CN115173393A - Distributed photovoltaic power generation direct-current power supply system and working method thereof - Google Patents
Distributed photovoltaic power generation direct-current power supply system and working method thereof Download PDFInfo
- Publication number
- CN115173393A CN115173393A CN202210726684.8A CN202210726684A CN115173393A CN 115173393 A CN115173393 A CN 115173393A CN 202210726684 A CN202210726684 A CN 202210726684A CN 115173393 A CN115173393 A CN 115173393A
- Authority
- CN
- China
- Prior art keywords
- power supply
- distributed
- direct current
- supply system
- units
- 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
Links
Images
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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/12—Parallel operation of dc generators with converters, e.g. with mercury-arc rectifier
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/08—Three-wire systems; Systems having more than three wires
- H02J1/082—Plural DC voltage, e.g. DC supply voltage with at least two different DC voltage levels
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model provides a distributed photovoltaic power generation direct current power supply system and a working method thereof, comprising the following steps: the photovoltaic power generation system comprises a distributed power generation system, a direct current voltage stabilizing system and an energy storage system, wherein the output end of the distributed photovoltaic power generation system is connected to the input end of the direct current voltage stabilizing system, and the second output end of the direct current voltage stabilizing system is electrically connected with the energy storage system; the distributed power generation system acquires the direct current bus current of the distributed direct current power supply system; obtaining the number of conversion power supply units meeting the power supply requirement of a load according to the direct current bus current and the rated capacity of the conversion power supply units in the distributed direct current power supply system; and adjusting the switching power supply units started in the distributed direct current power supply system according to the number of the switching power supply units, so that the cost of the uninterrupted power supply system is saved.
Description
Technical Field
The disclosure relates to the technical field of distributed direct current power supply, in particular to a distributed photovoltaic power generation direct current power supply system and a working method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, the distributed power supply system which is most widely applied is a photovoltaic power generation project built on the roof of an urban building, and the existing distributed direct-current power supply system generates direct current through the distributed photovoltaic power generation system, converts the direct current into a standard alternating-current power supply through an inverter, provides electric energy for using electric appliances and can be connected to the grid. The distributed photovoltaic power generation system is a novel power generation and energy comprehensive utilization mode with a wide development prospect, advocates the principles of near power generation, near grid connection, near conversion and near use, can effectively improve the generated energy of photovoltaic power stations with the same scale, and effectively solves the problem of loss of electric power in boosting and long-distance transportation.
Generally, after a distributed photovoltaic power generation system generates power, the generated electric energy converts direct current into alternating current power and transmits the alternating current power to direct current electrical appliances through inverters, and each direct current electrical appliance is provided with an independent rectifier to convert the alternating current power into direct current power again for the direct current electrical appliances to use. The direct current is inverted into an alternating current power supply, energy loss is generated, then the alternating current power supply is converted into the direct current power supply in the using process of the direct current electric appliance, loss is generated, and a large amount of electric energy is consumed due to double loss.
In addition, the uninterruptible power supply system mainly adopts a centralized power supply architecture, the number of uninterruptible power supply equipment and storage battery packs included in the uninterruptible power supply system is relatively fixed, the uninterruptible power supply systems of different ICT equipment are independent of each other, and after the uninterruptible power supply system reaches the configured maximum capacity, if the rated capacity needs to be increased, the number of uninterruptible power supply equipment and storage battery packs generally needs to be increased, and extra space and cost need to be increased. In addition, when the uninterruptible power supply system has a fault, for example, a storage battery pack has a fault, the power supply of the ICT equipment is affected, and the reliability of the uninterruptible power supply system is reduced.
Disclosure of Invention
The present disclosure provides a distributed photovoltaic power generation dc power supply system and a working method thereof to solve the above problems, and the present disclosure reduces power loss due to inversion and rectification processes, and easily realizes energy storage.
According to some embodiments, the following technical scheme is adopted in the disclosure:
a distributed photovoltaic power generation direct current power supply system includes:
the photovoltaic power generation system comprises a distributed power generation system, a direct current voltage stabilizing system and an energy storage system, wherein the output end of the distributed photovoltaic power generation system is connected to the input end of the direct current voltage stabilizing system, and the second output end of the direct current voltage stabilizing system is electrically connected with the energy storage system;
the distributed power generation system includes:
the acquisition unit is used for acquiring the direct current bus current of the distributed direct current power supply system;
the obtaining unit is used for obtaining the number of the conversion power supply units meeting the load power supply requirement according to the direct current bus current and the rated capacity of the conversion power supply units in the distributed direct current power supply system;
and the adjusting unit is used for adjusting the switching power supply units which are started in the distributed direct current power supply system according to the number of the switching power supply units.
