V three-phase power frequency alternating current. The capacity of a household distributed energy storage system complete device is usually about 5kW/5kWh, and the household distributed energy storage system complete device mainly plays a role in charging in a photovoltaic power generation peak period or a power price valley and discharging in a photovoltaic power output shortage or power price peak period, so that the overall power consumption cost of a user is reduced, and the self-sufficient rate of power consumption of the user is improved. The running states of the household distributed photovoltaic and the household distributed energy storage are controlled by the household energy control terminal.
Optionally, in the N home microgrid structures, the home energy terminals of two adjacent home microgrid structures are connected.
In this optional embodiment, the household energy terminals of two adjacent household microgrid structures are connected, so that the stability of the whole microgrid can be improved, for example, the household a is respectively adjacent to the household B and the household C, and the household B is adjacent to the household C, so that a connection relationship exists between the household a and the household B, a connection relationship exists between the household B and the household C, and a connection relationship exists between the household a and the household C, so that when the connection relationship between the household a and the household C fails, if the information of the household a needs to be sent to the household C, the information of the household a can be sent to the household B, and the information can be further sent to the household C to realize normal transmission of the information.
Optionally, the system further comprises a PCC grid-connected switch, and the distribution transformer is connected with the power grid through the PCC grid-connected switch. Thus, a common service class load may optionally be included, the common service class load being connected to the distribution transformer.
Optionally, the photovoltaic system further comprises a plurality of independent photovoltaic stations and photovoltaic substations corresponding to the independent photovoltaic stations one to one, and the photovoltaic substations are connected with the independent photovoltaic stations.
Optionally, the system further comprises a plurality of independent energy storage stations and energy storage substations corresponding to the independent energy storage stations one to one, and the energy storage substations are connected with the independent energy storage stations.
In this alternative embodiment, the capacity of the independent photovoltaic station is typically 20kW to 200kW, and the inverter system mainly including photovoltaic cells communicates with the microgrid control master station through a dedicated control substation. The capacity of the independent small-sized energy storage station is usually 20kW/20kWh-200kW/200kWh, the independent small-sized energy storage station mainly comprises a battery body, a battery management system and a bidirectional conversion system, and the independent small-sized energy storage station is also communicated with the micro-grid control main station through a special control substation. The battery body can be a lithium ion battery or a lead-acid battery.
Optionally, the photovoltaic substation also comprises a main station, wherein the main station is in communication connection with the distribution transformer and the photovoltaic substation.
In other possible embodiments, the master switch may be an in-home master switch. The home-entrance main switch is the only interface for connecting the household micro-grid structure with the public low-voltage distribution network. The resident load in the household is connected to the household side of the household main switch through a smart meter for measuring the electricity consumption of the resident load. After the user distributed photovoltaic system complete device and the user distributed energy storage system complete device are connected in parallel at the output end, the user distributed photovoltaic system complete device and the user distributed energy storage system complete device are also connected to the household side of the household main switch through a bidirectional charging type intelligent ammeter for metering the electricity sold (purchased) by the distributed photovoltaic energy storage units. Through the wiring mode, the resident load in the household micro-grid subsystem is ensured to have two paths of power supplies, one path is a public low-voltage distribution network, and the other path is a light storage unit formed by a household distributed photovoltaic system complete device and a household distributed energy storage system complete device.
The household energy terminal is a control center of the household micro-grid subsystem. When the public low-voltage distribution network is powered off, the household energy terminal can disconnect the user incoming line main switch, and power is continuously supplied to internal local resident loads through the internal communication network by utilizing internal household distributed photovoltaic and household distributed energy storage, so that the household micro-grid subsystem operates independently, and the power supply reliability of resident families is improved.
When the public low-voltage distribution network is normal, the household energy terminal closes the user inlet wire main switch, so that the household micro-grid subsystem is operated in a grid-connected mode. And coordinating all the distributed energy storage units to charge and discharge in proportion according to self capacity. And finally, the maximum consumption of photovoltaic power generation is realized, and the voltage of each node and the power flow of a grid-connected point are ensured to meet the requirements issued by the micro-grid control master station.
The internal communication network of the household micro-grid structure means that a household energy control terminal is communicated with a photovoltaic power generation system and an energy storage system in the household micro-grid in an RS485 serial port mode, detects the operation state of photovoltaic and/or energy storage, and controls the output of the photovoltaic and the charging and discharging power value of the energy storage; the communication mode of the distributed communication network communicated in the household micro-grid structure CAN adopt a wired serial port communication mode such as RS485 or CAN protocol, and CAN also adopt a wireless communication mode such as Zig-Bee or 4G, 5G.
The communication mode of the master station and other devices CAN adopt a wired serial port communication mode such as RS485 or CAN protocol, and CAN also adopt a wireless communication mode such as Zig-Bee or 4G, 5G. This is by way of example only and not by way of limitation.
According to the platform area level photovoltaic energy storage microgrid structure, the energy storage devices are integrated in the distributed photovoltaic units, and the platform area level photovoltaic energy storage microgrid structure, a low-voltage distribution network, a local load, a corresponding control system and the like form a photovoltaic energy storage microgrid. The power fluctuation of the distributed photovoltaic system can be stabilized, the active and reactive capacities provided by the energy storage device can be utilized, the redundant power can be locally consumed, the reactive demand of the system can be compensated, and the system has important effects on the aspects of improving the voltage distribution of the system, smoothing the power flow of the PCC points and the like. And when the main network fails and has power failure, the optical storage micro-grid can also operate in an isolated island manner, so that uninterrupted power supply of important loads in the system is ensured, and the power supply reliability is improved.
The foregoing detailed description of the preferred embodiments of the utility model has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (10)

