CN116094064A - Power supply system, control method, device, equipment and storage medium - Google Patents

Power supply system, control method, device, equipment and storage medium Download PDF

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Publication number
CN116094064A
CN116094064A CN202211714986.XA CN202211714986A CN116094064A CN 116094064 A CN116094064 A CN 116094064A CN 202211714986 A CN202211714986 A CN 202211714986A CN 116094064 A CN116094064 A CN 116094064A
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China
Prior art keywords
power generation
power
power supply
supply system
control
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Pending
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CN202211714986.XA
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Chinese (zh)
Inventor
迟永宁
李晓雪
李琰
方能炜
李云鹏
醒月
李�根
曹丽霄
石伟
陈冀华
姜冠宁
辛亚
范译文
王聪
戚洪昌
樊肖杰
肖宇
李翔宇
姜炳蔚
李辰佳
徐琰润
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Beijing Aerospace Data Co ltd
Beijing Aerospace Intelligent Technology Development Co ltd
Yuxi Branch Of Aerospace Cloud Network Technology Development Co ltd
China Electric Power Research Institute Co Ltd CEPRI
Original Assignee
Beijing Aerospace Data Co ltd
Beijing Aerospace Intelligent Technology Development Co ltd
Yuxi Branch Of Aerospace Cloud Network Technology Development Co ltd
China Electric Power Research Institute Co Ltd CEPRI
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Priority to CN202211714986.XA priority Critical patent/CN116094064A/en
Publication of CN116094064A publication Critical patent/CN116094064A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66—Regulating electric power
    • G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
    • 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
    • H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
    • 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
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • 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

Abstract

The application provides a power supply system, a control method, a control device, equipment and a storage medium, and relates to the technical field of electric power. The method comprises the steps of obtaining the load voltage of a power supply system; determining the load power of the power supply system according to the load voltage and the load resistance of the power supply system; according to the load power of the power supply system, determining a power generation control mode of a plurality of power generation modules in the power supply system, wherein the power generation control mode of each power generation module is as follows: MPPT mode or constant voltage mode; and respectively controlling the plurality of power generation modules to generate power according to the power generation control modes of the plurality of power generation modules. Therefore, the power supply system can be suitable for power supply conditions of different loads, the power supply control efficiency is improved, the power supply is more stable, energy storage equipment is not needed by the power supply system, and the power supply control cost is reduced.

Description

Power supply system, control method, device, equipment and storage medium
Technical Field
The present invention relates to the field of power technologies, and in particular, to a power supply system, a control method, a device, equipment, and a storage medium.
Background
To maximize the utilization of photovoltaic resources, photovoltaic power generation systems are typically targeted to provide maximum electrical energy, and therefore, they mainly employ maximum power tracking (Maximum Power Point Tracking, MPPT) control strategies. However, the randomness and fluctuation of the photovoltaic power generation power presents challenges for the steady operation of the medium voltage direct current system.
The medium voltage direct current system with high proportion of distributed photovoltaic can be operated in a grid-connected mode or an off-grid mode. In grid-connected mode, a constant voltage can be provided by the AC/DC converter to the DC system. In this case, the photovoltaic operates under the MPPT control strategy to output electrical energy at maximum power, which can be compared to a constant current source without regulation capability. In off-grid mode, scholars propose an integrated operation mode of photovoltaic and energy storage systems. According to research, in order to cooperate with the photovoltaic power generation system based on the MPPT control strategy to operate, the energy storage system needs to respond to the power change of the load through charge and discharge according to the fluctuation of photovoltaic power generation power, so that the stable operation of the direct current system is realized. Therefore, when the direct current bus voltage is constant without depending on other equipment, the photovoltaic power generation system is difficult to independently operate under the MPPT control strategy because the photovoltaic power generation system does not have the capability of supporting the direct current bus voltage. In particular in off-grid mode, the dc bus voltage must be controlled to be constant by other devices, so that the control costs increase.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a power supply system, a control method, a control device, equipment and a storage medium, so as to solve the problems of unstable power supply, high control cost and the like of the power supply system in the prior art.
In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:
in a first aspect, embodiments of the present application provide a power supply system, the system including: a plurality of power generation modules, a first capacitor and a control module;
the power generation modules are connected in parallel at two ends of the first capacitor; the control module is connected with the control end of each power generation module, and the voltage detection end of the control module is connected with the two ends of the first capacitor.