According to other embodiments, the following technical scheme is adopted in the disclosure:
a working method of a distributed photovoltaic power generation direct current power supply system comprises the following steps:
acquiring direct current bus current of a distributed direct current power supply system; obtaining the number of conversion power supply units meeting the power supply requirement of a load according to the direct current bus current and the rated capacity of the conversion power supply units in the distributed direct current power supply system;
and adjusting the switched power supply units which are started in the distributed direct current power supply system according to the number of the switched power supply units.
Compared with the prior art, the beneficial effect of this disclosure is:
the method and the device can obtain the direct current bus current of the distributed direct current power supply system, obtain the number of the conversion power supply units meeting the load power supply requirement according to the direct current bus current and the rated capacity of the conversion power supply units in the distributed direct current power supply system, and then adjust the conversion power supply units started in the distributed direct current power supply system according to the number of the conversion power supply units so as to save the cost of the uninterrupted power supply system.
After the distributed photovoltaic power generation system generates power, the generated direct current directly passes through the direct current voltage stabilizing system to generate a continuous and stable direct current power supply with a plurality of voltage levels, the direct current power supply is directly used by a direct current electrical appliance, an inverter and a rectifier are not needed, the electric energy loss caused by inversion and rectification processes is greatly reduced, the utilization rate of the distributed photovoltaic power generation system is improved, and an energy storage system is provided, so that energy storage can be easily realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 is a functional block diagram of a distributed photovoltaic power generation DC power supply system;
fig. 2 is a schematic flow diagram of a method of operation of the distributed dc power supply system;
the specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1
An embodiment of the present disclosure provides a distributed photovoltaic power generation dc power supply system, including distributed photovoltaic power generation system, dc voltage stabilization system and energy storage system, the input of dc voltage stabilization system is connected to the output of distributed photovoltaic power generation system, dc power is output to the first output of dc voltage stabilization system, the second output of dc voltage stabilization system and energy storage system electric connection.
As shown in fig. 1, the energy storage system includes a charge and discharge device and a storage battery, an input end of the charge and discharge device is electrically connected to a second output end of the dc voltage stabilization system, and an output end of the charge and discharge device is electrically connected to the storage battery.
As shown in fig. 1, the dc power supply includes a plurality of voltage levels suitable for dc appliances with different input voltages.
Distributed photovoltaic power generation system turns into the electric energy with solar energy, and the electric energy passes through direct current voltage stabilizing system with direct current's form, divide into two way outputs, and the first output lasts stable DC power supply who has a plurality of voltage levels, supplies the direct current electrical apparatus of different input voltage to use, and energy storage system is connected to the second output, carries out the energy storage to the battery through charge-discharge device, and when evening or when not having the sun, the battery begins to discharge, lasts for the direct current electrical apparatus power supply.
The distributed direct-current power supply system comprises a plurality of conversion power supply units, a plurality of storage battery units, a plurality of power distribution units (PDU for short) and a direct-current bus. Each conversion power supply unit and each storage battery unit are connected in parallel on a direct current bus, the direct current bus 101 is connected with each PDU, and power is supplied to a load, such as ICT equipment, through each PDU. Each conversion power supply unit, each storage battery unit and each PDU are respectively arranged in a plurality of cabinets, and the respective quantity of the conversion power supply units, the storage battery units and the PDUs arranged in each cabinet is determined according to the load arranged in the cabinet. Based on the distributed dc power supply system, the embodiment of the present disclosure provides a control method for a distributed dc power supply system, which can implement unified scheduling and use of energy between different cabinets.
Example 2
Another embodiment of the present disclosure provides a working method of a distributed photovoltaic power generation dc power supply system, as shown in fig. 2, including:
s201, acquiring direct current bus current of a distributed direct current power supply system;
specifically, when the external power supply is normally powered, and the distributed dc power supply system is started to supply power to the load, all the switching power supply units are turned on, and a control device (hereinafter referred to as a control device) of the distributed dc power supply system may obtain a dc bus current through a current transformer installed on the dc bus.