1. The utility model provides a district level photovoltaic energy storage microgrid structure, its characterized in that, includes N family microgrid structures and distribution transformer, and N is the positive integer, wherein, family microgrid structure includes master switch, family energy terminal, first smart electric meter, second smart electric meter, family load and family photovoltaic system, the one end of master switch with distribution transformer connects, the other end of master switch with first smart electric meter is connected, first smart electric meter with the family load is connected for acquire the power consumption information of family load and with power consumption information transmission to the family energy terminal, the other end of master switch still with the second smart electric meter is connected, the second smart electric meter with the family photovoltaic system is connected for acquire the energy storage unit of family photovoltaic system sells electric quantity information and with energy storage unit sells electric quantity information transmission to the family energy terminal, the first intelligent electric meter and the second intelligent electric meter are connected with the household energy terminal.
2. The district-level photovoltaic energy-storage microgrid structure of claim 1, further comprising an energy storage system, wherein the energy storage system and the household photovoltaic system are connected in parallel at output ends and then connected with the second smart electric meter.
3. The platform-level photovoltaic energy storage microgrid structure of claim 1, wherein household energy terminals of two adjacent household microgrid structures in the N household microgrid structures are in communication connection.
4. The platform level photovoltaic energy storage microgrid structure of claim 1, further comprising a PCC grid-connected switch through which the distribution transformer is connected to a power grid.
5. The platform level photovoltaic energy storage microgrid structure of claim 1, further comprising a common service class load connected with the distribution transformer.
6. The platform level photovoltaic energy storage microgrid structure of claim 1, further comprising a plurality of independent photovoltaic stations and photovoltaic substations corresponding to the independent photovoltaic stations one to one, the photovoltaic substations being connected with the independent photovoltaic stations.
7. The platform area level photovoltaic energy storage microgrid structure of claim 6, further comprising a plurality of independent energy storage stations and energy storage substations corresponding to the independent energy storage stations one by one, wherein the energy storage substations are connected with the independent energy storage stations.
8. The platform level photovoltaic energy storage microgrid structure of claim 7, further comprising a master station, wherein the master station is in communication connection with the distribution transformer, the photovoltaic substations and the energy storage substations.
9. The platform level photovoltaic energy storage microgrid structure of claim 1, wherein a capacity of a photovoltaic system in the home microgrid is 10 kW.
10. The platform level photovoltaic energy storage microgrid structure of claim 2, wherein a capacity of an energy storage system in the home microgrid is 5kW/5 kWh.
CN202121684762.XU 2021-07-20 2021-07-20 Platform district level photovoltaic energy storage microgrid structure Active CN215817553U (en)

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CN202121684762.XU CN215817553U (en) 2021-07-20 2021-07-20 Platform district level photovoltaic energy storage microgrid structure

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Application Number Priority Date Filing Date Title
CN202121684762.XU CN215817553U (en) 2021-07-20 2021-07-20 Platform district level photovoltaic energy storage microgrid structure

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CN215817553U true CN215817553U (en) 2022-02-11

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