Station service power-incorporating generation-to-storage switching control method and system for energy storage system

Abstract

Disclosed in the present invention are a station service power-incorporating generation-to-storage switching control method and system for an energy storage system, comprising: connecting an energy storage system power generator to a power grid to generate power, and incorporating station service power into a charging-storage power generation process; on the basis of a received scheduling instruction, carrying out a conversion between a stored-energy power generation state and an energy-consuming charging state; and, by means of the coordination between a station service power supply mode switch and the generated power of the energy storage system power generator, adjusting the charging-storage power generation process in a full range. The present invention increases the frequency modulation adjustment power and range of energy storage systems.

Description

A method and system for controlling power generation to power storage switching in a power storage system containing power for plant use Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a method and system for controlling switching from power generation to power storage in a power storage system including power plant power. Background Art

[0002] As a crucial component of the power system, energy storage systems undertake critical tasks such as balancing power generation and demand, improving energy efficiency, and promoting the integration of renewable energy. As a flexible regulatory resource, energy storage systems can respond to the grid's frequency regulation needs by storing and releasing energy. To achieve these functions, energy storage systems must charge and discharge according to the grid's real-time operating status to maintain grid stability and reliability. During this process, the energy storage system's plant power consumption (i.e., the power required for the storage facility's own operation) is essential for ensuring its normal operation.

[0003] In existing technologies, energy storage systems typically use two sources of plant power: local power and grid power (directly from the external grid). However, during the power generation to storage transition, existing technologies fail to consider optimized plant power management and switching mechanisms. This results in the plant power source not participating in the energy storage system's power generation to storage transition, undermining the regulation potential of both the plant power and the energy storage system, and reducing the energy storage system's ability to support grid frequency regulation. Summary of the Invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0005] In view of the above existing problems, the present invention is proposed.

[0006] Therefore, the present invention provides a method and system for controlling power generation to power storage switching in a power storage system including plant power, so as to solve the problem of reduced support capability of the energy storage system for grid frequency regulation control.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] In a first aspect, the present invention provides a method for controlling switching from power generation to power storage in a power storage system including power plant power, comprising:

[0009] The energy storage system generator is connected to the grid to generate electricity, incorporating the factory electricity into the charging and storage power generation process;

[0010] According to the received dispatch instructions, the energy storage power generation state and the energy consumption charging state are switched;

[0011] By switching the factory power supply mode and coordinating the power generation of the energy storage system generator, full-range regulation of the charging, storage and power generation process can be achieved.

[0012] As a preferred solution of the power generation to storage switching control method of the power storage system including power plant of the present invention, wherein:

[0013] The energy storage and power generation state includes:

[0014] The generator power is controlled according to the system discharge power issued by the dispatcher.

[0015] As a preferred solution of the power generation to storage switching control method of the power storage system including power plant of the present invention, wherein:

[0016] The energy consumption charging state includes:

[0017] The power of the motor and generator is controlled according to the system charging power issued by the dispatcher.

[0018] As a preferred solution of the power generation to storage switching control method of the power storage system including power plant of the present invention, wherein:

[0019] The energy storage power generation state also includes the energy storage power generation power of the system according to the dispatch. The energy storage system expansion generator power generation power control rule is expressed as:

[0020] Among them, P g is the power generated by the expansion generator, P a is the power load power of the plant, P f The system discharge power issued by the dispatcher.

[0021] As a preferred solution of the power generation to storage switching control method of the power storage system including power plant of the present invention, wherein:

[0022] The conversion between the energy storage and power generation state and the energy consumption and charging state includes:

[0023] When receiving the instruction to switch from power generation state to charging state, the generator power generation power P g Less than the factory power load power P a When , the system switches to energy consumption charging state:

[0024] As a preferred solution of the power generation to storage switching control method of the power storage system including power plant of the present invention, wherein:

[0025] The energy consumption and charging state also includes the energy storage system generator power control rule expressed as follows:

[0026] Among them, P s The system charging power issued by the dispatcher.

[0027] As a preferred solution of the power generation to storage switching control method of the power storage system including power plant of the present invention, wherein:

[0028] The auxiliary power supply mode switching, including the motor load power control rule, is expressed as follows:

[0029] Among them, P m is the motor load power.

