CN115000986A - Energy management method and system for light storage power generation system supporting dual-mode operation - Google Patents
Energy management method and system for light storage power generation system supporting dual-mode operation Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
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Abstract
The embodiment of the invention provides an energy management method and system for an optical storage power generation system supporting dual-mode operation, wherein the energy storage system can selectively work in a local generation self-balancing mode and a feeder network photovoltaic power fluctuation stabilizing mode by judging the level of a local load in the optical storage power generation system, and under the local generation self-balancing mode, the energy storage system can compensate the difference power after the action of photovoltaic power generation and the local load based on the energy storage and transfer capacity of the energy storage system, so that the local load does not need to absorb energy from a power grid; under the mode of feed net photovoltaic power fluctuation stabilization, the energy storage system can stabilize high-frequency fluctuation components in photovoltaic output power and limit the climbing rate.
Description
Technical Field
The embodiment of the invention relates to the technical field of power generation system energy management, in particular to a method and a system for managing energy of a light storage power generation system supporting dual-mode operation.
Background
The development and utilization of renewable energy sources play a very key role in solving energy crisis and environmental problems. In view of the obvious advantages of easy acquisition, huge quantity, harmlessness and the like of solar energy, photovoltaic power generation becomes one of the main ways of renewable energy utilization.
Due to seasonal and climatic factors, photovoltaic power generation has obvious fluctuation and uncertainty, and impact can be caused to a power grid after the photovoltaic power generation is incorporated into the power grid along with the enlargement of the scale, so that the safe and stable operation of the power grid is influenced. The energy storage has the function of storing or releasing a certain amount of electric energy, can store partial electric energy when the photovoltaic is in a power generation peak and the electricity is in a valley period, and releases the electric energy in the power generation valley period and the electricity utilization peak period, thereby achieving the purpose of peak clipping and valley filling. Considering the expensive energy storage economic cost, a single peak clipping and valley filling operation mode cannot give full play to the energy storage value, and the finding of the multi-mode multiplexing of the energy storage system has good practical significance.
Disclosure of Invention
The embodiment of the invention provides an energy management method and system for a light storage power generation system supporting dual-mode operation, and aims to solve the problems that a single peak clipping and valley filling operation mode cannot give full play to energy storage value and cannot improve the utilization efficiency of energy storage and the overall economy.
In a first aspect, an embodiment of the present invention provides an energy management method for an optical storage power generation system supporting dual-mode operation, where the optical storage power generation system includes a photovoltaic power supply, an energy storage system, and a local load, and the method includes:
step S1, acquiring the power of the photovoltaic power supply, the energy storage system and the local load;
step S2, if the power of the local load is judged to exceed a preset threshold value, the energy storage system is controlled to enter a local transmitting self-balancing mode, and the power difference between the local load and the photovoltaic power supply is used as a power reference value of the energy storage system; if the power of the local load is judged not to exceed a preset threshold value, controlling the energy storage system to enter a feeder network photovoltaic power fluctuation stabilizing mode, and determining a fluctuation component in the power of the photovoltaic power supply based on a moving average filtering algorithm so as to take the fluctuation component as a power reference value of the energy storage system;
and step S3, the power reference value is used as a set value, the actually measured energy storage output power is used as a feedback value, a reference current is determined based on the PID controller, and the modulation voltage of the energy storage system three-phase inverter is determined based on the reference current.
Preferably, the photovoltaic power supply is a single-stage photovoltaic power supply, and the single-stage photovoltaic power supply operates in a Maximum Power Point Tracking (MPPT) mode.
Preferably, the step S1 specifically includes:
collecting output voltage and output current information of the photovoltaic power supply, the energy storage system and the local load to determine output power of the photovoltaic power supply, the energy storage system and the local load and determine a power difference between the local load and the photovoltaic power supply.