Optionally, the power generation module includes: the system comprises a maximum power tracking (MPPT) controller, a constant voltage controller, a power generation unit, a direct current conversion unit, a pulser and a switch unit;
the power generation unit is connected in parallel with two ends of the first capacitor through the direct current conversion unit;
the voltage detection end of the MPPT controller is connected to two ends of the power generation unit, the current detection end of the MPPT controller is connected to the positive electrode of the power generation unit, and the output end of the MPPT controller is connected to the first end of the switch unit;
the voltage detection end of the constant voltage controller is connected to two ends of the first capacitor, and the output end of the constant voltage controller is connected to the second end of the switch unit;
the third end of the switch unit is connected with the control end of the direct current conversion unit through the pulser, and the control end of the switch unit is as follows: and a control end of the power generation module.
In a second aspect, an embodiment of the present application provides a power supply control method, applying a control module in any one of the power supply systems of the first aspect, where the method includes:
acquiring the load voltage of a power supply system;
determining the load power of the power supply system according to the load voltage and the load resistance of the power supply system;
according to the load power of the power supply system, determining a power generation control mode of a plurality of power generation modules in the power supply system, wherein the power generation control mode of each power generation module is as follows: MPPT mode or constant voltage mode;
and respectively controlling the plurality of power generation modules to generate power according to the power generation control modes of the plurality of power generation modules.
Optionally, the determining a power generation control mode of a plurality of power generation modules in the power supply system according to the load power of the power supply system includes:
according to the load power of the power supply system, determining a target interval in which the load power is located from a plurality of preset power intervals;
determining a control mode corresponding to the target interval by adopting a mapping table of a preset power interval and the control mode; the control mode includes: mode indication information of the plurality of power generation modules;
and determining the power generation control modes of the plurality of power generation modules by adopting mode indication information of the plurality of power generation modules in the control modes.
Optionally, before the target interval in which the load power is located is determined from a plurality of preset power intervals according to the load power of the power supply system, the method further includes:
and determining a plurality of preset power intervals according to the power generation power characteristics of the power generation modules.
Optionally, the power generation module is a photovoltaic power generation module, and determining a plurality of preset power intervals according to the power generation characteristics of a plurality of power generation modules includes:
sequencing the power generation modules according to the illumination intensity of the areas corresponding to the power generation modules;
determining a power generation characteristic curve chart of the sequenced power generation modules;
and determining a plurality of preset power intervals according to a plurality of power values in the power generation characteristic curve chart.
Optionally, the determining the power generation control mode of the plurality of power generation modules in the power supply system according to the load power of the power supply system further includes:
and if the load power of the power supply system is not in the preset power intervals, determining that the current power generation control modes of the power generation modules are respectively power generation control modes of the power generation modules.
In a third aspect, an embodiment of the present application provides a power supply control device, applying a control module in the power supply system according to any one of the first aspect, where the device includes:
the acquisition module is used for acquiring the load voltage of the power supply system;
the first determining module is used for determining the load power of the power supply system according to the load voltage and the load resistance of the power supply system;
the second determining module is configured to determine a power generation control mode of a plurality of power generation modules in the power supply system according to the load power of the power supply system, where the power generation control mode of each power generation module is: MPPT mode or constant voltage mode;
and the control module is used for respectively controlling the plurality of power generation modules to generate power according to the power generation control modes of the plurality of power generation modules.
In a fourth aspect, an embodiment of the present application provides a control apparatus, including: the power supply control method according to the second aspect comprises a processor and a storage medium, wherein the processor is in communication connection with the storage medium through a bus, the storage medium stores program instructions executable by the processor, and the processor calls a program stored in the storage medium to execute the steps of the power supply control method according to the second aspect.
In a fifth aspect, embodiments of the present application provide a storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the power supply control method according to any one of the second aspects.