S202, obtaining the number of conversion power supply units meeting the power supply requirement of a load according to the direct current bus current and the rated capacity of the conversion power supply units in the distributed direct current power supply system;
specifically, after obtaining the dc bus current, the control device may obtain the number of switching power supply units that need to be turned on under the condition that the load power supply requirement is met according to the dc bus current and the rated capacity of the switching power supply unit. Wherein a rated capacity of the switching power supply unit and a rated capacity of the switching power supply unit are preset.
For example, after obtaining the dc bus current I, the control device may obtain the dc bus current I according to the formula:
N＝I/(A×Y)
and calculating the number N of the conversion power supply units meeting the power supply requirement of the load, wherein A represents the rated capacity of the conversion power supply units, Y represents the optimal efficiency point control load rate of the conversion power supply units, and A and Y are preset.
S203, adjusting the switched power supply units which are started in the distributed direct current power supply system according to the number of the switched power supply units.
Specifically, after obtaining the number of switching power supply units meeting the load power supply requirement, the control device compares the number Q1 of switching power supply units meeting the load power supply requirement with the number Q2 of switching power supply units which are already turned on, turns off the switching power supply units of the number obtained by subtracting Q1 from Q2, and operates the remaining Q1 switching power supply units. The switched-off power supply unit is set according to practical experience, and the embodiment of the disclosure is not limited.
For example, the distributed dc power supply system includes 100 switching power supply units distributed on a plurality of cabinets, and when the distributed dc power supply system is started, all of the 100 switching power supply units are turned on. The control device obtains that the number of the switching power supply units meeting the load power supply requirement is 60, the control device compares the number of the switching power supply units which are started up with the number of the switching power supply units which are required to be 60 to obtain that 40 switching power supply units are required to be turned off, and the control device can randomly select 40 switching power supply units from 100 switching power supply units to be turned off.
According to the control method of the distributed direct-current power supply system, the direct-current bus current of the distributed direct-current power supply system can be obtained, the number of the conversion power supply units meeting the load power supply requirement is obtained according to the direct-current bus current and the rated capacity of the conversion power supply units in the distributed direct-current power supply system, and then the conversion power supply units started in the distributed direct-current power supply system are adjusted according to the number of the conversion power supply units, so that the cost of the uninterrupted power supply system is saved.
Obtaining the number of the storage battery units meeting the power supply requirement of the load according to the direct current bus current, the backup time of the distributed direct current power supply system and the rated capacity of the storage battery units in the distributed direct current power supply system; wherein the backup time is preset;
specifically, the backup time of the distributed dc power supply system is a time period for maintaining the normal operation of the load through a certain number of battery cells when the external power supply is disconnected. The control device may obtain the number of battery cells required to satisfy the load power supply demand, based on the dc bus current, the backup time, and the rated capacity of the battery cells. Wherein the backup time and the rated capacity of the battery unit are preset.
For example, the control device obtains the dc bus current I, the backup time T of the distributed dc power supply system, and the rated capacity B of the battery cells, and may calculate the number M of battery cells satisfying the load power supply requirement according to the formula M = K × I × T/(B × K × η), where K represents a safety factor of the battery cells and η represents a discharge coefficient of the battery cells. K and eta are set according to actual experience, and the embodiment of the disclosure is not limited; b and T are preset.
And setting backup storage battery units in the distributed direct current power supply system according to the number of the storage battery units.
Specifically, after obtaining the number of battery units meeting the power supply requirement of the load, the control device allocates a corresponding number of battery units to the load, and fully charges and ensures the corresponding number of battery units, so that when the external power supply stops, the load can be maintained to operate for the backup time through the corresponding number of battery units. Wherein the respective number of battery cells may originate from different of the cabinets.
On the basis of the foregoing embodiments, further, the obtaining, according to the dc bus current, the backup time of the distributed dc power supply system, and the rated capacity of the storage battery units in the distributed dc power supply system, the number of storage battery units that meet the power supply demand of the load includes:
and calculating the number M of the storage battery units meeting the power supply requirement of the load according to a formula M = K multiplied by I multiplied by T/(B multiplied by K multiplied by eta), wherein K represents the safety coefficient of the storage battery units, I represents the direct current bus current, T represents the backup time of the distributed direct current power supply system, B represents the rated capacity of the storage battery units, and eta represents the discharge coefficient of the storage battery units.