Preferably, in step S2, the fluctuation component in the power of the photovoltaic power supply is:
in the above-mentioned formula, the compound has the following structure,is the fluctuation component of the output power of the photovoltaic power supply at the moment k, P PV (k) The photovoltaic power output power measured at the moment k, N is the number of sampling data in the sliding window, and N belongs to [1, N ∈]。
Preferably, in step S2, when the energy storage system enters the local self-balancing mode, if the SOC of the energy storage system is greater than the SOC max Or less than SOC min And judging that the energy storage system is in an overshoot state or an over-discharge state, and setting the power reference value of the energy storage system to 0.
Preferably, in step S2, when the energy storage system enters the feed network photovoltaic power fluctuation stabilizing mode, if the SOC of the energy storage system is greater than the SOC max Or less than SOC min And judging that the energy storage system is in an overshoot state or an over-discharge state, and setting the power reference value of the energy storage system to 0.
Preferably, the energy storage system SOC is:
in the above formula, SoC (k) is the energy storage system SOC at time k, E batt In order to have the capacity of energy storage,P batt is the output power of the energy storage system.
In a second aspect, an embodiment of the present invention provides an energy management system for a photovoltaic storage power generation system supporting dual-mode operation, including:
the acquisition module is used for acquiring the power of the photovoltaic power supply, the energy storage system and the local load;
the mode adjusting module is used for controlling the energy storage system to enter a local transmitting self-balancing mode if the power of the local load is judged to exceed a preset threshold value, and taking the power difference between the local load and the photovoltaic power supply as a power reference value of the energy storage system; if the power of the local load is judged not to exceed a preset threshold value, controlling the energy storage system to enter a feeder network photovoltaic power fluctuation stabilizing mode, and determining a fluctuation component in the power of the photovoltaic power supply based on a moving average filtering algorithm so as to take the fluctuation component as a power reference value of the energy storage system;
and the energy storage management module is used for determining a reference current based on the PID controller by taking the power reference value as a set value and taking the actually measured energy storage output power as a feedback value, and determining the modulation voltage of the energy storage system three-phase inverter based on the reference current.
In a third aspect, an embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the method for managing energy of a photovoltaic power generation system supporting dual-mode operation according to the embodiment of the first aspect of the present invention.
In a fourth aspect, embodiments of the present invention provide a non-transitory computer readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method for energy management of a photovoltaic power generation system supporting dual-mode operation according to embodiments of the first aspect of the present invention.
According to the method and the system for managing the energy of the optical storage power generation system supporting the dual-mode operation, provided by the embodiment of the invention, by judging the level of a local load in the optical storage power generation system, the energy storage system can work in a local generation self-balancing mode and a feeder network photovoltaic power fluctuation stabilizing mode selectively, and under the local generation self-balancing mode, the energy storage system can compensate the difference power after the action of photovoltaic power generation and the local load based on the energy storage and transfer capacity of the energy storage system, so that the local load does not need to absorb energy from a power grid; under the mode of feed network photovoltaic power fluctuation stabilization, the energy storage system can stabilize high-frequency fluctuation components in photovoltaic output power and limit the climbing rate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a topological structure diagram of a light storage power generation system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for managing energy of an optical storage power generation system supporting dual-mode operation according to an embodiment of the invention;
FIG. 3 is a local load curve according to an embodiment of the present invention;
FIG. 4 is a graph comparing photovoltaic output active power and grid-connected active power according to an embodiment of the invention;
FIG. 5 is a graph of energy storage output active power according to an embodiment of the invention;
fig. 6 is a schematic physical structure diagram according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone.