[0030] In a second aspect, the present invention provides a power generation to storage switching control system for a power plant energy storage system, comprising:

[0031] In the power generation module, the generator of the energy storage system is connected to the power grid to generate electricity, and the factory power is included in the charging, storage and power generation process;

[0032] The scheduling module switches between the energy storage and power generation state and the energy consumption and charging state according to the received scheduling instructions;

[0033] The coordination module achieves full-range regulation of the charging, storage and power generation process by switching the factory power supply mode and coordinating the power generation of the energy storage system generator.

[0034] In a third aspect, the present invention provides a computing device, comprising:

[0035] Memory, used to store programs;

[0036] A processor is used to execute the computer-executable instructions, which, when executed by the processor, implement the steps of the power generation to storage switching control method of the power storage system containing plant power.

[0037] In a fourth aspect, the present invention provides a computer-readable storage medium, comprising: when the program is executed by a processor, the steps of implementing the method for controlling switching from power generation to power storage in a power storage system including plant power are implemented.

[0038] The beneficial effects of the present invention are: 1) Incorporating factory electricity into the energy storage and power generation process, improving the frequency regulation power and range of the energy storage system.

[0039] 2) By switching the factory power supply mode and coordinating the power generation of the energy storage system generator, full-range regulation of the charging, storage and power generation process is achieved. Compared with traditional methods, the regulation range is doubled, and the energy storage system's support for grid frequency control is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0041] FIG1 is a schematic diagram of a basic flow chart of a method for controlling switching from power generation to power storage in a power storage system including power plant use, provided by one embodiment of the present invention;

[0042] FIG2 is a flow chart of a switching method for controlling a power generation to power storage switching method of a power storage system including power for plant use, provided by one embodiment of the present invention;

[0043] FIG3 is a system diagram of a method for controlling switching from power generation to power storage in a power storage system including power plant consumption, provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0046] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0047] The present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0048] In the description of the present invention, it should be noted that the terms "upper, lower, inner, and outer" and other references to orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In this disclosure, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, removable, or integral connections. They may also refer to mechanical, electrical, or direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure.

[0050] Example 1

[0051] 1-3 , an embodiment of the present invention provides a method for controlling power generation to power storage switching in a power storage system including power plant consumption, including:

[0052] S1: The energy storage system generator is connected to the grid to generate electricity, incorporating the plant's electricity into the charging and storage power generation process;

[0053] S2: Switching between the energy storage and power generation state and the energy consumption and charging state according to the received dispatching instructions;

[0054] Furthermore, the energy storage power generation state: the energy storage system generator is connected to the grid to generate electricity, the motor is in hot standby state, and the power supply for the factory power load is supplied by the energy storage system generator.

[0055] Furthermore, the energy storage power generation status includes:

[0056] The generator power is controlled according to the system discharge power issued by the dispatcher.

[0057] Energy consumption and charging status include:

[0058] The power of the motor and generator is controlled according to the system charging power issued by the dispatcher.

[0059] Furthermore, the method for controlling the energy storage power generation is as follows: according to the system energy storage power generation issued by the dispatcher, the power generation of the energy storage system expansion generator is controlled as follows:

[0060] Among them, P g is the power generated by the expansion generator, P a is the power load power of the plant, Pf The system discharge power issued by the dispatcher.

[0061] Furthermore, the switching method is as follows: upon receiving the “command to switch from power generation to charging”, the power generation of the energy storage system generator is reduced, and the system switches to the energy consumption charging state when the following conditions are met: P g <P a

[0062] When P g When ≤0, the factory power load power supply is switched to the grid and the motor is started.

[0063] Methods for controlling energy consumption and charging power:

[0064] According to the system energy consumption charging power issued by the dispatcher, the energy storage system generator power generation power is controlled as follows:

[0065] Among them, P s The system charging power issued by the dispatcher.

[0066] S3: By switching the factory power supply mode and coordinating the power generation of the energy storage system generator, full-range regulation of the charging, storage and power generation process can be achieved.

[0067] Furthermore, when the power supply of the factory power load is switched to the grid power supply, the motor is started and runs.

[0068] The motor load power is controlled as follows:

[0069] Among them, P m is the motor load power.

[0070] Furthermore, the energy storage system power generation to storage switching control process, as shown in Figure 2, includes the following steps:

[0071] Enter the energy storage power generation state and judge the system discharge power P issued by the dispatcher f Is it greater than 0?