Compared with the prior art, the application has the following beneficial effects:
the application provides a power supply system, a control method, a device, equipment and a storage medium, wherein the method comprises the steps of obtaining the load voltage of the power supply system; determining the load power of the power supply system according to the load voltage and the load resistance of the power supply system; according to the load power of the power supply system, determining a power generation control mode of a plurality of power generation modules in the power supply system, wherein the power generation control mode of each power generation module is as follows: MPPT mode or constant voltage mode; and respectively controlling the plurality of power generation modules to generate power according to the power generation control modes of the plurality of power generation modules. Therefore, the power supply system can be suitable for power supply conditions of different loads, the power supply control efficiency is improved, the power supply is more stable, energy storage equipment is not needed by the power supply system, and the power supply control cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a power supply system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power generation module according to an embodiment of the present application;
fig. 3 is a schematic control principle diagram of a constant voltage controller according to an embodiment of the present application;
fig. 4 is a schematic flow chart of a power supply control method according to an embodiment of the present application;
FIG. 5 is a flow chart of a method for determining a power generation control mode of a plurality of power generation modules according to an embodiment of the present application;
fig. 6 is a schematic flow chart of determining a plurality of preset power intervals according to an embodiment of the present application;
FIG. 7 is a graph of power generation characteristics of three power generation modules provided in an embodiment of the present application;
fig. 8 is a schematic diagram of a power supply control device according to an embodiment of the present application;
fig. 9 is a schematic diagram of a control device according to an embodiment of the present application.
Icon: 100-power generation module, 200-first capacitor, 300-control module, 101-MPPT controller, 102-constant voltage controller, 103-power generation unit, 104-direct current conversion unit, 105-pulser, 106-switch unit, 801-acquisition module, 802-first determination module, 803-second determination module, 804-power generation control module, 901-processor, 902-storage medium.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
In order to reduce the power supply control cost and improve the power supply control efficiency, the application provides a power supply system, a control method, a device, equipment and a storage medium.
A power supply system provided in the embodiments of the present application is explained below by a specific example. Fig. 1 is a schematic structural diagram of a power supply system according to an embodiment of the present application. As shown in fig. 1, the system includes: a plurality of power generation modules 100, a first capacitor 200, and a control module 300.
The plurality of power generation modules 100 are connected in parallel to both ends of the first capacitor 200; the control module 300 is connected to the control end of each power generation module 100, and the voltage detection end of the control module 300 is connected to two ends of the first capacitor 200.
Through setting up a plurality of power generation module 100 and supplying power for the load, form many distributed generation system, improved the flexibility of supplying power, a plurality of power generation module 100 cooperate for the power supply is more stable. The first capacitor 200 is an equivalent capacitor of the multi-distributed power generation system. By arranging the control module 300 and further controlling the power generation modules 100 to supply power according to the load voltage detected by the voltage detection end of the control module 300, the power supply system can be suitable for power supply conditions of different loads, and power supply control efficiency is improved. In addition, the power supply system does not need energy storage equipment, and reduces the power supply control cost.
By way of example, the control module 300 may be a device having computing processing functionality.
To sum up, in this embodiment, the system includes: a plurality of power generation modules, a first capacitor and a control module; the power generation modules are connected in parallel at two ends of the first capacitor; the control module is connected with the control end of each power generation module, and the voltage detection end of the control module is connected with the two ends of the first capacitor. Therefore, the power supply system can be suitable for power supply conditions of different loads, the power supply control efficiency is improved, the power supply is more stable, energy storage equipment is not needed by the power supply system, and the power supply control cost is reduced.
On the basis of the embodiment corresponding to fig. 1, the application also provides a power generation module. Fig. 2 is a schematic structural diagram of a power generation module according to an embodiment of the present application. As shown in fig. 2, the power generation module includes: MPPT controller 101, constant voltage controller 102, power generation unit 103, dc conversion unit 104, pulser 105, and switching unit 106.
The power generation unit 103 is connected in parallel to two ends of the first capacitor 200 through the dc conversion unit 104.
The voltage detection end of the MPPT controller 101 is connected to two ends of the power generation unit 103, the current detection end of the MPPT controller 101 is connected to the positive electrode of the power generation unit 103, and the output end of the MPPT controller 101 is connected to the first end of the switch unit 106. The MPPT controller 101 may detect the voltage at both ends of the power generation unit 103 through the voltage detection terminal, and the MPPT controller 101 may detect the output current of the power generation unit 103 through the current detection terminal. The MPPT controller 101 can detect the voltage and current of the power generation unit 103 in real time, and track the highest voltage and current value, so that the power generation module 100 always outputs at the maximum power.