The terms "first" and "second" in the embodiments of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "comprise" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a system, product or apparatus that comprises a list of elements or components is not limited to only those elements or components but may alternatively include other elements or components not expressly listed or inherent to such product or apparatus. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The photovoltaic power generation has obvious fluctuation and uncertainty, and impact can be caused to a power grid after the photovoltaic power generation is incorporated into the power grid along with the enlargement of the scale, so that the safe and stable operation of the power grid is influenced. The energy storage has the function of storing or releasing a certain amount of electric energy, can store partial electric energy when the photovoltaic is in a power generation peak and the power consumption is in a valley, and releases the electric energy in the power generation valley and the power consumption peak, thereby achieving the purpose of peak clipping and valley filling. Considering the relatively expensive energy storage economic cost, a single peak clipping and valley filling operation mode cannot give full play to the energy storage value, and the utilization efficiency of the energy storage and the overall economy cannot be improved.
Therefore, the embodiment of the invention provides an energy management method for a photovoltaic storage power generation system supporting dual-mode operation, by judging the level of a local load in the photovoltaic storage power generation system, the energy storage system can selectively work in a local generation self-balancing mode and a feeder network photovoltaic power fluctuation stabilizing mode, and in the local generation self-balancing mode, the energy storage system can compensate the difference power after the action of photovoltaic power generation and the local load based on the energy storage and transfer capacity of the energy storage system, so that the local load does not need to absorb energy from a power grid; under the mode of feed net photovoltaic power fluctuation stabilization, the energy storage system can stabilize high-frequency fluctuation components in photovoltaic output power and limit the climbing rate. The following description and description will proceed with reference being made to various embodiments.
Fig. 1 and fig. 2 are energy management methods for a light storage power generation system supporting dual-mode operation, where the light storage power generation system includes a photovoltaic power supply, an energy storage system, a local load, and a public power grid, and the method includes:
step S1, acquiring the power of the photovoltaic power supply, the energy storage system and the local load;
in this embodiment, the photovoltaic power source includes a photovoltaic array, the energy storage system includes a storage battery, a three-phase inverter (DC/AC inverter), and an energy management system, and output voltages and output currents of the photovoltaic power source, the energy storage system, and the local load are collected to determine output powers of the photovoltaic power source, the energy storage system, and the local load, and to determine a power difference between the local load and the photovoltaic power source. The photovoltaic Power supply is a single-stage photovoltaic Power supply, and the single-stage photovoltaic Power supply works in an MPPT (Maximum Power Point Tracking) mode.
The measured photovoltaic power supply, the energy storage system and the local load output voltage information and the output current information can be transmitted to an energy management system of the optical storage power generation system through a low-bandwidth communication network, and the active difference is calculated in the energy management system.
Step S2, if the power of the local load is judged to exceed the preset threshold value P L_lim If so, controlling the energy storage system to enter a local sending self-balancing mode, and taking the power difference between the local load and the photovoltaic power supply as a power reference value of the energy storage system, namely taking the difference between the power of the local load and the photovoltaic output information as the power reference value of the energy storage system; if the power of the local load is judged not to exceed a preset threshold value P L_lim Controlling the energy storage system to enter a feeder network photovoltaic power fluctuation stabilizing mode, and determining a fluctuation component in the power of the photovoltaic power supply based on a moving average filtering algorithm so as to take the fluctuation component as a power reference value of the energy storage system;
wherein the fluctuating component in the power of the photovoltaic power supply is:
in the above formula, the first and second carbon atoms are,is the fluctuation component of the output power of the photovoltaic power supply at the moment k, P PV (k) The photovoltaic power output power measured at the moment k, N is the number of the sampling data in the sliding window, N belongs to [1, N ]]。
When the energy storage system enters a local transmitting self-balancing mode, if the SOC of the energy storage system is larger than the SOC max Or less than SOC min And judging that the energy storage system is in an overshoot state or an over-discharge state, and setting the power reference value of the energy storage system to 0.
When the energy storage system enters a feed network photovoltaic power fluctuation stabilizing mode, if the SOC of the energy storage system is greater than the SOC max Or less than SOC min And judging that the energy storage system is in an overshoot state or an over-discharge state, and setting the power reference value of the energy storage system to 0.