[0072] If P f >0, the generator power is expressed as: P g =P f +P a ;

[0073] If P f =0, then the generator power is expressed as: P g =P a ;

[0074] Receive the "switch from power generation to charging" instruction, when P g <P a, then enter the energy consumption charging state;

[0075] Determine the system charging power P issued by the dispatcher s Is it greater than the factory power load power P a ;

[0076] If the system charging power P s Greater than the factory power load power P a , then the generator power is expressed as: P g =0, the factory power load power supply is switched to the grid power supply, and the motor load power is expressed as: P m =P s -P a ;

[0077] If the system charging power P s Less than the factory power load power P a , then the generator power is expressed as: P g =|P f +P a |, the power supply for the plant load is switched to a combined power supply from the energy storage system generator and the grid. The motor load power is expressed as: P m =0;

[0078] This embodiment also provides a power generation to storage switching control system for a power storage system including a plant power supply, including:

[0079] In the power generation module, the generator of the energy storage system is connected to the power grid to generate electricity, and the factory power is included in the charging, storage and power generation process;

[0080] The scheduling module switches between the energy storage and power generation state and the energy consumption and charging state according to the received scheduling instructions;

[0081] The coordination module achieves full-range regulation of the charging, storage and power generation process by switching the factory power supply mode and coordinating the power generation of the energy storage system generator.

[0082] Furthermore, as shown in FIG3 , at least one electric motor is configured to operate in a charging mode, wherein the electric motor is of an adjustable power type and is capable of adjusting power within a full range from zero to its rated power;

[0083] Furthermore, at least one generator is configured to operate in a discharge mode, characterized in that the generator is of an adjustable power type and can adjust the power within a full range from zero to its rated power;

[0084] Furthermore, the control unit is configured to adjust the power output of the motor and the generator and switch the factory power supply according to the grid demand and the operating status of the energy storage system.

[0085] Furthermore, the motor is of variable frequency speed regulation type, and full range power regulation is achieved through variable frequency speed regulation.

[0086] Furthermore, the factory power load power supply can be supplied by the power grid alone or jointly by the energy storage system and the power grid, with a switch in between for disturbance-free switching.

[0087] Furthermore, a switching switch is provided between the grid interface and the generator outlet for disturbance-free switching between grid-alone power supply and energy storage system-grid combined power supply to supply the plant power load of the energy storage system.

[0088] Furthermore, the energy storage system generator and the plant power load are equipped with synchronization devices.

[0089] Furthermore, the energy storage system receives dispatching instructions from the energy management system or the grid operator, and controls the energy storage device to perform charging and discharging switching operations according to the received dispatching instructions.

[0090] Furthermore, it also includes:

[0091] Memory, used to store programs;

[0092] A processor is used to load the program to execute the power generation to storage switching control method of the power storage system containing plant power.

[0093] This embodiment further provides a computer-readable storage medium storing a program. When the program is executed by a processor, the method for controlling switching from power generation to power storage in the power storage system including power consumption of the plant is implemented.

[0094] The storage medium proposed in this embodiment and the power generation to storage switching control method of the plant power storage system proposed in the above embodiment belong to the same inventive concept. For technical details not fully described in this embodiment, please refer to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0095] Through the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented with the help of software and necessary general-purpose hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a computer's floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods of various embodiments of the present invention.

[0096] Example 2

[0097] As an embodiment of the present invention, a method for controlling switching from power generation to power storage in a power storage system containing plant power is provided. In order to verify the beneficial effects of the present invention, a scientific demonstration is carried out through specific implementation methods and implementation effects.

[0098] The power load power P corresponding to a certain energy storage system a It is 10MW and is in the energy storage power generation state. At this time, the energy storage system generator is connected to the grid to generate electricity, the motor is in hot standby state, and the power supply for the factory power load is supplied by the energy storage system generator.

[0099] According to the system energy storage power generation power P issued by the dispatcher f , the power generation power P of the energy storage system generator g Take control:

[0100] (1) When the system discharge power P f When it is 0, the generator power is equal to the plant load power, that is: P g =P a =10MW;

[0101] (2) When the system discharge power P f When the power is 5MW, the generator, in addition to supplying the plant power load, must also meet the system discharge power P f , at this time, the generator power is: P g =P f +P a =5+10=15MW.