The voltage detection terminals of the constant voltage controller 102 are connected to two ends of the first capacitor 200, and the output terminal of the constant voltage controller 102 is connected to the second end of the switch unit 106. The constant voltage controller 102 can detect the voltage of the load through the voltage detection terminal. The constant voltage controller 102 may detect the voltage of the load in real time and make the output power of the power generation module 100 always equal to the load power.
The third terminal of the switch unit 106 is connected to the control terminal of the dc conversion unit 104 through the pulser 105, and the control terminal of the switch unit 106 is: the control end of the power generation module 100. For example, the dc conversion unit 104 may be a Boost-LLC converter, where the LLC high-frequency converter only plays a role in boosting and energy transfer in the power generation module 100, so that only the Boost circuit Guan Duanjiao β needs to be adjusted to achieve the purpose of adjusting the output port voltage of the power generation module 100.
When the control module 300 controls the switching unit 106 to connect the 0 terminal, the MPPT control strategy is performed, and the entire power generation module 100 outputs at the maximum power. When the control module 300 controls the switch unit 106 to be connected with the 1 end, a constant voltage control strategy is executed, and the output voltage of the power generation module 100 is regulated through the direct current conversion unit according to the fluctuation of the load, so that the output power of the power generation module 100 is always equal to the load power, and the voltage stability of the direct current bus is realized. That is, the power generation module 100 can only provide one of the MPPT control strategy and the constant voltage control strategy, so that the voltage regulation capability of the power generation module 100 is more flexible and flexible, and the power supply efficiency is improved.
Fig. 3 is a schematic diagram illustrating a control principle of a constant voltage controller according to an embodiment of the present application. As shown in FIG. 3, in the figure
Figure BDA0004027564860000081
And->
Figure BDA0004027564860000082
Voltage reference values, U, of the dc bus and the power generation unit 103, respectively DC For the dc bus voltage detected by the constant voltage controller 102, Δu DC Is->
Figure BDA0004027564860000083
And U DC Is a difference in (c). I DC Is the current of a direct current bus, delta P DC For varying the power caused by load fluctuation, k PV For the slope of the monotonically increasing interval of the P-U curve of the power generation module 100 at different environmental conditions, ΔU PV The variation of the port voltage of the power generation module 100 corresponding to the monotonically increasing interval of the P-U curve of the power generation module 100 caused by the load variation. Voltage variation and I of DC bus after passing through PI controller DC To obtain delta P DC ，ΔP DC And k is equal to PV To obtain DeltaU PV ，ΔU PV And->
Figure BDA0004027564860000084
The control amount of the constant voltage controller 102 is obtained.
By way of example, based on fig. 1-3, the power dynamic balance relationship inside the power supply system is shown in the following formula (1):
Figure BDA0004027564860000085
the dynamic characteristic of the power supply system is basically the interactive influence of active power and direct current bus voltage, and the P-U relation is shown in the following formula (2):
Figure BDA0004027564860000086
wherein U is DC Is the voltage of a direct current bus; c (C) DC The equivalent capacitance of the DC bus; p (P) PV The total output power of the power supply system; p (P) load Is the load power.
When the load power is increased (e.g. new consumer is put in), or the original load power is increased, if the power supply system does not increase the power generation, P load (t+Δt)＞P PV (t) the dc bus voltage decreases. The power generation module 100 operating in the constant voltage control strategy may increase the output port voltage of the power generation module 100 and increase the power generation amount by adjusting the dc conversion unit 104. The power generation module 100 working in the MPPT control strategy has a fluctuation of the port voltage due to the fluctuation of the dc bus voltage, so that the power is reduced slightly and then increased to the maximum value. Final U DC And recovering the rated voltage, and realizing stable operation of the power supply system.
To sum up, in the present embodiment, the power generation module includes: the MPPT system comprises an MPPT controller, a constant voltage controller, a power generation unit, a direct current conversion unit, a pulser and a switch unit; the power generation unit is connected in parallel with two ends of the first capacitor through the direct current conversion unit; the voltage detection end of the MPPT controller is connected to two ends of the power generation unit, the current detection end of the MPPT controller is connected to the positive electrode of the power generation unit, and the output end of the MPPT controller is connected to the first end of the switch unit; the voltage detection end of the constant voltage controller is connected with the two ends of the first capacitor, and the output end of the constant voltage controller is connected with the second end of the switch unit; the third end of the switch unit is connected with the control end of the direct current conversion unit through a pulser, and the control end of the switch unit is as follows: and a control end of the power generation module. Therefore, the voltage regulating capability of the power generation module is more elastic and flexible, and the power supply efficiency is improved.