Wherein, the energy storage SOC of the energy storage system is:
in the above formula, SoC (k) is the energy storage system SOC, E at the moment k batt For energy storage capacity, P batt Is the output power of the energy storage system.
Step S3, the reference power value is used as a set value, the actually measured energy storage output power is used as a feedback value, and the reference current (I) is determined based on the PID controller dref ,I qref Given values for the d-axis and the q-axis of the current inner loop, respectively), the modulation voltage of the energy storage system three-phase inverter is determined based on the reference current.
Fig. 3 is a variation curve of a local load within 10min, fig. 4 is output active power of a photovoltaic power supply and grid-connected active power of a light storage combined power generation system, and fig. 5 is output active power of stored energy. As can be seen from the combination of FIGS. 3, 4 and 5, the local load is lower than the threshold P within 0-100 s L_lim At the moment, the energy storage system works in a feed network photovoltaic power fluctuation stabilizing mode, high-frequency components in output fluctuation power of the photovoltaic power supply are compensated, the photovoltaic power generation climbing rate is reduced, one part of photovoltaic output meets the consumption of local loads, and the residual power can be injected into the power distribution network after energy storage smoothing, so that the influence of photovoltaic output uncertainty on the power distribution network is effectively improved; in the range of 100s to 400s, the value threshold value P is increased along with the increase of the local load L_lim In the above, the energy storage system is switched to a local generation self-balancing mode, the active power injected into the power grid is balanced to 0 by the stored energy, the active difference between the photovoltaic and the local load is completely absorbed or provided by the stored energy, and the operation mode can realize the local spontaneous self-use purpose under the condition of high-level load; in 400 s-600 s, the local load is reduced to the threshold value P again L_lim In the following, the energy storage system is switched back to the "feed-net photovoltaic power fluctuation stabilizing mode" autonomously at this time. The embodiment results show that the energy management method for the optical storage power generation system supporting the dual-mode operation can adaptively switch the working mode according to the local load level, improve the influence of photovoltaic fluctuation power on the power distribution network through the cooperative operation of photovoltaic and energy storage, and improve the utilization efficiency of energy storage and the power utilization rateIt is good at nature.
The embodiment of the invention also provides an energy management system of a light storage power generation system supporting dual-mode operation, and based on the energy management method of the light storage power generation system supporting dual-mode operation in the embodiments, the energy management method comprises the following steps:
the acquisition module is used for acquiring the power of the photovoltaic power supply, the energy storage system and the local load;
the mode adjusting module is used for controlling the energy storage system to enter a local transmitting self-balancing mode if the power of the local load is judged to exceed a preset threshold value, and the power difference between the local load and the photovoltaic power supply is used as a power reference value of the energy storage system; if the power of the local load is judged not to exceed a preset threshold value, controlling the energy storage system to enter a feeder network photovoltaic power fluctuation stabilizing mode, and determining a fluctuation component in the power of the photovoltaic power supply based on a moving average filtering algorithm so as to take the fluctuation component as a power reference value of the energy storage system;
and the energy storage management module is used for determining a reference current based on a PID (proportion integration differentiation) controller by taking the power reference value as a set value and taking the actually measured energy storage output power as a feedback value, and determining the modulation voltage of the energy storage system three-phase inverter based on the reference current.