[0102] Upon receiving the “command to switch from discharge to charge”, the generator power of the energy storage system is reduced. When the generator power is less than the plant power load power, that is: Pg <P a , the system switches to energy consumption and charging state. According to the system energy consumption and charging power P issued by the dispatcher s , the power generation power P of the energy storage system generator g And motor load power P m Take control:

[0103] (1) When the system charging power P s When it is 15MW, it is greater than the factory power load power P a , at this time, the generator power P g =0, the power supply of the auxiliary power load is switched to the grid, the auxiliary power load consumes 10MW, the motor is started and the motor load power is: P m =P s -P a =15-10=5MW;

[0104] (2) When the system charging power P s When it is 10MW, it is exactly equal to the factory power load power P a At this time, the motor and generator are stopped and the factory load power supply is supplied by the grid alone;

[0105] (3) When the system charging power P s When it is 5MW, it is less than the factory power load power P a At this time, the motor is stopped and the power supply for the plant load is jointly supplied by the energy storage system and the grid. The grid power supply is equal to the system charging power P issued by the dispatcher. s The remaining power is supplemented by the energy storage system generator to the plant power load power, and the generator power is controlled to be: P g =|P s -P a |=|5-10|=5MW.

[0106] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for controlling the switching from power generation to power storage in a power storage system containing power for plant use, characterized in that: include: The energy storage system generator is connected to the grid to generate electricity, incorporating the factory electricity into the charging and storage power generation process; According to the dispatch instructions received, the energy storage power generation state and the energy consumption charging state are switched; By switching the factory power supply mode and coordinating the power generation of the energy storage system generator, full-range regulation of the charging, storage and power generation process can be achieved.

2. The method for controlling the switching from power generation to power storage of a power storage system including power supply to a power plant as claimed in claim 1, characterized in that: The energy storage and power generation state includes: The generator power is controlled according to the system discharge power issued by the dispatcher.

3. The method for controlling switching from power generation to power storage in a power storage system including power supply to a power plant as claimed in claim 1 or 2, characterized in that: The energy consumption charging state includes: The power of the motor and generator is controlled according to the system charging power issued by the dispatcher.

4. The method for controlling the switching from power generation to power storage of a power storage system including power supply to a power plant as claimed in claim 3, characterized in that: The energy storage power generation state also includes the energy storage power generation power of the system according to the dispatch. The energy storage system expansion generator power generation power control rule is expressed as: Among them, P g is the power generated by the expansion generator, P a is the power load power of the plant, P f The system discharge power issued by the dispatcher.

5. [Corrected 20.02.2025 according to Rule 26] The method for controlling the switching from power generation to power storage in a power storage system including power supply to a power plant as claimed in claim 4, characterized in that: The conversion between the energy storage and power generation state and the energy consumption and charging state includes: When receiving the instruction to switch from the power generation state to the charging state, if the power generation power Pg of the expansion generator is less than the power load power Pa of the plant, the system switches to the energy consumption charging state.

6. The method for controlling switching from power generation to power storage in a power storage system including power for auxiliary power supply according to claim 5, characterized in that: The energy consumption and charging state also includes the energy storage system generator power control rule expressed as follows: Among them, P s The system charging power issued by the dispatcher.

7. The method for controlling the switching from power generation to power storage of a power storage system including power supply to a power plant as claimed in claim 6, characterized in that: The auxiliary power supply mode switching, including the motor load power control rule, is expressed as follows: Among them, P m is the motor load power.

8. A power generation to storage switching control system for a power storage system including a plant power supply according to claim 1, characterized in that: In the power generation module, the generator of the energy storage system is connected to the power grid to generate electricity, and the factory power is included in the charging, storage and power generation process; The scheduling module switches between the energy storage and power generation state and the energy consumption and charging state according to the received scheduling instructions; The coordination module achieves full-range regulation of the charging, storage and power generation process by switching the factory power supply mode and coordinating the power generation of the energy storage system generator.

9. An electronic device, characterized in that: include: Memory, used to store programs; A processor is used to load the program to execute the steps of the power generation to storage switching control method of the power storage system containing plant power as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a program, characterized in that: When the program is executed by the processor, the steps of the power generation to storage switching control method of the power storage system containing plant power as described in any one of claims 1 to 7 are implemented.

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