A power supply control method provided in the present application is explained by a specific example as follows. Fig. 4 is a schematic flow chart of a power supply control method according to an embodiment of the present application, and an execution body of the method may be a control module in any one of the power supply systems corresponding to fig. 1 or fig. 2, where the control module may be a device with a computing processing function. As shown in fig. 4, the method includes:
s101, acquiring the load voltage of a power supply system.
The load voltage of the power supply system can be obtained through the voltage detection terminal.
S102, determining the load power of the power supply system according to the load voltage and the load resistance of the power supply system.
According to the load voltage and the load resistance of the power supply system, the load power of the power supply system can be calculated.
S103, determining a power generation control mode of a plurality of power generation modules in the power supply system according to the load power of the power supply system.
The power generation control mode of each power generation module is as follows: MPPT mode or constant voltage mode.
The power generation control mode of the plurality of power generation modules in the power supply system can be determined based on the load power of the power supply system. So that the power generation control modes of the plurality of power generation modules satisfy the load power of the power supply system.
Taking three power generation modules as an example, determining the power generation control modes of the plurality of power generation modules in the power supply system according to the load power of the power supply system may be: the power generation control mode of the first power generation module is MPPT mode, the power generation control mode of the second power generation module is constant voltage mode, and the power generation control mode of the second power generation module is constant voltage mode.
And S104, respectively controlling the plurality of power generation modules to generate power according to the power generation control modes of the plurality of power generation modules.
The power generation control mode of the plurality of power generation modules after the determination satisfies the current load power of the power supply system. And respectively controlling the plurality of power generation modules to generate power according to the power generation control modes of the plurality of power generation modules. The power supply system can be suitable for power supply conditions of different loads, improves power supply control efficiency, enables power supply to be more stable, does not need energy storage equipment, and reduces power supply control cost.
To sum up, in the present embodiment, the load voltage of the power supply system is obtained; determining the load power of the power supply system according to the load voltage and the load resistance of the power supply system; according to the load power of the power supply system, determining a power generation control mode of a plurality of power generation modules in the power supply system, wherein the power generation control mode of each power generation module is as follows: MPPT mode or constant voltage mode; and respectively controlling the plurality of power generation modules to generate power according to the power generation control modes of the plurality of power generation modules. Therefore, the power supply system can be suitable for power supply conditions of different loads, the power supply control efficiency is improved, the power supply is more stable, energy storage equipment is not needed by the power supply system, and the power supply control cost is reduced.
On the basis of the embodiment corresponding to fig. 4, the embodiment of the application also provides a method for determining the power generation control modes of the plurality of power generation modules. Fig. 5 is a flowchart of a method for determining a power generation control mode of a plurality of power generation modules according to an embodiment of the present application. As shown in fig. 5, determining a power generation control mode of a plurality of power generation modules in the power supply system according to a load power of the power supply system in S103 includes:
s201, determining a target section where the load power is located from a plurality of preset power sections according to the load power of the power supply system.
S202, determining a control mode corresponding to the target interval by adopting a mapping table of a preset power interval and the control mode.
The control mode includes: mode indication information of the plurality of power generation modules. The mode indication information is a control mode indicating the current power generation module.
The mapping table of the preset power intervals and the control modes characterizes the control mode corresponding to each preset power interval, so that the control mode corresponding to the target interval can be determined. To meet the power supply requirements of different load powers.
S203, determining a power generation control mode of the plurality of power generation modules by using mode indication information of the plurality of power generation modules in the control mode.
The mode indication information indicates the control mode of the current power generation module, and then the power generation control modes of the plurality of power generation modules are determined by adopting the mode indication information of the plurality of power generation modules in the control mode.
To sum up, in the embodiment, according to the load power of the power supply system, a target interval in which the load power is located is determined from a plurality of preset power intervals; determining a control mode corresponding to the target interval by adopting a mapping table of a preset power interval and the control mode; the control mode includes: mode indication information of a plurality of power generation modules; and determining the power generation control mode of the plurality of power generation modules by using the mode indication information of the plurality of power generation modules in the control mode. Therefore, the power generation control modes of the power generation modules are determined according to the load power, and the power supply requirements of different load powers are met.