Based on the same concept, an embodiment of the present invention further provides an entity structure schematic diagram, as shown in fig. 6, the server may include: a processor (processor)810, a communication Interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication Interface 820 and the memory 830 communicate with each other via the communication bus 840. The processor 810 may invoke logic instructions in the memory 830 to perform the steps of the method for energy management of a photovoltaic storage and generation system that supports dual mode operation as described in the various embodiments above. Examples include:
step S1, acquiring the power of the photovoltaic power supply, the energy storage system and the local load;
step S2, if the power of the local load is judged to exceed a preset threshold value, the energy storage system is controlled to enter a local transmitting self-balancing mode, and the power difference between the local load and the photovoltaic power supply is used as a power reference value of the energy storage system; if the power of the local load is judged not to exceed a preset threshold value, controlling the energy storage system to enter a feeder network photovoltaic power fluctuation stabilizing mode, and determining a fluctuation component in the power of the photovoltaic power supply based on a moving average filtering algorithm so as to take the fluctuation component as a power reference value of the energy storage system;
and step S3, the power reference value is used as a set value, the actually measured energy storage output power is used as a feedback value, a reference current is determined based on the PID controller, and the modulation voltage of the energy storage system three-phase inverter is determined based on the reference current.
In addition, the logic instructions in the memory 830 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention or a part thereof which substantially contributes to the prior art may be embodied in the form of a software product, which 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) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Based on the same concept, embodiments of the present invention further provide a non-transitory computer-readable storage medium storing a computer program, where the computer program includes at least one code, and the at least one code is executable by a master control device to control the master control device to implement the steps of the method for energy management of a photovoltaic energy storage and generation system supporting dual-mode operation according to the embodiments. Examples include:
step S1, acquiring the power of the photovoltaic power supply, the energy storage system and the local load;
step S2, if the power of the local load is judged to exceed a preset threshold value, the energy storage system is controlled to enter a local transmitting self-balancing mode, and the power difference between the local load and the photovoltaic power supply is used as a power reference value of the energy storage system; if the power of the local load is judged not to exceed a preset threshold value, controlling the energy storage system to enter a feeder network photovoltaic power fluctuation stabilizing mode, determining a fluctuation component in the power of the photovoltaic power supply based on a moving average filtering algorithm, and taking the fluctuation component as a power reference value of the energy storage system;
and step S3, the power reference value is used as a set value, the actually measured energy storage output power is used as a feedback value, a reference current is determined based on the PID controller, and the modulation voltage of the energy storage system three-phase inverter is determined based on the reference current.
Based on the same technical concept, the embodiment of the present application further provides a computer program, which is executed by the main control device to implement the method embodiment.
The program may be stored in whole or in part on a storage medium packaged with the processor, or in part or in whole on a memory not packaged with the processor.
Based on the same technical concept, the embodiment of the present application further provides a processor, and the processor is configured to implement the above method embodiment. The processor may be a chip.
In summary, according to the method and system for managing energy of an optical storage power generation system supporting dual-mode operation provided by the embodiment of the present invention, by determining the level of a local load in the optical storage power generation system, the energy storage system can selectively operate in a local generation self-balancing mode and a feed network photovoltaic power fluctuation stabilizing mode, and in the local generation self-balancing mode, the energy storage system can compensate the difference power after the photovoltaic power generation and the local load act on the basis of the energy storage and transfer capabilities of the energy storage system, so that the local load does not need to absorb energy from a power grid; under the mode of feed net photovoltaic power fluctuation stabilization, the energy storage system can stabilize high-frequency fluctuation components in photovoltaic output power and limit the climbing rate.
The embodiments of the present invention can be combined arbitrarily to achieve different technical effects.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedures or functions described in accordance with the present application are generated, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid state disk), among others.
One of ordinary skill in the art will appreciate that all or part of the processes in the methods of the above embodiments may be implemented by hardware related to instructions of a computer program, which may be stored in a computer-readable storage medium, and when executed, may include the processes of the above method embodiments. And the aforementioned storage medium includes: various media capable of storing program codes, such as ROM or RAM, magnetic or optical disks, etc.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for energy management of a photovoltaic power generation system supporting dual mode operation, the photovoltaic power generation system comprising a photovoltaic power source, an energy storage system and a local load, the method comprising:
step S1, acquiring the power of the photovoltaic power supply, the energy storage system and the local load;
step S2, if the power of the local load is judged to exceed a preset threshold value, the energy storage system is controlled to enter a local transmitting self-balancing mode, and the power difference between the local load and the photovoltaic power supply is used as a power reference value of the energy storage system; if the power of the local load is judged not to exceed a preset threshold value, controlling the energy storage system to enter a feeder network photovoltaic power fluctuation stabilizing mode, determining a fluctuation component in the power of the photovoltaic power supply based on a moving average filtering algorithm, and taking the fluctuation component as a power reference value of the energy storage system;
and step S3, the power reference value is used as a set value, the actually measured energy storage output power is used as a feedback value, a reference current is determined based on the PID controller, and the modulation voltage of the energy storage system three-phase inverter is determined based on the reference current.