Specifically, after obtaining the dc bus current I, the control device may obtain, according to a formula:
M＝K×I×T/(B×K×η)
and calculating the number M of the storage battery units meeting the load power supply requirement, wherein K represents the safety coefficient of the storage battery units, T represents the backup time of the distributed direct-current power supply system, B represents the rated capacity of the storage battery units, and eta represents the discharge coefficient of the storage battery units. K and η are set according to practical experience, and the embodiment of the disclosure is not limited.
If the current time is judged and known to be in the low electricity price time period, the load is powered through each conversion power supply unit, and meanwhile each storage battery unit is charged; wherein the low electricity price period is preset; specifically, the control means compares the current time with a start time and an end time of a low power rate period, respectively, and if the current time is between the start time and the end time of the low power rate period, the current time is in the low power rate period. The control device controls the conversion power supply units to supply power to the load, and controls the conversion power supply units with the matched number of the storage battery units to charge the storage battery units so as to realize energy storage of the storage battery units when the electricity price is low. Wherein the low electricity price period is preset. It will be appreciated that charging is no longer performed for a fully charged battery cell.
If the current time is judged and known to be in the high electricity price time period, the load is powered through the storage battery unit under the condition that the backup time requirement of the distributed direct current power supply system is met; wherein the high electricity rate period is preset.
Specifically, the control means compares the current time with a start time and an end time of the high-electricity rate period, respectively, and if the current time is between the start time and the end time of the high-electricity rate period, the current time is in the high-electricity rate period. The control device can reserve a certain number of storage battery units to meet the backup time requirement of the distributed direct current power supply system, control each power supply conversion module to reduce output voltage, and supply power to the load through the rest storage battery units, so that the power consumption cost is saved. Wherein the high electricity rate period is preset.
On the basis of the foregoing embodiments, further, the obtaining, according to the dc bus current and the rated capacity of the switching power supply units in the distributed dc power supply system, the number of switching power supply units that meet the power supply demand of the load includes:
and calculating the number N of the conversion power supply units meeting the power supply requirement of the load according to a formula N = I/(A multiplied by Y), wherein I represents the direct current bus current, A represents the rated capacity of the conversion power supply units, and Y represents the optimal efficiency point control load rate of the conversion power supply units.
Specifically, the control device may obtain the dc bus current I according to a formula
N＝I/(A×Y)
And calculating the number N of the conversion power supply units meeting the power supply requirement of the load, wherein A represents the rated capacity of the conversion power supply units, Y represents the optimal efficiency point control load rate of the conversion power supply units, and A and Y are preset.
On the basis of the foregoing embodiments, further, the method for controlling a distributed dc power supply system according to the embodiments of the present disclosure further includes: and when the redundancy configuration number of the conversion power supply unit corresponding to the load changes, adjusting the conversion power supply unit corresponding to the load according to the changed redundancy configuration number.
Specifically, the control device may obtain the redundant configuration number of the switching power supply unit corresponding to the load by querying according to the identifier of the load. When the number of redundant configurations of the switching power supply units corresponding to the load changes, the control device may adjust the switching power supply units corresponding to the load according to the changed number of redundant configurations, that is, when the number of redundant configurations increases, the control device increases the corresponding number of switching power supply units configured to the load, and when the number of redundant configurations decreases, the control device decreases the corresponding number of switching power supply units configured to the load.
For example, the number of redundant configuration of the switching power supply unit corresponding to the load a is changed from 1 to 5, and then the switching power supply unit configured to the load a by the control unit is increased by 4 on the original basis.
On the basis of the foregoing embodiments, further, the adjusting the switching power supply unit corresponding to the load according to the changed redundancy configuration number includes:
and when the changed redundancy configuration quantity is increased and the cabinet where the load is located has no idle conversion power supply unit, configuring the idle conversion power supply unit arranged on the other cabinet to the load.
Specifically, when the number of redundant configurations of the switching power supply units corresponding to the load is increased, and the cabinet where the load is located does not have enough idle switching power supply units configured for the load, the control device may call the idle switching power supply units from another cabinet and configure the idle switching power supply units to the load, so as to satisfy the redundant configuration of the switching power supply units corresponding to the load.
For example, the redundant configuration number of the switching power supply units corresponding to the load a is changed from 1 to 5, and then 4 switching power supply units configured to the load a by the control unit need to be added on the original basis, but the cabinet a in which the load a is located has only 1 idle switching power supply unit, and 3 switching power supply units are still lacked. And the control unit learns that the cabinet b has 3 idle switching power supply units, and the control unit can configure 1 idle switching power supply unit on the cabinet a and 3 idle switching power supply units on the cabinet b to the load A as the redundant configuration of the switching power supply unit of the load A.