On the basis of the embodiment corresponding to fig. 5, in S201, before determining, according to the load power of the power supply system, the target interval in which the load power is located from a plurality of preset power intervals, the method further includes:
and determining a plurality of preset power intervals according to the power generation power characteristics of the power generation modules.
And setting a plurality of preset power intervals for accurately partitioning, and analyzing the power generation characteristics of the power generation modules. And determining a plurality of preset power intervals according to the power generation power characteristics of the power generation modules. Each preset power interval accurately characterizes different power generation characteristics of the power generation modules.
To sum up, in the present embodiment, a plurality of preset power intervals are determined according to the generated power characteristics of a plurality of power generation modules. Thus, a plurality of preset power intervals are precisely obtained.
On the basis of the embodiment, the embodiment of the application also provides a method for determining a plurality of preset power intervals. Fig. 6 is a flowchart illustrating a process of determining a plurality of preset power intervals according to an embodiment of the present application. As shown in fig. 6, if the power generation module is a photovoltaic power generation module, determining a plurality of preset power intervals according to the power generation characteristics of the plurality of power generation modules includes:
s301, sequencing the plurality of power generation modules according to the illumination intensity of the areas corresponding to the plurality of power generation modules.
For example, when a plurality of power generation modules run at different illumination intensities, for reasonable dynamic characteristics of the photovoltaic power generation modules, disordered actions of the plurality of photovoltaic power generation modules are prevented, and a sequential cooperative control strategy is provided. Under the cooperative strategy, the plurality of power generation modules are ordered in the order from the high-illumination-intensity photovoltaic power generation module to the low-illumination-intensity photovoltaic power generation module.
S302, determining a power generation characteristic curve chart of the sequenced power generation modules.
Illustratively, three photovoltaic power generation modules are illustrated. Fig. 7 is a graph of power generation characteristics of three power generation modules according to an embodiment of the present application, wherein the horizontal axis in fig. 7 is voltage and the vertical axis is power.
Taking three photovoltaic power generation modules of PV1, PV2 and PV3 as an example, wherein the illumination intensity of PV1 > the illumination intensity of PV2 > the illumination intensity of PV 3. As shown in fig. 7, the power generation characteristic curve where P1 is located is a power generation characteristic curve when three photovoltaic power generation modules are simultaneously operated, and P1 is a power value corresponding to the maximum output point of the power generation characteristic curve. The power generation characteristic curve where P2 is located is the power generation characteristic curve when the two photovoltaic power generation modules PV2 and PV3 operate simultaneously, and P2 is the power value corresponding to the maximum output point of the power generation characteristic curve. The power generation characteristic curve where P3 is located is the power generation characteristic curve when the PV3 photovoltaic power generation module operates, and P3 is the power value corresponding to the maximum output point of the power generation characteristic curve. That is, the power generation characteristic curves of the ordered power generation modules are determined.
The broken line in fig. 7 is a dynamic operation curve of the load, and the first half of the dynamic operation curve coincides with the power generation characteristic curve in which P1 is located.
S303, determining a plurality of preset power intervals according to a plurality of power values in the power generation characteristic curve chart.
By way of example, with continued reference to fig. 7, three photovoltaic power generation modules are illustrated. The method comprises the steps of determining a plurality of preset power intervals to be respectively: (P2, P1], (P3, P2], [ P4, P3].
Wherein P4 is the minimum output power of the power supply system.
To sum up, in the present embodiment, the plurality of power generation modules are ordered according to the illumination intensities of the areas corresponding to the plurality of power generation modules; determining a power generation characteristic curve graph of the sequenced power generation modules; and determining a plurality of preset power intervals according to the power values in the power generation characteristic curve chart. Thus, a plurality of preset power intervals are precisely determined.
Further, taking three photovoltaic power generation modules as an example, the power generation control modes corresponding to the power intervals (P1, P2) are a constant voltage mode, an MPPT mode and an MPPT mode of PV1, PV2 and PV 3.
The power generation control mode corresponding to the power section (P2, P3) is that the PV1 mode is a constant voltage mode, the PV2 mode is a constant voltage mode, and the PV3 mode is an MPPT mode.
The power generation control mode corresponding to the power section (P3, P4) is a constant voltage mode of PV1, a constant voltage mode of PV2, and a constant voltage mode of PV 3.