2. The method according to claim 1, wherein the photovoltaic power supply is a single-stage photovoltaic power supply, and the single-stage photovoltaic power supply operates in a Maximum Power Point Tracking (MPPT) mode.
3. The method for energy management of an optical storage and power generation system supporting dual-mode operation according to claim 1, wherein the step S1 specifically includes:
collecting output voltage and output current information of the photovoltaic power supply, the energy storage system and the local load to determine output power of the photovoltaic power supply, the energy storage system and the local load and determine a power difference between the local load and the photovoltaic power supply.
4. The energy management method for an optical storage power generation system supporting dual-mode operation according to claim 1, wherein in the step S2, the fluctuation component in the output power of the photovoltaic power supply is:
in the above formula, the first and second carbon atoms are,is the fluctuation component of the output power of the photovoltaic power supply at the moment k, P PV (k) The output power of the photovoltaic power supply measured at the moment k, N is the number of the sampling data in the sliding window, and N belongs to [1, N ∈]。
5. The energy management method of the optical storage power generation system supporting dual-mode operation according to claim 1, wherein in step S2, when the energy storage system enters a local self-balancing mode for generation, if the SOC of the energy storage system is greater than the SOC of the energy storage system max Or less than SOC min And judging that the energy storage system is in an overshoot state or an over-discharge state, and setting the power reference value of the energy storage system to 0.
6. The energy management method for an optical storage power generation system supporting dual-mode operation according to claim 1, wherein in step S2, when the energy storage system enters a feed-grid photovoltaic power fluctuation stabilizing mode, if the SOC of the energy storage system is greater than the SOC max Or less than SOC min Then judge what isAnd when the energy storage system is in an overshoot state or an over-discharge state, setting the power reference value of the energy storage system to 0.
7. The energy management method of the optical storage power generation system supporting dual-mode operation according to claim 5 or 6, wherein the measurement method of the energy storage system SOC is as follows:
in the above formula, SoC (k) is the energy storage system SOC at time k, E batt For energy storage capacity, P batt Is the output power of the energy storage system.
8. An optical storage power generation system energy management system supporting dual mode operation, comprising:
the acquisition module is used for acquiring the power of the photovoltaic power supply, the energy storage system and the local load;
the mode adjusting module is used for controlling the energy storage system to enter a local transmitting self-balancing mode if the power of the local load is judged to exceed a preset threshold value, and the power difference between the local load and the photovoltaic power supply is used as a power reference value of the energy storage system; if the power of the local load is judged not to exceed a preset threshold value, controlling the energy storage system to enter a feeder network photovoltaic power fluctuation stabilizing mode, determining a fluctuation component in the power of the photovoltaic power supply based on a moving average filtering algorithm, and taking the fluctuation component as a power reference value of the energy storage system;
and the energy storage management module is used for determining a reference current based on a PID (proportion integration differentiation) controller by taking the power reference value as a set value and taking the actually measured energy storage output power as a feedback value, and determining the modulation voltage of the energy storage system three-phase inverter based on the reference current.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the method for energy management of a photovoltaic power generation system supporting dual mode operation according to any one of claims 1 to 7.
10. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the steps of the method for energy management of a photovoltaic energy storage and generation system supporting dual mode operation according to any one of claims 1 to 7.
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