The control device of the distributed dc power supply system provided by the embodiment of the present disclosure includes an obtaining unit, and an adjusting unit, wherein:
the acquisition unit is used for acquiring the direct current bus current of the distributed direct current power supply system; the obtaining unit is used for obtaining the number of the conversion power supply units meeting the load power supply requirement according to the direct current bus current and the rated capacity of the conversion power supply units in the distributed direct current power supply system; the adjusting unit is used for adjusting the switching power supply units which are started in the distributed direct current power supply system according to the number of the switching power supply units.
Specifically, when the external power supply is normally powered, and the distributed dc power supply system is started to supply power to the load, all the switching power supply units are turned on, and the obtaining unit can obtain the dc bus current through the current transformer installed on the dc bus. After obtaining the dc bus current, the obtaining unit may obtain, according to the dc bus current and a rated capacity of the switching power supply unit, a number of switching power supply units that need to be turned on under a condition that the load power supply requirement is satisfied. Wherein a rated capacity of the switching power supply unit and a rated capacity of the switching power supply unit are preset.
After obtaining the number of the switching power supply units meeting the load power supply requirement, the adjusting unit 503 compares the number Q1 of the switching power supply units meeting the load power supply requirement with the number Q2 of the switching power supply units already turned on, turns off the switching power supply units of the number obtained by subtracting Q1 from Q2, and operates the remaining Q1 switching power supply units.
The switched-off switching power supply unit is set according to practical experience, and the embodiment of the present disclosure is not limited.
According to the control device of the distributed direct-current power supply system, the direct-current bus current of the distributed direct-current power supply system can be obtained, the number of the conversion power supply units meeting the load power supply requirement is obtained according to the direct-current bus current and the rated capacity of the conversion power supply units in the distributed direct-current power supply system, and then the conversion power supply units started in the distributed direct-current power supply system are adjusted according to the number of the conversion power supply units, so that the cost of the uninterrupted power supply system is saved.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. A distributed photovoltaic power generation direct current power supply system is characterized by comprising: the photovoltaic power generation system comprises a distributed power generation system, a direct current voltage stabilizing system and an energy storage system, wherein the output end of the distributed photovoltaic power generation system is connected to the input end of the direct current voltage stabilizing system, and the second output end of the direct current voltage stabilizing system is electrically connected with the energy storage system;
the distributed power generation system includes:
the acquisition unit is used for acquiring the direct current bus current of the distributed direct current power supply system;
the obtaining unit is used for obtaining the number of the conversion power supply units meeting the load power supply requirement according to the direct current bus current and the rated capacity of the conversion power supply units in the distributed direct current power supply system;
and the adjusting unit is used for adjusting the switching power supply units which are started in the distributed direct current power supply system according to the number of the switching power supply units.
2. The distributed photovoltaic power generation direct-current power supply system of claim 1, wherein the energy storage system comprises a charging and discharging device and a storage battery.
3. The distributed photovoltaic power generation direct-current power supply system according to claim 2, wherein an input end of the charging and discharging device is electrically connected with a second output end of the direct-current voltage stabilizing system, and an output end of the charging and discharging device is electrically connected with the storage battery.
4. The distributed photovoltaic power generating dc power supply system of claim 1, wherein the dc power source comprises a plurality of voltage levels.
5. A working method of a distributed photovoltaic power generation direct current power supply system is characterized by comprising the following steps:
acquiring direct current bus current of a distributed direct current power supply system; obtaining the number of conversion power supply units meeting the power supply requirement of a load according to the direct current bus current and the rated capacity of the conversion power supply units in the distributed direct current power supply system;
and adjusting the switched power supply units which are started in the distributed direct current power supply system according to the number of the switched power supply units.
6. The operating method of the distributed photovoltaic power generation direct-current power supply system according to claim 5, wherein the number of the storage battery units meeting the power supply requirement of the load is obtained according to the direct-current bus current, the backup time of the distributed direct-current power supply system and the rated capacity of the storage battery units in the distributed direct-current power supply system; wherein the backup time is preset;
and setting backup storage battery units in the distributed direct current power supply system according to the number of the storage battery units.