The above embodiments are described by taking three photovoltaic power generation modules as an example, and if the power supply system includes a plurality of photovoltaic power generation modules, the control manner of the three photovoltaic power generation modules is similar.
On the basis of the embodiment corresponding to fig. 5, in S103, the determining a power generation control mode of a plurality of power generation modules in the power supply system according to the load power of the power supply system further includes:
and if the load power of the power supply system is not in a plurality of preset power intervals, determining that the current power generation control modes of the plurality of power generation modules are respectively power generation control modes of the plurality of power generation modules.
For example, if the load power of the power supply system is not within a plurality of preset power intervals, the load resistance may be greater than 202/PPVmax, which may result in that the dc bus voltage is less than 20kV, the output power of the power supply system is reduced, the power cannot be output at the maximum power, and the dc bus voltage cannot be maintained stable. Similarly, if the load power is smaller than P4, that is, the power required by the load is smaller than the minimum value provided by the power supply system, the dc bus voltage will rise, so that the system cannot operate normally.
In this case, by controlling the power generation control modes of the plurality of power generation modules and failing to stabilize the dc bus voltage, it is necessary to take other preset methods to consume excessive electric power to stabilize the dc bus voltage. Therefore, the current power generation control modes of the plurality of power generation modules are determined to be the power generation control modes of the plurality of power generation modules respectively, and the current power generation control modes are kept unchanged.
In summary, in the present embodiment, if the load power of the power supply system is not within the plurality of preset power intervals, it is determined that the current power generation control modes of the plurality of power generation modules are the power generation control modes of the plurality of power generation modules, respectively. Therefore, when the load power is not in a plurality of preset power intervals, the stable direct current bus voltage is realized.
The following describes the power supply control device, the storage medium and the like provided in the present application for execution, and specific implementation processes and technical effects thereof are referred to above, which are not described in detail below.
Fig. 8 is a schematic diagram of a power supply control device according to an embodiment of the present application. As shown in fig. 8, the control module applied to the power supply system according to any of the above embodiments includes:
an acquisition module 801 is configured to acquire a load voltage of a power supply system.
The first determining module 802 is configured to determine a load power of the power supply system according to a load voltage and a load resistance of the power supply system.
A second determining module 803, configured to determine a power generation control mode of a plurality of power generation modules in the power supply system according to the load power of the power supply system, where the power generation control mode of each power generation module is: MPPT mode or constant voltage mode.
The power generation control module 804 is configured to control the plurality of power generation modules to generate power according to the power generation control modes of the plurality of power generation modules, respectively.
Further, the second determining module 803 is specifically configured to determine, according to the load power of the power supply system, a target interval in which the load power is located from a plurality of preset power intervals; determining a control mode corresponding to the target interval by adopting a mapping table of a preset power interval and the control mode; the control mode includes: mode indication information of a plurality of power generation modules; and determining the power generation control mode of the plurality of power generation modules by using the mode indication information of the plurality of power generation modules in the control mode.
Further, the second determining module 803 is specifically further configured to determine a plurality of preset power intervals according to the generated power characteristics of the plurality of power generating modules.
Further, the second determining module 803 is specifically further configured to sequence the plurality of power generation modules according to the illumination intensities of the areas corresponding to the plurality of power generation modules, where the power generation modules are photovoltaic power generation modules; determining a power generation characteristic curve graph of the sequenced power generation modules; and determining a plurality of preset power intervals according to the power values in the power generation characteristic curve chart.
Further, the second determining module 803 is specifically further configured to determine that the current power generation control modes of the plurality of power generation modules are the power generation control modes of the plurality of power generation modules, respectively, if the load power of the power supply system is not within the plurality of preset power intervals.
Fig. 9 is a schematic diagram of a control device provided in an embodiment of the present application, where the control device may be a device with a computing processing function.
The control device includes: processor 901, storage medium 902. The processor 901 and the storage medium 902 are connected by a bus.
The storage medium 902 is used to store a program, and the processor 901 calls the program stored in the storage medium 902 to execute the above-described method embodiment. The specific implementation manner and the technical effect are similar, and are not repeated here.
Optionally, the present invention further provides a storage medium comprising a program, which when executed by a processor is adapted to carry out the above-described method embodiments. In the several embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The integrated units implemented in the form of software functional units described above may be stored in a storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (english: processor) to perform some of the steps of the methods according to the embodiments of the invention. And the aforementioned storage medium includes: u disk, mobile hard disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

Claims (10)

1. A power supply system, the system comprising: a plurality of power generation modules, a first capacitor and a control module;
the power generation modules are connected in parallel at two ends of the first capacitor; the control module is connected with the control end of each power generation module 5, and the voltage detection end of the control module is connected with the two ends of the first capacitor.
2. The system of claim 1, wherein the power generation module comprises: the system comprises a maximum power tracking (MPPT) controller, a constant voltage controller, a power generation unit, a direct current conversion unit, a pulser and a switch unit;
the power generation unit is connected in parallel with two ends of the first capacitor through the direct current conversion unit;
the voltage detection end of the MPPT controller is connected to two ends of the power generation unit, the current detection end of the MPPT controller is connected to the positive electrode of the power generation unit, and the output end of the MPPT controller is connected to the first end of the switch unit;
the voltage detection end of the constant voltage controller is connected to two ends of the first capacitor, and the output end of the constant voltage 5 controller is connected to the second end of the switch unit;
the third end of the switch unit is connected with the control end of the direct current conversion unit through the pulser, and the control end of the switch unit is as follows: and a control end of the power generation module.
3. A power supply control method, characterized by applying the control module in the power supply system according to claim 1 or 2, the method comprising:
0, acquiring load voltage of a power supply system;
determining the load power of the power supply system according to the load voltage and the load resistance of the power supply system;
according to the load power of the power supply system, determining a power generation control mode of a plurality of power generation modules in the power supply system, wherein the power generation control mode of each power generation module is as follows: MPPT mode or constant voltage mode; and 5, respectively controlling the plurality of power generation modules to generate power according to the power generation control modes of the plurality of power generation modules.
4. A method according to claim 3, wherein said determining a power generation control mode of a plurality of power generation modules in the power supply system based on the load power of the power supply system comprises:
according to the load power of the power supply system, determining a target interval in which the load power is located from a plurality of preset power intervals;
determining a control mode corresponding to the target interval by adopting a mapping table of a preset power interval and the control mode; the control mode includes: mode indication information of the plurality of power generation modules;
and determining the power generation control modes of the plurality of power generation modules by adopting mode indication information of the plurality of power generation modules in the control modes.
5. The method according to claim 4, wherein before the target section in which the load power is located is determined from a plurality of preset power sections according to the load power of the power supply system, the method further comprises:
and determining a plurality of preset power intervals according to the power generation power characteristics of the power generation modules.
6. The method of claim 5, wherein the power generation module is a photovoltaic power generation module, and wherein determining the plurality of preset power intervals based on the generated power characteristics of the plurality of power generation modules comprises:
sequencing the power generation modules according to the illumination intensity of the areas corresponding to the power generation modules;
determining a power generation characteristic curve chart of the sequenced power generation modules;
and determining a plurality of preset power intervals according to a plurality of power values in the power generation characteristic curve chart.
7. The method of claim 4, wherein determining a power generation control mode of a plurality of power generation modules in the power supply system based on the load power of the power supply system further comprises:
and if the load power of the power supply system is not in the preset power intervals, determining that the current power generation control modes of the power generation modules are respectively power generation control modes of the power generation modules.
8. A power supply control device, characterized by applying a control module in the power supply system according to claim 1 or 2, the device comprising:
the acquisition module is used for acquiring the load voltage of the power supply system;
the first determining module is used for determining the load power of the power supply system according to the load voltage and the load resistance of the power supply system;
the second determining module is configured to determine a power generation control mode of a plurality of power generation modules in the power supply system according to the load power of the power supply system, where the power generation control mode of each power generation module is: MPPT mode or constant voltage mode;
and the control module is used for respectively controlling the plurality of power generation modules to generate power according to the power generation control modes of the plurality of power generation modules.
9. A control apparatus, characterized by comprising: the power supply control method according to any one of claims 3 to 7, wherein the processor is connected with the storage medium through bus communication, the storage medium stores program instructions executable by the processor, and the processor calls a program stored in the storage medium to execute the steps of the power supply control method.
10. A storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the power supply control method according to any one of claims 3 to 7.
CN202211714986.XA 2022-12-29 2022-12-29 Power supply system, control method, device, equipment and storage medium Pending CN116094064A (en)

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