7. The method according to claim 6, wherein the obtaining the number of battery units meeting the power supply requirement of the load according to the dc bus current, the backup time of the distributed dc power supply system, and the rated capacity of the battery units in the distributed dc power supply system comprises:
and calculating the number M of the storage battery units meeting the load power supply requirement according to a formula M = K multiplied by I multiplied by T/(B multiplied by K multiplied by eta), wherein K represents the safety coefficient of the storage battery units, I represents the direct current bus current, T represents the backup time of the distributed direct current power supply system, B represents the rated capacity of the storage battery units, and eta represents the discharge coefficient of the storage battery units.
8. The operating method of the distributed photovoltaic power generation direct-current power supply system according to claim 5, wherein if it is determined that the current time is in a low-electricity-price period, the load is supplied with power through each of the switching power supply units while each of the storage battery units is charged, wherein the low-electricity-price period is preset;
and if the current time is judged and known to be in a high electricity price time period, supplying power to the load through the storage battery unit under the condition of meeting the backup time requirement of the distributed direct current power supply system, wherein the high electricity price time period is preset.
9. The operating method of the distributed dc power supply system with photovoltaic power generation according to claim 5, wherein the obtaining the number of the switching power supply units meeting the power supply requirement of the load according to the dc bus current and the rated capacity of the switching power supply units in the distributed dc power supply system comprises:
and calculating the number N of the conversion power supply units meeting the power supply requirement of the load according to a formula N = I/(A multiplied by Y), wherein I represents the direct current bus current, A represents the rated capacity of the conversion power supply units, and Y represents the optimal efficiency point control load rate of the conversion power supply units.
10. The operating method of the distributed photovoltaic power generation dc power supply system according to claims 5 to 9, wherein when the number of redundant configurations of the switching power supply unit corresponding to the load changes, the switching power supply unit corresponding to the load is adjusted according to the changed number of redundant configurations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210726684.8A CN115173393A (en) | 2022-06-24 | 2022-06-24 | Distributed photovoltaic power generation direct-current power supply system and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210726684.8A CN115173393A (en) | 2022-06-24 | 2022-06-24 | Distributed photovoltaic power generation direct-current power supply system and working method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115173393A true CN115173393A (en) | 2022-10-11 |
Family
ID=83486457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210726684.8A Pending CN115173393A (en) | 2022-06-24 | 2022-06-24 | Distributed photovoltaic power generation direct-current power supply system and working method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115173393A (en) |
-
2022
- 2022-06-24 CN CN202210726684.8A patent/CN115173393A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102005817B (en) | Uninterruptible power supply device based on microgrid and dispatching control method thereof | |
| KR102400502B1 (en) | Energy storage system | |
| US20140361624A1 (en) | Apparatus and methods for control of load power quality in uninterruptible power systems | |
| JP5330941B2 (en) | Equipment control system | |
| US8253271B2 (en) | Home power supply system | |
| CN101826741A (en) | Novel efficient solar cell charging system and control method | |
| CN103066677A (en) | Self-adaptive hybrid power supply system | |
| KR101818168B1 (en) | Battery management device and battery energy storing system | |
| CN105811458A (en) | Microgrid energy storage system and energy management method thereof | |
| KR20180090673A (en) | Hybrid energy storage system | |
| JP2002218654A (en) | Photovoltaic power generation system | |
| CN114844030A (en) | Direct-current micro-grid bus management method and energy supply system | |
| KR102092088B1 (en) | Apparatus and method for energy storage system controlling operating mode | |
| CN108879745B (en) | Comprehensive power generation system and method for improving unit peak regulation economy | |
| KR102222560B1 (en) | An energy storage system | |
| KR101215396B1 (en) | Hybrid smart grid uninterruptible power supply using discharge current control | |
| KR20200079606A (en) | Control system of DC Uninterruptible Power Supply for load distribution | |
| Ramprabu et al. | Energy Management System based on Interleaved Landsman Converter using Hybrid Energy Sources | |
| CN115173393A (en) | Distributed photovoltaic power generation direct-current power supply system and working method thereof | |
| KR101216703B1 (en) | Eco-friendly electric vehicle charging system | |
| Cavallaro et al. | Smart photovoltaic UPS system for domestic appliances | |
| CN112865106A (en) | AC/DC hybrid micro-grid power scheduling method considering charge state | |
| Yan et al. | Energy Management of Household Microgrid with Multiple Energy Resources for Rural Area | |
| JP2016174477A (en) | Input control power storage system | |
| US20160141916A1 (en) | Power system, power management method, and program |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |